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44 lines
1.3 KiB
44 lines
1.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2017 Sagi Grimberg. |
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*/ |
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#include <linux/blk-mq.h> |
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#include <linux/blk-mq-rdma.h> |
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#include <rdma/ib_verbs.h> |
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/** |
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* blk_mq_rdma_map_queues - provide a default queue mapping for rdma device |
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* @map: CPU to hardware queue map. |
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* @dev: rdma device to provide a mapping for. |
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* @first_vec: first interrupt vectors to use for queues (usually 0) |
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* |
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* This function assumes the rdma device @dev has at least as many available |
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* interrupt vetors as @set has queues. It will then query it's affinity mask |
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* and built queue mapping that maps a queue to the CPUs that have irq affinity |
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* for the corresponding vector. |
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* |
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* In case either the driver passed a @dev with less vectors than |
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* @set->nr_hw_queues, or @dev does not provide an affinity mask for a |
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* vector, we fallback to the naive mapping. |
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*/ |
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int blk_mq_rdma_map_queues(struct blk_mq_queue_map *map, |
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struct ib_device *dev, int first_vec) |
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{ |
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const struct cpumask *mask; |
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unsigned int queue, cpu; |
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for (queue = 0; queue < map->nr_queues; queue++) { |
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mask = ib_get_vector_affinity(dev, first_vec + queue); |
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if (!mask) |
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goto fallback; |
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for_each_cpu(cpu, mask) |
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map->mq_map[cpu] = map->queue_offset + queue; |
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} |
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return 0; |
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fallback: |
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return blk_mq_map_queues(map); |
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} |
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EXPORT_SYMBOL_GPL(blk_mq_rdma_map_queues);
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