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370c3bd05c
When rport_login is called on an rport that is already thought to be logged in, use ADISC. If that fails, redo PLOGI. This is less disruptive after fabric changes that don't affect the state of the target. Implement the sending of ADISC via fc_els_fill. Add ADISC state to the rport state machine. This is entered from READY and returns to READY after successful completion. If it fails, the rport is either logged off and deleted or re-does PLOGI. Signed-off-by: Joe Eykholt <jeykholt@cisco.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
1094 lines
28 KiB
C
1094 lines
28 KiB
C
/*
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* Copyright(c) 2007 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Maintained at www.Open-FCoE.org
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*/
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#ifndef _LIBFC_H_
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#define _LIBFC_H_
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#include <linux/timer.h>
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#include <linux/if.h>
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#include <linux/percpu.h>
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_transport_fc.h>
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#include <scsi/fc/fc_fcp.h>
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#include <scsi/fc/fc_ns.h>
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#include <scsi/fc/fc_els.h>
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#include <scsi/fc/fc_gs.h>
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#include <scsi/fc_frame.h>
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#define FC_LIBFC_LOGGING 0x01 /* General logging, not categorized */
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#define FC_LPORT_LOGGING 0x02 /* lport layer logging */
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#define FC_DISC_LOGGING 0x04 /* discovery layer logging */
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#define FC_RPORT_LOGGING 0x08 /* rport layer logging */
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#define FC_FCP_LOGGING 0x10 /* I/O path logging */
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#define FC_EM_LOGGING 0x20 /* Exchange Manager logging */
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#define FC_EXCH_LOGGING 0x40 /* Exchange/Sequence logging */
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#define FC_SCSI_LOGGING 0x80 /* SCSI logging (mostly error handling) */
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extern unsigned int fc_debug_logging;
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#define FC_CHECK_LOGGING(LEVEL, CMD) \
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do { \
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if (unlikely(fc_debug_logging & LEVEL)) \
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do { \
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CMD; \
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} while (0); \
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} while (0)
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#define FC_LIBFC_DBG(fmt, args...) \
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FC_CHECK_LOGGING(FC_LIBFC_LOGGING, \
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printk(KERN_INFO "libfc: " fmt, ##args))
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#define FC_LPORT_DBG(lport, fmt, args...) \
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FC_CHECK_LOGGING(FC_LPORT_LOGGING, \
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printk(KERN_INFO "host%u: lport %6x: " fmt, \
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(lport)->host->host_no, \
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fc_host_port_id((lport)->host), ##args))
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#define FC_DISC_DBG(disc, fmt, args...) \
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FC_CHECK_LOGGING(FC_DISC_LOGGING, \
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printk(KERN_INFO "host%u: disc: " fmt, \
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(disc)->lport->host->host_no, \
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##args))
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#define FC_RPORT_ID_DBG(lport, port_id, fmt, args...) \
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FC_CHECK_LOGGING(FC_RPORT_LOGGING, \
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printk(KERN_INFO "host%u: rport %6x: " fmt, \
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(lport)->host->host_no, \
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(port_id), ##args))
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#define FC_RPORT_DBG(rdata, fmt, args...) \
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FC_RPORT_ID_DBG((rdata)->local_port, (rdata)->ids.port_id, fmt, ##args)
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#define FC_FCP_DBG(pkt, fmt, args...) \
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FC_CHECK_LOGGING(FC_FCP_LOGGING, \
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printk(KERN_INFO "host%u: fcp: %6x: " fmt, \
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(pkt)->lp->host->host_no, \
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pkt->rport->port_id, ##args))
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#define FC_EXCH_DBG(exch, fmt, args...) \
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FC_CHECK_LOGGING(FC_EXCH_LOGGING, \
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printk(KERN_INFO "host%u: xid %4x: " fmt, \
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(exch)->lp->host->host_no, \
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exch->xid, ##args))
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#define FC_SCSI_DBG(lport, fmt, args...) \
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FC_CHECK_LOGGING(FC_SCSI_LOGGING, \
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printk(KERN_INFO "host%u: scsi: " fmt, \
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(lport)->host->host_no, ##args))
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/*
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* libfc error codes
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*/
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#define FC_NO_ERR 0 /* no error */
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#define FC_EX_TIMEOUT 1 /* Exchange timeout */
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#define FC_EX_CLOSED 2 /* Exchange closed */
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/* some helpful macros */
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#define ntohll(x) be64_to_cpu(x)
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#define htonll(x) cpu_to_be64(x)
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#define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
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#define hton24(p, v) do { \
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p[0] = (((v) >> 16) & 0xFF); \
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p[1] = (((v) >> 8) & 0xFF); \
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p[2] = ((v) & 0xFF); \
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} while (0)
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/*
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* FC HBA status
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*/
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enum fc_lport_state {
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LPORT_ST_DISABLED = 0,
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LPORT_ST_FLOGI,
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LPORT_ST_DNS,
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LPORT_ST_RPN_ID,
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LPORT_ST_RFT_ID,
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LPORT_ST_SCR,
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LPORT_ST_READY,
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LPORT_ST_LOGO,
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LPORT_ST_RESET
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};
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enum fc_disc_event {
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DISC_EV_NONE = 0,
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DISC_EV_SUCCESS,
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DISC_EV_FAILED
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};
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enum fc_rport_state {
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RPORT_ST_INIT, /* initialized */
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RPORT_ST_PLOGI, /* waiting for PLOGI completion */
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RPORT_ST_PRLI, /* waiting for PRLI completion */
