diff options
Diffstat (limited to 'drivers/infiniband/ulp/ipoib/ipoib_main.c')
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_main.c | 2686 |
1 files changed, 2686 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c new file mode 100644 index 000000000..35322d23f --- /dev/null +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -0,0 +1,2686 @@ +/* + * Copyright (c) 2004 Topspin Communications. All rights reserved. + * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. + * Copyright (c) 2004 Voltaire, Inc. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include "ipoib.h" + +#include <linux/module.h> + +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/kernel.h> +#include <linux/vmalloc.h> + +#include <linux/if_arp.h> /* For ARPHRD_xxx */ + +#include <linux/ip.h> +#include <linux/in.h> + +#include <linux/jhash.h> +#include <net/arp.h> +#include <net/addrconf.h> +#include <linux/inetdevice.h> +#include <rdma/ib_cache.h> + +MODULE_AUTHOR("Roland Dreier"); +MODULE_DESCRIPTION("IP-over-InfiniBand net driver"); +MODULE_LICENSE("Dual BSD/GPL"); + +int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE; +int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE; + +module_param_named(send_queue_size, ipoib_sendq_size, int, 0444); +MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue"); +module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444); +MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue"); + +#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG +int ipoib_debug_level; + +module_param_named(debug_level, ipoib_debug_level, int, 0644); +MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0"); +#endif + +struct ipoib_path_iter { + struct net_device *dev; + struct ipoib_path path; +}; + +static const u8 ipv4_bcast_addr[] = { + 0x00, 0xff, 0xff, 0xff, + 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff +}; + +struct workqueue_struct *ipoib_workqueue; + +struct ib_sa_client ipoib_sa_client; + +static int ipoib_add_one(struct ib_device *device); +static void ipoib_remove_one(struct ib_device *device, void *client_data); +static void ipoib_neigh_reclaim(struct rcu_head *rp); +static struct net_device *ipoib_get_net_dev_by_params( + struct ib_device *dev, u8 port, u16 pkey, + const union ib_gid *gid, const struct sockaddr *addr, + void *client_data); +static int ipoib_set_mac(struct net_device *dev, void *addr); +static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr, + int cmd); + +static struct ib_client ipoib_client = { + .name = "ipoib", + .add = ipoib_add_one, + .remove = ipoib_remove_one, + .get_net_dev_by_params = ipoib_get_net_dev_by_params, +}; + +#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG +static int ipoib_netdev_event(struct notifier_block *this, + unsigned long event, void *ptr) +{ + struct netdev_notifier_info *ni = ptr; + struct net_device *dev = ni->dev; + + if (dev->netdev_ops->ndo_open != ipoib_open) + return NOTIFY_DONE; + + switch (event) { + case NETDEV_REGISTER: + ipoib_create_debug_files(dev); + break; + case NETDEV_CHANGENAME: + ipoib_delete_debug_files(dev); + ipoib_create_debug_files(dev); + break; + case NETDEV_UNREGISTER: + ipoib_delete_debug_files(dev); + break; + } + + return NOTIFY_DONE; +} +#endif + +int ipoib_open(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + ipoib_dbg(priv, "bringing up interface\n"); + + netif_carrier_off(dev); + + set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); + + priv->sm_fullmember_sendonly_support = false; + + if (ipoib_ib_dev_open(dev)) { + if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) + return 0; + goto err_disable; + } + + ipoib_ib_dev_up(dev); + + if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { + struct ipoib_dev_priv *cpriv; + + /* Bring up any child interfaces too */ + down_read(&priv->vlan_rwsem); + list_for_each_entry(cpriv, &priv->child_intfs, list) { + int flags; + + flags = cpriv->dev->flags; + if (flags & IFF_UP) + continue; + + dev_change_flags(cpriv->dev, flags | IFF_UP, NULL); + } + up_read(&priv->vlan_rwsem); + } + + netif_start_queue(dev); + + return 0; + +err_disable: + clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); + + return -EINVAL; +} + +static int ipoib_stop(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + ipoib_dbg(priv, "stopping interface\n"); + + clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); + + netif_stop_queue(dev); + + ipoib_ib_dev_down(dev); + ipoib_ib_dev_stop(dev); + + if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { + struct ipoib_dev_priv *cpriv; + + /* Bring down any child interfaces too */ + down_read(&priv->vlan_rwsem); + list_for_each_entry(cpriv, &priv->child_intfs, list) { + int flags; + + flags = cpriv->dev->flags; + if (!