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[SCSI] libiscsi: merge iscsi_mgmt_task and iscsi_cmd_task

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There is no need to have the mgmt and cmd tasks separate
structs. It used to save a lot of memory when we overprealocated
memory for tasks, but the next patches will set up the
driver so in the future they can use a mempool or some other
common scsi command allocator and common tagging.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Mike Christie 2008-05-21 15:54:06 -05:00 committed by James Bottomley
parent 052d014485
commit 3e5c28ad03
3 changed files with 272 additions and 316 deletions
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518
drivers/scsi/libiscsi.c
View File

@ -197,7 +197,7 @@ static int iscsi_prep_bidi_ahs(struct iscsi_cmd_task *ctask)
/**
* iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
* @ctask: iscsi cmd task
* @ctask: iscsi task
*
* Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
* fields like dlength or final based on how much data it sends
@ -300,31 +300,31 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
WARN_ON(hdrlength >= 256);
hdr->hlength = hdrlength & 0xFF;
if (conn->session->tt->init_cmd_task &&
conn->session->tt->init_cmd_task(ctask))
if (conn->session->tt->init_task &&
conn->session->tt->init_task(ctask))
return -EIO;
ctask->state = ISCSI_TASK_RUNNING;
list_move_tail(&ctask->running, &conn->run_list);
conn->scsicmd_pdus_cnt++;
debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x "
"len %d bidi_len %d cmdsn %d win %d]\n",
scsi_bidi_cmnd(sc) ? "bidirectional" :
sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
conn->id, sc, sc->cmnd[0], ctask->itt,
scsi_bufflen(sc), scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
"bidi_len %d cmdsn %d win %d]\n", scsi_bidi_cmnd(sc) ?
"bidirectional" : sc->sc_data_direction == DMA_TO_DEVICE ?
"write" : "read", conn->id, sc, sc->cmnd[0], ctask->itt,
scsi_bufflen(sc),
scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
return 0;
}
/**
* iscsi_complete_command - return command back to scsi-ml
* iscsi_complete_command - finish a task
* @ctask: iscsi cmd task
*
* Must be called with session lock.
* This function returns the scsi command to scsi-ml and returns
* the cmd task to the pool of available cmd tasks.
* This function returns the scsi command to scsi-ml or cleans
* up mgmt tasks then returns the task to the pool.
*/
static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
{
@ -332,17 +332,34 @@ static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
struct iscsi_session *session = conn->session;
struct scsi_cmnd *sc = ctask->sc;
list_del_init(&ctask->running);
ctask->state = ISCSI_TASK_COMPLETED;
ctask->sc = NULL;
/* SCSI eh reuses commands to verify us */
sc->SCp.ptr = NULL;
if (conn->ctask == ctask)
conn->ctask = NULL;
list_del_init(&ctask->running);
/*
* login ctask is preallocated so do not free
*/
if (conn->login_ctask == ctask)
return;
__kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
if (sc->scsi_done)
sc->scsi_done(sc);
if (conn->ping_ctask == ctask)
conn->ping_ctask = NULL;
if (sc) {
ctask->sc = NULL;
/* SCSI eh reuses commands to verify us */
sc->SCp.ptr = NULL;
/*
* queue command may call this to free the task, but
* not have setup the sc callback
*/
if (sc->scsi_done)
sc->scsi_done(sc);
}
}
static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
@ -356,6 +373,16 @@ static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
iscsi_complete_command(ctask);
}
void iscsi_put_ctask(struct iscsi_cmd_task *ctask)
{
struct iscsi_session *session = ctask->conn->session;
spin_lock_bh(&session->lock);
__iscsi_put_ctask(ctask);
spin_unlock_bh(&session->lock);
}
EXPORT_SYMBOL_GPL(iscsi_put_ctask);
/*
* session lock must be held
*/
@ -375,47 +402,28 @@ static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
*/
conn->session->queued_cmdsn--;
else
conn->session->tt->cleanup_cmd_task(conn, ctask);
conn->session->tt->cleanup_task(conn, ctask);
sc->result = err;
if (!scsi_bidi_cmnd(sc))
scsi_set_resid(sc, scsi_bufflen(sc));
else {
scsi_out(sc)->resid = scsi_out(sc)->length;
scsi_in(sc)->resid = scsi_in(sc)->length;
}
if (conn->ctask == ctask)
conn->ctask = NULL;
/* release ref from queuecommand */
__iscsi_put_ctask(ctask);
}
/**
* iscsi_free_mgmt_task - return mgmt task back to pool
* @conn: iscsi connection
* @mtask: mtask
*
* Must be called with session lock.
