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Merge tag 'mlx5-updates-2020-11-03' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux
Saeed Mahameed says: ==================== mlx5-updates-2020-11-03 This series includes updates to mlx5 software steering component. 1) Few improvements in the DR area, such as removing unneeded checks, renaming to better general names, refactor in some places, etc. 2) Software steering (DR) Memory management improvements This patch series contains SW Steering memory management improvements: using buddy allocator instead of an existing bucket allocator, and several other optimizations. The buddy system is a memory allocation and management algorithm that manages memory in power of two increments. The algorithm is well-known and well-described, such as here: https://en.wikipedia.org/wiki/Buddy_memory_allocation Linux uses this algorithm for managing and allocating physical pages, as described here: https://www.kernel.org/doc/gorman/html/understand/understand009.html In our case, although the algorithm in principal is similar to the Linux physical page allocator, the "building blocks" and the circumstances are different: in SW steering, buddy allocator doesn't really allocates a memory, but rather manages ICM (Interconnect Context Memory) that was previously allocated and registered. The ICM memory that is used in SW steering is always power of 2 (order), so buddy system is a good fit for this. Patches in this series: [PATH 4] net/mlx5: DR, Add buddy allocator utilities This patch adds a modified implementation of a well-known buddy allocator, adjusted for SW steering needs: the algorithm in principal is similar to the Linux physical page allocator, but in our case buddy allocator doesn't really allocate a memory, but rather manages ICM memory that was previously allocated and registered. [PATH 5] net/mlx5: DR, Handle ICM memory via buddy allocation instead of bucket management This patch changes ICM management of SW steering to use buddy-system mechanism Instead of the previous bucket management. [PATH 6] net/mlx5: DR, Sync chunks only during free This patch makes syncing happen only when freeing memory chunks. [PATH 7] net/mlx5: DR, ICM memory pools sync optimization This patch adds tracking of pool's "hot" memory and makes the check whether steering sync is required much shorter and faster. [PATH 8] net/mlx5: DR, Free buddy ICM memory if it is unused This patch adds tracking buddy's used ICM memory, and frees the buddy if all its memory becomes unused. 3) Misc code cleanups * tag 'mlx5-updates-2020-11-03' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux: net: mlx5: Replace in_irq() usage net/mlx5: Cleanup kernel-doc warnings net/mlx4: Cleanup kernel-doc warnings net/mlx5e: Validate stop_room size upon user input net/mlx5: DR, Free unused buddy ICM memory net/mlx5: DR, ICM memory pools sync optimization net/mlx5: DR, Sync chunks only during free net/mlx5: DR, Handle ICM memory via buddy allocation instead of buckets net/mlx5: DR, Add buddy allocator utilities net/mlx5: DR, Rename matcher functions to be more HW agnostic net/mlx5: DR, Rename builders HW specific names net/mlx5: DR, Remove unused member of action struct ==================== Link: https://lore.kernel.org/r/20201105201242.21716-1-saeedm@nvidia.com Signed-off-by:Jakub Kicinski <kuba@kernel.org>