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IB/srpt: Simplify channel state management 

The only allowed channel state changes are those that change
the channel state into a state with a higher numerical value.
This allows to merge the functions srpt_set_ch_state() and
srpt_test_and_set_ch_state() into a single function.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Cc: Alex Estrin <alex.estrin@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bart Van Assche 2016-02-11 11:05:38 -08:00 committed by Doug Ledford
parent e1dd413ccf
commit f130c2205d
1 changed files with 13 additions and 31 deletions
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44
drivers/infiniband/ulp/srpt/ib_srpt.c
View File

@ -96,37 +96,25 @@ static int srpt_queue_status(struct se_cmd *cmd);
static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc); static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc);
static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc); static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc);
static enum rdma_ch_state /*
srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new_state) * The only allowed channel state changes are those that change the channel
{ * state into a state with a higher numerical value. Hence the new > prev test.
unsigned long flags;
enum rdma_ch_state prev;
spin_lock_irqsave(&ch->spinlock, flags);
prev = ch->state;
ch->state = new_state;
spin_unlock_irqrestore(&ch->spinlock, flags);
return prev;
}
/**
* srpt_test_and_set_ch_state() - Test and set the channel state.
*
* Returns true if and only if the channel state has been set to the new state.
*/ */
static bool static bool srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new)
srpt_test_and_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state old,
enum rdma_ch_state new)
{ {
unsigned long flags; unsigned long flags;
enum rdma_ch_state prev; enum rdma_ch_state prev;
bool changed = false;
spin_lock_irqsave(&ch->spinlock, flags); spin_lock_irqsave(&ch->spinlock, flags);
prev = ch->state; prev = ch->state;
if (prev == old) if (new > prev) {
ch->state = new; ch->state = new;
changed = true;
}
spin_unlock_irqrestore(&ch->spinlock, flags); spin_unlock_irqrestore(&ch->spinlock, flags);
return prev == old;
return changed;
} }
/** /**
@ -199,8 +187,7 @@ static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch)
ib_cm_notify(ch->cm_id, event->event); ib_cm_notify(ch->cm_id, event->event);
break; break;
case IB_EVENT_QP_LAST_WQE_REACHED: case IB_EVENT_QP_LAST_WQE_REACHED:
if (srpt_test_and_set_ch_state(ch, CH_DRAINING, if (srpt_set_ch_state(ch, CH_RELEASING))
CH_RELEASING))
srpt_release_channel(ch); srpt_release_channel(ch);
else else
pr_debug("%s: state %d - ignored LAST_WQE.\n", pr_debug("%s: state %d - ignored LAST_WQE.\n",
@ -1947,12 +1934,7 @@ static void srpt_drain_channel(struct ib_cm_id *cm_id)
spin_lock_irq(&sdev->spinlock); spin_lock_irq(&sdev->spinlock);
list_for_each_entry(ch, &sdev->rch_list, list) { list_for_each_entry(ch, &sdev->rch_list, list) {
if (ch->cm_id == cm_id) { if (ch->cm_id == cm_id) {
do_reset = srpt_test_and_set_ch_state(ch, do_reset = srpt_set_ch_state(ch, CH_DRAINING);
CH_CONNECTING, CH_DRAINING) ||
srpt_test_and_set_ch_state(ch,
CH_LIVE, CH_DRAINING) ||
srpt_test_and_set_ch_state(ch,
CH_DISCONNECTING, CH_DRAINING);
break; break;
} }
} }
@ -2353,7 +2335,7 @@ static void srpt_cm_rtu_recv(struct ib_cm_id *cm_id)
ch = srpt_find_channel(cm_id->context, cm_id); ch = srpt_find_channel(cm_id->context, cm_id);
BUG_ON(!ch); BUG_ON(!ch);
if (srpt_test_and_set_ch_state(ch, CH_CONNECTING, CH_LIVE)) { if (srpt_set_ch_state(ch, CH_LIVE)) {
struct srpt_recv_ioctx *ioctx, *ioctx_tmp; struct srpt_recv_ioctx *ioctx, *ioctx_tmp;
ret = srpt_ch_qp_rts(ch, ch->qp); ret = srpt_ch_qp_rts(ch, ch->qp);