Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-ie0-f174.google.com ([209.85.223.174]:58870 "EHLO mail-ie0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755626AbaGVOwp (ORCPT ); Tue, 22 Jul 2014 10:52:45 -0400 Subject: [PATCH v4 12/21] xprtrdma: Reset FRMRs after a flushed LOCAL_INV Work Request From: Chuck Lever To: Anna.Schumaker@netapp.com Cc: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Date: Tue, 22 Jul 2014 10:52:43 -0400 Message-ID: <20140722145243.6010.3263.stgit@manet.1015granger.net> In-Reply-To: <20140722144459.6010.99389.stgit@manet.1015granger.net> References: <20140722144459.6010.99389.stgit@manet.1015granger.net> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-nfs-owner@vger.kernel.org List-ID: When a LOCAL_INV Work Request is flushed, it leaves an FRMR in the VALID state. This FRMR can be returned by rpcrdma_buffer_get(), and must be knocked down in rpcrdma_register_frmr_external() before it can be re-used. Instead, capture these in rpcrdma_buffer_get(), and reset them. Signed-off-by: Chuck Lever Tested-by: Steve Wise Tested-by: Shirley Ma Tested-by: Devesh Sharma --- net/sunrpc/xprtrdma/verbs.c | 94 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 92 insertions(+), 2 deletions(-) diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index 39b31c8..24168e8 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -1358,8 +1358,91 @@ rpcrdma_buffer_put_sendbuf(struct rpcrdma_req *req, struct rpcrdma_buffer *buf) } } +/* rpcrdma_unmap_one() was already done by rpcrdma_deregister_frmr_external(). + * Redo only the ib_post_send(). + */ +static void +rpcrdma_retry_local_inv(struct rpcrdma_mw *r, struct rpcrdma_ia *ia) +{ + struct rpcrdma_xprt *r_xprt = + container_of(ia, struct rpcrdma_xprt, rx_ia); + struct ib_send_wr invalidate_wr, *bad_wr; + int rc; + + dprintk("RPC: %s: FRMR %p is stale\n", __func__, r); + + /* When this FRMR is re-inserted into rb_mws, it is no longer stale */ + r->r.frmr.fr_state = FRMR_IS_VALID; + + memset(&invalidate_wr, 0, sizeof(invalidate_wr)); + invalidate_wr.wr_id = (unsigned long)(void *)r; + invalidate_wr.opcode = IB_WR_LOCAL_INV; + invalidate_wr.send_flags = IB_SEND_SIGNALED; + invalidate_wr.ex.invalidate_rkey = r->r.frmr.fr_mr->rkey; + DECR_CQCOUNT(&r_xprt->rx_ep); + + dprintk("RPC: %s: frmr %p invalidating rkey %08x\n", + __func__, r, r->r.frmr.fr_mr->rkey); + + read_lock(&ia->ri_qplock); + rc = ib_post_send(ia->ri_id->qp, &invalidate_wr, &bad_wr); + read_unlock(&ia->ri_qplock); + if (rc) { + /* Force rpcrdma_buffer_get() to retry */ + r->r.frmr.fr_state = FRMR_IS_STALE; + dprintk("RPC: %s: ib_post_send failed, %i\n", + __func__, rc); + } +} + +static void +rpcrdma_retry_flushed_linv(struct list_head *stale, + struct rpcrdma_buffer *buf) +{ + struct rpcrdma_ia *ia = rdmab_to_ia(buf); + struct list_head *pos; + struct rpcrdma_mw *r; + unsigned long flags; + + list_for_each(pos, stale) { + r = list_entry(pos, struct rpcrdma_mw, mw_list); + rpcrdma_retry_local_inv(r, ia); + } + + spin_lock_irqsave(&buf->rb_lock, flags); + list_splice_tail(stale, &buf->rb_mws); + spin_unlock_irqrestore(&buf->rb_lock, flags); +} + static struct rpcrdma_req * -rpcrdma_buffer_get_mrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf) +rpcrdma_buffer_get_frmrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf, + struct list_head *stale) +{ + struct rpcrdma_mw *r; + int i; + + i = RPCRDMA_MAX_SEGS - 1; + while (!list_empty(&buf->rb_mws)) { + r = list_entry(buf->rb_mws.next, + struct rpcrdma_mw, mw_list); + list_del(&r->mw_list); + if (r->r.frmr.fr_state == FRMR_IS_STALE) { + list_add(&r->mw_list, stale); + continue; + } + req->rl_segments[i].mr_chunk.rl_mw = r; + if (unlikely(i-- == 0)) + return req; /* Success */ + } + + /* Not enough entries on rb_mws for this req */ + rpcrdma_buffer_put_sendbuf(req, buf); + rpcrdma_buffer_put_mrs(req, buf); + return NULL; +} + +static struct rpcrdma_req * +rpcrdma_buffer_get_fmrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf) { struct rpcrdma_mw *r; int i; @@ -1393,6 +1476,7 @@ struct rpcrdma_req * rpcrdma_buffer_get(struct rpcrdma_buffer *buffers) { struct rpcrdma_ia *ia = rdmab_to_ia(buffers); + struct list_head stale; struct rpcrdma_req *req; unsigned long flags; @@ -1414,15 +1498,21 @@ rpcrdma_buffer_get(struct rpcrdma_buffer *buffers) buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL; } buffers->rb_send_bufs[buffers->rb_send_index++] = NULL; + + INIT_LIST_HEAD(&stale); switch (ia->ri_memreg_strategy) { case RPCRDMA_FRMR: + req = rpcrdma_buffer_get_frmrs(req, buffers, &stale); + break; case RPCRDMA_MTHCAFMR: - req = rpcrdma_buffer_get_mrs(req, buffers); + req = rpcrdma_buffer_get_fmrs(req, buffers); break; default: break; } spin_unlock_irqrestore(&buffers->rb_lock, flags); + if (!list_empty(&stale)) + rpcrdma_retry_flushed_linv(&stale, buffers); return req; }