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The mlx5 driver have a special drop-RQ queue (one per interface) that simply drops all incoming traffic. It helps driver keep other HW objects (flow steering) alive upon down/up operations. It is temporarily pointed by flow steering objects during the interface setup, and when interface is down. It lacks many fields that are set in a regular RQ (for example its state is never switched to MLX5_RQC_STATE_RDY). (Thanks to Tariq Toukan for explanation). The XDP RX-queue info for this drop-RQ marked as unused, which allow us to use the same takedown/free code path as other RX-queues. Driver hook points for xdp_rxq_info: * reg : mlx5e_alloc_rq() * unused: mlx5e_alloc_drop_rq() * unreg : mlx5e_free_rq() Tested on actual hardware with samples/bpf program Cc: Saeed Mahameed <saeedm@mellanox.com> Cc: Matan Barak <matanb@mellanox.com> Cc: Tariq Toukan <tariqt@mellanox.com> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.