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authorPavel Begunkov <asml.silence@gmail.com>2022-08-26 17:15:47 +0100
committerJens Axboe <axboe@kernel.dk>2022-08-26 10:31:42 -0600
commitdfb58b1796d19c8405a38eb457f97669440c59d4 (patch)
tree2eb07c0a8818e7c181983fb952ba6c4934a247ef /io_uring
parent581711c46612c1fd7f98960f9ad53f04fdb89853 (diff)
downloadlinux-dfb58b1796d19c8405a38eb457f97669440c59d4.tar.bz2
io_uring/net: fix overexcessive retries
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: 3ff1a0d395c00 ("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>
Diffstat (limited to 'io_uring')
-rw-r--r--io_uring/net.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/io_uring/net.c b/io_uring/net.c
index 0af8a02df580..7a5468cc905e 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -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;