X-Git-Url: http://git.cascardo.eti.br/?a=blobdiff_plain;f=net%2Fsunrpc%2Fxprtrdma%2Ftransport.c;h=ed5e285fd2ea7f6f26bf08d2d1e8d28db7823f63;hb=5aa43efe905bdf3f1bd3cfddf035f7ebee2590eb;hp=81f0e879f019e43d35cc9c85ead0dfd17ebc8d30;hpb=d5bd1eba19230347acfc4960581a15bfb459a615;p=cascardo%2Flinux.git diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c index 81f0e879f019..ed5e285fd2ea 100644 --- a/net/sunrpc/xprtrdma/transport.c +++ b/net/sunrpc/xprtrdma/transport.c @@ -97,7 +97,7 @@ static struct ctl_table xr_tunables_table[] = { .data = &xprt_rdma_max_inline_read, .maxlen = sizeof(unsigned int), .mode = 0644, - .proc_handler = proc_dointvec, + .proc_handler = proc_dointvec_minmax, .extra1 = &min_inline_size, .extra2 = &max_inline_size, }, @@ -106,7 +106,7 @@ static struct ctl_table xr_tunables_table[] = { .data = &xprt_rdma_max_inline_write, .maxlen = sizeof(unsigned int), .mode = 0644, - .proc_handler = proc_dointvec, + .proc_handler = proc_dointvec_minmax, .extra1 = &min_inline_size, .extra2 = &max_inline_size, }, @@ -477,115 +477,152 @@ xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task) } } -/* - * The RDMA allocate/free functions need the task structure as a place - * to hide the struct rpcrdma_req, which is necessary for the actual send/recv - * sequence. +/* Allocate a fixed-size buffer in which to construct and send the + * RPC-over-RDMA header for this request. + */ +static bool +rpcrdma_get_rdmabuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, + gfp_t flags) +{ + size_t size = RPCRDMA_HDRBUF_SIZE; + struct rpcrdma_regbuf *rb; + + if (req->rl_rdmabuf) + return true; + + rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, flags); + if (IS_ERR(rb)) + return false; + + r_xprt->rx_stats.hardway_register_count += size; + req->rl_rdmabuf = rb; + return true; +} + +static bool +rpcrdma_get_sendbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, + size_t size, gfp_t flags) +{ + struct rpcrdma_regbuf *rb; + + if (req->rl_sendbuf && rdmab_length(req->rl_sendbuf) >= size) + return true; + + rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, flags); + if (IS_ERR(rb)) + return false; + + rpcrdma_free_regbuf(req->rl_sendbuf); + r_xprt->rx_stats.hardway_register_count += size; + req->rl_sendbuf = rb; + return true; +} + +/* The rq_rcv_buf is used only if a Reply chunk is necessary. + * The decision to use a Reply chunk is made later in + * rpcrdma_marshal_req. This buffer is registered at that time. * - * The RPC layer allocates both send and receive buffers in the same call - * (rq_send_buf and rq_rcv_buf are both part of a single contiguous buffer). - * We may register rq_rcv_buf when using reply chunks. + * Otherwise, the associated RPC Reply arrives in a separate + * Receive buffer, arbitrarily chosen by the HCA. The buffer + * allocated here for the RPC Reply is not utilized in that + * case. See rpcrdma_inline_fixup. + * + * A regbuf is used here to remember the buffer size. */ -static void * -xprt_rdma_allocate(struct rpc_task *task, size_t size) +static bool +rpcrdma_get_recvbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, + size_t size, gfp_t flags) { - struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; - struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); struct rpcrdma_regbuf *rb; + + if (req->rl_recvbuf && rdmab_length(req->rl_recvbuf) >= size) + return true; + + rb = rpcrdma_alloc_regbuf(size, DMA_NONE, flags); + if (IS_ERR(rb)) + return false; + + rpcrdma_free_regbuf(req->rl_recvbuf); + r_xprt->rx_stats.hardway_register_count += size; + req->rl_recvbuf = rb; + return true; +} + +/** + * xprt_rdma_allocate - allocate transport resources for an RPC + * @task: RPC task + * + * Return values: + * 0: Success; rq_buffer points to RPC buffer to use + * ENOMEM: Out of memory, call again later + * EIO: A permanent error occurred, do not retry + * + * The RDMA allocate/free functions need the task structure as a place + * to hide the struct rpcrdma_req, which is necessary for the actual + * send/recv sequence. + * + * xprt_rdma_allocate provides buffers that are already mapped for + * DMA, and a local DMA lkey is provided for each. + */ +static int +xprt_rdma_allocate(struct