From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- block/blk-mq-rdma.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 block/blk-mq-rdma.c (limited to 'block/blk-mq-rdma.c') diff --git a/block/blk-mq-rdma.c b/block/blk-mq-rdma.c new file mode 100644 index 000000000..29c1f4d6e --- /dev/null +++ b/block/blk-mq-rdma.c @@ -0,0 +1,44 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2017 Sagi Grimberg. + */ +#include +#include +#include + +/** + * blk_mq_rdma_map_queues - provide a default queue mapping for rdma device + * @map: CPU to hardware queue map. + * @dev: rdma device to provide a mapping for. + * @first_vec: first interrupt vectors to use for queues (usually 0) + * + * This function assumes the rdma device @dev has at least as many available + * interrupt vetors as @set has queues. It will then query it's affinity mask + * and built queue mapping that maps a queue to the CPUs that have irq affinity + * for the corresponding vector. + * + * In case either the driver passed a @dev with less vectors than + * @set->nr_hw_queues, or @dev does not provide an affinity mask for a + * vector, we fallback to the naive mapping. + */ +void blk_mq_rdma_map_queues(struct blk_mq_queue_map *map, + struct ib_device *dev, int first_vec) +{ + const struct cpumask *mask; + unsigned int queue, cpu; + + for (queue = 0; queue < map->nr_queues; queue++) { + mask = ib_get_vector_affinity(dev, first_vec + queue); + if (!mask) + goto fallback; + + for_each_cpu(cpu, mask) + map->mq_map[cpu] = map->queue_offset + queue; + } + + return; + +fallback: + blk_mq_map_queues(map); +} +EXPORT_SYMBOL_GPL(blk_mq_rdma_map_queues); -- cgit v1.2.3