mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-09 23:46:44 +07:00
9b3efc0133
Recently, Wang Chen submitted a patch
(d30f53aeb3
) to move a call to netif_rx(skb)
after a subsequent reference to skb, because netif_rx may call kfree_skb on
its argument. netif_rx_ni calls netif_rx, so the same problem occurs in
the files below.
I have left the updating of dev->last_rx after the calls to netif_rx_ni
because it seems time dependent, but moved the other field updates before.
This was found using the following semantic match.
(http://www.emn.fr/x-info/coccinelle/)
// <smpl>
@@
expression skb, e,e1;
@@
(
netif_rx(skb);
|
netif_rx_ni(skb);
)
... when != skb = e
(
skb = e1
|
* skb
)
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>
3063 lines
81 KiB
C
3063 lines
81 KiB
C
/*
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|
* CTC / ESCON network driver
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*
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* Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
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* Fixes by : Jochen Röhrig (roehrig@de.ibm.com)
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* Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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Peter Tiedemann (ptiedem@de.ibm.com)
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* Driver Model stuff by : Cornelia Huck <cornelia.huck@de.ibm.com>
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*
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* Documentation used:
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* - Principles of Operation (IBM doc#: SA22-7201-06)
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* - Common IO/-Device Commands and Self Description (IBM doc#: SA22-7204-02)
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* - Common IO/-Device Commands and Self Description (IBM doc#: SN22-5535)
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* - ESCON Channel-to-Channel Adapter (IBM doc#: SA22-7203-00)
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* - ESCON I/O Interface (IBM doc#: SA22-7202-029
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*
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* and the source of the original CTC driver by:
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* Dieter Wellerdiek (wel@de.ibm.com)
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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* Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
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* Jochen Röhrig (roehrig@de.ibm.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
|
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#undef DEBUG
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/timer.h>
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#include <linux/bitops.h>
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#include <linux/signal.h>
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#include <linux/string.h>
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#include <linux/ip.h>
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#include <linux/if_arp.h>
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#include <linux/tcp.h>
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#include <linux/skbuff.h>
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#include <linux/ctype.h>
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#include <net/dst.h>
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#include <asm/io.h>
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#include <asm/ccwdev.h>
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#include <asm/ccwgroup.h>
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#include <asm/uaccess.h>
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#include <asm/idals.h>
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#include "fsm.h"
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#include "cu3088.h"
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#include "ctcdbug.h"
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#include "ctcmain.h"
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MODULE_AUTHOR("(C) 2000 IBM Corp. by Fritz Elfert (felfert@millenux.com)");
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MODULE_DESCRIPTION("Linux for S/390 CTC/Escon Driver");
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MODULE_LICENSE("GPL");
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/**
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* States of the interface statemachine.
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*/
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enum dev_states {
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DEV_STATE_STOPPED,
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DEV_STATE_STARTWAIT_RXTX,
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DEV_STATE_STARTWAIT_RX,
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DEV_STATE_STARTWAIT_TX,
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DEV_STATE_STOPWAIT_RXTX,
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DEV_STATE_STOPWAIT_RX,
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DEV_STATE_STOPWAIT_TX,
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DEV_STATE_RUNNING,
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/**
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* MUST be always the last element!!
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*/
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CTC_NR_DEV_STATES
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};
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static const char *dev_state_names[] = {
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"Stopped",
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"StartWait RXTX",
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"StartWait RX",
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"StartWait TX",
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"StopWait RXTX",
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"StopWait RX",
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"StopWait TX",
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"Running",
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};
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/**
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* Events of the interface statemachine.
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*/
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enum dev_events {
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DEV_EVENT_START,
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DEV_EVENT_STOP,
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DEV_EVENT_RXUP,
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DEV_EVENT_TXUP,
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DEV_EVENT_RXDOWN,
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DEV_EVENT_TXDOWN,
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DEV_EVENT_RESTART,
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/**
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* MUST be always the last element!!
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*/
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CTC_NR_DEV_EVENTS
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};
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static const char *dev_event_names[] = {
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"Start",
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"Stop",
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"RX up",
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"TX up",
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"RX down",
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"TX down",
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"Restart",
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};
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/**
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* Events of the channel statemachine
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*/
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enum ch_events {
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/**
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* Events, representing return code of
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* I/O operations (ccw_device_start, ccw_device_halt et al.)
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*/
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CH_EVENT_IO_SUCCESS,
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CH_EVENT_IO_EBUSY,
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CH_EVENT_IO_ENODEV,
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CH_EVENT_IO_EIO,
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CH_EVENT_IO_UNKNOWN,
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CH_EVENT_ATTNBUSY,
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CH_EVENT_ATTN,
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CH_EVENT_BUSY,
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/**
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* Events, representing unit-check
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*/
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CH_EVENT_UC_RCRESET,
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CH_EVENT_UC_RSRESET,
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CH_EVENT_UC_TXTIMEOUT,
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CH_EVENT_UC_TXPARITY,
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CH_EVENT_UC_HWFAIL,
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CH_EVENT_UC_RXPARITY,
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CH_EVENT_UC_ZERO,
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CH_EVENT_UC_UNKNOWN,
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/**
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* Events, representing subchannel-check
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*/
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CH_EVENT_SC_UNKNOWN,
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/**
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* Events, representing machine checks
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*/
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CH_EVENT_MC_FAIL,
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CH_EVENT_MC_GOOD,
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/**
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* Event, representing normal IRQ
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*/
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CH_EVENT_IRQ,
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CH_EVENT_FINSTAT,
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|
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/**
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* Event, representing timer expiry.
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*/
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CH_EVENT_TIMER,
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/**
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* Events, representing commands from upper levels.
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*/
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CH_EVENT_START,
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CH_EVENT_STOP,
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/**
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* MUST be always the last element!!
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*/
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NR_CH_EVENTS,
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};
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/**
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* States of the channel statemachine.
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*/
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enum ch_states {
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/**
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* Channel not assigned to any device,
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* initial state, direction invalid
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*/
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CH_STATE_IDLE,
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/**
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* Channel assigned but not operating
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*/
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CH_STATE_STOPPED,
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CH_STATE_STARTWAIT,
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CH_STATE_STARTRETRY,
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CH_STATE_SETUPWAIT,
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CH_STATE_RXINIT,
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CH_STATE_TXINIT,
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CH_STATE_RX,
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CH_STATE_TX,
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CH_STATE_RXIDLE,
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CH_STATE_TXIDLE,
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CH_STATE_RXERR,
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CH_STATE_TXERR,
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CH_STATE_TERM,
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CH_STATE_DTERM,
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CH_STATE_NOTOP,
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/**
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* MUST be always the last element!!
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*/
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NR_CH_STATES,
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};
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static int loglevel = CTC_LOGLEVEL_DEFAULT;
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/**
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* Linked list of all detected channels.
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*/
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static struct channel *channels = NULL;
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/**
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* Print Banner.
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*/
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static void
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print_banner(void)
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{
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static int printed = 0;
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if (printed)
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return;
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printk(KERN_INFO "CTC driver initialized\n");
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printed = 1;
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}
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/**
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* Return type of a detected device.
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*/
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static enum channel_types
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get_channel_type(struct ccw_device_id *id)
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{
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enum channel_types type = (enum channel_types) id->driver_info;
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if (type == channel_type_ficon)
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type = channel_type_escon;
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return type;
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}
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static const char *ch_event_names[] = {
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"ccw_device success",
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"ccw_device busy",
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"ccw_device enodev",
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"ccw_device ioerr",
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"ccw_device unknown",
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"Status ATTN & BUSY",
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"Status ATTN",
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"Status BUSY",
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"Unit check remote reset",
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"Unit check remote system reset",
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"Unit check TX timeout",
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"Unit check TX parity",
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"Unit check Hardware failure",
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"Unit check RX parity",
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"Unit check ZERO",
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"Unit check Unknown",
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"SubChannel check Unknown",
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"Machine check failure",
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"Machine check operational",
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"IRQ normal",
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"IRQ final",
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"Timer",
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"Start",
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"Stop",
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};
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static const char *ch_state_names[] = {
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"Idle",
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"Stopped",
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"StartWait",
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"StartRetry",
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"SetupWait",
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"RX init",
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"TX init",
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"RX",
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"TX",
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"RX idle",
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"TX idle",
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"RX error",
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"TX error",
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"Terminating",
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"Restarting",
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"Not operational",
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};
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#ifdef DEBUG
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/**
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* Dump header and first 16 bytes of an sk_buff for debugging purposes.
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*
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* @param skb The sk_buff to dump.
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* @param offset Offset relative to skb-data, where to start the dump.
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*/
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static void
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ctc_dump_skb(struct sk_buff *skb, int offset)
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{
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unsigned char *p = skb->data;
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__u16 bl;
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struct ll_header *header;
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int i;
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if (!(loglevel & CTC_LOGLEVEL_DEBUG))
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return;
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p += offset;
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bl = *((__u16 *) p);
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p += 2;
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header = (struct ll_header *) p;
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p -= 2;
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printk(KERN_DEBUG "dump:\n");
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printk(KERN_DEBUG "blocklen=%d %04x\n", bl, bl);
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printk(KERN_DEBUG "h->length=%d %04x\n", header->length,
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header->length);
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printk(KERN_DEBUG "h->type=%04x\n", header->type);
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printk(KERN_DEBUG "h->unused=%04x\n", header->unused);
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if (bl > 16)
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bl = 16;
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printk(KERN_DEBUG "data: ");
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for (i = 0; i < bl; i++)
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printk("%02x%s", *p++, (i % 16) ? " " : "\n<7>");
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printk("\n");
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}
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#else
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static inline void
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ctc_dump_skb(struct sk_buff *skb, int offset)
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{
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}
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#endif
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/**
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* Unpack a just received skb and hand it over to
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* upper layers.
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*
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* @param ch The channel where this skb has been received.
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* @param pskb The received skb.
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*/
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static void
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ctc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
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{
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struct net_device *dev = ch->netdev;
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struct ctc_priv *privptr = (struct ctc_priv *) dev->priv;
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__u16 len = *((__u16 *) pskb->data);
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DBF_TEXT(trace, 4, __FUNCTION__);
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skb_put(pskb, 2 + LL_HEADER_LENGTH);
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skb_pull(pskb, 2);
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pskb->dev = dev;
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pskb->ip_summed = CHECKSUM_UNNECESSARY;
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while (len > 0) {
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struct sk_buff *skb;
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struct ll_header *header = (struct ll_header *) pskb->data;
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skb_pull(pskb, LL_HEADER_LENGTH);
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if ((ch->protocol == CTC_PROTO_S390) &&
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(header->type != ETH_P_IP)) {
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#ifndef DEBUG
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if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
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#endif
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/**
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* Check packet type only if we stick strictly
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* to S/390's protocol of OS390. This only
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* supports IP. Otherwise allow any packet
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* type.
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*/
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ctc_pr_warn(
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"%s Illegal packet type 0x%04x received, dropping\n",
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dev->name, header->type);
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ch->logflags |= LOG_FLAG_ILLEGALPKT;
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#ifndef DEBUG
|
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}
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#endif
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#ifdef DEBUG
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ctc_dump_skb(pskb, -6);
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#endif
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privptr->stats.rx_dropped++;
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privptr->stats.rx_frame_errors++;
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return;
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}
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pskb->protocol = ntohs(header->type);
|
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if (header->length <= LL_HEADER_LENGTH) {
|
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#ifndef DEBUG
|
|
if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
|
|
#endif
|
|
ctc_pr_warn(
|
|
"%s Illegal packet size %d "
|
|
"received (MTU=%d blocklen=%d), "
|
|
"dropping\n", dev->name, header->length,
|
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dev->mtu, len);
|
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ch->logflags |= LOG_FLAG_ILLEGALSIZE;
|
|
#ifndef DEBUG
|
|
}
|
|
#endif
|
|
#ifdef DEBUG
|
|
ctc_dump_skb(pskb, -6);
|
|
#endif
|
|
privptr->stats.rx_dropped++;
|
|
privptr->stats.rx_length_errors++;
|
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return;
|
|
}
|
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header->length -= LL_HEADER_LENGTH;
|
|
len -= LL_HEADER_LENGTH;
|
|
if ((header->length > skb_tailroom(pskb)) ||
|
|
(header->length > len)) {
|
|
#ifndef DEBUG
|
|
if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
|
|
#endif
|
|
ctc_pr_warn(
|
|
"%s Illegal packet size %d "
|
|
"(beyond the end of received data), "
|
|
"dropping\n", dev->name, header->length);
|
|
ch->logflags |= LOG_FLAG_OVERRUN;
|
|
#ifndef DEBUG
|
|
}
|
|
#endif
|
|
#ifdef DEBUG
|
|
ctc_dump_skb(pskb, -6);
|
|
#endif
|
|
privptr->stats.rx_dropped++;
|
|
privptr->stats.rx_length_errors++;
|
|
return;
|
|
}
|
|
skb_put(pskb, header->length);
|
|
skb_reset_mac_header(pskb);
|
|
len -= header->length;
|
|
skb = dev_alloc_skb(pskb->len);
|
|
if (!skb) {
|
|
#ifndef DEBUG
|
|
if (!(ch->logflags & LOG_FLAG_NOMEM)) {
|
|
#endif
|
|
ctc_pr_warn(
|
|
"%s Out of memory in ctc_unpack_skb\n",
|
|
dev->name);
|
|
ch->logflags |= LOG_FLAG_NOMEM;
|
|
#ifndef DEBUG
|
|
}
|
|
#endif
|
|
privptr->stats.rx_dropped++;
|
|
return;
|
|
}
|
|
skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
|
|
pskb->len);
|
|
skb_reset_mac_header(skb);
|
|
skb->dev = pskb->dev;
|
|
skb->protocol = pskb->protocol;
|
|
pskb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
/**
|
|
* reset logflags
|
|
*/
|
|
ch->logflags = 0;
|
|
privptr->stats.rx_packets++;
|
|
privptr->stats.rx_bytes += skb->len;
|
|
netif_rx_ni(skb);
|
|
dev->last_rx = jiffies;
|
|
if (len > 0) {
|
|
skb_pull(pskb, header->length);
|
|
if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
|
|
#ifndef DEBUG
|
|
if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
|
|
#endif
|
|
ctc_pr_warn(
|
|
"%s Overrun in ctc_unpack_skb\n",
|
|
dev->name);
|
|
ch->logflags |= LOG_FLAG_OVERRUN;
|
|
#ifndef DEBUG
|
|
}
|
|
#endif
|
|
return;
|
|
}
|
|
skb_put(pskb, LL_HEADER_LENGTH);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check return code of a preceeding ccw_device call, halt_IO etc...
