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Fri, 9 Sep 2022 19:31:41 +0900 (KST) Received: from epsmtrp1.samsung.com (unknown [182.195.40.13]) by epcas5p3.samsung.com (KnoxPortal) with ESMTPA id 20220909103140epcas5p36689726422eb68e6fdc1d39019a4a8ba~TKpOXl-Tg0115401154epcas5p3t; Fri, 9 Sep 2022 10:31:40 +0000 (GMT) Received: from epsmgms1p2.samsung.com (unknown [182.195.42.42]) by epsmtrp1.samsung.com (KnoxPortal) with ESMTP id 20220909103140epsmtrp10cbe43d34e34eda09f4f9937a1be9067~TKpOW1iFy1097010970epsmtrp1I; Fri, 9 Sep 2022 10:31:40 +0000 (GMT) X-AuditID: b6c32a49-dfdff7000000e8f1-a3-631b160d52f6 Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgms1p2.samsung.com (Symantec Messaging Gateway) with SMTP id AB.B1.18644.C061B136; Fri, 9 Sep 2022 19:31:40 +0900 (KST) Received: from localhost.localdomain (unknown [107.110.206.5]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20220909103139epsmtip121b3208ae6a042f2e54c7e62b02f37d1~TKpM5TZXh1205712057epsmtip1W; Fri, 9 Sep 2022 10:31:39 +0000 (GMT) From: Kanchan Joshi To: axboe@kernel.dk, hch@lst.de, kbusch@kernel.org, asml.silence@gmail.com 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 v7 2/5] io_uring: introduce fixed buffer support for io_uring_cmd Date: Fri, 9 Sep 2022 15:51:33 +0530 Message-Id: <20220909102136.3020-3-joshi.k@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220909102136.3020-1-joshi.k@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprOJsWRmVeSWpSXmKPExsWy7bCmui6vmHSywcGTlhZNE/4yW8xZtY3R YvXdfjaLmwd2MlmsXH2UyeJd6zkWi6P/37JZTDp0jdFi7y1ti/nLnrI7cHnsnHWX3ePy2VKP Tas62Tw2L6n32H2zgc2jb8sqRo/Pm+QC2KOybTJSE1NSixRS85LzUzLz0m2VvIPjneNNzQwM dQ0tLcyVFPISc1NtlVx8AnTdMnOAjlNSKEvMKQUKBSQWFyvp29kU5ZeWpCpk5BeX2CqlFqTk FJgU6BUn5haX5qXr5aWWWBkaGBiZAhUmZGc8/d7IUvBRtGLRGfUGxu+CXYycHBICJhL7jz1j 7mLk4hAS2M0osXb3XlYI5xOjxPKfR5kgnM+MEvu7ZzDCtDx5txCqahejROv0L8wgCbCquaf0 uxg5ONgENCUuTC4FCYsIeEncv/0erJ4ZZMXbG43sIAlhgRiJpZd2sIDYLAKqEpv2fmADsXkF zCXOL29ig1gmLzHz0newek4BC4nJn6+xQ9QISpyc+QSslxmopnnrbLAfJARaOSSmzXzHAtHs IrF421tmCFtY4tXxLewQtpTEy/42KDtZ4tLMc0wQdonE4z0HoWx7idZT/cwgzzADPbN+lz7E Lj6J3t9PmEDCEgK8Eh1tQhDVihL3Jj1lhbDFJR7OWAJle0g8XHmTFRI83YwSX55VTGCUn4Xk g1lIPpiFsGwBI/MqRsnUguLc9NRi0wLDvNRyeLQm5+duYgSnUC3PHYx3H3zQO8TIxMF4iFGC g1lJhFd0rUSyEG9KYmVValF+fFFpTmrxIUZTYBBPZJYSTc4HJvG8knhDE0sDEzMzMxNLYzND JXHeKdqMyUIC6YklqdmpqQWpRTB9TBycUg1MxecuL+VSWxm16lq/61+xJ/cmztv+/1nhntXC 13y+u34SeeXazfR79Y/meTtWaeZkWRhMUi6cop/U9jvl99vlGi/m9xZczOTIdjdW1yz5Nmlj Rmlh9mof4+vPl0o6SEhYtZ5y/nj/4wWmz+nfvrRvfb28tFaY5/rahRPlDK0u/F7irS+2UJNv s1CK2Z3chvalJoJ7Ckw1FkycsWelOfeZzc9fG16tVdboiUl8/uDTl49JKbHTluusvz15/79l JyQ36y0tOqabdZf19M5cjn9+okr/zny7fs+fp1bk8+zdXetfOoa9mLgxoq5i/fbHMVfvXH18 1/XcDvHQ7wXsx/2cNx2QaLop2vz8PbOCd/l7r/1KLMUZiYZazEXFiQC9OwsYKgQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrDLMWRmVeSWpSXmKPExsWy7bCSnC6PmHSyQedpHYumCX+ZLeas2sZo sfpuP5vFzQM7mSxWrj7KZPGu9RyLxdH/b9ksJh26xmix95a2xfxlT9kduDx2zrrL7nH5bKnH plWdbB6bl9R77L7ZwObRt2UVo8fnTXIB7FFcNimpOZllqUX6dglcGU+/N7IUfBStWHRGvYHx u2AXIyeHhICJxJN3C1m7GLk4hAR2MEo8nbGRFSIhLtF87Qc7hC0ssfLfc3aIoo+MEg/OHwUq 4uBgE9CUuDC5FKRGRCBA4mDjZbAaZoGDjBKXnz1hAUkIC0RJ9EyZxAhiswioSmza+4ENxOYV MJc4v7yJDWKBvMTMS9/BlnEKWEhM/nwNzBYCqnm98xMLRL2gxMmZEDOZgeqbt85mnsAoMAtJ ahaS1AJGplWMkqkFxbnpucWGBUZ5qeV6xYm5xaV56XrJ+bmbGMERoKW1g3HPqg96hxiZOBgP MUpwMCuJ8IqulUgW4k1JrKxKLcqPLyrNSS0+xCjNwaIkznuh62S8kEB6YklqdmpqQWoRTJaJ g1Oqgcn/6kHPABcTq/VbVpROfbxp4Uyz/y/LjptbObAK6rJr5nIvm++4piekyK/X4IA0hwq3 I9POWdu7nSqNgyal35/xYftFaSv1spOHY/5xGL2zNtnzI4O7Qs5JKV9kaan+/U8Jfw/cNU66 GS/c+4szt+WCTl/LUaV5hrvNV+7ZtFwydhnXrucXhS+W9V27XBlzYenZqJzuAIffe92CHKZO Pu19IPj7l5rHhaEi4dIPW16/8px5+KbRBSXet5lr+h9GdUUzRHrPVUzdWvBBaLXYuoa1jBl1 wqkJQWzXOLWO6MiVr9PlielMiWy5ldwhmRJ57WpkqdCuyKxY++uirBOe/xf03zv3+KfvBwo3 Kx4MV2Ipzkg01GIuKk4EAFoXtrzvAgAA X-CMS-MailID: 20220909103140epcas5p36689726422eb68e6fdc1d39019a4a8ba X-Msg-Generator: CA CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20220909103140epcas5p36689726422eb68e6fdc1d39019a4a8ba References: <20220909102136.3020-1-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 972b179bc07a..f94f377f2ae6 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 */ @@ -218,6 +219,14 @@ 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;