mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
|
/*
|
||
|
|
* 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);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(blk_mq_rdma_map_queues);
|