|
|
*
|
|
* @param ch The channel, the error belongs to.
|
|
* @param return_code The error code to inspect.
|
|
*/
|
|
static void
|
|
ccw_check_return_code(struct channel *ch, int return_code, char *msg)
|
|
{
|
|
DBF_TEXT(trace, 5, __FUNCTION__);
|
|
switch (return_code) {
|
|
case 0:
|
|
fsm_event(ch->fsm, CH_EVENT_IO_SUCCESS, ch);
|
|
break;
|
|
case -EBUSY:
|
|
ctc_pr_warn("%s (%s): Busy !\n", ch->id, msg);
|
|
fsm_event(ch->fsm, CH_EVENT_IO_EBUSY, ch);
|
|
break;
|
|
case -ENODEV:
|
|
ctc_pr_emerg("%s (%s): Invalid device called for IO\n",
|
|
ch->id, msg);
|
|
fsm_event(ch->fsm, CH_EVENT_IO_ENODEV, ch);
|
|
break;
|
|
case -EIO:
|
|
ctc_pr_emerg("%s (%s): Status pending... \n",
|
|
ch->id, msg);
|
|
fsm_event(ch->fsm, CH_EVENT_IO_EIO, ch);
|
|
break;
|
|
default:
|
|
ctc_pr_emerg("%s (%s): Unknown error in do_IO %04x\n",
|
|
ch->id, msg, return_code);
|
|
fsm_event(ch->fsm, CH_EVENT_IO_UNKNOWN, ch);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check sense of a unit check.
|
|
*
|
|
* @param ch The channel, the sense code belongs to.
|
|
* @param sense The sense code to inspect.
|
|
*/
|
|
static void
|
|
ccw_unit_check(struct channel *ch, unsigned char sense)
|
|
{
|
|
DBF_TEXT(trace, 5, __FUNCTION__);
|
|
if (sense & SNS0_INTERVENTION_REQ) {
|
|
if (sense & 0x01) {
|
|
ctc_pr_debug("%s: Interface disc. or Sel. reset "
|
|
"(remote)\n", ch->id);
|
|
fsm_event(ch->fsm, CH_EVENT_UC_RCRESET, ch);
|
|
} else {
|
|
ctc_pr_debug("%s: System reset (remote)\n", ch->id);
|
|
fsm_event(ch->fsm, CH_EVENT_UC_RSRESET, ch);
|
|
}
|
|
} else if (sense & SNS0_EQUIPMENT_CHECK) {
|
|
if (sense & SNS0_BUS_OUT_CHECK) {
|
|
ctc_pr_warn("%s: Hardware malfunction (remote)\n",
|
|
ch->id);
|
|
fsm_event(ch->fsm, CH_EVENT_UC_HWFAIL, ch);
|
|
} else {
|
|
ctc_pr_warn("%s: Read-data parity error (remote)\n",
|
|
ch->id);
|
|
fsm_event(ch->fsm, CH_EVENT_UC_RXPARITY, ch);
|
|
}
|
|
} else if (sense & SNS0_BUS_OUT_CHECK) {
|
|
if (sense & 0x04) {
|
|
ctc_pr_warn("%s: Data-streaming timeout)\n", ch->id);
|
|
fsm_event(ch->fsm, CH_EVENT_UC_TXTIMEOUT, ch);
|
|
} else {
|
|
ctc_pr_warn("%s: Data-transfer parity error\n", ch->id);
|
|
fsm_event(ch->fsm, CH_EVENT_UC_TXPARITY, ch);
|
|
}
|
|
} else if (sense & SNS0_CMD_REJECT) {
|
|
ctc_pr_warn("%s: Command reject\n", ch->id);
|
|
} else if (sense == 0) {
|
|
ctc_pr_debug("%s: Unit check ZERO\n", ch->id);
|
|
fsm_event(ch->fsm, CH_EVENT_UC_ZERO, ch);
|
|
} else {
|
|
ctc_pr_warn("%s: Unit Check with sense code: %02x\n",
|
|
ch->id, sense);
|
|
fsm_event(ch->fsm, CH_EVENT_UC_UNKNOWN, ch);
|
|
}
|
|
}
|
|
|
|
static void
|
|
ctc_purge_skb_queue(struct sk_buff_head *q)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
DBF_TEXT(trace, 5, __FUNCTION__);
|
|
|
|
while ((skb = skb_dequeue(q))) {
|
|
atomic_dec(&skb->users);
|
|
dev_kfree_skb_irq(skb);
|
|
}
|
|
}
|
|
|
|
static int
|
|
ctc_checkalloc_buffer(struct channel *ch, int warn)
|
|
{
|
|
DBF_TEXT(trace, 5, __FUNCTION__);
|
|
if ((ch->trans_skb == NULL) ||
|
|
(ch->flags & CHANNEL_FLAGS_BUFSIZE_CHANGED)) {
|
|
if (ch->trans_skb != NULL)
|
|
dev_kfree_skb(ch->trans_skb);
|
|
clear_normalized_cda(&ch->ccw[1]);
|
|
ch->trans_skb = __dev_alloc_skb(ch->max_bufsize,
|
|
GFP_ATOMIC | GFP_DMA);
|
|
if (ch->trans_skb == NULL) {
|
|
if (warn)
|
|
ctc_pr_warn(
|
|
"%s: Couldn't alloc %s trans_skb\n",
|
|
ch->id,
|
|
(CHANNEL_DIRECTION(ch->flags) == READ) ?
|
|
"RX" : "TX");
|
|
return -ENOMEM;
|
|
}
|
|
ch->ccw[1].count = ch->max_bufsize;
|
|
if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
|
|
dev_kfree_skb(ch->trans_skb);
|
|
ch->trans_skb = NULL;
|
|
if (warn)
|
|
ctc_pr_warn(
|
|
"%s: set_normalized_cda for %s "
|
|
"trans_skb failed, dropping packets\n",
|
|
ch->id,
|
|
(CHANNEL_DIRECTION(ch->flags) == READ) ?
|
|
"RX" : "TX");
|
|
return -ENOMEM;
|
|
}
|
|
ch->ccw[1].count = 0;
|
|
ch->trans_skb_data = ch->trans_skb->data;
|
|
ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Dummy NOP action for statemachines
|
|
*/
|
|
static void
|
|
fsm_action_nop(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
}
|
|
|
|
/**
|
|
* Actions for channel - statemachines.
|
|
*****************************************************************************/
|
|
|
|
/**
|
|
* Normal data has been send. Free the corresponding
|
|
* skb (it's in io_queue), reset dev->tbusy and
|
|
* revert to idle state.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_txdone(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
struct net_device *dev = ch->netdev;
|
|
struct ctc_priv *privptr = dev->priv;
|
|
struct sk_buff *skb;
|
|
int first = 1;
|
|
int i;
|
|
unsigned long duration;
|
|
struct timespec done_stamp = current_kernel_time();
|
|
|
|
DBF_TEXT(trace, 4, __FUNCTION__);
|
|
|
|
duration =
|
|
(done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
|
|
(done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
|
|
if (duration > ch->prof.tx_time)
|
|
ch->prof.tx_time = duration;
|
|
|
|
if (ch->irb->scsw.count != 0)
|
|
ctc_pr_debug("%s: TX not complete, remaining %d bytes\n",
|
|
dev->name, ch->irb->scsw.count);
|
|
fsm_deltimer(&ch->timer);
|
|
while ((skb = skb_dequeue(&ch->io_queue))) {
|
|
privptr->stats.tx_packets++;
|
|
privptr->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
|
|
if (first) {
|
|
privptr->stats.tx_bytes += 2;
|
|
first = 0;
|
|
}
|
|
atomic_dec(&skb->users);
|
|
dev_kfree_skb_irq(skb);
|
|
}
|
|
spin_lock(&ch->collect_lock);
|
|
clear_normalized_cda(&ch->ccw[4]);
|
|
if (ch->collect_len > 0) {
|
|
int rc;
|
|
|
|
if (ctc_checkalloc_buffer(ch, 1)) {
|
|
spin_unlock(&ch->collect_lock);
|
|
return;
|
|
}
|
|
ch->trans_skb->data = ch->trans_skb_data;
|
|
skb_reset_tail_pointer(ch->trans_skb);
|
|
ch->trans_skb->len = 0;
|
|
if (ch->prof.maxmulti < (ch->collect_len + 2))
|
|
ch->prof.maxmulti = ch->collect_len + 2;
|
|
if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
|
|
ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
|
|
*((__u16 *) skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
|
|
i = 0;
|
|
while ((skb = skb_dequeue(&ch->collect_queue))) {
|
|
skb_copy_from_linear_data(skb, skb_put(ch->trans_skb,
|
|
skb->len),
|
|
skb->len);
|
|
privptr->stats.tx_packets++;
|
|
privptr->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
|
|
atomic_dec(&skb->users);
|
|
dev_kfree_skb_irq(skb);
|
|
i++;
|
|
}
|
|
ch->collect_len = 0;
|
|
spin_unlock(&ch->collect_lock);
|
|
ch->ccw[1].count = ch->trans_skb->len;
|
|
fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
|
|
ch->prof.send_stamp = current_kernel_time();
|
|
rc = ccw_device_start(ch->cdev, &ch->ccw[0],
|
|
(unsigned long) ch, 0xff, 0);
|
|
ch->prof.doios_multi++;
|
|
if (rc != 0) {
|
|
privptr->stats.tx_dropped += i;
|
|
privptr->stats.tx_errors += i;
|
|
fsm_deltimer(&ch->timer);
|
|
ccw_check_return_code(ch, rc, "chained TX");
|
|
}
|
|
} else {
|
|
spin_unlock(&ch->collect_lock);
|
|
fsm_newstate(fi, CH_STATE_TXIDLE);
|
|
}
|
|
ctc_clear_busy(dev);
|
|
}
|
|
|
|
/**
|
|
* Initial data is sent.
|
|
* Notify device statemachine that we are up and
|
|
* running.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_txidle(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
|
|
DBF_TEXT(trace, 4, __FUNCTION__);
|
|
fsm_deltimer(&ch->timer);
|
|
fsm_newstate(fi, CH_STATE_TXIDLE);
|
|
fsm_event(((struct ctc_priv *) ch->netdev->priv)->fsm, DEV_EVENT_TXUP,
|
|
ch->netdev);
|
|
}
|
|
|
|
/**
|
|
* Got normal data, check for sanity, queue it up, allocate new buffer
|
|
* trigger bottom half, and initiate next read.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_rx(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
struct net_device *dev = ch->netdev;
|
|
struct ctc_priv *privptr = dev->priv;
|
|
int len = ch->max_bufsize - ch->irb->scsw.count;
|
|
struct sk_buff *skb = ch->trans_skb;
|
|
__u16 block_len = *((__u16 *) skb->data);
|
|
int check_len;
|
|
int rc;
|
|
|
|
DBF_TEXT(trace, 4, __FUNCTION__);
|
|
fsm_deltimer(&ch->timer);
|
|
if (len < 8) {
|
|
ctc_pr_debug("%s: got packet with length %d < 8\n",
|
|
dev->name, len);
|
|
privptr->stats.rx_dropped++;
|
|
privptr->stats.rx_length_errors++;
|
|
goto again;
|
|
}
|
|
if (len > ch->max_bufsize) {
|
|
ctc_pr_debug("%s: got packet with length %d > %d\n",
|
|
dev->name, len, ch->max_bufsize);
|
|
privptr->stats.rx_dropped++;
|
|
privptr->stats.rx_length_errors++;
|
|
goto again;
|
|
}
|
|
|
|
/**
|
|
* VM TCP seems to have a bug sending 2 trailing bytes of garbage.
|
|
*/
|
|
switch (ch->protocol) {
|
|
case CTC_PROTO_S390:
|
|
case CTC_PROTO_OS390:
|
|
check_len = block_len + 2;
|
|
break;
|
|
default:
|
|
check_len = block_len;
|
|
break;
|
|
}
|
|
if ((len < block_len) || (len > check_len)) {
|
|
ctc_pr_debug("%s: got block length %d != rx length %d\n",
|
|
dev->name, block_len, len);
|
|
#ifdef DEBUG
|
|
ctc_dump_skb(skb, 0);
|
|
#endif
|
|
*((__u16 *) skb->data) = len;
|
|
privptr->stats.rx_dropped++;
|
|
privptr->stats.rx_length_errors++;
|
|
goto again;
|
|
}
|
|
block_len -= 2;
|
|
if (block_len > 0) {
|
|
*((__u16 *) skb->data) = block_len;
|
|
ctc_unpack_skb(ch, skb);
|
|
}
|
|
again:
|
|
skb->data = ch->trans_skb_data;
|
|
skb_reset_tail_pointer(skb);
|
|
skb->len = 0;
|
|
if (ctc_checkalloc_buffer(ch, 1))
|
|
return;
|
|
ch->ccw[1].count = ch->max_bufsize;
|
|
rc = ccw_device_start(ch->cdev, &ch->ccw[0], (unsigned long) ch, 0xff, 0);
|
|
if (rc != 0)
|
|
ccw_check_return_code(ch, rc, "normal RX");
|
|
}
|
|
|
|
static void ch_action_rxidle(fsm_instance * fi, int event, void *arg);
|
|
|
|
/**
|
|
* Initialize connection by sending a __u16 of value 0.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_firstio(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
int rc;
|
|
|
|
DBF_TEXT(trace, 4, __FUNCTION__);
|
|
|
|
if (fsm_getstate(fi) == CH_STATE_TXIDLE)
|
|
ctc_pr_debug("%s: remote side issued READ?, init ...\n", ch->id);
|
|
fsm_deltimer(&ch->timer);
|
|
if (ctc_checkalloc_buffer(ch, 1))
|
|
return;
|
|
if ((fsm_getstate(fi) == CH_STATE_SETUPWAIT) &&
|
|
(ch->protocol == CTC_PROTO_OS390)) {
|
|
/* OS/390 resp. z/OS */
|
|
if (CHANNEL_DIRECTION(ch->flags) == READ) {
|
|
*((__u16 *) ch->trans_skb->data) = CTC_INITIAL_BLOCKLEN;
|
|
fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC,
|
|
CH_EVENT_TIMER, ch);
|
|
ch_action_rxidle(fi, event, arg);
|
|
} else {
|
|
struct net_device *dev = ch->netdev;
|
|
fsm_newstate(fi, CH_STATE_TXIDLE);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm,
|
|
DEV_EVENT_TXUP, dev);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* Don't setup a timer for receiving the initial RX frame
|
|
* if in compatibility mode, since VM TCP delays the initial
|
|
* frame until it has some data to send.
