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IB/iser: Optimize completion polling

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Poll in batch of 16. Since we don't want it on the stack, keep under
iser completion context (iser_comp).

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Sagi Grimberg 2014-10-01 14:02:11 +03:00 committed by Roland Dreier
parent ff3dd52d26
commit 6e6fe2fb1d
2 changed files with 11 additions and 5 deletions
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4
drivers/infiniband/ulp/iser/iscsi_iser.h
View file

@ -145,6 +145,8 @@
ISER_MAX_TX_MISC_PDUS + \
ISER_MAX_RX_MISC_PDUS)
#define ISER_WC_BATCH_COUNT 16
#define ISER_VER 0x10
#define ISER_WSV 0x08
#define ISER_RSV 0x04
@ -273,6 +275,7 @@ struct iscsi_iser_task;
*
* @device: pointer to device handle
* @cq: completion queue
* @wcs: work completion array
* @tasklet: Tasklet handle
* @active_qps: Number of active QPs attached
* to completion context
@ -280,6 +283,7 @@ struct iscsi_iser_task;
struct iser_comp {
struct iser_device *device;
struct ib_cq *cq;
struct ib_wc wcs[ISER_WC_BATCH_COUNT];
struct tasklet_struct tasklet;
int active_qps;
};

12
drivers/infiniband/ulp/iser/iser_verbs.c
View file

@ -1232,13 +1232,15 @@ static void iser_cq_tasklet_fn(unsigned long data)
{
struct iser_comp *comp = (struct iser_comp *)data;
struct ib_cq *cq = comp->cq;
struct ib_wc wc;
int completed = 0;
struct ib_wc *const wcs = comp->wcs;
int i, n, completed = 0;
while (ib_poll_cq(cq, 1, &wc) == 1) {
iser_handle_wc(&wc);
while ((n = ib_poll_cq(cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) {
for (i = 0; i < n; i++)
iser_handle_wc(&wcs[i]);
if (++completed >= iser_cq_poll_limit)
completed += n;
if (completed >= iser_cq_poll_limit)
break;
}