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io_uring/msg_ring: Pass custom flags to the cqe 

This patch adds a new flag (IORING_MSG_RING_FLAGS_PASS) in the message
ring operations (IORING_OP_MSG_RING). This new flag enables the sender
to specify custom flags, which will be copied over to cqe->flags in the
receiving ring.  These custom flags should be specified using the
sqe->file_index field.

This mechanism provides additional flexibility when sending messages
between rings.

Signed-off-by: Breno Leitao <leitao@debian.org>
Link: https://lore.kernel.org/r/20230103160507.617416-1-leitao@debian.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Breno Leitao 2023-01-03 08:05:07 -08:00 committed by Jens Axboe
parent d33a39e577
commit cbeb47a7b5
2 changed files with 21 additions and 5 deletions
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2
include/uapi/linux/io_uring.h
View File

@ -347,6 +347,8 @@ enum {
* applicable for IORING_MSG_DATA, obviously.
*/
#define IORING_MSG_RING_CQE_SKIP (1U << 0)
/* Pass through the flags from sqe->file_index to cqe->flags */
#define IORING_MSG_RING_FLAGS_PASS (1U << 1)
/*
* IO completion data structure (Completion Queue Entry)

24
io_uring/msg_ring.c
View File

@ -13,6 +13,11 @@
#include "filetable.h"
#include "msg_ring.h"
/* All valid masks for MSG_RING */
#define IORING_MSG_RING_MASK (IORING_MSG_RING_CQE_SKIP | \
IORING_MSG_RING_FLAGS_PASS)
struct io_msg {
struct file *file;
struct file *src_file;
@ -21,7 +26,10 @@ struct io_msg {
u32 len;
u32 cmd;
u32 src_fd;
u32 dst_fd;
union {
u32 dst_fd;
u32 cqe_flags;
};
u32 flags;
};
@ -114,9 +122,12 @@ static int io_msg_ring_data(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_ring_ctx *target_ctx = req->file->private_data;
struct io_msg *msg = io_kiocb_to_cmd(req, struct io_msg);
u32 flags = 0;
int ret;
if (msg->src_fd || msg->dst_fd || msg->flags)
if (msg->src_fd || msg->flags & ~IORING_MSG_RING_FLAGS_PASS)
return -EINVAL;
if (!(msg->flags & IORING_MSG_RING_FLAGS_PASS) && msg->dst_fd)
return -EINVAL;
if (target_ctx->flags & IORING_SETUP_R_DISABLED)
return -EBADFD;
@ -124,15 +135,18 @@ static int io_msg_ring_data(struct io_kiocb *req, unsigned int issue_flags)
if (io_msg_need_remote(target_ctx))
return io_msg_exec_remote(req, io_msg_tw_complete);
if (msg->flags & IORING_MSG_RING_FLAGS_PASS)
flags = msg->cqe_flags;
ret = -EOVERFLOW;
if (target_ctx->flags & IORING_SETUP_IOPOLL) {
if (unlikely(io_double_lock_ctx(target_ctx, issue_flags)))
return -EAGAIN;
if (io_post_aux_cqe(target_ctx, msg->user_data, msg->len, 0))
if (io_post_aux_cqe(target_ctx, msg->user_data, msg->len, flags))
ret = 0;
io_double_unlock_ctx(target_ctx);
} else {
if (io_post_aux_cqe(target_ctx, msg->user_data, msg->len, 0))
if (io_post_aux_cqe(target_ctx, msg->user_data, msg->len, flags))
ret = 0;
}
return ret;
@ -241,7 +255,7 @@ int io_msg_ring_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
msg->src_fd = READ_ONCE(sqe->addr3);
msg->dst_fd = READ_ONCE(sqe->file_index);
msg->flags = READ_ONCE(sqe->msg_ring_flags);
if (msg->flags & ~IORING_MSG_RING_CQE_SKIP)
if (msg->flags & ~IORING_MSG_RING_MASK)
return -EINVAL;
return 0;