linux-kernel - Re: [PATCH V2 net-next] net: hns: Fix to conditionally convey RX checksum flag to stack

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Message-Id: <20161203.150905.739546865468666597.davem@davemloft.net>
Date:   Sat, 03 Dec 2016 15:09:05 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     salil.mehta@...wei.com
Cc:     yisen.zhuang@...wei.com, mehta.salil.lnk@...il.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxarm@...wei.com
Subject: Re: [PATCH V2 net-next] net: hns: Fix to conditionally convey RX
 checksum flag to stack

From: Salil Mehta <salil.mehta@...wei.com>
Date: Thu, 1 Dec 2016 12:09:22 +0000

> But maybe now since we don't have any method to de-multiplex the kind of
> checksum error (cannot depend upon register) we can have below code
> re-arrangement:
> 
> hns_nic_rx_checksum() {
>       /* check supported L3 protocol */
> 	if (l3 != IPV4 && l3 != IPV6)
> 		return;
>       /* check if L3 protocols error */
>       if (l3e)
> 	 	return;
> 
>       /* check if the packets are fragmented */
> 	If (l3frags)
> 		Return;
> 
>       /* check supported L4 protocol */
>  	if (l4 != UDP && l4 != TCP && l4 != SCTP)
>  		return;
>       /* check if any L4 protocol error */
>       if (l3e)
> 	 	return;
> 
>       /* packet with valid checksum - covey to stack */
>       skb->ip_summed = CHECKSUM_UNNECESSARY
> }

This looks a lot cleaner and easier to understand.