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[SCSI] libfc: A modular Fibre Channel library 

libFC is composed of 4 blocks supported by an exchange manager
and a framing library. The upper 4 layers are fc_lport, fc_disc,
fc_rport and fc_fcp. A LLD that uses libfc could choose to
either use libfc's block, or using the transport template
defined in libfc.h, override one or more blocks with its own
implementation.

The EM (Exchange Manager) manages exhcanges/sequences for all
commands- ELS, CT and FCP.

The framing library frames ELS and CT commands.

The fc_lport block manages the library's representation of the
host's FC enabled ports.

The fc_disc block manages discovery of targets as well as
handling changes that occur in the FC fabric (via. RSCN events).

The fc_rport block manages the library's representation of other
entities in the FC fabric. Currently the library uses this block
for targets, its peer when in point-to-point mode and the
directory server, but can be extended for other entities if
needed.

The fc_fcp block interacts with the scsi-ml and handles all
I/O.

Signed-off-by: Robert Love <robert.w.love@intel.com>
[jejb: added include of delay.h to fix ppc64 compile prob spotted by sfr]
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Robert Love 2008-12-09 15:10:17 -08:00 коммит произвёл James Bottomley
Родитель f032c2f7cd
Коммит 42e9a92fe6
13 изменённых файлов: 9509 добавлений и 0 удалений
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6
drivers/scsi/Kconfig
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@ -603,6 +603,12 @@ config SCSI_FLASHPOINT
substantial, so users of MultiMaster Host Adapters may not
wish to include it.
config LIBFC
tristate "LibFC module"
depends on SCSI && SCSI_FC_ATTRS
---help---
Fibre Channel library module
config SCSI_DMX3191D
tristate "DMX3191D SCSI support"
depends on PCI && SCSI

1
drivers/scsi/Makefile
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@ -36,6 +36,7 @@ obj-$(CONFIG_SCSI_SAS_LIBSAS) += libsas/
obj-$(CONFIG_SCSI_SRP_ATTRS) += scsi_transport_srp.o
obj-$(CONFIG_SCSI_DH) += device_handler/
obj-$(CONFIG_LIBFC) += libfc/
obj-$(CONFIG_ISCSI_TCP) += libiscsi.o libiscsi_tcp.o iscsi_tcp.o
obj-$(CONFIG_INFINIBAND_ISER) += libiscsi.o
obj-$(CONFIG_SCSI_A4000T) += 53c700.o a4000t.o

12
drivers/scsi/libfc/Makefile Normal file
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@ -0,0 +1,12 @@
# $Id: Makefile
obj-$(CONFIG_LIBFC) += libfc.o
libfc-objs := \
fc_disc.o \
fc_exch.o \
fc_elsct.o \
fc_frame.o \
fc_lport.o \
fc_rport.o \
fc_fcp.o

