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io_uring: Introduce IORING_OP_LISTEN

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IORING_OP_LISTEN provides the semantic of listen(2) via io_uring.  While
this is an essentially synchronous system call, the main point is to
enable a network path to execute fully with io_uring registered and
descriptorless files.

Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
Link: https://lore.kernel.org/r/20240614163047.31581-4-krisman@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Gabriel Krisman Bertazi 2024-06-14 12:30:47 -04:00 committed by Jens Axboe
parent 7481fd93fa
commit ff140cc862
4 changed files with 45 additions and 0 deletions
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1
include/uapi/linux/io_uring.h
View file

@ -258,6 +258,7 @@ enum io_uring_op {
IORING_OP_FIXED_FD_INSTALL,
IORING_OP_FTRUNCATE,
IORING_OP_BIND,
IORING_OP_LISTEN,
/* this goes last, obviously */
IORING_OP_LAST,

28
io_uring/net.c
View file

@ -56,6 +56,11 @@ struct io_bind {
int addr_len;
};
struct io_listen {
struct file *file;
int backlog;
};
struct io_sr_msg {
struct file *file;
union {
@ -1751,6 +1756,29 @@ int io_bind(struct io_kiocb *req, unsigned int issue_flags)
return 0;
}
int io_listen_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_listen *listen = io_kiocb_to_cmd(req, struct io_listen);
if (sqe->addr || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in || sqe->addr2)
return -EINVAL;
listen->backlog = READ_ONCE(sqe->len);
return 0;
}
int io_listen(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_listen *listen = io_kiocb_to_cmd(req, struct io_listen);
int ret;
ret = __sys_listen_socket(sock_from_file(req->file), listen->backlog);
if (ret < 0)
req_set_fail(req);
io_req_set_res(req, ret, 0);
return 0;
}
void io_netmsg_cache_free(const void *entry)
{
struct io_async_msghdr *kmsg = (struct io_async_msghdr *) entry;

3
io_uring/net.h
View file

@ -52,6 +52,9 @@ void io_send_zc_cleanup(struct io_kiocb *req);
int io_bind_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_bind(struct io_kiocb *req, unsigned int issue_flags);
int io_listen_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_listen(struct io_kiocb *req, unsigned int issue_flags);
void io_netmsg_cache_free(const void *entry);
#else
static inline void io_netmsg_cache_free(const void *entry)

13
io_uring/opdef.c
View file

@ -503,6 +503,16 @@ const struct io_issue_def io_issue_defs[] = {
.async_size = sizeof(struct io_async_msghdr),
#else
.prep = io_eopnotsupp_prep,
#endif
},
[IORING_OP_LISTEN] = {
#if defined(CONFIG_NET)
.needs_file = 1,
.prep = io_listen_prep,
.issue = io_listen,
.async_size = sizeof(struct io_async_msghdr),
#else
.prep = io_eopnotsupp_prep,
#endif
},
};
@ -729,6 +739,9 @@ const struct io_cold_def io_cold_defs[] = {
[IORING_OP_BIND] = {
.name = "BIND",
},
[IORING_OP_LISTEN] = {
.name = "LISTEN",
},
};
const char *io_uring_get_opcode(u8 opcode)