*/
void iscsi_free_mgmt_task(struct iscsi_conn *conn,
struct iscsi_mgmt_task *mtask)
{
list_del_init(&mtask->running);
if (conn->login_mtask == mtask)
return;
if (conn->ping_mtask == mtask)
conn->ping_mtask = NULL;
__kfifo_put(conn->session->mgmtpool.queue,
(void*)&mtask, sizeof(void*));
}
EXPORT_SYMBOL_GPL(iscsi_free_mgmt_task);
static int iscsi_prep_mtask(struct iscsi_conn *conn,
struct iscsi_mgmt_task *mtask)
static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
struct iscsi_cmd_task *ctask)
{
struct iscsi_session *session = conn->session;
struct iscsi_hdr *hdr = mtask->hdr;
struct iscsi_hdr *hdr = (struct iscsi_hdr *)ctask->hdr;
struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
@ -429,7 +437,7 @@ static int iscsi_prep_mtask(struct iscsi_conn *conn,
*/
nop->cmdsn = cpu_to_be32(session->cmdsn);
if (hdr->itt != RESERVED_ITT) {
hdr->itt = build_itt(mtask->itt, session->age);
hdr->itt = build_itt(ctask->itt, session->age);
/*
* TODO: We always use immediate, so we never hit this.
* If we start to send tmfs or nops as non-immediate then
@ -442,25 +450,25 @@ static int iscsi_prep_mtask(struct iscsi_conn *conn,
}
}
if (session->tt->init_mgmt_task)
session->tt->init_mgmt_task(conn, mtask);
if (session->tt->init_task)
session->tt->init_task(ctask);
if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
session->state = ISCSI_STATE_LOGGING_OUT;
list_move_tail(&mtask->running, &conn->mgmt_run_list);
list_move_tail(&ctask->running, &conn->mgmt_run_list);
debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt,
mtask->data_count);
ctask->data_count);
return 0;
}
static struct iscsi_mgmt_task *
static struct iscsi_cmd_task *
__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
char *data, uint32_t data_size)
{
struct iscsi_session *session = conn->session;
struct iscsi_mgmt_task *mtask;
struct iscsi_cmd_task *ctask;
if (session->state == ISCSI_STATE_TERMINATE)
return NULL;
@ -470,48 +478,56 @@ __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
/*
* Login and Text are sent serially, in
* request-followed-by-response sequence.
* Same mtask can be used. Same ITT must be used.
* Note that login_mtask is preallocated at conn_create().
* Same task can be used. Same ITT must be used.
* Note that login_task is preallocated at conn_create().
*/
mtask = conn->login_mtask;
ctask = conn->login_ctask;
else {
BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
if (!__kfifo_get(session->mgmtpool.queue,
(void*)&mtask, sizeof(void*)))
if (!__kfifo_get(session->cmdpool.queue,
(void*)&ctask, sizeof(void*)))
return NULL;
if ((hdr->opcode == (ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE)) &&
hdr->ttt == RESERVED_ITT) {
conn->ping_mtask = mtask;
conn->ping_ctask = ctask;
conn->last_ping = jiffies;
}
}
/*
* released in complete pdu for task we expect a response for, and
* released by the lld when it has transmitted the task for
* pdus we do not expect a response for.
*/
atomic_set(&ctask->refcount, 1);
ctask->conn = conn;
ctask->sc = NULL;
if (data_size) {
memcpy(mtask->data, data, data_size);
mtask->data_count = data_size;
memcpy(ctask->data, data, data_size);
ctask->data_count = data_size;
} else
mtask->data_count = 0;
ctask->data_count = 0;
memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
INIT_LIST_HEAD(&mtask->running);
list_add_tail(&mtask->running, &conn->mgmtqueue);
memcpy(ctask->hdr, hdr, sizeof(struct iscsi_hdr));
INIT_LIST_HEAD(&ctask->running);
list_add_tail(&ctask->running, &conn->mgmtqueue);
if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) {
if (iscsi_prep_mtask(conn, mtask)) {
iscsi_free_mgmt_task(conn, mtask);
if (iscsi_prep_mgmt_task(conn, ctask)) {
__iscsi_put_ctask(ctask);
return NULL;
}
if (session->tt->xmit_mgmt_task(conn, mtask))
mtask = NULL;
if (session->tt->xmit_task(ctask))
ctask = NULL;
} else
scsi_queue_work(conn->session->host, &conn->xmitwork);
return mtask;
return ctask;
}
int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
@ -538,7 +554,7 @@ EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
* @datalen: len of buffer
*
* iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
* then completes the command and task.
