net/mlx5: Change flow counters addlist type to single linked list

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In order to prevent flow counters stats work function from traversing whole
flow counters tree while searching for deleted flow counters, new list to
store deleted flow counters will be added to struct mlx5_fc_stats. However,
the flow counter structure itself has no space left to store any more data
in first cache line. To free space that is needed to store additional list
node, convert current addlist double linked list (two pointers per node) to
atomic single linked list (one pointer per node).

Lockless NULL-terminated single linked list data type doesn't require any
additional external synchronization for operations used by flow counters
module (add single new element, remove all elements from list and traverse
them). Remove addlist_lock that is no longer needed.

Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Acked-by: Amir Vadai <amir@vadai.me>
Reviewed-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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This commit is contained in:

Vlad Buslov 2018-07-23 10:55:39 +03:00 • committed by Saeed Mahameed

parent 05dcc71298

commit 83033688b7

3 changed files with 23 additions and 29 deletions

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3

drivers/net/ethernet/mellanox/mlx5/core/fs_core.h

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45

drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c

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4

include/linux/mlx5/driver.h

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