netdev - Re: [RFC 2/2] e1000e: Support RXALL feature flag.

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Message-ID: <CAHXqBFJ9=fXYuzZd0SM0hGsDxQee5UPzOwThbxNkks03VLFunw@mail.gmail.com>
Date:	Wed, 8 Feb 2012 01:06:42 +0100
From:	Michał Mirosław <mirqus@...il.com>
To:	greearb@...delatech.com
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC 2/2] e1000e: Support RXALL feature flag.

2012/2/8  <greearb@...delatech.com>:
> From: Ben Greear <greearb@...delatech.com>
>
> This allows the NIC to receive all frames available, including
> those with bad FCS, un-matched vlans, ethernet control frames,
> and more.
>
> Tested by sending frames with bad FCS.

This should probably mark the bad packets somehow, so they are not
passed up the stack and mixed with correct traffic.

[...]
> @@ -2996,6 +3001,25 @@ static void e1000_setup_rctl(struct e1000_adapter *adapter)
>                ew32(PSRCTL, psrctl);
>        }
>
> +       /* This is useful for sniffing bad packets. */
> +       if (adapter->netdev->features & NETIF_F_RXALL) {
> +               rctl |= (E1000_RCTL_SBP | /* Receive bad packets */
> +                        E1000_RCTL_UPE | /* RX all Unicast Pkts */
> +                        E1000_RCTL_MPE | /* RX all Mcast Pkts */
> +                        E1000_RCTL_BAM | /* RX All Bcast Pkts Pkts */
> +                        E1000_RCTL_PMCF); /* RX All MAC Ctrl Pkts */
> +
> +               rctl &= ~(E1000_RCTL_VFE | /* Disable VLAN filter */
> +                         E1000_RCTL_DPF | /* Allow filtered pause */
> +                         E1000_RCTL_CFIEN); /* Dis VLAN CFIEN Filter */
> +               /* disable VLAN tagging/striping */
> +               /* SKIP This, it also affects transmit side and
> +                  screws up VLANs --Ben. */
> +               /* ctrl = er32(CTRL); */
> +               /* ctrl &= ~E1000_CTRL_VME; */
> +               /* ew32(CTRL, ctrl); */
> +       }
> +
[...]

Looks like it can be enabled independently of promisc mode: rx-all +
no-promisc would receive only bad packets destined for this host.

Best Regards,
Michał Mirosław
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