* then completes the command and ctask.
**/
static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
struct iscsi_cmd_task *ctask, char *data,
@ -634,9 +650,9 @@ static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
{
struct iscsi_nopout hdr;
struct iscsi_mgmt_task *mtask;
struct iscsi_cmd_task *ctask;
if (!rhdr && conn->ping_mtask)
if (!rhdr && conn->ping_ctask)
return;
memset(&hdr, 0, sizeof(struct iscsi_nopout));
@ -650,8 +666,8 @@ static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
} else
hdr.ttt = RESERVED_ITT;
mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
if (!mtask)
ctask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
if (!ctask)
iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
}
@ -697,7 +713,6 @@ static int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
struct iscsi_session *session = conn->session;
int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
struct iscsi_cmd_task *ctask;
struct iscsi_mgmt_task *mtask;
uint32_t itt;
conn->last_recv = jiffies;
@ -710,93 +725,10 @@ static int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
else
itt = ~0U;
if (itt < session->cmds_max) {
ctask = session->cmds[itt];
debug_scsi("[op 0x%x cid %d itt 0x%x len %d]\n",
opcode, conn->id, itt, datalen);
debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
opcode, conn->id, ctask->itt, datalen);
switch(opcode) {
case ISCSI_OP_SCSI_CMD_RSP:
BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
datalen);
break;
case ISCSI_OP_SCSI_DATA_IN:
BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
conn->scsirsp_pdus_cnt++;
__iscsi_put_ctask(ctask);
}
break;
case ISCSI_OP_R2T:
/* LLD handles this for now */
break;
default:
rc = ISCSI_ERR_BAD_OPCODE;
break;
}
} else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
opcode, conn->id, mtask->itt, datalen);
iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
switch(opcode) {
case ISCSI_OP_LOGOUT_RSP:
if (datalen) {
rc = ISCSI_ERR_PROTO;
break;
}
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
/* fall through */
case ISCSI_OP_LOGIN_RSP:
case ISCSI_OP_TEXT_RSP:
/*
* login related PDU's exp_statsn is handled in
* userspace
*/
if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
rc = ISCSI_ERR_CONN_FAILED;
iscsi_free_mgmt_task(conn, mtask);
break;
case ISCSI_OP_SCSI_TMFUNC_RSP:
if (datalen) {
rc = ISCSI_ERR_PROTO;
break;
}
iscsi_tmf_rsp(conn, hdr);
iscsi_free_mgmt_task(conn, mtask);
break;
case ISCSI_OP_NOOP_IN:
if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) ||
datalen) {
rc = ISCSI_ERR_PROTO;
break;
}
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
if (conn->ping_mtask != mtask) {
/*
* If this is not in response to one of our
* nops then it must be from userspace.
*/
if (iscsi_recv_pdu(conn->cls_conn, hdr, data,
datalen))
rc = ISCSI_ERR_CONN_FAILED;
} else
mod_timer(&conn->transport_timer,
jiffies + conn->recv_timeout);
iscsi_free_mgmt_task(conn, mtask);
break;
default:
rc = ISCSI_ERR_BAD_OPCODE;
break;
}
} else if (itt == ~0U) {
if (itt == ~0U) {
iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
switch(opcode) {
@ -823,9 +755,88 @@ static int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
rc = ISCSI_ERR_BAD_OPCODE;
break;
}
} else
rc = ISCSI_ERR_BAD_ITT;
goto out;
}
ctask = session->cmds[itt];
switch(opcode) {
case ISCSI_OP_SCSI_CMD_RSP:
if (!ctask->sc) {
rc = ISCSI_ERR_NO_SCSI_CMD;
break;
}
BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
iscsi_scsi_cmd_rsp(conn, hdr, ctask, data, datalen);
break;
case ISCSI_OP_SCSI_DATA_IN:
if (!ctask->sc) {
rc = ISCSI_ERR_NO_SCSI_CMD;
break;
}
BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
conn->scsirsp_pdus_cnt++;
iscsi_update_cmdsn(session,
(struct iscsi_nopin*) hdr);
__iscsi_put_ctask(ctask);
}
break;
case ISCSI_OP_R2T:
/* LLD handles this for now */
break;
case ISCSI_OP_LOGOUT_RSP:
iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
if (datalen) {
rc = ISCSI_ERR_PROTO;
break;
}
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
goto recv_pdu;
case ISCSI_OP_LOGIN_RSP:
case ISCSI_OP_TEXT_RSP:
iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
/*
* login related PDU's exp_statsn is handled in
* userspace
*/
goto recv_pdu;
case ISCSI_OP_SCSI_TMFUNC_RSP:
iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
if (datalen) {
rc = ISCSI_ERR_PROTO;
break;
}
iscsi_tmf_rsp(conn, hdr);
__iscsi_put_ctask(ctask);
break;
case ISCSI_OP_NOOP_IN:
iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
rc = ISCSI_ERR_PROTO;
break;
}
conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
if (conn->ping_ctask != ctask)
/*
* If this is not in response to one of our
* nops then it must be from userspace.
