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.
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