From 6d2d0ee27c7a12371a0ca51a5db414204901228c Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Wed, 19 Dec 2018 10:58:29 -0500 Subject: [PATCH] xprtrdma: Replace rpcrdma_receive_wq with a per-xprt workqueue To address a connection-close ordering problem, we need the ability to drain the RPC completions running on rpcrdma_receive_wq for just one transport. Give each transport its own RPC completion workqueue, and drain that workqueue when disconnecting the transport. Signed-off-by: Chuck Lever Signed-off-by: Anna Schumaker --- net/sunrpc/xprtrdma/rpc_rdma.c | 2 +- net/sunrpc/xprtrdma/transport.c | 17 +++------ net/sunrpc/xprtrdma/verbs.c | 67 ++++++++++++++++++--------------- net/sunrpc/xprtrdma/xprt_rdma.h | 6 +-- 4 files changed, 44 insertions(+), 48 deletions(-) diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c index dc2397731c5c6..5738c9f021444 100644 --- a/net/sunrpc/xprtrdma/rpc_rdma.c +++ b/net/sunrpc/xprtrdma/rpc_rdma.c @@ -1356,7 +1356,7 @@ 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); - queue_work(rpcrdma_receive_wq, &rep->rr_work); + queue_work(buf->rb_completion_wq, &rep->rr_work); return; out_badversion: diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c index ae2a838289537..91c476a8f51c3 100644 --- a/net/sunrpc/xprtrdma/transport.c +++ b/net/sunrpc/xprtrdma/transport.c @@ -444,10 +444,14 @@ xprt_rdma_close(struct rpc_xprt *xprt) struct rpcrdma_ep *ep = &r_xprt->rx_ep; struct rpcrdma_ia *ia = &r_xprt->rx_ia; + might_sleep(); + dprintk("RPC: %s: closing xprt %p\n", __func__, xprt); + /* Prevent marshaling and sending of new requests */ + xprt_clear_connected(xprt); + if (test_and_clear_bit(RPCRDMA_IAF_REMOVING, &ia->ri_flags)) { - xprt_clear_connected(xprt); rpcrdma_ia_remove(ia); return; } @@ -858,8 +862,6 @@ void xprt_rdma_cleanup(void) dprintk("RPC: %s: xprt_unregister returned %i\n", __func__, rc); - rpcrdma_destroy_wq(); - rc = xprt_unregister_transport(&xprt_rdma_bc); if (rc) dprintk("RPC: %s: xprt_unregister(bc) returned %i\n", @@ -870,20 +872,13 @@ int xprt_rdma_init(void) { int rc; - rc = rpcrdma_alloc_wq(); - if (rc) - return rc; - rc = xprt_register_transport(&xprt_rdma); - if (rc) { - rpcrdma_destroy_wq(); + if (rc) return rc; - } rc = xprt_register_transport(&xprt_rdma_bc); if (rc) { xprt_unregister_transport(&xprt_rdma); - rpcrdma_destroy_wq(); return rc; } diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index e4461e7c1b0c4..cff3a5df0b905 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -80,33 +80,23 @@ 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; - -int -rpcrdma_alloc_wq(void) +/* Wait for outstanding transport work to finish. + */ +static void rpcrdma_xprt_drain(struct rpcrdma_xprt *r_xprt) { - struct workqueue_struct *recv_wq; - - recv_wq = alloc_workqueue("xprtrdma_receive", - WQ_MEM_RECLAIM | WQ_HIGHPRI, - 0); - if (!recv_wq) - return -ENOMEM; - - rpcrdma_receive_wq = recv_wq; - return 0; -} + struct rpcrdma_buffer *buf = &r_xprt->rx_buf; + struct rpcrdma_ia *ia = &r_xprt->rx_ia; -void -rpcrdma_destroy_wq(void) -{ - struct workqueue_struct *wq; + /* Flush Receives, then wait for deferred Reply work + * to complete. + */ + ib_drain_qp(ia->ri_id->qp); + drain_workqueue(buf->rb_completion_wq); - if (rpcrdma_receive_wq) { - wq = rpcrdma_receive_wq; - rpcrdma_receive_wq = NULL; - destroy_workqueue(wq); - } + /* Deferred Reply processing might have scheduled + * local invalidations. + */ + ib_drain_sq(ia->ri_id->qp); } /** @@ -483,7 +473,7 @@ rpcrdma_ia_remove(struct rpcrdma_ia *ia) * connection is already gone. */ if (ia->ri_id->qp) { - ib_drain_qp(ia->ri_id->qp); + rpcrdma_xprt_drain(r_xprt); rdma_destroy_qp(ia->ri_id); ia->ri_id->qp = NULL; } @@ -825,8 +815,10 @@ out_noupdate: return rc; } -/* - * rpcrdma_ep_disconnect +/** + * rpcrdma_ep_disconnect - Disconnect underlying transport + * @ep: endpoint to disconnect + * @ia: associated interface adapter * * This is separate from destroy to facilitate the ability * to reconnect without recreating the endpoint. @@ -837,19 +829,20 @@ out_noupdate: void rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) { + struct rpcrdma_xprt *r_xprt = container_of(ep, struct rpcrdma_xprt, + rx_ep); int rc; + /* returns without wait if ID is not connected */ rc = rdma_disconnect(ia->ri_id); if (!rc) - /* returns without wait if not connected */ wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 1); else ep->rep_connected = rc; - trace_xprtrdma_disconnect(container_of(ep, struct rpcrdma_xprt, - rx_ep), rc); + trace_xprtrdma_disconnect(r_xprt, rc); - ib_drain_qp(ia->ri_id->qp); + rpcrdma_xprt_drain(r_xprt); } /* Fixed-size circular FIFO queue. This implementation is wait-free and @@ -1183,6 +1176,13 @@ rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt) if (rc) goto out; + buf->rb_completion_wq = alloc_workqueue("rpcrdma-%s", + WQ_MEM_RECLAIM | WQ_HIGHPRI, + 0, + r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR]); + if (!buf->rb_completion_wq) + goto out; + return 0; out: rpcrdma_buffer_destroy(buf); @@ -1241,6 +1241,11 @@ rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf) { cancel_delayed_work_sync(&buf->rb_refresh_worker); + if (buf->rb_completion_wq) { + destroy_workqueue(buf->rb_completion_wq); + buf->rb_completion_wq = NULL; + } + rpcrdma_sendctxs_destroy(buf); while (!list_empty(&buf->rb_recv_bufs)) { diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h index 788124cd9258e..3f198cde41e30 100644 --- a/net/sunrpc/xprtrdma/xprt_rdma.h +++ b/net/sunrpc/xprtrdma/xprt_rdma.h @@ -412,6 +412,7 @@ struct rpcrdma_buffer { u32 rb_bc_max_requests; + struct workqueue_struct *rb_completion_wq; struct delayed_work rb_refresh_worker; }; #define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia) @@ -547,8 +548,6 @@ void rpcrdma_ia_close(struct rpcrdma_ia *); bool frwr_is_supported(struct rpcrdma_ia *); bool fmr_is_supported(struct rpcrdma_ia *); -extern struct workqueue_struct *rpcrdma_receive_wq; - /* * Endpoint calls - xprtrdma/verbs.c */ @@ -603,9 +602,6 @@ rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb) return __rpcrdma_dma_map_regbuf(ia, rb); } -int rpcrdma_alloc_wq(void); -void rpcrdma_destroy_wq(void); - /* * Wrappers for chunk registration, shared by read/write chunk code. */ -- 2.39.2