*/
goto recv_pdu;
__iscsi_put_ctask(ctask);
break;
default:
rc = ISCSI_ERR_BAD_OPCODE;
break;
}
out:
return rc;
recv_pdu:
if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
rc = ISCSI_ERR_CONN_FAILED;
__iscsi_put_ctask(ctask);
return rc;
}
@ -845,6 +856,7 @@ int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
{
struct iscsi_session *session = conn->session;
struct iscsi_cmd_task *ctask;
uint32_t i;
if (itt == RESERVED_ITT)
return 0;
@ -858,25 +870,22 @@ int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
return ISCSI_ERR_BAD_ITT;
}
if (itt < session->cmds_max) {
ctask = session->cmds[itt];
if (!ctask->sc) {
iscsi_conn_printk(KERN_INFO, conn, "dropping ctask "
"with itt 0x%x\n", ctask->itt);
/* force drop */
return ISCSI_ERR_NO_SCSI_CMD;
}
if (ctask->sc->SCp.phase != session->age) {
iscsi_conn_printk(KERN_ERR, conn,
"iscsi: ctask's session age %d, "
"expected %d\n", ctask->sc->SCp.phase,
session->age);
return ISCSI_ERR_SESSION_FAILED;
}
i = get_itt(itt);
if (i >= session->cmds_max) {
iscsi_conn_printk(KERN_ERR, conn,
"received invalid itt index %u (max cmds "
"%u.\n", i, session->cmds_max);
return ISCSI_ERR_BAD_ITT;
}
ctask = session->cmds[i];
if (ctask->sc && ctask->sc->SCp.phase != session->age) {
iscsi_conn_printk(KERN_ERR, conn,
"iscsi: ctask's session age %d, "
"expected %d\n", ctask->sc->SCp.phase,
session->age);
return ISCSI_ERR_SESSION_FAILED;
}
return 0;
}
EXPORT_SYMBOL_GPL(iscsi_verify_itt);
@ -929,20 +938,6 @@ void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
}
EXPORT_SYMBOL_GPL(iscsi_conn_failure);
static int iscsi_xmit_mtask(struct iscsi_conn *conn)
{
int rc;
spin_unlock_bh(&conn->session->lock);
rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
spin_lock_bh(&conn->session->lock);
if (rc)
return rc;
/* done with this in-progress mtask */
conn->mtask = NULL;
return 0;
}
static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
{
struct iscsi_session *session = conn->session;
@ -967,7 +962,7 @@ static int iscsi_xmit_ctask(struct iscsi_conn *conn)
__iscsi_get_ctask(ctask);
spin_unlock_bh(&conn->session->lock);
rc = conn->session->tt->xmit_cmd_task(conn, ctask);
rc = conn->session->tt->xmit_task(ctask);
spin_lock_bh(&conn->session->lock);
__iscsi_put_ctask(ctask);
if (!rc)
@ -1015,12 +1010,6 @@ static int iscsi_data_xmit(struct iscsi_conn *conn)
if (conn->ctask) {
rc = iscsi_xmit_ctask(conn);
if (rc)
goto again;
}
if (conn->mtask) {
rc = iscsi_xmit_mtask(conn);
if (rc)
goto again;
}
@ -1032,14 +1021,14 @@ static int iscsi_data_xmit(struct iscsi_conn *conn)
*/
check_mgmt:
while (!list_empty(&conn->mgmtqueue)) {
conn->mtask = list_entry(conn->mgmtqueue.next,
struct iscsi_mgmt_task, running);
if (iscsi_prep_mtask(conn, conn->mtask)) {
iscsi_free_mgmt_task(conn, conn->mtask);
conn->mtask = NULL;
conn->ctask = list_entry(conn->mgmtqueue.next,
struct iscsi_cmd_task, running);
if (iscsi_prep_mgmt_task(conn, conn->ctask)) {
__iscsi_put_ctask(conn->ctask);
conn->ctask = NULL;
continue;
}
rc = iscsi_xmit_mtask(conn);
rc = iscsi_xmit_ctask(conn);
if (rc)
goto again;
}
@ -1224,7 +1213,7 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
iscsi_complete_command(ctask);
goto fault;
}
if (session->tt->xmit_cmd_task(conn, ctask)) {
if (session->tt->xmit_task(ctask)) {
sc->scsi_done = NULL;
iscsi_complete_command(ctask);
reason = FAILURE_SESSION_NOT_READY;
@ -1347,16 +1336,16 @@ static void iscsi_tmf_timedout(unsigned long data)
spin_unlock(&session->lock);
}
static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
static int iscsi_exec_ctask_mgmt_fn(struct iscsi_conn *conn,
struct iscsi_tm *hdr, int age,
int timeout)
{
struct iscsi_session *session = conn->session;
