Clean up: Divide the work cleanly:
- rpcrdma_wc_receive is responsible only for RDMA Receives
- rpcrdma_reply_handler is responsible only for RPC Replies
- the posted send and receive counts both belong in rpcrdma_ep
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
include/trace/events/rpcrdma.h | 2 +-
net/sunrpc/xprtrdma/backchannel.c | 1 -
net/sunrpc/xprtrdma/rpc_rdma.c | 21 +++------------------
net/sunrpc/xprtrdma/verbs.c | 31 ++++++++++++++-----------------
net/sunrpc/xprtrdma/xprt_rdma.h | 3 +--
5 files changed, 19 insertions(+), 39 deletions(-)
diff --git a/include/trace/events/rpcrdma.h b/include/trace/events/rpcrdma.h
index b093058..2efe2d7 100644
--- a/include/trace/events/rpcrdma.h
+++ b/include/trace/events/rpcrdma.h
@@ -570,7 +570,7 @@
__entry->r_xprt = r_xprt;
__entry->count = count;
__entry->status = status;
- __entry->posted = r_xprt->rx_buf.rb_posted_receives;
+ __entry->posted = r_xprt->rx_ep.rep_receive_count;
__assign_str(addr, rpcrdma_addrstr(r_xprt));
__assign_str(port, rpcrdma_portstr(r_xprt));
),
diff --git a/net/sunrpc/xprtrdma/backchannel.c b/net/sunrpc/xprtrdma/backchannel.c
index e5b367a..2cb07a3 100644
--- a/net/sunrpc/xprtrdma/backchannel.c
+++ b/net/sunrpc/xprtrdma/backchannel.c
@@ -207,7 +207,6 @@ int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst)
if (rc < 0)
goto failed_marshal;
- rpcrdma_post_recvs(r_xprt, true);
if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
goto drop_connection;
return 0;
diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index 9f53e02..dc23977 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -1312,11 +1312,6 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *rep)
u32 credits;
__be32 *p;
- --buf->rb_posted_receives;
-
- if (rep->rr_hdrbuf.head[0].iov_len == 0)
- goto out_badstatus;
-
/* Fixed transport header fields */
xdr_init_decode(&rep->rr_stream, &rep->rr_hdrbuf,
rep->rr_hdrbuf.head[0].iov_base);
@@ -1361,31 +1356,21 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *rep)
clear_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags);
trace_xprtrdma_reply(rqst->rq_task, rep, req, credits);
-
- rpcrdma_post_recvs(r_xprt, false);
queue_work(rpcrdma_receive_wq, &rep->rr_work);
return;
out_badversion:
trace_xprtrdma_reply_vers(rep);
- goto repost;
+ goto out;
-/* The RPC transaction has already been terminated, or the header
- * is corrupt.
- */
out_norqst:
spin_unlock(&xprt->queue_lock);
trace_xprtrdma_reply_rqst(rep);
- goto repost;
+ goto out;
out_shortreply:
trace_xprtrdma_reply_short(rep);
-/* If no pending RPC transaction was matched, post a replacement
- * receive buffer before returning.
