netdev - Re: [PATCH v3 02/16] e100: Support RXFCS feature flag.

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Message-ID: <CAHXqBFJHoFd5W+YRn9bVg6RsqjFsTdaEM-MMdQjSwVVSckwS=A@mail.gmail.com>
Date:	Sat, 11 Feb 2012 17:07:41 +0100
From:	Michał Mirosław <mirqus@...il.com>
To:	greearb@...delatech.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH v3 02/16] e100: Support RXFCS feature flag.

2012/2/11  <greearb@...delatech.com>:
> From: Ben Greear <greearb@...delatech.com>
[...]
> @@ -1951,9 +1956,11 @@ static int e100_rx_indicate(struct nic *nic, struct rx *rx,
>        }
>
>        /* Get actual data size */
> +       if (unlikely(dev->features & NETIF_F_RXFCS))
> +               fcs_pad = 4;
>        actual_size = le16_to_cpu(rfd->actual_size) & 0x3FFF;
> -       if (unlikely(actual_size > RFD_BUF_LEN - sizeof(struct rfd)))
> -               actual_size = RFD_BUF_LEN - sizeof(struct rfd);
> +       if (unlikely(actual_size > RFD_BUF_LEN + fcs_pad - sizeof(struct rfd)))
> +               actual_size = RFD_BUF_LEN + fcs_pad - sizeof(struct rfd);

BTW, Is this even triggered? I looks like this would indicate
corruption in the descriptor.

Best Regards,
Michał Mirosław
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