[openfabrics-ewg] [PATCH] enable RDMA CM multicast support on RH4 U4

[Or Gerlitz]

Or Gerlitz wrote:
> Similarily to the network stack, the RDMA CM uses ip_ib_mc_map to map IPv4
> IP addresses to IB MGIDs. This function was removed from RHAS4U4 by mistake
> however, the RDMA CM multicast code can work well on this system.
> 
> Signed-off-by: Or Gerlitz <ogerlitz at voltaire.com>

Michael, Vlad,

I haven't seen any response on this, do you have any problem merging 
this patch?

Or.

> 
> Index: ofed_1_2/kernel_addons/backport/2.6.9_U4/include/net/ip.h
> ===================================================================
> --- ofed_1_2.orig/kernel_addons/backport/2.6.9_U4/include/net/ip.h	2007-02-11 16:28:55.000000000 +0200
> +++ ofed_1_2/kernel_addons/backport/2.6.9_U4/include/net/ip.h	2007-02-11 16:31:54.000000000 +0200
> @@ -3,7 +3,42 @@
> 
>  #include_next <net/ip.h>
> 
> -/* ip_ib_mc_map was removed from RHAS4U4 by mistake */
> -#define ip_ib_mc_map ip_tr_mc_map
> +/* ip_ib_mc_map was removed from RHAS4U4 by mistake - put here a copy of it
> +   to be used by the rdma cm multicast code
> + */
> +
> +/*
> + *	Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
> + *	Leave P_Key as 0 to be filled in by driver.
> + */
> +
> +static inline void ip_ib_mc_map(__be32 naddr, char *buf)
> +{
> +	__u32 addr;
> +	buf[0]  = 0;		/* Reserved */
> +	buf[1]  = 0xff;		/* Multicast QPN */
> +	buf[2]  = 0xff;
> +	buf[3]  = 0xff;
> +	addr    = ntohl(naddr);
> +	buf[4]  = 0xff;
> +	buf[5]  = 0x12;		/* link local scope */
> +	buf[6]  = 0x40;		/* IPv4 signature */
> +	buf[7]  = 0x1b;
> +	buf[8]  = 0;		/* P_Key */
> +	buf[9]  = 0;
> +	buf[10] = 0;
> +	buf[11] = 0;
> +	buf[12] = 0;
> +	buf[13] = 0;
> +	buf[14] = 0;
> +	buf[15] = 0;
> +	buf[19] = addr & 0xff;
> +	addr  >>= 8;
> +	buf[18] = addr & 0xff;
> +	addr  >>= 8;
> +	buf[17] = addr & 0xff;
> +	addr  >>= 8;
> +	buf[16] = addr & 0x0f;
> +}
> 
>  #endif
> 
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