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ila: cleanup checksum diff 

Consolidate computing checksum diff into one function.

Add get_csum_diff_iaddr that computes the checksum diff between
an address argument and locator being written. get_csum_diff
calls this using the destination address in the IP header as
the argument.

Also moved ila_init_saved_csum to be close to the checksum

diff functions.

Signed-off-by: Tom Herbert <tom@quantonium.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2017-11-05 15:58:22 -08:00 committed by David S. Miller
parent 3e29cd0e65
commit 80661e7687
1 changed files with 18 additions and 21 deletions
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39
net/ipv6/ila/ila_common.c
View File

@ -13,15 +13,28 @@
#include <uapi/linux/ila.h>
#include "ila.h"
static __wsum get_csum_diff(struct ipv6hdr *ip6h, struct ila_params *p)
void ila_init_saved_csum(struct ila_params *p)
{
struct ila_addr *iaddr = ila_a2i(&ip6h->daddr);
if (!p->locator_match.v64)
return;
p->csum_diff = compute_csum_diff8(
(__be32 *)&p->locator,
(__be32 *)&p->locator_match);
}
static __wsum get_csum_diff_iaddr(struct ila_addr *iaddr, struct ila_params *p)
{
if (p->locator_match.v64)
return p->csum_diff;
else
return compute_csum_diff8((__be32 *)&iaddr->loc,
(__be32 *)&p->locator);
return compute_csum_diff8((__be32 *)&p->locator,
(__be32 *)&iaddr->loc);
}
static __wsum get_csum_diff(struct ipv6hdr *ip6h, struct ila_params *p)
{
return get_csum_diff_iaddr(ila_a2i(&ip6h->daddr), p);
}
static void ila_csum_do_neutral(struct ila_addr *iaddr,
@ -30,13 +43,7 @@ static void ila_csum_do_neutral(struct ila_addr *iaddr,
__sum16 *adjust = (__force __sum16 *)&iaddr->ident.v16[3];
__wsum diff, fval;
/* Check if checksum adjust value has been cached */
if (p->locator_match.v64) {
diff = p->csum_diff;
} else {
diff = compute_csum_diff8((__be32 *)&p->locator,
(__be32 *)iaddr);
}
diff = get_csum_diff_iaddr(iaddr, p);
fval = (__force __wsum)(ila_csum_neutral_set(iaddr->ident) ?
CSUM_NEUTRAL_FLAG : ~CSUM_NEUTRAL_FLAG);
@ -134,16 +141,6 @@ void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p,
iaddr->loc = p->locator;
}
void ila_init_saved_csum(struct ila_params *p)
{
if (!p->locator_match.v64)
return;
p->csum_diff = compute_csum_diff8(
(__be32 *)&p->locator,
(__be32 *)&p->locator_match);
}
static int __init ila_init(void)
{
int ret;