|
|
*/
|
|
if ((CHANNEL_DIRECTION(ch->flags) == WRITE) ||
|
|
(ch->protocol != CTC_PROTO_S390))
|
|
fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
|
|
|
|
*((__u16 *) ch->trans_skb->data) = CTC_INITIAL_BLOCKLEN;
|
|
ch->ccw[1].count = 2; /* Transfer only length */
|
|
|
|
fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == READ)
|
|
? CH_STATE_RXINIT : CH_STATE_TXINIT);
|
|
rc = ccw_device_start(ch->cdev, &ch->ccw[0], (unsigned long) ch, 0xff, 0);
|
|
if (rc != 0) {
|
|
fsm_deltimer(&ch->timer);
|
|
fsm_newstate(fi, CH_STATE_SETUPWAIT);
|
|
ccw_check_return_code(ch, rc, "init IO");
|
|
}
|
|
/**
|
|
* If in compatibility mode since we don't setup a timer, we
|
|
* also signal RX channel up immediately. This enables us
|
|
* to send packets early which in turn usually triggers some
|
|
* reply from VM TCP which brings up the RX channel to it's
|
|
* final state.
|
|
*/
|
|
if ((CHANNEL_DIRECTION(ch->flags) == READ) &&
|
|
(ch->protocol == CTC_PROTO_S390)) {
|
|
struct net_device *dev = ch->netdev;
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXUP,
|
|
dev);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Got initial data, check it. If OK,
|
|
* notify device statemachine that we are up and
|
|
* running.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_rxidle(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
struct net_device *dev = ch->netdev;
|
|
__u16 buflen;
|
|
int rc;
|
|
|
|
DBF_TEXT(trace, 4, __FUNCTION__);
|
|
fsm_deltimer(&ch->timer);
|
|
buflen = *((__u16 *) ch->trans_skb->data);
|
|
#ifdef DEBUG
|
|
ctc_pr_debug("%s: Initial RX count %d\n", dev->name, buflen);
|
|
#endif
|
|
if (buflen >= CTC_INITIAL_BLOCKLEN) {
|
|
if (ctc_checkalloc_buffer(ch, 1))
|
|
return;
|
|
ch->ccw[1].count = ch->max_bufsize;
|
|
fsm_newstate(fi, CH_STATE_RXIDLE);
|
|
rc = ccw_device_start(ch->cdev, &ch->ccw[0],
|
|
(unsigned long) ch, 0xff, 0);
|
|
if (rc != 0) {
|
|
fsm_newstate(fi, CH_STATE_RXINIT);
|
|
ccw_check_return_code(ch, rc, "initial RX");
|
|
} else
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm,
|
|
DEV_EVENT_RXUP, dev);
|
|
} else {
|
|
ctc_pr_debug("%s: Initial RX count %d not %d\n",
|
|
dev->name, buflen, CTC_INITIAL_BLOCKLEN);
|
|
ch_action_firstio(fi, event, arg);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Set channel into extended mode.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_setmode(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
int rc;
|
|
unsigned long saveflags;
|
|
|
|
DBF_TEXT(trace, 4, __FUNCTION__);
|
|
fsm_deltimer(&ch->timer);
|
|
fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
|
|
fsm_newstate(fi, CH_STATE_SETUPWAIT);
|
|
saveflags = 0; /* avoids compiler warning with
|
|
spin_unlock_irqrestore */
|
|
if (event == CH_EVENT_TIMER) // only for timer not yet locked
|
|
spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
|
|
rc = ccw_device_start(ch->cdev, &ch->ccw[6], (unsigned long) ch, 0xff, 0);
|
|
if (event == CH_EVENT_TIMER)
|
|
spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
|
|
if (rc != 0) {
|
|
fsm_deltimer(&ch->timer);
|
|
fsm_newstate(fi, CH_STATE_STARTWAIT);
|
|
ccw_check_return_code(ch, rc, "set Mode");
|
|
} else
|
|
ch->retry = 0;
|
|
}
|
|
|
|
/**
|
|
* Setup channel.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_start(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
unsigned long saveflags;
|
|
int rc;
|
|
struct net_device *dev;
|
|
|
|
DBF_TEXT(trace, 4, __FUNCTION__);
|
|
if (ch == NULL) {
|
|
ctc_pr_warn("ch_action_start ch=NULL\n");
|
|
return;
|
|
}
|
|
if (ch->netdev == NULL) {
|
|
ctc_pr_warn("ch_action_start dev=NULL, id=%s\n", ch->id);
|
|
return;
|
|
}
|
|
dev = ch->netdev;
|
|
|
|
#ifdef DEBUG
|
|
ctc_pr_debug("%s: %s channel start\n", dev->name,
|
|
(CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
|
|
#endif
|
|
|
|
if (ch->trans_skb != NULL) {
|
|
clear_normalized_cda(&ch->ccw[1]);
|
|
dev_kfree_skb(ch->trans_skb);
|
|
ch->trans_skb = NULL;
|
|
}
|
|
if (CHANNEL_DIRECTION(ch->flags) == READ) {
|
|
ch->ccw[1].cmd_code = CCW_CMD_READ;
|
|
ch->ccw[1].flags = CCW_FLAG_SLI;
|
|
ch->ccw[1].count = 0;
|
|
} else {
|
|
ch->ccw[1].cmd_code = CCW_CMD_WRITE;
|
|
ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
|
|
ch->ccw[1].count = 0;
|
|
}
|
|
if (ctc_checkalloc_buffer(ch, 0)) {
|
|
ctc_pr_notice(
|
|
"%s: Could not allocate %s trans_skb, delaying "
|
|
"allocation until first transfer\n",
|
|
dev->name,
|
|
(CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
|
|
}
|
|
|
|
ch->ccw[0].cmd_code = CCW_CMD_PREPARE;
|
|
ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
|
|
ch->ccw[0].count = 0;
|
|
ch->ccw[0].cda = 0;
|
|
ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */
|
|
ch->ccw[2].flags = CCW_FLAG_SLI;
|
|
ch->ccw[2].count = 0;
|
|
ch->ccw[2].cda = 0;
|
|
memcpy(&ch->ccw[3], &ch->ccw[0], sizeof (struct ccw1) * 3);
|
|
ch->ccw[4].cda = 0;
|
|
ch->ccw[4].flags &= ~CCW_FLAG_IDA;
|
|
|
|
fsm_newstate(fi, CH_STATE_STARTWAIT);
|
|
fsm_addtimer(&ch->timer, 1000, CH_EVENT_TIMER, ch);
|
|
spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
|
|
rc = ccw_device_halt(ch->cdev, (unsigned long) ch);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
|
|
if (rc != 0) {
|
|
if (rc != -EBUSY)
|
|
fsm_deltimer(&ch->timer);
|
|
ccw_check_return_code(ch, rc, "initial HaltIO");
|
|
}
|
|
#ifdef DEBUG
|
|
ctc_pr_debug("ctc: %s(): leaving\n", __func__);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* Shutdown a channel.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_haltio(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
unsigned long saveflags;
|
|
int rc;
|
|
int oldstate;
|
|
|
|
DBF_TEXT(trace, 3, __FUNCTION__);
|
|
fsm_deltimer(&ch->timer);
|
|
fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
|
|
saveflags = 0; /* avoids comp warning with
|
|
spin_unlock_irqrestore */
|
|
if (event == CH_EVENT_STOP) // only for STOP not yet locked
|
|
spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
|
|
oldstate = fsm_getstate(fi);
|
|
fsm_newstate(fi, CH_STATE_TERM);
|
|
rc = ccw_device_halt(ch->cdev, (unsigned long) ch);
|
|
if (event == CH_EVENT_STOP)
|
|
spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
|
|
if (rc != 0) {
|
|
if (rc != -EBUSY) {
|
|
fsm_deltimer(&ch->timer);
|
|
fsm_newstate(fi, oldstate);
|
|
}
|
|
ccw_check_return_code(ch, rc, "HaltIO in ch_action_haltio");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A channel has successfully been halted.
|
|
* Cleanup it's queue and notify interface statemachine.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_stopped(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
struct net_device *dev = ch->netdev;
|
|
|
|
DBF_TEXT(trace, 3, __FUNCTION__);
|
|
fsm_deltimer(&ch->timer);
|
|
fsm_newstate(fi, CH_STATE_STOPPED);
|
|
if (ch->trans_skb != NULL) {
|
|
clear_normalized_cda(&ch->ccw[1]);
|
|
dev_kfree_skb(ch->trans_skb);
|
|
ch->trans_skb = NULL;
|
|
}
|
|
if (CHANNEL_DIRECTION(ch->flags) == READ) {
|
|
skb_queue_purge(&ch->io_queue);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm,
|
|
DEV_EVENT_RXDOWN, dev);
|
|
} else {
|
|
ctc_purge_skb_queue(&ch->io_queue);
|
|
spin_lock(&ch->collect_lock);
|
|
ctc_purge_skb_queue(&ch->collect_queue);
|
|
ch->collect_len = 0;
|
|
spin_unlock(&ch->collect_lock);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm,
|
|
DEV_EVENT_TXDOWN, dev);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A stop command from device statemachine arrived and we are in
|
|
* not operational mode. Set state to stopped.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_stop(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
fsm_newstate(fi, CH_STATE_STOPPED);
|
|
}
|
|
|
|
/**
|
|
* A machine check for no path, not operational status or gone device has
|
|
* happened.
|
|
* Cleanup queue and notify interface statemachine.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_fail(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
struct net_device *dev = ch->netdev;
|
|
|
|
DBF_TEXT(trace, 3, __FUNCTION__);
|
|
fsm_deltimer(&ch->timer);
|
|
fsm_newstate(fi, CH_STATE_NOTOP);
|
|
if (CHANNEL_DIRECTION(ch->flags) == READ) {
|
|
skb_queue_purge(&ch->io_queue);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm,
|
|
DEV_EVENT_RXDOWN, dev);
|
|
} else {
|
|
ctc_purge_skb_queue(&ch->io_queue);
|
|
spin_lock(&ch->collect_lock);
|
|
ctc_purge_skb_queue(&ch->collect_queue);
|
|
ch->collect_len = 0;
|
|
spin_unlock(&ch->collect_lock);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm,
|
|
DEV_EVENT_TXDOWN, dev);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handle error during setup of channel.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_setuperr(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
struct net_device *dev = ch->netdev;
|
|
|
|
DBF_TEXT(setup, 3, __FUNCTION__);
|
|
/**
|
|
* Special case: Got UC_RCRESET on setmode.
|
|
* This means that remote side isn't setup. In this case
|
|
* simply retry after some 10 secs...
