udp: Add support for getsockopt(..., ..., UDP_GRO, ..., ...);

From: Norman Maurer <hidden>
Date: 2021-03-25 21:50:44
Also in: lkml
Subsystem: networking [general], the rest, user datagram protocol (udp) · Maintainers: "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Willem de Bruijn

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 <redacted>
---
 net/ipv4/udp.c | 4 ++++
 1 file changed, 4 insertions(+)
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 4a0478b17243..99d743eb9dc4 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2754,6 +2754,10 @@ 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:
--
2.29.2
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