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

From: Eric Dumazet
Date: Wed Jan 22 2014 - 10:30:25 EST


On Wed, 2014-01-22 at 07:11 -0800, 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.
>

Your patch suffers from many problems.

It breaks listen()

It doesn't compile on a lot of arches.

sk_max_ack_backlog is an unsigned short.

max_dgram_qlen is used, but only for Unix sockets at this time
Try : "git grep -n max_dgram_qlen" for details


> 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;
> }


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