|
|
*/
|
|
if ((fsm_getstate(fi) == CH_STATE_SETUPWAIT) &&
|
|
((event == CH_EVENT_UC_RCRESET) ||
|
|
(event == CH_EVENT_UC_RSRESET))) {
|
|
fsm_newstate(fi, CH_STATE_STARTRETRY);
|
|
fsm_deltimer(&ch->timer);
|
|
fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
|
|
if (CHANNEL_DIRECTION(ch->flags) == READ) {
|
|
int rc = ccw_device_halt(ch->cdev, (unsigned long) ch);
|
|
if (rc != 0)
|
|
ccw_check_return_code(
|
|
ch, rc, "HaltIO in ch_action_setuperr");
|
|
}
|
|
return;
|
|
}
|
|
|
|
ctc_pr_debug("%s: Error %s during %s channel setup state=%s\n",
|
|
dev->name, ch_event_names[event],
|
|
(CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX",
|
|
fsm_getstate_str(fi));
|
|
if (CHANNEL_DIRECTION(ch->flags) == READ) {
|
|
fsm_newstate(fi, CH_STATE_RXERR);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm,
|
|
DEV_EVENT_RXDOWN, dev);
|
|
} else {
|
|
fsm_newstate(fi, CH_STATE_TXERR);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm,
|
|
DEV_EVENT_TXDOWN, dev);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Restart a channel after an error.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_restart(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
unsigned long saveflags;
|
|
int oldstate;
|
|
int rc;
|
|
|
|
struct channel *ch = (struct channel *) arg;
|
|
struct net_device *dev = ch->netdev;
|
|
|
|
DBF_TEXT(trace, 3, __FUNCTION__);
|
|
fsm_deltimer(&ch->timer);
|
|
ctc_pr_debug("%s: %s channel restart\n", dev->name,
|
|
(CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
|
|
fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
|
|
oldstate = fsm_getstate(fi);
|
|
fsm_newstate(fi, CH_STATE_STARTWAIT);
|
|
saveflags = 0; /* avoids compiler warning with
|
|
spin_unlock_irqrestore */
|
|
if (event == CH_EVENT_TIMER) // only for timer not yet locked
|
|
spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
|
|
rc = ccw_device_halt(ch->cdev, (unsigned long) ch);
|
|
if (event == CH_EVENT_TIMER)
|
|
spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
|
|
if (rc != 0) {
|
|
if (rc != -EBUSY) {
|
|
fsm_deltimer(&ch->timer);
|
|
fsm_newstate(fi, oldstate);
|
|
}
|
|
ccw_check_return_code(ch, rc, "HaltIO in ch_action_restart");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handle error during RX initial handshake (exchange of
|
|
* 0-length block header)
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_rxiniterr(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
struct net_device *dev = ch->netdev;
|
|
|
|
DBF_TEXT(setup, 3, __FUNCTION__);
|
|
if (event == CH_EVENT_TIMER) {
|
|
fsm_deltimer(&ch->timer);
|
|
ctc_pr_debug("%s: Timeout during RX init handshake\n", dev->name);
|
|
if (ch->retry++ < 3)
|
|
ch_action_restart(fi, event, arg);
|
|
else {
|
|
fsm_newstate(fi, CH_STATE_RXERR);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm,
|
|
DEV_EVENT_RXDOWN, dev);
|
|
}
|
|
} else
|
|
ctc_pr_warn("%s: Error during RX init handshake\n", dev->name);
|
|
}
|
|
|
|
/**
|
|
* Notify device statemachine if we gave up initialization
|
|
* of RX channel.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_rxinitfail(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
struct net_device *dev = ch->netdev;
|
|
|
|
DBF_TEXT(setup, 3, __FUNCTION__);
|
|
fsm_newstate(fi, CH_STATE_RXERR);
|
|
ctc_pr_warn("%s: RX initialization failed\n", dev->name);
|
|
ctc_pr_warn("%s: RX <-> RX connection detected\n", dev->name);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev);
|
|
}
|
|
|
|
/**
|
|
* Handle RX Unit check remote reset (remote disconnected)
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_rxdisc(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
struct channel *ch2;
|
|
struct net_device *dev = ch->netdev;
|
|
|
|
DBF_TEXT(trace, 3, __FUNCTION__);
|
|
fsm_deltimer(&ch->timer);
|
|
ctc_pr_debug("%s: Got remote disconnect, re-initializing ...\n",
|
|
dev->name);
|
|
|
|
/**
|
|
* Notify device statemachine
|
|
*/
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_TXDOWN, dev);
|
|
|
|
fsm_newstate(fi, CH_STATE_DTERM);
|
|
ch2 = ((struct ctc_priv *) dev->priv)->channel[WRITE];
|
|
fsm_newstate(ch2->fsm, CH_STATE_DTERM);
|
|
|
|
ccw_device_halt(ch->cdev, (unsigned long) ch);
|
|
ccw_device_halt(ch2->cdev, (unsigned long) ch2);
|
|
}
|
|
|
|
/**
|
|
* Handle error during TX channel initialization.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_txiniterr(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
struct net_device *dev = ch->netdev;
|
|
|
|
DBF_TEXT(setup, 2, __FUNCTION__);
|
|
if (event == CH_EVENT_TIMER) {
|
|
fsm_deltimer(&ch->timer);
|
|
ctc_pr_debug("%s: Timeout during TX init handshake\n", dev->name);
|
|
if (ch->retry++ < 3)
|
|
ch_action_restart(fi, event, arg);
|
|
else {
|
|
fsm_newstate(fi, CH_STATE_TXERR);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm,
|
|
DEV_EVENT_TXDOWN, dev);
|
|
}
|
|
} else
|
|
ctc_pr_warn("%s: Error during TX init handshake\n", dev->name);
|
|
}
|
|
|
|
/**
|
|
* Handle TX timeout by retrying operation.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_txretry(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
struct net_device *dev = ch->netdev;
|
|
unsigned long saveflags;
|
|
|
|
DBF_TEXT(trace, 4, __FUNCTION__);
|
|
fsm_deltimer(&ch->timer);
|
|
if (ch->retry++ > 3) {
|
|
ctc_pr_debug("%s: TX retry failed, restarting channel\n",
|
|
dev->name);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm,
|
|
DEV_EVENT_TXDOWN, dev);
|
|
ch_action_restart(fi, event, arg);
|
|
} else {
|
|
struct sk_buff *skb;
|
|
|
|
ctc_pr_debug("%s: TX retry %d\n", dev->name, ch->retry);
|
|
if ((skb = skb_peek(&ch->io_queue))) {
|
|
int rc = 0;
|
|
|
|
clear_normalized_cda(&ch->ccw[4]);
|
|
ch->ccw[4].count = skb->len;
|
|
if (set_normalized_cda(&ch->ccw[4], skb->data)) {
|
|
ctc_pr_debug(
|
|
"%s: IDAL alloc failed, chan restart\n",
|
|
dev->name);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm,
|
|
DEV_EVENT_TXDOWN, dev);
|
|
ch_action_restart(fi, event, arg);
|
|
return;
|
|
}
|
|
fsm_addtimer(&ch->timer, 1000, CH_EVENT_TIMER, ch);
|
|
saveflags = 0; /* avoids compiler warning with
|
|
spin_unlock_irqrestore */
|
|
if (event == CH_EVENT_TIMER) // only for TIMER not yet locked
|
|
spin_lock_irqsave(get_ccwdev_lock(ch->cdev),
|
|
saveflags);
|
|
rc = ccw_device_start(ch->cdev, &ch->ccw[3],
|
|
(unsigned long) ch, 0xff, 0);
|
|
if (event == CH_EVENT_TIMER)
|
|
spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
|
|
saveflags);
|
|
if (rc != 0) {
|
|
fsm_deltimer(&ch->timer);
|
|
ccw_check_return_code(ch, rc, "TX in ch_action_txretry");
|
|
ctc_purge_skb_queue(&ch->io_queue);
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Handle fatal errors during an I/O command.
|
|
*
|
|
* @param fi An instance of a channel statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from channel * upon call.
|
|
*/
|
|
static void
|
|
ch_action_iofatal(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *) arg;
|
|
struct net_device *dev = ch->netdev;
|
|
|
|
DBF_TEXT(trace, 3, __FUNCTION__);
|
|
fsm_deltimer(&ch->timer);
|
|
if (CHANNEL_DIRECTION(ch->flags) == READ) {
|
|
ctc_pr_debug("%s: RX I/O error\n", dev->name);
|
|
fsm_newstate(fi, CH_STATE_RXERR);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm,
|
|
DEV_EVENT_RXDOWN, dev);
|
|
} else {
|
|
ctc_pr_debug("%s: TX I/O error\n", dev->name);
|
|
fsm_newstate(fi, CH_STATE_TXERR);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm,
|
|
DEV_EVENT_TXDOWN, dev);
|
|
}
|
|
}
|
|
|
|
static void
|
|
ch_action_reinit(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
struct channel *ch = (struct channel *)arg;
|
|
struct net_device *dev = ch->netdev;
|
|
struct ctc_priv *privptr = dev->priv;
|
|
|
|
DBF_TEXT(trace, 4, __FUNCTION__);
|
|
ch_action_iofatal(fi, event, arg);
|
|
fsm_addtimer(&privptr->restart_timer, 1000, DEV_EVENT_RESTART, dev);
|
|
}
|
|
|
|
/**
|
|
* The statemachine for a channel.
|
|
*/
|
|
static const fsm_node ch_fsm[] = {
|
|
{CH_STATE_STOPPED, CH_EVENT_STOP, fsm_action_nop },
|
|
{CH_STATE_STOPPED, CH_EVENT_START, ch_action_start },
|
|
{CH_STATE_STOPPED, CH_EVENT_FINSTAT, fsm_action_nop },
|
|
{CH_STATE_STOPPED, CH_EVENT_MC_FAIL, fsm_action_nop },
|
|
|
|
{CH_STATE_NOTOP, CH_EVENT_STOP, ch_action_stop },
|
|
{CH_STATE_NOTOP, CH_EVENT_START, fsm_action_nop },
|
|
{CH_STATE_NOTOP, CH_EVENT_FINSTAT, fsm_action_nop },
|
|
{CH_STATE_NOTOP, CH_EVENT_MC_FAIL, fsm_action_nop },
|
|
{CH_STATE_NOTOP, CH_EVENT_MC_GOOD, ch_action_start },
|
|
|
|
{CH_STATE_STARTWAIT, CH_EVENT_STOP, ch_action_haltio },
|
|
{CH_STATE_STARTWAIT, CH_EVENT_START, fsm_action_nop },
|
|
{CH_STATE_STARTWAIT, CH_EVENT_FINSTAT, ch_action_setmode },
|
|
{CH_STATE_STARTWAIT, CH_EVENT_TIMER, ch_action_setuperr },
|
|
{CH_STATE_STARTWAIT, CH_EVENT_IO_ENODEV, ch_action_iofatal },
|
|
{CH_STATE_STARTWAIT, CH_EVENT_IO_EIO, ch_action_reinit },
|
|
{CH_STATE_STARTWAIT, CH_EVENT_MC_FAIL, ch_action_fail },
|
|
|
|
{CH_STATE_STARTRETRY, CH_EVENT_STOP, ch_action_haltio },
|
|
{CH_STATE_STARTRETRY, CH_EVENT_TIMER, ch_action_setmode },
|
|
{CH_STATE_STARTRETRY, CH_EVENT_FINSTAT, fsm_action_nop },
|
|
{CH_STATE_STARTRETRY, CH_EVENT_MC_FAIL, ch_action_fail },
|
|
|
|
{CH_STATE_SETUPWAIT, CH_EVENT_STOP, ch_action_haltio },
|
|
{CH_STATE_SETUPWAIT, CH_EVENT_START, fsm_action_nop },
|
|
{CH_STATE_SETUPWAIT, CH_EVENT_FINSTAT, ch_action_firstio },
|
|
{CH_STATE_SETUPWAIT, CH_EVENT_UC_RCRESET, ch_action_setuperr },
|
|
{CH_STATE_SETUPWAIT, CH_EVENT_UC_RSRESET, ch_action_setuperr },
|
|
{CH_STATE_SETUPWAIT, CH_EVENT_TIMER, ch_action_setmode },
|
|
{CH_STATE_SETUPWAIT, CH_EVENT_IO_ENODEV, ch_action_iofatal },
|
|
{CH_STATE_SETUPWAIT, CH_EVENT_IO_EIO, ch_action_reinit },
|
|
{CH_STATE_SETUPWAIT, CH_EVENT_MC_FAIL, ch_action_fail },
|
|
|
|
{CH_STATE_RXINIT, CH_EVENT_STOP, ch_action_haltio },
|
|
{CH_STATE_RXINIT, CH_EVENT_START, fsm_action_nop },
|
|
{CH_STATE_RXINIT, CH_EVENT_FINSTAT, ch_action_rxidle },
|
|
{CH_STATE_RXINIT, CH_EVENT_UC_RCRESET, ch_action_rxiniterr },
|
|
{CH_STATE_RXINIT, CH_EVENT_UC_RSRESET, ch_action_rxiniterr },
|
|
{CH_STATE_RXINIT, CH_EVENT_TIMER, ch_action_rxiniterr },
|
|
{CH_STATE_RXINIT, CH_EVENT_ATTNBUSY, ch_action_rxinitfail },
|
|
{CH_STATE_RXINIT, CH_EVENT_IO_ENODEV, ch_action_iofatal },
|
|
{CH_STATE_RXINIT, CH_EVENT_IO_EIO, ch_action_reinit },
|
|
{CH_STATE_RXINIT, CH_EVENT_UC_ZERO, ch_action_firstio },
|
|
{CH_STATE_RXINIT, CH_EVENT_MC_FAIL, ch_action_fail },
|
|
|
|
{CH_STATE_RXIDLE, CH_EVENT_STOP, ch_action_haltio },
|
|
{CH_STATE_RXIDLE, CH_EVENT_START, fsm_action_nop },
|
|
{CH_STATE_RXIDLE, CH_EVENT_FINSTAT, ch_action_rx },
|
|
{CH_STATE_RXIDLE, CH_EVENT_UC_RCRESET, ch_action_rxdisc },
|
|
// {CH_STATE_RXIDLE, CH_EVENT_UC_RSRESET, ch_action_rxretry },
|
|
{CH_STATE_RXIDLE, CH_EVENT_IO_ENODEV, ch_action_iofatal },
|
|
{CH_STATE_RXIDLE, CH_EVENT_IO_EIO, ch_action_reinit },
|
|
{CH_STATE_RXIDLE, CH_EVENT_MC_FAIL, ch_action_fail },
|
|
{CH_STATE_RXIDLE, CH_EVENT_UC_ZERO, ch_action_rx },
|
|
|
|
{CH_STATE_TXINIT, CH_EVENT_STOP, ch_action_haltio },
|
|
{CH_STATE_TXINIT, CH_EVENT_START, fsm_action_nop },
|
|
{CH_STATE_TXINIT, CH_EVENT_FINSTAT, ch_action_txidle },
|
|
{CH_STATE_TXINIT, CH_EVENT_UC_RCRESET, ch_action_txiniterr },
|
|
{CH_STATE_TXINIT, CH_EVENT_UC_RSRESET, ch_action_txiniterr },
|
|
{CH_STATE_TXINIT, CH_EVENT_TIMER, ch_action_txiniterr },
|
|
{CH_STATE_TXINIT, CH_EVENT_IO_ENODEV, ch_action_iofatal },
|
|
{CH_STATE_TXINIT, CH_EVENT_IO_EIO, ch_action_reinit },
|
|
{CH_STATE_TXINIT, CH_EVENT_MC_FAIL, ch_action_fail },
|
|
|
|
{CH_STATE_TXIDLE, CH_EVENT_STOP, ch_action_haltio },
|
|
{CH_STATE_TXIDLE, CH_EVENT_START, fsm_action_nop },
|
|
{CH_STATE_TXIDLE, CH_EVENT_FINSTAT, ch_action_firstio },
|
|
{CH_STATE_TXIDLE, CH_EVENT_UC_RCRESET, fsm_action_nop },
|
|
{CH_STATE_TXIDLE, CH_EVENT_UC_RSRESET, fsm_action_nop },
|
|
{CH_STATE_TXIDLE, CH_EVENT_IO_ENODEV, ch_action_iofatal },
|
|
{CH_STATE_TXIDLE, CH_EVENT_IO_EIO, ch_action_reinit },
|
|
{CH_STATE_TXIDLE, CH_EVENT_MC_FAIL, ch_action_fail },
|
|
|
|
{CH_STATE_TERM, CH_EVENT_STOP, fsm_action_nop },
|
|
{CH_STATE_TERM, CH_EVENT_START, ch_action_restart },
|
|
{CH_STATE_TERM, CH_EVENT_FINSTAT, ch_action_stopped },
|
|
{CH_STATE_TERM, CH_EVENT_UC_RCRESET, fsm_action_nop },
|
|
{CH_STATE_TERM, CH_EVENT_UC_RSRESET, fsm_action_nop },
|
|
{CH_STATE_TERM, CH_EVENT_MC_FAIL, ch_action_fail },
|
|
|
|
{CH_STATE_DTERM, CH_EVENT_STOP, ch_action_haltio },
|
|
{CH_STATE_DTERM, CH_EVENT_START, ch_action_restart },
|
|
{CH_STATE_DTERM, CH_EVENT_FINSTAT, ch_action_setmode },
|
|
{CH_STATE_DTERM, CH_EVENT_UC_RCRESET, fsm_action_nop },
|
|
{CH_STATE_DTERM, CH_EVENT_UC_RSRESET, fsm_action_nop },
|
|
{CH_STATE_DTERM, CH_EVENT_MC_FAIL, ch_action_fail },
|
|
|
|
{CH_STATE_TX, CH_EVENT_STOP, ch_action_haltio },
|
|
{CH_STATE_TX, CH_EVENT_START, fsm_action_nop },
|
|
{CH_STATE_TX, CH_EVENT_FINSTAT, ch_action_txdone },
|
|
{CH_STATE_TX, CH_EVENT_UC_RCRESET, ch_action_txretry },
|
|
{CH_STATE_TX, CH_EVENT_UC_RSRESET, ch_action_txretry },
|
|
{CH_STATE_TX, CH_EVENT_TIMER, ch_action_txretry },
|
|
{CH_STATE_TX, CH_EVENT_IO_ENODEV, ch_action_iofatal },
|
|
{CH_STATE_TX, CH_EVENT_IO_EIO, ch_action_reinit },
|
|
{CH_STATE_TX, CH_EVENT_MC_FAIL, ch_action_fail },
|
|
|
|
{CH_STATE_RXERR, CH_EVENT_STOP, ch_action_haltio },
|
|
{CH_STATE_TXERR, CH_EVENT_STOP, ch_action_haltio },
|
|
{CH_STATE_TXERR, CH_EVENT_MC_FAIL, ch_action_fail },
|
|
{CH_STATE_RXERR, CH_EVENT_MC_FAIL, ch_action_fail },
|
|
};
|
|
|
|
static const int CH_FSM_LEN = sizeof (ch_fsm) / sizeof (fsm_node);
|
|
|
|
/**
|
|
* Functions related to setup and device detection.
