Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1174 insertions, 0 deletions

diff --git a/net/smc/smc_pnet.c b/net/smc/smc_pnet.c
new file mode 100644
index 000000000..30bae60d6
--- /dev/null
+++ b/net/smc/smc_pnet.c
@@ -0,0 +1,1174 @@
+// 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;
+		};
+		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) {
+				dev_put(pnetelem->ndev);
+				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 != &init_net)
+		return rc;
+
+	/* remove ib devices */
+	mutex_lock(&smc_ib_devices.mutex);
+	list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
+		for (ibport = 0; ibport < SMC_MAX_PORTS; ibport++) {
+			if (ibdev->pnetid_by_user[ibport] &&
+			    (!pnet_name ||
+			     smc_pnet_match(pnet_name,
+					    ibdev->pnetid[ibport]))) {
+				pr_warn_ratelimited("smc: ib device %s ibport "
+						    "%d erased user defined "
+						    "pnetid %.16s\n",
+						    ibdev->ibdev->name,
+						    ibport + 1,
+						    ibdev->pnetid[ibport]);
+				memset(ibdev->pnetid[ibport], 0,
+				       SMC_MAX_PNETID_LEN);
+				ibdev->pnetid_by_user[ibport] = false;
+				rc = 0;
+			}
+		}
+	}
+	mutex_unlock(&smc_ib_devices.mutex);
+	/* remove smcd devices */
+	mutex_lock(&smcd_dev_list.mutex);
+	list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
+		if (smcd_dev->pnetid_by_user &&
+		    (!pnet_name ||
+		     smc_pnet_match(pnet_name, smcd_dev->pnetid))) {
+			pr_warn_ratelimited("smc: smcd device %s "
+					    "erased user defined pnetid "
+					    "%.16s\n", dev_name(&smcd_dev->dev),
+					    smcd_dev->pnetid);
+			memset(smcd_dev->pnetid, 0, SMC_MAX_PNETID_LEN);
+			smcd_dev->pnetid_by_user = false;
+			rc = 0;
+		}
+	}
+	mutex_unlock(&smcd_dev_list.mutex);
+	return rc;
+}
+
+/* Add the reference to a given network device to the pnet table.
+ */
+static int smc_pnet_add_by_ndev(struct net_device *ndev)
+{
+	struct smc_pnetentry *pnetelem, *tmp_pe;
+	struct smc_pnettable *pnettable;
+	struct net *net = dev_net(ndev);
+	struct smc_net *sn;
+	int rc = -ENOENT;
+
+	/* get pnettable for namespace */
+	sn = net_generic(net, smc_net_id);
+	pnettable = &sn->pnettable;
+
+	mutex_lock(&pnettable->lock);
+	list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist, list) {
+		if (pnetelem->type == SMC_PNET_ETH && !pnetelem->ndev &&
+		    !strncmp(pnetelem->eth_name, ndev->name, IFNAMSIZ)) {
+			dev_hold(ndev);
+			pnetelem->ndev = ndev;
+			rc = 0;
+			pr_warn_ratelimited("smc: adding net device %s with "
+					    "user defined pnetid %.16s\n",
+					    pnetelem->eth_name,
+					    pnetelem->pnet_name);
+			break;
+		}
+	}
+	mutex_unlock(&pnettable->lock);
+	return rc;
+}
+
+/* Remove the reference to a given network device from the pnet table.
+ */
+static int smc_pnet_remove_by_ndev(struct net_device *ndev)
+{
+	struct smc_pnetentry *pnetelem, *tmp_pe;
+	struct smc_pnettable *pnettable;
+	struct net *net = dev_net(ndev);
+	struct smc_net *sn;
+	int rc = -ENOENT;
+
+	/* get pnettable for namespace */
+	sn = net_generic(net, smc_net_id);
+	pnettable = &sn->pnettable;
+
+	mutex_lock(&pnettable->lock);
+	list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist, list) {
+		if (pnetelem->type == SMC_PNET_ETH && pnetelem->ndev == ndev) {
+			dev_put(pnetelem->ndev);
+			pnetelem->ndev = NULL;
+			rc = 0;
+			pr_warn_ratelimited("smc: removing net device %s with "
+					    "user defined pnetid %.16s\n",
+					    pnetelem->eth_name,
+					    pnetelem->pnet_name);
+			break;
+		}
+	}
+	mutex_unlock(&pnettable->lock);
+	return rc;
+}
+
+/* Apply pnetid to ib device when no pnetid is set.
