]> git.baikalelectronics.ru Git - kernel.git/commit
IB/mlx5: Implement fragmented completion queue (CQ)
authorYonatan Cohen <yonatanc@mellanox.com>
Tue, 2 Jan 2018 14:08:06 +0000 (16:08 +0200)
committerSaeed Mahameed <saeedm@mellanox.com>
Thu, 15 Feb 2018 08:30:03 +0000 (00:30 -0800)
commit22bb2345f8671dc7b7d33c0149d1bf8e6165d7ca
treec947d371b76ffea3a91b0b042295654f7751f3a5
parent240b08aa2287bc4704525f1f32af578ebb3a724a
IB/mlx5: Implement fragmented completion queue (CQ)

The current implementation of create CQ requires contiguous
memory, such requirement is problematic once the memory is
fragmented or the system is low in memory, it causes for
failures in dma_zalloc_coherent().

This patch implements new scheme of fragmented CQ to overcome
this issue by introducing new type: 'struct mlx5_frag_buf_ctrl'
to allocate fragmented buffers, rather than contiguous ones.

Base the Completion Queues (CQs) on this new fragmented buffer.

It fixes following crashes:
kworker/29:0: page allocation failure: order:6, mode:0x80d0
CPU: 29 PID: 8374 Comm: kworker/29:0 Tainted: G OE 3.10.0
Workqueue: ib_cm cm_work_handler [ib_cm]
Call Trace:
[<>] dump_stack+0x19/0x1b
[<>] warn_alloc_failed+0x110/0x180
[<>] __alloc_pages_slowpath+0x6b7/0x725
[<>] __alloc_pages_nodemask+0x405/0x420
[<>] dma_generic_alloc_coherent+0x8f/0x140
[<>] x86_swiotlb_alloc_coherent+0x21/0x50
[<>] mlx5_dma_zalloc_coherent_node+0xad/0x110 [mlx5_core]
[<>] ? mlx5_db_alloc_node+0x69/0x1b0 [mlx5_core]
[<>] mlx5_buf_alloc_node+0x3e/0xa0 [mlx5_core]
[<>] mlx5_buf_alloc+0x14/0x20 [mlx5_core]
[<>] create_cq_kernel+0x90/0x1f0 [mlx5_ib]
[<>] mlx5_ib_create_cq+0x3b0/0x4e0 [mlx5_ib]

Signed-off-by: Yonatan Cohen <yonatanc@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
drivers/infiniband/hw/mlx5/cq.c
drivers/infiniband/hw/mlx5/mlx5_ib.h
drivers/net/ethernet/mellanox/mlx5/core/alloc.c
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
drivers/net/ethernet/mellanox/mlx5/core/wq.c
drivers/net/ethernet/mellanox/mlx5/core/wq.h
include/linux/mlx5/driver.h