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net: Abstract default ADVMSS behind an accessor.

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Make all RTAX_ADVMSS metric accesses go through a new helper function,
dst_metric_advmss().

Leave the actual default metric as "zero" in the real metric slot,
and compute the actual default value dynamically via a new dst_ops
AF specific callback.

For stacked IPSEC routes, we use the advmss of the path which
preserves existing behavior.

Unlike ipv4/ipv6, DecNET ties the advmss to the mtu and thus updates
advmss on pmtu updates.  This inconsistency in advmss handling
results in more raw metric accesses than I wish we ended up with.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2010-12-13 12:52:14 -08:00
parent cc6f02dd49
commit 0dbaee3b37
11 changed files with 75 additions and 33 deletions
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2
drivers/scsi/cxgbi/libcxgbi.c
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@@ -825,7 +825,7 @@ unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
unsigned int idx;
struct dst_entry *dst = csk->dst;
csk->advmss = dst_metric(dst, RTAX_ADVMSS);
csk->advmss = dst_metric_advmss(dst);
if (csk->advmss > pmtu - 40)
csk->advmss = pmtu - 40;