net/mlx5e: Update neighbour 'used' state using HW flow rules counters
authorHadar Hen Zion <hadarh@mellanox.com>
Fri, 24 Feb 2017 10:16:33 +0000 (12:16 +0200)
committerSaeed Mahameed <saeedm@mellanox.com>
Sun, 30 Apr 2017 13:03:14 +0000 (16:03 +0300)
commitf6dfb4c3f2161c23ab2939dd1b5f133dcdf147c6
tree6cb4c342e3697ab32a22965834c852ceb29eefe6
parent232c001398ae8406dc0daf07b14e6ec9a5562719
net/mlx5e: Update neighbour 'used' state using HW flow rules counters

When IP tunnel encapsulation rules are offloaded, the kernel can't see
the traffic of the offloaded flow. The neighbour for the IP tunnel
destination of the offloaded flow can mistakenly become STALE and
deleted by the kernel since its 'used' value wasn't changed.

To make sure that a neighbour which is used by the HW won't become
STALE, we proactively update the neighbour 'used' value every
DELAY_PROBE_TIME period, when packets were matched and counted by the HW
for one of the tunnel encap flows related to this neighbour.

The periodic task that updates the used neighbours is scheduled when a
tunnel encap rule is successfully offloaded into HW and keeps re-scheduling
itself as long as the representor's neighbours list isn't empty.

Add, remove, lookup and status change operations done over the
representor's neighbours list or the neighbour hash entry encaps list
are all serialized by RTNL lock.

Signed-off-by: Hadar Hen Zion <hadarh@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
drivers/net/ethernet/mellanox/mlx5/core/en_rep.h
drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
drivers/net/ethernet/mellanox/mlx5/core/en_tc.h
drivers/net/ethernet/mellanox/mlx5/core/fs_core.h
drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c
include/linux/mlx5/driver.h