Commit 6ceea368 authored by Chuck Lever's avatar Chuck Lever Committed by Anna Schumaker

xprtrdma: Refactor Receive accounting

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: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent b674c4b4
......@@ -570,7 +570,7 @@ TRACE_EVENT(xprtrdma_post_recvs,
__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));
),
......
......@@ -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;
......
......@@ -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);
}
......@@ -78,6 +78,7 @@ static void rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt);
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 @@ rpcrdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
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 @@ rpcrdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
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 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
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 @@ rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt)
}
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 @@ rpcrdma_ep_post(struct rpcrdma_ia *ia,
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 @@ rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp)
--count;
}
}
buf->rb_posted_receives += count;
ep->rep_receive_count += count;
out:
trace_xprtrdma_post_recvs(r_xprt, count, rc);
}
......@@ -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 @@ void rpcrdma_ep_disconnect(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
......
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