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authorChuck Lever <chuck.lever@oracle.com>2017-10-20 10:48:45 -0400
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2017-11-17 13:47:58 -0500
commit6f0afc28257dfa769c210f8f8da0f21d77e7452f (patch)
tree3b448d86a0ddc63451a42e469a95e9378ced93d4 /net
parent01bb35c89d90abe6fd1c0be001f84bbdfa7fa7d1 (diff)
downloadlinux-6f0afc28257dfa769c210f8f8da0f21d77e7452f.tar.bz2
xprtrdma: Remove atomic send completion counting
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>
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/xprtrdma/frwr_ops.c8
-rw-r--r--net/sunrpc/xprtrdma/verbs.c4
-rw-r--r--net/sunrpc/xprtrdma/xprt_rdma.h21
3 files changed, 0 insertions, 33 deletions
diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c
index 3053fb0f5cb3..404166ac958f 100644
--- a/net/sunrpc/xprtrdma/frwr_ops.c
+++ b/net/sunrpc/xprtrdma/frwr_ops.c
@@ -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 @@ reset_mrs:
/* 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);
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 9a824fe8ffc2..22128a81da63 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -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);
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index bccd5d8b9384..6e64c8259d34 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -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.