diff options
Diffstat (limited to 'net/sunrpc/xprtrdma')
| -rw-r--r-- | net/sunrpc/xprtrdma/backchannel.c | 2 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/fmr_ops.c | 3 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/frwr_ops.c | 2 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/module.c | 4 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/rpc_rdma.c | 7 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma.c | 3 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_backchannel.c | 54 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 439 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_rw.c | 133 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_sendto.c | 510 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_transport.c | 481 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/transport.c | 4 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/verbs.c | 1 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/xprt_rdma.h | 2 |
14 files changed, 827 insertions, 818 deletions
diff --git a/net/sunrpc/xprtrdma/backchannel.c b/net/sunrpc/xprtrdma/backchannel.c index 47ebac949769..dbedc872ec10 100644 --- a/net/sunrpc/xprtrdma/backchannel.c +++ b/net/sunrpc/xprtrdma/backchannel.c @@ -9,8 +9,10 @@ #include <linux/sunrpc/xprt.h> #include <linux/sunrpc/svc.h> #include <linux/sunrpc/svc_xprt.h> +#include <linux/sunrpc/svc_rdma.h> #include "xprt_rdma.h" +#include <trace/events/rpcrdma.h> #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) # define RPCDBG_FACILITY RPCDBG_TRANS diff --git a/net/sunrpc/xprtrdma/fmr_ops.c b/net/sunrpc/xprtrdma/fmr_ops.c index f2f63959fddd..3c8d19f6e320 100644 --- a/net/sunrpc/xprtrdma/fmr_ops.c +++ b/net/sunrpc/xprtrdma/fmr_ops.c @@ -20,7 +20,10 @@ * verb (fmr_op_unmap). */ +#include <linux/sunrpc/svc_rdma.h> + #include "xprt_rdma.h" +#include <trace/events/rpcrdma.h> #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) # define RPCDBG_FACILITY RPCDBG_TRANS diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c index c59c5c788db0..2d2fefbb810b 100644 --- a/net/sunrpc/xprtrdma/frwr_ops.c +++ b/net/sunrpc/xprtrdma/frwr_ops.c @@ -71,8 +71,10 @@ */ #include <linux/sunrpc/rpc_rdma.h> +#include <linux/sunrpc/svc_rdma.h> #include "xprt_rdma.h" +#include <trace/events/rpcrdma.h> #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) # define RPCDBG_FACILITY RPCDBG_TRANS diff --git a/net/sunrpc/xprtrdma/module.c b/net/sunrpc/xprtrdma/module.c index a762d192372b..d95ac0736b7f 100644 --- a/net/sunrpc/xprtrdma/module.c +++ b/net/sunrpc/xprtrdma/module.c @@ -13,9 +13,11 @@ #include <asm/swab.h> -#define CREATE_TRACE_POINTS #include "xprt_rdma.h" +#define CREATE_TRACE_POINTS +#include <trace/events/rpcrdma.h> + MODULE_AUTHOR("Open Grid Computing and Network Appliance, Inc."); MODULE_DESCRIPTION("RPC/RDMA Transport"); MODULE_LICENSE("Dual BSD/GPL"); diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c index e8adad33d0bb..b942d7e0aef5 100644 --- a/net/sunrpc/xprtrdma/rpc_rdma.c +++ b/net/sunrpc/xprtrdma/rpc_rdma.c @@ -46,10 +46,13 @@ * to the Linux RPC framework lives. */ -#include "xprt_rdma.h" - #include <linux/highmem.h> +#include <linux/sunrpc/svc_rdma.h> + +#include "xprt_rdma.h" +#include <trace/events/rpcrdma.h> + #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) # define RPCDBG_FACILITY RPCDBG_TRANS #endif diff --git a/net/sunrpc/xprtrdma/svc_rdma.c b/net/sunrpc/xprtrdma/svc_rdma.c index dd8a431dc2ae..357ba90c382d 100644 --- a/net/sunrpc/xprtrdma/svc_rdma.c +++ b/net/sunrpc/xprtrdma/svc_rdma.c @@ -1,4 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause /* + * Copyright (c) 2015-2018 Oracle. All rights reserved. * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved. * * This software is available to you under a choice of one of two @@ -46,7 +48,6 @@ #include <linux/sunrpc/clnt.h> #include <linux/sunrpc/sched.h> #include <linux/sunrpc/svc_rdma.h> -#include "xprt_rdma.h" #define RPCDBG_FACILITY RPCDBG_SVCXPRT diff --git a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c index a73632ca9048..343e7add672c 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c +++ b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c @@ -1,13 +1,16 @@ // SPDX-License-Identifier: GPL-2.0 /* - * Copyright (c) 2015 Oracle. All rights reserved. + * Copyright (c) 2015-2018 Oracle. All rights reserved. * * Support for backward direction RPCs on RPC/RDMA (server-side). */ #include <linux/module.h> + #include <linux/sunrpc/svc_rdma.h> + #include "xprt_rdma.h" +#include <trace/events/rpcrdma.h> #define RPCDBG_FACILITY RPCDBG_SVCXPRT @@ -112,39 +115,21 @@ out_notfound: * the adapter has a small maximum SQ depth. */ static int svc_rdma_bc_sendto(struct svcxprt_rdma *rdma, - struct rpc_rqst *rqst) + struct rpc_rqst *rqst, + struct svc_rdma_send_ctxt *ctxt) { - struct svc_rdma_op_ctxt *ctxt; int ret; - ctxt = svc_rdma_get_context(rdma); - - /* rpcrdma_bc_send_request builds the transport header and - * the backchannel RPC message in the same buffer. Thus only - * one SGE is needed to send both. - */ - ret = svc_rdma_map_reply_hdr(rdma, ctxt, rqst->rq_buffer, - rqst->rq_snd_buf.len); + ret = svc_rdma_map_reply_msg(rdma, ctxt, &rqst->rq_snd_buf, NULL); if (ret < 0) - goto out_err; + return -EIO; /* Bump page refcnt so Send completion doesn't release * the rq_buffer before all retransmits are complete. */ get_page(virt_to_page(rqst->rq_buffer)); - ret = svc_rdma_post_send_wr(rdma, ctxt, 1, 0); - if (ret) - goto out_unmap; - -out_err: - dprintk("svcrdma: %s returns %d\n", __func__, ret); - return ret; - -out_unmap: - svc_rdma_unmap_dma(ctxt); - svc_rdma_put_context(ctxt, 1); - ret = -EIO; - goto out_err; + ctxt->sc_send_wr.opcode = IB_WR_SEND; + return svc_rdma_send(rdma, &ctxt->sc_send_wr); } /* Server-side transport endpoint wants a whole page for its send @@ -191,13 +176,15 @@ rpcrdma_bc_send_request(struct svcxprt_rdma *rdma, struct rpc_rqst *rqst) { struct rpc_xprt *xprt = rqst->rq_xprt; struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); + struct svc_rdma_send_ctxt *ctxt; __be32 *p; int rc; - /* Space in the send buffer for an RPC/RDMA header is reserved - * via xprt->tsh_size. - */ - p = rqst->rq_buffer; + ctxt = svc_rdma_send_ctxt_get(rdma); + if (!ctxt) + goto drop_connection; + + p = ctxt->sc_xprt_buf; *p++ = rqst->rq_xid; *p++ = rpcrdma_version; *p++ = cpu_to_be32(r_xprt->rx_buf.rb_bc_max_requests); @@ -205,14 +192,17 @@ rpcrdma_bc_send_request(struct svcxprt_rdma *rdma, struct rpc_rqst *rqst) *p++ = xdr_zero; *p++ = xdr_zero; *p = xdr_zero; + svc_rdma_sync_reply_hdr(rdma, ctxt, RPCRDMA_HDRLEN_MIN); #ifdef SVCRDMA_BACKCHANNEL_DEBUG pr_info("%s: %*ph\n", __func__, 64, rqst->rq_buffer); #endif - rc = svc_rdma_bc_sendto(rdma, rqst); - if (rc) + rc = svc_rdma_bc_sendto(rdma, rqst, ctxt); + if (rc) { + svc_rdma_send_ctxt_put(rdma, ctxt); goto drop_connection; + } return rc; drop_connection: @@ -320,7 +310,7 @@ xprt_setup_rdma_bc(struct xprt_create *args) xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO; xprt->prot = XPRT_TRANSPORT_BC_RDMA; - xprt->tsh_size = RPCRDMA_HDRLEN_MIN / sizeof(__be32); + xprt->tsh_size = 0; xprt->ops = &xprt_rdma_bc_procs; memcpy(&xprt->addr, args->dstaddr, args->addrlen); diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c index 3d45015dca97..841fca143804 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c +++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c @@ -1,5 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause /* - * Copyright (c) 2016, 2017 Oracle. All rights reserved. + * Copyright (c) 2016-2018 Oracle. All rights reserved. * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved. * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved. * @@ -60,7 +61,7 @@ * svc_rdma_recvfrom must post RDMA Reads to pull the RPC Call's * data payload from the client. svc_rdma_recvfrom sets up the * RDMA Reads using pages in svc_rqst::rq_pages, which are - * transferred to an svc_rdma_op_ctxt for the duration of the + * transferred to an svc_rdma_recv_ctxt for the duration of the * I/O. svc_rdma_recvfrom then returns zero, since the RPC message * is still not yet ready. * @@ -69,18 +70,18 @@ * svc_rdma_recvfrom again. This second call may use a different * svc_rqst than the first one, thus any information that needs * to be preserved across these two calls is kept in an - * svc_rdma_op_ctxt. + * svc_rdma_recv_ctxt. * * The second call to svc_rdma_recvfrom performs final assembly * of the RPC Call message, using the RDMA Read sink pages kept in - * the svc_rdma_op_ctxt. The xdr_buf is copied from the - * svc_rdma_op_ctxt to the second svc_rqst. The second call returns + * the svc_rdma_recv_ctxt. The xdr_buf is copied from the + * svc_rdma_recv_ctxt to the second svc_rqst. The second call returns * the length of the completed RPC Call message. * * Page Management * * Pages under I/O must be transferred from the first svc_rqst to an - * svc_rdma_op_ctxt before the first svc_rdma_recvfrom call returns. + * svc_rdma_recv_ctxt before the first svc_rdma_recvfrom call returns. * * The first svc_rqst supplies pages for RDMA Reads. These are moved * from rqstp::rq_pages into ctxt::pages. The consumed elements of @@ -88,78 +89,286 @@ * svc_rdma_recvfrom call returns. * * During the second svc_rdma_recvfrom call, RDMA Read sink pages - * are transferred from the svc_rdma_op_ctxt to the second svc_rqst + * are transferred from the svc_rdma_recv_ctxt to the second svc_rqst * (see rdma_read_complete() below). */ +#include <linux/spinlock.h> #include <asm/unaligned.h> #include <rdma/ib_verbs.h> #include <rdma/rdma_cm.h> -#include <linux/spinlock.h> - #include <linux/sunrpc/xdr.h> #include <linux/sunrpc/debug.h> #include <linux/sunrpc/rpc_rdma.h> #include <linux/sunrpc/svc_rdma.h> +#include "xprt_rdma.h" +#include <trace/events/rpcrdma.h> + #define RPCDBG_FACILITY RPCDBG_SVCXPRT -/* - * Replace the pages in the rq_argpages array with