netdev - Re: regression: tethering fails in 3.5 with iwlwifi

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Message-ID: <1348147322.31352.69.camel@edumazet-glaptop>
Date:	Thu, 20 Sep 2012 15:22:02 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	artem.bityutskiy@...ux.intel.com
Cc:	Eric Dumazet <edumazet@...gle.com>,
	Johannes Berg <johannes@...solutions.net>,
	linux-wireless@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: regression: tethering fails in 3.5 with iwlwifi

On Thu, 2012-09-20 at 16:22 +0300, Artem Bityutskiy wrote:

> 
> OK, I've tried almost this (see below) and it solves my issue:
> 
> diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
> index 965e6ec..7f079d0 100644
> --- a/net/mac80211/rx.c
> +++ b/net/mac80211/rx.c
> @@ -1798,9 +1798,13 @@ ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
>  
>                 if (skb) {
>                         /* deliver to local stack */
> -                       skb->protocol = eth_type_trans(skb, dev);
> -                       memset(skb->cb, 0, sizeof(skb->cb));
> -                       netif_receive_skb(skb);
> +                       if (pskb_may_pull(skb, 40)) {
> +                               skb->protocol = eth_type_trans(skb, dev);
> +                               memset(skb->cb, 0, sizeof(skb->cb));
> +                               netif_receive_skb(skb);
> +                       } else {
> +                               kfree_skb(skb);
> +                       }
>                 }
>         }
> 

OK but you cant do that, or small frames will be dropped.

Anyway its a hack, we should find the buggy layer.

You could use dropwatch (drop_monitor) to check where frame is dropped.

modprobe drop_monitor
dropwatch -l kas



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