|
|
*****************************************************************************/
|
|
|
|
static inline int
|
|
less_than(char *id1, char *id2)
|
|
{
|
|
int dev1, dev2, i;
|
|
|
|
for (i = 0; i < 5; i++) {
|
|
id1++;
|
|
id2++;
|
|
}
|
|
dev1 = simple_strtoul(id1, &id1, 16);
|
|
dev2 = simple_strtoul(id2, &id2, 16);
|
|
|
|
return (dev1 < dev2);
|
|
}
|
|
|
|
/**
|
|
* Add a new channel to the list of channels.
|
|
* Keeps the channel list sorted.
|
|
*
|
|
* @param cdev The ccw_device to be added.
|
|
* @param type The type class of the new channel.
|
|
*
|
|
* @return 0 on success, !0 on error.
|
|
*/
|
|
static int
|
|
add_channel(struct ccw_device *cdev, enum channel_types type)
|
|
{
|
|
struct channel **c = &channels;
|
|
struct channel *ch;
|
|
|
|
DBF_TEXT(trace, 2, __FUNCTION__);
|
|
ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
|
|
if (!ch) {
|
|
ctc_pr_warn("ctc: Out of memory in add_channel\n");
|
|
return -1;
|
|
}
|
|
/* assure all flags and counters are reset */
|
|
ch->ccw = kzalloc(8 * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
|
|
if (!ch->ccw) {
|
|
kfree(ch);
|
|
ctc_pr_warn("ctc: Out of memory in add_channel\n");
|
|
return -1;
|
|
}
|
|
|
|
|
|
/**
|
|
* "static" ccws are used in the following way:
|
|
*
|
|
* ccw[0..2] (Channel program for generic I/O):
|
|
* 0: prepare
|
|
* 1: read or write (depending on direction) with fixed
|
|
* buffer (idal allocated once when buffer is allocated)
|
|
* 2: nop
|
|
* ccw[3..5] (Channel program for direct write of packets)
|
|
* 3: prepare
|
|
* 4: write (idal allocated on every write).
|
|
* 5: nop
|
|
* ccw[6..7] (Channel program for initial channel setup):
|
|
* 6: set extended mode
|
|
* 7: nop
|
|
*
|
|
* ch->ccw[0..5] are initialized in ch_action_start because
|
|
* the channel's direction is yet unknown here.
|
|
*/
|
|
ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
|
|
ch->ccw[6].flags = CCW_FLAG_SLI;
|
|
|
|
ch->ccw[7].cmd_code = CCW_CMD_NOOP;
|
|
ch->ccw[7].flags = CCW_FLAG_SLI;
|
|
|
|
ch->cdev = cdev;
|
|
snprintf(ch->id, CTC_ID_SIZE, "ch-%s", cdev->dev.bus_id);
|
|
ch->type = type;
|
|
ch->fsm = init_fsm(ch->id, ch_state_names,
|
|
ch_event_names, NR_CH_STATES, NR_CH_EVENTS,
|
|
ch_fsm, CH_FSM_LEN, GFP_KERNEL);
|
|
if (ch->fsm == NULL) {
|
|
ctc_pr_warn("ctc: Could not create FSM in add_channel\n");
|
|
kfree(ch->ccw);
|
|
kfree(ch);
|
|
return -1;
|
|
}
|
|
fsm_newstate(ch->fsm, CH_STATE_IDLE);
|
|
ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
|
|
if (!ch->irb) {
|
|
ctc_pr_warn("ctc: Out of memory in add_channel\n");
|
|
kfree_fsm(ch->fsm);
|
|
kfree(ch->ccw);
|
|
kfree(ch);
|
|
return -1;
|
|
}
|
|
while (*c && less_than((*c)->id, ch->id))
|
|
c = &(*c)->next;
|
|
if (*c && (!strncmp((*c)->id, ch->id, CTC_ID_SIZE))) {
|
|
ctc_pr_debug(
|
|
"ctc: add_channel: device %s already in list, "
|
|
"using old entry\n", (*c)->id);
|
|
kfree(ch->irb);
|
|
kfree_fsm(ch->fsm);
|
|
kfree(ch->ccw);
|
|
kfree(ch);
|
|
return 0;
|
|
}
|
|
|
|
spin_lock_init(&ch->collect_lock);
|
|
|
|
fsm_settimer(ch->fsm, &ch->timer);
|
|
skb_queue_head_init(&ch->io_queue);
|
|
skb_queue_head_init(&ch->collect_queue);
|
|
ch->next = *c;
|
|
*c = ch;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Release a specific channel in the channel list.
|
|
*
|
|
* @param ch Pointer to channel struct to be released.
|
|
*/
|
|
static void
|
|
channel_free(struct channel *ch)
|
|
{
|
|
ch->flags &= ~CHANNEL_FLAGS_INUSE;
|
|
fsm_newstate(ch->fsm, CH_STATE_IDLE);
|
|
}
|
|
|
|
/**
|
|
* Remove a specific channel in the channel list.
|
|
*
|
|
* @param ch Pointer to channel struct to be released.
|
|
*/
|
|
static void
|
|
channel_remove(struct channel *ch)
|
|
{
|
|
struct channel **c = &channels;
|
|
|
|
DBF_TEXT(trace, 2, __FUNCTION__);
|
|
if (ch == NULL)
|
|
return;
|
|
|
|
channel_free(ch);
|
|
while (*c) {
|
|
if (*c == ch) {
|
|
*c = ch->next;
|
|
fsm_deltimer(&ch->timer);
|
|
kfree_fsm(ch->fsm);
|
|
clear_normalized_cda(&ch->ccw[4]);
|
|
if (ch->trans_skb != NULL) {
|
|
clear_normalized_cda(&ch->ccw[1]);
|
|
dev_kfree_skb(ch->trans_skb);
|
|
}
|
|
kfree(ch->ccw);
|
|
kfree(ch->irb);
|
|
kfree(ch);
|
|
return;
|
|
}
|
|
c = &((*c)->next);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get a specific channel from the channel list.
|
|
*
|
|
* @param type Type of channel we are interested in.
|
|
* @param id Id of channel we are interested in.
|
|
* @param direction Direction we want to use this channel for.
|
|
*
|
|
* @return Pointer to a channel or NULL if no matching channel available.
|
|
*/
|
|
static struct channel
|
|
*
|
|
channel_get(enum channel_types type, char *id, int direction)
|
|
{
|
|
struct channel *ch = channels;
|
|
|
|
DBF_TEXT(trace, 3, __FUNCTION__);
|
|
#ifdef DEBUG
|
|
ctc_pr_debug("ctc: %s(): searching for ch with id %s and type %d\n",
|
|
__func__, id, type);
|
|
#endif
|
|
|
|
while (ch && ((strncmp(ch->id, id, CTC_ID_SIZE)) || (ch->type != type))) {
|
|
#ifdef DEBUG
|
|
ctc_pr_debug("ctc: %s(): ch=0x%p (id=%s, type=%d\n",
|
|
__func__, ch, ch->id, ch->type);
|
|
#endif
|
|
ch = ch->next;
|
|
}
|
|
#ifdef DEBUG
|
|
ctc_pr_debug("ctc: %s(): ch=0x%pq (id=%s, type=%d\n",
|
|
__func__, ch, ch->id, ch->type);
|
|
#endif
|
|
if (!ch) {
|
|
ctc_pr_warn("ctc: %s(): channel with id %s "
|
|
"and type %d not found in channel list\n",
|
|
__func__, id, type);
|
|
} else {
|
|
if (ch->flags & CHANNEL_FLAGS_INUSE)
|
|
ch = NULL;
|
|
else {
|
|
ch->flags |= CHANNEL_FLAGS_INUSE;
|
|
ch->flags &= ~CHANNEL_FLAGS_RWMASK;
|
|
ch->flags |= (direction == WRITE)
|
|
? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
|
|
fsm_newstate(ch->fsm, CH_STATE_STOPPED);
|
|
}
|
|
}
|
|
return ch;
|
|
}
|
|
|
|
/**
|
|
* Return the channel type by name.
|
|
*
|
|
* @param name Name of network interface.
|
|
*
|
|
* @return Type class of channel to be used for that interface.
|
|
*/
|
|
static enum channel_types inline
|
|
extract_channel_media(char *name)
|
|
{
|
|
enum channel_types ret = channel_type_unknown;
|
|
|
|
if (name != NULL) {
|
|
if (strncmp(name, "ctc", 3) == 0)
|
|
ret = channel_type_parallel;
|
|
if (strncmp(name, "escon", 5) == 0)
|
|
ret = channel_type_escon;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static long
|
|
__ctc_check_irb_error(struct ccw_device *cdev, struct irb *irb)
|
|
{
|
|
if (!IS_ERR(irb))
|
|
return 0;
|
|
|
|
switch (PTR_ERR(irb)) {
|
|
case -EIO:
|
|
ctc_pr_warn("i/o-error on device %s\n", cdev->dev.bus_id);
|
|
// CTC_DBF_TEXT(trace, 2, "ckirberr");
|
|
// CTC_DBF_TEXT_(trace, 2, " rc%d", -EIO);
|
|
break;
|
|
case -ETIMEDOUT:
|
|
ctc_pr_warn("timeout on device %s\n", cdev->dev.bus_id);
|
|
// CTC_DBF_TEXT(trace, 2, "ckirberr");
|
|
// CTC_DBF_TEXT_(trace, 2, " rc%d", -ETIMEDOUT);
|
|
break;
|
|
default:
|
|
ctc_pr_warn("unknown error %ld on device %s\n", PTR_ERR(irb),
|
|
cdev->dev.bus_id);
|
|
// CTC_DBF_TEXT(trace, 2, "ckirberr");
|
|
// CTC_DBF_TEXT(trace, 2, " rc???");
|
|
}
|
|
return PTR_ERR(irb);
|
|
}
|
|
|
|
/**
|
|
* Main IRQ handler.
|
|
*
|
|
* @param cdev The ccw_device the interrupt is for.
|
|
* @param intparm interruption parameter.
|
|
* @param irb interruption response block.