+ */
+static bool smc_pnet_apply_ib(struct smc_ib_device *ib_dev, u8 ib_port,
+			      char *pnet_name)
+{
+	bool applied = false;
+
+	mutex_lock(&smc_ib_devices.mutex);
+	if (!smc_pnet_is_pnetid_set(ib_dev->pnetid[ib_port - 1])) {
+		memcpy(ib_dev->pnetid[ib_port - 1], pnet_name,
+		       SMC_MAX_PNETID_LEN);
+		ib_dev->pnetid_by_user[ib_port - 1] = true;
+		applied = true;
+	}
+	mutex_unlock(&smc_ib_devices.mutex);
+	return applied;
+}
+
+/* Apply pnetid to smcd device when no pnetid is set.
+ */
+static bool smc_pnet_apply_smcd(struct smcd_dev *smcd_dev, char *pnet_name)
+{
+	bool applied = false;
+
+	mutex_lock(&smcd_dev_list.mutex);
+	if (!smc_pnet_is_pnetid_set(smcd_dev->pnetid)) {
+		memcpy(smcd_dev->pnetid, pnet_name, SMC_MAX_PNETID_LEN);
+		smcd_dev->pnetid_by_user = true;
+		applied = true;
+	}
+	mutex_unlock(&smcd_dev_list.mutex);
+	return applied;
+}
+
+/* The limit for pnetid is 16 characters.
+ * Valid characters should be (single-byte character set) a-z, A-Z, 0-9.
+ * Lower case letters are converted to upper case.
+ * Interior blanks should not be used.
+ */
+static bool smc_pnetid_valid(const char *pnet_name, char *pnetid)
+{
+	char *bf = skip_spaces(pnet_name);
+	size_t len = strlen(bf);
+	char *end = bf + len;
+
+	if (!len)
+		return false;
+	while (--end >= bf && isspace(*end))
+		;
+	if (end - bf >= SMC_MAX_PNETID_LEN)
+		return false;
+	while (bf <= end) {
+		if (!isalnum(*bf))
+			return false;
+		*pnetid++ = islower(*bf) ? toupper(*bf) : *bf;
+		bf++;
+	}
+	*pnetid = '\0';
+	return true;
+}
+
+/* Find an infiniband device by a given name. The device might not exist. */
+static struct smc_ib_device *smc_pnet_find_ib(char *ib_name)
+{
+	struct smc_ib_device *ibdev;
+
+	mutex_lock(&smc_ib_devices.mutex);
+	list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
+		if (!strncmp(ibdev->ibdev->name, ib_name,
+			     sizeof(ibdev->ibdev->name)) ||
+		    (ibdev->ibdev->dev.parent &&
+		     !strncmp(dev_name(ibdev->ibdev->dev.parent), ib_name,
+			     IB_DEVICE_NAME_MAX - 1))) {
+			goto out;
+		}
+	}
+	ibdev = NULL;
+out:
+	mutex_unlock(&smc_ib_devices.mutex);
+	return ibdev;
+}
+
+/* Find an smcd device by a given name. The device might not exist. */
+static struct smcd_dev *smc_pnet_find_smcd(char *smcd_name)
+{
+	struct smcd_dev *smcd_dev;
+
+	mutex_lock(&smcd_dev_list.mutex);
+	list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
+		if (!strncmp(dev_name(&smcd_dev->dev), smcd_name,
+			     IB_DEVICE_NAME_MAX - 1))
+			goto out;
+	}
+	smcd_dev = NULL;
+out:
+	mutex_unlock(&smcd_dev_list.mutex);
+	return smcd_dev;
+}
+
+static int smc_pnet_add_eth(struct smc_pnettable *pnettable, struct net *net,
+			    char *eth_name, char *pnet_name)
+{
+	struct smc_pnetentry *tmp_pe, *new_pe;
+	struct net_device *ndev, *base_ndev;
+	u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
+	bool new_netdev;
+	int rc;
+
+	/* check if (base) netdev already has a pnetid. If there is one, we do
+	 * not want to add a pnet table entry
+	 */
+	rc = -EEXIST;
+	ndev = dev_get_by_name(net, eth_name);	/* dev_hold() */
+	if (ndev) {
+		base_ndev = pnet_find_base_ndev(ndev);
+		if (!smc_pnetid_by_dev_port(base_ndev->dev.parent,