the pages from the SGE in - * the RDMA_RECV completion. The SGL should contain full pages up until the - * last one. +static void svc_rdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc); + +static inline struct svc_rdma_recv_ctxt * +svc_rdma_next_recv_ctxt(struct list_head *list) +{ + return list_first_entry_or_null(list, struct svc_rdma_recv_ctxt, + rc_list); +} + +static struct svc_rdma_recv_ctxt * +svc_rdma_recv_ctxt_alloc(struct svcxprt_rdma *rdma) +{ + struct svc_rdma_recv_ctxt *ctxt; + dma_addr_t addr; + void *buffer; + + ctxt = kmalloc(sizeof(*ctxt), GFP_KERNEL); + if (!ctxt) + goto fail0; + buffer = kmalloc(rdma->sc_max_req_size, GFP_KERNEL); + if (!buffer) + goto fail1; + addr = ib_dma_map_single(rdma->sc_pd->device, buffer, + rdma->sc_max_req_size, DMA_FROM_DEVICE); + if (ib_dma_mapping_error(rdma->sc_pd->device, addr)) + goto fail2; + + ctxt->rc_recv_wr.next = NULL; + ctxt->rc_recv_wr.wr_cqe = &ctxt->rc_cqe; + ctxt->rc_recv_wr.sg_list = &ctxt->rc_recv_sge; + ctxt->rc_recv_wr.num_sge = 1; + ctxt->rc_cqe.done = svc_rdma_wc_receive; + ctxt->rc_recv_sge.addr = addr; + ctxt->rc_recv_sge.length = rdma->sc_max_req_size; + ctxt->rc_recv_sge.lkey = rdma->sc_pd->local_dma_lkey; + ctxt->rc_recv_buf = buffer; + ctxt->rc_temp = false; + return ctxt; + +fail2: + kfree(buffer); +fail1: + kfree(ctxt); +fail0: + return NULL; +} + +static void svc_rdma_recv_ctxt_destroy(struct svcxprt_rdma *rdma, + struct svc_rdma_recv_ctxt *ctxt) +{ + ib_dma_unmap_single(rdma->sc_pd->device, ctxt->rc_recv_sge.addr, + ctxt->rc_recv_sge.length, DMA_FROM_DEVICE); + kfree(ctxt->rc_recv_buf); + kfree(ctxt); +} + +/** + * svc_rdma_recv_ctxts_destroy - Release all recv_ctxt's for an xprt + * @rdma: svcxprt_rdma being torn down + * */ -static void svc_rdma_build_arg_xdr(struct svc_rqst *rqstp, - struct svc_rdma_op_ctxt *ctxt) +void svc_rdma_recv_ctxts_destroy(struct svcxprt_rdma *rdma) { - struct page *page; - int sge_no; - u32 len; + struct svc_rdma_recv_ctxt *ctxt; - /* The reply path assumes the Call's transport header resides - * in rqstp->rq_pages[0]. - */ - page = ctxt->pages[0]; - put_page(rqstp->rq_pages[0]); - rqstp->rq_pages[0] = page; - - /* Set up the XDR head */ - rqstp->rq_arg.head[0].iov_base = page_address(page); - rqstp->rq_arg.head[0].iov_len = - min_t(size_t, ctxt->byte_len, ctxt->sge[0].length); - rqstp->rq_arg.len = ctxt->byte_len; - rqstp->rq_arg.buflen = ctxt->byte_len; - - /* Compute bytes past head in the SGL */ - len = ctxt->byte_len - rqstp->rq_arg.head[0].iov_len; - - /* If data remains, store it in the pagelist */ - rqstp->rq_arg.page_len = len; - rqstp->rq_arg.page_base = 0; - - sge_no = 1; - while (len && sge_no < ctxt->count) { - page = ctxt->pages[sge_no]; - put_page(rqstp->rq_pages[sge_no]); - rqstp->rq_pages[sge_no] = page; - len -= min_t(u32, len, ctxt->sge[sge_no].length); - sge_no++; + while ((ctxt = svc_rdma_next_recv_ctxt(&rdma->sc_recv_ctxts))) { + list_del(&ctxt->rc_list); + svc_rdma_recv_ctxt_destroy(rdma, ctxt); } - rqstp->rq_respages = &rqstp->rq_pages[sge_no]; - rqstp->rq_next_page = rqstp->rq_respages + 1; +} + +static struct svc_rdma_recv_ctxt * +svc_rdma_recv_ctxt_get(struct svcxprt_rdma *rdma) +{ + struct svc_rdma_recv_ctxt *ctxt; + + spin_lock(&rdma->sc_recv_lock); + ctxt = svc_rdma_next_recv_ctxt(&rdma->sc_recv_ctxts); + if (!ctxt) + goto out_empty; + list_del(&ctxt->rc_list); + spin_unlock(&rdma->sc_recv_lock); + +out: + ctxt->rc_page_count = 0; + return ctxt; + +out_empty: + spin_unlock(&rdma->sc_recv_lock); + + ctxt = svc_rdma_recv_ctxt_alloc(rdma); + if (!ctxt) + return NULL; + goto out; +} + +/** + * svc_rdma_recv_ctxt_put - Return recv_ctxt to free list + * @rdma: controlling svcxprt_rdma + * @ctxt: object to return to the free list + * + */ +void svc_rdma_recv_ctxt_put(struct svcxprt_rdma *rdma, + struct svc_rdma_recv_ctxt *ctxt) +{ + unsigned int i; + + for (i = 0; i < ctxt->rc_page_count; i++) + put_page(ctxt->rc_pages[i]); + + if (!ctxt->rc_temp) { + spin_lock(&rdma->sc_recv_lock); + list_add(&ctxt->rc_list, &rdma->sc_recv_ctxts); + spin_unlock(&rdma->sc_recv_lock); + } else + svc_rdma_recv_ctxt_destroy(rdma, ctxt); +} + +static int __svc_rdma_post_recv(struct svcxprt_rdma *rdma, + struct svc_rdma_recv_ctxt *ctxt) +{ + struct ib_recv_wr *bad_recv_wr; + int ret; + + svc_xprt_get(&rdma->sc_xprt); + ret = ib_post_recv(rdma->sc_qp, &ctxt->rc_recv_wr, &bad_recv_wr); + trace_svcrdma_post_recv(&ctxt->rc_recv_wr, ret); + if (ret) + goto err_post; + return 0; + +err_post: + svc_rdma_recv_ctxt_put(rdma, ctxt); + svc_xprt_put(&rdma->sc_xprt); + return ret; +} - /* If not all pages were used from the SGL, free the remaining ones */ - len = sge_no; - while (sge_no < ctxt->count) { - page = ctxt->pages[sge_no++]; - put_page(page); +static int svc_rdma_post_recv(struct svcxprt_rdma *rdma) +{ + struct svc_rdma_recv_ctxt *ctxt; + + ctxt = svc_rdma_recv_ctxt_get(rdma); + if (!ctxt) + return -ENOMEM; + return __svc_rdma_post_recv(rdma, ctxt); +} + +/** + * svc_rdma_post_recvs - Post initial set of Recv WRs + * @rdma: fresh svcxprt_rdma + * + * Returns true if successful, otherwise false. + */ +bool svc_rdma_post_recvs(struct svcxprt_rdma *rdma) +{ + struct svc_rdma_recv_ctxt *ctxt; + unsigned int i; + int ret; + + for (i = 0; i < rdma->sc_max_requests; i++) { + ctxt = svc_rdma_recv_ctxt_get(rdma); + if (!ctxt) + return false; + ctxt->rc_temp = true; + ret = __svc_rdma_post_recv(rdma, ctxt); + if (ret) { + pr_err("svcrdma: failure posting recv buffers: %d\n", + ret); + return false; + } } - ctxt->count = len; + return true; +} - /* Set up tail */ - rqstp->rq_arg.tail[0].iov_base = NULL; - rqstp->rq_arg.tail[0].iov_len = 0; +/** + * svc_rdma_wc_receive - Invoked by RDMA provider for each polled Receive WC + * @cq: Completion Queue context + * @wc: Work Completion object + * + * NB: The svc_xprt/svcxprt_rdma is pinned whenever it's possible that + * the Receive completion handler could be running. + */ +static void svc_rdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc) +{ + struct svcxprt_rdma *rdma = cq->cq_context; + struct ib_cqe *cqe = wc->wr_cqe; + struct svc_rdma_recv_ctxt *ctxt; + + trace_svcrdma_wc_receive(wc); + + /* WARNING: Only wc->wr_cqe and wc->status are reliable */ + ctxt = container_of(cqe, struct svc_rdma_recv_ctxt, rc_cqe); + + if (wc->status != IB_WC_SUCCESS) + goto flushed; + + if (svc_rdma_post_recv(rdma)) + goto post_err; + + /* All wc fields are now known to be valid */ + ctxt->rc_byte_len = wc->byte_len; + ib_dma_sync_single_for_cpu(rdma->sc_pd->device, + ctxt->rc_recv_sge.addr, + wc->byte_len, DMA_FROM_DEVICE); + + spin_lock(&rdma->sc_rq_dto_lock); + list_add_tail(&ctxt->rc_list, &rdma->sc_rq_dto_q); + spin_unlock(&rdma->sc_rq_dto_lock); + set_bit(XPT_DATA, &rdma->sc_xprt.xpt_flags); + if (!test_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags)) + svc_xprt_enqueue(&rdma->sc_xprt); + goto out; + +flushed: + if (wc->status != IB_WC_WR_FLUSH_ERR) + pr_err("svcrdma: Recv: %s (%u/0x%x)\n", + ib_wc_status_msg(wc->status), + wc->status, wc->vendor_err); +post_err: + svc_rdma_recv_ctxt_put(rdma, ctxt); + set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags); + svc_xprt_enqueue(&rdma->sc_xprt); +out: + svc_xprt_put(&rdma->sc_xprt); +} + +/** + * svc_rdma_flush_recv_queues - Drain pending Receive work + * @rdma: svcxprt_rdma being shut down + * + */ +void svc_rdma_flush_recv_queues(struct svcxprt_rdma *rdma) +{ + struct svc_rdma_recv_ctxt *ctxt; + + while ((ctxt = svc_rdma_next_recv_ctxt(&rdma->sc_read_complete_q))) { + list_del(&ctxt->rc_list); + svc_rdma_recv_ctxt_put(rdma, ctxt); + } + while ((ctxt = svc_rdma_next_recv_ctxt(&rdma->sc_rq_dto_q))) { + list_del(&ctxt->rc_list); + svc_rdma_recv_ctxt_put(rdma, ctxt); + } +} + +static void svc_rdma_build_arg_xdr(struct svc_rqst *rqstp, + struct svc_rdma_recv_ctxt *ctxt) +{ + struct xdr_buf *arg = &rqstp->rq_arg; + + arg->head[0].iov_base = ctxt->rc_recv_buf; + arg->head[0].iov_len = ctxt->rc_byte_len; + arg->tail[0].iov_base = NULL; + arg->tail[0].iov_len = 0; + arg->page_len = 0; + arg->page_base = 0; + arg->buflen = ctxt->rc_byte_len; + arg->len = ctxt->rc_byte_len; + + rqstp->rq_respages = &rqstp->rq_pages[0]; + rqstp->rq_next_page = rqstp->rq_respages + 1; } /* This accommodates the largest possible Write chunk, @@ -294,7 +503,6 @@ static int svc_rdma_xdr_decode_req(struct xdr_buf *rq_arg) { __be32 *p, *end, *rdma_argp; unsigned int hdr_len; - char *proc; /* Verify that there's enough bytes for header + something */ if (rq_arg->len <= RPCRDMA_HDRLEN_ERR) @@ -306,10 +514,8 @@ static int svc_rdma_xdr_decode_req(struct xdr_buf *rq_arg) switch (*(rdma_argp + 3)) { case rdma_msg: - proc = "RDMA_MSG"; break; case rdma_nomsg: - proc = "RDMA_NOMSG"; break; case rdma_done: @@ -339,103 +545,94 @@ static int svc_rdma_xdr_decode_req(struct xdr_buf *rq_arg) hdr_len = (unsigned long)p - (unsigned long)rdma_argp; rq_arg->head[0].iov_len -= hdr_len; rq_arg->len -= hdr_len; - dprintk("svcrdma: received %s request for XID 0x%08x, hdr_len=%u\n", - proc, be32_to_cpup(rdma_argp), hdr_len); + trace_svcrdma_decode_rqst(rdma_argp, hdr_len); return hdr_len; out_short: - dprintk("svcrdma: header too short = %d\n", rq_arg->len); + trace_svcrdma_decode_short(rq_arg->len); return -EINVAL; out_version: - dprintk("svcrdma: bad xprt version: %u\n", - be32_to_cpup(rdma_argp + 1)); + trace_svcrdma_decode_badvers(rdma_argp); return -EPROTONOSUPPORT; out_drop: - dprintk("svcrdma: dropping RDMA_DONE/ERROR message\n"); + trace_svcrdma_decode_drop(rdma_argp); return 0; out_proc: - dprintk("svcrdma: bad rdma procedure (%u)\n", - be32_to_cpup(rdma_argp + 3)); + trace_svcrdma_decode_badproc(rdma_argp); return -EINVAL; out_inval: - dprintk("svcrdma: failed to parse transport header\n"); + trace_svcrdma_decode_parse(rdma_argp); return -EINVAL; } static void rdma_read_complete(struct svc_rqst *rqstp, - struct svc_rdma_op_ctxt *head) + struct svc_rdma_recv_ctxt *head) { int