rpc_task *task) +{ + struct rpc_rqst *rqst = task->tk_rqstp; + struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt); struct rpcrdma_req *req; - size_t min_size; gfp_t flags; req = rpcrdma_buffer_get(&r_xprt->rx_buf); if (req == NULL) - return NULL; + return -ENOMEM; flags = RPCRDMA_DEF_GFP; if (RPC_IS_SWAPPER(task)) flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN; - if (req->rl_rdmabuf == NULL) - goto out_rdmabuf; - if (req->rl_sendbuf == NULL) - goto out_sendbuf; - if (size > req->rl_sendbuf->rg_size) - goto out_sendbuf; - -out: - dprintk("RPC: %s: size %zd, request 0x%p\n", __func__, size, req); - req->rl_connect_cookie = 0; /* our reserved value */ - req->rl_task = task; - return req->rl_sendbuf->rg_base; - -out_rdmabuf: - min_size = RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp); - rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, min_size, flags); - if (IS_ERR(rb)) + if (!rpcrdma_get_rdmabuf(r_xprt, req, flags)) goto out_fail; - req->rl_rdmabuf = rb; - -out_sendbuf: - /* XDR encoding and RPC/RDMA marshaling of this request has not - * yet occurred. Thus a lower bound is needed to prevent buffer - * overrun during marshaling. - * - * RPC/RDMA marshaling may choose to send payload bearing ops - * inline, if the result is smaller than the inline threshold. - * The value of the "size" argument accounts for header - * requirements but not for the payload in these cases. - * - * Likewise, allocate enough space to receive a reply up to the - * size of the inline threshold. - * - * It's unlikely that both the send header and the received - * reply will be large, but slush is provided here to allow - * flexibility when marshaling. - */ - min_size = RPCRDMA_INLINE_READ_THRESHOLD(task->tk_rqstp); - min_size += RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp); - if (size < min_size) - size = min_size; - - rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, size, flags); - if (IS_ERR(rb)) + if (!rpcrdma_get_sendbuf(r_xprt, req, rqst->rq_callsize, flags)) + goto out_fail; + if (!rpcrdma_get_recvbuf(r_xprt, req, rqst->rq_rcvsize, flags)) goto out_fail; - rb->rg_owner = req; - r_xprt->rx_stats.hardway_register_count += size; - rpcrdma_free_regbuf(&r_xprt->rx_ia, req->rl_sendbuf); - req->rl_sendbuf = rb; - goto out; + dprintk("RPC: %5u %s: send size = %zd, recv size = %zd, req = %p\n", + task->tk_pid, __func__, rqst->rq_callsize, + rqst->rq_rcvsize, req); + + req->rl_connect_cookie = 0; /* our reserved value */ + rpcrdma_set_xprtdata(rqst, req); + rqst->rq_buffer = req->rl_sendbuf->rg_base; + rqst->rq_rbuffer = req->rl_recvbuf->rg_base; + return 0; out_fail: rpcrdma_buffer_put(req); - return NULL; + return -ENOMEM; } -/* - * This function returns all RDMA resources to the pool. +/** + * xprt_rdma_free - release resources allocated by xprt_rdma_allocate + * @task: RPC task + * + * Caller guarantees rqst->rq_buffer is non-NULL. */ static void -xprt_rdma_free(void *buffer) +xprt_rdma_free(struct rpc_task *task) { - struct rpcrdma_req *req; - struct rpcrdma_xprt *r_xprt; - struct rpcrdma_regbuf *rb; - - if (buffer == NULL) - return; + struct rpc_rqst *rqst = task->tk_rqstp; + struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt); + struct rpcrdma_req *req = rpcr_to_rdmar(rqst); + struct rpcrdma_ia *ia = &r_xprt->rx_ia; - rb = container_of(buffer, struct rpcrdma_regbuf, rg_base[0]); - req = rb->rg_owner; if (req->rl_backchannel) return; - r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf); - dprintk("RPC: %s: called on 0x%p\n", __func__, req->rl_reply); - r_xprt->rx_ia.ri_ops->ro_unmap_safe(r_xprt, req, - !RPC_IS_ASYNC(req->rl_task)); - + ia->ri_ops->ro_unmap_safe(r_xprt, req, !RPC_IS_ASYNC(task)); + rpcrdma_unmap_sges(ia, req); rpcrdma_buffer_put(req); } @@ -685,10 +722,11 @@ void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) r_xprt->rx_stats.failed_marshal_count, r_xprt->rx_stats.bad_reply_count, r_xprt->rx_stats.nomsg_call_count); - seq_printf(seq, "%lu %lu %lu\n", + seq_printf(seq, "%lu %lu %lu %lu\n", r_xprt->rx_stats.mrs_recovered, r_xprt->rx_stats.mrs_orphaned, - r_xprt->rx_stats.mrs_allocated); + r_xprt->rx_stats.mrs_allocated, + r_xprt->rx_stats.local_inv_needed); } static int