netdev - Re: [PATCH v2 net] smsc95xx: Support only IPv4 TCP/UDP csum offload

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Date:   Sun, 21 May 2017 13:32:19 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     Nisar.Sayed@...rochip.com
Cc:     netdev@...r.kernel.org, UNGLinuxDriver@...rochip.com,
        steve.glendinning@...well.net, popcornmix@...il.com
Subject: Re: [PATCH v2 net] smsc95xx: Support only IPv4 TCP/UDP csum offload

From: <Nisar.Sayed@...rochip.com>
Date: Fri, 19 May 2017 14:00:25 +0000

> From: Nisar Sayed <Nisar.Sayed@...rochip.com>
> 
> When TX checksum offload is used, if the computed checksum is 0 the
> LAN95xx device do not alter the checksum to 0xffff.  In the case of ipv4
> UDP checksum, it indicates to receiver that no checksum is calculated.
> Under ipv6, UDP checksum yields a result of zero must be changed to
> 0xffff. Hence disabling checksum offload for ipv6 packets.
> 
> Signed-off-by: Nisar Sayed <Nisar.Sayed@...rochip.com>
> 
> Reported-by: popcorn mix <popcornmix@...il.com>

Appied, thanks.