[PATCH 1/1] Per socket value for max datagram queue length

[Dan Ballard <dan@xxxxxxxxxxxx>]

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
+
 #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;
        }
--
1.7.10.4
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