cregit-Linux how code gets into the kernel

Release 4.18 block/blk-mq-rdma.c

Directory: block
 * Copyright (c) 2017 Sagi Grimberg.
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
#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
 * @set:        tagset to provide the mapping for
 * @dev:        rdma device associated with @set.
 * @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_tag_set *set, struct ib_device *dev, int first_vec) { const struct cpumask *mask; unsigned int queue, cpu; for (queue = 0; queue < set->nr_hw_queues; queue++) { mask = ib_get_vector_affinity(dev, first_vec + queue); if (!mask) goto fallback; for_each_cpu(cpu, mask) set->mq_map[cpu] = queue; } return 0; fallback: return blk_mq_map_queues(set); }


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Directory: block
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