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From: Pavel Begunkov <asml.silence@gmail.com>
To: io-uring@vger.kernel.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>, Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>,
	Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
	Yonghong Song <yhs@fb.com>,
	John Fastabend <john.fastabend@gmail.com>,
	KP Singh <kpsingh@kernel.org>,
	Horst Schirmeier <horst.schirmeier@tu-dortmund.de>,
	"Franz-B . Tuneke" <franz-bernhard.tuneke@tu-dortmund.de>,
	Christian Dietrich <stettberger@dokucode.de>
Subject: [PATCH 11/23] io_uring: enable mmap'ing additional CQs
Date: Wed, 19 May 2021 15:13:22 +0100	[thread overview]
Message-ID: <0b54c7e684a2a9c3cb1a3cddfe48790e79bfbb89.1621424513.git.asml.silence@gmail.com> (raw)
In-Reply-To: <cover.1621424513.git.asml.silence@gmail.com>

TODO: get rid of extra offset

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 fs/io_uring.c                 | 13 ++++++++++++-
 include/uapi/linux/io_uring.h |  2 ++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 067cfb3a6e4a..1a4c9e513ac9 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -9207,6 +9207,7 @@ static void *io_uring_validate_mmap_request(struct file *file,
 	struct io_ring_ctx *ctx = file->private_data;
 	loff_t offset = pgoff << PAGE_SHIFT;
 	struct page *page;
+	unsigned long cq_idx;
 	void *ptr;
 
 	switch (offset) {
@@ -9218,7 +9219,15 @@ static void *io_uring_validate_mmap_request(struct file *file,
 		ptr = ctx->sq_sqes;
 		break;
 	default:
-		return ERR_PTR(-EINVAL);
+		if (offset < IORING_OFF_CQ_RING_EXTRA)
+			return ERR_PTR(-EINVAL);
+		offset -= IORING_OFF_CQ_RING_EXTRA;
+		if (offset % IORING_STRIDE_CQ_RING)
+			return ERR_PTR(-EINVAL);
+		cq_idx = offset / IORING_STRIDE_CQ_RING;
+		if (cq_idx >= ctx->cq_nr)
+			return ERR_PTR(-EINVAL);
+		ptr = ctx->cqs[cq_idx].rings;
 	}
 
 	page = virt_to_head_page(ptr);
@@ -9615,6 +9624,8 @@ static int io_allocate_scq_urings(struct io_ring_ctx *ctx,
 
 	return 0;
 err:
+	while (ctx->cq_nr > 1)
+		io_mem_free(ctx->cqs[--ctx->cq_nr].rings);
 	io_mem_free(ctx->rings);
 	ctx->rings = NULL;
 	return ret;
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index 92b61ca09ea5..67a97c793de7 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -203,6 +203,8 @@ enum {
 #define IORING_OFF_SQ_RING		0ULL
 #define IORING_OFF_CQ_RING		0x8000000ULL
 #define IORING_OFF_SQES			0x10000000ULL
+#define IORING_OFF_CQ_RING_EXTRA	0x1200000ULL
+#define IORING_STRIDE_CQ_RING		0x0100000ULL
 
 /*
  * Filled with the offset for mmap(2)
-- 
2.31.1


  parent reply	other threads:[~2021-05-19 14:15 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-19 14:13 [RFC v2 00/23] io_uring BPF requests Pavel Begunkov
2021-05-19 14:13 ` [PATCH 01/23] io_uring: shuffle rarely used ctx fields Pavel Begunkov
2021-05-20 21:46   ` Song Liu
2021-05-20 22:46     ` Pavel Begunkov
2021-05-19 14:13 ` [PATCH 02/23] io_uring: localise fixed resources fields Pavel Begunkov
2021-05-19 14:13 ` [PATCH 03/23] io_uring: remove dependency on ring->sq/cq_entries Pavel Begunkov
2021-05-19 14:13 ` [PATCH 04/23] io_uring: deduce cq_mask from cq_entries Pavel Begunkov
2021-05-19 14:13 ` [PATCH 05/23] io_uring: kill cached_cq_overflow Pavel Begunkov
2021-05-19 14:13 ` [PATCH 06/23] io_uring: rename io_get_cqring Pavel Begunkov
2021-05-19 14:13 ` [PATCH 07/23] io_uring: extract struct for CQ Pavel Begunkov
2021-05-19 14:13 ` [PATCH 08/23] io_uring: internally pass CQ indexes Pavel Begunkov
2021-05-19 14:13 ` [PATCH 09/23] io_uring: extract cq size helper Pavel Begunkov
2021-05-19 14:13 ` [PATCH 10/23] io_uring: add support for multiple CQs Pavel Begunkov
2021-05-19 14:13 ` Pavel Begunkov [this message]
2021-05-19 14:13 ` [PATCH 12/23] bpf: add IOURING program type Pavel Begunkov
2021-05-20 23:34   ` Song Liu
2021-05-21  0:56     ` Pavel Begunkov
2021-05-19 14:13 ` [PATCH 13/23] io_uring: implement bpf prog registration Pavel Begunkov
2021-05-20 23:45   ` Song Liu
2021-05-21  0:43     ` Pavel Begunkov
2021-05-19 14:13 ` [PATCH 14/23] io_uring: add support for bpf requests Pavel Begunkov
2021-05-21  0:42   ` Pavel Begunkov
2021-05-19 14:13 ` [PATCH 15/23] io_uring: enable BPF to submit SQEs Pavel Begunkov
2021-05-21  0:06   ` Song Liu
2021-05-21  1:07   ` Alexei Starovoitov
2021-05-21  9:33     ` Pavel Begunkov
2021-05-19 14:13 ` [PATCH 16/23] io_uring: enable bpf to submit CQEs Pavel Begunkov
2021-05-19 14:13 ` [PATCH 17/23] io_uring: enable bpf to reap CQEs Pavel Begunkov
2021-05-19 14:13 ` [PATCH 18/23] libbpf: support io_uring Pavel Begunkov
2021-05-19 17:38   ` Andrii Nakryiko
2021-05-20  9:58     ` Pavel Begunkov
2021-05-20 17:23       ` Andrii Nakryiko
2021-05-19 14:13 ` [PATCH 19/23] io_uring: pass user_data to bpf executor Pavel Begunkov
2021-05-19 14:13 ` [PATCH 20/23] bpf: Add bpf_copy_to_user() helper Pavel Begunkov
2021-05-19 14:13 ` [PATCH 21/23] io_uring: wire bpf copy to user Pavel Begunkov
2021-05-19 14:13 ` [PATCH 22/23] io_uring: don't wait on CQ exclusively Pavel Begunkov
2021-05-19 14:13 ` [PATCH 23/23] io_uring: enable bpf reqs to wait for CQs Pavel Begunkov
2021-05-21  0:35 ` [RFC v2 00/23] io_uring BPF requests Song Liu
2021-05-21  0:58   ` Pavel Begunkov

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