845
drivers/scsi/libfc/fc_disc.c Normal file
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@ -0,0 +1,845 @@
/*
* Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* Maintained at www.Open-FCoE.org
*/
/*
* Target Discovery
*
* This block discovers all FC-4 remote ports, including FCP initiators. It
* also handles RSCN events and re-discovery if necessary.
*/
/*
* DISC LOCKING
*
* The disc mutex is can be locked when acquiring rport locks, but may not
* be held when acquiring the lport lock. Refer to fc_lport.c for more
* details.
*/
#include <linux/timer.h>
#include <linux/err.h>
#include <asm/unaligned.h>
#include <scsi/fc/fc_gs.h>
#include <scsi/libfc.h>
#define FC_DISC_RETRY_LIMIT 3 /* max retries */
#define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */
#define FC_DISC_DELAY 3
static int fc_disc_debug;
#define FC_DEBUG_DISC(fmt...) \
do { \
if (fc_disc_debug) \
FC_DBG(fmt); \
} while (0)
static void fc_disc_gpn_ft_req(struct fc_disc *);
static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *);
static int fc_disc_new_target(struct fc_disc *, struct fc_rport *,
struct fc_rport_identifiers *);
static void fc_disc_del_target(struct fc_disc *, struct fc_rport *);
static void fc_disc_done(struct fc_disc *);
static void fc_disc_timeout(struct work_struct *);
static void fc_disc_single(struct fc_disc *, struct fc_disc_port *);
static void fc_disc_restart(struct fc_disc *);
/**
* fc_disc_lookup_rport - lookup a remote port by port_id
* @lport: Fibre Channel host port instance
* @port_id: remote port port_id to match
*/
struct fc_rport *fc_disc_lookup_rport(const struct fc_lport *lport,
u32 port_id)
{
const struct fc_disc *disc = &lport->disc;
struct fc_rport *rport, *found = NULL;
struct fc_rport_libfc_priv *rdata;
int disc_found = 0;
list_for_each_entry(rdata, &disc->rports, peers) {
rport = PRIV_TO_RPORT(rdata);
if (rport->port_id == port_id) {
disc_found = 1;
found = rport;
break;
}
}
if (!disc_found)
found = NULL;
return found;
}
/**
* fc_disc_stop_rports - delete all the remote ports associated with the lport
* @disc: The discovery job to stop rports on
*
* Locking Note: This function expects that the lport mutex is locked before
* calling it.
*/
void fc_disc_stop_rports(struct fc_disc *disc)
{
struct fc_lport *lport;
struct fc_rport *rport;
struct fc_rport_libfc_priv *rdata, *next;
lport = disc->lport;
mutex_lock(&disc->disc_mutex);
list_for_each_entry_safe(rdata, next, &disc->rports, peers) {
rport = PRIV_TO_RPORT(rdata);
list_del(&rdata->peers);
lport->tt.rport_logoff(rport);
}
mutex_unlock(&disc->disc_mutex);
}
/**
* fc_disc_rport_callback - Event handler for rport events
* @lport: The lport which is receiving the event
* @rport: The rport which the event has occured on
* @event: The event that occured
*
* Locking Note: The rport lock should not be held when calling
* this function.
*/
static void fc_disc_rport_callback(struct fc_lport *lport,
struct fc_rport *rport,
enum fc_rport_event event)
{
struct fc_rport_libfc_priv *rdata = rport->dd_data;
struct fc_disc *disc = &lport->disc;
int found = 0;
FC_DEBUG_DISC("Received a %d event for port (%6x)\n", event,
rport->port_id);
if (event == RPORT_EV_CREATED) {
if (disc) {
found = 1;
mutex_lock(&disc->disc_mutex);
list_add_tail(&rdata->peers, &disc->rports);
mutex_unlock(&disc->disc_mutex);
}
}
if (!found)
FC_DEBUG_DISC("The rport (%6x) is not maintained "
"by the discovery layer\n", rport->port_id);
}
/**
* fc_disc_recv_rscn_req - Handle Registered State Change Notification (RSCN)
* @sp: Current sequence of the RSCN exchange
* @fp: RSCN Frame
* @lport: Fibre Channel host port instance
*
* Locking Note: This function expects that the disc_mutex is locked
* before it is called.
*/
static void fc_disc_recv_rscn_req(struct fc_seq *sp, struct fc_frame *fp,
struct fc_disc *disc)
{
struct fc_lport *lport;
struct fc_rport *rport;
struct fc_rport_libfc_priv *rdata;
struct fc_els_rscn *rp;
struct fc_els_rscn_page *pp;
struct fc_seq_els_data rjt_data;
unsigned int len;
int redisc = 0;
enum fc_els_rscn_ev_qual ev_qual;
enum fc_els_rscn_addr_fmt fmt;
LIST_HEAD(disc_ports);
struct fc_disc_port *dp, *next;
lport = disc->lport;
FC_DEBUG_DISC("Received an RSCN event on port (%6x)\n",
fc_host_port_id(lport->host));
/* make sure the frame contains an RSCN message */
rp = fc_frame_payload_get(fp, sizeof(*rp));
if (!rp)
goto reject;
/* make sure the page length is as expected (4 bytes) */
if (rp->rscn_page_len != sizeof(*pp))
goto reject;
/* get the RSCN payload length */
len = ntohs(rp->rscn_plen);
if (len < sizeof(*rp))
goto reject;
/* make sure the frame contains the expected payload */
rp = fc_frame_payload_get(fp, len);
if (!rp)
goto reject;
/* payload must be a multiple of the RSCN page size */
len -= sizeof(*rp);
if (len % sizeof(*pp))
goto reject;
for (pp = (void *)(rp + 1); len > 0; len -= sizeof(*pp), pp++) {
ev_qual = pp->rscn_page_flags >> ELS_RSCN_EV_QUAL_BIT;
ev_qual &= ELS_RSCN_EV_QUAL_MASK;
fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT;
fmt &= ELS_RSCN_ADDR_FMT_MASK;
/*
* if we get an address format other than port
* (area, domain, fabric), then do a full discovery
*/
switch (fmt) {
case ELS_ADDR_FMT_PORT:
FC_DEBUG_DISC("Port address format for port (%6x)\n",
ntoh24(pp->rscn_fid));
dp = kzalloc(sizeof(*dp), GFP_KERNEL);
if (!dp) {
redisc = 1;
break;
}
dp->lp = lport;
dp->ids.port_id = ntoh24(pp->rscn_fid);
dp->ids.port_name = -1;
dp->ids.node_name = -1;
dp->ids.roles = FC_RPORT_ROLE_UNKNOWN;
list_add_tail(&dp->peers, &disc_ports);
break;
case ELS_ADDR_FMT_AREA:
case ELS_ADDR_FMT_DOM:
case ELS_ADDR_FMT_FAB:
default:
FC_DEBUG_DISC("Address format is (%d)\n", fmt);
redisc = 1;
break;
}
}
lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
if (redisc) {
FC_DEBUG_DISC("RSCN received: rediscovering\n");
fc_disc_restart(disc);
} else {
FC_DEBUG_DISC("RSCN received: not rediscovering. "
"redisc %d state %d in_prog %d\n",
redisc, lport->state, disc->pending);
list_for_each_entry_safe(dp, next, &disc_ports, peers) {
list_del(&dp->peers);
rport = lport->tt.rport_lookup(lport, dp->ids.port_id);
if (rport) {
rdata = RPORT_TO_PRIV(rport);
list_del(&rdata->peers);
lport->tt.rport_logoff(rport);
}
fc_disc_single(disc, dp);
}
}
fc_frame_free(fp);
return;
reject:
FC_DEBUG_DISC("Received a bad RSCN frame\n");
rjt_data.fp = NULL;
rjt_data.reason = ELS_RJT_LOGIC;
rjt_data.explan = ELS_EXPL_NONE;
lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
fc_frame_free(fp);
}
/**
* fc_disc_recv_req - Handle incoming requests
* @sp: Current sequence of the request exchange
* @fp: The frame
* @lport: The FC local port
*
* Locking Note: This function is called from the EM and will lock
* the disc_mutex before calling the handler for the
* request.
*/
static void fc_disc_recv_req(struct fc_seq *sp, struct fc_frame *fp,
struct fc_lport *lport)
{
u8 op;
struct fc_disc *disc = &lport->disc;
op = fc_frame_payload_op(fp);
switch (op) {
case ELS_RSCN:
mutex_lock(&disc->disc_mutex);
fc_disc_recv_rscn_req(sp, fp, disc);
mutex_unlock(&disc->disc_mutex);
break;
default:
FC_DBG("Received an unsupported request. opcode (%x)\n", op);
break;
}
}
/**
* fc_disc_restart - Restart discovery
* @lport: FC discovery context
*
* Locking Note: This function expects that the disc mutex
* is already locked.
*/
static void fc_disc_restart(struct fc_disc *disc)
{
struct fc_rport *rport;
struct fc_rport_libfc_priv *rdata, *next;
struct fc_lport *lport = disc->lport;
FC_DEBUG_DISC("Restarting discovery for port (%6x)\n",
fc_host_port_id(lport->host));
list_for_each_entry_safe(rdata, next, &disc->rports, peers) {
rport = PRIV_TO_RPORT(rdata);
FC_DEBUG_DISC("list_del(%6x)\n", rport->port_id);
list_del(&rdata->peers);
lport->tt.rport_logoff(rport);
}
disc->requested = 1;
if (!disc->pending)
fc_disc_gpn_ft_req(disc);
}
/**
* fc_disc_start - Fibre Channel Target discovery
* @lport: FC local port
*
* Returns non-zero if discovery cannot be started.
*/
static void fc_disc_start(void (*disc_callback)(struct fc_lport *,
enum fc_disc_event),
struct fc_lport *lport)
{
struct fc_rport *rport;
struct fc_rport_identifiers ids;
struct fc_disc *disc = &lport->disc;
/*
* At this point we may have a new disc job or an existing
* one. Either way, let's lock when we make changes to it
* and send the GPN_FT request.
*/
mutex_lock(&disc->disc_mutex);
disc->disc_callback = disc_callback;
/*
* If not ready, or already running discovery, just set request flag.
*/
disc->requested = 1;
if (disc->pending) {
mutex_unlock(&disc->disc_mutex);
return;
}
/*
* Handle point-to-point mode as a simple discovery
* of the remote port. Yucky, yucky, yuck, yuck!
*/
rport = disc->lport->ptp_rp;
if (rport) {
ids.port_id = rport->port_id;
ids.port_name = rport->port_name;
ids.node_name = rport->node_name;
ids.roles = FC_RPORT_ROLE_UNKNOWN;
get_device(&rport->dev);
if (!fc_disc_new_target(disc, rport, &ids)) {
disc->event = DISC_EV_SUCCESS;
fc_disc_done(disc);
}
put_device(&rport->dev);
} else {
fc_disc_gpn_ft_req(disc); /* get ports by FC-4 type */
}
mutex_unlock(&disc->disc_mutex);
}
static struct fc_rport_operations fc_disc_rport_ops = {
.event_callback = fc_disc_rport_callback,
};
/**
* fc_disc_new_target - Handle new target found by discovery
* @lport: FC local port
* @rport: The previous FC remote port (NULL if new remote port)
* @ids: Identifiers for the new FC remote port
*
* Locking Note: This function expects that the disc_mutex is locked
* before it is called.
*/
static int fc_disc_new_target(struct fc_disc *disc,
struct fc_rport *rport,
struct fc_rport_identifiers *ids)
{
struct fc_lport *lport = disc->lport;
struct fc_rport_libfc_priv *rp;
int error = 0;
if (rport && ids->port_name) {
if (rport->port_name == -1) {
/*
* Set WWN and fall through to notify of create.
*/
fc_rport_set_name(rport, ids->port_name,
rport->node_name);
} else if (rport->port_name != ids->port_name) {
/*
* This is a new port with the same FCID as
