netdev - Re: expected behavior of PF_PACKET on NETIF_F_HW_VLAN

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Message-Id: <20071101.145828.36424380.davem@davemloft.net>
Date:	Thu, 01 Nov 2007 14:58:28 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	djohnson+linux-kernel@...starentnetworks.com
Cc:	greearb@...delatech.com, shemminger@...ux-foundation.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	bguo@...starentnetworks.com
Subject: Re: expected behavior of PF_PACKET on NETIF_F_HW_VLAN_RX device?

From: Dave Johnson <djohnson+linux-kernel@...starentnetworks.com>
Date: Thu, 1 Nov 2007 17:36:22 -0400

> bad csum on tx packets as reported by tcpdump is also an issue.

We provide a tag to userspace that tcpdump should use to see that the
HW is going to checksum the packet, and therefore it should elide
trying to verify the checksums.

It's not a kernel issue.
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