page_no; - /* Copy RPC pages */ - for (page_no = 0; page_no < head->count; page_no++) { + /* Move Read chunk pages to rqstp so that they will be released + * when svc_process is done with them. + */ + for (page_no = 0; page_no < head->rc_page_count; page_no++) { put_page(rqstp->rq_pages[page_no]); - rqstp->rq_pages[page_no] = head->pages[page_no]; + rqstp->rq_pages[page_no] = head->rc_pages[page_no]; } + head->rc_page_count = 0; /* Point rq_arg.pages past header */ - rqstp->rq_arg.pages = &rqstp->rq_pages[head->hdr_count]; - rqstp->rq_arg.page_len = head->arg.page_len; + rqstp->rq_arg.pages = &rqstp->rq_pages[head->rc_hdr_count]; + rqstp->rq_arg.page_len = head->rc_arg.page_len; /* rq_respages starts after the last arg page */ rqstp->rq_respages = &rqstp->rq_pages[page_no]; rqstp->rq_next_page = rqstp->rq_respages + 1; /* Rebuild rq_arg head and tail. */ - rqstp->rq_arg.head[0] = head->arg.head[0]; - rqstp->rq_arg.tail[0] = head->arg.tail[0]; - rqstp->rq_arg.len = head->arg.len; - rqstp->rq_arg.buflen = head->arg.buflen; + rqstp->rq_arg.head[0] = head->rc_arg.head[0]; + rqstp->rq_arg.tail[0] = head->rc_arg.tail[0]; + rqstp->rq_arg.len = head->rc_arg.len; + rqstp->rq_arg.buflen = head->rc_arg.buflen; } static void svc_rdma_send_error(struct svcxprt_rdma *xprt, __be32 *rdma_argp, int status) { - struct svc_rdma_op_ctxt *ctxt; - __be32 *p, *err_msgp; + struct svc_rdma_send_ctxt *ctxt; unsigned int length; - struct page *page; + __be32 *p; int ret; - page = alloc_page(GFP_KERNEL); - if (!page) + ctxt = svc_rdma_send_ctxt_get(xprt); + if (!ctxt) return; - err_msgp = page_address(page); - p = err_msgp; + p = ctxt->sc_xprt_buf; *p++ = *rdma_argp; *p++ = *(rdma_argp + 1); *p++ = xprt->sc_fc_credits; *p++ = rdma_error; - if (status == -EPROTONOSUPPORT) { + switch (status) { + case -EPROTONOSUPPORT: *p++ = err_vers; *p++ = rpcrdma_version; *p++ = rpcrdma_version; - } else { + trace_svcrdma_err_vers(*rdma_argp); + break; + default: *p++ = err_chunk; + trace_svcrdma_err_chunk(*rdma_argp); } - length = (unsigned long)p - (unsigned long)err_msgp; - - /* Map transport header; no RPC message payload */ - ctxt = svc_rdma_get_context(xprt); - ret = svc_rdma_map_reply_hdr(xprt, ctxt, err_msgp, length); - if (ret) { - dprintk("svcrdma: Error %d mapping send for protocol error\n", - ret); - return; - } + length = (unsigned long)p - (unsigned long)ctxt->sc_xprt_buf; + svc_rdma_sync_reply_hdr(xprt, ctxt, length); - ret = svc_rdma_post_send_wr(xprt, ctxt, 1, 0); - if (ret) { - dprintk("svcrdma: Error %d posting send for protocol error\n", - ret); - svc_rdma_unmap_dma(ctxt); - svc_rdma_put_context(ctxt, 1); - } + ctxt->sc_send_wr.opcode = IB_WR_SEND; + ret = svc_rdma_send(xprt, &ctxt->sc_send_wr); + if (ret) + svc_rdma_send_ctxt_put(xprt, ctxt); } /* By convention, backchannel calls arrive via rdma_msg type @@ -507,32 +704,28 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp) struct svc_xprt *xprt = rqstp->rq_xprt; struct svcxprt_rdma *rdma_xprt = container_of(xprt, struct svcxprt_rdma, sc_xprt); - struct svc_rdma_op_ctxt *ctxt; + struct svc_rdma_recv_ctxt *ctxt; __be32 *p; int ret; spin_lock(&rdma_xprt->sc_rq_dto_lock); - if (!list_empty(&rdma_xprt->sc_read_complete_q)) { - ctxt = list_first_entry(&rdma_xprt->sc_read_complete_q, - struct svc_rdma_op_ctxt, list); - list_del(&ctxt->list); + ctxt = svc_rdma_next_recv_ctxt(&rdma_xprt->sc_read_complete_q); + if (ctxt) { + list_del(&ctxt->rc_list); spin_unlock(&rdma_xprt->sc_rq_dto_lock); rdma_read_complete(rqstp, ctxt); goto complete; - } else if (!list_empty(&rdma_xprt->sc_rq_dto_q)) { - ctxt = list_first_entry(&rdma_xprt->sc_rq_dto_q, - struct svc_rdma_op_ctxt, list); - list_del(&ctxt->list); - } else { + } + ctxt = svc_rdma_next_recv_ctxt(&rdma_xprt->sc_rq_dto_q); + if (!ctxt) { /* No new incoming requests, terminate the loop */ clear_bit(XPT_DATA, &xprt->xpt_flags); spin_unlock(&rdma_xprt->sc_rq_dto_lock); return 0; } + list_del(&ctxt->rc_list); spin_unlock(&rdma_xprt->sc_rq_dto_lock); - dprintk("svcrdma: recvfrom: ctxt=%p on xprt=%p, rqstp=%p\n", - ctxt, rdma_xprt, rqstp); atomic_inc(&rdma_stat_recv); svc_rdma_build_arg_xdr(rqstp, ctxt); @@ -548,7 +741,7 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp) if (svc_rdma_is_backchannel_reply(xprt, p)) { ret = svc_rdma_handle_bc_reply(xprt->xpt_bc_xprt, p, &rqstp->rq_arg); - svc_rdma_put_context(ctxt, 0); + svc_rdma_recv_ctxt_put(rdma_xprt, ctxt); return ret; } @@ -557,9 +750,7 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp) goto out_readchunk; complete: - svc_rdma_put_context(ctxt, 0); - dprintk("svcrdma: recvfrom: xprt=%p, rqstp=%p, rq_arg.len=%u\n", - rdma_xprt, rqstp, rqstp->rq_arg.len); + rqstp->rq_xprt_ctxt = ctxt; rqstp->rq_prot = IPPROTO_MAX; svc_xprt_copy_addrs(rqstp, xprt); return rqstp->rq_arg.len; @@ -572,16 +763,16 @@ out_readchunk: out_err: svc_rdma_send_error(rdma_xprt, p, ret); - svc_rdma_put_context(ctxt, 0); + svc_rdma_recv_ctxt_put(rdma_xprt, ctxt); return 0; out_postfail: if (ret == -EINVAL) svc_rdma_send_error(rdma_xprt, p, ret); - svc_rdma_put_context(ctxt, 1); + svc_rdma_recv_ctxt_put(rdma_xprt, ctxt); return ret; out_drop: - svc_rdma_put_context(ctxt, 1); + svc_rdma_recv_ctxt_put(rdma_xprt, ctxt); return 0; } diff --git a/net/sunrpc/xprtrdma/svc_rdma_rw.c b/net/sunrpc/xprtrdma/svc_rdma_rw.c index 12b9a7e0b6d2..ce3ea8419704 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_rw.c +++ b/net/sunrpc/xprtrdma/svc_rdma_rw.c @@ -1,15 +1,18 @@ // SPDX-License-Identifier: GPL-2.0 /* - * Copyright (c) 2016 Oracle. All rights reserved. + * Copyright (c) 2016-2018 Oracle. All rights reserved. * * Use the core R/W API to move RPC-over-RDMA Read and Write chunks. */ +#include <rdma/rw.h> + #include <linux/sunrpc/rpc_rdma.h> #include <linux/sunrpc/svc_rdma.h> #include <linux/sunrpc/debug.h> -#include <rdma/rw.h> +#include "xprt_rdma.h" +#include <trace/events/rpcrdma.h> #define RPCDBG_FACILITY RPCDBG_SVCXPRT @@ -205,6 +208,8 @@ static void svc_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc) struct svc_rdma_write_info *info = container_of(cc, struct svc_rdma_write_info, wi_cc); + trace_svcrdma_wc_write(wc); + atomic_add(cc->cc_sqecount, &rdma->sc_sq_avail); wake_up(&rdma->sc_send_wait); @@ -222,7 +227,7 @@ static void svc_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc) /* State for pulling a Read chunk. */ struct svc_rdma_read_info { - struct svc_rdma_op_ctxt *ri_readctxt; + struct svc_rdma_recv_ctxt *ri_readctxt; unsigned int ri_position; unsigned int ri_pageno; unsigned int ri_pageoff; @@ -266,6 +271,8 @@ static void svc_rdma_wc_read_done(struct ib_cq *cq, struct ib_wc *wc) struct svc_rdma_read_info *info = container_of(cc, struct svc_rdma_read_info, ri_cc); + trace_svcrdma_wc_read(wc); + atomic_add(cc->cc_sqecount, &rdma->sc_sq_avail); wake_up(&rdma->sc_send_wait); @@ -275,10 +282,10 @@ static void svc_rdma_wc_read_done(struct ib_cq *cq, struct ib_wc *wc) pr_err("svcrdma: read ctx: %s (%u/0x%x)\n", ib_wc_status_msg(wc->status), wc->status, wc->vendor_err); - svc_rdma_put_context(info->ri_readctxt, 1); + svc_rdma_recv_ctxt_put(rdma, info->ri_readctxt); } else { spin_lock(&rdma->sc_rq_dto_lock); - list_add_tail(&info->ri_readctxt->list, + list_add_tail(&info->ri_readctxt->rc_list, &rdma->sc_read_complete_q); spin_unlock(&rdma->sc_rq_dto_lock); @@ -323,18 +330,20 @@ static int svc_rdma_post_chunk_ctxt(struct svc_rdma_chunk_ctxt *cc) if (atomic_sub_return(cc->cc_sqecount, &rdma->sc_sq_avail) > 0) { ret = ib_post_send(rdma->sc_qp, first_wr, &bad_wr); + trace_svcrdma_post_rw(&cc->cc_cqe, + cc->cc_sqecount, ret); if (ret) break; return 0; } - atomic_inc(&rdma_stat_sq_starve); + trace_svcrdma_sq_full(rdma); atomic_add(cc->cc_sqecount, &rdma->sc_sq_avail); wait_event(rdma->sc_send_wait, atomic_read(&rdma->sc_sq_avail) > cc->cc_sqecount); + trace_svcrdma_sq_retry(rdma); } while (1); - pr_err("svcrdma: ib_post_send failed (%d)\n", ret); set_bit(XPT_CLOSE, &xprt->xpt_flags); /* If even one was posted, there will be a completion. */ @@ -437,6 +446,7 @@ svc_rdma_build_writes(struct svc_rdma_write_info *info, if (ret < 0) goto out_initerr; + trace_svcrdma_encode_wseg(seg_handle, write_len, seg_offset); list_add(&ctxt->rw_list, &cc->cc_rwctxts); cc->cc_sqecount += ret; if (write_len == seg_length - info->wi_seg_off) { @@ -462,7 +472,7 @@ out_noctx: out_initerr: svc_rdma_put_rw_ctxt(rdma, ctxt); - pr_err("svcrdma: failed to map pagelist (%d)\n", ret); + trace_svcrdma_dma_map_rwctx(rdma, ret); return -EIO; } @@ -526,6 +536,8 @@ int svc_rdma_send_write_chunk(struct svcxprt_rdma *rdma, __be32 *wr_ch, ret = svc_rdma_post_chunk_ctxt(&info->wi_cc); if (ret < 0) goto out_err; + + trace_svcrdma_encode_write(xdr->page_len); return xdr->page_len; out_err: @@ -582,6 +594,8 @@ int svc_rdma_send_reply_chunk(struct svcxprt_rdma *rdma, __be32 *rp_ch, ret = svc_rdma_post_chunk_ctxt(&info->wi_cc); if (ret < 0) goto out_err; + + trace_svcrdma_encode_reply(consumed); return consumed; out_err: @@ -593,7 +607,7 @@ static int svc_rdma_build_read_segment(struct svc_rdma_read_info *info, struct svc_rqst *rqstp, u32 rkey, u32 len, u64 offset) { - struct svc_rdma_op_ctxt *head = info->ri_readctxt; + struct svc_rdma_recv_ctxt *head = info->ri_readctxt; struct svc_rdma_chunk_ctxt *cc = &info->ri_cc; struct svc_rdma_rw_ctxt *ctxt; unsigned int sge_no, seg_len; @@ -606,18 +620,15 @@ static int svc_rdma_build_read_segment(struct svc_rdma_read_info *info, goto out_noctx; ctxt->rw_nents = sge_no; - dprintk("svcrdma: reading segment %u@0x%016llx:0x%08x (%u sges)\n", - len, offset, rkey, sge_no); - sg = ctxt->rw_sg_table.sgl; for (sge_no = 0; sge_no < ctxt->rw_nents; sge_no++) { seg_len = min_t(unsigned int, len, PAGE_SIZE - info->ri_pageoff); - head->arg.pages[info->ri_pageno] = + head->rc_arg.pages[info->ri_pageno] = rqstp->rq_pages[info->ri_pageno]; if (!info->ri_pageoff) - head->count++; + head->rc_page_count++; sg_set_page(sg, rqstp->rq_pages[info->ri_pageno], seg_len, info->ri_pageoff); @@ -656,8 +667,8 @@ out_overrun: return -EINVAL; out_initerr: + trace_svcrdma_dma_map_rwctx(cc->cc_rdma, ret); svc_rdma_put_rw_ctxt(cc->cc_rdma, ctxt); - pr_err("svcrdma: failed to map pagelist (%d)\n", ret); return -EIO; } @@ -686,6 +697,7 @@ static int svc_rdma_build_read_chunk(struct svc_rqst *rqstp, if (ret < 0) break; + trace_svcrdma_encode_rseg(rs_handle, rs_length, rs_offset); info->ri_chunklen += rs_length; } @@ -693,9 +705,9 @@ static int svc_rdma_build_read_chunk(struct svc_rqst *rqstp, } /* Construct RDMA Reads to pull over a normal Read chunk. The chunk - * data lands in the page list of head->arg.pages. + * data lands in the page list of head->rc_arg.pages. * - * Currently NFSD does not look at the head->arg.tail[0] iovec. + * Currently NFSD does not look at the head->rc_arg.tail[0] iovec. * Therefore, XDR round-up of the Read chunk and trailing * inline content must both be added at the end of the pagelist. */ @@ -703,29 +715,27 @@ static int svc_rdma_build_normal_read_chunk(struct svc_rqst *rqstp, struct svc_rdma_read_info *info, __be32 *p) { - struct svc_rdma_op_ctxt *head = info->ri_readctxt; + struct svc_rdma_recv_ctxt *head = info->ri_readctxt; int ret; - dprintk("svcrdma: Reading Read chunk at position %u\n", - info->ri_position); - - info->ri_pageno = head->hdr_count; - info->ri_pageoff = 0; - ret = svc_rdma_build_read_chunk(rqstp, info, p); if (ret < 0) goto out; + trace_svcrdma_encode_read(info->ri_chunklen, info->ri_position); + + head->rc_hdr_count = 0; + /* Split the Receive buffer between the head and tail * buffers at Read chunk's position. XDR roundup of the * chunk is not included in either the pagelist or in * the tail. */ - head->arg.tail[0].iov_base = - head->arg.head[0].iov_base + info->ri_position; - head->arg.tail[0].iov_len = - head->arg.head[0].iov_len - info->ri_position; - head->arg.head[0].iov_len = info->ri_position; + head->rc_arg.tail[0].iov_base = + head->rc_arg.head[0].iov_base + info->ri_position; + head->rc_arg.tail[0].iov_len = + head->rc_arg.head[0].iov_len - info->ri_position; + head->rc_arg.head[0].iov_len = info->ri_position; /* Read chunk may need XDR roundup (see RFC 8166, s. 3.4.5.2). * @@ -738,9 +748,9 @@ static int svc_rdma_build_normal_read_chunk(struct svc_rqst *rqstp, */ info->ri_chunklen = XDR_QUADLEN(info->ri_chunklen) << 2; - head->arg.page_len = info->ri_chunklen; - head->arg.len += info->ri_chunklen; - head->arg.buflen += info->ri_chunklen; + head->rc_arg.page_len = info->ri_chunklen; + head->rc_arg.len += info->ri_chunklen; + head->rc_arg.buflen += info->ri_chunklen; out: return ret; @@ -749,7 +759,7 @@ out: /* Construct RDMA Reads to pull over a Position Zero Read chunk. * The start of the data lands in the first page just after * the Transport header, and the rest lands in the page list of - * head->arg.pages. + * head->rc_arg.pages. * * Assumptions: * - A PZRC has an XDR-aligned length (no implicit round-up). @@ -761,35 +771,25 @@ static int svc_rdma_build_pz_read_chunk(struct svc_rqst *rqstp, struct svc_rdma_read_info *info, __be32 *p) { - struct svc_rdma_op_ctxt *head = info->ri_readctxt; + struct svc_rdma_recv_ctxt *head = info->ri_readctxt; int ret; - dprintk("svcrdma: Reading Position Zero Read chunk\n"); - - info->ri_pageno = head->hdr_count - 1; - info->ri_pageoff = offset_in_page(head->byte_len); - ret = svc_rdma_build_read_chunk(rqstp, info, p); if (ret < 0) goto out; - head->arg.len += info->ri_chunklen; - head->arg.buflen += info->ri_chunklen; + trace_svcrdma_encode_pzr(info->ri_chunklen); - if (head->arg.buflen <= head->sge[0].length) { - /* Transport header and RPC message fit entirely - * in page where head iovec resides. - */ - head->arg.head[0].iov_len = info->ri_chunklen; - } else { - /* Transport header and part of RPC message reside - * in the head iovec's page. - */ - head->arg.head[0].iov_len = - head->sge[0].length - head->byte_len; - head->arg.page_len = - info->ri_chunklen - head->arg.head[0].iov_len; - } + head->rc_arg.len += info->ri_chunklen; + head->rc_arg.buflen += info->ri_chunklen; + + head->rc_hdr_count = 1; + head->rc_arg.head[0].iov_base = page_address(head->rc_pages[0]); + head->rc_arg.head[0].iov_len = min_t(size_t, PAGE_SIZE, + info->ri_chunklen); + + head->rc_arg.page_len = info->ri_chunklen - + head->rc_arg.head[0].iov_len; out: return ret; @@ -813,29 +813,30 @@ out: * - All Read segments in @p have the same Position value. */ int svc_rdma_recv_read_chunk(struct svcxprt_rdma *rdma, struct svc_rqst *rqstp, - struct svc_rdma_op_ctxt *head, __be32 *p) + struct svc_rdma_recv_ctxt *head, __be32 *p) { struct svc_rdma_read_info *info; struct page **page; int ret; /* The request (with page list) is constructed in - * head->arg. Pages involved with RDMA Read I/O are + * head->rc_arg. Pages involved with RDMA Read I/O are * transferred there. */ - head->hdr_count = head->count; - head->arg.head[0] = rqstp->rq_arg.head[0]; - head->arg.tail[0] = rqstp->rq_arg.tail[0]; - head->arg.pages = head->pages; - head->arg.page_base = 0; - head->arg.page_len = 0; - head->arg.len = rqstp->rq_arg.len; - head->arg.buflen = rqstp->rq_arg.buflen; + head->rc_arg.head[0] = rqstp->rq_arg.head[0]; + head->rc_arg.tail[0] = rqstp->rq_arg.tail[0]; + head->rc_arg.pages = head->rc_pages; + head->rc_arg.page_base = 0; + head->rc_arg.page_len = 0; + head->rc_arg.len = rqstp->rq_arg.len; + head->rc_arg.buflen = rqstp->rq_arg.buflen; info = svc_rdma_read_info_alloc(rdma); if (!info) return -ENOMEM; info->ri_readctxt = head; + info->ri_pageno = 0; + info->ri_pageoff = 0; info->ri_position = be32_to_cpup(p + 1); if (info->ri_position) @@ -856,7 +857,7 @@ int svc_rdma_recv_read_chunk(struct svcxprt_rdma *rdma, struct svc_rqst *rqstp, out: /* Read sink pages have been moved from rqstp->rq_pages to - * head->arg.pages. Force svc_recv to refill those slots + * head->rc_arg.pages. Force svc_recv to refill those slots * in rq_pages. */ for (page = rqstp->rq_pages; page < rqstp->rq_respages; page++) diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c index 649441d5087d..4a3efaea277c 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c +++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c @@ -1,5 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause /* - * Copyright (c) 2016 Oracle. All rights reserved. + * Copyright (c) 2016-2018 Oracle. All rights reserved. * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved. * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved. * @@ -74,11 +75,11 @@ * DMA-unmap the pages under I/O for that Write segment. The Write * completion handler does not release any pages. * - * When the Send WR is constructed, it also gets its own svc_rdma_op_ctxt. + * When the Send WR is constructed, it also gets its own svc_rdma_send_ctxt. * The ownership of all of the Reply's pages are transferred into that * ctxt, the Send WR is posted, and sendto returns. * - * The svc_rdma_op_ctxt is presented when the Send WR completes. The + * The svc_rdma_send_ctxt is presented when the Send WR completes. The * Send completion handler finally releases the Reply's pages. * * This mechanism also assumes that completions on the transport's Send @@ -98,16 +99,230 @@ * where two different Write segments send portions of the same page. */ -#include <linux/sunrpc/debug.h> -#include <linux/sunrpc/rpc_rdma.h> #include <linux/spinlock.h> #include <asm/unaligned.h> + #include <rdma/ib_verbs.h> #include <rdma/rdma_cm.h> + +#include <linux/sunrpc/debug.h> +#include <linux/sunrpc/rpc_rdma.h> #include <linux/sunrpc/svc_rdma.h> +#include "xprt_rdma.h" +#include <trace/events/rpcrdma.h> + #define RPCDBG_FACILITY RPCDBG_SVCXPRT +static void svc_rdma_wc_send(struct ib_cq *cq, struct ib_wc *wc); + +static inline struct svc_rdma_send_ctxt * +svc_rdma_next_send_ctxt(struct list_head *list) +{ + return list_first_entry_or_null(list, struct svc_rdma_send_ctxt, + sc_list); +} + +static struct svc_rdma_send_ctxt * +svc_rdma_send_ctxt_alloc(struct svcxprt_rdma *rdma) +{ + struct svc_rdma_send_ctxt *ctxt; + dma_addr_t addr; + void *buffer; + size_t size; + int i; + + size = sizeof(*ctxt); + size += rdma->sc_max_send_sges * sizeof(struct ib_sge); + ctxt = kmalloc(size, GFP_KERNEL); + if (!ctxt) + goto fail0; + buffer = kmalloc(rdma->sc_max_req_size, GFP_KERNEL); + if (!buffer) + goto fail1; + addr = ib_dma_map_single(rdma->sc_pd->device, buffer, + rdma->sc_max_req_size, DMA_TO_DEVICE); + if (ib_dma_mapping_error(rdma->sc_pd->device, addr)) + goto fail2; + + ctxt->sc_send_wr.next = NULL; + ctxt->sc_send_wr.wr_cqe = &ctxt->sc_cqe; + ctxt->sc_send_wr.sg_list = ctxt->sc_sges; + ctxt->sc_send_wr.send_flags = IB_SEND_SIGNALED; + ctxt->sc_cqe.done = svc_rdma_wc_send; + ctxt->sc_xprt_buf = buffer; + ctxt->sc_sges[0].addr = addr; + + for (i = 0; i < rdma->sc_max_send_sges; i++) + ctxt->sc_sges[i].lkey = rdma->sc_pd->local_dma_lkey; + return ctxt; + +fail2: + kfree(buffer); +fail1: + kfree(ctxt); +fail0: + return NULL; +} + +/** + * svc_rdma_send_ctxts_destroy - Release all send_ctxt's for an xprt + * @rdma: svcxprt_rdma being torn down + * + */ +void svc_rdma_send_ctxts_destroy(struct svcxprt_rdma *rdma) +{ + struct svc_rdma_send_ctxt *ctxt; + + while ((ctxt = svc_rdma_next_send_ctxt(&rdma->sc_send_ctxts))) { + list_del(&ctxt->sc_list); + ib_dma_unmap_single(rdma->sc_pd->device, + ctxt->sc_sges[0].addr, + rdma->sc_max_req_size, + DMA_TO_DEVICE); + kfree(ctxt->sc_xprt_buf); + kfree(ctxt); + } +} + +/** + * svc_rdma_send_ctxt_get - Get a free send_ctxt + * @rdma: controlling svcxprt_rdma + * + * Returns a ready-to-use send_ctxt, or NULL if none are + * available and a fresh one cannot be allocated. + */ +struct svc_rdma_send_ctxt *svc_rdma_send_ctxt_get(struct svcxprt_rdma *rdma) +{ + struct svc_rdma_send_ctxt *ctxt; + + spin_lock(&rdma->sc_send_lock); + ctxt = svc_rdma_next_send_ctxt(&rdma->sc_send_ctxts); + if (!ctxt) + goto