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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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4c13eb6657
One less thing for drivers writers to worry about. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1745 lines
44 KiB
C
1745 lines
44 KiB
C
/* File veth.c created by Kyle A. Lucke on Mon Aug 7 2000. */
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/*
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* IBM eServer iSeries Virtual Ethernet Device Driver
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* Copyright (C) 2001 Kyle A. Lucke (klucke@us.ibm.com), IBM Corp.
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* Substantially cleaned up by:
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* Copyright (C) 2003 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
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* Copyright (C) 2004-2005 Michael Ellerman, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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*
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* This module implements the virtual ethernet device for iSeries LPAR
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* Linux. It uses hypervisor message passing to implement an
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* ethernet-like network device communicating between partitions on
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* the iSeries.
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*
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* The iSeries LPAR hypervisor currently allows for up to 16 different
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* virtual ethernets. These are all dynamically configurable on
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* OS/400 partitions, but dynamic configuration is not supported under
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* Linux yet. An ethXX network device will be created for each
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* virtual ethernet this partition is connected to.
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*
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* - This driver is responsible for routing packets to and from other
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* partitions. The MAC addresses used by the virtual ethernets
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* contains meaning and must not be modified.
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*
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* - Having 2 virtual ethernets to the same remote partition DOES NOT
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* double the available bandwidth. The 2 devices will share the
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* available hypervisor bandwidth.
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*
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* - If you send a packet to your own mac address, it will just be
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* dropped, you won't get it on the receive side.
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*
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* - Multicast is implemented by sending the frame frame to every
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* other partition. It is the responsibility of the receiving
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* partition to filter the addresses desired.
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*
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* Tunable parameters:
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*
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* VETH_NUMBUFFERS: This compile time option defaults to 120. It
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* controls how much memory Linux will allocate per remote partition
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* it is communicating with. It can be thought of as the maximum
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* number of packets outstanding to a remote partition at a time.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/mm.h>
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#include <linux/ethtool.h>
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#include <linux/if_ether.h>
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#include <asm/abs_addr.h>
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#include <asm/iseries/mf.h>
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#include <asm/uaccess.h>
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#include <asm/firmware.h>
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#include <asm/iseries/hv_lp_config.h>
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#include <asm/iseries/hv_types.h>
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#include <asm/iseries/hv_lp_event.h>
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#include <asm/iommu.h>
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#include <asm/vio.h>
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#undef DEBUG
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MODULE_AUTHOR("Kyle Lucke <klucke@us.ibm.com>");
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MODULE_DESCRIPTION("iSeries Virtual ethernet driver");
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MODULE_LICENSE("GPL");
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#define VETH_EVENT_CAP (0)
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#define VETH_EVENT_FRAMES (1)
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#define VETH_EVENT_MONITOR (2)
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#define VETH_EVENT_FRAMES_ACK (3)
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#define VETH_MAX_ACKS_PER_MSG (20)
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#define VETH_MAX_FRAMES_PER_MSG (6)
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struct veth_frames_data {
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u32 addr[VETH_MAX_FRAMES_PER_MSG];
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u16 len[VETH_MAX_FRAMES_PER_MSG];
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u32 eofmask;
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};
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#define VETH_EOF_SHIFT (32-VETH_MAX_FRAMES_PER_MSG)
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struct veth_frames_ack_data {
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u16 token[VETH_MAX_ACKS_PER_MSG];
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};
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struct veth_cap_data {
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u8 caps_version;
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u8 rsvd1;
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u16 num_buffers;
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u16 ack_threshold;
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u16 rsvd2;
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u32 ack_timeout;
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u32 rsvd3;
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u64 rsvd4[3];
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};
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struct veth_lpevent {
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struct HvLpEvent base_event;
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union {
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struct veth_cap_data caps_data;
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struct veth_frames_data frames_data;
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struct veth_frames_ack_data frames_ack_data;
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} u;
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};
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#define DRV_NAME "iseries_veth"
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#define DRV_VERSION "2.0"
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#define VETH_NUMBUFFERS (120)
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#define VETH_ACKTIMEOUT (1000000) /* microseconds */
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#define VETH_MAX_MCAST (12)
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#define VETH_MAX_MTU (9000)
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#if VETH_NUMBUFFERS < 10
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#define ACK_THRESHOLD (1)
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#elif VETH_NUMBUFFERS < 20
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#define ACK_THRESHOLD (4)
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#elif VETH_NUMBUFFERS < 40
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#define ACK_THRESHOLD (10)
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#else
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#define ACK_THRESHOLD (20)
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#endif
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#define VETH_STATE_SHUTDOWN (0x0001)
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#define VETH_STATE_OPEN (0x0002)
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#define VETH_STATE_RESET (0x0004)
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#define VETH_STATE_SENTMON (0x0008)
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#define VETH_STATE_SENTCAPS (0x0010)
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#define VETH_STATE_GOTCAPACK (0x0020)
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#define VETH_STATE_GOTCAPS (0x0040)
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#define VETH_STATE_SENTCAPACK (0x0080)
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#define VETH_STATE_READY (0x0100)
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struct veth_msg {
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struct veth_msg *next;
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struct veth_frames_data data;
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int token;
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int in_use;
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struct sk_buff *skb;
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struct device *dev;
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};
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struct veth_lpar_connection {
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HvLpIndex remote_lp;
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struct delayed_work statemachine_wq;
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struct veth_msg *msgs;
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int num_events;
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struct veth_cap_data local_caps;
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struct kobject kobject;
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struct timer_list ack_timer;
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struct timer_list reset_timer;
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unsigned int reset_timeout;
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unsigned long last_contact;
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int outstanding_tx;
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spinlock_t lock;
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unsigned long state;
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HvLpInstanceId src_inst;
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HvLpInstanceId dst_inst;
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struct veth_lpevent cap_event, cap_ack_event;
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u16 pending_acks[VETH_MAX_ACKS_PER_MSG];
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u32 num_pending_acks;
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int num_ack_events;
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struct veth_cap_data remote_caps;
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u32 ack_timeout;
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struct veth_msg *msg_stack_head;