* a previously-discovered port. Presumably the old
* port logged out and a new port logged in and was
* assigned the same FCID. This should be rare.
* Delete the old one and fall thru to re-create.
*/
fc_disc_del_target(disc, rport);
rport = NULL;
}
}
if (((ids->port_name != -1) || (ids->port_id != -1)) &&
ids->port_id != fc_host_port_id(lport->host) &&
ids->port_name != lport->wwpn) {
if (!rport) {
rport = lport->tt.rport_lookup(lport, ids->port_id);
if (!rport) {
struct fc_disc_port dp;
dp.lp = lport;
dp.ids.port_id = ids->port_id;
dp.ids.port_name = ids->port_name;
dp.ids.node_name = ids->node_name;
dp.ids.roles = ids->roles;
rport = fc_rport_rogue_create(&dp);
}
if (!rport)
error = -ENOMEM;
}
if (rport) {
rp = rport->dd_data;
rp->ops = &fc_disc_rport_ops;
rp->rp_state = RPORT_ST_INIT;
lport->tt.rport_login(rport);
}
}
return error;
}
/**
* fc_disc_del_target - Delete a target
* @disc: FC discovery context
* @rport: The remote port to be removed
*/
static void fc_disc_del_target(struct fc_disc *disc, struct fc_rport *rport)
{
struct fc_lport *lport = disc->lport;
struct fc_rport_libfc_priv *rdata = RPORT_TO_PRIV(rport);
list_del(&rdata->peers);
lport->tt.rport_logoff(rport);
}
/**
* fc_disc_done - Discovery has been completed
* @disc: FC discovery context
*/
static void fc_disc_done(struct fc_disc *disc)
{
struct fc_lport *lport = disc->lport;
FC_DEBUG_DISC("Discovery complete for port (%6x)\n",
fc_host_port_id(lport->host));
disc->disc_callback(lport, disc->event);
disc->event = DISC_EV_NONE;
if (disc->requested)
fc_disc_gpn_ft_req(disc);
else
disc->pending = 0;
}
/**
* fc_disc_error - Handle error on dNS request
* @disc: FC discovery context
* @fp: The frame pointer
*/
static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp)
{
struct fc_lport *lport = disc->lport;
unsigned long delay = 0;
if (fc_disc_debug)
FC_DBG("Error %ld, retries %d/%d\n",
PTR_ERR(fp), disc->retry_count,
FC_DISC_RETRY_LIMIT);
if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) {
/*
* Memory allocation failure, or the exchange timed out,
* retry after delay.
*/
if (disc->retry_count < FC_DISC_RETRY_LIMIT) {
/* go ahead and retry */
if (!fp)
delay = msecs_to_jiffies(FC_DISC_RETRY_DELAY);
else {
delay = msecs_to_jiffies(lport->e_d_tov);
/* timeout faster first time */
if (!disc->retry_count)
delay /= 4;
}
disc->retry_count++;
schedule_delayed_work(&disc->disc_work, delay);
} else {
/* exceeded retries */
disc->event = DISC_EV_FAILED;
fc_disc_done(disc);
}
}
}
/**
* fc_disc_gpn_ft_req - Send Get Port Names by FC-4 type (GPN_FT) request
* @lport: FC discovery context
*
* Locking Note: This function expects that the disc_mutex is locked
* before it is called.
*/
static void fc_disc_gpn_ft_req(struct fc_disc *disc)
{
struct fc_frame *fp;
struct fc_lport *lport = disc->lport;
WARN_ON(!fc_lport_test_ready(lport));
disc->pending = 1;
disc->requested = 0;
disc->buf_len = 0;
disc->seq_count = 0;
fp = fc_frame_alloc(lport,
sizeof(struct fc_ct_hdr) +
sizeof(struct fc_ns_gid_ft));
if (!fp)
goto err;
if (lport->tt.elsct_send(lport, NULL, fp,
FC_NS_GPN_FT,
fc_disc_gpn_ft_resp,
disc, lport->e_d_tov))
return;
err:
fc_disc_error(disc, fp);
}
/**
* fc_disc_gpn_ft_parse - Parse the list of IDs and names resulting from a request
* @lport: Fibre Channel host port instance
* @buf: GPN_FT response buffer
* @len: size of response buffer
*/
static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len)
{
struct fc_lport *lport;
struct fc_gpn_ft_resp *np;
char *bp;
size_t plen;
size_t tlen;
int error = 0;
struct fc_disc_port dp;
struct fc_rport *rport;
struct fc_rport_libfc_priv *rdata;
lport = disc->lport;
/*
* Handle partial name record left over from previous call.
*/
bp = buf;
plen = len;
np = (struct fc_gpn_ft_resp *)bp;
tlen = disc->buf_len;
if (tlen) {
WARN_ON(tlen >= sizeof(*np));
plen = sizeof(*np) - tlen;
WARN_ON(plen <= 0);
WARN_ON(plen >= sizeof(*np));
if (plen > len)
plen = len;
np = &disc->partial_buf;
memcpy((char *)np + tlen, bp, plen);
/*
* Set bp so that the loop below will advance it to the
* first valid full name element.
*/
bp -= tlen;
len += tlen;
plen += tlen;
disc->buf_len = (unsigned char) plen;
if (plen == sizeof(*np))
disc->buf_len = 0;
}
/*
* Handle full name records, including the one filled from above.
* Normally, np == bp and plen == len, but from the partial case above,
* bp, len describe the overall buffer, and np, plen describe the
* partial buffer, which if would usually be full now.
* After the first time through the loop, things return to "normal".
*/
while (plen >= sizeof(*np)) {
dp.lp = lport;
dp.ids.port_id = ntoh24(np->fp_fid);
dp.ids.port_name = ntohll(np->fp_wwpn);
dp.ids.node_name = -1;
dp.ids.roles = FC_RPORT_ROLE_UNKNOWN;
if ((dp.ids.port_id != fc_host_port_id(lport->host)) &&
(dp.ids.port_name != lport->wwpn)) {
rport = fc_rport_rogue_create(&dp);
if (rport) {
rdata = rport->dd_data;
rdata->ops = &fc_disc_rport_ops;
rdata->local_port = lport;
lport->tt.rport_login(rport);
} else
FC_DBG("Failed to allocate memory for "
"the newly discovered port (%6x)\n",
dp.ids.port_id);
}
if (np->fp_flags & FC_NS_FID_LAST) {
disc->event = DISC_EV_SUCCESS;
fc_disc_done(disc);
len = 0;
break;
}
len -= sizeof(*np);
bp += sizeof(*np);
np = (struct fc_gpn_ft_resp *)bp;
plen = len;
}
/*
* Save any partial record at the end of the buffer for next time.
*/
if (error == 0 && len > 0 && len < sizeof(*np)) {
if (np != &disc->partial_buf) {
FC_DEBUG_DISC("Partial buffer remains "
"for discovery by (%6x)\n",
fc_host_port_id(lport->host));
memcpy(&disc->partial_buf, np, len);
}
disc->buf_len = (unsigned char) len;
} else {
disc->buf_len = 0;
}
return error;
}
/*
* Handle retry of memory allocation for remote ports.
*/
static void fc_disc_timeout(struct work_struct *work)
{
struct fc_disc *disc = container_of(work,
struct fc_disc,
disc_work.work);
mutex_lock(&disc->disc_mutex);
if (disc->requested && !disc->pending)
fc_disc_gpn_ft_req(disc);
mutex_unlock(&disc->disc_mutex);
}
/**
* fc_disc_gpn_ft_resp - Handle a response frame from Get Port Names (GPN_FT)
* @sp: Current sequence of GPN_FT exchange
* @fp: response frame
* @lp_arg: Fibre Channel host port instance
*
* Locking Note: This function expects that the disc_mutex is locked
* before it is called.
*/
static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp,
void *disc_arg)
{
struct fc_disc *disc = disc_arg;
struct fc_ct_hdr *cp;
struct fc_frame_header *fh;
unsigned int seq_cnt;
void *buf = NULL;
unsigned int len;
int error;
FC_DEBUG_DISC("Received a GPN_FT response on port (%6x)\n",
fc_host_port_id(disc->lport->host));
if (IS_ERR(fp)) {
fc_disc_error(disc, fp);
return;
}
WARN_ON(!fc_frame_is_linear(fp)); /* buffer must be contiguous */
fh = fc_frame_header_get(fp);
len = fr_len(fp) - sizeof(*fh);
seq_cnt = ntohs(fh->fh_seq_cnt);
if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 &&
disc->seq_count == 0) {
cp = fc_frame_payload_get(fp, sizeof(*cp));
if (!cp) {
FC_DBG("GPN_FT response too short, len %d\n",
fr_len(fp));
} else if (ntohs(cp->ct_cmd) == FC_FS_ACC) {
/*
* Accepted. Parse response.
*/
buf = cp + 1;
len -= sizeof(*cp);
} else if (ntohs(cp->ct_cmd) == FC_FS_RJT) {
FC_DBG("GPN_FT rejected reason %x exp %x "
"(check zoning)\n", cp->ct_reason,
cp->ct_explan);
disc->event = DISC_EV_FAILED;
fc_disc_done(disc);
} else {
FC_DBG("GPN_FT unexpected response code %x\n",
ntohs(cp->ct_cmd));
}
} else if (fr_sof(fp) == FC_SOF_N3 &&
seq_cnt == disc->seq_count) {
buf = fh + 1;
} else {
FC_DBG("GPN_FT unexpected frame - out of sequence? "
"seq_cnt %x expected %x sof %x eof %x\n",
seq_cnt, disc->seq_count, fr_sof(fp), fr_eof(fp));
}
if (buf) {
error = fc_disc_gpn_ft_parse(disc, buf, len);
if (error)
fc_disc_error(disc, fp);
else
disc->seq_count++;
}
fc_frame_free(fp);
}
/**
* fc_disc_single - Discover the directory information for a single target
* @lport: FC local port
* @dp: The port to rediscover
*
* Locking Note: This function expects that the disc_mutex is locked
* before it is called.
*/
static void fc_disc_single(struct fc_disc *disc, struct fc_disc_port *dp)
{
struct fc_lport *lport;
struct fc_rport *rport;
struct fc_rport *new_rport;
struct fc_rport_libfc_priv *rdata;
lport = disc->lport;
if (dp->ids.port_id == fc_host_port_id(lport->host))
goto out;
rport = lport->tt.rport_lookup(lport, dp->ids.port_id);
if (rport)
fc_disc_del_target(disc, rport);
new_rport = fc_rport_rogue_create(dp);
if (new_rport) {
rdata = new_rport->dd_data;
rdata->ops = &fc_disc_rport_ops;
kfree(dp);
lport->tt.rport_login(new_rport);
}
return;
out:
kfree(dp);
}
/**
* fc_disc_stop - Stop discovery for a given lport
* @lport: The lport that discovery should stop for
*/
void fc_disc_stop(struct fc_lport *lport)
{
struct fc_disc *disc = &lport->disc;
if (disc) {
cancel_delayed_work_sync(&disc->disc_work);
fc_disc_stop_rports(disc);
}
}
/**
* fc_disc_stop_final - Stop discovery for a given lport
* @lport: The lport that discovery should stop for
*
* This function will block until discovery has been
* completely stopped and all rports have been deleted.
*/
void fc_disc_stop_final(struct fc_lport *lport)
{
fc_disc_stop(lport);
lport->tt.rport_flush_queue();
}
/**
* fc_disc_init - Initialize the discovery block
* @lport: FC local port
*/
int fc_disc_init(struct fc_lport *lport)
{
struct fc_disc *disc;
if (!lport->tt.disc_start)
lport->tt.disc_start = fc_disc_start;
if (!lport->tt.disc_stop)
lport->tt.disc_stop = fc_disc_stop;
if (!lport->tt.disc_stop_final)
lport->tt.disc_stop_final = fc_disc_stop_final;
if (!lport->tt.disc_recv_req)
lport->tt.disc_recv_req = fc_disc_recv_req;
if (!lport->tt.rport_lookup)
lport->tt.rport_lookup = fc_disc_lookup_rport;
disc = &lport->disc;
INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout);
mutex_init(&disc->disc_mutex);
INIT_LIST_HEAD(&disc->rports);
disc->lport = lport;
disc->delay = FC_DISC_DELAY;
disc->event = DISC_EV_NONE;
return 0;
}
EXPORT_SYMBOL(fc_disc_init);

