Greetings: Welcome to v4. This series adds support to mlx4 for the netdev-genl API which makes it much easier for users and user programs to map NAPI IDs back to ifindexes, queues, and IRQs. This is extremely useful for a number of use cases, including epoll-based busy poll. In addition, this series includes a patch to generate per-queue statistics using the netlink API, as well. To facilitate the stats, patch 1/3 adds a field "alloc_fail" to the ring structure. incremented by the driver in an appropriate place and used in patch 3/3 as alloc_fail. Please note: I do not have access to mlx4 hardware, but I've been working closely with Martin Karsten from University of Waterloo (CC'd) who has very graciously tested my patches on their mlx4 hardware (hence his Tested-by attribution in each commit). His latest research work is particularly interesting [1] and this series helps to support that (and future) work. Martin re-test v4 using Jakub's suggested tool [2] and the stats.pkt_byte_sum and stats.qstat_by_ifindex tests passed. He also adjusted the queue count and re-ran test to confirm it still passed even if the queue count was modified. [1]: https://dl.acm.org/doi/pdf/10.1145/3626780 [2]: https://lore.kernel.org/lkml/20240423175718.4ad4dc5a@xxxxxxxxxx/ Thanks, Joe v3 -> v4: - Patch 1/3: adds alloc_fail field to struct mlx4_en_rx_ring. Increments this new field (instead of dropped as in the last version) on ENOMEM in mlx4_en_alloc_frags. - Patch 2/3: No changes. - Patch 3/3: - Removed Jakub's Reviewed-by since some number of changes were made. - Removed checking the validity of 'i' from both mlx4_get_queue_stats_[rt]x as the core code will ensure i is valid for us. - stats->alloc_fail now uses the new field added in patch 1/3 instead of dropped. v2 -> v3: - Patch 1/3 no longer sets rx_missed_errors. dropped is still incremented on -ENOMEM, though, and reported as alloc_fail in the stats API introduced in patch 3/3. - Patch 2/3: Added Jakub's Acked-by to the commit message, no functional changes. - Patch 3/3: Added Jakub's Reviewed-by to the commit message, no functional changes. v1 -> v2: - Patch 1/3 now initializes dropped to 0. - Patch 2/3 fix use of uninitialized qtype warning. - Patch 3/3 includes several changes: - mlx4_get_queue_stats_rx and mlx4_get_queue_stats_tx check if i is valid before proceeding. - All initialization to 0xff for stats fields has been omit. The network stack does this before calling into the driver functions, so I've adjusted the driver functions to only set values if there is data to set, leaving the network stack's 0xff in place if not. - mlx4_get_base_stats set all stat fields to 0 individually if there are RX and TX queues. Joe Damato (3): net/mlx4: Track RX allocation failures in a stat net/mlx4: link NAPI instances to queues and IRQs net/mlx4: support per-queue statistics via netlink drivers/net/ethernet/mellanox/mlx4/en_cq.c | 14 ++++ .../net/ethernet/mellanox/mlx4/en_netdev.c | 73 +++++++++++++++++++ drivers/net/ethernet/mellanox/mlx4/en_rx.c | 4 +- drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 2 + 4 files changed, 92 insertions(+), 1 deletion(-) -- 2.25.1