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};
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struct veth_port {
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struct device *dev;
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struct net_device_stats stats;
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u64 mac_addr;
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HvLpIndexMap lpar_map;
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/* queue_lock protects the stopped_map and dev's queue. */
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spinlock_t queue_lock;
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HvLpIndexMap stopped_map;
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/* mcast_gate protects promiscuous, num_mcast & mcast_addr. */
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rwlock_t mcast_gate;
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int promiscuous;
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int num_mcast;
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u64 mcast_addr[VETH_MAX_MCAST];
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struct kobject kobject;
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};
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static HvLpIndex this_lp;
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static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */
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static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */
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static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev);
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static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *);
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static void veth_wake_queues(struct veth_lpar_connection *cnx);
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static void veth_stop_queues(struct veth_lpar_connection *cnx);
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static void veth_receive(struct veth_lpar_connection *, struct veth_lpevent *);
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static void veth_release_connection(struct kobject *kobject);
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static void veth_timed_ack(unsigned long ptr);
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static void veth_timed_reset(unsigned long ptr);
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/*
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* Utility functions
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*/
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#define veth_info(fmt, args...) \
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printk(KERN_INFO DRV_NAME ": " fmt, ## args)
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#define veth_error(fmt, args...) \
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printk(KERN_ERR DRV_NAME ": Error: " fmt, ## args)
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#ifdef DEBUG
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#define veth_debug(fmt, args...) \
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printk(KERN_DEBUG DRV_NAME ": " fmt, ## args)
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#else
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#define veth_debug(fmt, args...) do {} while (0)
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#endif
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/* You must hold the connection's lock when you call this function. */
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static inline void veth_stack_push(struct veth_lpar_connection *cnx,
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struct veth_msg *msg)
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{
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msg->next = cnx->msg_stack_head;
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cnx->msg_stack_head = msg;
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}
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/* You must hold the connection's lock when you call this function. */
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static inline struct veth_msg *veth_stack_pop(struct veth_lpar_connection *cnx)
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{
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struct veth_msg *msg;
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msg = cnx->msg_stack_head;
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if (msg)
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cnx->msg_stack_head = cnx->msg_stack_head->next;
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return msg;
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}
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/* You must hold the connection's lock when you call this function. */
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static inline int veth_stack_is_empty(struct veth_lpar_connection *cnx)
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{
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return cnx->msg_stack_head == NULL;
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}
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static inline HvLpEvent_Rc
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veth_signalevent(struct veth_lpar_connection *cnx, u16 subtype,
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HvLpEvent_AckInd ackind, HvLpEvent_AckType acktype,
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u64 token,
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u64 data1, u64 data2, u64 data3, u64 data4, u64 data5)
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{
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return HvCallEvent_signalLpEventFast(cnx->remote_lp,
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HvLpEvent_Type_VirtualLan,
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subtype, ackind, acktype,
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cnx->src_inst,
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cnx->dst_inst,
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token, data1, data2, data3,
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data4, data5);
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}
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static inline HvLpEvent_Rc veth_signaldata(struct veth_lpar_connection *cnx,
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u16 subtype, u64 token, void *data)
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{
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u64 *p = (u64 *) data;
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return veth_signalevent(cnx, subtype, HvLpEvent_AckInd_NoAck,
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HvLpEvent_AckType_ImmediateAck,
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token, p[0], p[1], p[2], p[3], p[4]);
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}
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struct veth_allocation {
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struct completion c;
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int num;
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};
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static void veth_complete_allocation(void *parm, int number)
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{
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struct veth_allocation *vc = (struct veth_allocation *)parm;
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vc->num = number;
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complete(&vc->c);
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}
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static int veth_allocate_events(HvLpIndex rlp, int number)
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{
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struct veth_allocation vc = { COMPLETION_INITIALIZER(vc.c), 0 };
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mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan,
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sizeof(struct veth_lpevent), number,
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&veth_complete_allocation, &vc);
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wait_for_completion(&vc.c);
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return vc.num;
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}
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/*
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* sysfs support
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*/
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struct veth_cnx_attribute {
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struct attribute attr;
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ssize_t (*show)(struct veth_lpar_connection *, char *buf);
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ssize_t (*store)(struct veth_lpar_connection *, const char *buf);
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};
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static ssize_t veth_cnx_attribute_show(struct kobject *kobj,
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struct attribute *attr, char *buf)
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{
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struct veth_cnx_attribute *cnx_attr;
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struct veth_lpar_connection *cnx;
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cnx_attr = container_of(attr, struct veth_cnx_attribute, attr);
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cnx = container_of(kobj, struct veth_lpar_connection, kobject);
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if (!cnx_attr->show)
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return -EIO;
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return cnx_attr->show(cnx, buf);
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}
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#define CUSTOM_CNX_ATTR(_name, _format, _expression) \
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static ssize_t _name##_show(struct veth_lpar_connection *cnx, char *buf)\
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{ \
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return sprintf(buf, _format, _expression); \
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} \
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struct veth_cnx_attribute veth_cnx_attr_##_name = __ATTR_RO(_name)
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#define SIMPLE_CNX_ATTR(_name) \
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CUSTOM_CNX_ATTR(_name, "%lu\n", (unsigned long)cnx->_name)
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SIMPLE_CNX_ATTR(outstanding_tx);
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SIMPLE_CNX_ATTR(remote_lp);
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SIMPLE_CNX_ATTR(num_events);
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SIMPLE_CNX_ATTR(src_inst);
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SIMPLE_CNX_ATTR(dst_inst);
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SIMPLE_CNX_ATTR(num_pending_acks);
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SIMPLE_CNX_ATTR(num_ack_events);
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CUSTOM_CNX_ATTR(ack_timeout, "%d\n", jiffies_to_msecs(cnx->ack_timeout));
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CUSTOM_CNX_ATTR(reset_timeout, "%d\n", jiffies_to_msecs(cnx->reset_timeout));
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CUSTOM_CNX_ATTR(state, "0x%.4lX\n", cnx->state);
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CUSTOM_CNX_ATTR(last_contact, "%d\n", cnx->last_contact ?
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jiffies_to_msecs(jiffies - cnx->last_contact) : 0);
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#define GET_CNX_ATTR(_name) (&veth_cnx_attr_##_name.attr)
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static struct attribute *veth_cnx_default_attrs[] = {
