From: Mike Christie <michaelc@xxxxxxxxxxx>
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@xxxxxxxxxxx>
---
drivers/scsi/libiscsi.c | 518 +++++++++++++++++------------------
include/scsi/libiscsi.h | 29 +--
include/scsi/scsi_transport_iscsi.h | 41 ++--
3 files changed, 272 insertions(+), 316 deletions(-)
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 1e605de..ef92b1b 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -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("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);
+ debug_scsi("[op 0x%x cid %d itt 0x%x len %d]\n",
+ opcode, conn->id, 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 @@ done:
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)
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index 9be6a70..d1c3675 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -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
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 4028f12..3f24503 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -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);
--
1.5.4.1
--
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