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| author |   Luke Hsiao <lukehsiao@google.com> | 2020-08-21 21:41:05 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2020-08-24 16:16:06 -0700 |
| commit | 901341bb9718884f337a92e6c4541227597d1f48 (patch) | |
| tree | f9e5675fe92fc9074cad0ff0bbe763ed9ba7c7de /net/ipv4/tcp_scalable.c | |
| parent | io_uring: allow tcp ancillary data for __sys_recvmsg_sock() (diff) | |
| download | linux-dev-901341bb9718884f337a92e6c4541227597d1f48.tar.xz linux-dev-901341bb9718884f337a92e6c4541227597d1f48.zip | |
io_uring: ignore POLLIN for recvmsg on MSG_ERRQUEUE
Currently, io_uring's recvmsg subscribes to both POLLERR and POLLIN. In
the context of TCP tx zero-copy, this is inefficient since we are only
reading the error queue and not using recvmsg to read POLLIN responses.
This patch was tested by using a simple sending program to call recvmsg
using io_uring with MSG_ERRQUEUE set and verifying with printks that the
POLLIN is correctly unset when the msg flags are MSG_ERRQUEUE.
Signed-off-by: Arjun Roy <arjunroy@google.com>
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Luke Hsiao <lukehsiao@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_scalable.c')
0 files changed, 0 insertions, 0 deletions