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GET_CNX_ATTR(outstanding_tx),
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GET_CNX_ATTR(remote_lp),
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GET_CNX_ATTR(num_events),
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GET_CNX_ATTR(reset_timeout),
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GET_CNX_ATTR(last_contact),
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GET_CNX_ATTR(state),
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GET_CNX_ATTR(src_inst),
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GET_CNX_ATTR(dst_inst),
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GET_CNX_ATTR(num_pending_acks),
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GET_CNX_ATTR(num_ack_events),
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GET_CNX_ATTR(ack_timeout),
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NULL
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};
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static struct sysfs_ops veth_cnx_sysfs_ops = {
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.show = veth_cnx_attribute_show
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};
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static struct kobj_type veth_lpar_connection_ktype = {
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.release = veth_release_connection,
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.sysfs_ops = &veth_cnx_sysfs_ops,
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.default_attrs = veth_cnx_default_attrs
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};
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struct veth_port_attribute {
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struct attribute attr;
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ssize_t (*show)(struct veth_port *, char *buf);
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ssize_t (*store)(struct veth_port *, const char *buf);
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};
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static ssize_t veth_port_attribute_show(struct kobject *kobj,
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struct attribute *attr, char *buf)
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{
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struct veth_port_attribute *port_attr;
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struct veth_port *port;
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port_attr = container_of(attr, struct veth_port_attribute, attr);
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port = container_of(kobj, struct veth_port, kobject);
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if (!port_attr->show)
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return -EIO;
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return port_attr->show(port, buf);
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}
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#define CUSTOM_PORT_ATTR(_name, _format, _expression) \
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static ssize_t _name##_show(struct veth_port *port, char *buf) \
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{ \
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return sprintf(buf, _format, _expression); \
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} \
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struct veth_port_attribute veth_port_attr_##_name = __ATTR_RO(_name)
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#define SIMPLE_PORT_ATTR(_name) \
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CUSTOM_PORT_ATTR(_name, "%lu\n", (unsigned long)port->_name)
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SIMPLE_PORT_ATTR(promiscuous);
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SIMPLE_PORT_ATTR(num_mcast);
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CUSTOM_PORT_ATTR(lpar_map, "0x%X\n", port->lpar_map);
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CUSTOM_PORT_ATTR(stopped_map, "0x%X\n", port->stopped_map);
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CUSTOM_PORT_ATTR(mac_addr, "0x%lX\n", port->mac_addr);
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#define GET_PORT_ATTR(_name) (&veth_port_attr_##_name.attr)
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static struct attribute *veth_port_default_attrs[] = {
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GET_PORT_ATTR(mac_addr),
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GET_PORT_ATTR(lpar_map),
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GET_PORT_ATTR(stopped_map),
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GET_PORT_ATTR(promiscuous),
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GET_PORT_ATTR(num_mcast),
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NULL
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};
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static struct sysfs_ops veth_port_sysfs_ops = {
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.show = veth_port_attribute_show
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};
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static struct kobj_type veth_port_ktype = {
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.sysfs_ops = &veth_port_sysfs_ops,
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.default_attrs = veth_port_default_attrs
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};
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/*
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* LPAR connection code
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*/
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static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx)
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{
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schedule_delayed_work(&cnx->statemachine_wq, 0);
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}
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static void veth_take_cap(struct veth_lpar_connection *cnx,
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struct veth_lpevent *event)
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{
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unsigned long flags;
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spin_lock_irqsave(&cnx->lock, flags);
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/* Receiving caps may mean the other end has just come up, so
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* we need to reload the instance ID of the far end */
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cnx->dst_inst =
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HvCallEvent_getTargetLpInstanceId(cnx->remote_lp,
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HvLpEvent_Type_VirtualLan);
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if (cnx->state & VETH_STATE_GOTCAPS) {
|
|
veth_error("Received a second capabilities from LPAR %d.\n",
|
|
cnx->remote_lp);
|
|
event->base_event.xRc = HvLpEvent_Rc_BufferNotAvailable;
|
|
HvCallEvent_ackLpEvent((struct HvLpEvent *) event);
|
|
} else {
|
|
memcpy(&cnx->cap_event, event, sizeof(cnx->cap_event));
|
|
cnx->state |= VETH_STATE_GOTCAPS;
|
|
veth_kick_statemachine(cnx);
|
|
}
|
|
spin_unlock_irqrestore(&cnx->lock, flags);
|
|
}
|
|
|
|
static void veth_take_cap_ack(struct veth_lpar_connection *cnx,
|
|
struct veth_lpevent *event)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&cnx->lock, flags);
|
|
if (cnx->state & VETH_STATE_GOTCAPACK) {
|
|
veth_error("Received a second capabilities ack from LPAR %d.\n",
|
|
cnx->remote_lp);
|
|
} else {
|
|
memcpy(&cnx->cap_ack_event, event,
|
|
sizeof(&cnx->cap_ack_event));
|
|
cnx->state |= VETH_STATE_GOTCAPACK;
|
|
veth_kick_statemachine(cnx);
|
|
}
|
|
spin_unlock_irqrestore(&cnx->lock, flags);
|
|
}
|
|
|
|
static void veth_take_monitor_ack(struct veth_lpar_connection *cnx,
|
|
struct veth_lpevent *event)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&cnx->lock, flags);
|
|
veth_debug("cnx %d: lost connection.\n", cnx->remote_lp);
|
|
|
|
/* Avoid kicking the statemachine once we're shutdown.
|
|
* It's unnecessary and it could break veth_stop_connection(). */
|
|
|
|
if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
|
|
cnx->state |= VETH_STATE_RESET;
|
|
veth_kick_statemachine(cnx);
|
|
}
|
|
spin_unlock_irqrestore(&cnx->lock, flags);
|
|
}
|
|
|
|
static void veth_handle_ack(struct veth_lpevent *event)
|
|
{
|
|
HvLpIndex rlp = event->base_event.xTargetLp;
|
|
struct veth_lpar_connection *cnx = veth_cnx[rlp];
|
|
|
|
BUG_ON(! cnx);
|
|
|
|
switch (event->base_event.xSubtype) {
|
|
case VETH_EVENT_CAP:
|
|
veth_take_cap_ack(cnx, event);
|
|
break;
|
|
case VETH_EVENT_MONITOR:
|
|
veth_take_monitor_ack(cnx, event);
|
|
break;
|
|
default:
|
|
veth_error("Unknown ack type %d from LPAR %d.\n",
|
|
event->base_event.xSubtype, rlp);
|
|
};
|
|
}
|
|
|
|
static void veth_handle_int(struct veth_lpevent *event)
|
|
{
|
|
HvLpIndex rlp = event->base_event.xSourceLp;
|
|
struct veth_lpar_connection *cnx = veth_cnx[rlp];
|
|
unsigned long flags;
|
|
int i, acked = 0;
|
|
|
|
BUG_ON(! cnx);
|
|
|
|
switch (event->base_event.xSubtype) {
|
|
case VETH_EVENT_CAP:
|
|
veth_take_cap(cnx, event);
|
|
break;
|
|
case VETH_EVENT_MONITOR:
|
|
/* do nothing... this'll hang out here til we're dead,
|
|
* and the hypervisor will return it for us. */
|
|
break;
|
|
case VETH_EVENT_FRAMES_ACK:
|
|
spin_lock_irqsave(&cnx->lock, flags);
|
|
|
|
for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) {
|
|
u16 msgnum = event->u.frames_ack_data.token[i];
|
|
|
|
if (msgnum < VETH_NUMBUFFERS) {
|
|
veth_recycle_msg(cnx, cnx->msgs + msgnum);
|
|
cnx->outstanding_tx--;
|
|
acked++;
|
|
}
|
|
}
|
|
|
|
if (acked > 0) {
|
|
cnx->last_contact = jiffies;
|
|
veth_wake_queues(cnx);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&cnx->lock, flags);
|
|
break;
|
|
case VETH_EVENT_FRAMES:
|
|
veth_receive(cnx, event);
|
|
break;
|
|
default:
|
|
veth_error("Unknown interrupt type %d from LPAR %d.\n",
|
|
event->base_event.xSubtype, rlp);
|
|
};
|
|
}
|
|
|
|
static void veth_handle_event(struct HvLpEvent *event)
|
|
{
|
|
struct veth_lpevent *veth_event = (struct veth_lpevent *)event;
|
|
|
|
if (hvlpevent_is_ack(event))
|
|
veth_handle_ack(veth_event);
|
|
else
|
|
veth_handle_int(veth_event);
|
|
}
|
|
|
|
static int veth_process_caps(struct veth_lpar_connection *cnx)
|
|
{
|
|
struct veth_cap_data *remote_caps = &cnx->remote_caps;
|
|
int num_acks_needed;
|
|
|
|
/* Convert timer to jiffies */
|
|
cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000;
|
|
|
|
if ( (remote_caps->num_buffers == 0)
|
|
|| (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG)
|
|
|| (remote_caps->ack_threshold == 0)
|
|
|| (cnx->ack_timeout == 0) ) {
|
|
veth_error("Received incompatible capabilities from LPAR %d.\n",
|
|
cnx->remote_lp);
|
|
return HvLpEvent_Rc_InvalidSubtypeData;
|
|
}
|
|
|
|
num_acks_needed = (remote_caps->num_buffers
|
|
/ remote_caps->ack_threshold) + 1;
|
|
|
|
/* FIXME: locking on num_ack_events? */
|
|
if (cnx->num_ack_events < num_acks_needed) {
|
|
int num;
|
|
|
|
num = veth_allocate_events(cnx->remote_lp,
|
|
num_acks_needed-cnx->num_ack_events);
|
|
if (num > 0)
|
|
cnx->num_ack_events += num;
|
|
|
|
if (cnx->num_ack_events < num_acks_needed) {
|
|
veth_error("Couldn't allocate enough ack events "
|
|
"for LPAR %d.\n", cnx->remote_lp);
|
|
|
|
return HvLpEvent_Rc_BufferNotAvailable;
|
|
}
|
|
}
|
|
|
|
|
|
return HvLpEvent_Rc_Good;
|
|
}
|
|
|
|
/* FIXME: The gotos here are a bit dubious */
|
|
static void veth_statemachine(struct work_struct *work)
|
|
{
|
|
struct veth_lpar_connection *cnx =
|
|
container_of(work, struct veth_lpar_connection,
|
|
statemachine_wq.work);
|
|
int rlp = cnx->remote_lp;
|
|
int rc;
|
|
|
|
spin_lock_irq(&cnx->lock);
|
|
|
|
restart:
|
|
if (cnx->state & VETH_STATE_RESET) {
|
|
if (cnx->state & VETH_STATE_OPEN)
|
|
HvCallEvent_closeLpEventPath(cnx->remote_lp,
|
|
HvLpEvent_Type_VirtualLan);
|
|
|
|
/*
|
|
* Reset ack data. This prevents the ack_timer actually
|
|
* doing anything, even if it runs one more time when
|
|
* we drop the lock below.