|
|
*/
|
|
static void
|
|
ctc_irq_handler(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
|
|
{
|
|
struct channel *ch;
|
|
struct net_device *dev;
|
|
struct ctc_priv *priv;
|
|
|
|
DBF_TEXT(trace, 5, __FUNCTION__);
|
|
if (__ctc_check_irb_error(cdev, irb))
|
|
return;
|
|
|
|
/* Check for unsolicited interrupts. */
|
|
if (!cdev->dev.driver_data) {
|
|
ctc_pr_warn("ctc: Got unsolicited irq: %s c-%02x d-%02x\n",
|
|
cdev->dev.bus_id, irb->scsw.cstat,
|
|
irb->scsw.dstat);
|
|
return;
|
|
}
|
|
|
|
priv = ((struct ccwgroup_device *)cdev->dev.driver_data)
|
|
->dev.driver_data;
|
|
|
|
/* Try to extract channel from driver data. */
|
|
if (priv->channel[READ]->cdev == cdev)
|
|
ch = priv->channel[READ];
|
|
else if (priv->channel[WRITE]->cdev == cdev)
|
|
ch = priv->channel[WRITE];
|
|
else {
|
|
ctc_pr_err("ctc: Can't determine channel for interrupt, "
|
|
"device %s\n", cdev->dev.bus_id);
|
|
return;
|
|
}
|
|
|
|
dev = (struct net_device *) (ch->netdev);
|
|
if (dev == NULL) {
|
|
ctc_pr_crit("ctc: ctc_irq_handler dev=NULL bus_id=%s, ch=0x%p\n",
|
|
cdev->dev.bus_id, ch);
|
|
return;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
ctc_pr_debug("%s: interrupt for device: %s received c-%02x d-%02x\n",
|
|
dev->name, ch->id, irb->scsw.cstat, irb->scsw.dstat);
|
|
#endif
|
|
|
|
/* Copy interruption response block. */
|
|
memcpy(ch->irb, irb, sizeof(struct irb));
|
|
|
|
/* Check for good subchannel return code, otherwise error message */
|
|
if (ch->irb->scsw.cstat) {
|
|
fsm_event(ch->fsm, CH_EVENT_SC_UNKNOWN, ch);
|
|
ctc_pr_warn("%s: subchannel check for device: %s - %02x %02x\n",
|
|
dev->name, ch->id, ch->irb->scsw.cstat,
|
|
ch->irb->scsw.dstat);
|
|
return;
|
|
}
|
|
|
|
/* Check the reason-code of a unit check */
|
|
if (ch->irb->scsw.dstat & DEV_STAT_UNIT_CHECK) {
|
|
ccw_unit_check(ch, ch->irb->ecw[0]);
|
|
return;
|
|
}
|
|
if (ch->irb->scsw.dstat & DEV_STAT_BUSY) {
|
|
if (ch->irb->scsw.dstat & DEV_STAT_ATTENTION)
|
|
fsm_event(ch->fsm, CH_EVENT_ATTNBUSY, ch);
|
|
else
|
|
fsm_event(ch->fsm, CH_EVENT_BUSY, ch);
|
|
return;
|
|
}
|
|
if (ch->irb->scsw.dstat & DEV_STAT_ATTENTION) {
|
|
fsm_event(ch->fsm, CH_EVENT_ATTN, ch);
|
|
return;
|
|
}
|
|
if ((ch->irb->scsw.stctl & SCSW_STCTL_SEC_STATUS) ||
|
|
(ch->irb->scsw.stctl == SCSW_STCTL_STATUS_PEND) ||
|
|
(ch->irb->scsw.stctl ==
|
|
(SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
|
|
fsm_event(ch->fsm, CH_EVENT_FINSTAT, ch);
|
|
else
|
|
fsm_event(ch->fsm, CH_EVENT_IRQ, ch);
|
|
|
|
}
|
|
|
|
/**
|
|
* Actions for interface - statemachine.
|
|
*****************************************************************************/
|
|
|
|
/**
|
|
* Startup channels by sending CH_EVENT_START to each channel.
|
|
*
|
|
* @param fi An instance of an interface statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from struct net_device * upon call.
|
|
*/
|
|
static void
|
|
dev_action_start(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct net_device *dev = (struct net_device *) arg;
|
|
struct ctc_priv *privptr = dev->priv;
|
|
int direction;
|
|
|
|
DBF_TEXT(setup, 3, __FUNCTION__);
|
|
fsm_deltimer(&privptr->restart_timer);
|
|
fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
|
|
for (direction = READ; direction <= WRITE; direction++) {
|
|
struct channel *ch = privptr->channel[direction];
|
|
fsm_event(ch->fsm, CH_EVENT_START, ch);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Shutdown channels by sending CH_EVENT_STOP to each channel.
|
|
*
|
|
* @param fi An instance of an interface statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from struct net_device * upon call.
|
|
*/
|
|
static void
|
|
dev_action_stop(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct net_device *dev = (struct net_device *) arg;
|
|
struct ctc_priv *privptr = dev->priv;
|
|
int direction;
|
|
|
|
DBF_TEXT(trace, 3, __FUNCTION__);
|
|
fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
|
|
for (direction = READ; direction <= WRITE; direction++) {
|
|
struct channel *ch = privptr->channel[direction];
|
|
fsm_event(ch->fsm, CH_EVENT_STOP, ch);
|
|
}
|
|
}
|
|
static void
|
|
dev_action_restart(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
struct net_device *dev = (struct net_device *)arg;
|
|
struct ctc_priv *privptr = dev->priv;
|
|
|
|
DBF_TEXT(trace, 3, __FUNCTION__);
|
|
ctc_pr_debug("%s: Restarting\n", dev->name);
|
|
dev_action_stop(fi, event, arg);
|
|
fsm_event(privptr->fsm, DEV_EVENT_STOP, dev);
|
|
fsm_addtimer(&privptr->restart_timer, CTC_TIMEOUT_5SEC,
|
|
DEV_EVENT_START, dev);
|
|
}
|
|
|
|
/**
|
|
* Called from channel statemachine
|
|
* when a channel is up and running.
|
|
*
|
|
* @param fi An instance of an interface statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from struct net_device * upon call.
|
|
*/
|
|
static void
|
|
dev_action_chup(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
struct net_device *dev = (struct net_device *) arg;
|
|
|
|
DBF_TEXT(trace, 3, __FUNCTION__);
|
|
switch (fsm_getstate(fi)) {
|
|
case DEV_STATE_STARTWAIT_RXTX:
|
|
if (event == DEV_EVENT_RXUP)
|
|
fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
|
|
else
|
|
fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
|
|
break;
|
|
case DEV_STATE_STARTWAIT_RX:
|
|
if (event == DEV_EVENT_RXUP) {
|
|
fsm_newstate(fi, DEV_STATE_RUNNING);
|
|
ctc_pr_info("%s: connected with remote side\n",
|
|
dev->name);
|
|
ctc_clear_busy(dev);
|
|
}
|
|
break;
|
|
case DEV_STATE_STARTWAIT_TX:
|
|
if (event == DEV_EVENT_TXUP) {
|
|
fsm_newstate(fi, DEV_STATE_RUNNING);
|
|
ctc_pr_info("%s: connected with remote side\n",
|
|
dev->name);
|
|
ctc_clear_busy(dev);
|
|
}
|
|
break;
|
|
case DEV_STATE_STOPWAIT_TX:
|
|
if (event == DEV_EVENT_RXUP)
|
|
fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
|
|
break;
|
|
case DEV_STATE_STOPWAIT_RX:
|
|
if (event == DEV_EVENT_TXUP)
|
|
fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Called from channel statemachine
|
|
* when a channel has been shutdown.
|
|
*
|
|
* @param fi An instance of an interface statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from struct net_device * upon call.
|
|
*/
|
|
static void
|
|
dev_action_chdown(fsm_instance * fi, int event, void *arg)
|
|
{
|
|
|
|
DBF_TEXT(trace, 3, __FUNCTION__);
|
|
switch (fsm_getstate(fi)) {
|
|
case DEV_STATE_RUNNING:
|
|
if (event == DEV_EVENT_TXDOWN)
|
|
fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
|
|
else
|
|
fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
|
|
break;
|
|
case DEV_STATE_STARTWAIT_RX:
|
|
if (event == DEV_EVENT_TXDOWN)
|
|
fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
|
|
break;
|
|
case DEV_STATE_STARTWAIT_TX:
|
|
if (event == DEV_EVENT_RXDOWN)
|
|
fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
|
|
break;
|
|
case DEV_STATE_STOPWAIT_RXTX:
|
|
if (event == DEV_EVENT_TXDOWN)
|
|
fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
|
|
else
|
|
fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
|
|
break;
|
|
case DEV_STATE_STOPWAIT_RX:
|
|
if (event == DEV_EVENT_RXDOWN)
|
|
fsm_newstate(fi, DEV_STATE_STOPPED);
|
|
break;
|
|
case DEV_STATE_STOPWAIT_TX:
|
|
if (event == DEV_EVENT_TXDOWN)
|
|
fsm_newstate(fi, DEV_STATE_STOPPED);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static const fsm_node dev_fsm[] = {
|
|
{DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start},
|
|
|
|
{DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start },
|
|
{DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
|
|
{DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
|
|
{DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
|
|
|
|
{DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start },
|
|
{DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
|
|
{DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
|
|
{DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown },
|
|
{DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
|
|
|
|
{DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start },
|
|
{DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
|
|
{DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
|
|
{DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown },
|
|
{DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
|
|
|
|
{DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop },
|
|
{DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup },
|
|
{DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup },
|
|
{DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
|
|
{DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
|
|
{DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
|
|
|
|
{DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop },
|
|
{DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
|
|
{DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
|
|
{DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown },
|
|
{DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
|
|
|
|
{DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop },
|
|
{DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
|
|
{DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
|
|
{DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown },
|
|
{DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
|
|
|
|
{DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop },
|
|
{DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown },
|
|
{DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown },
|
|
{DEV_STATE_RUNNING, DEV_EVENT_TXUP, fsm_action_nop },
|
|
{DEV_STATE_RUNNING, DEV_EVENT_RXUP, fsm_action_nop },
|
|
{DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart },
|
|
};
|
|
|
|
static const int DEV_FSM_LEN = sizeof (dev_fsm) / sizeof (fsm_node);
|
|
|
|
/**
|
|
* Transmit a packet.
|
|
* This is a helper function for ctc_tx().
|
|
*
|
|
* @param ch Channel to be used for sending.
|
|
* @param skb Pointer to struct sk_buff of packet to send.
|
|
* The linklevel header has already been set up
|
|
* by ctc_tx().
|
|
*
|
|
* @return 0 on success, -ERRNO on failure. (Never fails.)
|
|
*/
|
|
static int
|
|
transmit_skb(struct channel *ch, struct sk_buff *skb)
|
|
{
|
|
unsigned long saveflags;
|
|
struct ll_header header;
|
|
int rc = 0;
|
|
|
|
DBF_TEXT(trace, 5, __FUNCTION__);
|
|
/* we need to acquire the lock for testing the state
|
|
* otherwise we can have an IRQ changing the state to
|
|
* TXIDLE after the test but before acquiring the lock.
|
|
*/
|
|
spin_lock_irqsave(&ch->collect_lock, saveflags);
|
|
if (fsm_getstate(ch->fsm) != CH_STATE_TXIDLE) {
|
|
int l = skb->len + LL_HEADER_LENGTH;
|
|
|
|
if (ch->collect_len + l > ch->max_bufsize - 2) {
|
|
spin_unlock_irqrestore(&ch->collect_lock, saveflags);
|
|
return -EBUSY;
|
|
} else {
|
|
atomic_inc(&skb->users);
|
|
header.length = l;
|
|
header.type = skb->protocol;
|
|
header.unused = 0;
|
|
memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
|
|
LL_HEADER_LENGTH);
|
|
skb_queue_tail(&ch->collect_queue, skb);
|
|
ch->collect_len += l;
|
|
}
|
|
spin_unlock_irqrestore(&ch->collect_lock, saveflags);
|
|
} else {
|
|
__u16 block_len;
|
|
int ccw_idx;
|
|
struct sk_buff *nskb;
|
|
unsigned long hi;
|
|
spin_unlock_irqrestore(&ch->collect_lock, saveflags);
|
|
/**
|
|
* Protect skb against beeing free'd by upper
|
|
* layers.
|
|
*/
|
|
atomic_inc(&skb->users);
|
|
ch->prof.txlen += skb->len;
|
|
header.length = skb->len + LL_HEADER_LENGTH;
|
|
header.type = skb->protocol;
|
|
header.unused = 0;
|
|
memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
|
|
LL_HEADER_LENGTH);
|
|
block_len = skb->len + 2;
|
|
*((__u16 *) skb_push(skb, 2)) = block_len;
|
|
|
|
/**
|
|
* IDAL support in CTC is broken, so we have to
|
|
* care about skb's above 2G ourselves.
|
|
*/
|
|
hi = ((unsigned long)skb_tail_pointer(skb) +
|
|
LL_HEADER_LENGTH) >> 31;
|
|
if (hi) {
|
|
nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
|
|
if (!nskb) {
|
|
atomic_dec(&skb->users);
|
|
skb_pull(skb, LL_HEADER_LENGTH + 2);
|
|
ctc_clear_busy(ch->netdev);
|
|
return -ENOMEM;
|
|
} else {
|
|
memcpy(skb_put(nskb, skb->len),
|
|
skb->data, skb->len);
|
|
atomic_inc(&nskb->users);
|
|
atomic_dec(&skb->users);
|
|
dev_kfree_skb_irq(skb);
|
|
skb = nskb;
|
|
}
|
|
}
|
|
|
|
ch->ccw[4].count = block_len;
|
|
if (set_normalized_cda(&ch->ccw[4], skb->data)) {
|
|
/**
|
|
* idal allocation failed, try via copying to
|
|
* trans_skb. trans_skb usually has a pre-allocated
|
|
* idal.
|
|
*/
|
|
if (ctc_checkalloc_buffer(ch, 1)) {
|
|
/**
|
|
* Remove our header. It gets added
|
|
* again on retransmit.
