Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-ie0-f177.google.com ([209.85.223.177]:35438 "EHLO mail-ie0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754309AbaG2VZF (ORCPT ); Tue, 29 Jul 2014 17:25:05 -0400 Subject: [PATCH v5 13/21] xprtrdma: Don't post a LOCAL_INV in rpcrdma_register_frmr_external() From: Chuck Lever To: Anna.Schumaker@netapp.com Cc: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Date: Tue, 29 Jul 2014 17:25:03 -0400 Message-ID: <20140729212503.2812.14645.stgit@manet.1015granger.net> In-Reply-To: <20140729211534.2812.3128.stgit@manet.1015granger.net> References: <20140729211534.2812.3128.stgit@manet.1015granger.net> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-nfs-owner@vger.kernel.org List-ID: Any FRMR arriving in rpcrdma_register_frmr_external() is now guaranteed to be either invalid, or to be targeted by a queued LOCAL_INV that will invalidate it before the adapter processes the FAST_REG_MR being built here. The problem with current arrangement of chaining a LOCAL_INV to the FAST_REG_MR is that if the transport is not connected, the LOCAL_INV is flushed and the FAST_REG_MR is flushed. This leaves the FRMR valid with the old rkey. But rpcrdma_register_frmr_external() has already bumped the in-memory rkey. Next time through rpcrdma_register_frmr_external(), a LOCAL_INV and FAST_REG_MR is attempted again because the FRMR is still valid. But the rkey no longer matches the hardware's rkey, and a memory management operation error occurs. Signed-off-by: Chuck Lever Tested-by: Steve Wise Tested-by: Shirley Ma Tested-by: Devesh Sharma --- net/sunrpc/xprtrdma/verbs.c | 22 ++-------------------- 1 file changed, 2 insertions(+), 20 deletions(-) diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index 2e91745..8da9a35 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -1692,8 +1692,7 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg, struct rpcrdma_mw *mw = seg1->mr_chunk.rl_mw; struct rpcrdma_frmr *frmr = &mw->r.frmr; struct ib_mr *mr = frmr->fr_mr; - struct ib_send_wr invalidate_wr, frmr_wr, *bad_wr, *post_wr; - + struct ib_send_wr frmr_wr, *bad_wr; u8 key; int len, pageoff; int i, rc; @@ -1725,22 +1724,6 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg, dprintk("RPC: %s: Using frmr %p to map %d segments\n", __func__, mw, i); - if (unlikely(frmr->fr_state != FRMR_IS_INVALID)) { - dprintk("RPC: %s: frmr %x left valid, posting invalidate.\n", - __func__, mr->rkey); - /* Invalidate before using. */ - memset(&invalidate_wr, 0, sizeof invalidate_wr); - invalidate_wr.wr_id = (unsigned long)(void *)mw; - invalidate_wr.next = &frmr_wr; - invalidate_wr.opcode = IB_WR_LOCAL_INV; - invalidate_wr.send_flags = IB_SEND_SIGNALED; - invalidate_wr.ex.invalidate_rkey = mr->rkey; - DECR_CQCOUNT(&r_xprt->rx_ep); - post_wr = &invalidate_wr; - } else - post_wr = &frmr_wr; - - /* Prepare FRMR WR */ memset(&frmr_wr, 0, sizeof frmr_wr); frmr_wr.wr_id = (unsigned long)(void *)mw; frmr_wr.opcode = IB_WR_FAST_REG_MR; @@ -1765,8 +1748,7 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg, frmr_wr.wr.fast_reg.rkey = mr->rkey; DECR_CQCOUNT(&r_xprt->rx_ep); - rc = ib_post_send(ia->ri_id->qp, post_wr, &bad_wr); - + rc = ib_post_send(ia->ri_id->qp, &frmr_wr, &bad_wr); if (rc) { dprintk("RPC: %s: failed ib_post_send for register," " status %i\n", __func__, rc);