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43f55f23f7
Currently, we tie the struct mctp_dev lifetime to the underlying struct net_device, and hold/put that device as a proxy for a separate mctp_dev refcount. This works because we're not holding any references to the mctp_dev that are different from the netdev lifetime. In a future change we'll break that assumption though, as we'll need to hold mctp_dev references in a workqueue, which might live past the netdev unregister notification. In order to support that, this change introduces a refcount on the mctp_dev, currently taken by the net_device->mctp_ptr reference, and released on netdev unregister events. We can then use this for future references that might outlast the net device. Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
40 lines
841 B
C
40 lines
841 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Management Component Transport Protocol (MCTP) - device
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* definitions.
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*
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* Copyright (c) 2021 Code Construct
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* Copyright (c) 2021 Google
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*/
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#ifndef __NET_MCTPDEVICE_H
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#define __NET_MCTPDEVICE_H
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#include <linux/list.h>
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#include <linux/types.h>
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#include <linux/refcount.h>
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struct mctp_dev {
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struct net_device *dev;
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refcount_t refs;
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unsigned int net;
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/* Only modified under RTNL. Reads have addrs_lock held */
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u8 *addrs;
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size_t num_addrs;
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spinlock_t addrs_lock;
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struct rcu_head rcu;
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};
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#define MCTP_INITIAL_DEFAULT_NET 1
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struct mctp_dev *mctp_dev_get_rtnl(const struct net_device *dev);
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struct mctp_dev *__mctp_dev_get(const struct net_device *dev);
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void mctp_dev_hold(struct mctp_dev *mdev);
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void mctp_dev_put(struct mctp_dev *mdev);
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#endif /* __NET_MCTPDEVICE_H */
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