On 01/22/2014 04:11 PM, Dan Ballard wrote:
Provides a new option for setsockopt SO_MAX_DGRAM_QLEN that sets and
gets a socket specific max datagram queue length. Currently each socket
has one but it's only ever initialized from
/proc/sys/net/unix/max_dgram_qlen and then never adjustable later. Now
each socket can have it individually tweaked during it's life.
Signed-off-by: Dan Ballard <dan@xxxxxxxxxxxx>
---
include/uapi/asm-generic/socket.h | 2 ++
net/core/sock.c | 7 +++++++
2 files changed, 9 insertions(+)
diff --git a/include/uapi/asm-generic/socket.h b/include/uapi/asm-generic/socket.h
index 38f14d0..f8c3e6b 100644
--- a/include/uapi/asm-generic/socket.h
+++ b/include/uapi/asm-generic/socket.h
@@ -80,4 +80,6 @@
#define SO_MAX_PACING_RATE 47
+#define SO_MAX_DGRAM_QLEN 48
+
This needs to be added in more than just asm-generic, e.g.
have a look at SO_MAX_PACING_RATE or SO_BPF_EXTENSIONS.
Also you might need to rebase to current net-next head and
maybe describe use cases more in-depth; next to what Hannes
just commented.
#endif /* __ASM_GENERIC_SOCKET_H */
diff --git a/net/core/sock.c b/net/core/sock.c
index 5393b4b..1ff69d1 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -915,6 +915,10 @@ set_rcvbuf:
sk->sk_max_pacing_rate);
break;
+ case SO_MAX_DGRAM_QLEN:
+ sk->sk_max_ack_backlog = val;
+ break;
+
default:
ret = -ENOPROTOOPT;
break;
@@ -1182,6 +1186,9 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
v.val = sk->sk_max_pacing_rate;
break;
+ case SO_MAX_DGRAM_QLEN:
+ v.val = sk->sk_max_ack_backlog;
+ break;
default:
return -ENOPROTOOPT;
}
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