From: Jiri Pirko <j...@mellanox.com>
Ido says:
When the kernel forwards IPv4 packets via multipath routes it doesn't
consider nexthops that are dead or linkdown. For example, if the nexthop
netdev is administratively down or doesn't have a carrier.
Devices capable of offloading such multipath routes need to be made
aware of changes in the reflected nexthops' status. Otherwise, the
device might forward packets via non-functional nexthops, resulting in
packet loss. This patchset aims to fix that.
The first 11 patches deal with the necessary restructuring in the
mlxsw driver, so that it's able to correctly add and remove nexthops
from the device's adjacency table.
The 12th patch adds the NH_{ADD,DEL} events to the FIB notification
chain. These notifications are sent whenever the kernel decides to add
or remove a nexthop from the forwarding plane.
Finally, the last three patches add support for these events in the
mlxsw driver, which is currently the only driver capable of offloading
multipath routes.
Ido Schimmel (15):
mlxsw: spectrum_router: Nullify nexthop's neigh pointer
mlxsw: spectrum_router: Store nexthop groups in a hash table
mlxsw: spectrum_router: Store nexthops in a hash table
mlxsw: spectrum_router: Use nexthop's scope to set action type
mlxsw: spectrum_router: Add gateway indication to nexthop group
mlxsw: spectrum_router: Store routes in a more generic way
mlxsw: spectrum_router: Remove FIB info from FIB entry struct
mlxsw: spectrum_router: Refactor nexthop init routine
mlxsw: spectrum_router: More accurately set offload flag
mlxsw: spectrum_router: Determine offload status using generic
function
mlxsw: spectrum_router: Use trap action only for some route types
ipv4: fib: Notify about nexthop status changes
mlxsw: spectrum_router: Reflect nexthop status changes
mlxsw: spectrum_router: Don't reflect LINKDOWN nexthops
mlxsw: spectrum_router: Flush resources when RIF is deleted
drivers/net/ethernet/mellanox/mlxsw/spectrum.c | 6 +
drivers/net/ethernet/mellanox/mlxsw/spectrum.h | 7 +-
.../net/ethernet/mellanox/mlxsw/spectrum_router.c | 534 ++++++++++++++++-----
include/net/ip_fib.h | 7 +
net/ipv4/fib_semantics.c | 33 ++
5 files changed, 457 insertions(+), 130 deletions(-)
--
2.7.4