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RPORT_ST_RTV, /* waiting for RTV completion */
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RPORT_ST_READY, /* ready for use */
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RPORT_ST_LOGO, /* port logout sent */
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RPORT_ST_ADISC, /* Discover Address sent */
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RPORT_ST_DELETE, /* port being deleted */
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};
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/**
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* struct fc_disc_port - temporary discovery port to hold rport identifiers
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* @lp: Fibre Channel host port instance
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* @peers: Node for list management during discovery and RSCN processing
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* @rport_work: Work struct for starting the rport state machine
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* @port_id: Port ID of the discovered port
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*/
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struct fc_disc_port {
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struct fc_lport *lp;
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struct list_head peers;
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struct work_struct rport_work;
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u32 port_id;
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};
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enum fc_rport_event {
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RPORT_EV_NONE = 0,
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RPORT_EV_READY,
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RPORT_EV_FAILED,
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RPORT_EV_STOP,
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RPORT_EV_LOGO
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};
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struct fc_rport_priv;
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struct fc_rport_operations {
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void (*event_callback)(struct fc_lport *, struct fc_rport_priv *,
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enum fc_rport_event);
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};
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/**
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* struct fc_rport_libfc_priv - libfc internal information about a remote port
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* @local_port: Fibre Channel host port instance
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* @rp_state: indicates READY for I/O or DELETE when blocked.
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* @flags: REC and RETRY supported flags
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* @e_d_tov: error detect timeout value (in msec)
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* @r_a_tov: resource allocation timeout value (in msec)
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*/
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struct fc_rport_libfc_priv {
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struct fc_lport *local_port;
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enum fc_rport_state rp_state;
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u16 flags;
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#define FC_RP_FLAGS_REC_SUPPORTED (1 << 0)
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#define FC_RP_FLAGS_RETRY (1 << 1)
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unsigned int e_d_tov;
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unsigned int r_a_tov;
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};
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/**
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* struct fc_rport_priv - libfc rport and discovery info about a remote port
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* @local_port: Fibre Channel host port instance
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* @rport: transport remote port
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* @kref: reference counter
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* @rp_state: state tracks progress of PLOGI, PRLI, and RTV exchanges
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* @ids: remote port identifiers and roles
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* @flags: REC and RETRY supported flags
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* @max_seq: maximum number of concurrent sequences
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* @disc_id: discovery identifier
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* @maxframe_size: maximum frame size
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* @retries: retry count in current state
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* @e_d_tov: error detect timeout value (in msec)
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* @r_a_tov: resource allocation timeout value (in msec)
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* @rp_mutex: mutex protects rport
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* @retry_work:
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* @event_callback: Callback for rport READY, FAILED or LOGO
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*/
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struct fc_rport_priv {
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struct fc_lport *local_port;
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struct fc_rport *rport;
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struct kref kref;
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enum fc_rport_state rp_state;
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struct fc_rport_identifiers ids;
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u16 flags;
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u16 max_seq;
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u16 disc_id;
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u16 maxframe_size;
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unsigned int retries;
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unsigned int e_d_tov;
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unsigned int r_a_tov;
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struct mutex rp_mutex;
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struct delayed_work retry_work;
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enum fc_rport_event event;
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struct fc_rport_operations *ops;
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struct list_head peers;
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struct work_struct event_work;
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u32 supported_classes;
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};
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/*
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* fcoe stats structure
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*/
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struct fcoe_dev_stats {
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u64 SecondsSinceLastReset;
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u64 TxFrames;
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u64 TxWords;
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u64 RxFrames;
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u64 RxWords;
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u64 ErrorFrames;
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u64 DumpedFrames;
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u64 LinkFailureCount;
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u64 LossOfSignalCount;
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u64 InvalidTxWordCount;
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u64 InvalidCRCCount;
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u64 InputRequests;
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u64 OutputRequests;
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u64 ControlRequests;
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u64 InputMegabytes;
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u64 OutputMegabytes;
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};
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/*
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* els data is used for passing ELS respone specific
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* data to send ELS response mainly using infomation
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* in exchange and sequence in EM layer.