+					    base_ndev->dev_port, ndev_pnetid))
+			goto out_put;
+	}
+
+	/* add a new netdev entry to the pnet table if there isn't one */
+	rc = -ENOMEM;
+	new_pe = kzalloc(sizeof(*new_pe), GFP_KERNEL);
+	if (!new_pe)
+		goto out_put;
+	new_pe->type = SMC_PNET_ETH;
+	memcpy(new_pe->pnet_name, pnet_name, SMC_MAX_PNETID_LEN);
+	strncpy(new_pe->eth_name, eth_name, IFNAMSIZ);
+	new_pe->ndev = ndev;
+
+	rc = -EEXIST;
+	new_netdev = true;
+	mutex_lock(&pnettable->lock);
+	list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) {
+		if (tmp_pe->type == SMC_PNET_ETH &&
+		    !strncmp(tmp_pe->eth_name, eth_name, IFNAMSIZ)) {
+			new_netdev = false;
+			break;
+		}
+	}
+	if (new_netdev) {
+		list_add_tail(&new_pe->list, &pnettable->pnetlist);
+		mutex_unlock(&pnettable->lock);
+	} else {
+		mutex_unlock(&pnettable->lock);
+		kfree(new_pe);
+		goto out_put;
+	}
+	if (ndev)
+		pr_warn_ratelimited("smc: net device %s "
+				    "applied user defined pnetid %.16s\n",
+				    new_pe->eth_name, new_pe->pnet_name);
+	return 0;
+
+out_put:
+	if (ndev)
+		dev_put(ndev);
+	return rc;
+}
+
+static int smc_pnet_add_ib(struct smc_pnettable *pnettable, char *ib_name,
+			   u8 ib_port, char *pnet_name)
+{
+	struct smc_pnetentry *tmp_pe, *new_pe;
+	struct smc_ib_device *ib_dev;
+	bool smcddev_applied = true;
+	bool ibdev_applied = true;
+	struct smcd_dev *smcd_dev;
+	bool new_ibdev;
+
+	/* try to apply the pnetid to active devices */
+	ib_dev = smc_pnet_find_ib(ib_name);
+	if (ib_dev) {
+		ibdev_applied = smc_pnet_apply_ib(ib_dev, ib_port, pnet_name);
+		if (ibdev_applied)
+			pr_warn_ratelimited("smc: ib device %s ibport %d "
+					    "applied user defined pnetid "
+					    "%.16s\n", ib_dev->ibdev->name,
+					    ib_port,
+					    ib_dev->pnetid[ib_port - 1]);
+	}
+	smcd_dev = smc_pnet_find_smcd(ib_name);
+	if (smcd_dev) {
+		smcddev_applied = smc_pnet_apply_smcd(smcd_dev, pnet_name);
+		if (smcddev_applied)
+			pr_warn_ratelimited("smc: smcd device %s "
+					    "applied user defined pnetid "
+					    "%.16s\n", dev_name(&smcd_dev->dev),
+					    smcd_dev->pnetid);
+	}
+	/* Apply fails when a device has a hardware-defined pnetid set, do not
+	 * add a pnet table entry in that case.
+	 */
+	if (!ibdev_applied || !smcddev_applied)
+		return -EEXIST;
+
+	/* add a new ib entry to the pnet table if there isn't one */
+	new_pe = kzalloc(sizeof(*new_pe), GFP_KERNEL);
+	if (!new_pe)
+		return -ENOMEM;
+	new_pe->type = SMC_PNET_IB;
+	memcpy(new_pe->pnet_name, pnet_name, SMC_MAX_PNETID_LEN);
+	strncpy(new_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX);
+	new_pe->ib_port = ib_port;
+
+	new_ibdev = true;
+	mutex_lock(&pnettable->lock);
+	list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) {
+		if (tmp_pe->type == SMC_PNET_IB &&
+		    !strncmp(tmp_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX)) {
+			new_ibdev = false;
+			break;
+		}
+	}
+	if (new_ibdev) {
+		list_add_tail(&new_pe->list, &pnettable->pnetlist);
+		mutex_unlock(&pnettable->lock);
+	} else {
+		mutex_unlock(&pnettable->lock);
+		kfree(new_pe);
+	}
+	return (new_ibdev) ? 0 : -EEXIST;
+}
+
+/* Append a pnetid to the end of the pnet table if not already on this list.
