netdev - RE: [EXT] Re: [PATCH net-next] net: mvpp2: Add parsing support for different IPv4 IHL values

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Date:   Tue, 13 Apr 2021 09:55:54 +0000
From:   Stefan Chulski <stefanc@...vell.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Nadav Haklai <nadavh@...vell.com>,
        Yan Markman <ymarkman@...vell.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "mw@...ihalf.com" <mw@...ihalf.com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "atenart@...nel.org" <atenart@...nel.org>,
        Liron Himi <lironh@...vell.com>, Dana Vardi <danat@...vell.com>
Subject: RE: [EXT] Re: [PATCH net-next] net: mvpp2: Add parsing support for
 different IPv4 IHL values

> > -----Original Message-----
> > From: Russell King - ARM Linux admin <linux@...linux.org.uk>
> > Sent: Tuesday, April 13, 2021 12:18 PM
> > To: Stefan Chulski <stefanc@...vell.com>
> > Cc: netdev@...r.kernel.org; thomas.petazzoni@...tlin.com;
> > davem@...emloft.net; Nadav Haklai <nadavh@...vell.com>; Yan
> Markman
> > <ymarkman@...vell.com>; linux-kernel@...r.kernel.org;
> kuba@...nel.org;
> > mw@...ihalf.com; andrew@...n.ch; atenart@...nel.org; Liron Himi
> > <lironh@...vell.com>; Dana Vardi <danat@...vell.com>
> > Subject: [EXT] Re: [PATCH net-next] net: mvpp2: Add parsing support
> > for different IPv4 IHL values
> >
> > External Email
> >
> > ----------------------------------------------------------------------
> > On Tue, Apr 13, 2021 at 11:45:31AM +0300, stefanc@...vell.com wrote:
> > > From: Stefan Chulski <stefanc@...vell.com>
> > >
> > > Add parser entries for different IPv4 IHL values.
> > > Each entry will set the L4 header offset according to the IPv4 IHL field.
> > > L3 header offset will set during the parsing of the IPv4 protocol.
> >
> > What is the impact of this commit? Is something broken at the moment,
> > if so what? Does this need to be backported to stable kernels?
> >
> > These are key questions, of which the former two should be covered in
> > every commit message so that the reason for the change can be known.
> > It's no good just describing what is being changed in the commit
> > without also describing why the change is being made.
> >
> > Thanks.
> 
> Due to missed parser support for IP header length > 20, RX IPv4 checksum
> offload fail.
> 
> Regards.

Currently driver set skb->ip_summed = CHECKSUM_NONE and checksum done by software.
So this just improve performance for packets with IP header length > 20. 
IMO we can keep it in net-next.

Stefan.