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*/
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struct fc_seq_els_data {
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struct fc_frame *fp;
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enum fc_els_rjt_reason reason;
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enum fc_els_rjt_explan explan;
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};
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/*
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* FCP request structure, one for each scsi cmd request
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*/
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struct fc_fcp_pkt {
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/*
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* housekeeping stuff
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*/
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struct fc_lport *lp; /* handle to hba struct */
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u16 state; /* scsi_pkt state state */
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u16 tgt_flags; /* target flags */
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atomic_t ref_cnt; /* fcp pkt ref count */
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spinlock_t scsi_pkt_lock; /* Must be taken before the host lock
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* if both are held at the same time */
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/*
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* SCSI I/O related stuff
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*/
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struct scsi_cmnd *cmd; /* scsi command pointer. set/clear
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* under host lock */
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struct list_head list; /* tracks queued commands. access under
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* host lock */
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/*
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* timeout related stuff
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*/
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struct timer_list timer; /* command timer */
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struct completion tm_done;
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int wait_for_comp;
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unsigned long start_time; /* start jiffie */
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unsigned long end_time; /* end jiffie */
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unsigned long last_pkt_time; /* jiffies of last frame received */
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/*
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* scsi cmd and data transfer information
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*/
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u32 data_len;
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/*
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* transport related veriables
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*/
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struct fcp_cmnd cdb_cmd;
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size_t xfer_len;
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u16 xfer_ddp; /* this xfer is ddped */
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u32 xfer_contig_end; /* offset of end of contiguous xfer */
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u16 max_payload; /* max payload size in bytes */
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/*
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* scsi/fcp return status
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*/
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u32 io_status; /* SCSI result upper 24 bits */
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u8 cdb_status;
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u8 status_code; /* FCP I/O status */
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/* bit 3 Underrun bit 2: overrun */
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u8 scsi_comp_flags;
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u32 req_flags; /* bit 0: read bit:1 write */
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u32 scsi_resid; /* residule length */
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struct fc_rport *rport; /* remote port pointer */
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struct fc_seq *seq_ptr; /* current sequence pointer */
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/*
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* Error Processing
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*/
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u8 recov_retry; /* count of recovery retries */
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struct fc_seq *recov_seq; /* sequence for REC or SRR */
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};
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/*
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* FC_FCP HELPER FUNCTIONS
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*****************************/
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static inline bool fc_fcp_is_read(const struct fc_fcp_pkt *fsp)
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{
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if (fsp && fsp->cmd)
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return fsp->cmd->sc_data_direction == DMA_FROM_DEVICE;
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return false;
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}
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/*
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* Structure and function definitions for managing Fibre Channel Exchanges
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* and Sequences
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*
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* fc_exch holds state for one exchange and links to its active sequence.
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*
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* fc_seq holds the state for an individual sequence.
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*/
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struct fc_exch_mgr;
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struct fc_exch_mgr_anchor;
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extern u16 fc_cpu_mask; /* cpu mask for possible cpus */
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/*
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* Sequence.
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*/
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struct fc_seq {
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u8 id; /* seq ID */
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u16 ssb_stat; /* status flags for sequence status block */
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u16 cnt; /* frames sent so far on sequence */
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u32 rec_data; /* FC-4 value for REC */
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};
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#define FC_EX_DONE (1 << 0) /* ep is completed */
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#define FC_EX_RST_CLEANUP (1 << 1) /* reset is forcing completion */
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/*
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* Exchange.
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*
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* Locking notes: The ex_lock protects following items:
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* state, esb_stat, f_ctl, seq.ssb_stat
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* seq_id
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* sequence allocation
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*/
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struct fc_exch {
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struct fc_exch_mgr *em; /* exchange manager */
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struct fc_exch_pool *pool; /* per cpu exches pool */
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u32 state; /* internal driver state */
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u16 xid; /* our exchange ID */
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struct list_head ex_list; /* free or busy list linkage */
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spinlock_t ex_lock; /* lock covering exchange state */
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atomic_t ex_refcnt; /* reference counter */
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struct delayed_work timeout_work; /* timer for upper level protocols */
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struct fc_lport *lp; /* fc device instance */
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u16 oxid; /* originator's exchange ID */
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u16 rxid; /* responder's exchange ID */
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u32 oid; /* originator's FCID */
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u32 sid; /* source FCID */
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u32 did; /* destination FCID */
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u32 esb_stat; /* exchange status for ESB */
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u32 r_a_tov; /* r_a_tov from rport (msec) */
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u8 seq_id; /* next sequence ID to use */
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u32 f_ctl; /* F_CTL flags for sequences */
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u8 fh_type; /* frame type */
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enum fc_class class; /* class of service */
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struct fc_seq seq; /* single sequence */
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/*
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* Handler for responses to this current exchange.