+ */
+static int smc_pnet_enter(struct net *net, struct nlattr *tb[])
+{
+	char pnet_name[SMC_MAX_PNETID_LEN + 1];
+	struct smc_pnettable *pnettable;
+	bool new_netdev = false;
+	bool new_ibdev = false;
+	struct smc_net *sn;
+	u8 ibport = 1;
+	char *string;
+	int rc;
+
+	/* get pnettable for namespace */
+	sn = net_generic(net, smc_net_id);
+	pnettable = &sn->pnettable;
+
+	rc = -EINVAL;
+	if (!tb[SMC_PNETID_NAME])
+		goto error;
+	string = (char *)nla_data(tb[SMC_PNETID_NAME]);
+	if (!smc_pnetid_valid(string, pnet_name))
+		goto error;
+
+	if (tb[SMC_PNETID_ETHNAME]) {
+		string = (char *)nla_data(tb[SMC_PNETID_ETHNAME]);
+		rc = smc_pnet_add_eth(pnettable, net, string, pnet_name);
+		if (!rc)
+			new_netdev = true;
+		else if (rc != -EEXIST)
+			goto error;
+	}
+
+	/* if this is not the initial namespace, stop here */
+	if (net != &init_net)
+		return new_netdev ? 0 : -EEXIST;
+
+	rc = -EINVAL;
+	if (tb[SMC_PNETID_IBNAME]) {
+		string = (char *)nla_data(tb[SMC_PNETID_IBNAME]);
+		string = strim(string);
+		if (tb[SMC_PNETID_IBPORT]) {
+			ibport = nla_get_u8(tb[SMC_PNETID_IBPORT]);
+			if (ibport < 1 || ibport > SMC_MAX_PORTS)
+				goto error;
+		}
+		rc = smc_pnet_add_ib(pnettable, string, ibport, pnet_name);
+		if (!rc)
+			new_ibdev = true;
+		else if (rc != -EEXIST)
+			goto error;
+	}
+	return (new_netdev || new_ibdev) ? 0 : -EEXIST;
+
+error:
+	return rc;
+}
+
+/* Convert an smc_pnetentry to a netlink attribute sequence */
+static int smc_pnet_set_nla(struct sk_buff *msg,
+			    struct smc_pnetentry *pnetelem)
+{
+	if (nla_put_string(msg, SMC_PNETID_NAME, pnetelem->pnet_name))
+		return -1;
+	if (pnetelem->type == SMC_PNET_ETH) {
+		if (nla_put_string(msg, SMC_PNETID_ETHNAME,
+				   pnetelem->eth_name))
+			return -1;
+	} else {
+		if (nla_put_string(msg, SMC_PNETID_ETHNAME, "n/a"))
+			return -1;
+	}
+	if (pnetelem->type == SMC_PNET_IB) {
+		if (nla_put_string(msg, SMC_PNETID_IBNAME, pnetelem->ib_name) ||
+		    nla_put_u8(msg, SMC_PNETID_IBPORT, pnetelem->ib_port))
+			return -1;
+	} else {
+		if (nla_put_string(msg, SMC_PNETID_IBNAME, "n/a") ||
+		    nla_put_u8(msg, SMC_PNETID_IBPORT, 0xff))
+			return -1;
+	}
+
+	return 0;
+}
+
+static int smc_pnet_add(struct sk_buff *skb, struct genl_info *info)
+{
+	struct net *net = genl_info_net(info);
+
+	return smc_pnet_enter(net, info->attrs);
+}
+
+static int smc_pnet_del(struct sk_buff *skb, struct genl_info *info)
+{
+	struct net *net = genl_info_net(info);
+
+	if (!info->attrs[SMC_PNETID_NAME])
+		return -EINVAL;
+	return smc_pnet_remove_by_pnetid(net,
+				(char *)nla_data(info->attrs[SMC_PNETID_NAME]));
+}
+
+static int smc_pnet_dump_start(struct netlink_callback *cb)
+{
+	cb->args[0] = 0;
+	return 0;
+}
+
+static int smc_pnet_dumpinfo(struct sk_buff *skb,
+			     u32 portid, u32 seq, u32 flags,
+			     struct smc_pnetentry *pnetelem)
+{
+	void *hdr;
+
+	hdr = genlmsg_put(skb, portid, seq, &smc_pnet_nl_family,
+			  flags, SMC_PNETID_GET);
+	if (!hdr)
+		return -ENOMEM;
+	if (smc_pnet_set_nla(skb, pnetelem) < 0) {
+		genlmsg_cancel(skb, hdr);
+		return -EMSGSIZE;
+	}
+	genlmsg_end(skb, hdr);
+	return 0;
+}
+
+static int _smc_pnet_dump(struct net *net, struct sk_buff *skb, u32 portid,
+			  u32 seq, u8 *pnetid, int start_idx)
+{
+	struct smc_pnettable *pnettable;
+	struct smc_pnetentry *pnetelem;
+	struct smc_net *sn;
+	int idx = 0;
+
+	/* get pnettable for namespace */
+	sn = net_generic(net, smc_net_id);
+	pnettable = &sn->pnettable;
+
+	/* dump pnettable entries */
+	mutex_lock(&pnettable->lock);
+	list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
+		if (pnetid && !smc_pnet_match(pnetelem->pnet_name, pnetid))
+			continue;
+		if (idx++ < start_idx)
+			continue;
+		/* if this is not the initial namespace, dump only netdev */
+		if (net != &init_net && pnetelem->type != SMC_PNET_ETH)
+			continue;
+		if (smc_pnet_dumpinfo(skb, portid, seq, NLM_F_MULTI,
+				      pnetelem)) {
+			--idx;
+			break;
+		}
+	}
+	mutex_unlock(&pnettable->lock);
+	return idx;
+}
+
+static int smc_pnet_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct net *net = sock_net(skb->sk);
+	int idx;
+
+	idx = _smc_pnet_dump(net, skb, NETLINK_CB(cb->skb).portid,
+			     cb->nlh->nlmsg_seq, NULL, cb->args[0]);
+
+	cb->args[0] = idx;
+	return skb->len;
+}
+
+/* Retrieve one PNETID entry */
+static int smc_pnet_get(struct sk_buff *skb, struct genl_info *info)
+{
+	struct net *net = genl_info_net(info);
+	struct sk_buff *msg;
+	void *hdr;
+
+	if (!info->attrs[SMC_PNETID_NAME])
+		return -EINVAL;
+
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	_smc_pnet_dump(net, msg, info->snd_portid, info->snd_seq,
+		       nla_data(info->attrs[SMC_PNETID_NAME]), 0);
+
+	/* finish multi part message and send it */
+	hdr = nlmsg_put(msg, info->snd_portid, info->snd_seq, NLMSG_DONE, 0,
+			NLM_F_MULTI);
+	if (!hdr) {
+		nlmsg_free(msg);
+		return -EMSGSIZE;
+	}
+	return genlmsg_reply(msg, info);
+}
+
+/* Remove and delete all pnetids from pnet table.
