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Wed, 28 Sep 2022 02:46:29 +0900 (KST) Received: from epsmtrp2.samsung.com (unknown [182.195.40.14]) by epcas5p2.samsung.com (KnoxPortal) with ESMTPA id 20220927174628epcas5p21beda845f26eedeb538cb67e286954d4~YyL-pGxQ51324413244epcas5p2z; Tue, 27 Sep 2022 17:46:28 +0000 (GMT) Received: from epsmgms1p2.samsung.com (unknown [182.195.42.42]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20220927174628epsmtrp23f8d0307799fd395005bf7627abf1dae~YyL-oZzhm3251332513epsmtrp2e; Tue, 27 Sep 2022 17:46:28 +0000 (GMT) X-AuditID: b6c32a4a-007ff70000019a35-8c-633336f5910b Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgms1p2.samsung.com (Symantec Messaging Gateway) with SMTP id 43.86.18644.4F633336; Wed, 28 Sep 2022 02:46:28 +0900 (KST) Received: from localhost.localdomain (unknown [107.110.206.5]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20220927174627epsmtip13333a33747e87502e44e237be49767b0~YyL_O04190699506995epsmtip1i; Tue, 27 Sep 2022 17:46:27 +0000 (GMT) From: Kanchan Joshi To: axboe@kernel.dk, hch@lst.de, kbusch@kernel.org Cc: io-uring@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, gost.dev@samsung.com, Anuj Gupta , Kanchan Joshi Subject: [PATCH for-next v10 2/7] io_uring: introduce fixed buffer support for io_uring_cmd Date: Tue, 27 Sep 2022 23:06:05 +0530 Message-Id: <20220927173610.7794-3-joshi.k@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220927173610.7794-1-joshi.k@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFuplk+LIzCtJLcpLzFFi42LZdlhTQ/ermXGywesHshZNE/4yW6y+289m cfPATiaLlauPMlm8az3HYnH0/1s2i0mHrjFa7L2lbTF/2VN2B06Py2dLPTat6mTz2Lyk3mP3 zQY2j74tqxg9Pm+SC2CLyrbJSE1MSS1SSM1Lzk/JzEu3VfIOjneONzUzMNQ1tLQwV1LIS8xN tVVy8QnQdcvMATpJSaEsMacUKBSQWFyspG9nU5RfWpKqkJFfXGKrlFqQklNgUqBXnJhbXJqX rpeXWmJlaGBgZApUmJCdcWTLRMaCj6IVt3/NYmtg/C7YxcjJISFgIrFh/Uu2LkYuDiGB3YwS d9+3M0E4n4CcibugnM+MEo9ObWSFaZl/ZwqYLSSwi1Fi7xlfuKLWI+eBZnFwsAloSlyYXApS IyJgJLH/00lWkBpmkBVvbzSygySEBWIlPv8+yARiswioSmw6NI8ZxOYVMJe4fHYGI8QyeYmZ l76zg8zkFLCQOPwxE6JEUOLkzCcsIDYzUEnz1tnMEOV/2SUOLOODsF0kDi1fCRUXlnh1fAs7 hC0l8fndXjYIO1ni0sxzTBB2icTjPQehbHuJ1lP9zCBrmYFeWb9LH2IVn0Tv7ydMIGEJAV6J jjYhiGpFiXuTnkJDR1zi4YwlULaHxPMHj9ghodPNKPHmxWzGCYzys5B8MAvJB7MQti1gZF7F KJlaUJybnlpsWmCUl1oOj9bk/NxNjOB0qeW1g/Hhgw96hxiZOBgPMUpwMCuJ8P4+apgsxJuS WFmVWpQfX1Sak1p8iNEUGMITmaVEk/OBCTuvJN7QxNLAxMzMzMTS2MxQSZx38QytZCGB9MSS 1OzU1ILUIpg+Jg5OqQambcJpVwos11pZeL/t+W+4K2Z31xtV7suHzE89SNdrnGGqfeDN5UAb WZsi3rBnnyr8LtepzjTjrGLYfHrPrt11NzZxt36t7gyTmckcfrRx7bwXp3fdU3/wey7T0ftn cs//Snlwy+KJv3bNma3P9FuPdX4qOt8X7i58YK1F2fMletJ33tdNs/kXIZl/ZHbH8hLZkIlH RHM532a1Nee6W7280JleEWIlOmsr/7RHgavX5IZeWqkW/75207yFj1seNjxpnj3lzp5LKzhZ b3pGz1KP6V1muOX1lLvsv6wWb7fg+t4sxNf+9MO85vdbNCds2xArtLlk31rebXvm7DJf/jzK SPzfKZ5nC9NW1BZ6zvnTOlOJpTgj0VCLuag4EQCDreA4IAQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrELMWRmVeSWpSXmKPExsWy7bCSnO4XM+Nkg7/zDC2aJvxltlh9t5/N 4uaBnUwWK1cfZbJ413qOxeLo/7dsFpMOXWO02HtL22L+sqfsDpwel8+Wemxa1cnmsXlJvcfu mw1sHn1bVjF6fN4kF8AWxWWTkpqTWZZapG+XwJVxZMtExoKPohW3f81ia2D8LtjFyMkhIWAi Mf/OFNYuRi4OIYEdjBL3305jhUiISzRf+8EOYQtLrPz3nB2i6COjxKxTk5i7GDk42AQ0JS5M LgWpEREwk1h6eA0LSA2zwEFGicvPnrCAJIQFoiUaF/5gA7FZBFQlNh2axwxi8wqYS1w+O4MR