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*/
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void (*resp)(struct fc_seq *, struct fc_frame *, void *);
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void (*destructor)(struct fc_seq *, void *);
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/*
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* arg is passed as void pointer to exchange
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* resp and destructor handlers
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*/
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void *arg;
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};
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#define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
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struct libfc_function_template {
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/*
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* Interface to send a FC frame
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*
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* STATUS: REQUIRED
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*/
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int (*frame_send)(struct fc_lport *lp, struct fc_frame *fp);
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/*
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* Interface to send ELS/CT frames
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*
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* STATUS: OPTIONAL
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*/
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struct fc_seq *(*elsct_send)(struct fc_lport *lport,
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u32 did,
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struct fc_frame *fp,
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unsigned int op,
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void (*resp)(struct fc_seq *,
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struct fc_frame *fp,
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void *arg),
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void *arg, u32 timer_msec);
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/*
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* Send the FC frame payload using a new exchange and sequence.
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*
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* The frame pointer with some of the header's fields must be
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* filled before calling exch_seq_send(), those fields are,
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*
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* - routing control
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* - FC port did
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* - FC port sid
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* - FC header type
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* - frame control
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* - parameter or relative offset
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*
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* The exchange response handler is set in this routine to resp()
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* function pointer. It can be called in two scenarios: if a timeout
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* occurs or if a response frame is received for the exchange. The
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* fc_frame pointer in response handler will also indicate timeout
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* as error using IS_ERR related macros.
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*
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* The exchange destructor handler is also set in this routine.
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* The destructor handler is invoked by EM layer when exchange
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* is about to free, this can be used by caller to free its
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* resources along with exchange free.
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*
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* The arg is passed back to resp and destructor handler.
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*
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* The timeout value (in msec) for an exchange is set if non zero
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* timer_msec argument is specified. The timer is canceled when
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* it fires or when the exchange is done. The exchange timeout handler
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* is registered by EM layer.
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*
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* STATUS: OPTIONAL
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*/
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struct fc_seq *(*exch_seq_send)(struct fc_lport *lp,
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struct fc_frame *fp,
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void (*resp)(struct fc_seq *sp,
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struct fc_frame *fp,
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void *arg),
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void (*destructor)(struct fc_seq *sp,
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void *arg),
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void *arg, unsigned int timer_msec);
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/*
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* Sets up the DDP context for a given exchange id on the given
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* scatterlist if LLD supports DDP for large receive.
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*
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* STATUS: OPTIONAL
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*/
|
|
int (*ddp_setup)(struct fc_lport *lp, u16 xid,
|
|
struct scatterlist *sgl, unsigned int sgc);
|
|
/*
|
|
* Completes the DDP transfer and returns the length of data DDPed
|
|
* for the given exchange id.
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
int (*ddp_done)(struct fc_lport *lp, u16 xid);
|
|
/*
|
|
* Send a frame using an existing sequence and exchange.
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
int (*seq_send)(struct fc_lport *lp, struct fc_seq *sp,
|
|
struct fc_frame *fp);
|
|
|
|
/*
|
|
* Send an ELS response using infomation from a previous
|
|
* exchange and sequence.
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
void (*seq_els_rsp_send)(struct fc_seq *sp, enum fc_els_cmd els_cmd,
|
|
struct fc_seq_els_data *els_data);
|
|
|
|
/*
|
|
* Abort an exchange and sequence. Generally called because of a
|
|
* exchange timeout or an abort from the upper layer.
|
|
*
|
|
* A timer_msec can be specified for abort timeout, if non-zero
|
|
* timer_msec value is specified then exchange resp handler
|
|
* will be called with timeout error if no response to abort.
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
int (*seq_exch_abort)(const struct fc_seq *req_sp,
|
|
unsigned int timer_msec);
|
|
|
|
/*
|
|
* Indicate that an exchange/sequence tuple is complete and the memory
|
|
* allocated for the related objects may be freed.
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
void (*exch_done)(struct fc_seq *sp);
|
|
|
|
/*
|
|
* Start a new sequence on the same exchange/sequence tuple.