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drivers/scsi/libfc/fc_elsct.c Normal file
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/*
* Copyright(c) 2008 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* Maintained at www.Open-FCoE.org
*/
/*
* Provide interface to send ELS/CT FC frames
*/
#include <asm/unaligned.h>
#include <scsi/fc/fc_gs.h>
#include <scsi/fc/fc_ns.h>
#include <scsi/fc/fc_els.h>
#include <scsi/libfc.h>
#include <scsi/fc_encode.h>
/*
* fc_elsct_send - sends ELS/CT frame
*/
static struct fc_seq *fc_elsct_send(struct fc_lport *lport,
struct fc_rport *rport,
struct fc_frame *fp,
unsigned int op,
void (*resp)(struct fc_seq *,
struct fc_frame *fp,
void *arg),
void *arg, u32 timer_msec)
{
enum fc_rctl r_ctl;
u32 did;
enum fc_fh_type fh_type;
int rc;
/* ELS requests */
if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS))
rc = fc_els_fill(lport, rport, fp, op, &r_ctl, &did, &fh_type);
else
/* CT requests */
rc = fc_ct_fill(lport, fp, op, &r_ctl, &did, &fh_type);
if (rc)
return NULL;
fc_fill_fc_hdr(fp, r_ctl, did, fc_host_port_id(lport->host), fh_type,
FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
return lport->tt.exch_seq_send(lport, fp, resp, NULL, arg, timer_msec);
}
int fc_elsct_init(struct fc_lport *lport)
{
if (!lport->tt.elsct_send)
lport->tt.elsct_send = fc_elsct_send;
return 0;
}
EXPORT_SYMBOL(fc_elsct_init);

