blob: 14f968e58b8f7103bc81db1f42996d6853f70317 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
* Copyright (c) 2017 Sagi Grimberg.
#include <linux/blk-mq.h>
#include <linux/blk-mq-rdma.h>
#include <rdma/ib_verbs.h>
* 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.
int 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 0;
return blk_mq_map_queues(map);