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
struct fc_seq *(*seq_start_next)(struct fc_seq *sp);
|
|
|
|
/*
|
|
* Reset an exchange manager, completing all sequences and exchanges.
|
|
* If s_id is non-zero, reset only exchanges originating from that FID.
|
|
* If d_id is non-zero, reset only exchanges sending to that FID.
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
void (*exch_mgr_reset)(struct fc_lport *,
|
|
u32 s_id, u32 d_id);
|
|
|
|
/*
|
|
* Flush the rport work queue. Generally used before shutdown.
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
void (*rport_flush_queue)(void);
|
|
|
|
/*
|
|
* Receive a frame for a local port.
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
void (*lport_recv)(struct fc_lport *lp, struct fc_seq *sp,
|
|
struct fc_frame *fp);
|
|
|
|
/*
|
|
* Reset the local port.
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
int (*lport_reset)(struct fc_lport *);
|
|
|
|
/*
|
|
* Create a remote port with a given port ID
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
struct fc_rport_priv *(*rport_create)(struct fc_lport *, u32);
|
|
|
|
/*
|
|
* Initiates the RP state machine. It is called from the LP module.
|
|
* This function will issue the following commands to the N_Port
|
|
* identified by the FC ID provided.
|
|
*
|
|
* - PLOGI
|
|
* - PRLI
|
|
* - RTV
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
int (*rport_login)(struct fc_rport_priv *);
|
|
|
|
/*
|
|
* Logoff, and remove the rport from the transport if
|
|
* it had been added. This will send a LOGO to the target.
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
int (*rport_logoff)(struct fc_rport_priv *);
|
|
|
|
/*
|
|
* Recieve a request from a remote port.
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
void (*rport_recv_req)(struct fc_seq *, struct fc_frame *,
|
|
struct fc_lport *);
|
|
|
|
/*
|
|
* lookup an rport by it's port ID.
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
struct fc_rport_priv *(*rport_lookup)(const struct fc_lport *, u32);
|
|
|
|
/*
|
|
* Destroy an rport after final kref_put().
|
|
* The argument is a pointer to the kref inside the fc_rport_priv.
|
|
*/
|
|
void (*rport_destroy)(struct kref *);
|
|
|
|
/*
|
|
* Send a fcp cmd from fsp pkt.
|
|
* Called with the SCSI host lock unlocked and irqs disabled.
|
|
*
|
|
* The resp handler is called when FCP_RSP received.
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
int (*fcp_cmd_send)(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
|
|
void (*resp)(struct fc_seq *, struct fc_frame *fp,
|
|
void *arg));
|
|
|
|
/*
|
|
* Cleanup the FCP layer, used durring link down and reset
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
void (*fcp_cleanup)(struct fc_lport *lp);
|
|
|
|
/*
|
|
* Abort all I/O on a local port
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
void (*fcp_abort_io)(struct fc_lport *lp);
|
|
|
|
/*
|
|
* Receive a request for the discovery layer.
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
void (*disc_recv_req)(struct fc_seq *,
|
|
struct fc_frame *, struct fc_lport *);
|
|
|
|
/*
|
|
* Start discovery for a local port.
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
void (*disc_start)(void (*disc_callback)(struct fc_lport *,
|
|
enum fc_disc_event),
|
|
struct fc_lport *);
|
|
|
|
/*
|
|
* Stop discovery for a given lport. This will remove
|
|
* all discovered rports
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
void (*disc_stop) (struct fc_lport *);
|
|
|
|
/*
|
|
* Stop discovery for a given lport. This will block
|
|
* until all discovered rports are deleted from the
|
|
* FC transport class
|
|
*
|
|
* STATUS: OPTIONAL
|
|
*/
|
|
void (*disc_stop_final) (struct fc_lport *);
|
|
};
|
|
|
|
/* information used by the discovery layer */
|
|
struct fc_disc {
|
|
unsigned char retry_count;
|
|
unsigned char pending;
|
|
unsigned char requested;
|
|
unsigned short seq_count;
|