- */
-repost:
- rpcrdma_post_recvs(r_xprt, false);
-out_badstatus:
+out:
rpcrdma_recv_buffer_put(rep);
}
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index b9bc7f9..e4461e7 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -78,6 +78,7 @@
static void rpcrdma_mrs_destroy(struct rpcrdma_buffer *buf);
static int rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt, bool temp);
static void rpcrdma_dma_unmap_regbuf(struct rpcrdma_regbuf *rb);
+static void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp);
struct workqueue_struct *rpcrdma_receive_wq __read_mostly;
@@ -189,11 +190,13 @@
struct ib_cqe *cqe = wc->wr_cqe;
struct rpcrdma_rep *rep = container_of(cqe, struct rpcrdma_rep,
rr_cqe);
+ struct rpcrdma_xprt *r_xprt = rep->rr_rxprt;
- /* WARNING: Only wr_id and status are reliable at this point */
+ /* WARNING: Only wr_cqe and status are reliable at this point */
trace_xprtrdma_wc_receive(wc);
+ --r_xprt->rx_ep.rep_receive_count;
if (wc->status != IB_WC_SUCCESS)
- goto out_fail;
+ goto out_flushed;
/* status == SUCCESS means all fields in wc are trustworthy */
rpcrdma_set_xdrlen(&rep->rr_hdrbuf, wc->byte_len);
@@ -204,17 +207,16 @@
rdmab_addr(rep->rr_rdmabuf),
wc->byte_len, DMA_FROM_DEVICE);
-out_schedule:
+ rpcrdma_post_recvs(r_xprt, false);
rpcrdma_reply_handler(rep);
return;
-out_fail:
+out_flushed:
if (wc->status != IB_WC_WR_FLUSH_ERR)
pr_err("rpcrdma: Recv: %s (%u/0x%x)\n",
ib_wc_status_msg(wc->status),
wc->status, wc->vendor_err);
- rpcrdma_set_xdrlen(&rep->rr_hdrbuf, 0);
- goto out_schedule;
+ rpcrdma_recv_buffer_put(rep);
}
static void
@@ -581,6 +583,7 @@
init_waitqueue_head(&ep->rep_connect_wait);
INIT_DELAYED_WORK(&ep->rep_disconnect_worker,
rpcrdma_disconnect_worker);
+ ep->rep_receive_count = 0;
sendcq = ib_alloc_cq(ia->ri_device, NULL,
ep->rep_attr.cap.max_send_wr + 1,
@@ -1174,7 +1177,6 @@ struct rpcrdma_req *
}
buf->rb_credits = 1;
- buf->rb_posted_receives = 0;
INIT_LIST_HEAD(&buf->rb_recv_bufs);
rc = rpcrdma_sendctxs_create(r_xprt);
@@ -1511,25 +1513,20 @@ struct rpcrdma_regbuf *
return 0;
}
-/**
- * rpcrdma_post_recvs - Maybe post some Receive buffers
- * @r_xprt: controlling transport
- * @temp: when true, allocate temp rpcrdma_rep objects
- *
- */
-void
+static void
rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp)
{
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
+ struct rpcrdma_ep *ep = &r_xprt->rx_ep;
struct ib_recv_wr *wr, *bad_wr;
int needed, count, rc;
rc = 0;
count = 0;
needed = buf->rb_credits + (buf->rb_bc_srv_max_requests << 1);
- if (buf->rb_posted_receives > needed)
+ if (ep->rep_receive_count > needed)
goto out;
- needed -= buf->rb_posted_receives;
+ needed -= ep->rep_receive_count;
count = 0;
wr = NULL;
@@ -1577,7 +1574,7 @@ struct rpcrdma_regbuf *
--count;
}
}
- buf->rb_posted_receives += count;
+ ep->rep_receive_count += count;
out:
trace_xprtrdma_post_recvs(r_xprt, count, rc);
}
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index a13ccb6..788124c 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -102,6 +102,7 @@ struct rpcrdma_ep {
struct rpcrdma_connect_private rep_cm_private;
struct rdma_conn_param rep_remote_cma;
struct delayed_work rep_disconnect_worker;
+ int rep_receive_count;
};
/* Pre-allocate extra Work Requests for handling backward receives
@@ -404,7 +405,6 @@ struct rpcrdma_buffer {
unsigned long rb_flags;
u32 rb_max_requests;
u32 rb_credits; /* most recent credit grant */
- int rb_posted_receives;
u32 rb_bc_srv_max_requests;
spinlock_t rb_reqslock; /* protect rb_allreqs */
@@ -560,7 +560,6 @@ int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *,
int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *,
struct rpcrdma_req *);
-void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp);
/*
* Buffer calls - xprtrdma/verbs.c