|
|
*/
|
|
atomic_dec(&skb->users);
|
|
skb_pull(skb, LL_HEADER_LENGTH + 2);
|
|
ctc_clear_busy(ch->netdev);
|
|
return -EBUSY;
|
|
}
|
|
|
|
skb_reset_tail_pointer(ch->trans_skb);
|
|
ch->trans_skb->len = 0;
|
|
ch->ccw[1].count = skb->len;
|
|
skb_copy_from_linear_data(skb, skb_put(ch->trans_skb,
|
|
skb->len),
|
|
skb->len);
|
|
atomic_dec(&skb->users);
|
|
dev_kfree_skb_irq(skb);
|
|
ccw_idx = 0;
|
|
} else {
|
|
skb_queue_tail(&ch->io_queue, skb);
|
|
ccw_idx = 3;
|
|
}
|
|
ch->retry = 0;
|
|
fsm_newstate(ch->fsm, CH_STATE_TX);
|
|
fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch);
|
|
spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
|
|
ch->prof.send_stamp = current_kernel_time();
|
|
rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
|
|
(unsigned long) ch, 0xff, 0);
|
|
spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
|
|
if (ccw_idx == 3)
|
|
ch->prof.doios_single++;
|
|
if (rc != 0) {
|
|
fsm_deltimer(&ch->timer);
|
|
ccw_check_return_code(ch, rc, "single skb TX");
|
|
if (ccw_idx == 3)
|
|
skb_dequeue_tail(&ch->io_queue);
|
|
/**
|
|
* Remove our header. It gets added
|
|
* again on retransmit.
|
|
*/
|
|
skb_pull(skb, LL_HEADER_LENGTH + 2);
|
|
} else {
|
|
if (ccw_idx == 0) {
|
|
struct net_device *dev = ch->netdev;
|
|
struct ctc_priv *privptr = dev->priv;
|
|
privptr->stats.tx_packets++;
|
|
privptr->stats.tx_bytes +=
|
|
skb->len - LL_HEADER_LENGTH;
|
|
}
|
|
}
|
|
}
|
|
|
|
ctc_clear_busy(ch->netdev);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* Interface API for upper network layers
|
|
*****************************************************************************/
|
|
|
|
/**
|
|
* Open an interface.
|
|
* Called from generic network layer when ifconfig up is run.
|
|
*
|
|
* @param dev Pointer to interface struct.
|
|
*
|
|
* @return 0 on success, -ERRNO on failure. (Never fails.)
|
|
*/
|
|
static int
|
|
ctc_open(struct net_device * dev)
|
|
{
|
|
DBF_TEXT(trace, 5, __FUNCTION__);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_START, dev);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Close an interface.
|
|
* Called from generic network layer when ifconfig down is run.
|
|
*
|
|
* @param dev Pointer to interface struct.
|
|
*
|
|
* @return 0 on success, -ERRNO on failure. (Never fails.)
|
|
*/
|
|
static int
|
|
ctc_close(struct net_device * dev)
|
|
{
|
|
DBF_TEXT(trace, 5, __FUNCTION__);
|
|
fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_STOP, dev);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Start transmission of a packet.
|
|
* Called from generic network device layer.
|
|
*
|
|
* @param skb Pointer to buffer containing the packet.
|
|
* @param dev Pointer to interface struct.
|
|
*
|
|
* @return 0 if packet consumed, !0 if packet rejected.
|
|
* Note: If we return !0, then the packet is free'd by
|
|
* the generic network layer.
|
|
*/
|
|
static int
|
|
ctc_tx(struct sk_buff *skb, struct net_device * dev)
|
|
{
|
|
int rc = 0;
|
|
struct ctc_priv *privptr = (struct ctc_priv *) dev->priv;
|
|
|
|
DBF_TEXT(trace, 5, __FUNCTION__);
|
|
/**
|
|
* Some sanity checks ...
|
|
*/
|
|
if (skb == NULL) {
|
|
ctc_pr_warn("%s: NULL sk_buff passed\n", dev->name);
|
|
privptr->stats.tx_dropped++;
|
|
return 0;
|
|
}
|
|
if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
|
|
ctc_pr_warn("%s: Got sk_buff with head room < %ld bytes\n",
|
|
dev->name, LL_HEADER_LENGTH + 2);
|
|
dev_kfree_skb(skb);
|
|
privptr->stats.tx_dropped++;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* If channels are not running, try to restart them
|
|
* and throw away packet.
|
|
*/
|
|
if (fsm_getstate(privptr->fsm) != DEV_STATE_RUNNING) {
|
|
fsm_event(privptr->fsm, DEV_EVENT_START, dev);
|
|
dev_kfree_skb(skb);
|
|
privptr->stats.tx_dropped++;
|
|
privptr->stats.tx_errors++;
|
|
privptr->stats.tx_carrier_errors++;
|
|
return 0;
|
|
}
|
|
|
|
if (ctc_test_and_set_busy(dev))
|
|
return -EBUSY;
|
|
|
|
dev->trans_start = jiffies;
|
|
if (transmit_skb(privptr->channel[WRITE], skb) != 0)
|
|
rc = 1;
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* Sets MTU of an interface.
|
|
*
|
|
* @param dev Pointer to interface struct.
|
|
* @param new_mtu The new MTU to use for this interface.
|
|
*
|
|
* @return 0 on success, -EINVAL if MTU is out of valid range.
|
|
* (valid range is 576 .. 65527). If VM is on the
|
|
* remote side, maximum MTU is 32760, however this is
|
|
* <em>not</em> checked here.
|
|
*/
|
|
static int
|
|
ctc_change_mtu(struct net_device * dev, int new_mtu)
|
|
{
|
|
struct ctc_priv *privptr = (struct ctc_priv *) dev->priv;
|
|
|
|
DBF_TEXT(trace, 3, __FUNCTION__);
|
|
if ((new_mtu < 576) || (new_mtu > 65527) ||
|
|
(new_mtu > (privptr->channel[READ]->max_bufsize -
|
|
LL_HEADER_LENGTH - 2)))
|
|
return -EINVAL;
|
|
dev->mtu = new_mtu;
|
|
dev->hard_header_len = LL_HEADER_LENGTH + 2;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Returns interface statistics of a device.
|
|
*
|
|
* @param dev Pointer to interface struct.
|
|
*
|
|
* @return Pointer to stats struct of this interface.
|
|
*/
|
|
static struct net_device_stats *
|
|
ctc_stats(struct net_device * dev)
|
|
{
|
|
return &((struct ctc_priv *) dev->priv)->stats;
|
|
}
|
|
|
|
/*
|
|
* sysfs attributes
|
|
*/
|
|
|
|
static ssize_t
|
|
buffer_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ctc_priv *priv;
|
|
|
|
priv = dev->driver_data;
|
|
if (!priv)
|
|
return -ENODEV;
|
|
return sprintf(buf, "%d\n",
|
|
priv->buffer_size);
|
|
}
|
|
|
|
static ssize_t
|
|
buffer_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct ctc_priv *priv;
|
|
struct net_device *ndev;
|
|
int bs1;
|
|
char buffer[16];
|
|
|
|
DBF_TEXT(trace, 3, __FUNCTION__);
|
|
DBF_TEXT(trace, 3, buf);
|
|
priv = dev->driver_data;
|
|
if (!priv) {
|
|
DBF_TEXT(trace, 3, "bfnopriv");
|
|
return -ENODEV;
|
|
}
|
|
|
|
sscanf(buf, "%u", &bs1);
|
|
if (bs1 > CTC_BUFSIZE_LIMIT)
|
|
goto einval;
|
|
if (bs1 < (576 + LL_HEADER_LENGTH + 2))
|
|
goto einval;
|
|
priv->buffer_size = bs1; // just to overwrite the default
|
|
|
|
ndev = priv->channel[READ]->netdev;
|
|
if (!ndev) {
|
|
DBF_TEXT(trace, 3, "bfnondev");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if ((ndev->flags & IFF_RUNNING) &&
|
|
(bs1 < (ndev->mtu + LL_HEADER_LENGTH + 2)))
|
|
goto einval;
|
|
|
|
priv->channel[READ]->max_bufsize = bs1;
|
|
priv->channel[WRITE]->max_bufsize = bs1;
|
|
if (!(ndev->flags & IFF_RUNNING))
|
|
ndev->mtu = bs1 - LL_HEADER_LENGTH - 2;
|
|
priv->channel[READ]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;
|
|
priv->channel[WRITE]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;
|
|
|
|
sprintf(buffer, "%d",priv->buffer_size);
|
|
DBF_TEXT(trace, 3, buffer);
|
|
return count;
|
|
|
|
einval:
|
|
DBF_TEXT(trace, 3, "buff_err");
|
|
return -EINVAL;
|
|
}
|
|
|
|
static ssize_t
|
|
loglevel_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", loglevel);
|
|
}
|
|
|
|
static ssize_t
|
|
loglevel_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
int ll1;
|
|
|
|
DBF_TEXT(trace, 5, __FUNCTION__);
|
|
sscanf(buf, "%i", &ll1);
|
|
|
|
if ((ll1 > CTC_LOGLEVEL_MAX) || (ll1 < 0))
|
|
return -EINVAL;
|
|
loglevel = ll1;
|
|
return count;
|
|
}
|
|
|
|
static void
|
|
ctc_print_statistics(struct ctc_priv *priv)
|
|
{
|
|
char *sbuf;
|
|
char *p;
|
|
|
|
DBF_TEXT(trace, 4, __FUNCTION__);
|
|
if (!priv)
|
|
return;
|
|
sbuf = kmalloc(2048, GFP_KERNEL);
|
|
if (sbuf == NULL)
|
|
return;
|
|
p = sbuf;
|
|
|
|
p += sprintf(p, " Device FSM state: %s\n",
|
|
fsm_getstate_str(priv->fsm));
|
|
p += sprintf(p, " RX channel FSM state: %s\n",
|
|
fsm_getstate_str(priv->channel[READ]->fsm));
|
|
p += sprintf(p, " TX channel FSM state: %s\n",
|
|
fsm_getstate_str(priv->channel[WRITE]->fsm));
|
|
p += sprintf(p, " Max. TX buffer used: %ld\n",
|
|
priv->channel[WRITE]->prof.maxmulti);
|
|
p += sprintf(p, " Max. chained SKBs: %ld\n",
|
|
priv->channel[WRITE]->prof.maxcqueue);
|
|
p += sprintf(p, " TX single write ops: %ld\n",
|
|
priv->channel[WRITE]->prof.doios_single);
|
|
p += sprintf(p, " TX multi write ops: %ld\n",
|
|
priv->channel[WRITE]->prof.doios_multi);
|
|
p += sprintf(p, " Netto bytes written: %ld\n",
|
|
priv->channel[WRITE]->prof.txlen);
|
|
p += sprintf(p, " Max. TX IO-time: %ld\n",
|
|
priv->channel[WRITE]->prof.tx_time);
|
|
|
|
ctc_pr_debug("Statistics for %s:\n%s",
|
|
priv->channel[WRITE]->netdev->name, sbuf);
|
|
kfree(sbuf);
|
|
return;
|
|
}
|
|
|
|
static ssize_t
|
|
stats_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ctc_priv *priv = dev->driver_data;
|
|
if (!priv)
|
|
return -ENODEV;
|
|
ctc_print_statistics(priv);
|
|
return sprintf(buf, "0\n");
|
|
}
|
|
|
|
static ssize_t
|
|
stats_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct ctc_priv *priv = dev->driver_data;
|
|
if (!priv)
|
|
return -ENODEV;
|
|
/* Reset statistics */
|
|
memset(&priv->channel[WRITE]->prof, 0,
|
|
sizeof(priv->channel[WRITE]->prof));
|
|
return count;
|
|
}
|
|
|
|
static void
|
|
ctc_netdev_unregister(struct net_device * dev)
|
|
{
|
|
struct ctc_priv *privptr;
|
|
|
|
if (!dev)
|
|
return;
|
|
privptr = (struct ctc_priv *) dev->priv;
|
|
unregister_netdev(dev);
|
|
}
|
|
|
|
static int
|
|
ctc_netdev_register(struct net_device * dev)
|
|
{
|
|
return register_netdev(dev);
|
|
}
|
|
|
|
static void
|
|
ctc_free_netdevice(struct net_device * dev, int free_dev)
|
|
{
|
|
struct ctc_priv *privptr;
|
|
if (!dev)
|
|
return;
|
|
privptr = dev->priv;
|
|
if (privptr) {
|
|
if (privptr->fsm)
|
|
kfree_fsm(privptr->fsm);
|
|
kfree(privptr);
|
|
}
|
|
#ifdef MODULE
|
|
if (free_dev)
|
|
free_netdev(dev);
|
|
#endif
|
|
}
|
|
|
|
static ssize_t
|
|
ctc_proto_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ctc_priv *priv;
|
|
|
|
priv = dev->driver_data;
|
|
if (!priv)
|
|
return -ENODEV;
|
|
|
|
return sprintf(buf, "%d\n", priv->protocol);
|
|
}
|
|
|
|
static ssize_t
|
|
ctc_proto_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct ctc_priv *priv;
|
|
int value;
|
|
|
|
DBF_TEXT(trace, 3, __FUNCTION__);
|
|
pr_debug("%s() called\n", __FUNCTION__);
|
|
|
|
priv = dev->driver_data;
|
|
if (!priv)
|
|
return -ENODEV;
|
|
sscanf(buf, "%u", &value);
|
|
if (!((value == CTC_PROTO_S390) ||
|
|
(value == CTC_PROTO_LINUX) ||
|
|
(value == CTC_PROTO_OS390)))
|
|
return -EINVAL;
|
|
priv->protocol = value;
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t
|
|
ctc_type_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ccwgroup_device *cgdev;
|
|
|
|
cgdev = to_ccwgroupdev(dev);
|
|
if (!cgdev)
|
|
return -ENODEV;
|
|
|
|
return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]);
|
|
}
|
|
|
|
static DEVICE_ATTR(buffer, 0644, buffer_show, buffer_write);
|
|
static DEVICE_ATTR(protocol, 0644, ctc_proto_show, ctc_proto_store);
|
|
static DEVICE_ATTR(type, 0444, ctc_type_show, NULL);
|
|
|
|
static DEVICE_ATTR(loglevel, 0644, loglevel_show, loglevel_write);
|
|
static DEVICE_ATTR(stats, 0644, stats_show, stats_write);
|
|
|
|
static struct attribute *ctc_attr[] = {
|
|
&dev_attr_protocol.attr,
|
|
&dev_attr_type.attr,
|
|
&dev_attr_buffer.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group ctc_attr_group = {
|
|
.attrs = ctc_attr,
|
|
};
|
|
|
|
static int
|
|
ctc_add_attributes(struct device *dev)
|
|
{
|
|
int rc;
|
|
|
|
rc = device_create_file(dev, &dev_attr_loglevel);
|
|
if (rc)
|
|
goto out;
|
|
rc = device_create_file(dev, &dev_attr_stats);
|
|
if (!rc)
|
|
goto out;
|
|
device_remove_file(dev, &dev_attr_loglevel);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static void
|
|
ctc_remove_attributes(struct device *dev)
|
|
{
|
|
device_remove_file(dev, &dev_attr_stats);
|
|
device_remove_file(dev, &dev_attr_loglevel);
|
|
}
|
|
|
|
static int
|
|
ctc_add_files(struct device *dev)
|
|
{
|
|
pr_debug("%s() called\n", __FUNCTION__);
|
|
|
|
return sysfs_create_group(&dev->kobj, &ctc_attr_group);
|
|
}
|
|
|
|
static void
|
|
ctc_remove_files(struct device *dev)
|
|
{
|
|
pr_debug("%s() called\n", __FUNCTION__);
|
|
|
|
sysfs_remove_group(&dev->kobj, &ctc_attr_group);
|
|
}
|
|
|
|
/**
|
|
* Add ctc specific attributes.