YoG8xMxL39lBZnIKWEgc/pgJEhYCKtm66QMLRLmgxMmZECOZgcqbt85mnsAoMAtJahaS1AJG plWMkqkFxbnpucWGBUZ5qeV6xYm5xaV56XrJ+bmbGMHBrqW1g3HPqg96hxiZOBgPMUpwMCuJ 8P4+apgsxJuSWFmVWpQfX1Sak1p8iFGag0VJnPdC18l4IYH0xJLU7NTUgtQimCwTB6dUA9OK G+avP2116Tqc8S9+4nyWDB03x898shNXdxYnqO//XLHiX5bqbKOuzU4FAQmpqZ5nnYq2RcaY yE871Ou0x+nNqkLzu+8Stmorx1+smfarT6k71/jotbSz01IPMn2eclZZuXc3S59UwLn53Exa 9q+3idQEczFMMH643ounQW+SxKl766VaxbwaL/BMFDJcbV99+ojc/2o/hctN/B0Krkt5Imwr j0yed295i8KTpaGPDuclhr5ceGBpZ/Nsdr7jkjUR994kvHwg3CL6k6GeZVrV2bPLDU99Fi4W umB8cEP8xeIHnR/vGjyP2msR+UExcYm4lPlsc3Hndd93q9yfKyy9pL2fnze25YF644959Uos xRmJhlrMRcWJAGlfBJTlAgAA X-CMS-MailID: 20220927174628epcas5p21beda845f26eedeb538cb67e286954d4 X-Msg-Generator: CA CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20220927174628epcas5p21beda845f26eedeb538cb67e286954d4 References: <20220927173610.7794-1-joshi.k@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Anuj Gupta Add IORING_URING_CMD_FIXED flag that is to be used for sending io_uring command with previously registered buffers. User-space passes the buffer index in sqe->buf_index, same as done in read/write variants that uses fixed buffers. Signed-off-by: Anuj Gupta Signed-off-by: Kanchan Joshi --- include/linux/io_uring.h | 2 +- include/uapi/linux/io_uring.h | 9 +++++++++ io_uring/uring_cmd.c | 16 +++++++++++++++- 3 files changed, 25 insertions(+), 2 deletions(-) diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h index 1dbf51115c30..e10c5cc81082 100644 --- a/include/linux/io_uring.h +++ b/include/linux/io_uring.h @@ -28,7 +28,7 @@ struct io_uring_cmd { void *cookie; }; u32 cmd_op; - u32 pad; + u32 flags; u8 pdu[32]; /* available inline for free use */ }; diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 92f29d9505a6..ab7458033ee3 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -56,6 +56,7 @@ struct io_uring_sqe { __u32 hardlink_flags; __u32 xattr_flags; __u32 msg_ring_flags; + __u32 uring_cmd_flags; }; __u64 user_data; /* data to be passed back at completion time */ /* pack this to avoid bogus arm OABI complaints */ @@ -219,6 +220,14 @@ enum io_uring_op { IORING_OP_LAST, }; +/* + * sqe->uring_cmd_flags + * IORING_URING_CMD_FIXED use registered buffer; pass thig flag + * along with setting sqe->buf_index. + */ +#define IORING_URING_CMD_FIXED (1U << 0) + + /* * sqe->fsync_flags */ diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c index 6a6d69523d75..faefa9f6f259 100644 --- a/io_uring/uring_cmd.c +++ b/io_uring/uring_cmd.c @@ -4,6 +4,7 @@ #include #include #include +#include #include @@ -77,8 +78,21 @@ int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); - if (sqe->rw_flags || sqe->__pad1) + if (sqe->__pad1) return -EINVAL; + + ioucmd->flags = READ_ONCE(sqe->uring_cmd_flags); + if (ioucmd->flags & IORING_URING_CMD_FIXED) { + struct io_ring_ctx *ctx = req->ctx; + u16 index; + + req->buf_index = READ_ONCE(sqe->buf_index); + if (unlikely(req->buf_index >= ctx->nr_user_bufs)) + return -EFAULT; + index = array_index_nospec(req->buf_index, ctx->nr_user_bufs); + req->imu = ctx->user_bufs[index]; + io_req_set_rsrc_node(req, ctx, 0); + } ioucmd->cmd = sqe->cmd; ioucmd->cmd_op = READ_ONCE(sqe->cmd_op); return 0;