+ */
+static int smc_pnet_flush(struct sk_buff *skb, struct genl_info *info)
+{
+	struct net *net = genl_info_net(info);
+
+	smc_pnet_remove_by_pnetid(net, NULL);
+	return 0;
+}
+
+/* SMC_PNETID generic netlink operation definition */
+static const struct genl_ops smc_pnet_ops[] = {
+	{
+		.cmd = SMC_PNETID_GET,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		/* can be retrieved by unprivileged users */
+		.doit = smc_pnet_get,
+		.dumpit = smc_pnet_dump,
+		.start = smc_pnet_dump_start
+	},
+	{
+		.cmd = SMC_PNETID_ADD,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.flags = GENL_ADMIN_PERM,
+		.doit = smc_pnet_add
+	},
+	{
+		.cmd = SMC_PNETID_DEL,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.flags = GENL_ADMIN_PERM,
+		.doit = smc_pnet_del
+	},
+	{
+		.cmd = SMC_PNETID_FLUSH,
+		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.flags = GENL_ADMIN_PERM,
+		.doit = smc_pnet_flush
+	}
+};
+
+/* SMC_PNETID family definition */
+static struct genl_family smc_pnet_nl_family __ro_after_init = {
+	.hdrsize = 0,
+	.name = SMCR_GENL_FAMILY_NAME,
+	.version = SMCR_GENL_FAMILY_VERSION,
+	.maxattr = SMC_PNETID_MAX,
+	.policy = smc_pnet_policy,
+	.netnsok = true,
+	.module = THIS_MODULE,
+	.ops = smc_pnet_ops,
+	.n_ops =  ARRAY_SIZE(smc_pnet_ops)
+};
+
+bool smc_pnet_is_ndev_pnetid(struct net *net, u8 *pnetid)
+{
+	struct smc_net *sn = net_generic(net, smc_net_id);
+	struct smc_pnetids_ndev_entry *pe;
+	bool rc = false;
+
+	read_lock(&sn->pnetids_ndev.lock);
+	list_for_each_entry(pe, &sn->pnetids_ndev.list, list) {
+		if (smc_pnet_match(pnetid, pe->pnetid)) {
+			rc = true;
+			goto unlock;
+		}
+	}
+
+unlock:
+	read_unlock(&sn->pnetids_ndev.lock);
+	return rc;
+}
+
+static int smc_pnet_add_pnetid(struct net *net, u8 *pnetid)
+{
+	struct smc_net *sn = net_generic(net, smc_net_id);
+	struct smc_pnetids_ndev_entry *pe, *pi;
+
+	pe = kzalloc(sizeof(*pe), GFP_KERNEL);
+	if (!pe)
+		return -ENOMEM;
+
+	write_lock(&sn->pnetids_ndev.lock);
+	list_for_each_entry(pi, &sn->pnetids_ndev.list, list) {
+		if (smc_pnet_match(pnetid, pe->pnetid)) {
+			refcount_inc(&pi->refcnt);
+			kfree(pe);
+			goto unlock;
+		}
+	}
+	refcount_set(&pe->refcnt, 1);
+	memcpy(pe->pnetid, pnetid, SMC_MAX_PNETID_LEN);
+	list_add_tail(&pe->list, &sn->pnetids_ndev.list);
+
+unlock:
+	write_unlock(&sn->pnetids_ndev.lock);
+	return 0;
+}
+
+static void smc_pnet_remove_pnetid(struct net *net, u8 *pnetid)
+{
+	struct smc_net *sn = net_generic(net, smc_net_id);
+	struct smc_pnetids_ndev_entry *pe, *pe2;
+
+	write_lock(&sn->pnetids_ndev.lock);
+	list_for_each_entry_safe(pe, pe2, &sn->pnetids_ndev.list, list) {
+		if (smc_pnet_match(pnetid, pe->pnetid)) {
+			if (refcount_dec_and_test(&pe->refcnt)) {
+				list_del(&pe->list);
+				kfree(pe);
+			}
+			break;
+		}
+	}
+	write_unlock(&sn->pnetids_ndev.lock);
+}
+
+static void smc_pnet_add_base_pnetid(struct net *net, struct net_device *dev,
+				     u8 *ndev_pnetid)
+{
+	struct net_device *base_dev;
+
+	base_dev = __pnet_find_base_ndev(dev);
+	if (base_dev->flags & IFF_UP &&
+	    !smc_pnetid_by_dev_port(base_dev->dev.parent, base_dev->dev_port,
+				    ndev_pnetid)) {
+		/* add to PNETIDs list */
