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-rw-r--r--net/smc/smc_pnet.c1206
1 files changed, 1206 insertions, 0 deletions
diff --git a/net/smc/smc_pnet.c b/net/smc/smc_pnet.c
new file mode 100644
index 000000000..25fb2fd18
--- /dev/null
+++ b/net/smc/smc_pnet.c
@@ -0,0 +1,1206 @@
+// 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 != &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)) {
+ netdev_hold(ndev, &pnetelem->dev_tracker, GFP_ATOMIC);
+ 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) {
+ netdev_put(pnetelem->ndev, &pnetelem->dev_tracker);
+ 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);
+ 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) {
+ if (ndev) {
+ new_pe->ndev = ndev;
+ netdev_tracker_alloc(ndev, &new_pe->dev_tracker,
+ GFP_ATOMIC);
+ }
+ 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:
+ 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),
+ .resv_start_op = SMC_PNETID_FLUSH + 1,
+};
+
+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);
+ smc_ib_ndev_change(event_dev, event);
+ return NOTIFY_OK;
+ case NETDEV_REGISTER:
+ smc_pnet_add_by_ndev(event_dev);
+ smc_ib_ndev_change(event_dev, event);
+ 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);
+
+ /* disable handshake limitation by default */
+ net->smc.limit_smc_hs = 0;
+
+ 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;
+}
+
+static int smc_pnet_determine_gid(struct smc_ib_device *ibdev, int i,
+ struct smc_init_info *ini)
+{
+ if (!ini->check_smcrv2 &&
+ !smc_ib_determine_gid(ibdev, i, ini->vlan_id, ini->ib_gid, NULL,
+ NULL)) {
+ ini->ib_dev = ibdev;
+ ini->ib_port = i;
+ return 0;
+ }
+ if (ini->check_smcrv2 &&
+ !smc_ib_determine_gid(ibdev, i, ini->vlan_id, ini->smcrv2.ib_gid_v2,
+ NULL, &ini->smcrv2)) {
+ ini->smcrv2.ib_dev_v2 = ibdev;
+ ini->smcrv2.ib_port_v2 = i;
+ return 0;
+ }
+ return -ENODEV;
+}
+
+/* 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 net *net)
+{
+ struct smc_ib_device *ibdev;
+ int i;
+
+ mutex_lock(&smc_ib_devices.mutex);
+ list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
+ if (ibdev == known_dev ||
+ !rdma_dev_access_netns(ibdev->ibdev, net))
+ 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)) {
+ if (!smc_pnet_determine_gid(ibdev, i, ini))
+ goto out;
+ }
+ }
+ }
+out:
+ mutex_unlock(&smc_ib_devices.mutex);
+}
+
+/* find alternate roce device with same pnet_id, vlan_id and net namespace */
+void smc_pnet_find_alt_roce(struct smc_link_group *lgr,
+ struct smc_init_info *ini,
+ struct smc_ib_device *known_dev)
+{
+ struct net *net = lgr->net;
+
+ _smc_pnet_find_roce_by_pnetid(lgr->pnet_id, ini, known_dev, net);
+}
+
+/* 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 net *net = dev_net(netdev);
+ 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;
+
+ /* check rdma net namespace */
+ if (!rdma_dev_access_netns(ibdev->ibdev, net))
+ continue;
+
+ 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)) {
+ if (!smc_pnet_determine_gid(ibdev, i, ini))
+ 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];
+ struct net *net;
+
+ ndev = pnet_find_base_ndev(ndev);
+ net = dev_net(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, net);
+}
+
+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);
+
+ 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;
+}