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

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Message-Id: <20150312.230348.1911227825204957840.davem@davemloft.net>
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.
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