netdev - Re: [PATCH net-next] net: bcmgenet: rewrite bcmgenet_rx

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 12 Mar 2015 23:03:48 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	pgynther@...gle.com
Cc:	netdev@...r.kernel.org, f.fainelli@...il.com, jaedon.shin@...il.com
Subject: Re: [PATCH net-next] net: bcmgenet: rewrite bcmgenet_rx_refill()

From: Petri Gynther <pgynther@...gle.com>
Date: Thu, 12 Mar 2015 15:48:00 -0700 (PDT)

> Currently, bcmgenet_desc_rx() calls bcmgenet_rx_refill() at the end of
> Rx packet processing loop, after the current Rx packet has already been
> passed to napi_gro_receive(). However, bcmgenet_rx_refill() might fail
> to allocate a new Rx skb, thus leaving a hole on the Rx queue where no
> valid Rx buffer exists.
> 
> To eliminate this situation:
> 1. Rewrite bcmgenet_rx_refill() to retain the current Rx skb on the Rx
>    queue if a new replacement Rx skb can't be allocated and DMA-mapped.
>    In this case, the data on the current Rx skb is effectively dropped.
> 2. Modify bcmgenet_desc_rx() to call bcmgenet_rx_refill() at the top of
>    Rx packet processing loop, so that the new replacement Rx skb is
>    already in place before the current Rx skb is processed.
> 
> Signed-off-by: Petri Gynther <pgynther@...gle.com>

I'll apply this after Florian reports back about his testing.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html