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

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Date:	Wed, 22 Jan 2014 07:30:14 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Dan Ballard <dan@...dstab.net>
Cc:	Lennart Poettering <lennart@...ttering.net>, kay.sievers@...y.org,
	Arnd Bergmann <arnd@...db.de>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Eliezer Tamir <eliezer.tamir@...ux.intel.com>,
	Neil Horman <nhorman@...driver.com>,
	Li Zefan <lizefan@...wei.com>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/1] Per socket value for max datagram queue length

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@...dstab.net>
> ---
>   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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