out_empty; + list_del(&ctxt->sc_list); + spin_unlock(&rdma->sc_send_lock); + +out: + ctxt->sc_send_wr.num_sge = 0; + ctxt->sc_cur_sge_no = 0; + ctxt->sc_page_count = 0; + return ctxt; + +out_empty: + spin_unlock(&rdma->sc_send_lock); + ctxt = svc_rdma_send_ctxt_alloc(rdma); + if (!ctxt) + return NULL; + goto out; +} + +/** + * svc_rdma_send_ctxt_put - Return send_ctxt to free list + * @rdma: controlling svcxprt_rdma + * @ctxt: object to return to the free list + * + * Pages left in sc_pages are DMA unmapped and released. + */ +void svc_rdma_send_ctxt_put(struct svcxprt_rdma *rdma, + struct svc_rdma_send_ctxt *ctxt) +{ + struct ib_device *device = rdma->sc_cm_id->device; + unsigned int i; + + /* The first SGE contains the transport header, which + * remains mapped until @ctxt is destroyed. + */ + for (i = 1; i < ctxt->sc_send_wr.num_sge; i++) + ib_dma_unmap_page(device, + ctxt->sc_sges[i].addr, + ctxt->sc_sges[i].length, + DMA_TO_DEVICE); + + for (i = 0; i < ctxt->sc_page_count; ++i) + put_page(ctxt->sc_pages[i]); + + spin_lock(&rdma->sc_send_lock); + list_add(&ctxt->sc_list, &rdma->sc_send_ctxts); + spin_unlock(&rdma->sc_send_lock); +} + +/** + * svc_rdma_wc_send - Invoked by RDMA provider for each polled Send WC + * @cq: Completion Queue context + * @wc: Work Completion object + * + * NB: The svc_xprt/svcxprt_rdma is pinned whenever it's possible that + * the Send completion handler could be running. + */ +static void svc_rdma_wc_send(struct ib_cq *cq, struct ib_wc *wc) +{ + struct svcxprt_rdma *rdma = cq->cq_context; + struct ib_cqe *cqe = wc->wr_cqe; + struct svc_rdma_send_ctxt *ctxt; + + trace_svcrdma_wc_send(wc); + + atomic_inc(&rdma->sc_sq_avail); + wake_up(&rdma->sc_send_wait); + + ctxt = container_of(cqe, struct svc_rdma_send_ctxt, sc_cqe); + svc_rdma_send_ctxt_put(rdma, ctxt); + + if (unlikely(wc->status != IB_WC_SUCCESS)) { + set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags); + svc_xprt_enqueue(&rdma->sc_xprt); + if (wc->status != IB_WC_WR_FLUSH_ERR) + pr_err("svcrdma: Send: %s (%u/0x%x)\n", + ib_wc_status_msg(wc->status), + wc->status, wc->vendor_err); + } + + svc_xprt_put(&rdma->sc_xprt); +} + +/** + * svc_rdma_send - Post a single Send WR + * @rdma: transport on which to post the WR + * @wr: prepared Send WR to post + * + * Returns zero the Send WR was posted successfully. Otherwise, a + * negative errno is returned. + */ +int svc_rdma_send(struct svcxprt_rdma *rdma, struct ib_send_wr *wr) +{ + struct ib_send_wr *bad_wr; + int ret; + + might_sleep(); + + /* If the SQ is full, wait until an SQ entry is available */ + while (1) { + if ((atomic_dec_return(&rdma->sc_sq_avail) < 0)) { + atomic_inc(&rdma_stat_sq_starve); + trace_svcrdma_sq_full(rdma); + atomic_inc(&rdma->sc_sq_avail); + wait_event(rdma->sc_send_wait, + atomic_read(&rdma->sc_sq_avail) > 1); + if (test_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags)) + return -ENOTCONN; + trace_svcrdma_sq_retry(rdma); + continue; + } + + svc_xprt_get(&rdma->sc_xprt); + ret = ib_post_send(rdma->sc_qp, wr, &bad_wr); + trace_svcrdma_post_send(wr, ret); + if (ret) { + set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags); + svc_xprt_put(&rdma->sc_xprt); + wake_up(&rdma->sc_send_wait); + } + break; + } + return ret; +} + static u32 xdr_padsize(u32 len) { return (len & 3) ? (4 - (len & 3)) : 0; @@ -296,41 +511,10 @@ static u32 svc_rdma_get_inv_rkey(__be32 *rdma_argp, return be32_to_cpup(p); } -/* ib_dma_map_page() is used here because svc_rdma_dma_unmap() - * is used during completion to DMA-unmap this memory, and - * it uses ib_dma_unmap_page() exclusively. - */ -static int svc_rdma_dma_map_buf(struct svcxprt_rdma *rdma, - struct svc_rdma_op_ctxt *ctxt, - unsigned int sge_no, - unsigned char *base, - unsigned int len) -{ - unsigned long offset = (unsigned long)base & ~PAGE_MASK; - struct ib_device *dev = rdma->sc_cm_id->device; - dma_addr_t dma_addr; - - dma_addr = ib_dma_map_page(dev, virt_to_page(base), - offset, len, DMA_TO_DEVICE); - if (ib_dma_mapping_error(dev, dma_addr)) - goto out_maperr; - - ctxt->sge[sge_no].addr = dma_addr; - ctxt->sge[sge_no].length = len; - ctxt->sge[sge_no].lkey = rdma->sc_pd->local_dma_lkey; - svc_rdma_count_mappings(rdma, ctxt); - return 0; - -out_maperr: - pr_err("svcrdma: failed to map buffer\n"); - return -EIO; -} - static int svc_rdma_dma_map_page(struct svcxprt_rdma *rdma, - struct svc_rdma_op_ctxt *ctxt, - unsigned int sge_no, + struct svc_rdma_send_ctxt *ctxt, struct page *page, - unsigned int offset, + unsigned long offset, unsigned int len) { struct ib_device *dev = rdma->sc_cm_id->device; @@ -340,58 +524,71 @@ static int svc_rdma_dma_map_page(struct svcxprt_rdma *rdma, if (ib_dma_mapping_error(dev, dma_addr)) goto out_maperr; - ctxt->sge[sge_no].addr = dma_addr; - ctxt->sge[sge_no].length = len; - ctxt->sge[sge_no].lkey = rdma->sc_pd->local_dma_lkey; - svc_rdma_count_mappings(rdma, ctxt); + ctxt->sc_sges[ctxt->sc_cur_sge_no].addr = dma_addr; + ctxt->sc_sges[ctxt->sc_cur_sge_no].length = len; + ctxt->sc_send_wr.num_sge++; return 0; out_maperr: - pr_err("svcrdma: failed to map page\n"); + trace_svcrdma_dma_map_page(rdma, page); return -EIO; } +/* ib_dma_map_page() is used here because svc_rdma_dma_unmap() + * handles DMA-unmap and it uses ib_dma_unmap_page() exclusively. + */ +static int svc_rdma_dma_map_buf(struct svcxprt_rdma *rdma, + struct svc_rdma_send_ctxt *ctxt, + unsigned char *base, + unsigned int len) +{ + return svc_rdma_dma_map_page(rdma, ctxt, virt_to_page(base), + offset_in_page(base), len); +} + /** - * svc_rdma_map_reply_hdr - DMA map the transport header buffer + * svc_rdma_sync_reply_hdr - DMA sync the transport header buffer * @rdma: controlling transport - * @ctxt: op_ctxt for the Send WR - * @rdma_resp: buffer containing transport header + * @ctxt: send_ctxt for the Send WR * @len: length of transport header * - * Returns: - * %0 if the header is DMA mapped, - * %-EIO if DMA mapping failed. */ -int svc_rdma_map_reply_hdr(struct svcxprt_rdma *rdma, - struct svc_rdma_op_ctxt *ctxt, - __be32 *rdma_resp, - unsigned int len) +void svc_rdma_sync_reply_hdr(struct svcxprt_rdma *rdma, + struct svc_rdma_send_ctxt *ctxt, + unsigned int len) { - ctxt->direction = DMA_TO_DEVICE; - ctxt->pages[0] = virt_to_page(rdma_resp); - ctxt->count = 1; - return svc_rdma_dma_map_page(rdma, ctxt, 0, ctxt->pages[0], 0, len); + ctxt->sc_sges[0].length = len; + ctxt->sc_send_wr.num_sge++; + ib_dma_sync_single_for_device(rdma->sc_pd->device, + ctxt->sc_sges[0].addr, len, + DMA_TO_DEVICE); } -/* Load the xdr_buf into the ctxt's sge array, and DMA map each +/* svc_rdma_map_reply_msg - Map the buffer holding RPC message + * @rdma: controlling transport + * @ctxt: send_ctxt for the Send WR + * @xdr: prepared xdr_buf containing RPC message + * @wr_lst: pointer to Call header's Write list, or NULL + * + * Load the xdr_buf into the ctxt's sge array, and DMA map each * element as it is added. * - * Returns the number of sge elements loaded on success, or - * a negative errno on failure. + * Returns zero on success, or a negative errno on failure. */ -static int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma, - struct svc_rdma_op_ctxt *ctxt, - struct xdr_buf *xdr, __be32 *wr_lst) +int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma, + struct svc_rdma_send_ctxt *ctxt, + struct xdr_buf *xdr, __be32 *wr_lst) { - unsigned int len, sge_no, remaining, page_off; + unsigned int len, remaining; + unsigned long page_off; struct page **ppages; unsigned char *base; u32 xdr_pad; int ret; - sge_no = 1; - - ret = svc_rdma_dma_map_buf(rdma, ctxt, sge_no++, + if (++ctxt->sc_cur_sge_no >= rdma->sc_max_send_sges) + return -EIO; + ret = svc_rdma_dma_map_buf(rdma, ctxt, xdr->head[0].iov_base, xdr->head[0].iov_len); if (ret < 0) @@ -421,8 +618,10 @@ static int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma, while (remaining) { len = min_t(u32, PAGE_SIZE - page_off, remaining); - ret = svc_rdma_dma_map_page(rdma, ctxt, sge_no++, - *ppages++, page_off, len); + if (++ctxt->sc_cur_sge_no >= rdma->sc_max_send_sges) + return -EIO; + ret = svc_rdma_dma_map_page(rdma, ctxt, *ppages++, + page_off, len); if (ret < 0) return ret; @@ -434,12 +633,14 @@ static int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma, len = xdr->tail[0].iov_len; tail: if (len) { - ret = svc_rdma_dma_map_buf(rdma, ctxt, sge_no++, base, len); + if (++ctxt->sc_cur_sge_no >= rdma->sc_max_send_sges) + return -EIO; + ret = svc_rdma_dma_map_buf(rdma, ctxt, base, len); if (ret < 0) return ret; } - return sge_no - 1; + return 0; } /* The svc_rqst and all resources it owns are released as soon as @@ -447,62 +648,25 @@ tail: * so they are released by the Send completion handler. */ static void svc_rdma_save_io_pages(struct svc_rqst *rqstp, - struct svc_rdma_op_ctxt *ctxt) + struct svc_rdma_send_ctxt *ctxt) { int i, pages = rqstp->rq_next_page - rqstp->rq_respages; - ctxt->count += pages; + ctxt->sc_page_count += pages; for (i = 0; i < pages; i++) { - ctxt->pages[i + 1] = rqstp->rq_respages[i]; + ctxt->sc_pages[i] = rqstp->rq_respages[i]; rqstp->rq_respages[i] = NULL; } rqstp->rq_next_page = rqstp->rq_respages + 1; } -/** - * svc_rdma_post_send_wr - Set up and post one Send Work Request - * @rdma: controlling transport - * @ctxt: op_ctxt for transmitting the Send WR - * @num_sge: number of SGEs to send - * @inv_rkey: R_key argument to Send With Invalidate, or zero - * - * Returns: - * %0 if the Send* was posted successfully, - * %-ENOTCONN if the connection was lost or dropped, - * %-EINVAL if there was a problem with the Send we built, - * %-ENOMEM if ib_post_send failed. - */ -int svc_rdma_post_send_wr(struct svcxprt_rdma *rdma, - struct svc_rdma_op_ctxt *ctxt, int num_sge, - u32 inv_rkey) -{ - struct ib_send_wr *send_wr = &ctxt->send_wr; - - dprintk("svcrdma: posting Send WR with %u sge(s)\n", num_sge); - - send_wr->next = NULL; - ctxt->cqe.done = svc_rdma_wc_send; - send_wr->wr_cqe = &ctxt->cqe; - send_wr->sg_list = ctxt->sge; - send_wr->num_sge = num_sge; - send_wr->send_flags = IB_SEND_SIGNALED; - if (inv_rkey) { - send_wr->opcode = IB_WR_SEND_WITH_INV; - send_wr->ex.invalidate_rkey = inv_rkey; - } else { - send_wr->opcode = IB_WR_SEND; - } - - return svc_rdma_send(rdma, send_wr); -} - /* Prepare the portion of the RPC Reply that will be transmitted * via RDMA Send. The RPC-over-RDMA transport header is prepared - * in sge[0], and the RPC xdr_buf is prepared in following sges. + * in sc_sges[0], and the RPC xdr_buf is prepared in following sges. * * Depending on whether a Write list or Reply chunk is present, * the server may send all, a portion of, or none of the xdr_buf. - * In the latter case, only the transport header (sge[0]) is + * In the latter case, only the transport header (sc_sges[0]) is * transmitted. * * RDMA Send is the last step of transmitting an RPC reply. Pages @@ -515,49 +679,32 @@ int svc_rdma_post_send_wr(struct svcxprt_rdma *rdma, * - The Reply's transport header will never be larger than a page. */ static int svc_rdma_send_reply_msg(struct svcxprt_rdma *rdma, - __be32 *rdma_argp, __be32 *rdma_resp, + struct svc_rdma_send_ctxt *ctxt, + __be32 *rdma_argp, struct svc_rqst *rqstp, __be32 *wr_lst, __be32 *rp_ch) { - struct svc_rdma_op_ctxt *ctxt; - u32 inv_rkey; int ret; - dprintk("svcrdma: sending %s reply: head=%zu, pagelen=%u, tail=%zu\n", - (rp_ch ? "RDMA_NOMSG" : "RDMA_MSG"), - rqstp->rq_res.head[0].iov_len, - rqstp->rq_res.page_len, - rqstp->rq_res.tail[0].iov_len); - - ctxt = svc_rdma_get_context(rdma); - - ret = svc_rdma_map_reply_hdr(rdma, ctxt, rdma_resp, - svc_rdma_reply_hdr_len(rdma_resp)); - if (ret < 0) - goto err; - if (!rp_ch) { ret = svc_rdma_map_reply_msg(rdma, ctxt, &rqstp->rq_res, wr_lst); if (ret < 0) - goto err; + return ret; } svc_rdma_save_io_pages(rqstp, ctxt); - inv_rkey = 0; - if (rdma->sc_snd_w_inv) - inv_rkey = svc_rdma_get_inv_rkey(rdma_argp, wr_lst, rp_ch); - ret = svc_rdma_post_send_wr(rdma, ctxt, 1 + ret, inv_rkey); - if (ret) - goto err; - - return 0; - -err: - svc_rdma_unmap_dma(ctxt); - svc_rdma_put_context(ctxt, 1); - return ret; + ctxt->sc_send_wr.opcode = IB_WR_SEND; + if (rdma->sc_snd_w_inv) { + ctxt->sc_send_wr.ex.invalidate_rkey = + svc_rdma_get_inv_rkey(rdma_argp, wr_lst, rp_ch); + if (ctxt->sc_send_wr.ex.invalidate_rkey) + ctxt->sc_send_wr.opcode = IB_WR_SEND_WITH_INV; + } + dprintk("svcrdma: posting Send WR with %u sge(s)\n", + ctxt->sc_send_wr.num_sge); + return svc_rdma_send(rdma, &ctxt->sc_send_wr); } /* Given the client-provided Write and Reply chunks, the server was not @@ -568,38 +715,29 @@ err: * Remote Invalidation is skipped for simplicity. */ static int svc_rdma_send_error_msg(struct svcxprt_rdma *rdma, - __be32 *rdma_resp, struct svc_rqst *rqstp) + struct svc_rdma_send_ctxt *ctxt, + struct svc_rqst *rqstp) { - struct svc_rdma_op_ctxt *ctxt; __be32 *p; int ret; - ctxt = svc_rdma_get_context(rdma); - - /* Replace the original transport header with an - * RDMA_ERROR response. XID etc are preserved. - */ - p = rdma_resp + 3; + p = ctxt->sc_xprt_buf; + trace_svcrdma_err_chunk(*p); + p += 3; *p++ = rdma_error; *p = err_chunk; - - ret = svc_rdma_map_reply_hdr(rdma, ctxt, rdma_resp, 20); - if (ret < 0) - goto err; + svc_rdma_sync_reply_hdr(rdma, ctxt, RPCRDMA_HDRLEN_ERR); svc_rdma_save_io_pages(rqstp, ctxt); - ret = svc_rdma_post_send_wr(rdma, ctxt, 1 + ret, 0); - if (ret) - goto err; + ctxt->sc_send_wr.opcode = IB_WR_SEND; + ret = svc_rdma_send(rdma, &ctxt->sc_send_wr); + if (ret) { + svc_rdma_send_ctxt_put(rdma, ctxt); + return ret; + } return 0; - -err: - pr_err("svcrdma: failed to post Send WR (%d)\n", ret); - svc_rdma_unmap_dma(ctxt); - svc_rdma_put_context(ctxt, 1); - return ret; } void svc_rdma_prep_reply_hdr(struct svc_rqst *rqstp) @@ -623,20 +761,15 @@ int svc_rdma_sendto(struct svc_rqst *rqstp) struct svc_xprt *xprt = rqstp->rq_xprt; struct svcxprt_rdma *rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); + struct svc_rdma_recv_ctxt *rctxt = rqstp->rq_xprt_ctxt; __be32 *p, *rdma_argp, *rdma_resp, *wr_lst, *rp_ch; struct xdr_buf *xdr = &rqstp->rq_res; - struct page *res_page; + struct svc_rdma_send_ctxt *sctxt; int ret; - /* Find the call's chunk lists to decide how to send the reply. - * Receive places the Call's xprt header at the start of page 0. - */ - rdma_argp = page_address(rqstp->rq_pages[0]); + rdma_argp = rctxt->rc_recv_buf; svc_rdma_get_write_arrays(rdma_argp, &wr_lst, &rp_ch); - dprintk("svcrdma: preparing response for XID 0x%08x\n", - be32_to_cpup(rdma_argp)); - /* Create the RDMA response header. xprt->xpt_mutex, * acquired in svc_send(), serializes RPC replies. The * code path below that inserts the credit grant value @@ -644,10 +777,10 @@ int svc_rdma_sendto(struct svc_rqst *rqstp) * critical section. */ ret = -ENOMEM; - res_page = alloc_page(GFP_KERNEL); - if (!res_page) + sctxt = svc_rdma_send_ctxt_get(rdma); + if (!sctxt) goto err0; - rdma_resp = page_address(res_page); + rdma_resp = sctxt->sc_xprt_buf; p = rdma_resp; *p++ = *rdma_argp; @@ -674,26 +807,33 @@ int svc_rdma_sendto(struct svc_rqst *rqstp) svc_rdma_xdr_encode_reply_chunk(rdma_resp, rp_ch, ret); } - ret = svc_rdma_send_reply_msg(rdma, rdma_argp, rdma_resp, rqstp, + svc_rdma_sync_reply_hdr(rdma, sctxt, svc_rdma_reply_hdr_len(rdma_resp)); + ret = svc_rdma_send_reply_msg(rdma, sctxt, rdma_argp, rqstp, wr_lst, rp_ch); if (ret < 0) - goto err0; - return 0; + goto err1; + ret = 0; + +out: + rqstp->rq_xprt_ctxt = NULL; + svc_rdma_recv_ctxt_put(rdma, rctxt); + return ret; err2: if (ret != -E2BIG && ret != -EINVAL) goto err1; - ret = svc_rdma_send_error_msg(rdma, rdma_resp, rqstp); + ret = svc_rdma_send_error_msg(rdma, sctxt, rqstp); if (ret < 0) - goto err0; - return 0; + goto err1; + ret = 0; + goto out; err1: - put_page(res_page); + svc_rdma_send_ctxt_put(rdma, sctxt); err0: - pr_err("svcrdma: Could not send reply, err=%d. Closing transport.\n", - ret); + trace_svcrdma_send_failed(rqstp, ret); set_bit(XPT_CLOSE, &xprt->xpt_flags); - return -ENOTCONN; + ret = -ENOTCONN; + goto out; } diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c index 96cc8f6597d3..e9535a66bab0 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_transport.c +++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c @@ -1,4 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause /* + * Copyright (c) 2015-2018 Oracle. All rights reserved. * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved. * Copyright (c) 2005-2007 Network Appliance, Inc. All rights reserved. * @@ -40,26 +42,30 @@ * Author: Tom Tucker <tom@opengridcomputing.com> */ -#include <linux/sunrpc/svc_xprt.h> -#include <linux/sunrpc/addr.h> -#include <linux/sunrpc/debug.h> -#include <linux/sunrpc/rpc_rdma.h> #include <linux/interrupt.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/workqueue.h> +#include <linux/export.h> + #include <rdma/ib_verbs.h> #include <rdma/rdma_cm.h> #include <rdma/rw.h> + +#include <linux/sunrpc/addr.h> +#include <linux/sunrpc/debug.h> +#include <linux/sunrpc/rpc_rdma.h> +#include <linux/sunrpc/svc_xprt.h> #include <linux/sunrpc/svc_rdma.h> -#include <linux/export.h> + #include "xprt_rdma.h" +#include <trace/events/rpcrdma.h> #define RPCDBG_FACILITY RPCDBG_SVCXPRT -static int svc_rdma_post_recv(struct svcxprt_rdma *xprt); -static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *, int); +static struct svcxprt_rdma *svc_rdma_create_xprt(struct svc_serv *serv, + struct net *net); static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, struct net *net, struct sockaddr *sa, int salen, @@ -123,7 +129,7 @@ static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *serv, struct svcxprt_rdma *cma_xprt; struct svc_xprt *xprt; - cma_xprt = rdma_create_xprt(serv, 0); + cma_xprt = svc_rdma_create_xprt(serv, net); if (!cma_xprt) return ERR_PTR(-ENOMEM); xprt = &cma_xprt->sc_xprt; @@ -152,133 +158,20 @@ static void svc_rdma_bc_free(struct svc_xprt *xprt) } #endif /* CONFIG_SUNRPC_BACKCHANNEL */ -static struct svc_rdma_op_ctxt *alloc_ctxt(struct svcxprt_rdma *xprt, - gfp_t flags) -{ - struct svc_rdma_op_ctxt *ctxt; - - ctxt = kmalloc(sizeof(*ctxt), flags); - if (ctxt) { - ctxt->xprt = xprt; - INIT_LIST_HEAD(&ctxt->list); - } - return ctxt; -} - -static bool svc_rdma_prealloc_ctxts(struct svcxprt_rdma *xprt) -{ - unsigned int i; - - /* Each RPC/RDMA credit can consume one Receive and - * one Send WQE at the same time. - */ - i = xprt->sc_sq_depth + xprt->sc_rq_depth; - - while (i--) { - struct svc_rdma_op_ctxt *ctxt; - - ctxt = alloc_ctxt(xprt, GFP_KERNEL); - if (!ctxt) { - dprintk("svcrdma: No memory for RDMA ctxt\n"); - return false; - } - list_add(&ctxt->list, &xprt->sc_ctxts); - } - return true; -} - -struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt) -{ - struct svc_rdma_op_ctxt *ctxt = NULL; - - spin_lock(&xprt->sc_ctxt_lock); - xprt->sc_ctxt_used++; - if (list_empty(&xprt->sc_ctxts)) - goto out_empty; - - ctxt = list_first_entry(&xprt->sc_ctxts, - struct svc_rdma_op_ctxt, list); - list_del(&ctxt->list); - spin_unlock(&xprt->sc_ctxt_lock); - -out: - ctxt->count = 0; - ctxt->mapped_sges = 0; - return ctxt; - -out_empty: - /* Either pre-allocation missed the mark, or send - * queue accounting is broken. - */ - spin_unlock(&xprt->sc_ctxt_lock); - - ctxt = alloc_ctxt(xprt, GFP_NOIO); - if (ctxt) - goto out; - - spin_lock(&xprt->sc_ctxt_lock); - xprt->sc_ctxt_used--; - spin_unlock(&xprt->sc_ctxt_lock); - WARN_ONCE(1, "svcrdma: empty RDMA ctxt list?