netdev - Re: [PATCH net-next v2] ipvs: fix multiplicative hashing in sh/dh/lblc/lblcr algorithms

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Date:   Sun, 1 Apr 2018 14:11:51 +0300 (EEST)
From:   Julian Anastasov <ja@....bg>
To:     Vincent Bernat <vincent@...nat.im>
cc:     Wensong Zhang <wensong@...ux-vs.org>,
        Simon Horman <horms@...ge.net.au>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        lvs-devel@...r.kernel.org
Subject: Re: [PATCH net-next v2] ipvs: fix multiplicative hashing in
 sh/dh/lblc/lblcr algorithms


	Hello,

On Sun, 1 Apr 2018, Vincent Bernat wrote:

> The sh/dh/lblc/lblcr algorithms are using Knuth's multiplicative
> hashing incorrectly. Replace its use by the hash_32() macro, which
> correctly implements this algorithm. It doesn't use the same constant,
> but it shouldn't matter.
> 
> Signed-off-by: Vincent Bernat <vincent@...nat.im>

	Looks good to me, thanks! Simon, please apply, if possible
with the extra space removed, see below...

Acked-by: Julian Anastasov <ja@....bg>

> ---
>  net/netfilter/ipvs/ip_vs_dh.c    | 3 ++-
>  net/netfilter/ipvs/ip_vs_lblc.c  | 3 ++-
>  net/netfilter/ipvs/ip_vs_lblcr.c | 3 ++-
>  net/netfilter/ipvs/ip_vs_sh.c    | 3 ++-
>  4 files changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/net/netfilter/ipvs/ip_vs_dh.c b/net/netfilter/ipvs/ip_vs_dh.c
> index 75f798f8e83b..dfea31fb10c5 100644
> --- a/net/netfilter/ipvs/ip_vs_dh.c
> +++ b/net/netfilter/ipvs/ip_vs_dh.c
> @@ -43,6 +43,7 @@
>  #include <linux/module.h>
>  #include <linux/kernel.h>
>  #include <linux/skbuff.h>
> +#include <linux/hash.h>
>  
>  #include <net/ip_vs.h>
>  
> @@ -81,7 +82,7 @@ static inline unsigned int ip_vs_dh_hashkey(int af, const union nf_inet_addr *ad
>  		addr_fold = addr->ip6[0]^addr->ip6[1]^
>  			    addr->ip6[2]^addr->ip6[3];
>  #endif
> -	return (ntohl(addr_fold)*2654435761UL) & IP_VS_DH_TAB_MASK;
> +	return hash_32(ntohl(addr_fold),  IP_VS_DH_TAB_BITS);

	Extra space above

>  }
>  
>  
> diff --git a/net/netfilter/ipvs/ip_vs_lblc.c b/net/netfilter/ipvs/ip_vs_lblc.c
> index 3057e453bf31..08147fc6400c 100644
> --- a/net/netfilter/ipvs/ip_vs_lblc.c
> +++ b/net/netfilter/ipvs/ip_vs_lblc.c
> @@ -48,6 +48,7 @@
>  #include <linux/kernel.h>
>  #include <linux/skbuff.h>
>  #include <linux/jiffies.h>
> +#include <linux/hash.h>
>  
>  /* for sysctl */
>  #include <linux/fs.h>
> @@ -160,7 +161,7 @@ ip_vs_lblc_hashkey(int af, const union nf_inet_addr *addr)
>  		addr_fold = addr->ip6[0]^addr->ip6[1]^
>  			    addr->ip6[2]^addr->ip6[3];
>  #endif
> -	return (ntohl(addr_fold)*2654435761UL) & IP_VS_LBLC_TAB_MASK;
> +	return hash_32(ntohl(addr_fold), IP_VS_LBLC_TAB_BITS);
>  }
>  
>  
> diff --git a/net/netfilter/ipvs/ip_vs_lblcr.c b/net/netfilter/ipvs/ip_vs_lblcr.c
> index 92adc04557ed..9b6a6c9e9cfa 100644
> --- a/net/netfilter/ipvs/ip_vs_lblcr.c
> +++ b/net/netfilter/ipvs/ip_vs_lblcr.c
> @@ -47,6 +47,7 @@
>  #include <linux/jiffies.h>
>  #include <linux/list.h>
>  #include <linux/slab.h>
> +#include <linux/hash.h>
>  
>  /* for sysctl */
>  #include <linux/fs.h>
> @@ -323,7 +324,7 @@ ip_vs_lblcr_hashkey(int af, const union nf_inet_addr *addr)
>  		addr_fold = addr->ip6[0]^addr->ip6[1]^
>  			    addr->ip6[2]^addr->ip6[3];
>  #endif
> -	return (ntohl(addr_fold)*2654435761UL) & IP_VS_LBLCR_TAB_MASK;
> +	return hash_32(ntohl(addr_fold), IP_VS_LBLCR_TAB_BITS);
>  }
>  
>  
> diff --git a/net/netfilter/ipvs/ip_vs_sh.c b/net/netfilter/ipvs/ip_vs_sh.c
> index 16aaac6eedc9..1e01c782583a 100644
> --- a/net/netfilter/ipvs/ip_vs_sh.c
> +++ b/net/netfilter/ipvs/ip_vs_sh.c
> @@ -96,7 +96,8 @@ ip_vs_sh_hashkey(int af, const union nf_inet_addr *addr,
>  		addr_fold = addr->ip6[0]^addr->ip6[1]^
>  			    addr->ip6[2]^addr->ip6[3];
>  #endif
> -	return (offset + (ntohs(port) + ntohl(addr_fold))*2654435761UL) &
> +	return (offset + hash_32(ntohs(port) + ntohl(addr_fold),
> +				 IP_VS_SH_TAB_BITS)) &
>  		IP_VS_SH_TAB_MASK;
>  }
>  
> -- 
> 2.16.3

Regards

--
Julian Anastasov <ja@....bg>