(flags & IFF_UP)) + continue; + + dev_change_flags(cpriv->dev, flags & ~IFF_UP, NULL); + } + up_read(&priv->vlan_rwsem); + } + + return 0; +} + +static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) + features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO); + + return features; +} + +static int ipoib_change_mtu(struct net_device *dev, int new_mtu) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + int ret = 0; + + /* dev->mtu > 2K ==> connected mode */ + if (ipoib_cm_admin_enabled(dev)) { + if (new_mtu > ipoib_cm_max_mtu(dev)) + return -EINVAL; + + if (new_mtu > priv->mcast_mtu) + ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n", + priv->mcast_mtu); + + dev->mtu = new_mtu; + return 0; + } + + if (new_mtu < (ETH_MIN_MTU + IPOIB_ENCAP_LEN) || + new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu)) + return -EINVAL; + + priv->admin_mtu = new_mtu; + + if (priv->mcast_mtu < priv->admin_mtu) + ipoib_dbg(priv, "MTU must be smaller than the underlying " + "link layer MTU - 4 (%u)\n", priv->mcast_mtu); + + new_mtu = min(priv->mcast_mtu, priv->admin_mtu); + + if (priv->rn_ops->ndo_change_mtu) { + bool carrier_status = netif_carrier_ok(dev); + + netif_carrier_off(dev); + + /* notify lower level on the real mtu */ + ret = priv->rn_ops->ndo_change_mtu(dev, new_mtu); + + if (carrier_status) + netif_carrier_on(dev); + } else { + dev->mtu = new_mtu; + } + + return ret; +} + +static void ipoib_get_stats(struct net_device *dev, + struct rtnl_link_stats64 *stats) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + if (priv->rn_ops->ndo_get_stats64) + priv->rn_ops->ndo_get_stats64(dev, stats); + else + netdev_stats_to_stats64(stats, &dev->stats); +} + +/* Called with an RCU read lock taken */ +static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr, + struct net_device *dev) +{ + struct net *net = dev_net(dev); + struct in_device *in_dev; + struct sockaddr_in *addr_in = (struct sockaddr_in *)addr; + struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr; + __be32 ret_addr; + + switch (addr->sa_family) { + case AF_INET: + in_dev = in_dev_get(dev); + if (!in_dev) + return false; + + ret_addr = inet_confirm_addr(net, in_dev, 0, + addr_in->sin_addr.s_addr, + RT_SCOPE_HOST); + in_dev_put(in_dev); + if (ret_addr) + return true; + + break; + case AF_INET6: + if (IS_ENABLED(CONFIG_IPV6) && + ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1)) + return true; + + break; + } + return false; +} + +/** + * Find the master net_device on top of the given net_device. + * @dev: base IPoIB net_device + * + * Returns the master net_device with a reference held, or the same net_device + * if no master exists. + */ +static struct net_device *ipoib_get_master_net_dev(struct net_device *dev) +{ + struct net_device *master; + + rcu_read_lock(); + master = netdev_master_upper_dev_get_rcu(dev); + if (master) + dev_hold(master); + rcu_read_unlock(); + + if (master) + return master; + + dev_hold(dev); + return dev; +} + +struct ipoib_walk_data { + const struct sockaddr *addr; + struct net_device *result; +}; + +static int ipoib_upper_walk(struct net_device *upper, + struct netdev_nested_priv *priv) +{ + struct ipoib_walk_data *data = (struct ipoib_walk_data *)priv->data; + int ret = 0; + + if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) { + dev_hold(upper); + data->result = upper; + ret = 1; + } + + return ret; +} + +/** + * Find a net_device matching the given address, which is an upper device of + * the given net_device. + * @addr: IP address to look for. + * @dev: base IPoIB net_device + * + * If found, returns the net_device with a reference held. Otherwise return + * NULL. + */ +static struct net_device *ipoib_get_net_dev_match_addr( + const struct sockaddr *addr, struct net_device *dev) +{ + struct netdev_nested_priv priv; + struct ipoib_walk_data data = { + .addr = addr, + }; + + priv.data = (void *)&data; + rcu_read_lock(); + if (ipoib_is_dev_match_addr_rcu(addr, dev)) { + dev_hold(dev); + data.result = dev; + goto out; + } + + netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &priv); +out: + rcu_read_unlock(); + return data.result; +} + +/* returns the number of IPoIB netdevs on top a given ipoib device matching a + * pkey_index and address, if one exists. + * + * @found_net_dev: contains a matching net_device if the return value >= 1, + * with a reference held. */ +static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv, + const union ib_gid *gid, + u16 pkey_index, + const struct sockaddr *addr, + int nesting, + struct net_device **found_net_dev) +{ + struct ipoib_dev_priv *child_priv; + struct net_device *net_dev = NULL; + int matches = 0; + + if (priv->pkey_index == pkey_index && + (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) { + if (!addr) { + net_dev = ipoib_get_master_net_dev(priv->dev); + } else { + /* Verify the net_device matches the IP address, as + * IPoIB child devices currently share a GID. */ + net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev); + } + if (net_dev) { + if (!*found_net_dev) + *found_net_dev = net_dev; + else + dev_put(net_dev); + ++matches; + } + } + + /* Check child interfaces */ + down_read_nested(&priv->vlan_rwsem, nesting); + list_for_each_entry(child_priv, &priv->child_intfs, list) { + matches += ipoib_match_gid_pkey_addr(child_priv, gid, + pkey_index, addr, + nesting + 1, + found_net_dev); + if (matches > 1) + break; + } + up_read(&priv->vlan_rwsem); + + return matches; +} + +/* Returns the number of matching net_devs found (between 0 and 2). Also + * return the matching net_device in the @net_dev parameter, holding a + * reference to the net_device, if the number of matches >= 1 */ +static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port, + u16 pkey_index, + const union ib_gid *gid, + const struct sockaddr *addr, + struct net_device **net_dev) +{ + struct ipoib_dev_priv *priv; + int matches = 0; + + *net_dev = NULL; + + list_for_each_entry(priv, dev_list, list) { + if (priv->port != port) + continue; + + matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index, + addr, 0, net_dev); + if (matches > 1) + break; + } + + return matches; +} + +static struct net_device *ipoib_get_net_dev_by_params( + struct ib_device *dev, u8 port, u16 pkey, + const union ib_gid *gid, const struct sockaddr *addr, + void *client_data) +{ + struct net_device *net_dev; + struct list_head *dev_list = client_data; + u16 pkey_index; + int matches; + int ret; + + if (!rdma_protocol_ib(dev, port)) + return NULL; + + ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index); + if (ret) + return NULL; + + /* See if we can find a unique device matching the L2 parameters */ + matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index, + gid, NULL, &net_dev); + + switch (matches) { + case 0: + return NULL; + case 1: + return net_dev; + } + + dev_put(net_dev); + + /* Couldn't find a unique device with L2 parameters only. Use L3 + * address to uniquely match the net device */ + matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index, + gid, addr, &net_dev); + switch (matches) { + case 0: + return NULL; + default: + dev_warn_ratelimited(&dev->dev, + "duplicate IP address detected\n"); + fallthrough; + case 1: + return net_dev; + } +} + +int ipoib_set_mode(struct net_device *dev, const char *buf) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + if ((test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) && + !strcmp(buf, "connected\n")) || + (!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) && + !strcmp(buf, "datagram\n"))) { + return 0; + } + + /* flush paths if we switch modes so that connections are restarted */ + if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) { + set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); + ipoib_warn(priv, "enabling connected mode " + "will cause multicast packet drops\n"); + netdev_update_features(dev); + dev_set_mtu(dev, ipoib_cm_max_mtu(dev)); + netif_set_real_num_tx_queues(dev, 1); + rtnl_unlock(); + priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM; + + ipoib_flush_paths(dev); + return (!rtnl_trylock()) ? -EBUSY : 0; + } + + if (!strcmp(buf, "datagram\n")) { + clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); + netdev_update_features(dev); + dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu)); + netif_set_real_num_tx_queues(dev, dev->num_tx_queues); + rtnl_unlock(); + ipoib_flush_paths(dev); + return (!rtnl_trylock()) ? -EBUSY : 0; + } + + return -EINVAL; +} + +struct ipoib_path *__path_find(struct net_device *dev, void *gid) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct rb_node *n = priv->path_tree.rb_node; + struct ipoib_path *path; + int ret; + + while (n) { + path = rb_entry(n, struct ipoib_path, rb_node); + + ret = memcmp(gid, path->pathrec.dgid.raw, + sizeof (union ib_gid)); + + if (ret < 0) + n = n->rb_left; + else if (ret > 0) + n = n->rb_right; + else + return path; + } + + return NULL; +} + +static int __path_add(struct net_device *dev, struct ipoib_path *path) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct rb_node **n = &priv->path_tree.rb_node; + struct rb_node *pn = NULL; + struct ipoib_path *tpath; + int ret; + + while (*n) { + pn = *n; + tpath = rb_entry(pn, struct ipoib_path, rb_node); + + ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw, + sizeof (union ib_gid)); + if (ret < 0) + n = &pn->rb_left; + else if (ret > 0) + n = &pn->rb_right; + else + return -EEXIST; + } + + rb_link_node(&path->rb_node, pn, n); + rb_insert_color(&path->rb_node, &priv->path_tree); + + list_add_tail(&path->list, &priv->path_list); + + return 0; +} + +static void path_free(struct net_device *dev, struct ipoib_path *path) +{ + struct sk_buff *skb; + + while ((skb = __skb_dequeue(&path->queue))) + dev_kfree_skb_irq(skb); + + ipoib_dbg(ipoib_priv(dev), "%s\n", __func__); + + /* remove all neigh connected to this path */ + ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw); + + if (path->ah) + ipoib_put_ah(path->ah); + + kfree(path); +} + +#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG + +struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev) +{ + struct ipoib_path_iter *iter; + + iter = kmalloc(sizeof(*iter), GFP_KERNEL); + if (!iter) + return NULL; + + iter->dev = dev; + memset(iter->path.pathrec.dgid.raw, 0, 16); + + if (ipoib_path_iter_next(iter)) { + kfree(iter); + return NULL; + } + + return iter; +} + +int ipoib_path_iter_next(struct ipoib_path_iter *iter) +{ + struct ipoib_dev_priv *priv = ipoib_priv(iter->dev); + struct rb_node *n; + struct ipoib_path *path; + int ret = 1; + + spin_lock_irq(&priv->lock); + + n = rb_first(&priv->path_tree); + + while (n) { + path = rb_entry(n, struct ipoib_path, rb_node); + + if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw, + sizeof (union ib_gid)) < 0) { + iter->path = *path; + ret = 0; + break; + } + + n = rb_next(n); + } + + spin_unlock_irq(&priv->lock); + + return ret; +} + +void ipoib_path_iter_read(struct ipoib_path_iter *iter, + struct ipoib_path *path) +{ + *path = iter->path; +} + +#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */ + +void ipoib_mark_paths_invalid(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct ipoib_path *path, *tp; + + spin_lock_irq(&priv->lock); + + list_for_each_entry_safe(path, tp, &priv->path_list, list) { + ipoib_dbg(priv, "mark path LID 0x%08x GID %pI6 invalid\n", + be32_to_cpu(sa_path_get_dlid(&path->pathrec)), + path->pathrec.dgid.raw); + if (path->ah) + path->ah->valid = 0; + } + + spin_unlock_irq(&priv->lock); +} + +static void push_pseudo_header(struct sk_buff *skb, const char *daddr) +{ + struct ipoib_pseudo_header *phdr; + + phdr = skb_push(skb, sizeof(*phdr)); + memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN); +} + +void ipoib_flush_paths(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct ipoib_path *path, *tp; + LIST_HEAD(remove_list); + unsigned long flags; + + netif_tx_lock_bh(dev); + spin_lock_irqsave(&priv->lock, flags); + + list_splice_init(&priv->path_list, &remove_list); + + list_for_each_entry(path, &remove_list, list) + rb_erase(&path->rb_node, &priv->path_tree); + + list_for_each_entry_safe(path, tp, &remove_list, list) { + if (path->query) + ib_sa_cancel_query(path->query_id, path->query); + spin_unlock_irqrestore(&priv->lock, flags); + netif_tx_unlock_bh(dev); + wait_for_completion(&path->done); + path_free(dev, path); + netif_tx_lock_bh(dev); + spin_lock_irqsave(&priv->lock, flags); + } + + spin_unlock_irqrestore(&priv->lock, flags); + netif_tx_unlock_bh(dev); +} + +static void path_rec_completion(int status, + struct sa_path_rec *pathrec, + void *path_ptr) +{ + struct ipoib_path *path = path_ptr; + struct net_device *dev = path->dev; + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct ipoib_ah *ah = NULL; + struct