|
|
* Add ctc private data.
|
|
*
|
|
* @param cgdev pointer to ccwgroup_device just added
|
|
*
|
|
* @returns 0 on success, !0 on failure.
|
|
*/
|
|
static int
|
|
ctc_probe_device(struct ccwgroup_device *cgdev)
|
|
{
|
|
struct ctc_priv *priv;
|
|
int rc;
|
|
char buffer[16];
|
|
|
|
pr_debug("%s() called\n", __FUNCTION__);
|
|
DBF_TEXT(setup, 3, __FUNCTION__);
|
|
|
|
if (!get_device(&cgdev->dev))
|
|
return -ENODEV;
|
|
|
|
priv = kzalloc(sizeof(struct ctc_priv), GFP_KERNEL);
|
|
if (!priv) {
|
|
ctc_pr_err("%s: Out of memory\n", __func__);
|
|
put_device(&cgdev->dev);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
rc = ctc_add_files(&cgdev->dev);
|
|
if (rc) {
|
|
kfree(priv);
|
|
put_device(&cgdev->dev);
|
|
return rc;
|
|
}
|
|
priv->buffer_size = CTC_BUFSIZE_DEFAULT;
|
|
cgdev->cdev[0]->handler = ctc_irq_handler;
|
|
cgdev->cdev[1]->handler = ctc_irq_handler;
|
|
cgdev->dev.driver_data = priv;
|
|
|
|
sprintf(buffer, "%p", priv);
|
|
DBF_TEXT(data, 3, buffer);
|
|
|
|
sprintf(buffer, "%u", (unsigned int)sizeof(struct ctc_priv));
|
|
DBF_TEXT(data, 3, buffer);
|
|
|
|
sprintf(buffer, "%p", &channels);
|
|
DBF_TEXT(data, 3, buffer);
|
|
|
|
sprintf(buffer, "%u", (unsigned int)sizeof(struct channel));
|
|
DBF_TEXT(data, 3, buffer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Device setup function called by alloc_netdev().
|
|
*
|
|
* @param dev Device to be setup.
|
|
*/
|
|
void ctc_init_netdevice(struct net_device * dev)
|
|
{
|
|
DBF_TEXT(setup, 3, __FUNCTION__);
|
|
|
|
if (dev->mtu == 0)
|
|
dev->mtu = CTC_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
|
|
dev->hard_start_xmit = ctc_tx;
|
|
dev->open = ctc_open;
|
|
dev->stop = ctc_close;
|
|
dev->get_stats = ctc_stats;
|
|
dev->change_mtu = ctc_change_mtu;
|
|
dev->hard_header_len = LL_HEADER_LENGTH + 2;
|
|
dev->addr_len = 0;
|
|
dev->type = ARPHRD_SLIP;
|
|
dev->tx_queue_len = 100;
|
|
dev->flags = IFF_POINTOPOINT | IFF_NOARP;
|
|
}
|
|
|
|
|
|
/**
|
|
*
|
|
* Setup an interface.
|
|
*
|
|
* @param cgdev Device to be setup.
|
|
*
|
|
* @returns 0 on success, !0 on failure.
|
|
*/
|
|
static int
|
|
ctc_new_device(struct ccwgroup_device *cgdev)
|
|
{
|
|
char read_id[CTC_ID_SIZE];
|
|
char write_id[CTC_ID_SIZE];
|
|
int direction;
|
|
enum channel_types type;
|
|
struct ctc_priv *privptr;
|
|
struct net_device *dev;
|
|
int ret;
|
|
char buffer[16];
|
|
|
|
pr_debug("%s() called\n", __FUNCTION__);
|
|
DBF_TEXT(setup, 3, __FUNCTION__);
|
|
|
|
privptr = cgdev->dev.driver_data;
|
|
if (!privptr)
|
|
return -ENODEV;
|
|
|
|
sprintf(buffer, "%d", privptr->buffer_size);
|
|
DBF_TEXT(setup, 3, buffer);
|
|
|
|
type = get_channel_type(&cgdev->cdev[0]->id);
|
|
|
|
snprintf(read_id, CTC_ID_SIZE, "ch-%s", cgdev->cdev[0]->dev.bus_id);
|
|
snprintf(write_id, CTC_ID_SIZE, "ch-%s", cgdev->cdev[1]->dev.bus_id);
|
|
|
|
if (add_channel(cgdev->cdev[0], type))
|
|
return -ENOMEM;
|
|
if (add_channel(cgdev->cdev[1], type))
|
|
return -ENOMEM;
|
|
|
|
ret = ccw_device_set_online(cgdev->cdev[0]);
|
|
if (ret != 0) {
|
|
printk(KERN_WARNING
|
|
"ccw_device_set_online (cdev[0]) failed with ret = %d\n", ret);
|
|
}
|
|
|
|
ret = ccw_device_set_online(cgdev->cdev[1]);
|
|
if (ret != 0) {
|
|
printk(KERN_WARNING
|
|
"ccw_device_set_online (cdev[1]) failed with ret = %d\n", ret);
|
|
}
|
|
|
|
dev = alloc_netdev(0, "ctc%d", ctc_init_netdevice);
|
|
if (!dev) {
|
|
ctc_pr_warn("ctc_init_netdevice failed\n");
|
|
goto out;
|
|
}
|
|
dev->priv = privptr;
|
|
|
|
privptr->fsm = init_fsm("ctcdev", dev_state_names,
|
|
dev_event_names, CTC_NR_DEV_STATES, CTC_NR_DEV_EVENTS,
|
|
dev_fsm, DEV_FSM_LEN, GFP_KERNEL);
|
|
if (privptr->fsm == NULL) {
|
|
free_netdev(dev);
|
|
goto out;
|
|
}
|
|
fsm_newstate(privptr->fsm, DEV_STATE_STOPPED);
|
|
fsm_settimer(privptr->fsm, &privptr->restart_timer);
|
|
|
|
for (direction = READ; direction <= WRITE; direction++) {
|
|
privptr->channel[direction] =
|
|
channel_get(type, direction == READ ? read_id : write_id,
|
|
direction);
|
|
if (privptr->channel[direction] == NULL) {
|
|
if (direction == WRITE)
|
|
channel_free(privptr->channel[READ]);
|
|
|
|
ctc_free_netdevice(dev, 1);
|
|
goto out;
|
|
}
|
|
privptr->channel[direction]->netdev = dev;
|
|
privptr->channel[direction]->protocol = privptr->protocol;
|
|
privptr->channel[direction]->max_bufsize = privptr->buffer_size;
|
|
}
|
|
/* sysfs magic */
|
|
SET_NETDEV_DEV(dev, &cgdev->dev);
|
|
|
|
if (ctc_netdev_register(dev) != 0) {
|
|
ctc_free_netdevice(dev, 1);
|
|
goto out;
|
|
}
|
|
|
|
if (ctc_add_attributes(&cgdev->dev)) {
|
|
ctc_netdev_unregister(dev);
|
|
dev->priv = NULL;
|
|
ctc_free_netdevice(dev, 1);
|
|
goto out;
|
|
}
|
|
|
|
strlcpy(privptr->fsm->name, dev->name, sizeof (privptr->fsm->name));
|
|
|
|
print_banner();
|
|
|
|
ctc_pr_info("%s: read: %s, write: %s, proto: %d\n",
|
|
dev->name, privptr->channel[READ]->id,
|
|
privptr->channel[WRITE]->id, privptr->protocol);
|
|
|
|
return 0;
|
|
out:
|
|
ccw_device_set_offline(cgdev->cdev[1]);
|
|
ccw_device_set_offline(cgdev->cdev[0]);
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
/**
|
|
* Shutdown an interface.
|
|
*
|
|
* @param cgdev Device to be shut down.
|
|
*
|
|
* @returns 0 on success, !0 on failure.
|
|
*/
|
|
static int
|
|
ctc_shutdown_device(struct ccwgroup_device *cgdev)
|
|
{
|
|
struct ctc_priv *priv;
|
|
struct net_device *ndev;
|
|
|
|
DBF_TEXT(setup, 3, __FUNCTION__);
|
|
pr_debug("%s() called\n", __FUNCTION__);
|
|
|
|
|
|
priv = cgdev->dev.driver_data;
|
|
ndev = NULL;
|
|
if (!priv)
|
|
return -ENODEV;
|
|
|
|
if (priv->channel[READ]) {
|
|
ndev = priv->channel[READ]->netdev;
|
|
|
|
/* Close the device */
|
|
ctc_close(ndev);
|
|
ndev->flags &=~IFF_RUNNING;
|
|
|
|
ctc_remove_attributes(&cgdev->dev);
|
|
|
|
channel_free(priv->channel[READ]);
|
|
}
|
|
if (priv->channel[WRITE])
|
|
channel_free(priv->channel[WRITE]);
|
|
|
|
if (ndev) {
|
|
ctc_netdev_unregister(ndev);
|
|
ndev->priv = NULL;
|
|
ctc_free_netdevice(ndev, 1);
|
|
}
|
|
|
|
if (priv->fsm)
|
|
kfree_fsm(priv->fsm);
|
|
|
|
ccw_device_set_offline(cgdev->cdev[1]);
|
|
ccw_device_set_offline(cgdev->cdev[0]);
|
|
|
|
if (priv->channel[READ])
|
|
channel_remove(priv->channel[READ]);
|
|
if (priv->channel[WRITE])
|
|
channel_remove(priv->channel[WRITE]);
|
|
priv->channel[READ] = priv->channel[WRITE] = NULL;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static void
|
|
ctc_remove_device(struct ccwgroup_device *cgdev)
|
|
{
|
|
struct ctc_priv *priv;
|
|
|
|
pr_debug("%s() called\n", __FUNCTION__);
|
|
DBF_TEXT(setup, 3, __FUNCTION__);
|
|
|
|
priv = cgdev->dev.driver_data;
|
|
if (!priv)
|
|
return;
|
|
if (cgdev->state == CCWGROUP_ONLINE)
|
|
ctc_shutdown_device(cgdev);
|
|
ctc_remove_files(&cgdev->dev);
|
|
cgdev->dev.driver_data = NULL;
|
|
kfree(priv);
|
|
put_device(&cgdev->dev);
|
|
}
|
|
|
|
static struct ccwgroup_driver ctc_group_driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ctc",
|
|
.max_slaves = 2,
|
|
.driver_id = 0xC3E3C3,
|
|
.probe = ctc_probe_device,
|
|
.remove = ctc_remove_device,
|
|
.set_online = ctc_new_device,
|
|
.set_offline = ctc_shutdown_device,
|
|
};
|
|
|
|
/**
|
|
* Module related routines
|
|
*****************************************************************************/
|
|
|
|
/**
|
|
* Prepare to be unloaded. Free IRQ's and release all resources.
|
|
* This is called just before this module is unloaded. It is
|
|
* <em>not</em> called, if the usage count is !0, so we don't need to check
|
|
* for that.
|
|
*/
|
|
static void __exit
|
|
ctc_exit(void)
|
|
{
|
|
DBF_TEXT(setup, 3, __FUNCTION__);
|
|
unregister_cu3088_discipline(&ctc_group_driver);
|
|
ctc_unregister_dbf_views();
|
|
ctc_pr_info("CTC driver unloaded\n");
|
|
}
|
|
|
|
/**
|
|
* Initialize module.
|
|
* This is called just after the module is loaded.
|
|
*
|
|
* @return 0 on success, !0 on error.
|
|
*/
|
|
static int __init
|
|
ctc_init(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
loglevel = CTC_LOGLEVEL_DEFAULT;
|
|
|
|
DBF_TEXT(setup, 3, __FUNCTION__);
|
|
|
|
print_banner();
|
|
|
|
ret = ctc_register_dbf_views();
|
|
if (ret){
|
|
ctc_pr_crit("ctc_init failed with ctc_register_dbf_views rc = %d\n", ret);
|
|
return ret;
|
|
}
|
|
ret = register_cu3088_discipline(&ctc_group_driver);
|
|
if (ret) {
|
|
ctc_unregister_dbf_views();
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
module_init(ctc_init);
|
|
module_exit(ctc_exit);
|
|
|
|
/* --- This is the END my friend --- */
|