linux/net/sunrpc/xprtrdma/ib_client.c

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright (c) 2024 Oracle.  All rights reserved.
 */

/* #include <linux/module.h>
#include <linux/slab.h> */
#include <linux/xarray.h>
#include <linux/types.h>
#include <linux/kref.h>
#include <linux/completion.h>

#include <linux/sunrpc/svc_rdma.h>
#include <linux/sunrpc/rdma_rn.h>

#include "xprt_rdma.h"
#include <trace/events/rpcrdma.h>

/* Per-ib_device private data for rpcrdma */
struct rpcrdma_device { … };

#define RPCRDMA_RD_F_REMOVING …

static struct ib_client rpcrdma_ib_client;

/*
 * Listeners have no associated device, so we never register them.
 * Note that ib_get_client_data() does not check if @device is
 * NULL for us.
 */
static struct rpcrdma_device *rpcrdma_get_client_data(struct ib_device *device)
{ … }

/**
 * rpcrdma_rn_register - register to get device removal notifications
 * @device: device to monitor
 * @rn: notification object that wishes to be notified
 * @done: callback to notify caller of device removal
 *
 * Returns zero on success. The callback in rn_done is guaranteed
 * to be invoked when the device is removed, unless this notification
 * is unregistered first.
 *
 * On failure, a negative errno is returned.
 */
int rpcrdma_rn_register(struct ib_device *device,
			struct rpcrdma_notification *rn,
			void (*done)(struct rpcrdma_notification *rn))
{ … }

static void rpcrdma_rn_release(struct kref *kref)
{ … }

/**
 * rpcrdma_rn_unregister - stop device removal notifications
 * @device: monitored device
 * @rn: notification object that no longer wishes to be notified
 */
void rpcrdma_rn_unregister(struct ib_device *device,
			   struct rpcrdma_notification *rn)
{ … }

/**
 * rpcrdma_add_one - ib_client device insertion callback
 * @device: device about to be inserted
 *
 * Returns zero on success. xprtrdma private data has been allocated
 * for this device. On failure, a negative errno is returned.
 */
static int rpcrdma_add_one(struct ib_device *device)
{ … }

/**
 * rpcrdma_remove_one - ib_client device removal callback
 * @device: device about to be removed
 * @client_data: this module's private per-device data
 *
 * Upon return, all transports associated with @device have divested
 * themselves from IB hardware resources.
 */
static void rpcrdma_remove_one(struct ib_device *device,
			       void *client_data)
{ … }

static struct ib_client rpcrdma_ib_client = …;

/**
 * rpcrdma_ib_client_unregister - unregister ib_client for xprtrdma
 *
 * cel: watch for orphaned rpcrdma_device objects on module unload
 */
void rpcrdma_ib_client_unregister(void)
{ … }

/**
 * rpcrdma_ib_client_register - register ib_client for rpcrdma
 *
 * Returns zero on success, or a negative errno.
 */
int rpcrdma_ib_client_register(void)
{ … }