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Freeze CAM SIM when request is postponed due to MaxCmdSN.

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This allows to avoid resource allocation (especially offload) for requests
that can not be executed at this time any way.

MFC after:	2 weeks
This commit is contained in:
mav 2017-02-17 04:34:17 +00:00
parent eb89b3878c
commit d24ded19b4
1 changed files with 10 additions and 5 deletions
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15
sys/dev/iscsi/iscsi.c
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@ -231,14 +231,16 @@ iscsi_session_send_postponed(struct iscsi_session *is)
ISCSI_SESSION_LOCK_ASSERT(is);
while (!STAILQ_EMPTY(&is->is_postponed)) {
request = STAILQ_FIRST(&is->is_postponed);
if (STAILQ_EMPTY(&is->is_postponed))
return;
while ((request = STAILQ_FIRST(&is->is_postponed)) != NULL) {
postpone = iscsi_pdu_prepare(request);
if (postpone)
break;
return;
STAILQ_REMOVE_HEAD(&is->is_postponed, ip_next);
icl_pdu_queue(request);
}
xpt_release_simq(is->is_sim, 1);
}
static void
@ -252,6 +254,8 @@ iscsi_pdu_queue_locked(struct icl_pdu *request)
iscsi_session_send_postponed(is);
postpone = iscsi_pdu_prepare(request);
if (postpone) {
if (STAILQ_EMPTY(&is->is_postponed))
xpt_freeze_simq(is->is_sim, 1);
STAILQ_INSERT_TAIL(&is->is_postponed, request, ip_next);
return;
}
@ -339,8 +343,9 @@ iscsi_session_cleanup(struct iscsi_session *is, bool destroy_sim)
/*
* Remove postponed PDUs.
*/
while (!STAILQ_EMPTY(&is->is_postponed)) {
pdu = STAILQ_FIRST(&is->is_postponed);
if (!STAILQ_EMPTY(&is->is_postponed))
xpt_release_simq(is->is_sim, 1);
while ((pdu = STAILQ_FIRST(&is->is_postponed)) != NULL) {
STAILQ_REMOVE_HEAD(&is->is_postponed, ip_next);
icl_pdu_free(pdu);
}