\n"); - return NULL; -} - -void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt) -{ - struct svcxprt_rdma *xprt = ctxt->xprt; - struct ib_device *device = xprt->sc_cm_id->device; - unsigned int i; - - for (i = 0; i < ctxt->mapped_sges; i++) - ib_dma_unmap_page(device, - ctxt->sge[i].addr, - ctxt->sge[i].length, - ctxt->direction); - ctxt->mapped_sges = 0; -} - -void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages) -{ - struct svcxprt_rdma *xprt = ctxt->xprt; - int i; - - if (free_pages) - for (i = 0; i < ctxt->count; i++) - put_page(ctxt->pages[i]); - - spin_lock(&xprt->sc_ctxt_lock); - xprt->sc_ctxt_used--; - list_add(&ctxt->list, &xprt->sc_ctxts); - spin_unlock(&xprt->sc_ctxt_lock); -} - -static void svc_rdma_destroy_ctxts(struct svcxprt_rdma *xprt) -{ - while (!list_empty(&xprt->sc_ctxts)) { - struct svc_rdma_op_ctxt *ctxt; - - ctxt = list_first_entry(&xprt->sc_ctxts, - struct svc_rdma_op_ctxt, list); - list_del(&ctxt->list); - kfree(ctxt); - } -} - /* QP event handler */ static void qp_event_handler(struct ib_event *event, void *context) { struct svc_xprt *xprt = context; + trace_svcrdma_qp_error(event, (struct sockaddr *)&xprt->xpt_remote); switch (event->event) { /* These are considered benign events */ case IB_EVENT_PATH_MIG: case IB_EVENT_COMM_EST: case IB_EVENT_SQ_DRAINED: case IB_EVENT_QP_LAST_WQE_REACHED: - dprintk("svcrdma: QP event %s (%d) received for QP=%p\n", - ib_event_msg(event->event), event->event, - event->element.qp); break; + /* These are considered fatal events */ case IB_EVENT_PATH_MIG_ERR: case IB_EVENT_QP_FATAL: @@ -286,111 +179,34 @@ static void qp_event_handler(struct ib_event *event, void *context) case IB_EVENT_QP_ACCESS_ERR: case IB_EVENT_DEVICE_FATAL: default: - dprintk("svcrdma: QP ERROR event %s (%d) received for QP=%p, " - "closing transport\n", - ib_event_msg(event->event), event->event, - event->element.qp); set_bit(XPT_CLOSE, &xprt->xpt_flags); svc_xprt_enqueue(xprt); break; } } -/** - * svc_rdma_wc_receive - Invoked by RDMA provider for each polled Receive WC - * @cq: completion queue - * @wc: completed WR - * - */ -static void svc_rdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc) -{ - struct svcxprt_rdma *xprt = cq->cq_context; - struct ib_cqe *cqe = wc->wr_cqe; - struct svc_rdma_op_ctxt *ctxt; - - /* WARNING: Only wc->wr_cqe and wc->status are reliable */ - ctxt = container_of(cqe, struct svc_rdma_op_ctxt, cqe); - svc_rdma_unmap_dma(ctxt); - - if (wc->status != IB_WC_SUCCESS) - goto flushed; - - /* All wc fields are now known to be valid */ - ctxt->byte_len = wc->byte_len; - spin_lock(&xprt->sc_rq_dto_lock); - list_add_tail(&ctxt->list, &xprt->sc_rq_dto_q); - spin_unlock(&xprt->sc_rq_dto_lock); - - svc_rdma_post_recv(xprt); - - set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags); - if (test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags)) - goto out; - goto out_enqueue; - -flushed: - if (wc->status != IB_WC_WR_FLUSH_ERR) - pr_err("svcrdma: Recv: %s (%u/0x%x)\n", - ib_wc_status_msg(wc->status), - wc->status, wc->vendor_err); - set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); - svc_rdma_put_context(ctxt, 1); - -out_enqueue: - svc_xprt_enqueue(&xprt->sc_xprt); -out: - svc_xprt_put(&xprt->sc_xprt); -} - -/** - * svc_rdma_wc_send - Invoked by RDMA provider for each polled Send WC - * @cq: completion queue - * @wc: completed WR - * - */ -void svc_rdma_wc_send(struct ib_cq *cq, struct ib_wc *wc) -{ - struct svcxprt_rdma *xprt = cq->cq_context; - struct ib_cqe *cqe = wc->wr_cqe; - struct svc_rdma_op_ctxt *ctxt; - - atomic_inc(&xprt->sc_sq_avail); - wake_up(&xprt->sc_send_wait); - - ctxt = container_of(cqe, struct svc_rdma_op_ctxt, cqe); - svc_rdma_unmap_dma(ctxt); - svc_rdma_put_context(ctxt, 1); - - if (unlikely(wc->status != IB_WC_SUCCESS)) { - set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); - svc_xprt_enqueue(&xprt->sc_xprt); - if (wc->status != IB_WC_WR_FLUSH_ERR) - pr_err("svcrdma: Send: %s (%u/0x%x)\n", - ib_wc_status_msg(wc->status), - wc->status, wc->vendor_err); - } - - svc_xprt_put(&xprt->sc_xprt); -} - -static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv, - int listener) +static struct svcxprt_rdma *svc_rdma_create_xprt(struct svc_serv *serv, + struct net *net) { struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL); - if (!cma_xprt) + if (!cma_xprt) { + dprintk("svcrdma: failed to create new transport\n"); return NULL; - svc_xprt_init(&init_net, &svc_rdma_class, &cma_xprt->sc_xprt, serv); + } + svc_xprt_init(net, &svc_rdma_class, &cma_xprt->sc_xprt, serv); INIT_LIST_HEAD(&cma_xprt->sc_accept_q); INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q); INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q); - INIT_LIST_HEAD(&cma_xprt->sc_ctxts); + INIT_LIST_HEAD(&cma_xprt->sc_send_ctxts); + INIT_LIST_HEAD(&cma_xprt->sc_recv_ctxts); INIT_LIST_HEAD(&cma_xprt->sc_rw_ctxts); init_waitqueue_head(&cma_xprt->sc_send_wait); spin_lock_init(&cma_xprt->sc_lock); spin_lock_init(&cma_xprt->sc_rq_dto_lock); - spin_lock_init(&cma_xprt->sc_ctxt_lock); + spin_lock_init(&cma_xprt->sc_send_lock); + spin_lock_init(&cma_xprt->sc_recv_lock); spin_lock_init(&cma_xprt->sc_rw_ctxt_lock); /* @@ -401,70 +217,9 @@ static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv, */ set_bit(XPT_CONG_CTRL, &cma_xprt->sc_xprt.xpt_flags); - if (listener) { - strcpy(cma_xprt->sc_xprt.xpt_remotebuf, "listener"); - set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags); - } - return cma_xprt; } -static int -svc_rdma_post_recv(struct svcxprt_rdma *xprt) -{ - struct ib_recv_wr recv_wr, *bad_recv_wr; - struct svc_rdma_op_ctxt *ctxt; - struct page *page; - dma_addr_t pa; - int sge_no; - int buflen; - int ret; - - ctxt = svc_rdma_get_context(xprt); - buflen = 0; - ctxt->direction = DMA_FROM_DEVICE; - ctxt->cqe.done = svc_rdma_wc_receive; - for (sge_no = 0; buflen < xprt->sc_max_req_size; sge_no++) { - if (sge_no >= xprt->sc_max_sge) { - pr_err("svcrdma: Too many sges (%d)\n", sge_no); - goto err_put_ctxt; - } - page = alloc_page(GFP_KERNEL); - if (!page) - goto err_put_ctxt; - ctxt->pages[sge_no] = page; - pa = ib_dma_map_page(xprt->sc_cm_id->device, - page, 0, PAGE_SIZE, - DMA_FROM_DEVICE); - if (ib_dma_mapping_error(xprt->sc_cm_id->device, pa)) - goto err_put_ctxt; - svc_rdma_count_mappings(xprt, ctxt); - ctxt->sge[sge_no].addr = pa; - ctxt->sge[sge_no].length = PAGE_SIZE; - ctxt->sge[sge_no].lkey = xprt->sc_pd->local_dma_lkey; - ctxt->count = sge_no + 1; - buflen += PAGE_SIZE; - } - recv_wr.next = NULL; - recv_wr.sg_list = &ctxt->sge[0]; - recv_wr.num_sge = ctxt->count; - recv_wr.wr_cqe = &ctxt->cqe; - - svc_xprt_get(&xprt->sc_xprt); - ret = ib_post_recv(xprt->sc_qp, &recv_wr, &bad_recv_wr); - if (ret) { - svc_rdma_unmap_dma(ctxt); - svc_rdma_put_context(ctxt, 1); - svc_xprt_put(&xprt->sc_xprt); - } - return ret; - - err_put_ctxt: - svc_rdma_unmap_dma(ctxt); - svc_rdma_put_context(ctxt, 1); - return -ENOMEM; -} - static void svc_rdma_parse_connect_private(struct svcxprt_rdma *newxprt, struct rdma_conn_param *param) @@ -504,15 +259,12 @@ static void handle_connect_req(struct rdma_cm_id *new_cma_id, struct sockaddr *sa; /* Create a new transport */ - newxprt = rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 0); - if (!newxprt) { - dprintk("svcrdma: failed to create new transport\n"); + newxprt = svc_rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, + listen_xprt->sc_xprt.xpt_net); + if (!newxprt) return; - } newxprt->sc_cm_id = new_cma_id; new_cma_id->context = newxprt; - dprintk("svcrdma: Creating newxprt=%p, cm_id=%p, listenxprt=%p\n", - newxprt, newxprt->sc_cm_id, listen_xprt); svc_rdma_parse_connect_private(newxprt, param); /* Save client advertised inbound read limit for use later in accept. */ @@ -543,9 +295,11 @@ static void handle_connect_req(struct rdma_cm_id *new_cma_id, static int rdma_listen_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) { - struct svcxprt_rdma *xprt = cma_id->context; + struct sockaddr *sap = (struct sockaddr *)&cma_id->route.addr.src_addr; int ret = 0; + trace_svcrdma_cm_event(event, sap); + switch (event->event) { case RDMA_CM_EVENT_CONNECT_REQUEST: dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, " @@ -553,23 +307,8 @@ static int rdma_listen_handler(struct rdma_cm_id *cma_id, rdma_event_msg(event->event), event->event); handle_connect_req(cma_id, &event->param.conn); break; - - case RDMA_CM_EVENT_ESTABLISHED: - /* Accept complete */ - dprintk("svcrdma: Connection completed on LISTEN xprt=%p, " - "cm_id=%p\n", xprt, cma_id); - break; - - case RDMA_CM_EVENT_DEVICE_REMOVAL: - dprintk("svcrdma: Device removal xprt=%p, cm_id=%p\n", - xprt, cma_id); - if (xprt) { - set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); - svc_xprt_enqueue(&xprt->sc_xprt); - } - break; - default: + /* NB: No device removal upcall for INADDR_ANY listeners */ dprintk("svcrdma: Unexpected event on listening endpoint %p, " "event = %s (%d)\n", cma_id, rdma_event_msg(event->event), event->event); @@ -582,9 +321,12 @@ static int rdma_listen_handler(struct rdma_cm_id *cma_id, static int rdma_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event) { - struct svc_xprt *xprt = cma_id->context; - struct svcxprt_rdma *rdma = - container_of(xprt, struct svcxprt_rdma, sc_xprt); + struct sockaddr *sap = (struct sockaddr *)&cma_id->route.addr.dst_addr; + struct svcxprt_rdma *rdma = cma_id->context; + struct svc_xprt *xprt = &rdma->sc_xprt; + + trace_svcrdma_cm_event(event, sap); + switch (event->event) { case RDMA_CM_EVENT_ESTABLISHED: /* Accept complete */ @@ -597,21 +339,17 @@ static int rdma_cma_handler(struct rdma_cm_id *cma_id, case RDMA_CM_EVENT_DISCONNECTED: dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n", xprt, cma_id); - if (xprt) { - set_bit(XPT_CLOSE, &xprt->xpt_flags); - svc_xprt_enqueue(xprt); - svc_xprt_put(xprt); - } + set_bit(XPT_CLOSE, &xprt->xpt_flags); + svc_xprt_enqueue(xprt); + svc_xprt_put(xprt); break; case RDMA_CM_EVENT_DEVICE_REMOVAL: dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, " "event = %s (%d)\n", cma_id, xprt, rdma_event_msg(event->event), event->event); - if (xprt) { - set_bit(XPT_CLOSE, &xprt->xpt_flags); - svc_xprt_enqueue(xprt); - svc_xprt_put(xprt); - } + set_bit(XPT_CLOSE, &xprt->xpt_flags); + svc_xprt_enqueue(xprt); + svc_xprt_put(xprt); break; default: dprintk("svcrdma: Unexpected event on DTO endpoint %p, " @@ -634,16 +372,18 @@ static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, struct svcxprt_rdma *cma_xprt; int ret; - dprintk("svcrdma: Creating RDMA socket\n"); + dprintk("svcrdma: Creating RDMA listener\n"); if ((sa->sa_family != AF_INET) && (sa->sa_family != AF_INET6)) { dprintk("svcrdma: Address family %d is not supported.