+		smc_pnet_add_pnetid(net, ndev_pnetid);
+	}
+}
+
+/* create initial list of netdevice pnetids */
+static void smc_pnet_create_pnetids_list(struct net *net)
+{
+	u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
+	struct net_device *dev;
+
+	rtnl_lock();
+	for_each_netdev(net, dev)
+		smc_pnet_add_base_pnetid(net, dev, ndev_pnetid);
+	rtnl_unlock();
+}
+
+/* clean up list of netdevice pnetids */
+static void smc_pnet_destroy_pnetids_list(struct net *net)
+{
+	struct smc_net *sn = net_generic(net, smc_net_id);
+	struct smc_pnetids_ndev_entry *pe, *temp_pe;
+
+	write_lock(&sn->pnetids_ndev.lock);
+	list_for_each_entry_safe(pe, temp_pe, &sn->pnetids_ndev.list, list) {
+		list_del(&pe->list);
+		kfree(pe);
+	}
+	write_unlock(&sn->pnetids_ndev.lock);
+}
+
+static int smc_pnet_netdev_event(struct notifier_block *this,
+				 unsigned long event, void *ptr)
+{
+	struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
+	struct net *net = dev_net(event_dev);
+	u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
+
+	switch (event) {
+	case NETDEV_REBOOT:
+	case NETDEV_UNREGISTER:
+		smc_pnet_remove_by_ndev(event_dev);
+		return NOTIFY_OK;
+	case NETDEV_REGISTER:
+		smc_pnet_add_by_ndev(event_dev);
+		return NOTIFY_OK;
+	case NETDEV_UP:
+		smc_pnet_add_base_pnetid(net, event_dev, ndev_pnetid);
+		return NOTIFY_OK;
+	case NETDEV_DOWN:
+		event_dev = __pnet_find_base_ndev(event_dev);
+		if (!smc_pnetid_by_dev_port(event_dev->dev.parent,
+					    event_dev->dev_port, ndev_pnetid)) {
+			/* remove from PNETIDs list */
+			smc_pnet_remove_pnetid(net, ndev_pnetid);
+		}
+		return NOTIFY_OK;
+	default:
+		return NOTIFY_DONE;
+	}
+}
+
+static struct notifier_block smc_netdev_notifier = {
+	.notifier_call = smc_pnet_netdev_event
+};
+
+/* init network namespace */
+int smc_pnet_net_init(struct net *net)
+{
+	struct smc_net *sn = net_generic(net, smc_net_id);
+	struct smc_pnettable *pnettable = &sn->pnettable;
+	struct smc_pnetids_ndev *pnetids_ndev = &sn->pnetids_ndev;
+
+	INIT_LIST_HEAD(&pnettable->pnetlist);
+	mutex_init(&pnettable->lock);
+	INIT_LIST_HEAD(&pnetids_ndev->list);
+	rwlock_init(&pnetids_ndev->lock);
+
+	smc_pnet_create_pnetids_list(net);
+
+	return 0;
+}
+
+int __init smc_pnet_init(void)
+{
+	int rc;
+
+	rc = genl_register_family(&smc_pnet_nl_family);
+	if (rc)
+		return rc;
+	rc = register_netdevice_notifier(&smc_netdev_notifier);
+	if (rc)
+		genl_unregister_family(&smc_pnet_nl_family);
+
+	return rc;
+}
+
+/* exit network namespace */
+void smc_pnet_net_exit(struct net *net)
+{
+	/* flush pnet table */
+	smc_pnet_remove_by_pnetid(net, NULL);
+	smc_pnet_destroy_pnetids_list(net);
+}
+
+void smc_pnet_exit(void)
+{
+	unregister_netdevice_notifier(&smc_netdev_notifier);
+	genl_unregister_family(&smc_pnet_nl_family);
+}
+
+static struct net_device *__pnet_find_base_ndev(struct net_device *ndev)
+{
+	int i, nest_lvl;
+
+	ASSERT_RTNL();
+	nest_lvl = ndev->lower_level;
+	for (i = 0; i < nest_lvl; i++) {
+		struct list_head *lower = &ndev->adj_list.lower;
+
+		if (list_empty(lower))
+			break;
+		lower = lower->next;
+		ndev = netdev_lower_get_next(ndev, &lower);
+	}
+	return ndev;
+}
+
+/* Determine one base device for stacked net devices.