1970
drivers/scsi/libfc/fc_exch.c Normal file
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2131
drivers/scsi/libfc/fc_fcp.c Normal file
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drivers/scsi/libfc/fc_frame.c Normal file
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/*
* Copyright(c) 2007 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* Maintained at www.Open-FCoE.org
*/
/*
* Frame allocation.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/crc32.h>
#include <scsi/fc_frame.h>
/*
* Check the CRC in a frame.
*/
u32 fc_frame_crc_check(struct fc_frame *fp)
{
u32 crc;
u32 error;
const u8 *bp;
unsigned int len;
WARN_ON(!fc_frame_is_linear(fp));
fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
len = (fr_len(fp) + 3) & ~3; /* round up length to include fill */
bp = (const u8 *) fr_hdr(fp);
crc = ~crc32(~0, bp, len);
error = crc ^ fr_crc(fp);
return error;
}
EXPORT_SYMBOL(fc_frame_crc_check);
/*
* Allocate a frame intended to be sent via fcoe_xmit.
* Get an sk_buff for the frame and set the length.
*/
struct fc_frame *__fc_frame_alloc(size_t len)
{
struct fc_frame *fp;
struct sk_buff *skb;
WARN_ON((len % sizeof(u32)) != 0);
len += sizeof(struct fc_frame_header);
skb = dev_alloc_skb(len + FC_FRAME_HEADROOM + FC_FRAME_TAILROOM);
if (!skb)
return NULL;
fp = (struct fc_frame *) skb;
fc_frame_init(fp);
skb_reserve(skb, FC_FRAME_HEADROOM);
skb_put(skb, len);
return fp;
}
EXPORT_SYMBOL(__fc_frame_alloc);
struct fc_frame *fc_frame_alloc_fill(struct fc_lport *lp, size_t payload_len)
{
struct fc_frame *fp;
size_t fill;
fill = payload_len % 4;
if (fill != 0)
fill = 4 - fill;
fp = __fc_frame_alloc(payload_len + fill);
if (fp) {
memset((char *) fr_hdr(fp) + payload_len, 0, fill);
/* trim is OK, we just allocated it so there are no fragments */
skb_trim(fp_skb(fp),
payload_len + sizeof(struct fc_frame_header));
}
return fp;
}

