netdev - RE: [RFC PATCH] netlink: Increase netlink dump skb message size

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Date:	Tue, 26 Apr 2011 09:24:22 -0700
From:	"Rose, Gregory V" <gregory.v.rose@...el.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"bhutchings@...arflare.com" <bhutchings@...arflare.com>
Subject: RE: [RFC PATCH] netlink: Increase netlink dump skb message size

> -----Original Message-----
> From: Eric Dumazet [mailto:eric.dumazet@...il.com]
> Sent: Tuesday, April 26, 2011 9:21 AM
> To: Rose, Gregory V
> Cc: David Miller; netdev@...r.kernel.org; bhutchings@...arflare.com
> Subject: RE: [RFC PATCH] netlink: Increase netlink dump skb message size
> 
> Le mardi 26 avril 2011 à 09:12 -0700, Rose, Gregory V a écrit :
> 
> > I'm fine with however you folks want to approach this, just give me some
> direction.
> 
> I would just try following patch :

I'll test it out, it's certainly a lot simpler.  Perhaps I was getting a bit too fancy.

Ben would want to make sure it works for 127 VFs, my device does 63.

- Greg

> 
> 
> diff --git a/include/linux/netlink.h b/include/linux/netlink.h
> index 4c4ac3f..22cac81 100644
> --- a/include/linux/netlink.h
> +++ b/include/linux/netlink.h
> @@ -210,6 +210,7 @@ int netlink_sendskb(struct sock *sk, struct sk_buff
> *skb);
>  #else
>  #define NLMSG_GOODSIZE	SKB_WITH_OVERHEAD(8192UL)
>  #endif
> +#define NLMSG_DUMPSIZE SKB_WITH_OVERHEAD(8192UL)
> 
>  #define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)
> 
> diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
> index c8f35b5..cb8d6ac 100644
> --- a/net/netlink/af_netlink.c
> +++ b/net/netlink/af_netlink.c
> @@ -1669,7 +1669,7 @@ static int netlink_dump(struct sock *sk)
>  	struct nlmsghdr *nlh;
>  	int len, err = -ENOBUFS;
> 
> -	skb = sock_rmalloc(sk, NLMSG_GOODSIZE, 0, GFP_KERNEL);
> +	skb = sock_rmalloc(sk, NLMSG_DUMPSIZE, 0, GFP_KERNEL);
>  	if (!skb)
>  		goto errout;
> 
>