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[188.28.125.106]) by smtp.gmail.com with ESMTPSA id t21-20020a05640203d500b0043573c59ea0sm9758451edw.90.2022.06.28.12.00.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Jun 2022 12:00:24 -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 , kernel-team@fb.com, Pavel Begunkov Subject: [RFC net-next v3 27/29] io_uring: allow to override zc tag on flush Date: Tue, 28 Jun 2022 19:56:49 +0100 Message-Id: <011c5487e38ceb5700351ef60d49eedb431f22e0.1653992701.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC Add a new sendzc flag, IORING_SENDZC_COPY_TAG. When set and the request flushing a notification, it'll set the notification tag to sqe->user_data. This adds a bit more flexibility allowing to specify notification tags on per-request basis. One use cases is combining the new flag with IOSQE_CQE_SKIP_SUCCESS, so either the request fails and we expect an CQE with a failure and no notification, or it succedees, then there will be no request completion but only a zc notification with an overriden tag. In other words, in the described scheme it posts only one CQE with user_data set to the current requests sqe->user_data. note 1: the flat has no effect if nothing is flushed, e.g. there was no IORING_SENDZC_FLUSH or the request failed. note 2: copying sqe->user_data may be not ideal, but we don't have extra space in SQE to keep a second tag/user_data. Signed-off-by: Pavel Begunkov --- fs/io_uring.c | 9 +++++++-- include/uapi/linux/io_uring.h | 1 + 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index f5fe2ab5622a..08c98a4d9bd2 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -6581,7 +6581,8 @@ static int io_send(struct io_kiocb *req, unsigned int issue_flags) return 0; } -#define IO_SENDZC_VALID_FLAGS (IORING_SENDZC_FIXED_BUF|IORING_SENDZC_FLUSH) +#define IO_SENDZC_VALID_FLAGS (IORING_SENDZC_FIXED_BUF | IORING_SENDZC_FLUSH | \ + IORING_SENDZC_OVERRIDE_TAG) static int io_sendzc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { @@ -6686,7 +6687,11 @@ static int io_sendzc(struct io_kiocb *req, unsigned int issue_flags) ret = sock_sendmsg(sock, &msg); if (likely(ret >= min_ret)) { - if (req->msgzc.zc_flags & IORING_SENDZC_FLUSH) + unsigned zc_flags = req->msgzc.zc_flags; + + if (zc_flags & IORING_SENDZC_OVERRIDE_TAG) + notif->tag = req->cqe.user_data; + if (zc_flags & IORING_SENDZC_FLUSH) io_notif_slot_flush_submit(notif_slot, 0); } else { if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 7d77d90a5f8a..7533387f25d3 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -280,6 +280,7 @@ enum { enum { IORING_SENDZC_FIXED_BUF = (1U << 0), IORING_SENDZC_FLUSH = (1U << 1), + IORING_SENDZC_OVERRIDE_TAG = (1U << 2), }; /*