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drivers/scsi/libfc/fc_lport.c Normal file
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1291
drivers/scsi/libfc/fc_rport.c Normal file
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include/scsi/fc_encode.h Normal file
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/*
* Copyright(c) 2008 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* Maintained at www.Open-FCoE.org
*/
#ifndef _FC_ENCODE_H_
#define _FC_ENCODE_H_
#include <asm/unaligned.h>
struct fc_ns_rft {
struct fc_ns_fid fid; /* port ID object */
struct fc_ns_fts fts; /* FC4-types object */
};
struct fc_ct_req {
struct fc_ct_hdr hdr;
union {
struct fc_ns_gid_ft gid;
struct fc_ns_rn_id rn;
struct fc_ns_rft rft;
} payload;
};
/**
* fill FC header fields in specified fc_frame
*/
static inline void fc_fill_fc_hdr(struct fc_frame *fp, enum fc_rctl r_ctl,
u32 did, u32 sid, enum fc_fh_type type,
u32 f_ctl, u32 parm_offset)
{
struct fc_frame_header *fh;
fh = fc_frame_header_get(fp);
WARN_ON(r_ctl == 0);
fh->fh_r_ctl = r_ctl;
hton24(fh->fh_d_id, did);
hton24(fh->fh_s_id, sid);
fh->fh_type = type;
hton24(fh->fh_f_ctl, f_ctl);
fh->fh_cs_ctl = 0;
fh->fh_df_ctl = 0;
fh->fh_parm_offset = htonl(parm_offset);
}
/**
* fc_ct_hdr_fill- fills ct header and reset ct payload
* returns pointer to ct request.
*/
static inline struct fc_ct_req *fc_ct_hdr_fill(const struct fc_frame *fp,
unsigned int op, size_t req_size)
{
struct fc_ct_req *ct;
size_t ct_plen;
ct_plen = sizeof(struct fc_ct_hdr) + req_size;
ct = fc_frame_payload_get(fp, ct_plen);
memset(ct, 0, ct_plen);
ct->hdr.ct_rev = FC_CT_REV;
ct->hdr.ct_fs_type = FC_FST_DIR;
ct->hdr.ct_fs_subtype = FC_NS_SUBTYPE;
ct->hdr.ct_cmd = htons((u16) op);
return ct;
}
/**
* fc_ct_fill - Fill in a name service request frame
*/
static inline int fc_ct_fill(struct fc_lport *lport, struct fc_frame *fp,
unsigned int op, enum fc_rctl *r_ctl, u32 *did,
enum fc_fh_type *fh_type)
{
struct fc_ct_req *ct;
switch (op) {
case FC_NS_GPN_FT:
ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_gid_ft));
ct->payload.gid.fn_fc4_type = FC_TYPE_FCP;
break;
case FC_NS_RFT_ID:
ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rft));
hton24(ct->payload.rft.fid.fp_fid,
fc_host_port_id(lport->host));
ct->payload.rft.fts = lport->fcts;
break;
case FC_NS_RPN_ID:
ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rn_id));
hton24(ct->payload.rn.fr_fid.fp_fid,
fc_host_port_id(lport->host));
ct->payload.rft.fts = lport->fcts;
put_unaligned_be64(lport->wwpn, &ct->payload.rn.fr_wwn);
break;
default:
FC_DBG("Invalid op code %x \n", op);
return -EINVAL;
}
*r_ctl = FC_RCTL_DD_UNSOL_CTL;
*did = FC_FID_DIR_SERV;
*fh_type = FC_TYPE_CT;
return 0;
}
/**
* fc_plogi_fill - Fill in plogi request frame
*/
static inline void fc_plogi_fill(struct fc_lport *lport, struct fc_frame *fp,
unsigned int op)
{
struct fc_els_flogi *plogi;
struct fc_els_csp *csp;
struct fc_els_cssp *cp;
plogi = fc_frame_payload_get(fp, sizeof(*plogi));
memset(plogi, 0, sizeof(*plogi));
plogi->fl_cmd = (u8) op;
put_unaligned_be64(lport->wwpn, &plogi->fl_wwpn);
put_unaligned_be64(lport->wwnn, &plogi->fl_wwnn);
csp = &plogi->fl_csp;
csp->sp_hi_ver = 0x20;
csp->sp_lo_ver = 0x20;
csp->sp_bb_cred = htons(10); /* this gets set by gateway */
csp->sp_bb_data = htons((u16) lport->mfs);
cp = &plogi->fl_cssp[3 - 1]; /* class 3 parameters */
cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
csp->sp_features = htons(FC_SP_FT_CIRO);
csp->sp_tot_seq = htons(255); /* seq. we accept */
csp->sp_rel_off = htons(0x1f);
csp->sp_e_d_tov = htonl(lport->e_d_tov);
cp->cp_rdfs = htons((u16) lport->mfs);
cp->cp_con_seq = htons(255);
cp->cp_open_seq = 1;
}
/**
* fc_flogi_fill - Fill in a flogi request frame.
*/
static inline void fc_flogi_fill(struct fc_lport *lport, struct fc_frame *fp)
{
struct fc_els_csp *sp;
struct fc_els_cssp *cp;
struct fc_els_flogi *flogi;
flogi = fc_frame_payload_get(fp, sizeof(*flogi));
memset(flogi, 0, sizeof(*flogi));
flogi->fl_cmd = (u8) ELS_FLOGI;
put_unaligned_be64(lport->wwpn, &flogi->fl_wwpn);
put_unaligned_be64(lport->wwnn, &flogi->fl_wwnn);
sp = &flogi->fl_csp;
sp->sp_hi_ver = 0x20;
sp->sp_lo_ver = 0x20;
sp->sp_bb_cred = htons(10); /* this gets set by gateway */
sp->sp_bb_data = htons((u16) lport->mfs);
cp = &flogi->fl_cssp[3 - 1]; /* class 3 parameters */
cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
}
/**
* fc_logo_fill - Fill in a logo request frame.
*/
static inline void fc_logo_fill(struct fc_lport *lport, struct fc_frame *fp)
{
struct fc_els_logo *logo;
logo = fc_frame_payload_get(fp, sizeof(*logo));
memset(logo, 0, sizeof(*logo));
logo->fl_cmd = ELS_LOGO;
hton24(logo->fl_n_port_id, fc_host_port_id(lport->host));
logo->fl_n_port_wwn = htonll(lport->wwpn);
}
/**
* fc_rtv_fill - Fill in RTV (read timeout value) request frame.
*/
static inline void fc_rtv_fill(struct fc_lport *lport, struct fc_frame *fp)
{
struct fc_els_rtv *rtv;
rtv = fc_frame_payload_get(fp, sizeof(*rtv));
memset(rtv, 0, sizeof(*rtv));
rtv->rtv_cmd = ELS_RTV;
}
/**
* fc_rec_fill - Fill in rec request frame
*/
static inline void fc_rec_fill(struct fc_lport *lport, struct fc_frame *fp)
{
struct fc_els_rec *rec;
struct fc_exch *ep = fc_seq_exch(fr_seq(fp));
rec = fc_frame_payload_get(fp, sizeof(*rec));
memset(rec, 0, sizeof(*rec));
rec->rec_cmd = ELS_REC;
hton24(rec->rec_s_id, fc_host_port_id(lport->host));
rec->rec_ox_id = htons(ep->oxid);
rec->rec_rx_id = htons(ep->rxid);
}
/**
* fc_prli_fill - Fill in prli request frame
*/
static inline void fc_prli_fill(struct fc_lport *lport, struct fc_frame *fp)
{
struct {
struct fc_els_prli prli;
struct fc_els_spp spp;
} *pp;
pp = fc_frame_payload_get(fp, sizeof(*pp));
memset(pp, 0, sizeof(*pp));
pp->prli.prli_cmd = ELS_PRLI;
pp->prli.prli_spp_len = sizeof(struct fc_els_spp);
pp->prli.prli_len = htons(sizeof(*pp));
pp->spp.spp_type = FC_TYPE_FCP;
pp->spp.spp_flags = FC_SPP_EST_IMG_PAIR;
pp->spp.spp_params = htonl(lport->service_params);
}
/**
* fc_scr_fill - Fill in a scr request frame.
*/
static inline void fc_scr_fill(struct fc_lport *lport, struct fc_frame *fp)
{
struct fc_els_scr *scr;
scr = fc_frame_payload_get(fp, sizeof(*scr));
memset(scr, 0, sizeof(*scr));
scr->scr_cmd = ELS_SCR;
scr->scr_reg_func = ELS_SCRF_FULL;
}
/**
* fc_els_fill - Fill in an ELS request frame
*/
static inline int fc_els_fill(struct fc_lport *lport, struct fc_rport *rport,
struct fc_frame *fp, unsigned int op,
enum fc_rctl *r_ctl, u32 *did, enum fc_fh_type *fh_type)
{
switch (op) {
case ELS_PLOGI:
fc_plogi_fill(lport, fp, ELS_PLOGI);
*did = rport->port_id;
break;
case ELS_FLOGI:
fc_flogi_fill(lport, fp);
*did = FC_FID_FLOGI;
break;
case ELS_LOGO:
fc_logo_fill(lport, fp);
*did = FC_FID_FLOGI;
/*
* if rport is valid then it
* is port logo, therefore
* set did to rport id.
*/
if (rport)
*did = rport->port_id;
break;
case ELS_RTV:
fc_rtv_fill(lport, fp);
*did = rport->port_id;
break;
case ELS_REC:
fc_rec_fill(lport, fp);
*did = rport->port_id;
break;
case ELS_PRLI:
fc_prli_fill(lport, fp);
*did = rport->port_id;
break;
case ELS_SCR:
fc_scr_fill(lport, fp);
*did = FC_FID_FCTRL;
break;
default:
FC_DBG("Invalid op code %x \n", op);
return -EINVAL;
}
*r_ctl = FC_RCTL_ELS_REQ;
*fh_type = FC_TYPE_ELS;
return 0;
}
#endif /* _FC_ENCODE_H_ */

