net/mlx5e: Protect neigh hash encap list with spinlock and rcu
Rcu-ify mlx5e_neigh_hash_entry->encap_list by changing operations on encap list to their rcu counterparts and extending encap structure with rcu_head to free the encap instances after rcu grace period. Use rcu read lock when traversing encap list. Implement helper mlx5e_get_next_valid_encap() function that is used by mlx5e_tc_update_neigh_used_value() to safely iterate over valid entries of nhe->encap_list. Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Reviewed-by: Jianbo Liu <jianbol@mellanox.com> Reviewed-by: Roi Dayan <roid@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
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