unimore/kernel-hacking-2024-linux-steffo
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io_uring/net: use ITER_UBUF for single segment send maps

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Just like what is being done on the recv side, if we only map a single
segment, then use ITER_UBUF for mapping it. That's more efficient than
using an ITER_IOVEC.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2024-08-08 10:42:18 -06:00
parent 03e02e8f95
commit 566a424212
1 changed files with 12 additions and 3 deletions
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15
io_uring/net.c
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@ -618,14 +618,23 @@ int io_send(struct io_kiocb *req, unsigned int issue_flags)
if (unlikely(ret < 0))
return ret;
sr->len = arg.out_len;
iov_iter_init(&kmsg->msg.msg_iter, ITER_SOURCE, arg.iovs, ret,
arg.out_len);
if (arg.iovs != &kmsg->fast_iov && arg.iovs != kmsg->free_iov) {
kmsg->free_iov_nr = ret;
kmsg->free_iov = arg.iovs;
req->flags |= REQ_F_NEED_CLEANUP;
}
sr->len = arg.out_len;
if (ret == 1) {
sr->buf = arg.iovs[0].iov_base;
ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len,
&kmsg->msg.msg_iter);
if (unlikely(ret))
return ret;
} else {
iov_iter_init(&kmsg->msg.msg_iter, ITER_SOURCE,
arg.iovs, ret, arg.out_len);
}
}
/*