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block: Add rdma affinity based queue mapping helper

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Like pci and virtio, we add a rdma helper for affinity
spreading. This achieves optimal mq affinity assignments
according to the underlying rdma device affinity maps.

Reviewed-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Sagi Grimberg 2017-07-13 11:09:43 +03:00 committed by Doug Ledford
parent 40b24403f3
commit 24c5dc6610
4 changed files with 68 additions and 0 deletions
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5
block/Kconfig
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@ -206,4 +206,9 @@ config BLK_MQ_VIRTIO
depends on BLOCK && VIRTIO
default y
config BLK_MQ_RDMA
bool
depends on BLOCK && INFINIBAND
default y
source block/Kconfig.iosched

1
block/Makefile
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@ -29,6 +29,7 @@ obj-$(CONFIG_BLK_CMDLINE_PARSER) += cmdline-parser.o
obj-$(CONFIG_BLK_DEV_INTEGRITY) += bio-integrity.o blk-integrity.o t10-pi.o
obj-$(CONFIG_BLK_MQ_PCI) += blk-mq-pci.o
obj-$(CONFIG_BLK_MQ_VIRTIO) += blk-mq-virtio.o
obj-$(CONFIG_BLK_MQ_RDMA) += blk-mq-rdma.o
obj-$(CONFIG_BLK_DEV_ZONED) += blk-zoned.o
obj-$(CONFIG_BLK_WBT) += blk-wbt.o
obj-$(CONFIG_BLK_DEBUG_FS) += blk-mq-debugfs.o

52
block/blk-mq-rdma.c Normal file
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@ -0,0 +1,52 @@
/*
* 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);

10
include/linux/blk-mq-rdma.h Normal file
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@ -0,0 +1,10 @@
#ifndef _LINUX_BLK_MQ_RDMA_H
#define _LINUX_BLK_MQ_RDMA_H
struct blk_mq_tag_set;
struct ib_device;
int blk_mq_rdma_map_queues(struct blk_mq_tag_set *set,
struct ib_device *dev, int first_vec);
#endif /* _LINUX_BLK_MQ_RDMA_H */