\n", sa->sa_family); return ERR_PTR(-EAFNOSUPPORT); } - cma_xprt = rdma_create_xprt(serv, 1); + cma_xprt = svc_rdma_create_xprt(serv, net); if (!cma_xprt) return ERR_PTR(-ENOMEM); + set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags); + strcpy(cma_xprt->sc_xprt.xpt_remotebuf, "listener"); - listen_id = rdma_create_id(&init_net, rdma_listen_handler, cma_xprt, + listen_id = rdma_create_id(net, rdma_listen_handler, cma_xprt, RDMA_PS_TCP, IB_QPT_RC); if (IS_ERR(listen_id)) { ret = PTR_ERR(listen_id); @@ -708,9 +448,9 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) struct rdma_conn_param conn_param; struct rpcrdma_connect_private pmsg; struct ib_qp_init_attr qp_attr; + unsigned int ctxts, rq_depth; struct ib_device *dev; struct sockaddr *sap; - unsigned int i, ctxts; int ret = 0; listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); @@ -736,24 +476,28 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) /* Qualify the transport resource defaults with the * capabilities of this particular device */ - newxprt->sc_max_sge = min((size_t)dev->attrs.max_sge, - (size_t)RPCSVC_MAXPAGES); + newxprt->sc_max_send_sges = dev->attrs.max_sge; + /* transport hdr, head iovec, one page list entry, tail iovec */ + if (newxprt->sc_max_send_sges < 4) { + pr_err("svcrdma: too few Send SGEs available (%d)\n", + newxprt->sc_max_send_sges); + goto errout; + } newxprt->sc_max_req_size = svcrdma_max_req_size; newxprt->sc_max_requests = svcrdma_max_requests; newxprt->sc_max_bc_requests = svcrdma_max_bc_requests; - newxprt->sc_rq_depth = newxprt->sc_max_requests + - newxprt->sc_max_bc_requests; - if (newxprt->sc_rq_depth > dev->attrs.max_qp_wr) { + rq_depth = newxprt->sc_max_requests + newxprt->sc_max_bc_requests; + if (rq_depth > dev->attrs.max_qp_wr) { pr_warn("svcrdma: reducing receive depth to %d\n", dev->attrs.max_qp_wr); - newxprt->sc_rq_depth = dev->attrs.max_qp_wr; - newxprt->sc_max_requests = newxprt->sc_rq_depth - 2; + rq_depth = dev->attrs.max_qp_wr; + newxprt->sc_max_requests = rq_depth - 2; newxprt->sc_max_bc_requests = 2; } newxprt->sc_fc_credits = cpu_to_be32(newxprt->sc_max_requests); ctxts = rdma_rw_mr_factor(dev, newxprt->sc_port_num, RPCSVC_MAXPAGES); ctxts *= newxprt->sc_max_requests; - newxprt->sc_sq_depth = newxprt->sc_rq_depth + ctxts; + newxprt->sc_sq_depth = rq_depth + ctxts; if (newxprt->sc_sq_depth > dev->attrs.max_qp_wr) { pr_warn("svcrdma: reducing send depth to %d\n", dev->attrs.max_qp_wr); @@ -761,9 +505,6 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) } atomic_set(&newxprt->sc_sq_avail, newxprt->sc_sq_depth); - if (!svc_rdma_prealloc_ctxts(newxprt)) - goto errout; - newxprt->sc_pd = ib_alloc_pd(dev, 0); if (IS_ERR(newxprt->sc_pd)) { dprintk("svcrdma: error creating PD for connect request\n"); @@ -775,7 +516,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) dprintk("svcrdma: error creating SQ CQ for connect request\n"); goto errout; } - newxprt->sc_rq_cq = ib_alloc_cq(dev, newxprt, newxprt->sc_rq_depth, + newxprt->sc_rq_cq = ib_alloc_cq(dev, newxprt, rq_depth, 0, IB_POLL_WORKQUEUE); if (IS_ERR(newxprt->sc_rq_cq)) { dprintk("svcrdma: error creating RQ CQ for connect request\n"); @@ -788,9 +529,9 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) qp_attr.port_num = newxprt->sc_port_num; qp_attr.cap.max_rdma_ctxs = ctxts; qp_attr.cap.max_send_wr = newxprt->sc_sq_depth - ctxts; - qp_attr.cap.max_recv_wr = newxprt->sc_rq_depth; - qp_attr.cap.max_send_sge = newxprt->sc_max_sge; - qp_attr.cap.max_recv_sge = newxprt->sc_max_sge; + qp_attr.cap.max_recv_wr = rq_depth; + qp_attr.cap.max_send_sge = newxprt->sc_max_send_sges; + qp_attr.cap.max_recv_sge = 1; qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; qp_attr.qp_type = IB_QPT_RC; qp_attr.send_cq = newxprt->sc_sq_cq; @@ -815,14 +556,8 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) !rdma_ib_or_roce(dev, newxprt->sc_port_num)) goto errout; - /* Post receive buffers */ - for (i = 0; i < newxprt->sc_max_requests; i++) { - ret = svc_rdma_post_recv(newxprt); - if (ret) { - dprintk("svcrdma: failure posting receive buffers\n"); - goto errout; - } - } + if (!svc_rdma_post_recvs(newxprt)) + goto errout; /* Swap out the handler */ newxprt->sc_cm_id->event_handler = rdma_cma_handler; @@ -856,16 +591,18 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) dprintk(" local address : %pIS:%u\n", sap, rpc_get_port(sap)); sap = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; dprintk(" remote address : %pIS:%u\n", sap, rpc_get_port(sap)); - dprintk(" max_sge : %d\n", newxprt->sc_max_sge); + dprintk(" max_sge : %d\n", newxprt->sc_max_send_sges); dprintk(" sq_depth : %d\n", newxprt->sc_sq_depth); dprintk(" rdma_rw_ctxs : %d\n", ctxts); dprintk(" max_requests : %d\n", newxprt->sc_max_requests); dprintk(" ord : %d\n", conn_param.initiator_depth); + trace_svcrdma_xprt_accept(&newxprt->sc_xprt); return &newxprt->sc_xprt; errout: dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret); + trace_svcrdma_xprt_fail(&newxprt->sc_xprt); /* Take a reference in case the DTO handler runs */ svc_xprt_get(&newxprt->sc_xprt); if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp)) @@ -896,7 +633,6 @@ static void svc_rdma_detach(struct svc_xprt *xprt) { struct svcxprt_rdma *rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); - dprintk("svc: svc_rdma_detach(%p)\n", xprt); /* Disconnect and flush posted WQE */ rdma_disconnect(rdma->sc_cm_id); @@ -908,7 +644,7 @@ static void __svc_rdma_free(struct work_struct *work) container_of(work, struct svcxprt_rdma, sc_work); struct svc_xprt *xprt = &rdma->sc_xprt; - dprintk("svcrdma: %s(%p)\n", __func__, rdma); + trace_svcrdma_xprt_free(xprt); if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) ib_drain_qp(rdma->sc_qp); @@ -918,25 +654,7 @@ static void __svc_rdma_free(struct work_struct *work) pr_err("svcrdma: sc_xprt still in use? (%d)\n", kref_read(&xprt->xpt_ref)); - while (!list_empty(&rdma->sc_read_complete_q)) { - struct svc_rdma_op_ctxt *ctxt; - ctxt = list_first_entry(&rdma->sc_read_complete_q, - struct svc_rdma_op_ctxt, list); - list_del(&ctxt->list); - svc_rdma_put_context(ctxt, 1); - } - while (!list_empty(&rdma->sc_rq_dto_q)) { - struct svc_rdma_op_ctxt *ctxt; - ctxt = list_first_entry(&rdma->sc_rq_dto_q, - struct svc_rdma_op_ctxt, list); - list_del(&ctxt->list); - svc_rdma_put_context(ctxt, 1); - } - - /* Warn if we leaked a resource or under-referenced */ - if (rdma->sc_ctxt_used != 0) - pr_err("svcrdma: ctxt still in use? (%d)\n", - rdma->sc_ctxt_used); + svc_rdma_flush_recv_queues(rdma); /* Final put of backchannel client transport */ if (xprt->xpt_bc_xprt) { @@ -945,7 +663,8 @@ static void __svc_rdma_free(struct work_struct *work) } svc_rdma_destroy_rw_ctxts(rdma); - svc_rdma_destroy_ctxts(rdma); + svc_rdma_send_ctxts_destroy(rdma); + svc_rdma_recv_ctxts_destroy(rdma); /* Destroy the QP if present (not a listener) */ if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) @@ -998,51 +717,3 @@ static void svc_rdma_secure_port(struct svc_rqst *rqstp) static void svc_rdma_kill_temp_xprt(struct svc_xprt *xprt) { } - -int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr) -{ - struct ib_send_wr *bad_wr, *n_wr; - int wr_count; - int i; - int ret; - - if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags)) - return -ENOTCONN; - - wr_count = 1; - for (n_wr = wr->next; n_wr; n_wr = n_wr->next) - wr_count++; - - /* If the SQ is full, wait until an SQ entry is available */ - while (1) { - if ((atomic_sub_return(wr_count, &xprt->sc_sq_avail) < 0)) { - atomic_inc(&rdma_stat_sq_starve); - - /* Wait until SQ WR available if SQ still full */ - atomic_add(wr_count, &xprt->sc_sq_avail); - wait_event(xprt->sc_send_wait, - atomic_read(&xprt->sc_sq_avail) > wr_count); - if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags)) - return -ENOTCONN; - continue; - } - /* Take a transport ref for each WR posted */ - for (i = 0; i < wr_count; i++) - svc_xprt_get(&xprt->sc_xprt); - - /* Bump used SQ WR count and post */ - ret = ib_post_send(xprt->sc_qp, wr, &bad_wr); - if (ret) { - set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); - for (i = 0; i < wr_count; i ++) - svc_xprt_put(&xprt->sc_xprt); - dprintk("svcrdma: failed to post SQ WR rc=%d\n", ret); - dprintk(" sc_sq_avail=%d, sc_sq_depth=%d\n", - atomic_read(&xprt->sc_sq_avail), - xprt->sc_sq_depth); - wake_up(&xprt->sc_send_wait); - } - break; - } - return ret; -} diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c index cc1aad325496..caca977e3755 100644 --- a/net/sunrpc/xprtrdma/transport.c +++ b/net/sunrpc/xprtrdma/transport.c @@ -51,9 +51,13 @@ #include <linux/module.h> #include <linux/slab.h> #include <linux/seq_file.h> +#include <linux/smp.h> + #include <linux/sunrpc/addr.h> +#include <linux/sunrpc/svc_rdma.h> #include "xprt_rdma.h" +#include <trace/events/rpcrdma.h> #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) # define RPCDBG_FACILITY RPCDBG_TRANS diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index c345d365af88..7f913ece5038 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -59,6 +59,7 @@ #include <rdma/ib_cm.h> #include "xprt_rdma.h" +#include <trace/events/rpcrdma.h> /* * Globals/Macros diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h index cb41b12a3bf8..f845b71793e2 100644 --- a/net/sunrpc/xprtrdma/xprt_rdma.h +++ b/net/sunrpc/xprtrdma/xprt_rdma.h @@ -675,5 +675,3 @@ void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int); extern struct xprt_class xprt_rdma_bc; #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */ - -#include <trace/events/rpcrdma.h> |