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From: Pavel Begunkov <[email protected]>
To: [email protected], [email protected],
	[email protected], [email protected]
Cc: Jens Axboe <[email protected]>, Alexei Starovoitov <[email protected]>,
	Daniel Borkmann <[email protected]>,
	Andrii Nakryiko <[email protected]>,
	Martin KaFai Lau <[email protected]>, Song Liu <[email protected]>,
	Yonghong Song <[email protected]>,
	John Fastabend <[email protected]>,
	KP Singh <[email protected]>,
	Horst Schirmeier <[email protected]>,
	"Franz-B . Tuneke" <[email protected]>,
	Christian Dietrich <[email protected]>
Subject: [PATCH 19/23] io_uring: pass user_data to bpf executor
Date: Wed, 19 May 2021 15:13:30 +0100	[thread overview]
Message-ID: <cb4d77ad3165084a9abddf72528c4721d7441888.1621424513.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>

Signed-off-by: Pavel Begunkov <[email protected]>
---
 fs/io_uring.c                 | 16 ++++++++++++++++
 include/uapi/linux/io_uring.h |  4 ++++
 2 files changed, 20 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 7c165b2ce8e4..c37846bca863 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -882,6 +882,7 @@ struct io_defer_entry {
 };
 
 struct io_bpf_ctx {
+	struct io_uring_bpf_ctx u;
 	struct io_ring_ctx	*ctx;
 };
 
@@ -10482,6 +10483,15 @@ static bool io_bpf_is_valid_access(int off, int size,
 				   const struct bpf_prog *prog,
 				   struct bpf_insn_access_aux *info)
 {
+	if (off < 0 || off >= sizeof(struct io_uring_bpf_ctx))
+		return false;
+	if (off % size != 0)
+		return false;
+
+	switch (off) {
+	case offsetof(struct io_uring_bpf_ctx, user_data):
+		return size == sizeof_field(struct io_uring_bpf_ctx, user_data);
+	}
 	return false;
 }
 
@@ -10505,6 +10515,8 @@ static void io_bpf_run(struct io_kiocb *req, unsigned int issue_flags)
 		     atomic_read(&req->task->io_uring->in_idle)))
 		goto done;
 
+	memset(&bpf_ctx.u, 0, sizeof(bpf_ctx.u));
+	bpf_ctx.u.user_data = req->user_data;
 	bpf_ctx.ctx = ctx;
 	prog = req->bpf.prog;
 
@@ -10591,6 +10603,10 @@ static int __init io_uring_init(void)
 	BUILD_BUG_SQE_ELEM(44, __s32,  splice_fd_in);
 	BUILD_BUG_SQE_ELEM(48, __u16,  cq_idx);
 
+	/* should be first, see io_bpf_is_valid_access() */
+	__BUILD_BUG_VERIFY_ELEMENT(struct io_bpf_ctx, 0,
+				   struct io_uring_bpf_ctx, u);
+
 	BUILD_BUG_ON(sizeof(struct io_uring_files_update) !=
 		     sizeof(struct io_uring_rsrc_update));
 	BUILD_BUG_ON(sizeof(struct io_uring_rsrc_update) >
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index 25ab804670e1..d7b1713bcfb0 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -403,4 +403,8 @@ struct io_uring_getevents_arg {
 	__u64	ts;
 };
 
+struct io_uring_bpf_ctx {
+	__u64	user_data;
+};
+
 #endif
-- 
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 ` [PATCH 11/23] io_uring: enable mmap'ing additional CQs Pavel Begunkov
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 ` Pavel Begunkov [this message]
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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