This is a note to let you know that I've just added the patch titled net: udp: Add support for getsockopt(..., ..., UDP_GRO, ..., ...); to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: net-udp-add-support-for-getsockopt-.-.-udp_gro.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 23960dbc172a65e328b0d87118eff899caad9b49 Author: Norman Maurer <norman_maurer@xxxxxxxxx> Date: Thu Apr 1 08:59:17 2021 +0200 net: udp: Add support for getsockopt(..., ..., UDP_GRO, ..., ...); [ Upstream commit 98184612aca0a9ee42b8eb0262a49900ee9eef0d ] Support for UDP_GRO was added in the past but the implementation for getsockopt was missed which did lead to an error when we tried to retrieve the setting for UDP_GRO. This patch adds the missing switch case for UDP_GRO Fixes: e20cf8d3f1f7 ("udp: implement GRO for plain UDP sockets.") Signed-off-by: Norman Maurer <norman_maurer@xxxxxxxxx> Reviewed-by: David Ahern <dsahern@xxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 994a150ae3e9..24841a9e9966 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -2692,6 +2692,10 @@ int udp_lib_getsockopt(struct sock *sk, int level, int optname, val = up->gso_size; break; + case UDP_GRO: + val = up->gro_enabled; + break; + /* The following two cannot be changed on UDP sockets, the return is * always 0 (which corresponds to the full checksum coverage of UDP). */ case UDPLITE_SEND_CSCOV: