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[188.28.125.106]) by smtp.gmail.com with ESMTPSA id u2-20020a5d5142000000b0021b966abc19sm37982131wrt.19.2022.07.07.04.52.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Jul 2022 04:52:11 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: "David S . Miller" , Jakub Kicinski , Jonathan Lemon , Willem de Bruijn , Jens Axboe , David Ahern , kernel-team@fb.com, Pavel Begunkov Subject: [PATCH net-next v4 22/27] io_uring: sendzc with fixed buffers Date: Thu, 7 Jul 2022 12:49:53 +0100 Message-Id: X-Mailer: git-send-email 2.36.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Allow zerocopy sends to use fixed buffers. There is an optimisation for this case, the network layer don't need to reference the pages, see SKBFL_MANAGED_FRAG_REFS, so io_uring have to ensure validity of fixed buffers until the notifier is released. Signed-off-by: Pavel Begunkov --- include/uapi/linux/io_uring.h | 6 +++++- io_uring/net.c | 29 ++++++++++++++++++++++++----- 2 files changed, 29 insertions(+), 6 deletions(-) diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 25278c9ac6d2..8d050c247d6b 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -269,9 +269,13 @@ enum io_uring_op { * IORING_RECV_MULTISHOT Multishot recv. Sets IORING_CQE_F_MORE if * the handler will continue to report * CQEs on behalf of the same SQE. + * + * IORING_RECVSEND_FIXED_BUF Use registered buffers, the index is stored in + * the buf_index field. */ #define IORING_RECVSEND_POLL_FIRST (1U << 0) -#define IORING_RECV_MULTISHOT (1U << 1) +#define IORING_RECV_MULTISHOT (1U << 1) +#define IORING_RECVSEND_FIXED_BUF (1U << 2) /* * accept flags stored in sqe->ioprio diff --git a/io_uring/net.c b/io_uring/net.c index 2172cf3facd8..0259fbbad591 100644 --- a/io_uring/net.c +++ b/io_uring/net.c @@ -14,6 +14,7 @@ #include "kbuf.h" #include "net.h" #include "notif.h" +#include "rsrc.h" #if defined(CONFIG_NET) struct io_shutdown { @@ -667,13 +668,23 @@ int io_recv(struct io_kiocb *req, unsigned int issue_flags) int io_sendzc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { struct io_sendzc *zc = io_kiocb_to_cmd(req); + struct io_ring_ctx *ctx = req->ctx; if (READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3)) return -EINVAL; zc->flags = READ_ONCE(sqe->ioprio); - if (zc->flags & ~IORING_RECVSEND_POLL_FIRST) + if (zc->flags & ~(IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_FIXED_BUF)) return -EINVAL; + if (zc->flags & IORING_RECVSEND_FIXED_BUF) { + unsigned idx = READ_ONCE(sqe->buf_index); + + if (unlikely(idx >= ctx->nr_user_bufs)) + return -EFAULT; + idx = array_index_nospec(idx, ctx->nr_user_bufs); + req->imu = READ_ONCE(ctx->user_bufs[idx]); + io_req_set_rsrc_node(req, ctx, 0); + } zc->buf = u64_to_user_ptr(READ_ONCE(sqe->addr)); zc->len = READ_ONCE(sqe->len); @@ -727,10 +738,18 @@ int io_sendzc(struct io_kiocb *req, unsigned int issue_flags) msg.msg_controllen = 0; msg.msg_namelen = 0; - ret = import_single_range(WRITE, zc->buf, zc->len, &iov, &msg.msg_iter); - if (unlikely(ret)) - return ret; - mm_account_pinned_pages(¬if->uarg.mmp, zc->len); + if (zc->flags & IORING_RECVSEND_FIXED_BUF) { + ret = io_import_fixed(WRITE, &msg.msg_iter, req->imu, + (u64)zc->buf, zc->len); + if (unlikely(ret)) + return ret; + } else { + ret = import_single_range(WRITE, zc->buf, zc->len, &iov, + &msg.msg_iter); + if (unlikely(ret)) + return ret; + mm_account_pinned_pages(¬if->uarg.mmp, zc->len); + } if (zc->addr) { ret = move_addr_to_kernel(zc->addr, zc->addr_len, &address); -- 2.36.1