|
unsigned char buf_len;
|
|
u16 disc_id;
|
|
|
|
void (*disc_callback)(struct fc_lport *,
|
|
enum fc_disc_event);
|
|
|
|
struct list_head rports;
|
|
struct fc_lport *lport;
|
|
struct mutex disc_mutex;
|
|
struct fc_gpn_ft_resp partial_buf; /* partial name buffer */
|
|
struct delayed_work disc_work;
|
|
};
|
|
|
|
struct fc_lport {
|
|
struct list_head list;
|
|
|
|
/* Associations */
|
|
struct Scsi_Host *host;
|
|
struct list_head ema_list;
|
|
struct fc_rport_priv *dns_rp;
|
|
struct fc_rport_priv *ptp_rp;
|
|
void *scsi_priv;
|
|
struct fc_disc disc;
|
|
|
|
/* Operational Information */
|
|
struct libfc_function_template tt;
|
|
u8 link_up;
|
|
u8 qfull;
|
|
enum fc_lport_state state;
|
|
unsigned long boot_time;
|
|
|
|
struct fc_host_statistics host_stats;
|
|
struct fcoe_dev_stats *dev_stats;
|
|
|
|
u64 wwpn;
|
|
u64 wwnn;
|
|
u8 retry_count;
|
|
|
|
/* Capabilities */
|
|
u32 sg_supp:1; /* scatter gather supported */
|
|
u32 seq_offload:1; /* seq offload supported */
|
|
u32 crc_offload:1; /* crc offload supported */
|
|
u32 lro_enabled:1; /* large receive offload */
|
|
u32 mfs; /* max FC payload size */
|
|
unsigned int service_params;
|
|
unsigned int e_d_tov;
|
|
unsigned int r_a_tov;
|
|
u8 max_retry_count;
|
|
u8 max_rport_retry_count;
|
|
u16 link_speed;
|
|
u16 link_supported_speeds;
|
|
u16 lro_xid; /* max xid for fcoe lro */
|
|
unsigned int lso_max; /* max large send size */
|
|
struct fc_ns_fts fcts; /* FC-4 type masks */
|
|
struct fc_els_rnid_gen rnid_gen; /* RNID information */
|
|
|
|
/* Semaphores */
|
|
struct mutex lp_mutex;
|
|
|
|
/* Miscellaneous */
|
|
struct delayed_work retry_work;
|
|
struct delayed_work disc_work;
|
|
};
|
|
|
|
/*
|
|
* FC_LPORT HELPER FUNCTIONS
|
|
*****************************/
|
|
static inline int fc_lport_test_ready(struct fc_lport *lp)
|
|
{
|
|
return lp->state == LPORT_ST_READY;
|
|
}
|
|
|
|
static inline void fc_set_wwnn(struct fc_lport *lp, u64 wwnn)
|
|
{
|
|
lp->wwnn = wwnn;
|
|
}
|
|
|
|
static inline void fc_set_wwpn(struct fc_lport *lp, u64 wwnn)
|
|
{
|
|
lp->wwpn = wwnn;
|
|
}
|
|
|
|
static inline void fc_lport_state_enter(struct fc_lport *lp,
|
|
enum fc_lport_state state)
|
|
{
|
|
if (state != lp->state)
|
|
lp->retry_count = 0;
|
|
lp->state = state;
|
|
}
|
|
|
|
static inline int fc_lport_init_stats(struct fc_lport *lp)
|
|
{
|
|
/* allocate per cpu stats block */
|
|
lp->dev_stats = alloc_percpu(struct fcoe_dev_stats);
|
|
if (!lp->dev_stats)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static inline void fc_lport_free_stats(struct fc_lport *lp)
|
|
{
|
|
free_percpu(lp->dev_stats);
|
|
}
|
|
|
|
static inline struct fcoe_dev_stats *fc_lport_get_stats(struct fc_lport *lp)
|
|
{
|
|
return per_cpu_ptr(lp->dev_stats, smp_processor_id());
|
|
}
|
|
|
|
static inline void *lport_priv(const struct fc_lport *lp)
|
|
{
|
|
return (void *)(lp + 1);
|
|
}
|
|
|
|
/**
|
|
* libfc_host_alloc() - Allocate a Scsi_Host with room for the fc_lport
|
|
* @sht: ptr to the scsi host templ
|
|
* @priv_size: size of private data after fc_lport
|
|
*
|
|
* Returns: ptr to Scsi_Host
|
|
*/
|
|
static inline struct Scsi_Host *
|
|
libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
|
|
{
|
|
return scsi_host_alloc(sht, sizeof(struct fc_lport) + priv_size);
|
|
}
|
|
|
|
/*
|
|
* LOCAL PORT LAYER
|
|
*****************************/
|
|
int fc_lport_init(struct fc_lport *lp);
|
|
|
|
/*
|
|
* Destroy the specified local port by finding and freeing all
|
|
* fc_rports associated with it and then by freeing the fc_lport
|
|
* itself.
|
|
*/
|
|
int fc_lport_destroy(struct fc_lport *lp);
|
|
|
|
/*
|
|
* Logout the specified local port from the fabric
|
|
*/
|
|
int fc_fabric_logoff(struct fc_lport *lp);
|
|
|
|
/*
|
|
* Initiate the LP state machine. This handler will use fc_host_attr
|
|
* to store the FLOGI service parameters, so fc_host_attr must be
|
|
* initialized before calling this handler.