struct iscsi_mgmt_task *mtask;
struct iscsi_cmd_task *ctask;
mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
ctask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
NULL, 0);
if (!mtask) {
if (!ctask) {
spin_unlock_bh(&session->lock);
iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
spin_lock_bh(&session->lock);
@ -1390,7 +1379,7 @@ static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
mutex_lock(&session->eh_mutex);
spin_lock_bh(&session->lock);
/* if the session drops it will clean up the mtask */
/* if the session drops it will clean up the ctask */
if (age != session->age ||
session->state != ISCSI_STATE_LOGGED_IN)
return -ENOTCONN;
@ -1497,7 +1486,7 @@ static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
jiffies))
rc = EH_RESET_TIMER;
/* if in the middle of checking the transport then give us more time */
if (conn->ping_mtask)
if (conn->ping_ctask)
rc = EH_RESET_TIMER;
done:
spin_unlock(&session->lock);
@ -1521,7 +1510,7 @@ static void iscsi_check_transport_timeouts(unsigned long data)
recv_timeout *= HZ;
last_recv = conn->last_recv;
if (conn->ping_mtask &&
if (conn->ping_ctask &&
time_before_eq(conn->last_ping + (conn->ping_timeout * HZ),
jiffies)) {
iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
@ -1547,7 +1536,7 @@ static void iscsi_check_transport_timeouts(unsigned long data)
spin_unlock(&session->lock);
}
static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask,
static void iscsi_prep_abort_ctask_pdu(struct iscsi_cmd_task *ctask,
struct iscsi_tm *hdr)
{
memset(hdr, 0, sizeof(*hdr));
@ -1619,9 +1608,9 @@ int iscsi_eh_abort(struct scsi_cmnd *sc)
conn->tmf_state = TMF_QUEUED;
hdr = &conn->tmhdr;
iscsi_prep_abort_task_pdu(ctask, hdr);
iscsi_prep_abort_ctask_pdu(ctask, hdr);
if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
if (iscsi_exec_ctask_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
rc = FAILED;
goto failed;
}
@ -1631,7 +1620,7 @@ int iscsi_eh_abort(struct scsi_cmnd *sc)
spin_unlock_bh(&session->lock);
iscsi_suspend_tx(conn);
/*
* clean up task if aborted. grab the recv lock as a writer
* clean up ctask if aborted. grab the recv lock as a writer
*/
write_lock_bh(conn->recv_lock);
spin_lock(&session->lock);
@ -1716,7 +1705,7 @@ int iscsi_eh_device_reset(struct scsi_cmnd *sc)
hdr = &conn->tmhdr;
iscsi_prep_lun_reset_pdu(sc, hdr);
if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
if (iscsi_exec_ctask_mgmt_fn(conn, hdr, session->age,
session->lu_reset_timeout)) {
rc = FAILED;
goto unlock;
@ -1897,8 +1886,7 @@ EXPORT_SYMBOL_GPL(iscsi_host_free);
* @iscsit: iscsi transport template
* @shost: scsi host
* @cmds_max: session can queue
* @cmd_task_size: LLD ctask private data size
* @mgmt_task_size: LLD mtask private data size
* @cmd_ctask_size: LLD ctask private data size
* @initial_cmdsn: initial CmdSN
*
* This can be used by software iscsi_transports that allocate
@ -1906,22 +1894,26 @@ EXPORT_SYMBOL_GPL(iscsi_host_free);
*/
struct iscsi_cls_session *
iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
uint16_t cmds_max, int cmd_task_size, int mgmt_task_size,
uint16_t scsi_cmds_max, int cmd_ctask_size,
uint32_t initial_cmdsn)
{
struct iscsi_session *session;
struct iscsi_cls_session *cls_session;
int cmd_i;
int cmd_i, cmds_max;
if (!is_power_of_2(cmds_max) || cmds_max >= ISCSI_MGMT_ITT_OFFSET ||
cmds_max < 2) {
if (cmds_max != 0)
printk(KERN_ERR "iscsi: invalid can_queue of %d. "
"can_queue must be a power of 2 and between "
"2 and %d - setting to %d.\n", cmds_max,
ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX);
cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
/*
* The iscsi layer needs some ctasks for nop handling and tmfs.
