Return-Path: Received: from mail-io0-f172.google.com ([209.85.223.172]:34533 "EHLO mail-io0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754486AbbKWWUk (ORCPT ); Mon, 23 Nov 2015 17:20:40 -0500 Subject: [PATCH v1 3/8] svcrdma: Add svc_rdma_get_context() API that is allowed to fail From: Chuck Lever To: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Date: Mon, 23 Nov 2015 17:20:38 -0500 Message-ID: <20151123222038.13040.61285.stgit@klimt.1015granger.net> In-Reply-To: <20151123221738.13040.26277.stgit@klimt.1015granger.net> References: <20151123221738.13040.26277.stgit@klimt.1015granger.net> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-nfs-owner@vger.kernel.org List-ID: To support backward direction calls, I'm going to add an svc_rdma_get_context() call in the client RDMA transport. Called from ->buf_alloc(), we can't sleep waiting for memory. So add an API that can get a server op_ctxt but won't sleep. Signed-off-by: Chuck Lever --- include/linux/sunrpc/svc_rdma.h | 2 ++ net/sunrpc/xprtrdma/svc_rdma_transport.c | 28 +++++++++++++++++++++++----- 2 files changed, 25 insertions(+), 5 deletions(-) diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h index 478aa30..0355067 100644 --- a/include/linux/sunrpc/svc_rdma.h +++ b/include/linux/sunrpc/svc_rdma.h @@ -222,6 +222,8 @@ extern void svc_rdma_send_error(struct svcxprt_rdma *, struct rpcrdma_msg *, extern int svc_rdma_post_recv(struct svcxprt_rdma *); extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *); extern struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *); +extern struct svc_rdma_op_ctxt *svc_rdma_get_context_gfp(struct svcxprt_rdma *, + gfp_t); extern void svc_rdma_put_context(struct svc_rdma_op_ctxt *, int); extern void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt); extern struct svc_rdma_req_map *svc_rdma_get_req_map(void); diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c index 01c7b36..58ec362 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_transport.c +++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c @@ -153,17 +153,35 @@ static void svc_rdma_bc_free(struct svc_xprt *xprt) } #endif /* CONFIG_SUNRPC_BACKCHANNEL */ -struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt) +static void svc_rdma_init_context(struct svcxprt_rdma *xprt, + struct svc_rdma_op_ctxt *ctxt) { - struct svc_rdma_op_ctxt *ctxt; - - ctxt = kmem_cache_alloc(svc_rdma_ctxt_cachep, - GFP_KERNEL | __GFP_NOFAIL); ctxt->xprt = xprt; INIT_LIST_HEAD(&ctxt->dto_q); ctxt->count = 0; ctxt->frmr = NULL; atomic_inc(&xprt->sc_ctxt_used); +} + +struct svc_rdma_op_ctxt *svc_rdma_get_context_gfp(struct svcxprt_rdma *xprt, + gfp_t flags) +{ + struct svc_rdma_op_ctxt *ctxt; + + ctxt = kmem_cache_alloc(svc_rdma_ctxt_cachep, flags); + if (!ctxt) + return NULL; + svc_rdma_init_context(xprt, ctxt); + return ctxt; +} + +struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt) +{ + struct svc_rdma_op_ctxt *ctxt; + + ctxt = kmem_cache_alloc(svc_rdma_ctxt_cachep, + GFP_KERNEL | __GFP_NOFAIL); + svc_rdma_init_context(xprt, ctxt); return ctxt; }