|
|
*/
|
|
memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
|
|
cnx->num_pending_acks = 0;
|
|
|
|
cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
|
|
| VETH_STATE_OPEN | VETH_STATE_SENTCAPS
|
|
| VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
|
|
| VETH_STATE_SENTCAPACK | VETH_STATE_READY);
|
|
|
|
/* Clean up any leftover messages */
|
|
if (cnx->msgs) {
|
|
int i;
|
|
for (i = 0; i < VETH_NUMBUFFERS; ++i)
|
|
veth_recycle_msg(cnx, cnx->msgs + i);
|
|
}
|
|
|
|
cnx->outstanding_tx = 0;
|
|
veth_wake_queues(cnx);
|
|
|
|
/* Drop the lock so we can do stuff that might sleep or
|
|
* take other locks. */
|
|
spin_unlock_irq(&cnx->lock);
|
|
|
|
del_timer_sync(&cnx->ack_timer);
|
|
del_timer_sync(&cnx->reset_timer);
|
|
|
|
spin_lock_irq(&cnx->lock);
|
|
|
|
if (cnx->state & VETH_STATE_RESET)
|
|
goto restart;
|
|
|
|
/* Hack, wait for the other end to reset itself. */
|
|
if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
|
|
schedule_delayed_work(&cnx->statemachine_wq, 5 * HZ);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (cnx->state & VETH_STATE_SHUTDOWN)
|
|
/* It's all over, do nothing */
|
|
goto out;
|
|
|
|
if ( !(cnx->state & VETH_STATE_OPEN) ) {
|
|
if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
|
|
goto cant_cope;
|
|
|
|
HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
|
|
cnx->src_inst =
|
|
HvCallEvent_getSourceLpInstanceId(rlp,
|
|
HvLpEvent_Type_VirtualLan);
|
|
cnx->dst_inst =
|
|
HvCallEvent_getTargetLpInstanceId(rlp,
|
|
HvLpEvent_Type_VirtualLan);
|
|
cnx->state |= VETH_STATE_OPEN;
|
|
}
|
|
|
|
if ( (cnx->state & VETH_STATE_OPEN)
|
|
&& !(cnx->state & VETH_STATE_SENTMON) ) {
|
|
rc = veth_signalevent(cnx, VETH_EVENT_MONITOR,
|
|
HvLpEvent_AckInd_DoAck,
|
|
HvLpEvent_AckType_DeferredAck,
|
|
0, 0, 0, 0, 0, 0);
|
|
|
|
if (rc == HvLpEvent_Rc_Good) {
|
|
cnx->state |= VETH_STATE_SENTMON;
|
|
} else {
|
|
if ( (rc != HvLpEvent_Rc_PartitionDead)
|
|
&& (rc != HvLpEvent_Rc_PathClosed) )
|
|
veth_error("Error sending monitor to LPAR %d, "
|
|
"rc = %d\n", rlp, rc);
|
|
|
|
/* Oh well, hope we get a cap from the other
|
|
* end and do better when that kicks us */
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if ( (cnx->state & VETH_STATE_OPEN)
|
|
&& !(cnx->state & VETH_STATE_SENTCAPS)) {
|
|
u64 *rawcap = (u64 *)&cnx->local_caps;
|
|
|
|
rc = veth_signalevent(cnx, VETH_EVENT_CAP,
|
|
HvLpEvent_AckInd_DoAck,
|
|
HvLpEvent_AckType_ImmediateAck,
|
|
0, rawcap[0], rawcap[1], rawcap[2],
|
|
rawcap[3], rawcap[4]);
|
|
|
|
if (rc == HvLpEvent_Rc_Good) {
|
|
cnx->state |= VETH_STATE_SENTCAPS;
|
|
} else {
|
|
if ( (rc != HvLpEvent_Rc_PartitionDead)
|
|
&& (rc != HvLpEvent_Rc_PathClosed) )
|
|
veth_error("Error sending caps to LPAR %d, "
|
|
"rc = %d\n", rlp, rc);
|
|
|
|
/* Oh well, hope we get a cap from the other
|
|
* end and do better when that kicks us */
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if ((cnx->state & VETH_STATE_GOTCAPS)
|
|
&& !(cnx->state & VETH_STATE_SENTCAPACK)) {
|
|
struct veth_cap_data *remote_caps = &cnx->remote_caps;
|
|
|
|
memcpy(remote_caps, &cnx->cap_event.u.caps_data,
|
|
sizeof(*remote_caps));
|
|
|
|
spin_unlock_irq(&cnx->lock);
|
|
rc = veth_process_caps(cnx);
|
|
spin_lock_irq(&cnx->lock);
|
|
|
|
/* We dropped the lock, so recheck for anything which
|
|
* might mess us up */
|
|
if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
|
|
goto restart;
|
|
|
|
cnx->cap_event.base_event.xRc = rc;
|
|
HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
|
|
if (rc == HvLpEvent_Rc_Good)
|
|
cnx->state |= VETH_STATE_SENTCAPACK;
|
|
else
|
|
goto cant_cope;
|
|
}
|
|
|
|
if ((cnx->state & VETH_STATE_GOTCAPACK)
|
|
&& (cnx->state & VETH_STATE_GOTCAPS)
|
|
&& !(cnx->state & VETH_STATE_READY)) {
|
|
if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
|
|
/* Start the ACK timer */
|
|
cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
|
|
add_timer(&cnx->ack_timer);
|
|
cnx->state |= VETH_STATE_READY;
|
|
} else {
|
|
veth_error("Caps rejected by LPAR %d, rc = %d\n",
|
|
rlp, cnx->cap_ack_event.base_event.xRc);
|
|
goto cant_cope;
|
|
}
|
|
}
|
|
|
|
out:
|
|
spin_unlock_irq(&cnx->lock);
|
|
return;
|
|
|
|
cant_cope:
|
|
/* FIXME: we get here if something happens we really can't
|
|
* cope with. The link will never work once we get here, and
|
|
* all we can do is not lock the rest of the system up */
|
|
veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
|
|
" (state = 0x%04lx)\n", rlp, cnx->state);
|
|
cnx->state |= VETH_STATE_SHUTDOWN;
|
|
spin_unlock_irq(&cnx->lock);
|
|
}
|
|
|
|
static int veth_init_connection(u8 rlp)
|
|
{
|
|
struct veth_lpar_connection *cnx;
|
|
struct veth_msg *msgs;
|
|
int i, rc;
|
|
|
|
if ( (rlp == this_lp)
|
|
|| ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
|
|
return 0;
|
|
|
|
cnx = kmalloc(sizeof(*cnx), GFP_KERNEL);
|
|
if (! cnx)
|
|
return -ENOMEM;
|
|
memset(cnx, 0, sizeof(*cnx));
|
|
|
|
cnx->remote_lp = rlp;
|
|
spin_lock_init(&cnx->lock);
|
|
INIT_DELAYED_WORK(&cnx->statemachine_wq, veth_statemachine);
|
|
|
|
init_timer(&cnx->ack_timer);
|
|
cnx->ack_timer.function = veth_timed_ack;
|
|
cnx->ack_timer.data = (unsigned long) cnx;
|
|
|
|
init_timer(&cnx->reset_timer);
|
|
cnx->reset_timer.function = veth_timed_reset;
|
|
cnx->reset_timer.data = (unsigned long) cnx;
|
|
cnx->reset_timeout = 5 * HZ * (VETH_ACKTIMEOUT / 1000000);
|
|
|
|
memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
|
|
|
|
veth_cnx[rlp] = cnx;
|
|
|
|
/* This gets us 1 reference, which is held on behalf of the driver
|
|
* infrastructure. It's released at module unload. */
|
|
kobject_init(&cnx->kobject);
|
|
cnx->kobject.ktype = &veth_lpar_connection_ktype;
|
|
rc = kobject_set_name(&cnx->kobject, "cnx%.2d", rlp);
|
|
if (rc != 0)
|
|
return rc;
|
|
|
|
msgs = kmalloc(VETH_NUMBUFFERS * sizeof(struct veth_msg), GFP_KERNEL);
|
|
if (! msgs) {
|
|
veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
