From patchwork Tue Jul 15 14:21:46 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chuck Lever X-Patchwork-Id: 4554181 Return-Path: X-Original-To: patchwork-linux-rdma@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 4B996C0514 for ; Tue, 15 Jul 2014 14:21:59 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 5686F2011E for ; Tue, 15 Jul 2014 14:21:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D427320158 for ; Tue, 15 Jul 2014 14:21:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753116AbaGOOVv (ORCPT ); Tue, 15 Jul 2014 10:21:51 -0400 Received: from mail-ie0-f182.google.com ([209.85.223.182]:33494 "EHLO mail-ie0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751527AbaGOOVt (ORCPT ); Tue, 15 Jul 2014 10:21:49 -0400 Received: by mail-ie0-f182.google.com with SMTP id y20so4612169ier.27 for ; Tue, 15 Jul 2014 07:21:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:subject:from:to:date:message-id:in-reply-to:references :user-agent:mime-version:content-type:content-transfer-encoding; bh=tRg/Ms87JkmA2nsF16Q1smK6/6vaesBNb1MOJvrdus4=; b=pTEw/5VRW158iyuCiy+0HaNhpfeKY+EjXn2w53iOJMfl++AlrMImApimoz/ac8Msp3 gzrfOc0DExRsPQCD441F9OCLZ4lMWb+JtjwsuLdcDNm8vDPo0xiTYXyQDc2WuBbuUKB0 jEUkpVkQIGToaW/Sx5+bhs2XvA0MRAM2xagNdb0hRUKfjCu4oBSaWTpCM0o4HB84hVFi qr5KwShZjS+aTmyGeoFVAQg4UMyg0xw3PmHEzrvKY1fARMdaXMVr42/SZWoD2csWCk0N rF+GjJZmzP0iqGxPFSfZ7XBxqHXD8s6bizVszeu6yect5ed6nNC383qtbhYLgPTM6SZe +Vbg== X-Received: by 10.50.43.202 with SMTP id y10mr6937865igl.10.1405434108215; Tue, 15 Jul 2014 07:21:48 -0700 (PDT) Received: from manet.1015granger.net ([2604:8800:100:81fc:82ee:73ff:fe43:d64f]) by mx.google.com with ESMTPSA id gb7sm35214378igd.16.2014.07.15.07.21.47 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 15 Jul 2014 07:21:47 -0700 (PDT) Subject: [PATCH v3 11/21] xprtrdma: Reset FRMRs when FAST_REG_MR is flushed by a disconnect From: Chuck Lever To: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Date: Tue, 15 Jul 2014 10:21:46 -0400 Message-ID: <20140715142146.8908.9010.stgit@manet.1015granger.net> In-Reply-To: <20140715142020.8908.80969.stgit@manet.1015granger.net> References: <20140715142020.8908.80969.stgit@manet.1015granger.net> User-Agent: StGit/0.17.1-3-g7d0f MIME-Version: 1.0 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,RP_MATCHES_RCVD,T_DKIM_INVALID,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP FAST_REG_MR Work Requests update a Memory Region's rkey. Rkey's are used to block unwanted access to the memory controlled by an MR. The rkey is passed to the receiver (the NFS server, in our case), and is also used by xprtrdma to invalidate the MR when the RPC is complete. When a FAST_REG_MR Work Request is flushed after a transport disconnect, xprtrdma cannot tell whether the WR actually hit the adapter or not. So it is indeterminant at that point whether the existing rkey is still valid. After the transport connection is re-established, the next FAST_REG_MR or LOCAL_INV Work Request against that MR can sometimes fail because the rkey value does not match what xprtrdma expects. The only reliable way to recover in this case is to deregister and register the MR before it is used again. These operations can be done only in a process context, so handle it in the transport connect worker. Signed-off-by: Chuck Lever Tested-by: Steve Wise --- net/sunrpc/xprtrdma/verbs.c | 67 ++++++++++++++++++++++++++++++++++++++- net/sunrpc/xprtrdma/xprt_rdma.h | 1 + 2 files changed, 66 insertions(+), 2 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index cdea6ff..39b31c8 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -61,6 +61,8 @@ # define RPCDBG_FACILITY RPCDBG_TRANS #endif +static void rpcrdma_reset_frmrs(struct rpcrdma_ia *); + /* * internal functions */ @@ -152,8 +154,10 @@ rpcrdma_sendcq_process_wc(struct ib_wc *wc) if (wc->wr_id == 0ULL) return; - if (wc->status != IB_WC_SUCCESS) + if (wc->status != IB_WC_SUCCESS) { + frmr->r.frmr.fr_state = FRMR_IS_STALE; return; + } if (wc->opcode == IB_WC_FAST_REG_MR) frmr->r.frmr.fr_state = FRMR_IS_VALID; @@ -881,6 +885,9 @@ retry: " status %i\n", __func__, rc); rpcrdma_flush_cqs(ep); + if (ia->ri_memreg_strategy == RPCRDMA_FRMR) + rpcrdma_reset_frmrs(ia); + xprt = container_of(ia, struct rpcrdma_xprt, rx_ia); id = rpcrdma_create_id(xprt, ia, (struct sockaddr *)&xprt->rx_data.addr); @@ -1256,6 +1263,62 @@ rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf) kfree(buf->rb_pool); } +/* After a disconnect, a flushed FAST_REG_MR can leave an FRMR in + * an unusable state. Find FRMRs in this state and dereg / reg + * each. FRMRs that are VALID and attached to an rpcrdma_req are + * also torn down. + * + * This gives all in-use FRMRs a fresh rkey and leaves them INVALID. + * + * This is invoked only in the transport connect worker in order + * to serialize with rpcrdma_register_frmr_external(). + */ +static void +rpcrdma_reset_frmrs(struct rpcrdma_ia *ia) +{ + struct rpcrdma_xprt *r_xprt = + container_of(ia, struct rpcrdma_xprt, rx_ia); + struct rpcrdma_buffer *buf = &r_xprt->rx_buf; + struct list_head *pos; + struct rpcrdma_mw *r; + int rc; + + list_for_each(pos, &buf->rb_all) { + r = list_entry(pos, struct rpcrdma_mw, mw_all); + + if (r->r.frmr.fr_state == FRMR_IS_INVALID) + continue; + + rc = ib_dereg_mr(r->r.frmr.fr_mr); + if (rc) + dprintk("RPC: %s: ib_dereg_mr failed %i\n", + __func__, rc); + ib_free_fast_reg_page_list(r->r.frmr.fr_pgl); + + r->r.frmr.fr_mr = ib_alloc_fast_reg_mr(ia->ri_pd, + ia->ri_max_frmr_depth); + if (IS_ERR(r->r.frmr.fr_mr)) { + rc = PTR_ERR(r->r.frmr.fr_mr); + dprintk("RPC: %s: ib_alloc_fast_reg_mr" + " failed %i\n", __func__, rc); + continue; + } + r->r.frmr.fr_pgl = ib_alloc_fast_reg_page_list( + ia->ri_id->device, + ia->ri_max_frmr_depth); + if (IS_ERR(r->r.frmr.fr_pgl)) { + rc = PTR_ERR(r->r.frmr.fr_pgl); + dprintk("RPC: %s: " + "ib_alloc_fast_reg_page_list " + "failed %i\n", __func__, rc); + + ib_dereg_mr(r->r.frmr.fr_mr); + continue; + } + r->r.frmr.fr_state = FRMR_IS_INVALID; + } +} + /* "*mw" can be NULL when rpcrdma_buffer_get_mrs() fails, leaving * some req segments uninitialized. */ @@ -1571,7 +1634,7 @@ 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_VALID)) { + if (unlikely(frmr->fr_state != FRMR_IS_INVALID)) { dprintk("RPC: %s: frmr %x left valid, posting invalidate.\n", __func__, mr->rkey); /* Invalidate before using. */ diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h index c1d8652..1ee6db3 100644 --- a/net/sunrpc/xprtrdma/xprt_rdma.h +++ b/net/sunrpc/xprtrdma/xprt_rdma.h @@ -161,6 +161,7 @@ struct rpcrdma_rep { enum rpcrdma_frmr_state { FRMR_IS_INVALID, /* ready to be used */ FRMR_IS_VALID, /* in use */ + FRMR_IS_STALE, /* failed completion */ }; struct rpcrdma_frmr {