+ * If the lower device level contains more than one devices
+ * (for instance with bonding slaves), just the first device
+ * is used to reach a base device.
+ */
+static struct net_device *pnet_find_base_ndev(struct net_device *ndev)
+{
+	rtnl_lock();
+	ndev = __pnet_find_base_ndev(ndev);
+	rtnl_unlock();
+	return ndev;
+}
+
+static int smc_pnet_find_ndev_pnetid_by_table(struct net_device *ndev,
+					      u8 *pnetid)
+{
+	struct smc_pnettable *pnettable;
+	struct net *net = dev_net(ndev);
+	struct smc_pnetentry *pnetelem;
+	struct smc_net *sn;
+	int rc = -ENOENT;
+
+	/* get pnettable for namespace */
+	sn = net_generic(net, smc_net_id);
+	pnettable = &sn->pnettable;
+
+	mutex_lock(&pnettable->lock);
+	list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
+		if (pnetelem->type == SMC_PNET_ETH && ndev == pnetelem->ndev) {
+			/* get pnetid of netdev device */
+			memcpy(pnetid, pnetelem->pnet_name, SMC_MAX_PNETID_LEN);
+			rc = 0;
+			break;
+		}
+	}
+	mutex_unlock(&pnettable->lock);
+	return rc;
+}
+
+/* find a roce device for the given pnetid */
+static void _smc_pnet_find_roce_by_pnetid(u8 *pnet_id,
+					  struct smc_init_info *ini,
+					  struct smc_ib_device *known_dev)
+{
+	struct smc_ib_device *ibdev;
+	int i;
+
+	ini->ib_dev = NULL;
+	mutex_lock(&smc_ib_devices.mutex);
+	list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
+		if (ibdev == known_dev)
+			continue;
+		for (i = 1; i <= SMC_MAX_PORTS; i++) {
+			if (!rdma_is_port_valid(ibdev->ibdev, i))
+				continue;
+			if (smc_pnet_match(ibdev->pnetid[i - 1], pnet_id) &&
+			    smc_ib_port_active(ibdev, i) &&
+			    !test_bit(i - 1, ibdev->ports_going_away) &&
+			    !smc_ib_determine_gid(ibdev, i, ini->vlan_id,
+						  ini->ib_gid, NULL)) {
+				ini->ib_dev = ibdev;
+				ini->ib_port = i;
+				goto out;
+			}
+		}
+	}
+out:
+	mutex_unlock(&smc_ib_devices.mutex);
+}
+
+/* find alternate roce device with same pnet_id and vlan_id */
+void smc_pnet_find_alt_roce(struct smc_link_group *lgr,
+			    struct smc_init_info *ini,
+			    struct smc_ib_device *known_dev)
+{
+	_smc_pnet_find_roce_by_pnetid(lgr->pnet_id, ini, known_dev);
+}
+
+/* if handshake network device belongs to a roce device, return its
+ * IB device and port
+ */
+static void smc_pnet_find_rdma_dev(struct net_device *netdev,
+				   struct smc_init_info *ini)
+{
+	struct smc_ib_device *ibdev;
+
+	mutex_lock(&smc_ib_devices.mutex);
+	list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
+		struct net_device *ndev;
+		int i;
+
+		for (i = 1; i <= SMC_MAX_PORTS; i++) {
+			if (!rdma_is_port_valid(ibdev->ibdev, i))
+				continue;
+			if (!ibdev->ibdev->ops.get_netdev)
+				continue;
+			ndev = ibdev->ibdev->ops.get_netdev(ibdev->ibdev, i);
+			if (!ndev)
+				continue;
+			dev_put(ndev);
+			if (netdev == ndev &&
+			    smc_ib_port_active(ibdev, i) &&
+			    !test_bit(i - 1, ibdev->ports_going_away) &&
+			    !smc_ib_determine_gid(ibdev, i, ini->vlan_id,
+						  ini->ib_gid, NULL)) {
+				ini->ib_dev = ibdev;
+				ini->ib_port = i;
+				break;
+			}
+		}
+	}
+	mutex_unlock(&smc_ib_devices.mutex);
+}
+
+/* Determine the corresponding IB device port based on the hardware PNETID.