cnx->msgs = msgs;
|
|
memset(msgs, 0, VETH_NUMBUFFERS * sizeof(struct veth_msg));
|
|
|
|
for (i = 0; i < VETH_NUMBUFFERS; i++) {
|
|
msgs[i].token = i;
|
|
veth_stack_push(cnx, msgs + i);
|
|
}
|
|
|
|
cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
|
|
|
|
if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
|
|
veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
|
|
cnx->local_caps.ack_threshold = ACK_THRESHOLD;
|
|
cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void veth_stop_connection(struct veth_lpar_connection *cnx)
|
|
{
|
|
if (!cnx)
|
|
return;
|
|
|
|
spin_lock_irq(&cnx->lock);
|
|
cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
|
|
veth_kick_statemachine(cnx);
|
|
spin_unlock_irq(&cnx->lock);
|
|
|
|
/* There's a slim chance the reset code has just queued the
|
|
* statemachine to run in five seconds. If so we need to cancel
|
|
* that and requeue the work to run now. */
|
|
if (cancel_delayed_work(&cnx->statemachine_wq)) {
|
|
spin_lock_irq(&cnx->lock);
|
|
veth_kick_statemachine(cnx);
|
|
spin_unlock_irq(&cnx->lock);
|
|
}
|
|
|
|
/* Wait for the state machine to run. */
|
|
flush_scheduled_work();
|
|
}
|
|
|
|
static void veth_destroy_connection(struct veth_lpar_connection *cnx)
|
|
{
|
|
if (!cnx)
|
|
return;
|
|
|
|
if (cnx->num_events > 0)
|
|
mf_deallocate_lp_events(cnx->remote_lp,
|
|
HvLpEvent_Type_VirtualLan,
|
|
cnx->num_events,
|
|
NULL, NULL);
|
|
if (cnx->num_ack_events > 0)
|
|
mf_deallocate_lp_events(cnx->remote_lp,
|
|
HvLpEvent_Type_VirtualLan,
|
|
cnx->num_ack_events,
|
|
NULL, NULL);
|
|
|
|
kfree(cnx->msgs);
|
|
veth_cnx[cnx->remote_lp] = NULL;
|
|
kfree(cnx);
|
|
}
|
|
|
|
static void veth_release_connection(struct kobject *kobj)
|
|
{
|
|
struct veth_lpar_connection *cnx;
|
|
cnx = container_of(kobj, struct veth_lpar_connection, kobject);
|
|
veth_stop_connection(cnx);
|
|
veth_destroy_connection(cnx);
|
|
}
|
|
|
|
/*
|
|
* net_device code
|
|
*/
|
|
|
|
static int veth_open(struct net_device *dev)
|
|
{
|
|
struct veth_port *port = (struct veth_port *) dev->priv;
|
|
|
|
memset(&port->stats, 0, sizeof (port->stats));
|
|
netif_start_queue(dev);
|
|
return 0;
|
|
}
|
|
|
|
static int veth_close(struct net_device *dev)
|
|
{
|
|
netif_stop_queue(dev);
|
|
return 0;
|
|
}
|
|
|
|
static struct net_device_stats *veth_get_stats(struct net_device *dev)
|
|
{
|
|
struct veth_port *port = (struct veth_port *) dev->priv;
|
|
|
|
return &port->stats;
|
|
}
|
|
|
|
static int veth_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
|
|
return -EINVAL;
|
|
dev->mtu = new_mtu;
|
|
return 0;
|
|
}
|
|
|
|
static void veth_set_multicast_list(struct net_device *dev)
|
|
{
|
|
struct veth_port *port = (struct veth_port *) dev->priv;
|
|
unsigned long flags;
|
|
|
|
write_lock_irqsave(&port->mcast_gate, flags);
|
|
|
|
if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
|
|
(dev->mc_count > VETH_MAX_MCAST)) {
|
|
port->promiscuous = 1;
|
|
} else {
|
|
struct dev_mc_list *dmi = dev->mc_list;
|
|
int i;
|
|
|
|
port->promiscuous = 0;
|
|
|
|
/* Update table */
|
|
port->num_mcast = 0;
|
|
|
|
for (i = 0; i < dev->mc_count; i++) {
|
|
u8 *addr = dmi->dmi_addr;
|
|
u64 xaddr = 0;
|
|
|
|
if (addr[0] & 0x01) {/* multicast address? */
|
|
memcpy(&xaddr, addr, ETH_ALEN);
|
|
port->mcast_addr[port->num_mcast] = xaddr;
|
|
port->num_mcast++;
|
|
}
|
|
dmi = dmi->next;
|
|
}
|
|
}
|
|
|
|
write_unlock_irqrestore(&port->mcast_gate, flags);
|
|
}
|
|
|
|
static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
|
|
{
|
|
strncpy(info->driver, DRV_NAME, sizeof(info->driver) - 1);
|
|
info->driver[sizeof(info->driver) - 1] = '\0';
|
|
strncpy(info->version, DRV_VERSION, sizeof(info->version) - 1);
|
|
info->version[sizeof(info->version) - 1] = '\0';
|
|
}
|
|
|
|
static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
|
|
{
|
|
ecmd->supported = (SUPPORTED_1000baseT_Full
|
|
| SUPPORTED_Autoneg | SUPPORTED_FIBRE);
|
|
ecmd->advertising = (SUPPORTED_1000baseT_Full
|
|
| SUPPORTED_Autoneg | SUPPORTED_FIBRE);
|
|
ecmd->port = PORT_FIBRE;
|
|
ecmd->transceiver = XCVR_INTERNAL;
|
|
ecmd->phy_address = 0;
|
|
ecmd->speed = SPEED_1000;
|
|
ecmd->duplex = DUPLEX_FULL;
|
|
ecmd->autoneg = AUTONEG_ENABLE;
|
|
ecmd->maxtxpkt = 120;
|
|
ecmd->maxrxpkt = 120;
|
|
return 0;
|
|
}
|
|
|
|
static u32 veth_get_link(struct net_device *dev)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static const struct ethtool_ops ops = {
|
|
.get_drvinfo = veth_get_drvinfo,
|
|
.get_settings = veth_get_settings,
|
|
.get_link = veth_get_link,
|
|
};
|
|
|
|
static struct net_device * __init veth_probe_one(int vlan,
|
|
struct vio_dev *vio_dev)
|
|
{
|
|
struct net_device *dev;
|
|
struct veth_port *port;
|
|
struct device *vdev = &vio_dev->dev;
|
|
int i, rc;
|
|
const unsigned char *mac_addr;
|
|
|
|
mac_addr = vio_get_attribute(vio_dev, "local-mac-address", NULL);
|
|
if (mac_addr == NULL)
|
|
mac_addr = vio_get_attribute(vio_dev, "mac-address", NULL);
|
|
if (mac_addr == NULL) {
|
|
veth_error("Unable to fetch MAC address from device tree.\n");
|
|
return NULL;
|
|
}
|
|
|
|
dev = alloc_etherdev(sizeof (struct veth_port));
|
|
if (! dev) {
|
|
veth_error("Unable to allocate net_device structure!\n");
|
|
return NULL;
|
|
}
|
|
|
|
port = (struct veth_port *) dev->priv;
|
|
|
|
spin_lock_init(&port->queue_lock);
|
|
rwlock_init(&port->mcast_gate);
|
|
port->stopped_map = 0;
|
|
|
|
for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
|
|
HvLpVirtualLanIndexMap map;
|
|
|
|
if (i == this_lp)
|
|
continue;
|
|
map = HvLpConfig_getVirtualLanIndexMapForLp(i);
|
|
if (map & (0x8000 >> vlan))
|
|
port->lpar_map |= (1 << i);
|
|
}
|
|
port->dev = vdev;
|
|
|
|
memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
|
|
|
|
dev->mtu = VETH_MAX_MTU;
|
|
|
|
memcpy(&port->mac_addr, mac_addr, ETH_ALEN);
|
|
|
|
dev->open = veth_open;
|
|
dev->hard_start_xmit = veth_start_xmit;
|
|
dev->stop = veth_close;
|
|
dev->get_stats = veth_get_stats;