*/
if (scsi_cmds_max < 1)
scsi_cmds_max = ISCSI_MGMT_CMDS_MAX;
if ((scsi_cmds_max + ISCSI_MGMT_CMDS_MAX) >= ISCSI_MGMT_ITT_OFFSET) {
printk(KERN_ERR "iscsi: invalid can_queue of %d. "
"can_queue must be less than %d.\n",
scsi_cmds_max,
ISCSI_MGMT_ITT_OFFSET - ISCSI_MGMT_CMDS_MAX);
scsi_cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
}
cmds_max = roundup_pow_of_two(scsi_cmds_max + ISCSI_MGMT_CMDS_MAX);
cls_session = iscsi_alloc_session(shost, iscsit,
sizeof(struct iscsi_session));
@ -1934,7 +1926,7 @@ iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
session->fast_abort = 1;
session->lu_reset_timeout = 15;
session->abort_timeout = 10;
session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
session->scsi_cmds_max = scsi_cmds_max;
session->cmds_max = cmds_max;
session->queued_cmdsn = session->cmdsn = initial_cmdsn;
session->exp_cmdsn = initial_cmdsn + 1;
@ -1947,36 +1939,19 @@ iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
/* initialize SCSI PDU commands pool */
if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
(void***)&session->cmds,
cmd_task_size + sizeof(struct iscsi_cmd_task)))
cmd_ctask_size + sizeof(struct iscsi_cmd_task)))
goto cmdpool_alloc_fail;
/* pre-format cmds pool with ITT */
for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
if (cmd_task_size)
if (cmd_ctask_size)
ctask->dd_data = &ctask[1];
ctask->itt = cmd_i;
INIT_LIST_HEAD(&ctask->running);
}
/* initialize immediate command pool */
if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
(void***)&session->mgmt_cmds,
mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
goto mgmtpool_alloc_fail;
/* pre-format immediate cmds pool with ITT */
for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
if (mgmt_task_size)
mtask->dd_data = &mtask[1];
mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
INIT_LIST_HEAD(&mtask->running);
}
if (!try_module_get(iscsit->owner))
goto module_get_fail;
@ -1987,8 +1962,6 @@ iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
cls_session_fail:
module_put(iscsit->owner);
module_get_fail:
iscsi_pool_free(&session->mgmtpool);
mgmtpool_alloc_fail:
iscsi_pool_free(&session->cmdpool);
cmdpool_alloc_fail:
iscsi_free_session(cls_session);
@ -2008,7 +1981,6 @@ void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
struct iscsi_session *session = cls_session->dd_data;
struct module *owner = cls_session->transport->owner;
iscsi_pool_free(&session->mgmtpool);
iscsi_pool_free(&session->cmdpool);
kfree(session->password);
@ -2063,30 +2035,30 @@ iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
INIT_LIST_HEAD(&conn->requeue);
INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
/* allocate login_mtask used for the login/text sequences */
/* allocate login_ctask used for the login/text sequences */
spin_lock_bh(&session->lock);
if (!__kfifo_get(session->mgmtpool.queue,
(void*)&conn->login_mtask,
if (!__kfifo_get(session->cmdpool.queue,
(void*)&conn->login_ctask,
sizeof(void*))) {
spin_unlock_bh(&session->lock);
goto login_mtask_alloc_fail;
goto login_ctask_alloc_fail;
}
spin_unlock_bh(&session->lock);
data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
if (!data)
goto login_mtask_data_alloc_fail;
conn->login_mtask->data = conn->data = data;
goto login_ctask_data_alloc_fail;
conn->login_ctask->data = conn->data = data;
init_timer(&conn->tmf_timer);
init_waitqueue_head(&conn->ehwait);
return cls_conn;
login_mtask_data_alloc_fail:
__kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
login_ctask_data_alloc_fail:
__kfifo_put(session->cmdpool.queue, (void*)&conn->login_ctask,
sizeof(void*));
login_mtask_alloc_fail:
login_ctask_alloc_fail:
iscsi_destroy_conn(cls_conn);
return NULL;
}
