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io_uring/net: implement vectored reg bufs for zctx 

Add support for vectored registered buffers for send zc.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/e484052875f862d2dca99f0f8c04407c1d51a1c1.1741362889.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2025-03-07 16:00:36 +00:00 committed by Jens Axboe
parent be7052a4b5
commit 23371eac7d
1 changed files with 55 additions and 4 deletions
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59
io_uring/net.c
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@ -395,6 +395,44 @@ static int io_sendmsg_setup(struct io_kiocb *req, const struct io_uring_sqe *sqe
return io_sendmsg_copy_hdr(req, kmsg);
}
static int io_sendmsg_zc_setup(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
struct io_async_msghdr *kmsg = req->async_data;
struct user_msghdr msg;
int ret, iovec_off;
struct iovec *iov;
void *res;
if (!(sr->flags & IORING_RECVSEND_FIXED_BUF))
return io_sendmsg_setup(req, sqe);
sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
ret = io_msg_copy_hdr(req, kmsg, &msg, ITER_SOURCE, NULL);
if (unlikely(ret))
return ret;
sr->msg_control = kmsg->msg.msg_control_user;
if (msg.msg_iovlen > kmsg->vec.nr || WARN_ON_ONCE(!kmsg->vec.iovec)) {
ret = io_vec_realloc(&kmsg->vec, msg.msg_iovlen);
if (ret)
return ret;
req->flags |= REQ_F_NEED_CLEANUP;
}
iovec_off = kmsg->vec.nr - msg.msg_iovlen;
iov = kmsg->vec.iovec + iovec_off;
res = iovec_from_user(msg.msg_iov, msg.msg_iovlen, kmsg->vec.nr, iov,
io_is_compat(req->ctx));
if (IS_ERR(res))
return PTR_ERR(res);
kmsg->msg.msg_iter.nr_segs = msg.msg_iovlen;
req->flags |= REQ_F_IMPORT_BUFFER;
return ret;
}
#define SENDMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_BUNDLE)
int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
@ -1333,8 +1371,6 @@ int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
if (req->opcode != IORING_OP_SEND_ZC) {
if (unlikely(sqe->addr2 || sqe->file_index))
return -EINVAL;
if (unlikely(zc->flags & IORING_RECVSEND_FIXED_BUF))
return -EINVAL;
}
zc->len = READ_ONCE(sqe->len);
@ -1350,7 +1386,7 @@ int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return -ENOMEM;
if (req->opcode != IORING_OP_SENDMSG_ZC)
return io_send_setup(req, sqe);
return io_sendmsg_setup(req, sqe);
return io_sendmsg_zc_setup(req, sqe);
}
static int io_sg_from_iter_iovec(struct sk_buff *skb,
@ -1506,6 +1542,22 @@ int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags)
unsigned flags;
int ret, min_ret = 0;
kmsg->msg.sg_from_iter = io_sg_from_iter_iovec;
if (req->flags & REQ_F_IMPORT_BUFFER) {
unsigned uvec_segs = kmsg->msg.msg_iter.nr_segs;
unsigned iovec_off = kmsg->vec.nr - uvec_segs;
int ret;
ret = io_import_reg_vec(ITER_SOURCE, &kmsg->msg.msg_iter, req,
&kmsg->vec, uvec_segs, iovec_off,
issue_flags);
if (unlikely(ret))
return ret;
kmsg->msg.sg_from_iter = io_sg_from_iter;
req->flags &= ~REQ_F_IMPORT_BUFFER;
}
sock = sock_from_file(req->file);
if (unlikely(!sock))
return -ENOTSOCK;
@ -1524,7 +1576,6 @@ int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags)
kmsg->msg.msg_control_user = sr->msg_control;
kmsg->msg.msg_ubuf = &io_notif_to_data(sr->notif)->uarg;
kmsg->msg.sg_from_iter = io_sg_from_iter_iovec;
ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags);
if (unlikely(ret < min_ret)) {