|
|
dev->change_mtu = veth_change_mtu;
|
|
dev->set_mac_address = NULL;
|
|
dev->set_multicast_list = veth_set_multicast_list;
|
|
SET_ETHTOOL_OPS(dev, &ops);
|
|
|
|
SET_NETDEV_DEV(dev, vdev);
|
|
|
|
rc = register_netdev(dev);
|
|
if (rc != 0) {
|
|
veth_error("Failed registering net device for vlan%d.\n", vlan);
|
|
free_netdev(dev);
|
|
return NULL;
|
|
}
|
|
|
|
kobject_init(&port->kobject);
|
|
port->kobject.parent = &dev->dev.kobj;
|
|
port->kobject.ktype = &veth_port_ktype;
|
|
kobject_set_name(&port->kobject, "veth_port");
|
|
if (0 != kobject_add(&port->kobject))
|
|
veth_error("Failed adding port for %s to sysfs.\n", dev->name);
|
|
|
|
veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
|
|
dev->name, vlan, port->lpar_map);
|
|
|
|
return dev;
|
|
}
|
|
|
|
/*
|
|
* Tx path
|
|
*/
|
|
|
|
static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
|
|
struct net_device *dev)
|
|
{
|
|
struct veth_lpar_connection *cnx = veth_cnx[rlp];
|
|
struct veth_port *port = (struct veth_port *) dev->priv;
|
|
HvLpEvent_Rc rc;
|
|
struct veth_msg *msg = NULL;
|
|
unsigned long flags;
|
|
|
|
if (! cnx)
|
|
return 0;
|
|
|
|
spin_lock_irqsave(&cnx->lock, flags);
|
|
|
|
if (! (cnx->state & VETH_STATE_READY))
|
|
goto no_error;
|
|
|
|
if ((skb->len - ETH_HLEN) > VETH_MAX_MTU)
|
|
goto drop;
|
|
|
|
msg = veth_stack_pop(cnx);
|
|
if (! msg)
|
|
goto drop;
|
|
|
|
msg->in_use = 1;
|
|
msg->skb = skb_get(skb);
|
|
|
|
msg->data.addr[0] = dma_map_single(port->dev, skb->data,
|
|
skb->len, DMA_TO_DEVICE);
|
|
|
|
if (dma_mapping_error(msg->data.addr[0]))
|
|
goto recycle_and_drop;
|
|
|
|
msg->dev = port->dev;
|
|
msg->data.len[0] = skb->len;
|
|
msg->data.eofmask = 1 << VETH_EOF_SHIFT;
|
|
|
|
rc = veth_signaldata(cnx, VETH_EVENT_FRAMES, msg->token, &msg->data);
|
|
|
|
if (rc != HvLpEvent_Rc_Good)
|
|
goto recycle_and_drop;
|
|
|
|
/* If the timer's not already running, start it now. */
|
|
if (0 == cnx->outstanding_tx)
|
|
mod_timer(&cnx->reset_timer, jiffies + cnx->reset_timeout);
|
|
|
|
cnx->last_contact = jiffies;
|
|
cnx->outstanding_tx++;
|
|
|
|
if (veth_stack_is_empty(cnx))
|
|
veth_stop_queues(cnx);
|
|
|
|
no_error:
|
|
spin_unlock_irqrestore(&cnx->lock, flags);
|
|
return 0;
|
|
|
|
recycle_and_drop:
|
|
veth_recycle_msg(cnx, msg);
|
|
drop:
|
|
spin_unlock_irqrestore(&cnx->lock, flags);
|
|
return 1;
|
|
}
|
|
|
|
static void veth_transmit_to_many(struct sk_buff *skb,
|
|
HvLpIndexMap lpmask,
|
|
struct net_device *dev)
|
|
{
|
|
struct veth_port *port = (struct veth_port *) dev->priv;
|
|
int i, success, error;
|
|
|
|
success = error = 0;
|
|
|
|
for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
|
|
if ((lpmask & (1 << i)) == 0)
|
|
continue;
|
|
|
|
if (veth_transmit_to_one(skb, i, dev))
|
|
error = 1;
|
|
else
|
|
success = 1;
|
|
}
|
|
|
|
if (error)
|
|
port->stats.tx_errors++;
|
|
|
|
if (success) {
|
|
port->stats.tx_packets++;
|
|
port->stats.tx_bytes += skb->len;
|
|
}
|
|
}
|
|
|
|
static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
unsigned char *frame = skb->data;
|
|
struct veth_port *port = (struct veth_port *) dev->priv;
|
|
HvLpIndexMap lpmask;
|
|
|
|
if (! (frame[0] & 0x01)) {
|
|
/* unicast packet */
|
|
HvLpIndex rlp = frame[5];
|
|
|
|
if ( ! ((1 << rlp) & port->lpar_map) ) {
|
|
dev_kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
lpmask = 1 << rlp;
|
|
} else {
|
|
lpmask = port->lpar_map;
|
|
}
|
|
|
|
veth_transmit_to_many(skb, lpmask, dev);
|
|
|
|
dev_kfree_skb(skb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* You must hold the connection's lock when you call this function. */
|
|
static void veth_recycle_msg(struct veth_lpar_connection *cnx,
|
|
struct veth_msg *msg)
|
|
{
|
|
u32 dma_address, dma_length;
|
|
|
|
if (msg->in_use) {
|
|
msg->in_use = 0;
|
|
dma_address = msg->data.addr[0];
|
|
dma_length = msg->data.len[0];
|
|
|
|
if (!dma_mapping_error(dma_address))
|
|
dma_unmap_single(msg->dev, dma_address, dma_length,
|
|
DMA_TO_DEVICE);
|
|
|
|
if (msg->skb) {
|
|
dev_kfree_skb_any(msg->skb);
|
|
msg->skb = NULL;
|
|
}
|
|
|
|
memset(&msg->data, 0, sizeof(msg->data));
|
|
veth_stack_push(cnx, msg);
|
|
} else if (cnx->state & VETH_STATE_OPEN) {
|
|
veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
|
|
cnx->remote_lp, msg->token);
|
|
}
|
|
}
|
|
|
|
static void veth_wake_queues(struct veth_lpar_connection *cnx)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
|
|
struct net_device *dev = veth_dev[i];
|
|
struct veth_port *port;
|
|
unsigned long flags;
|
|
|
|
if (! dev)
|
|
continue;
|
|
|
|
port = (struct veth_port *)dev->priv;
|
|
|
|
if (! (port->lpar_map & (1<<cnx->remote_lp)))
|
|
continue;
|
|
|
|
spin_lock_irqsave(&port->queue_lock, flags);
|
|
|
|
port->stopped_map &= ~(1 << cnx->remote_lp);
|
|
|
|
if (0 == port->stopped_map && netif_queue_stopped(dev)) {
|
|
veth_debug("cnx %d: woke queue for %s.\n",
|
|
cnx->remote_lp, dev->name);
|
|
netif_wake_queue(dev);
|
|
}
|
|
spin_unlock_irqrestore(&port->queue_lock, flags);
|
|
}
|
|
}
|
|
|
|
static void veth_stop_queues(struct veth_lpar_connection *cnx)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
|
|
struct net_device *dev = veth_dev[i];
|
|
struct veth_port *port;
|
|
|
|
if (! dev)
|
|
continue;
|
|
|
|
port = (struct veth_port *)dev->priv;
|
|
|
|
/* If this cnx is not on the vlan for this port, continue */
|
|
if (! (port->lpar_map & (1 << cnx->remote_lp)))
|
|
continue;
|
|
|
|
spin_lock(&port->queue_lock);
|
|
|
|
netif_stop_queue(dev);
|
|
port->stopped_map |= (1 << cnx->remote_lp);
|
|
|
|
veth_debug("cnx %d: stopped queue for %s, map = 0x%x.\n",
|
|
cnx->remote_lp, dev->name, port->stopped_map);
|
|
|
|
spin_unlock(&port->queue_lock);
|
|
}
|
|
}
|
|
|
|
static void veth_timed_reset(unsigned long ptr)
|
|
{
|
|
struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)ptr;
|
|
unsigned long trigger_time, flags;
|
|
|
|
/* FIXME is it possible this fires after veth_stop_connection()?
