On 04/04/2016 03:41 PM, Nicholas A. Bellinger wrote:
On Mon, 2016-04-04 at 11:40 -0700, Bart Van Assche wrote:
On 04/04/2016 11:28 AM, Nicholas A. Bellinger wrote:
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index 0bd3cb2..c4e0a0a 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -1266,7 +1266,9 @@ static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
{
struct se_session *se_sess;
struct srpt_send_ioctx *ioctx;
- int tag;
+ void *buf;
+ dma_addr_t dma;
+ int tag, index;
BUG_ON(!ch);
se_sess = ch->sess;
@@ -1277,12 +1279,19 @@ static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
return NULL;
}
ioctx = &((struct srpt_send_ioctx *)se_sess->sess_cmd_map)[tag];
+ buf = ioctx->ioctx.buf;
+ dma = ioctx->ioctx.dma;
+ index = ioctx->ioctx.index;
+
memset(ioctx, 0, sizeof(struct srpt_send_ioctx));
ioctx->ch = ch;
spin_lock_init(&ioctx->spinlock);
ioctx->state = SRPT_STATE_NEW;
init_completion(&ioctx->tx_done);
+ ioctx->ioctx.buf = buf;
+ ioctx->ioctx.dma = dma;
+ ioctx->ioctx.index = index;
ioctx->cmd.map_tag = tag;
return ioctx;
@@ -1961,6 +1970,24 @@ static void srpt_free_ch(struct kref *kref)
kfree(ch);
}
These assignments should happen once, namely just after I/O context
allocation, instead of performing these assignments during every
srpt_get_send_ioctx() call.
No, the entire structure is being cleared each time, just like what
every other driver is doing here.
Don't try to micro-optimize to avoid doing memset.
But why to keep that memset(ioctx, ...) call? That memset() call is new.
It was added during the 4.6-rc1 merge window.
Bart.
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