+ * Searching stops at the first matching active IB device port with vlan_id
+ * configured.
+ * If nothing found, check pnetid table.
+ * If nothing found, try to use handshake device
+ */
+static void smc_pnet_find_roce_by_pnetid(struct net_device *ndev,
+					 struct smc_init_info *ini)
+{
+	u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
+
+	ndev = pnet_find_base_ndev(ndev);
+	if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
+				   ndev_pnetid) &&
+	    smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid)) {
+		smc_pnet_find_rdma_dev(ndev, ini);
+		return; /* pnetid could not be determined */
+	}
+	_smc_pnet_find_roce_by_pnetid(ndev_pnetid, ini, NULL);
+}
+
+static void smc_pnet_find_ism_by_pnetid(struct net_device *ndev,
+					struct smc_init_info *ini)
+{
+	u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
+	struct smcd_dev *ismdev;
+
+	ndev = pnet_find_base_ndev(ndev);
+	if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
+				   ndev_pnetid) &&
+	    smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid))
+		return; /* pnetid could not be determined */
+
+	mutex_lock(&smcd_dev_list.mutex);
+	list_for_each_entry(ismdev, &smcd_dev_list.list, list) {
+		if (smc_pnet_match(ismdev->pnetid, ndev_pnetid) &&
+		    !ismdev->going_away &&
+		    (!ini->ism_peer_gid[0] ||
+		     !smc_ism_cantalk(ini->ism_peer_gid[0], ini->vlan_id,
+				      ismdev))) {
+			ini->ism_dev[0] = ismdev;
+			break;
+		}
+	}
+	mutex_unlock(&smcd_dev_list.mutex);
+}
+
+/* PNET table analysis for a given sock:
+ * determine ib_device and port belonging to used internal TCP socket
+ * ethernet interface.
+ */
+void smc_pnet_find_roce_resource(struct sock *sk, struct smc_init_info *ini)
+{
+	struct dst_entry *dst = sk_dst_get(sk);
+
+	ini->ib_dev = NULL;
+	ini->ib_port = 0;
+	if (!dst)
+		goto out;
+	if (!dst->dev)
+		goto out_rel;
+
+	smc_pnet_find_roce_by_pnetid(dst->dev, ini);
+
+out_rel:
+	dst_release(dst);
+out:
+	return;
+}
+
+void smc_pnet_find_ism_resource(struct sock *sk, struct smc_init_info *ini)
+{
+	struct dst_entry *dst = sk_dst_get(sk);
+
+	ini->ism_dev[0] = NULL;
+	if (!dst)
+		goto out;
+	if (!dst->dev)
+		goto out_rel;
+
+	smc_pnet_find_ism_by_pnetid(dst->dev, ini);
+
+out_rel:
+	dst_release(dst);
+out:
+	return;
+}
+
+/* Lookup and apply a pnet table entry to the given ib device.
+ */
+int smc_pnetid_by_table_ib(struct smc_ib_device *smcibdev, u8 ib_port)
+{
+	char *ib_name = smcibdev->ibdev->name;
+	struct smc_pnettable *pnettable;
+	struct smc_pnetentry *tmp_pe;
+	struct smc_net *sn;
+	int rc = -ENOENT;
+
+	/* get pnettable for init namespace */
+	sn = net_generic(&init_net, smc_net_id);
+	pnettable = &sn->pnettable;
+
+	mutex_lock(&pnettable->lock);
+	list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) {
+		if (tmp_pe->type == SMC_PNET_IB &&
+		    !strncmp(tmp_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX) &&
+		    tmp_pe->ib_port == ib_port) {
+			smc_pnet_apply_ib(smcibdev, ib_port, tmp_pe->pnet_name);
+			rc = 0;
+			break;
+		}
+	}
+	mutex_unlock(&pnettable->lock);
+
+	return rc;
+}
+
+/* Lookup and apply a pnet table entry to the given smcd device.
+ */
+int smc_pnetid_by_table_smcd(struct smcd_dev *smcddev)
+{
+	const char *ib_name = dev_name(&smcddev->dev);
+	struct smc_pnettable *pnettable;
+	struct smc_pnetentry *tmp_pe;
+	struct smc_net *sn;
+	int rc = -ENOENT;
+
+	/* get pnettable for init namespace */
+	sn = net_generic(&init_net, smc_net_id);
+	pnettable = &sn->pnettable;
+
+	mutex_lock(&pnettable->lock);
+	list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) {
+		if (tmp_pe->type == SMC_PNET_IB &&
+		    !strncmp(tmp_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX)) {
+			smc_pnet_apply_smcd(smcddev, tmp_pe->pnet_name);
+			rc = 0;
+			break;
+		}
+	}
+	mutex_unlock(&pnettable->lock);
+
+	return rc;
+}