|
|
* That would reschedule the statemachine for 5 seconds and probably
|
|
* execute it after the module's been unloaded. Hmm. */
|
|
|
|
spin_lock_irqsave(&cnx->lock, flags);
|
|
|
|
if (cnx->outstanding_tx > 0) {
|
|
trigger_time = cnx->last_contact + cnx->reset_timeout;
|
|
|
|
if (trigger_time < jiffies) {
|
|
cnx->state |= VETH_STATE_RESET;
|
|
veth_kick_statemachine(cnx);
|
|
veth_error("%d packets not acked by LPAR %d within %d "
|
|
"seconds, resetting.\n",
|
|
cnx->outstanding_tx, cnx->remote_lp,
|
|
cnx->reset_timeout / HZ);
|
|
} else {
|
|
/* Reschedule the timer */
|
|
trigger_time = jiffies + cnx->reset_timeout;
|
|
mod_timer(&cnx->reset_timer, trigger_time);
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&cnx->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Rx path
|
|
*/
|
|
|
|
static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
|
|
{
|
|
int wanted = 0;
|
|
int i;
|
|
unsigned long flags;
|
|
|
|
if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
|
|
return 1;
|
|
|
|
read_lock_irqsave(&port->mcast_gate, flags);
|
|
|
|
if (port->promiscuous) {
|
|
wanted = 1;
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < port->num_mcast; ++i) {
|
|
if (port->mcast_addr[i] == mac_addr) {
|
|
wanted = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
read_unlock_irqrestore(&port->mcast_gate, flags);
|
|
|
|
return wanted;
|
|
}
|
|
|
|
struct dma_chunk {
|
|
u64 addr;
|
|
u64 size;
|
|
};
|
|
|
|
#define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
|
|
|
|
static inline void veth_build_dma_list(struct dma_chunk *list,
|
|
unsigned char *p, unsigned long length)
|
|
{
|
|
unsigned long done;
|
|
int i = 1;
|
|
|
|
/* FIXME: skbs are continguous in real addresses. Do we
|
|
* really need to break it into PAGE_SIZE chunks, or can we do
|
|
* it just at the granularity of iSeries real->absolute
|
|
* mapping? Indeed, given the way the allocator works, can we
|
|
* count on them being absolutely contiguous? */
|
|
list[0].addr = iseries_hv_addr(p);
|
|
list[0].size = min(length,
|
|
PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
|
|
|
|
done = list[0].size;
|
|
while (done < length) {
|
|
list[i].addr = iseries_hv_addr(p + done);
|
|
list[i].size = min(length-done, PAGE_SIZE);
|
|
done += list[i].size;
|
|
i++;
|
|
}
|
|
}
|
|
|
|
static void veth_flush_acks(struct veth_lpar_connection *cnx)
|
|
{
|
|
HvLpEvent_Rc rc;
|
|
|
|
rc = veth_signaldata(cnx, VETH_EVENT_FRAMES_ACK,
|
|
0, &cnx->pending_acks);
|
|
|
|
if (rc != HvLpEvent_Rc_Good)
|
|
veth_error("Failed acking frames from LPAR %d, rc = %d\n",
|
|
cnx->remote_lp, (int)rc);
|
|
|
|
cnx->num_pending_acks = 0;
|
|
memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
|
|
}
|
|
|
|
static void veth_receive(struct veth_lpar_connection *cnx,
|
|
struct veth_lpevent *event)
|
|
{
|
|
struct veth_frames_data *senddata = &event->u.frames_data;
|
|
int startchunk = 0;
|
|
int nchunks;
|
|
unsigned long flags;
|
|
HvLpDma_Rc rc;
|
|
|
|
do {
|
|
u16 length = 0;
|
|
struct sk_buff *skb;
|
|
struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
|
|
struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
|
|
u64 dest;
|
|
HvLpVirtualLanIndex vlan;
|
|
struct net_device *dev;
|
|
struct veth_port *port;
|
|
|
|
/* FIXME: do we need this? */
|
|
memset(local_list, 0, sizeof(local_list));
|
|
memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
|
|
|
|
/* a 0 address marks the end of the valid entries */
|
|
if (senddata->addr[startchunk] == 0)
|
|
break;
|
|
|
|
/* make sure that we have at least 1 EOF entry in the
|
|
* remaining entries */
|
|
if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
|
|
veth_error("Missing EOF fragment in event "
|
|
"eofmask = 0x%x startchunk = %d\n",
|
|
(unsigned)senddata->eofmask,
|
|
startchunk);
|
|
break;
|
|
}
|
|
|
|
/* build list of chunks in this frame */
|
|
nchunks = 0;
|
|
do {
|
|
remote_list[nchunks].addr =
|
|
(u64) senddata->addr[startchunk+nchunks] << 32;
|
|
remote_list[nchunks].size =
|
|
senddata->len[startchunk+nchunks];
|
|
length += remote_list[nchunks].size;
|
|
} while (! (senddata->eofmask &
|
|
(1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
|
|
|
|
/* length == total length of all chunks */
|
|
/* nchunks == # of chunks in this frame */
|
|
|
|
if ((length - ETH_HLEN) > VETH_MAX_MTU) {
|
|
veth_error("Received oversize frame from LPAR %d "
|
|
"(length = %d)\n",
|
|
cnx->remote_lp, length);
|
|
continue;
|
|
}
|
|
|
|
skb = alloc_skb(length, GFP_ATOMIC);
|
|
if (!skb)
|
|
continue;
|
|
|
|
veth_build_dma_list(local_list, skb->data, length);
|
|
|
|
rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
|
|
event->base_event.xSourceLp,
|
|
HvLpDma_Direction_RemoteToLocal,
|
|
cnx->src_inst,
|
|
cnx->dst_inst,
|
|
HvLpDma_AddressType_RealAddress,
|
|
HvLpDma_AddressType_TceIndex,
|
|
iseries_hv_addr(&local_list),
|
|
iseries_hv_addr(&remote_list),
|
|
length);
|
|
if (rc != HvLpDma_Rc_Good) {
|
|
dev_kfree_skb_irq(skb);
|
|
continue;
|
|
}
|
|
|
|
vlan = skb->data[9];
|
|
dev = veth_dev[vlan];
|
|
if (! dev) {
|
|
/*
|
|
* Some earlier versions of the driver sent
|
|
* broadcasts down all connections, even to lpars
|
|
* that weren't on the relevant vlan. So ignore
|
|
* packets belonging to a vlan we're not on.
