netdev - RE: [PATCH 1/1] tcp: Replace constants with #define macros

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Date:	Tue, 20 Dec 2011 10:27:21 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Vijay Subramanian" <subramanian.vijay@...il.com>,
	<netdev@...r.kernel.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	"Eric Dumazet" <eric.dumazet@...il.com>,
	<ilpo.jarvinen@...sinki.fi>, "H.K. Jerry Chu" <hkchu@...gle.com>
Subject: RE: [PATCH 1/1] tcp: Replace constants with #define macros

 
> diff --git a/include/linux/tcp.h b/include/linux/tcp.h
> index 7f59ee9..874b043 100644
> --- a/include/linux/tcp.h
> +++ b/include/linux/tcp.h
> @@ -238,6 +238,11 @@ struct tcp_sack_block {
>  	u32	end_seq;
>  };
>  
> +/*These are used to set the sack_ok field in struct 
> tcp_options_received */
> +#define SACK_SEEN     (1 << 0)   /*1 = peer is SACK capable, */
> +#define FACK_ENABLED  (1 << 1)   /*1 = FACK is enabled locally*/
> +#define DSACK_SEEN    (1 << 2)   /*1 = DSACK was received from peer*/
> +

Since that is a fairly public header, some namespace protection
might be sensible.

> -	tcp_opt->sack_ok = (options >> 4) & 0x1;
> +	tcp_opt->sack_ok = (options >> 4) & SACK_SEEN;

Looks to me like that 0x1 isn't SAC_SEEK! So this is now misleading.

	David


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