path: root/net/smc/smc_pnet.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  Shared Memory Communications over RDMA (SMC-R) and RoCE
 *
 *  Generic netlink support functions to configure an SMC-R PNET table
 *
 *  Copyright IBM Corp. 2016
 *
 *  Author(s):  Thomas Richter <tmricht@linux.vnet.ibm.com>
 */

#include <linux/module.h>
#include <linux/list.h>
#include <linux/ctype.h>
#include <linux/mutex.h>
#include <net/netlink.h>
#include <net/genetlink.h>

#include <uapi/linux/if.h>
#include <uapi/linux/smc.h>

#include <rdma/ib_verbs.h>

#include <net/netns/generic.h>
#include "smc_netns.h"

#include "smc_pnet.h"
#include "smc_ib.h"
#include "smc_ism.h"
#include "smc_core.h"

static struct net_device *__pnet_find_base_ndev(struct net_device *ndev);
static struct net_device *pnet_find_base_ndev(struct net_device *ndev);

static const struct nla_policy smc_pnet_policy[SMC_PNETID_MAX + 1] = {
	[SMC_PNETID_NAME] = {
		.type = NLA_NUL_STRING,
		.len = SMC_MAX_PNETID_LEN
	},
	[SMC_PNETID_ETHNAME] = {
		.type = NLA_NUL_STRING,
		.len = IFNAMSIZ - 1
	},
	[SMC_PNETID_IBNAME] = {
		.type = NLA_NUL_STRING,
		.len = IB_DEVICE_NAME_MAX - 1
	},
	[SMC_PNETID_IBPORT] = { .type = NLA_U8 }
};

static struct genl_family smc_pnet_nl_family;

enum smc_pnet_nametype {
	SMC_PNET_ETH	= 1,
	SMC_PNET_IB	= 2,
};

/* pnet entry stored in pnet table */
struct smc_pnetentry {
	struct list_head list;
	char pnet_name[SMC_MAX_PNETID_LEN + 1];
	enum smc_pnet_nametype type;
	union {
		struct {
			char eth_name[IFNAMSIZ + 1];
			struct net_device *ndev;
			netdevice_tracker dev_tracker;
		};
		struct {
			char ib_name[IB_DEVICE_NAME_MAX + 1];
			u8 ib_port;
		};
	};
};

/* Check if the pnetid is set */
bool smc_pnet_is_pnetid_set(u8 *pnetid)
{
	if (pnetid[0] == 0 || pnetid[0] == _S)
		return false;
	return true;
}

/* Check if two given pnetids match */
static bool smc_pnet_match(u8 *pnetid1, u8 *pnetid2)
{
	int i;

	for (i = 0; i < SMC_MAX_PNETID_LEN; i++) {
		if ((pnetid1[i] == 0 || pnetid1[i] == _S) &&
		    (pnetid2[i] == 0 || pnetid2[i] == _S))
			break;
		if (pnetid1[i] != pnetid2[i])
			return false;
	}
	return true;
}

/* Remove a pnetid from the pnet table.
 */
static int smc_pnet_remove_by_pnetid(struct net *net, char *pnet_name)
{
	struct smc_pnetentry *pnetelem, *tmp_pe;
	struct smc_pnettable *pnettable;
	struct smc_ib_device *ibdev;
	struct smcd_dev *smcd_dev;
	struct smc_net *sn;
	int rc = -ENOENT;
	int ibport;

	/* get pnettable for namespace */
	sn = net_generic(net, smc_net_id);
	pnettable = &sn->pnettable;

	/* remove table entry */
	mutex_lock(&pnettable->lock);
	list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist,
				 list) {
		if (!pnet_name ||
		    smc_pnet_match(pnetelem->pnet_name, pnet_name)) {
			list_del(&pnetelem->list);
			if (pnetelem->type == SMC_PNET_ETH && pnetelem->ndev) {
				netdev_put(pnetelem->ndev,
					   &pnetelem->dev_tracker);
				pr_warn_ratelimited("smc: net device %s "
						    "erased user defined "
						    "pnetid %.16s\n",
						    pnetelem->eth_name,
						    pnetelem->pnet_name);
			}
			kfree(pnetelem);
			rc = 0;
		}
	}
	mutex_unlock(&pnettable->lock);

	/* if this is not the initial namespace, stop here */
	if (net !=