net: ipmr/ip6mr: add support for keeping an entry age

In preparation for hardware offloading of ipmr/ip6mr we need an
interface that allows to check (and later update) the age of entries.
Relying on stats alone can show activity but not actual age of the entry,
furthermore when there're tens of thousands of entries a lot of the
hardware implementations only support "hit" bits which are cleared on
read to denote that the entry was active and shouldn't be aged out,
these can then be naturally translated into age timestamp and will be
compatible with the software forwarding age. Using a lastuse entry doesn't
affect performance because the members in that cache line are written to
along with the age.
Since all new users are encouraged to use ipmr via netlink, this is
exported via the RTA_EXPIRES attribute.
Also do a minor local variable declaration style adjustment - arrange them
longest to shortest.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
CC: Roopa Prabhu <roopa@cumulusnetworks.com>
CC: Shrijeet Mukherjee <shm@cumulusnetworks.com>
CC: Satish Ashok <sashok@cumulusnetworks.com>
CC: Donald Sharp <sharpd@cumulusnetworks.com>
CC: David S. Miller <davem@davemloft.net>
CC: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
CC: James Morris <jmorris@namei.org>
CC: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
CC: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 4 deletions

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 5ad48ec77710..e0d76f5f0113 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1150,6 +1150,7 @@ static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
         c->mfc_origin = mfc->mfcc_origin.s_addr;
         c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr;
         c->mfc_parent = mfc->mfcc_parent;
+        c->mfc_un.res.lastuse = jiffies;
         ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls);
         if (!mrtsock)
                 c->mfc_flags |= MFC_STATIC;
@@ -1792,6 +1793,7 @@ static void ip_mr_forward(struct net *net, struct mr_table *mrt,
         vif = cache->mfc_parent;
         cache->mfc_un.res.pkt++;
         cache->mfc_un.res.bytes += skb->len;
+        cache->mfc_un.res.lastuse = jiffies;
 
         if (cache->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) {
                 struct mfc_cache *cache_proxy;
@@ -2071,10 +2073,10 @@ drop:
 static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
                               struct mfc_cache *c, struct rtmsg *rtm)
 {
-        int ct;
-        struct rtnexthop *nhp;
-        struct nlattr *mp_attr;
         struct rta_mfc_stats mfcs;
+        struct nlattr *mp_attr;
+        struct rtnexthop *nhp;
+        int ct;
 
         /* If cache is unresolved, don't try to parse IIF and OIF */
         if (c->mfc_parent >= MAXVIFS)
@@ -2106,7 +2108,10 @@ static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
         mfcs.mfcs_packets = c->mfc_un.res.pkt;
         mfcs.mfcs_bytes = c->mfc_un.res.bytes;
         mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
-        if (nla_put_64bit(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs, RTA_PAD) < 0)
+        if (nla_put_64bit(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs, RTA_PAD) ||
+            nla_put_u64_64bit(skb, RTA_EXPIRES,
+                              jiffies_to_clock_t(c->mfc_un.res.lastuse),
+                              RTA_PAD))
                 return -EMSGSIZE;
 
         rtm->rtm_type = RTN_MULTICAST;