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Jason Gunthorpe
50d5c02ab8
Sashiko points out that, due to rereg_mr, the PD is actually variable and
all the touches in nldev are racy.
Use mr->device instead of mr->pd->device.
Getting the PD restrack ID is more tricky. To avoid disturbing all the
happy paths, add an rdma_restrack_sync() operation which is sort of like
flush_workqueue() or synchronize_irq(): after it returns, all the old
nldev touches to the mr are gone and everything sees the new PD. This
makes it safe to reach into the PD pointer.
Fixes: da5c850782 ("RDMA/nldev: add driver-specific resource tracking")
Link: https://patch.msgid.link/r/4-v1-29ebd2c229b5+fd5-ib_mr_pd_jgg@nvidia.com
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
38 lines
1.1 KiB
C
38 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
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/*
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* Copyright (c) 2017-2019 Mellanox Technologies. All rights reserved.
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*/
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#ifndef _RDMA_CORE_RESTRACK_H_
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#define _RDMA_CORE_RESTRACK_H_
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#include <linux/mutex.h>
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/**
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* struct rdma_restrack_root - main resource tracking management
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* entity, per-device
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*/
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struct rdma_restrack_root {
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/**
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* @xa: Array of XArray structure to hold restrack entries.
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*/
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struct xarray xa;
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/**
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* @next_id: Next ID to support cyclic allocation
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*/
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u32 next_id;
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};
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int rdma_restrack_init(struct ib_device *dev);
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void rdma_restrack_clean(struct ib_device *dev);
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void rdma_restrack_add(struct rdma_restrack_entry *res);
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void rdma_restrack_del(struct rdma_restrack_entry *res);
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void rdma_restrack_sync(struct rdma_restrack_entry *res);
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void rdma_restrack_new(struct rdma_restrack_entry *res,
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enum rdma_restrack_type type);
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void rdma_restrack_set_name(struct rdma_restrack_entry *res,
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const char *caller);
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void rdma_restrack_parent_name(struct rdma_restrack_entry *dst,
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const struct rdma_restrack_entry *parent);
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#endif /* _RDMA_CORE_RESTRACK_H_ */
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