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| author | David Ahern <dsa@cumulusnetworks.com> | 2017-03-31 16:14:00 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-04-02 05:21:44 +0200 |
| commit | 77ef013aadadd248843ad90022f36ba177b24e7f (patch) | |
| tree | 944da02d049a953f9ca22660300af25b8493dcfe /net/mpls/af_mpls.c | |
| parent | net: mpls: rt_nhn_alive and nh_flags should be accessed using READ_ONCE (diff) | |
| download | linux-77ef013aadadd248843ad90022f36ba177b24e7f.tar.xz linux-77ef013aadadd248843ad90022f36ba177b24e7f.zip | |
net: mpls: Convert number of nexthops to u8
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>
Diffstat (limited to 'net/mpls/af_mpls.c')
| -rw-r--r-- | net/mpls/af_mpls.c | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c index 6bdd2f95b576..665dec84f001 100644 --- a/net/mpls/af_mpls.c +++ b/net/mpls/af_mpls.c @@ -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, - u8 cfg_via_alen, u8 *max_via_alen) +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) |