net: ipmr: Add MFC offload indication

Allow drivers, registered to the fib notification chain indicate whether a
multicast MFC route is offloaded or not, similarly to unicast routes. The
indication of whether a route is offloaded is done using the mfc_flags
field on an mfc_cache struct, and the information is sent to the userspace
via the RTNetlink interface only.

Currently, MFC routes are either offloaded or not, thus there is no need to
add per-VIF offload indication.

Signed-off-by: Yotam Gigi <yotamg@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/mroute.h b/include/linux/mroute.h
index 54c5cb82ddcb133e8fc8a7d77cfd89581239701f..5566580811ce6f858a272ced6ab0b82510aec105 100644 (file)
--- a/include/linux/mroute.h
+++ b/include/linux/mroute.h
@@ -90,9 +90,11 @@ struct mr_table {
 
 /* mfc_flags:
  * MFC_STATIC - the entry was added statically (not by a routing daemon)
+ * MFC_OFFLOAD - the entry was offloaded to the hardware
  */
 enum {
        MFC_STATIC = BIT(0),
+       MFC_OFFLOAD = BIT(1),
 };
 
 struct mfc_cache_cmp_arg {

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index ba71bc402336928234598489f57b4f606bf9ca4d..2a795d2c050294eba6fcbb09b0e864f3560fa3a1 100644 (file)
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -2268,6 +2268,9 @@ static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
            nla_put_u32(skb, RTA_IIF, mrt->vif_table[c->mfc_parent].dev->ifindex) < 0)
                return -EMSGSIZE;
 
+       if (c->mfc_flags & MFC_OFFLOAD)
+               rtm->rtm_flags |= RTNH_F_OFFLOAD;
+
        if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH)))
                return -EMSGSIZE;