From: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org> To: anna.schumaker-HgOvQuBEEgTQT0dZR+AlfA@public.gmane.org Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Subject: [PATCH v3 05/22] SUNRPC: Separate buffer pointers for RPC Call and Reply messages Date: Thu, 15 Sep 2016 10:55:37 -0400 [thread overview] Message-ID: <20160915145537.11080.82121.stgit@manet.1015granger.net> (raw) In-Reply-To: <20160915143440.11080.89241.stgit-FYjufvaPoItvLzlybtyyYzGyq/o6K9yX@public.gmane.org> For xprtrdma, the RPC Call and Reply buffers are involved in real I/O operations. To start with, the DMA direction of the I/O for a Call is opposite that of a Reply. In the current arrangement, the Reply buffer address is on a four-byte alignment just past the call buffer. Would be friendlier on some platforms if that was at a DMA cache alignment instead. Because the current arrangement allocates a single memory region which contains both buffers, the RPC Reply buffer often contains a page boundary in it when the Call buffer is large enough (which is frequent). It would be a little nicer for setting up DMA operations (and possible registration of the Reply buffer) if the two buffers were separated, well-aligned, and contained as few page boundaries as possible. Now, I could just pad out the single memory region used for the pair of buffers. But frequently that would mean a lot of unused space to ensure the Reply buffer did not have a page boundary. Add a separate pointer to rpc_rqst that points right to the RPC Reply buffer. This makes no difference to xprtsock, but it will help xprtrdma in subsequent patches. Signed-off-by: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org> --- include/linux/sunrpc/xprt.h | 5 +++-- net/sunrpc/clnt.c | 2 +- net/sunrpc/sched.c | 1 + net/sunrpc/xprtrdma/transport.c | 1 + 4 files changed, 6 insertions(+), 3 deletions(-) diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h index 72c2aeb..46f069e 100644 --- a/include/linux/sunrpc/xprt.h +++ b/include/linux/sunrpc/xprt.h @@ -84,8 +84,9 @@ struct rpc_rqst { struct list_head rq_list; void *rq_buffer; /* Call XDR encode buffer */ - size_t rq_callsize, - rq_rcvsize; + size_t rq_callsize; + void *rq_rbuffer; /* Reply XDR decode buffer */ + size_t rq_rcvsize; size_t rq_xmit_bytes_sent; /* total bytes sent */ size_t rq_reply_bytes_recvd; /* total reply bytes */ /* received */ diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 4dc7ed7..07d0faa 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -1768,7 +1768,7 @@ rpc_xdr_encode(struct rpc_task *task) req->rq_buffer, req->rq_callsize); xdr_buf_init(&req->rq_rcv_buf, - (char *)req->rq_buffer + req->rq_callsize, + req->rq_rbuffer, req->rq_rcvsize); p = rpc_encode_header(task); diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index 6690ebc..5db68b3 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -891,6 +891,7 @@ int rpc_malloc(struct rpc_task *task) dprintk("RPC: %5u allocated buffer of size %zu at %p\n", task->tk_pid, size, buf); rqst->rq_buffer = buf->data; + rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize; return 0; } EXPORT_SYMBOL_GPL(rpc_malloc); diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c index ebf14ba..136caf3 100644 --- a/net/sunrpc/xprtrdma/transport.c +++ b/net/sunrpc/xprtrdma/transport.c @@ -524,6 +524,7 @@ out: dprintk("RPC: %s: size %zd, request 0x%p\n", __func__, size, req); req->rl_connect_cookie = 0; /* our reserved value */ rqst->rq_buffer = req->rl_sendbuf->rg_base; + rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_rcvsize; return 0; out_rdmabuf: -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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From: Chuck Lever <chuck.lever@oracle.com> To: anna.schumaker@netapp.com Cc: linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Subject: [PATCH v3 05/22] SUNRPC: Separate buffer pointers for RPC Call and Reply messages Date: Thu, 15 Sep 2016 10:55:37 -0400 [thread overview] Message-ID: <20160915145537.11080.82121.stgit@manet.1015granger.net> (raw) In-Reply-To: <20160915143440.11080.89241.stgit@manet.1015granger.net> For xprtrdma, the RPC Call and Reply buffers are involved in real I/O operations. To start with, the DMA direction of the I/O for a Call is opposite that of a Reply. In the current arrangement, the Reply buffer address is on a four-byte alignment just past the call buffer. Would be friendlier on some platforms if that was at a DMA cache alignment instead. Because the current arrangement allocates a single memory region which contains both buffers, the RPC Reply buffer often contains a page boundary in it when the Call buffer is large enough (which is frequent). It would be a little nicer for setting up DMA operations (and possible registration of the Reply buffer) if the two buffers were separated, well-aligned, and contained as few page boundaries as possible. Now, I could just pad out the single memory region used for the pair of buffers. But frequently that would mean a lot of unused space to ensure the Reply buffer did not have a page boundary. Add a separate pointer to rpc_rqst that points right to the RPC Reply buffer. This makes no difference to xprtsock, but it will help xprtrdma in subsequent patches. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> --- include/linux/sunrpc/xprt.h | 5 +++-- net/sunrpc/clnt.c | 2 +- net/sunrpc/sched.c | 1 + net/sunrpc/xprtrdma/transport.c | 1 + 4 files changed, 6 insertions(+), 3 deletions(-) diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h index 72c2aeb..46f069e 100644 --- a/include/linux/sunrpc/xprt.h +++ b/include/linux/sunrpc/xprt.h @@ -84,8 +84,9 @@ struct rpc_rqst { struct list_head rq_list; void *rq_buffer; /* Call XDR encode buffer */ - size_t rq_callsize, - rq_rcvsize; + size_t rq_callsize; + void *rq_rbuffer; /* Reply XDR decode buffer */ + size_t rq_rcvsize; size_t rq_xmit_bytes_sent; /* total bytes sent */ size_t rq_reply_bytes_recvd; /* total reply bytes */ /* received */ diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 4dc7ed7..07d0faa 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -1768,7 +1768,7 @@ rpc_xdr_encode(struct rpc_task *task) req->rq_buffer, req->rq_callsize); xdr_buf_init(&req->rq_rcv_buf, - (char *)req->rq_buffer + req->rq_callsize, + req->rq_rbuffer, req->rq_rcvsize); p = rpc_encode_header(task); diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index 6690ebc..5db68b3 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -891,6 +891,7 @@ int rpc_malloc(struct rpc_task *task) dprintk("RPC: %5u allocated buffer of size %zu at %p\n", task->tk_pid, size, buf); rqst->rq_buffer = buf->data; + rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize; return 0; } EXPORT_SYMBOL_GPL(rpc_malloc); diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c index ebf14ba..136caf3 100644 --- a/net/sunrpc/xprtrdma/transport.c +++ b/net/sunrpc/xprtrdma/transport.c @@ -524,6 +524,7 @@ out: dprintk("RPC: %s: size %zd, request 0x%p\n", __func__, size, req); req->rl_connect_cookie = 0; /* our reserved value */ rqst->rq_buffer = req->rl_sendbuf->rg_base; + rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_rcvsize; return 0; out_rdmabuf:
