mirrors/scst
1
0
Fork 0
mirror of https://github.com/SCST-project/scst.git synced 2026-05-17 10:41:26 +00:00
Code Issues Packages Projects Releases Wiki Activity

ib_srpt: Micro-optimize srpt_adjust_srq_wr_avail()

Browse Source 
The overhead of atomic_add_return() is lower than that of a
spin_lock() / spin_unlock() pair, hence switch to the former.


git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@5367 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Bart Van Assche
2014-03-24 12:01:07 +00:00
parent a0cd399507
commit de3ed1e6ec
2 changed files with 3 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
srpt/src/ib_srpt.c
View File

@@ -925,15 +925,7 @@ static int srpt_post_recv(struct srpt_device *sdev,
static int srpt_adjust_srq_wr_avail(struct srpt_rdma_ch *ch, int delta)
{
int res;
unsigned long flags;
spin_lock_irqsave(&ch->spinlock, flags);
ch->sq_wr_avail += delta;
res = ch->sq_wr_avail;
spin_unlock_irqrestore(&ch->spinlock, flags);
return res;
return atomic_add_return(delta, &ch->sq_wr_avail);
}
/**
@@ -2158,7 +2150,7 @@ static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
TRACE_DBG("qp_num = %#x", ch->qp->qp_num);
ch->sq_wr_avail = qp_init->cap.max_send_wr;
atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr);
TRACE_DBG("%s: max_cqe= %d max_sge= %d sq_size = %d"
" cm_id= %p", __func__, ch->cq->cqe,

2
srpt/src/ib_srpt.h
View File

@@ -338,7 +338,7 @@ struct srpt_rdma_ch {
int rq_size;
int max_sge;
int max_rsp_size;
int sq_wr_avail;
atomic_t sq_wr_avail;
struct srpt_port *sport;
struct srpt_tgt *srpt_tgt;
int max_ti_iu_len;