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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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26
net/mpls/af_mpls.c
View File

@ -197,10 +197,10 @@ static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb)
static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt,
struct sk_buff *skb)
{
unsigned int alive;
u32 hash = 0;
int nh_index = 0;
int n = 0;
u8 alive;
/* No need to look further into packet if there's only
* one path
@ -466,7 +466,7 @@ struct mpls_route_config {
int rc_mp_len;
};
static struct mpls_route *mpls_rt_alloc(int num_nh, u8 max_alen)
static struct mpls_route *mpls_rt_alloc(u8 num_nh, u8 max_alen)
{
u8 max_alen_aligned = ALIGN(max_alen, VIA_ALEN_ALIGN);
struct mpls_route *rt;
@ -744,11 +744,11 @@ errout:
return err;
}
static int mpls_count_nexthops(struct rtnexthop *rtnh, int len,
static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len,
u8 cfg_via_alen, u8 *max_via_alen)
{
int nhs = 0;
int remaining = len;
u8 nhs = 0;
if (!rtnh) {
*max_via_alen = cfg_via_alen;
@ -773,7 +773,13 @@ static int mpls_count_nexthops(struct rtnexthop *rtnh, int len,
via_alen);
}
/* number of nexthops is tracked by a u8.
* Check for overflow.
*/
if (nhs == 255)
return 0;
nhs++;
rtnh = rtnh_next(rtnh, &remaining);
}
@ -787,8 +793,8 @@ static int mpls_nh_build_multi(struct mpls_route_config *cfg,
struct rtnexthop *rtnh = cfg->rc_mp;
struct nlattr *nla_via, *nla_newdst;
int remaining = cfg->rc_mp_len;
int nhs = 0;
int err = 0;
u8 nhs = 0;
change_nexthops(rt) {
int attrlen;
@ -842,7 +848,7 @@ static int mpls_route_add(struct mpls_route_config *cfg)
int err = -EINVAL;
u8 max_via_alen;
unsigned index;
int nhs;
u8 nhs;
index = cfg->rc_label;
@ -1310,7 +1316,7 @@ static void mpls_ifdown(struct net_device *dev, int event)
{
struct mpls_route __rcu **platform_label;
struct net *net = dev_net(dev);
unsigned int alive, deleted;
u8 alive, deleted;
unsigned index;
platform_label = rtnl_dereference(net->mpls.platform_label);
@ -1362,7 +1368,7 @@ static void mpls_ifup(struct net_device *dev, unsigned int flags)
struct mpls_route __rcu **platform_label;
struct net *net = dev_net(dev);
unsigned index;
int alive;
u8 alive;
platform_label = rtnl_dereference(net->mpls.platform_label);
for (index = 0; index < net->mpls.platform_labels; index++) {
@ -1786,8 +1792,8 @@ static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event,
} else {
struct rtnexthop *rtnh;
struct nlattr *mp;
int dead = 0;
int linkdown = 0;
u8 linkdown = 0;
u8 dead = 0;
mp = nla_nest_start(skb, RTA_MULTIPATH);
if (!mp)

5
net/mpls/internal.h
View File

@ -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];
};