|
|
* We can also be here if we receive packets while
|
|
* the driver is going down, because then dev is NULL.
|
|
*/
|
|
dev_kfree_skb_irq(skb);
|
|
continue;
|
|
}
|
|
|
|
port = (struct veth_port *)dev->priv;
|
|
dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
|
|
|
|
if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
|
|
dev_kfree_skb_irq(skb);
|
|
continue;
|
|
}
|
|
if (! veth_frame_wanted(port, dest)) {
|
|
dev_kfree_skb_irq(skb);
|
|
continue;
|
|
}
|
|
|
|
skb_put(skb, length);
|
|
skb->protocol = eth_type_trans(skb, dev);
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
netif_rx(skb); /* send it up */
|
|
port->stats.rx_packets++;
|
|
port->stats.rx_bytes += length;
|
|
} while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
|
|
|
|
/* Ack it */
|
|
spin_lock_irqsave(&cnx->lock, flags);
|
|
BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
|
|
|
|
cnx->pending_acks[cnx->num_pending_acks++] =
|
|
event->base_event.xCorrelationToken;
|
|
|
|
if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold)
|
|
|| (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
|
|
veth_flush_acks(cnx);
|
|
|
|
spin_unlock_irqrestore(&cnx->lock, flags);
|
|
}
|
|
|
|
static void veth_timed_ack(unsigned long ptr)
|
|
{
|
|
struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
|
|
unsigned long flags;
|
|
|
|
/* Ack all the events */
|
|
spin_lock_irqsave(&cnx->lock, flags);
|
|
if (cnx->num_pending_acks > 0)
|
|
veth_flush_acks(cnx);
|
|
|
|
/* Reschedule the timer */
|
|
cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
|
|
add_timer(&cnx->ack_timer);
|
|
spin_unlock_irqrestore(&cnx->lock, flags);
|
|
}
|
|
|
|
static int veth_remove(struct vio_dev *vdev)
|
|
{
|
|
struct veth_lpar_connection *cnx;
|
|
struct net_device *dev;
|
|
struct veth_port *port;
|
|
int i;
|
|
|
|
dev = veth_dev[vdev->unit_address];
|
|
|
|
if (! dev)
|
|
return 0;
|
|
|
|
port = netdev_priv(dev);
|
|
|
|
for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
|
|
cnx = veth_cnx[i];
|
|
|
|
if (cnx && (port->lpar_map & (1 << i))) {
|
|
/* Drop our reference to connections on our VLAN */
|
|
kobject_put(&cnx->kobject);
|
|
}
|
|
}
|
|
|
|
veth_dev[vdev->unit_address] = NULL;
|
|
kobject_del(&port->kobject);
|
|
kobject_put(&port->kobject);
|
|
unregister_netdev(dev);
|
|
free_netdev(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
|
|
{
|
|
int i = vdev->unit_address;
|
|
struct net_device *dev;
|
|
struct veth_port *port;
|
|
|
|
dev = veth_probe_one(i, vdev);
|
|
if (dev == NULL) {
|
|
veth_remove(vdev);
|
|
return 1;
|
|
}
|
|
veth_dev[i] = dev;
|
|
|
|
port = (struct veth_port*)netdev_priv(dev);
|
|
|
|
/* Start the state machine on each connection on this vlan. If we're
|
|
* the first dev to do so this will commence link negotiation */
|
|
for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
|
|
struct veth_lpar_connection *cnx;
|
|
|
|
if (! (port->lpar_map & (1 << i)))
|
|
continue;
|
|
|
|
cnx = veth_cnx[i];
|
|
if (!cnx)
|
|
continue;
|
|
|
|
kobject_get(&cnx->kobject);
|
|
veth_kick_statemachine(cnx);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* veth_device_table: Used by vio.c to match devices that we
|
|
* support.
|
|
*/
|
|
static struct vio_device_id veth_device_table[] __devinitdata = {
|
|
{ "network", "IBM,iSeries-l-lan" },
|
|
{ "", "" }
|
|
};
|
|
MODULE_DEVICE_TABLE(vio, veth_device_table);
|
|
|
|
static struct vio_driver veth_driver = {
|
|
.id_table = veth_device_table,
|
|
.probe = veth_probe,
|
|
.remove = veth_remove,
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
.owner = THIS_MODULE,
|
|
}
|
|
};
|
|
|
|
/*
|
|
* Module initialization/cleanup
|
|
*/
|
|
|
|
static void __exit veth_module_cleanup(void)
|
|
{
|
|
int i;
|
|
struct veth_lpar_connection *cnx;
|
|
|
|
/* Disconnect our "irq" to stop events coming from the Hypervisor. */
|
|
HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
|
|
|
|
/* Make sure any work queued from Hypervisor callbacks is finished. */
|
|
flush_scheduled_work();
|
|
|
|
for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
|
|
cnx = veth_cnx[i];
|
|
|
|
if (!cnx)
|
|
continue;
|
|
|
|
/* Remove the connection from sysfs */
|
|
kobject_del(&cnx->kobject);
|
|
/* Drop the driver's reference to the connection */
|
|
kobject_put(&cnx->kobject);
|
|
}
|
|
|
|
/* Unregister the driver, which will close all the netdevs and stop
|
|
* the connections when they're no longer referenced. */
|
|
vio_unregister_driver(&veth_driver);
|
|
}
|
|
module_exit(veth_module_cleanup);
|
|
|
|
static int __init veth_module_init(void)
|
|
{
|
|
int i;
|
|
int rc;
|
|
|
|
if (!firmware_has_feature(FW_FEATURE_ISERIES))
|
|
return -ENODEV;
|
|
|
|
this_lp = HvLpConfig_getLpIndex_outline();
|
|
|
|
for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
|
|
rc = veth_init_connection(i);
|
|
if (rc != 0)
|
|
goto error;
|
|
}
|
|
|
|
HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
|
|
&veth_handle_event);
|
|
|
|
rc = vio_register_driver(&veth_driver);
|
|
if (rc != 0)
|
|
goto error;
|
|
|
|
for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
|
|
struct kobject *kobj;
|
|
|
|
if (!veth_cnx[i])
|
|
continue;
|
|
|
|
kobj = &veth_cnx[i]->kobject;
|
|
kobj->parent = &veth_driver.driver.kobj;
|
|
/* If the add failes, complain but otherwise continue */
|
|
if (0 != kobject_add(kobj))
|
|
veth_error("cnx %d: Failed adding to sysfs.\n", i);
|
|
}
|
|
|
|
return 0;
|
|
|
|
error:
|
|
for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
|
|
veth_destroy_connection(veth_cnx[i]);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
module_init(veth_module_init);
|