|
|
*/
|
|
int fc_fabric_login(struct fc_lport *lp);
|
|
|
|
/*
|
|
* The link is up for the given local port.
|
|
*/
|
|
void fc_linkup(struct fc_lport *);
|
|
|
|
/*
|
|
* Link is down for the given local port.
|
|
*/
|
|
void fc_linkdown(struct fc_lport *);
|
|
|
|
/*
|
|
* Configure the local port.
|
|
*/
|
|
int fc_lport_config(struct fc_lport *);
|
|
|
|
/*
|
|
* Reset the local port.
|
|
*/
|
|
int fc_lport_reset(struct fc_lport *);
|
|
|
|
/*
|
|
* Set the mfs or reset
|
|
*/
|
|
int fc_set_mfs(struct fc_lport *lp, u32 mfs);
|
|
|
|
|
|
/*
|
|
* REMOTE PORT LAYER
|
|
*****************************/
|
|
int fc_rport_init(struct fc_lport *lp);
|
|
void fc_rport_terminate_io(struct fc_rport *rp);
|
|
|
|
/*
|
|
* DISCOVERY LAYER
|
|
*****************************/
|
|
int fc_disc_init(struct fc_lport *lp);
|
|
|
|
|
|
/*
|
|
* SCSI LAYER
|
|
*****************************/
|
|
/*
|
|
* Initialize the SCSI block of libfc
|
|
*/
|
|
int fc_fcp_init(struct fc_lport *);
|
|
|
|
/*
|
|
* This section provides an API which allows direct interaction
|
|
* with the SCSI-ml. Each of these functions satisfies a function
|
|
* pointer defined in Scsi_Host and therefore is always called
|
|
* directly from the SCSI-ml.
|
|
*/
|
|
int fc_queuecommand(struct scsi_cmnd *sc_cmd,
|
|
void (*done)(struct scsi_cmnd *));
|
|
|
|
/*
|
|
* complete processing of a fcp packet
|
|
*
|
|
* This function may sleep if a fsp timer is pending.
|
|
* The host lock must not be held by caller.
|
|
*/
|
|
void fc_fcp_complete(struct fc_fcp_pkt *fsp);
|
|
|
|
/*
|
|
* Send an ABTS frame to the target device. The sc_cmd argument
|
|
* is a pointer to the SCSI command to be aborted.
|
|
*/
|
|
int fc_eh_abort(struct scsi_cmnd *sc_cmd);
|
|
|
|
/*
|
|
* Reset a LUN by sending send the tm cmd to the target.
|
|
*/
|
|
int fc_eh_device_reset(struct scsi_cmnd *sc_cmd);
|
|
|
|
/*
|
|
* Reset the host adapter.
|
|
*/
|
|
int fc_eh_host_reset(struct scsi_cmnd *sc_cmd);
|
|
|
|
/*
|
|
* Check rport status.
|
|
*/
|
|
int fc_slave_alloc(struct scsi_device *sdev);
|
|
|
|
/*
|
|
* Adjust the queue depth.
|
|
*/
|
|
int fc_change_queue_depth(struct scsi_device *sdev, int qdepth);
|
|
|
|
/*
|
|
* Change the tag type.
|
|
*/
|
|
int fc_change_queue_type(struct scsi_device *sdev, int tag_type);
|
|
|
|
/*
|
|
* Free memory pools used by the FCP layer.
|
|
*/
|
|
void fc_fcp_destroy(struct fc_lport *);
|
|
|
|
/*
|
|
* Set up direct-data placement for this I/O request
|
|
*/
|
|
void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid);
|
|
|
|
/*
|
|
* ELS/CT interface
|
|
*****************************/
|
|
/*
|
|
* Initializes ELS/CT interface
|
|
*/
|
|
int fc_elsct_init(struct fc_lport *lp);
|
|
|
|
|
|
/*
|
|
* EXCHANGE MANAGER LAYER
|
|
*****************************/
|
|
/*
|
|
* Initializes Exchange Manager related
|
|
* function pointers in struct libfc_function_template.
|
|
*/
|
|
int fc_exch_init(struct fc_lport *lp);
|
|
|
|
/*
|
|
* Adds Exchange Manager (EM) mp to lport.
|
|
*
|
|
* Adds specified mp to lport using struct fc_exch_mgr_anchor,
|
|
* the struct fc_exch_mgr_anchor allows same EM sharing by
|
|
* more than one lport with their specified match function,
|
|
* the match function is used in allocating exchange from
|
|
* added mp.