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include/scsi/fc_frame.h Normal file
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/*
* Copyright(c) 2007 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* Maintained at www.Open-FCoE.org
*/
#ifndef _FC_FRAME_H_
#define _FC_FRAME_H_
#include <linux/scatterlist.h>
#include <linux/skbuff.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/fc/fc_fs.h>
#include <scsi/fc/fc_fcp.h>
#include <scsi/fc/fc_encaps.h>
/*
* The fc_frame interface is used to pass frame data between functions.
* The frame includes the data buffer, length, and SOF / EOF delimiter types.
* A pointer to the port structure of the receiving port is also includeded.
*/
#define FC_FRAME_HEADROOM 32 /* headroom for VLAN + FCoE headers */
#define FC_FRAME_TAILROOM 8 /* trailer space for FCoE */
/*
* Information about an individual fibre channel frame received or to be sent.
* The buffer may be in up to 4 additional non-contiguous sections,
* but the linear section must hold the frame header.
*/
#define FC_FRAME_SG_LEN 4 /* scatter/gather list maximum length */
#define fp_skb(fp) (&((fp)->skb))
#define fr_hdr(fp) ((fp)->skb.data)
#define fr_len(fp) ((fp)->skb.len)
#define fr_cb(fp) ((struct fcoe_rcv_info *)&((fp)->skb.cb[0]))
#define fr_dev(fp) (fr_cb(fp)->fr_dev)
#define fr_seq(fp) (fr_cb(fp)->fr_seq)
#define fr_sof(fp) (fr_cb(fp)->fr_sof)
#define fr_eof(fp) (fr_cb(fp)->fr_eof)
#define fr_flags(fp) (fr_cb(fp)->fr_flags)
#define fr_max_payload(fp) (fr_cb(fp)->fr_max_payload)
#define fr_cmd(fp) (fr_cb(fp)->fr_cmd)
#define fr_dir(fp) (fr_cmd(fp)->sc_data_direction)
#define fr_crc(fp) (fr_cb(fp)->fr_crc)
struct fc_frame {
struct sk_buff skb;
};
struct fcoe_rcv_info {
struct packet_type *ptype;
struct fc_lport *fr_dev; /* transport layer private pointer */
struct fc_seq *fr_seq; /* for use with exchange manager */
struct scsi_cmnd *fr_cmd; /* for use of scsi command */
u32 fr_crc;
u16 fr_max_payload; /* max FC payload */
enum fc_sof fr_sof; /* start of frame delimiter */
enum fc_eof fr_eof; /* end of frame delimiter */
u8 fr_flags; /* flags - see below */
};
/*
* Get fc_frame pointer for an skb that's already been imported.
*/
static inline struct fcoe_rcv_info *fcoe_dev_from_skb(const struct sk_buff *skb)
{
BUILD_BUG_ON(sizeof(struct fcoe_rcv_info) > sizeof(skb->cb));
return (struct fcoe_rcv_info *) skb->cb;
}
/*
* fr_flags.
*/
#define FCPHF_CRC_UNCHECKED 0x01 /* CRC not computed, still appended */
/*
* Initialize a frame.
* We don't do a complete memset here for performance reasons.
* The caller must set fr_free, fr_hdr, fr_len, fr_sof, and fr_eof eventually.
*/
static inline void fc_frame_init(struct fc_frame *fp)
{
fr_dev(fp) = NULL;
fr_seq(fp) = NULL;
fr_flags(fp) = 0;
}
struct fc_frame *fc_frame_alloc_fill(struct fc_lport *, size_t payload_len);
struct fc_frame *__fc_frame_alloc(size_t payload_len);
/*
* Get frame for sending via port.
*/
static inline struct fc_frame *_fc_frame_alloc(struct fc_lport *dev,
size_t payload_len)
{
return __fc_frame_alloc(payload_len);
}
/*
* Allocate fc_frame structure and buffer. Set the initial length to
* payload_size + sizeof (struct fc_frame_header).
*/
static inline struct fc_frame *fc_frame_alloc(struct fc_lport *dev, size_t len)
{
struct fc_frame *fp;
/*
* Note: Since len will often be a constant multiple of 4,
* this check will usually be evaluated and eliminated at compile time.
*/
if ((len % 4) != 0)
fp = fc_frame_alloc_fill(dev, len);
else
fp = _fc_frame_alloc(dev, len);
return fp;
}
/*
* Free the fc_frame structure and buffer.
*/
static inline void fc_frame_free(struct fc_frame *fp)
{
kfree_skb(fp_skb(fp));
}
static inline int fc_frame_is_linear(struct fc_frame *fp)
{
return !skb_is_nonlinear(fp_skb(fp));
}
/*
* Get frame header from message in fc_frame structure.
* This hides a cast and provides a place to add some checking.
*/
static inline
struct fc_frame_header *fc_frame_header_get(const struct fc_frame *fp)
{
WARN_ON(fr_len(fp) < sizeof(struct fc_frame_header));
return (struct fc_frame_header *) fr_hdr(fp);
}
/*
* Get frame payload from message in fc_frame structure.
* This hides a cast and provides a place to add some checking.
* The len parameter is the minimum length for the payload portion.
* Returns NULL if the frame is too short.
*
* This assumes the interesting part of the payload is in the first part
* of the buffer for received data. This may not be appropriate to use for
* buffers being transmitted.
*/
static inline void *fc_frame_payload_get(const struct fc_frame *fp,
size_t len)
{
void *pp = NULL;
if (fr_len(fp) >= sizeof(struct fc_frame_header) + len)
pp = fc_frame_header_get(fp) + 1;
return pp;
}
/*
* Get frame payload opcode (first byte) from message in fc_frame structure.
* This hides a cast and provides a place to add some checking. Return 0
* if the frame has no payload.
*/
static inline u8 fc_frame_payload_op(const struct fc_frame *fp)
{
u8 *cp;
cp = fc_frame_payload_get(fp, sizeof(u8));
if (!cp)
return 0;
return *cp;
}
/*
* Get FC class from frame.
*/
static inline enum fc_class fc_frame_class(const struct fc_frame *fp)
{
return fc_sof_class(fr_sof(fp));
}
/*
* Check the CRC in a frame.
* The CRC immediately follows the last data item *AFTER* the length.
* The return value is zero if the CRC matches.
*/
u32 fc_frame_crc_check(struct fc_frame *);
static inline u8 fc_frame_rctl(const struct fc_frame *fp)
{
return fc_frame_header_get(fp)->fh_r_ctl;
}
static inline bool fc_frame_is_cmd(const struct fc_frame *fp)
{
return fc_frame_rctl(fp) == FC_RCTL_DD_UNSOL_CMD;
}
static inline bool fc_frame_is_read(const struct fc_frame *fp)
{
if (fc_frame_is_cmd(fp) && fr_cmd(fp))
return fr_dir(fp) == DMA_FROM_DEVICE;
return false;
}
static inline bool fc_frame_is_write(const struct fc_frame *fp)
{
if (fc_frame_is_cmd(fp) && fr_cmd(fp))
return fr_dir(fp) == DMA_TO_DEVICE;
return false;
}
/*
* Check for leaks.
* Print the frame header of any currently allocated frame, assuming there
* should be none at this point.
*/
void fc_frame_leak_check(void);
#endif /* _FC_FRAME_H_ */

