From: "Michał Mirosław" <mirqus@gmail.com>
To: David Ward <david.ward@ll.mit.edu>
Cc: netdev@vger.kernel.org, Julian Anastasov <ja@ssi.bg>
Subject: Re: [PATCH 2/2] net: Handle different key sizes between address families in flow cache
Date: Sun, 4 Sep 2011 17:34:19 +0200 [thread overview]
Message-ID: <CAHXqBF+eF_zYAFPZv0hWUvDHv5YMHuFAR3-iB8MEZz2G7vCUyA@mail.gmail.com> (raw)
In-Reply-To: <1315141641-3120-3-git-send-email-david.ward@ll.mit.edu>
2011/9/4 David Ward <david.ward@ll.mit.edu>:
> With the conversion of struct flowi to a union of AF-specific structs, some
> operations on the flow cache need to account for the exact size of the key.
[...]
> --- a/include/net/flow.h
> +++ b/include/net/flow.h
[...]
> +typedef unsigned long flow_compare_t;
> +
> +static inline size_t flowi_size(u16 family)
> +{
> + switch (family) {
> + case AF_INET:
> + BUILD_BUG_ON(sizeof(struct flowi4) % sizeof(flow_compare_t));
> + return sizeof(struct flowi4);
> + case AF_INET6:
> + BUILD_BUG_ON(sizeof(struct flowi6) % sizeof(flow_compare_t));
> + return sizeof(struct flowi6);
> + case AF_DECnet:
> + BUILD_BUG_ON(sizeof(struct flowidn) % sizeof(flow_compare_t));
> + return sizeof(struct flowidn);
> + }
> + return 0;
> +}
Since most called user (flow_key_compare) uses returned value didided
by sizeof(flow_compare_t), you could just return divided value here
and save some shift operations by it.
Best Regards,
Michał Mirosław
next prev parent reply other threads:[~2011-09-04 15:34 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-31 16:05 [PATCH] net: Initialize entire flowi struct David Ward
2011-08-31 20:51 ` Julian Anastasov
2011-08-31 20:47 ` David Miller
2011-09-01 13:34 ` Ward, David - 0663 - MITLL
2011-09-03 7:27 ` Julian Anastasov
2011-09-04 13:07 ` [PATCH 0/2] Fixes to flow cache for AF-specifc flowi structs David Ward
2011-09-04 13:07 ` [PATCH 1/2] net: Align AF-specific flowi structs to long David Ward
2011-09-16 22:57 ` David Miller
2011-09-04 13:07 ` [PATCH 2/2] net: Handle different key sizes between address families in flow cache David Ward
2011-09-04 15:34 ` Michał Mirosław [this message]
2011-09-06 2:47 ` [PATCH 0/2] Fixes to flow cache for AF-specifc flowi structs David Ward
2011-09-06 2:47 ` [PATCH 1/2] net: Align AF-specific flowi structs to long David Ward
2011-09-06 2:47 ` [PATCH 2/2] net: Handle different key sizes between address families in flow cache David Ward
2011-09-16 22:57 ` David Miller
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