|
|
*/
|
|
struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport,
|
|
struct fc_exch_mgr *mp,
|
|
bool (*match)(struct fc_frame *));
|
|
|
|
/*
|
|
* Deletes Exchange Manager (EM) from lport by removing
|
|
* its anchor ema from lport.
|
|
*
|
|
* If removed anchor ema was the last user of its associated EM
|
|
* then also destroys associated EM.
|
|
*/
|
|
void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema);
|
|
|
|
/*
|
|
* Allocates an Exchange Manager (EM).
|
|
*
|
|
* The EM manages exchanges for their allocation and
|
|
* free, also allows exchange lookup for received
|
|
* frame.
|
|
*
|
|
* The class is used for initializing FC class of
|
|
* allocated exchange from EM.
|
|
*
|
|
* The min_xid and max_xid will limit new
|
|
* exchange ID (XID) within this range for
|
|
* a new exchange.
|
|
* The LLD may choose to have multiple EMs,
|
|
* e.g. one EM instance per CPU receive thread in LLD.
|
|
*
|
|
* Specified match function is used in allocating exchanges
|
|
* from newly allocated EM.
|
|
*/
|
|
struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp,
|
|
enum fc_class class,
|
|
u16 min_xid,
|
|
u16 max_xid,
|
|
bool (*match)(struct fc_frame *));
|
|
|
|
/*
|
|
* Free all exchange managers of a lport.
|
|
*/
|
|
void fc_exch_mgr_free(struct fc_lport *lport);
|
|
|
|
/*
|
|
* Receive a frame on specified local port and exchange manager.
|
|
*/
|
|
void fc_exch_recv(struct fc_lport *lp, struct fc_frame *fp);
|
|
|
|
/*
|
|
* This function is for exch_seq_send function pointer in
|
|
* struct libfc_function_template, see comment block on
|
|
* exch_seq_send for description of this function.
|
|
*/
|
|
struct fc_seq *fc_exch_seq_send(struct fc_lport *lp,
|
|
struct fc_frame *fp,
|
|
void (*resp)(struct fc_seq *sp,
|
|
struct fc_frame *fp,
|
|
void *arg),
|
|
void (*destructor)(struct fc_seq *sp,
|
|
void *arg),
|
|
void *arg, u32 timer_msec);
|
|
|
|
/*
|
|
* send a frame using existing sequence and exchange.
|
|
*/
|
|
int fc_seq_send(struct fc_lport *lp, struct fc_seq *sp, struct fc_frame *fp);
|
|
|
|
/*
|
|
* Send ELS response using mainly infomation
|
|
* in exchange and sequence in EM layer.
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*/
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void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd,
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struct fc_seq_els_data *els_data);
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|
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|
/*
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|
* This function is for seq_exch_abort function pointer in
|
|
* struct libfc_function_template, see comment block on
|
|
* seq_exch_abort for description of this function.
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|
*/
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int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec);
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|
|
|
/*
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|
* Indicate that an exchange/sequence tuple is complete and the memory
|
|
* allocated for the related objects may be freed.
|
|
*/
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|
void fc_exch_done(struct fc_seq *sp);
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|
|
|
/*
|
|
* Allocate a new exchange and sequence pair.
|
|
*/
|
|
struct fc_exch *fc_exch_alloc(struct fc_lport *lport, struct fc_frame *fp);
|
|
/*
|
|
* Start a new sequence on the same exchange as the supplied sequence.
|
|
*/
|
|
struct fc_seq *fc_seq_start_next(struct fc_seq *sp);
|
|
|
|
|
|
/*
|
|
* Reset all EMs of a lport, releasing its all sequences and
|
|
* exchanges. If sid is non-zero, then reset only exchanges
|
|
* we sourced from that FID. If did is non-zero, reset only
|
|
* exchanges destined to that FID.
|
|
*/
|
|
void fc_exch_mgr_reset(struct fc_lport *, u32 s_id, u32 d_id);
|
|
|
|
/*
|
|
* Functions for fc_functions_template
|
|
*/
|
|
void fc_get_host_speed(struct Scsi_Host *shost);
|
|
void fc_get_host_port_type(struct Scsi_Host *shost);
|
|
void fc_get_host_port_state(struct Scsi_Host *shost);
|
|
void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout);
|
|
struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *);
|
|
|
|
/*
|
|
* module setup functions.
|
|
*/
|
|
int fc_setup_exch_mgr(void);
|
|
void fc_destroy_exch_mgr(void);
|
|
int fc_setup_rport(void);
|
|
void fc_destroy_rport(void);
|
|
|
|
/*
|
|
* Internal libfc functions.
|
|
*/
|
|
const char *fc_els_resp_type(struct fc_frame *);
|
|
|
|
#endif /* _LIBFC_H_ */
|