netdev - RE: [PATCH net-next-2.6 2/7] be2net: Checksum field valid only for TCP/UDP

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Date:	Fri, 11 Mar 2011 02:04:41 -0800
From:	<Padmanabh.Ratnakar@...lex.Com>
To:	<linuxram@...ibm.com>
CC:	<netdev@...r.kernel.org>, <davem@...emloft.net>,
	<Sathya.Perla@...lex.Com>, <subbu.seetharaman@...lex.com>
Subject: RE: [PATCH net-next-2.6 2/7] be2net: Checksum field valid only for
 TCP/UDP

On Mon, Mar 07, 2011 at 06:38:16PM +0530, Padmanabh Ratnakar wrote:
> L4 checksum field is valid only for TCP/UDP packets in Lancer
> 
> Signed-off-by: Padmanabh Ratnakar <padmanabh.ratnakar@...lex.com>
> Signed-off-by: Sathya Perla <sathya.perla@...lex.com>
> Signed-off-by: Subramanian Seetharaman <subbu.seetharaman@...lex.com>
> ---
>  drivers/net/benet/be_main.c |    9 ++++++---
>  1 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/benet/be_main.c b/drivers/net/benet/be_main.c
> index bf34434..ac7ae21 100644
> --- a/drivers/net/benet/be_main.c
> +++ b/drivers/net/benet/be_main.c
> @@ -865,14 +865,17 @@ static void be_rx_stats_update(struct be_rx_obj *rxo,
> 
>  static inline bool csum_passed(struct be_eth_rx_compl *rxcp)
>  {
> -	u8 l4_cksm, ipv6, ipcksm;
> +	u8 l4_cksm, ipv6, ipcksm, tcpf, udpf;
> 
>  	l4_cksm = AMAP_GET_BITS(struct amap_eth_rx_compl, l4_cksm, rxcp);
>  	ipcksm = AMAP_GET_BITS(struct amap_eth_rx_compl, ipcksm, rxcp);
>  	ipv6 = AMAP_GET_BITS(struct amap_eth_rx_compl, ip_version, rxcp);
> +	tcpf = AMAP_GET_BITS(struct amap_eth_rx_compl, tcpf, rxcp);
> +	udpf = AMAP_GET_BITS(struct amap_eth_rx_compl, udpf, rxcp);
> 
> -	/* Ignore ipcksm for ipv6 pkts */
> -	return l4_cksm && (ipcksm || ipv6);
> +	/* L4 checksum is not reliable for non TCP/UDP packets.
> +	 * Also ignore ipcksm for ipv6 pkts */
> +	return (tcpf || udpf) && l4_cksm && (ipcksm || ipv6);

> Is it invalid for non-Lancer too ?  if not, then should'nt the
> above condition be applied only for lancer?

> RP

There is no need to apply this condition only for Lancer. This check works for BE too.
In BE, for non-tcp/udp packets l4_csum is always 0.

Thanks,
Padmanabh
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