@ -2146,7 +2118,7 @@ void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
spin_lock_bh(&session->lock);
kfree(conn->data);
kfree(conn->persistent_address);
__kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
__kfifo_put(session->cmdpool.queue, (void*)&conn->login_ctask,
sizeof(void*));
if (session->leadconn == conn)
session->leadconn = NULL;
@ -2227,21 +2199,23 @@ EXPORT_SYMBOL_GPL(iscsi_conn_start);
static void
flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
{
struct iscsi_mgmt_task *mtask, *tmp;
struct iscsi_cmd_task *ctask, *tmp;
/* handle pending */
list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) {
debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
iscsi_free_mgmt_task(conn, mtask);
list_for_each_entry_safe(ctask, tmp, &conn->mgmtqueue, running) {
debug_scsi("flushing pending mgmt ctask itt 0x%x\n", ctask->itt);
/* release ref from prep ctask */
__iscsi_put_ctask(ctask);
}
/* handle running */
list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
iscsi_free_mgmt_task(conn, mtask);
list_for_each_entry_safe(ctask, tmp, &conn->mgmt_run_list, running) {
debug_scsi("flushing running mgmt ctask itt 0x%x\n", ctask->itt);
/* release ref from prep ctask */
__iscsi_put_ctask(ctask);
}
conn->mtask = NULL;
conn->ctask = NULL;
}
static void iscsi_start_session_recovery(struct iscsi_session *session,
@ -2272,7 +2246,7 @@ static void iscsi_start_session_recovery(struct iscsi_session *session,
/*
* When this is called for the in_login state, we only want to clean
* up the login task and connection. We do not need to block and set
* up the login ctask and connection. We do not need to block and set
* the recovery state again
*/
if (flag == STOP_CONN_TERM)

29
include/scsi/libiscsi.h
View File

@ -85,18 +85,6 @@ enum {
ISCSI_DIGEST_SIZE = sizeof(__u32),
};
struct iscsi_mgmt_task {
/*
* Becuae LLDs allocate their hdr differently, this is a pointer to
* that storage. It must be setup at session creation time.
*/
struct iscsi_hdr *hdr;
char *data; /* mgmt payload */
unsigned data_count; /* counts data to be sent */
uint32_t itt; /* this ITT */
void *dd_data; /* driver/transport data */
struct list_head running;
};
enum {
ISCSI_TASK_COMPLETED,
@ -121,6 +109,7 @@ struct iscsi_cmd_task {
/* offset in unsolicited stream (bytes); */
unsigned unsol_offset;
unsigned data_count; /* remaining Data-Out */
char *data; /* mgmt payload */
struct scsi_cmnd *sc; /* associated SCSI cmd*/
struct iscsi_conn *conn; /* used connection */
@ -162,7 +151,7 @@ struct iscsi_conn {
unsigned long last_ping;
int ping_timeout;
int recv_timeout;
struct iscsi_mgmt_task *ping_mtask;
struct iscsi_cmd_task *ping_ctask;
/* iSCSI connection-wide sequencing */
uint32_t exp_statsn;
@ -178,9 +167,8 @@ struct iscsi_conn {
* should always fit in this buffer
*/
char *data;
struct iscsi_mgmt_task *login_mtask; /* mtask used for login/text */
struct iscsi_mgmt_task *mtask; /* xmit mtask in progress */
struct iscsi_cmd_task *ctask; /* xmit ctask in progress */
struct iscsi_cmd_task *login_ctask; /* mtask used for login/text */
struct iscsi_cmd_task *ctask; /* xmit task in progress */
/* xmit */
struct list_head mgmtqueue; /* mgmt (control) xmit queue */
@ -295,12 +283,10 @@ struct iscsi_session {
int state; /* session state */
int age; /* counts session re-opens */
int scsi_cmds_max; /* max scsi commands */
int cmds_max; /* size of cmds array */
struct iscsi_cmd_task **cmds; /* Original Cmds arr */
struct iscsi_pool cmdpool; /* PDU's pool */
int mgmtpool_max; /* size of mgmt array */
struct iscsi_mgmt_task **mgmt_cmds; /* Original mgmt arr */
struct iscsi_pool mgmtpool; /* Mgmt PDU's pool */
};
struct iscsi_host {
