AcoSail/kernel_optimize_test
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xprtrdma: Remove atomic send completion counting

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The sendctx circular queue now guarantees that xprtrdma cannot
overflow the Send Queue, so remove the remaining bits of the
original Send WQE counting mechanism.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2017-10-20 10:48:45 -04:00 committed by Anna Schumaker
parent 01bb35c89d
commit 6f0afc2825
3 changed files with 0 additions and 33 deletions
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8
net/sunrpc/xprtrdma/frwr_ops.c
View File

@ -419,7 +419,6 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE :
IB_ACCESS_REMOTE_READ;
rpcrdma_set_signaled(&r_xprt->rx_ep, &reg_wr->wr);
rc = ib_post_send(ia->ri_id->qp, &reg_wr->wr, &bad_wr);
if (rc)
goto out_senderr;
@ -507,12 +506,6 @@ frwr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct list_head *mws)
f->fr_cqe.done = frwr_wc_localinv_wake;
reinit_completion(&f->fr_linv_done);
/* Initialize CQ count, since there is always a signaled
* WR being posted here. The new cqcount depends on how
* many SQEs are about to be consumed.
*/
rpcrdma_init_cqcount(&r_xprt->rx_ep, count);
/* Transport disconnect drains the receive CQ before it
* replaces the QP. The RPC reply handler won't call us
* unless ri_id->qp is a valid pointer.
@ -545,7 +538,6 @@ frwr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct list_head *mws)
/* Find and reset the MRs in the LOCAL_INV WRs that did not
* get posted.
*/
rpcrdma_init_cqcount(&r_xprt->rx_ep, -count);
while (bad_wr) {
f = container_of(bad_wr, struct rpcrdma_frmr,
fr_invwr);

4
net/sunrpc/xprtrdma/verbs.c
View File

@ -553,10 +553,6 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
ep->rep_send_batch = min_t(unsigned int, RPCRDMA_MAX_SEND_BATCH,
cdata->max_requests >> 2);
ep->rep_send_count = ep->rep_send_batch;
ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 - 1;
if (ep->rep_cqinit <= 2)
ep->rep_cqinit = 0; /* always signal? */
rpcrdma_init_cqcount(ep, 0);
init_waitqueue_head(&ep->rep_connect_wait);
INIT_DELAYED_WORK(&ep->rep_connect_worker, rpcrdma_connect_worker);

21
net/sunrpc/xprtrdma/xprt_rdma.h
View File

@ -95,8 +95,6 @@ enum {
struct rpcrdma_ep {
unsigned int rep_send_count;
unsigned int rep_send_batch;
atomic_t rep_cqcount;
int rep_cqinit;
int rep_connected;
struct ib_qp_init_attr rep_attr;
wait_queue_head_t rep_connect_wait;
@ -106,25 +104,6 @@ struct rpcrdma_ep {
struct delayed_work rep_connect_worker;
};
static inline void
rpcrdma_init_cqcount(struct rpcrdma_ep *ep, int count)
{
atomic_set(&ep->rep_cqcount, ep->rep_cqinit - count);
}
/* To update send queue accounting, provider must take a
* send completion every now and then.
*/
static inline void
rpcrdma_set_signaled(struct rpcrdma_ep *ep, struct ib_send_wr *send_wr)
{
send_wr->send_flags = 0;
if (unlikely(atomic_sub_return(1, &ep->rep_cqcount) <= 0)) {
rpcrdma_init_cqcount(ep, 0);
send_wr->send_flags = IB_SEND_SIGNALED;
}
}
/* Pre-allocate extra Work Requests for handling backward receives
* and sends. This is a fixed value because the Work Queues are
* allocated when the forward channel is set up.