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net: mpls: Convert number of nexthops to u8

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Number of nexthops and number of alive nexthops are tracked using an
unsigned int. A route should never have more than 255 nexthops so
convert both to u8. Update all references and intermediate variables
to consistently use u8 as well.

Shrinks the size of mpls_route from 32 bytes to 24 bytes with a 2-byte
hole before the nexthops.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern
2017-03-31 07:14:00 -07:00
committed by David S. Miller
parent 39eb8cd175
commit 77ef013aad
2 changed files with 20 additions and 13 deletions
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5
net/mpls/internal.h
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@@ -127,12 +127,13 @@ struct mpls_route { /* next hop label forwarding entry */
u8 rt_payload_type;
u8 rt_max_alen;
u8 rt_ttl_propagate;
unsigned int rt_nhn;
u8 rt_nhn;
/* rt_nhn_alive is accessed under RCU in the packet path; it
* is modified handling netdev events with rtnl lock held
*/
unsigned int rt_nhn_alive;
u8 rt_nhn_alive;
u16 rt_reserved1;
struct mpls_nh rt_nh[0];
};