@ -345,7 +331,7 @@ extern void iscsi_host_free(struct Scsi_Host *shost);
*/
extern struct iscsi_cls_session *
iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost,
uint16_t, int, int, uint32_t);
uint16_t, int, uint32_t);
extern void iscsi_session_teardown(struct iscsi_cls_session *);
extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
@ -388,8 +374,7 @@ extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
extern int iscsi_verify_itt(struct iscsi_conn *, itt_t);
extern struct iscsi_cmd_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t);
extern void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask);
extern void iscsi_free_mgmt_task(struct iscsi_conn *conn,
struct iscsi_mgmt_task *mtask);
extern void iscsi_put_ctask(struct iscsi_cmd_task *ctask);
/*
* generic helpers

41
include/scsi/scsi_transport_iscsi.h
View File

@ -34,7 +34,6 @@ struct Scsi_Host;
struct iscsi_cls_conn;
struct iscsi_conn;
struct iscsi_cmd_task;
struct iscsi_mgmt_task;
struct sockaddr;
/**
@ -58,19 +57,22 @@ struct sockaddr;
* @stop_conn: suspend/recover/terminate connection
* @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text.
* @session_recovery_timedout: notify LLD a block during recovery timed out
* @init_cmd_task: Initialize a iscsi_cmd_task and any internal structs.
* Called from queuecommand with session lock held.
* @init_mgmt_task: Initialize a iscsi_mgmt_task and any internal structs.
* Called from iscsi_conn_send_generic with xmitmutex.
* @xmit_cmd_task: Requests LLD to transfer cmd task. Returns 0 or the
* @init_task: Initialize a iscsi_task and any internal structs.
* When offloading the data path, this is called from
* queuecommand with the session lock, or from the
* iscsi_conn_send_pdu context with the session lock.
* When not offloading the data path, this is called
* from the scsi work queue without the session lock.
* @xmit_task Requests LLD to transfer cmd task. Returns 0 or the
* the number of bytes transferred on success, and -Exyz
* value on error.
* @xmit_mgmt_task: Requests LLD to transfer mgmt task. Returns 0 or the
* the number of bytes transferred on success, and -Exyz
* value on error.
* @cleanup_cmd_task: requests LLD to fail cmd task. Called with xmitmutex
* and session->lock after the connection has been
* suspended and terminated during recovery. If called
* value on error. When offloading the data path, this
* is called from queuecommand with the session lock, or
* from the iscsi_conn_send_pdu context with the session
* lock. When not offloading the data path, this is called
* from the scsi work queue without the session lock.
* @cleanup_task: requests LLD to fail task. Called with session lock
* and after the connection has been suspended and
* terminated during recovery. If called
* from abort task then connection is not suspended
* or terminated but sk_callback_lock is held
*
@ -110,15 +112,10 @@ struct iscsi_transport {
char *data, uint32_t data_size);
void (*get_stats) (struct iscsi_cls_conn *conn,
struct iscsi_stats *stats);
int (*init_cmd_task) (struct iscsi_cmd_task *ctask);
void (*init_mgmt_task) (struct iscsi_conn *conn,
struct iscsi_mgmt_task *mtask);
int (*xmit_cmd_task) (struct iscsi_conn *conn,
struct iscsi_cmd_task *ctask);
void (*cleanup_cmd_task) (struct iscsi_conn *conn,
struct iscsi_cmd_task *ctask);
int (*xmit_mgmt_task) (struct iscsi_conn *conn,
struct iscsi_mgmt_task *mtask);
int (*init_task) (struct iscsi_cmd_task *task);
int (*xmit_task) (struct iscsi_cmd_task *task);
void (*cleanup_task) (struct iscsi_conn *conn,
struct iscsi_cmd_task *task);
void (*session_recovery_timedout) (struct iscsi_cls_session *session);
int (*ep_connect) (struct sockaddr *dst_addr, int non_blocking,
uint64_t *ep_handle);