next prev parent reply other threads:[~2016-09-15 14:55 UTC|newest] Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-09-15 14:54 [PATCH v3 00/22] client-side NFS/RDMA patches ready for v4.9 Chuck Lever 2016-09-15 14:54 ` Chuck Lever [not found] ` <20160915143440.11080.89241.stgit-FYjufvaPoItvLzlybtyyYzGyq/o6K9yX@public.gmane.org> 2016-09-15 14:55 ` [PATCH v3 01/22] xprtrdma: Eliminate INLINE_THRESHOLD macros Chuck Lever 2016-09-15 14:55 ` Chuck Lever 2016-09-15 14:55 ` [PATCH v3 02/22] SUNRPC: Refactor rpc_xdr_buf_init() Chuck Lever 2016-09-15 14:55 ` Chuck Lever 2016-09-15 14:55 ` [PATCH v3 03/22] SUNRPC: Generalize the RPC buffer allocation API Chuck Lever 2016-09-15 14:55 ` Chuck Lever 2016-09-15 14:55 ` [PATCH v3 04/22] SUNRPC: Generalize the RPC buffer release API Chuck Lever 2016-09-15 14:55 ` Chuck Lever 2016-09-15 14:55 ` Chuck Lever [this message] 2016-09-15 14:55 ` [PATCH v3 05/22] SUNRPC: Separate buffer pointers for RPC Call and Reply messages Chuck Lever 2016-09-15 14:55 ` [PATCH v3 06/22] SUNRPC: Add a transport-specific private field in rpc_rqst Chuck Lever 2016-09-15 14:55 ` Chuck Lever 2016-09-15 14:55 ` [PATCH v3 07/22] xprtrdma: Initialize separate RPC call and reply buffers Chuck Lever 2016-09-15 14:55 ` Chuck Lever 2016-09-15 14:56 ` [PATCH v3 08/22] xprtrdma: Use smaller buffers for RPC-over-RDMA headers Chuck Lever 2016-09-15 14:56 ` Chuck Lever 2016-09-15 14:56 ` [PATCH v3 09/22] xprtrdma: Replace DMA_BIDIRECTIONAL Chuck Lever 2016-09-15 14:56 ` Chuck Lever 2016-09-15 14:56 ` [PATCH v3 10/22] xprtrdma: Delay DMA mapping Send and Receive buffers Chuck Lever 2016-09-15 14:56 ` Chuck Lever 2016-09-15 14:56 ` [PATCH v3 11/22] xprtrdma: Eliminate "ia" argument in rpcrdma_{alloc, free}_regbuf Chuck Lever 2016-09-15 14:56 ` Chuck Lever 2016-09-15 14:56 ` [PATCH v3 12/22] xprtrdma: Simplify rpcrdma_ep_post_recv() Chuck Lever 2016-09-15 14:56 ` Chuck Lever 2016-09-15 14:56 ` [PATCH v3 13/22] xprtrdma: Move send_wr to struct rpcrdma_req Chuck Lever 2016-09-15 14:56 ` Chuck Lever 2016-09-15 14:56 ` [PATCH v3 14/22] xprtrdma: Move recv_wr to struct rpcrdma_rep Chuck Lever 2016-09-15 14:56 ` Chuck Lever 2016-09-15 14:56 ` [PATCH v3 15/22] rpcrdma: RDMA/CM private message data structure Chuck Lever 2016-09-15 14:56 ` Chuck Lever 2016-09-15 14:57 ` [PATCH v3 16/22] xprtrdma: Client-side support for rpcrdma_connect_private Chuck Lever 2016-09-15 14:57 ` Chuck Lever 2016-09-15 14:57 ` [PATCH v3 17/22] xprtrdma: Basic support for Remote Invalidation Chuck Lever 2016-09-15 14:57 ` Chuck Lever 2016-09-15 14:57 ` [PATCH v3 18/22] xprtrdma: Use gathered Send for large inline messages Chuck Lever 2016-09-15 14:57 ` Chuck Lever 2016-09-15 14:57 ` [PATCH v3 19/22] xprtrdma: Support larger inline thresholds Chuck Lever 2016-09-15 14:57 ` Chuck Lever 2016-09-15 14:57 ` [PATCH v3 20/22] xprtrmda: Report address of frmr, not mw Chuck Lever 2016-09-15 14:57 ` Chuck Lever 2016-09-15 14:57 ` [PATCH v3 21/22] xprtrdma: Rename rpcrdma_receive_wc() Chuck Lever 2016-09-15 14:57 ` Chuck Lever 2016-09-15 14:57 ` [PATCH v3 22/22] xprtrdma: Eliminate rpcrdma_receive_worker() Chuck Lever 2016-09-15 14:57 ` Chuck Lever
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