linux-kernel - Re: [PATCH 1/1 2.6.28] cxgb3 - remove duplicate tests in lro

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Message-ID: <48CC1607.9060901@garzik.org>
Date:	Sat, 13 Sep 2008 15:35:35 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Divy Le Ray <divy@...lsio.com>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	swise@...ngridcomputing.com
Subject: Re: [PATCH 1/1 2.6.28] cxgb3 - remove duplicate tests in lro

Divy Le Ray wrote:
> From: Divy Le Ray <divy@...lsio.com>
> 
> The generic lro code checks TCP flags/options.
> Remove duplicate tests done in the driver.
> 
> Signed-off-by: Divy Le Ray <divy@...lsio.com>
> ---
> 
>  drivers/net/cxgb3/sge.c |   35 -----------------------------------
>  1 files changed, 0 insertions(+), 35 deletions(-)
> 
> diff --git a/drivers/net/cxgb3/sge.c b/drivers/net/cxgb3/sge.c
> index 1b0861d..f78a42c 100644
> --- a/drivers/net/cxgb3/sge.c
> +++ b/drivers/net/cxgb3/sge.c
> @@ -1937,38 +1937,6 @@ static inline int lro_frame_ok(const struct cpl_rx_pkt *p)
>  		eh->h_proto == htons(ETH_P_IP) && ih->ihl == (sizeof(*ih) >> 2);
>  }
>  
> -#define TCP_FLAG_MASK (TCP_FLAG_CWR | TCP_FLAG_ECE | TCP_FLAG_URG |\
> -                       TCP_FLAG_ACK | TCP_FLAG_PSH | TCP_FLAG_RST |\
> -		                       TCP_FLAG_SYN | TCP_FLAG_FIN)
> -#define TSTAMP_WORD ((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |\
> -                     (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP)
> -
> -/**
> - *	lro_segment_ok - check if a TCP segment is eligible for LRO
> - *	@tcph: the TCP header of the packet
> - *
> - *	Returns true if a TCP packet is eligible for LRO.  This requires that
> - *	the packet have only the ACK flag set and no TCP options besides
> - *	time stamps.
> - */
> -static inline int lro_segment_ok(const struct tcphdr *tcph)
> -{
> -	int optlen;
> -
> -	if (unlikely((tcp_flag_word(tcph) & TCP_FLAG_MASK) != TCP_FLAG_ACK))
> -		return 0;
> -
> -	optlen = (tcph->doff << 2) - sizeof(*tcph);
> -	if (optlen) {
> -		const u32 *opt = (const u32 *)(tcph + 1);
> -
> -		if (optlen != TCPOLEN_TSTAMP_ALIGNED ||
> -		    *opt != htonl(TSTAMP_WORD) || !opt[2])
> -			return 0;
> -	}
> -	return 1;
> -}
> -
>  static int t3_get_lro_header(void **eh,  void **iph, void **tcph,
>  			     u64 *hdr_flags, void *priv)

applied


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