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io_uring/net: fix overexcessive retries

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Length parameter of io_sg_from_iter() can be smaller than the iterator's
size, as it's with TCP, so when we set from->count at the end of the
function we truncate the iterator forcing TCP to return preliminary with
a short send. It affects zerocopy sends with large payload sizes and
leads to retries and possible request failures.

Fixes: 3ff1a0d395 ("io_uring: enable managed frags with register buffers")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/0bc0d5179c665b4ef5c328377c84c7a1f298467e.1661530037.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-08-26 17:15:47 +01:00 committed by Jens Axboe
parent 581711c466
commit dfb58b1796
1 changed files with 1 additions and 1 deletions
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io_uring/net.c
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@ -956,7 +956,7 @@ static int io_sg_from_iter(struct sock *sk, struct sk_buff *skb,
shinfo->nr_frags = frag;
from->bvec += bi.bi_idx;
from->nr_segs -= bi.bi_idx;
from->count = bi.bi_size;
from->count -= copied;
from->iov_offset = bi.bi_bvec_done;
skb->data_len += copied;