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include/scsi/libfc.h Normal file
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/*
* Copyright(c) 2007 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* Maintained at www.Open-FCoE.org
*/
#ifndef _LIBFC_H_
#define _LIBFC_H_
#include <linux/timer.h>
#include <linux/if.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
#include <scsi/fc/fc_fcp.h>
#include <scsi/fc/fc_ns.h>
#include <scsi/fc/fc_els.h>
#include <scsi/fc/fc_gs.h>
#include <scsi/fc_frame.h>
#define LIBFC_DEBUG
#ifdef LIBFC_DEBUG
/* Log messages */
#define FC_DBG(fmt, args...) \
do { \
printk(KERN_INFO "%s " fmt, __func__, ##args); \
} while (0)
#else
#define FC_DBG(fmt, args...)
#endif
/*
* libfc error codes
*/
#define FC_NO_ERR 0 /* no error */
#define FC_EX_TIMEOUT 1 /* Exchange timeout */
#define FC_EX_CLOSED 2 /* Exchange closed */
/* some helpful macros */
#define ntohll(x) be64_to_cpu(x)
#define htonll(x) cpu_to_be64(x)
#define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
#define hton24(p, v) do { \
p[0] = (((v) >> 16) & 0xFF); \
p[1] = (((v) >> 8) & 0xFF); \
p[2] = ((v) & 0xFF); \
} while (0)
/*
* FC HBA status
*/
#define FC_PAUSE (1 << 1)
#define FC_LINK_UP (1 << 0)
enum fc_lport_state {
LPORT_ST_NONE = 0,
LPORT_ST_FLOGI,
LPORT_ST_DNS,
LPORT_ST_RPN_ID,
LPORT_ST_RFT_ID,
LPORT_ST_SCR,
LPORT_ST_READY,
LPORT_ST_LOGO,
LPORT_ST_RESET
};
enum fc_disc_event {
DISC_EV_NONE = 0,
DISC_EV_SUCCESS,
DISC_EV_FAILED
};
enum fc_rport_state {
RPORT_ST_NONE = 0,
RPORT_ST_INIT, /* initialized */
RPORT_ST_PLOGI, /* waiting for PLOGI completion */
RPORT_ST_PRLI, /* waiting for PRLI completion */
RPORT_ST_RTV, /* waiting for RTV completion */
RPORT_ST_READY, /* ready for use */
RPORT_ST_LOGO, /* port logout sent */
};
enum fc_rport_trans_state {
FC_PORTSTATE_ROGUE,
FC_PORTSTATE_REAL,
};
/**
* struct fc_disc_port - temporary discovery port to hold rport identifiers
* @lp: Fibre Channel host port instance
* @peers: node for list management during discovery and RSCN processing
* @ids: identifiers structure to pass to fc_remote_port_add()
* @rport_work: work struct for starting the rport state machine
*/
struct fc_disc_port {
struct fc_lport *lp;
struct list_head peers;
struct fc_rport_identifiers ids;
struct work_struct rport_work;
};
enum fc_rport_event {
RPORT_EV_NONE = 0,
RPORT_EV_CREATED,
RPORT_EV_FAILED,
RPORT_EV_STOP,
RPORT_EV_LOGO
};
struct fc_rport_operations {
void (*event_callback)(struct fc_lport *, struct fc_rport *,
enum fc_rport_event);
};
/**
* struct fc_rport_libfc_priv - libfc internal information about a remote port
* @local_port: Fibre Channel host port instance
* @rp_state: state tracks progress of PLOGI, PRLI, and RTV exchanges
* @flags: REC and RETRY supported flags
* @max_seq: maximum number of concurrent sequences
* @retries: retry count in current state
* @e_d_tov: error detect timeout value (in msec)
* @r_a_tov: resource allocation timeout value (in msec)
* @rp_mutex: mutex protects rport
* @retry_work:
* @event_callback: Callback for rport READY, FAILED or LOGO
*/
struct fc_rport_libfc_priv {
struct fc_lport *local_port;
enum fc_rport_state rp_state;
u16 flags;
#define FC_RP_FLAGS_REC_SUPPORTED (1 << 0)
#define FC_RP_FLAGS_RETRY (1 << 1)
u16 max_seq;
unsigned int retries;
unsigned int e_d_tov;
unsigned int r_a_tov;
enum fc_rport_trans_state trans_state;
struct mutex rp_mutex;
struct delayed_work retry_work;
enum fc_rport_event event;
struct fc_rport_operations *ops;
struct list_head peers;
struct work_struct event_work;
};
#define PRIV_TO_RPORT(x) \
(struct fc_rport *)((void *)x - sizeof(struct fc_rport));
#define RPORT_TO_PRIV(x) \
(struct fc_rport_libfc_priv *)((void *)x + sizeof(struct fc_rport));
struct fc_rport *fc_rport_rogue_create(struct fc_disc_port *);
static inline void fc_rport_set_name(struct fc_rport *rport, u64 wwpn, u64 wwnn)
{
rport->node_name = wwnn;
rport->port_name = wwpn;
}
/*
* fcoe stats structure
*/
struct fcoe_dev_stats {
u64 SecondsSinceLastReset;
u64 TxFrames;
u64 TxWords;
u64 RxFrames;
u64 RxWords;
u64 ErrorFrames;
u64 DumpedFrames;
u64 LinkFailureCount;
u64 LossOfSignalCount;
u64 InvalidTxWordCount;
u64 InvalidCRCCount;
u64 InputRequests;
u64 OutputRequests;
u64 ControlRequests;
u64 InputMegabytes;
u64 OutputMegabytes;
};
/*
* els data is used for passing ELS respone specific
* data to send ELS response mainly using infomation
* in exchange and sequence in EM layer.
*/
struct fc_seq_els_data {
struct fc_frame *fp;
enum fc_els_rjt_reason reason;
enum fc_els_rjt_explan explan;
};
/*
* FCP request structure, one for each scsi cmd request
*/
struct fc_fcp_pkt {
/*
* housekeeping stuff
*/
struct fc_lport *lp; /* handle to hba struct */
u16 state; /* scsi_pkt state state */
u16 tgt_flags; /* target flags */
atomic_t ref_cnt; /* fcp pkt ref count */
spinlock_t scsi_pkt_lock; /* Must be taken before the host lock
* if both are held at the same time */
/*
* SCSI I/O related stuff
*/
struct scsi_cmnd *cmd; /* scsi command pointer. set/clear
* under host lock */
struct list_head list; /* tracks queued commands. access under
* host lock */
/*
* timeout related stuff
*/
struct timer_list timer; /* command timer */
struct completion tm_done;
int wait_for_comp;
unsigned long start_time; /* start jiffie */
unsigned long end_time; /* end jiffie */
unsigned long last_pkt_time; /* jiffies of last frame received */
/*
* scsi cmd and data transfer information
*/
u32 data_len;
/*
* transport related veriables
*/
struct fcp_cmnd cdb_cmd;
size_t xfer_len;
u32 xfer_contig_end; /* offset of end of contiguous xfer */
u16 max_payload; /* max payload size in bytes */
/*
* scsi/fcp return status
*/
u32 io_status; /* SCSI result upper 24 bits */
u8 cdb_status;
u8 status_code; /* FCP I/O status */
/* bit 3 Underrun bit 2: overrun */
u8 scsi_comp_flags;
u32 req_flags; /* bit 0: read bit:1 write */
u32 scsi_resid; /* residule length */
struct fc_rport *rport; /* remote port pointer */
struct fc_seq *seq_ptr; /* current sequence pointer */
/*
* Error Processing
*/
u8 recov_retry; /* count of recovery retries */
struct fc_seq *recov_seq; /* sequence for REC or SRR */
};
/*
* Structure and function definitions for managing Fibre Channel Exchanges
* and Sequences
*
* fc_exch holds state for one exchange and links to its active sequence.
*
* fc_seq holds the state for an individual sequence.
*/
struct fc_exch_mgr;
/*
* Sequence.
*/
struct fc_seq {
u8 id; /* seq ID */
u16 ssb_stat; /* status flags for sequence status block */
u16 cnt; /* frames sent so far on sequence */
u32 rec_data; /* FC-4 value for REC */
};
#define FC_EX_DONE (1 << 0) /* ep is completed */
#define FC_EX_RST_CLEANUP (1 << 1) /* reset is forcing completion */
/*
* Exchange.
*
* Locking notes: The ex_lock protects following items:
* state, esb_stat, f_ctl, seq.ssb_stat
* seq_id
* sequence allocation
*/
struct fc_exch {
struct fc_exch_mgr *em; /* exchange manager */
u32 state; /* internal driver state */
u16 xid; /* our exchange ID */
struct list_head ex_list; /* free or busy list linkage */
spinlock_t ex_lock; /* lock covering exchange state */
atomic_t ex_refcnt; /* reference counter */
struct delayed_work timeout_work; /* timer for upper level protocols */
struct fc_lport *lp; /* fc device instance */
u16 oxid; /* originator's exchange ID */
u16 rxid; /* responder's exchange ID */
u32 oid; /* originator's FCID */
u32 sid; /* source FCID */
u32 did; /* destination FCID */
u32 esb_stat; /* exchange status for ESB */
u32 r_a_tov; /* r_a_tov from rport (msec) */
u8 seq_id; /* next sequence ID to use */
u32 f_ctl; /* F_CTL flags for sequences */
u8 fh_type; /* frame type */
enum fc_class class; /* class of service */
struct fc_seq seq; /* single sequence */
/*
* Handler for responses to this current exchange.
*/
void (*resp)(struct fc_seq *, struct fc_frame *, void *);
void (*destructor)(struct fc_seq *, void *);
/*
* arg is passed as void pointer to exchange
* resp and destructor handlers
*/
void *arg;
};
#define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
struct libfc_function_template {
/**
* Mandatory Fields
*
* These handlers must be implemented by the LLD.
*/
/*
* Interface to send a FC frame
*/
int (*frame_send)(struct fc_lport *lp, struct fc_frame *fp);
/**
* Optional Fields
*
* The LLD may choose to implement any of the following handlers.
* If LLD doesn't specify hander and leaves its pointer NULL then
* the default libfc function will be used for that handler.
*/
/**
* ELS/CT interfaces
*/
/*
* elsct_send - sends ELS/CT frame
*/
struct fc_seq *(*elsct_send)(struct fc_lport *lport,
struct fc_rport *rport,
struct fc_frame *fp,
unsigned int op,
void (*resp)(struct fc_seq *,
struct fc_frame *fp,
void *arg),
void *arg, u32 timer_msec);
/**
* Exhance Manager interfaces
*/
/*
* Send the FC frame payload using a new exchange and sequence.
*
* The frame pointer with some of the header's fields must be
* filled before calling exch_seq_send(), those fields are,
*
* - routing control
* - FC port did
* - FC port sid
* - FC header type
* - frame control
* - parameter or relative offset
*
* The exchange response handler is set in this routine to resp()
* function pointer. It can be called in two scenarios: if a timeout
* occurs or if a response frame is received for the exchange. The
* fc_frame pointer in response handler will also indicate timeout
* as error using IS_ERR related macros.
*
* The exchange destructor handler is also set in this routine.
* The destructor handler is invoked by EM layer when exchange
* is about to free, this can be used by caller to free its
* resources along with exchange free.
*
* The arg is passed back to resp and destructor handler.
*
* The timeout value (in msec) for an exchange is set if non zero
* timer_msec argument is specified. The timer is canceled when
* it fires or when the exchange is done. The exchange timeout handler
* is registered by EM layer.
*/
struct fc_seq *(*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, unsigned int timer_msec);
/*
* send a frame using existing sequence and exchange.
*/
int (*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.
*/
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.
*/
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.
*/
void (*exch_done)(struct fc_seq *sp);
/*
* Assigns a EM and a free XID for an new exchange and then
* allocates a new exchange and sequence pair.
* The fp can be used to determine free XID.
*/
struct fc_exch *(*exch_get)(struct fc_lport *lp, struct fc_frame *fp);
/*
* Release previously assigned XID by exch_get API.
* The LLD may implement this if XID is assigned by LLD
* in exch_get().
*/
void (*exch_put)(struct fc_lport *lp, struct fc_exch_mgr *mp,
u16 ex_id);
/*
* Start a new sequence on the same exchange/sequence tuple.
*/
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.
*/
void (*exch_mgr_reset)(struct fc_exch_mgr *,
u32 s_id, u32 d_id);
void (*rport_flush_queue)(void);
/**
* Local Port interfaces
*/
/*
* Receive a frame to a local port.
*/
void (*lport_recv)(struct fc_lport *lp, struct fc_seq *sp,
struct fc_frame *fp);
int (*lport_reset)(struct fc_lport *);
/**
* Remote Port interfaces
*/
/*
* 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
*/
int (*rport_login)(struct fc_rport *rport);
/*
* Logoff, and remove the rport from the transport if
* it had been added. This will send a LOGO to the target.
*/
int (*rport_logoff)(struct fc_rport *rport);
/*
* Recieve a request from a remote port.
*/
void (*rport_recv_req)(struct fc_seq *, struct fc_frame *,
struct fc_rport *);
struct fc_rport *(*rport_lookup)(const struct fc_lport *, u32);
/**
* FCP interfaces
*/
/*
* 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.
*
*/
int (*fcp_cmd_send)(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
void (*resp)(struct fc_seq *, struct fc_frame *fp,
void *arg));
/*
* Used at least durring linkdown and reset
*/
void (*fcp_cleanup)(struct fc_lport *lp);
/*
* Abort all I/O on a local port
*/
void (*fcp_abort_io)(struct fc_lport *lp);
/**
* Discovery interfaces
*/
void (*disc_recv_req)(struct fc_seq *,
struct fc_frame *, struct fc_lport *);
/*
* Start discovery for a local port.
*/
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
*/
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
*/
void (*disc_stop_final) (struct fc_lport *);
};
/* information used by the discovery layer */
struct fc_disc {
unsigned char retry_count;
unsigned char delay;
unsigned char pending;
unsigned char requested;
unsigned short seq_count;
unsigned char buf_len;
enum fc_disc_event event;
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 fc_exch_mgr *emp;
struct fc_rport *dns_rp;
struct fc_rport *ptp_rp;
void *scsi_priv;
struct fc_disc disc;
/* Operational Information */
struct libfc_function_template tt;
u16 link_status;
enum fc_lport_state state;
unsigned long boot_time;
struct fc_host_statistics host_stats;
struct fcoe_dev_stats *dev_stats[NR_CPUS];
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;
u16 link_speed;
u16 link_supported_speeds;
u16 lro_xid; /* max xid for fcoe lro */
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 void *lport_priv(const struct fc_lport *lp)
{
return (void *)(lp + 1);
}
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;
}
/**
* 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 *);
/*
* Pause and unpause traffic.
*/
void fc_pause(struct fc_lport *);
void fc_unpause(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 *);
/**
* 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);
/*
* 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.
* The LLD can use exch_get() of struct libfc_function_template
* to specify XID for a new exchange within
* a specified EM instance.
*
* The em_idx to uniquely identify an EM instance.
*/
struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp,
enum fc_class class,
u16 min_xid,
u16 max_xid);
/*
* Free an exchange manager.
*/
void fc_exch_mgr_free(struct fc_exch_mgr *mp);
/*
* Receive a frame on specified local port and exchange manager.
*/
void fc_exch_recv(struct fc_lport *lp, struct fc_exch_mgr *mp,
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.
*/
void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd,
struct fc_seq_els_data *els_data);
/*
* 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.
*/
int fc_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.
*/
void fc_exch_done(struct fc_seq *sp);
/*
* Assigns a EM and XID for a frame and then allocates
* a new exchange and sequence pair.
* The fp can be used to determine free XID.
*/
struct fc_exch *fc_exch_get(struct fc_lport *lp, struct fc_frame *fp);
/*
* Allocate a new exchange and sequence pair.
* if ex_id is zero then next free exchange id
* from specified exchange manger mp will be assigned.
*/
struct fc_exch *fc_exch_alloc(struct fc_exch_mgr *mp,
struct fc_frame *fp, u16 ex_id);
/*
* Start a new sequence on the same exchange as the supplied sequence.
*/
struct fc_seq *fc_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.
*/
void fc_exch_mgr_reset(struct fc_exch_mgr *, 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);
#endif /* _LIBFC_H_ */