ipoib_ah *old_ah = NULL; + struct ipoib_neigh *neigh, *tn; + struct sk_buff_head skqueue; + struct sk_buff *skb; + unsigned long flags; + + if (!status) + ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n", + be32_to_cpu(sa_path_get_dlid(pathrec)), + pathrec->dgid.raw); + else + ipoib_dbg(priv, "PathRec status %d for GID %pI6\n", + status, path->pathrec.dgid.raw); + + skb_queue_head_init(&skqueue); + + if (!status) { + struct rdma_ah_attr av; + + if (!ib_init_ah_attr_from_path(priv->ca, priv->port, + pathrec, &av, NULL)) { + ah = ipoib_create_ah(dev, priv->pd, &av); + rdma_destroy_ah_attr(&av); + } + } + + spin_lock_irqsave(&priv->lock, flags); + + if (!IS_ERR_OR_NULL(ah)) { + /* + * pathrec.dgid is used as the database key from the LLADDR, + * it must remain unchanged even if the SA returns a different + * GID to use in the AH. + */ + if (memcmp(pathrec->dgid.raw, path->pathrec.dgid.raw, + sizeof(union ib_gid))) { + ipoib_dbg( + priv, + "%s got PathRec for gid %pI6 while asked for %pI6\n", + dev->name, pathrec->dgid.raw, + path->pathrec.dgid.raw); + memcpy(pathrec->dgid.raw, path->pathrec.dgid.raw, + sizeof(union ib_gid)); + } + + path->pathrec = *pathrec; + + old_ah = path->ah; + path->ah = ah; + + ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n", + ah, be32_to_cpu(sa_path_get_dlid(pathrec)), + pathrec->sl); + + while ((skb = __skb_dequeue(&path->queue))) + __skb_queue_tail(&skqueue, skb); + + list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) { + if (neigh->ah) { + WARN_ON(neigh->ah != old_ah); + /* + * Dropping the ah reference inside + * priv->lock is safe here, because we + * will hold one more reference from + * the original value of path->ah (ie + * old_ah). + */ + ipoib_put_ah(neigh->ah); + } + kref_get(&path->ah->ref); + neigh->ah = path->ah; + + if (ipoib_cm_enabled(dev, neigh->daddr)) { + if (!ipoib_cm_get(neigh)) + ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, + path, + neigh)); + if (!ipoib_cm_get(neigh)) { + ipoib_neigh_free(neigh); + continue; + } + } + + while ((skb = __skb_dequeue(&neigh->queue))) + __skb_queue_tail(&skqueue, skb); + } + path->ah->valid = 1; + } + + path->query = NULL; + complete(&path->done); + + spin_unlock_irqrestore(&priv->lock, flags); + + if (IS_ERR_OR_NULL(ah)) + ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw); + + if (old_ah) + ipoib_put_ah(old_ah); + + while ((skb = __skb_dequeue(&skqueue))) { + int ret; + skb->dev = dev; + ret = dev_queue_xmit(skb); + if (ret) + ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n", + __func__, ret); + } +} + +static void init_path_rec(struct ipoib_dev_priv *priv, struct ipoib_path *path, + void *gid) +{ + path->dev = priv->dev; + + if (rdma_cap_opa_ah(priv->ca, priv->port)) + path->pathrec.rec_type = SA_PATH_REC_TYPE_OPA; + else + path->pathrec.rec_type = SA_PATH_REC_TYPE_IB; + + memcpy(path->pathrec.dgid.raw, gid, sizeof(union ib_gid)); + path->pathrec.sgid = priv->local_gid; + path->pathrec.pkey = cpu_to_be16(priv->pkey); + path->pathrec.numb_path = 1; + path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class; +} + +static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct ipoib_path *path; + + if (!priv->broadcast) + return NULL; + + path = kzalloc(sizeof(*path), GFP_ATOMIC); + if (!path) + return NULL; + + skb_queue_head_init(&path->queue); + + INIT_LIST_HEAD(&path->neigh_list); + + init_path_rec(priv, path, gid); + + return path; +} + +static int path_rec_start(struct net_device *dev, + struct ipoib_path *path) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + ipoib_dbg(priv, "Start path record lookup for %pI6\n", + path->pathrec.dgid.raw); + + init_completion(&path->done); + + path->query_id = + ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port, + &path->pathrec, + IB_SA_PATH_REC_DGID | + IB_SA_PATH_REC_SGID | + IB_SA_PATH_REC_NUMB_PATH | + IB_SA_PATH_REC_TRAFFIC_CLASS | + IB_SA_PATH_REC_PKEY, + 1000, GFP_ATOMIC, + path_rec_completion, + path, &path->query); + if (path->query_id < 0) { + ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id); + path->query = NULL; + complete(&path->done); + return path->query_id; + } + + return 0; +} + +static void neigh_refresh_path(struct ipoib_neigh *neigh, u8 *daddr, + struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct ipoib_path *path; + unsigned long flags; + + spin_lock_irqsave(&priv->lock, flags); + + path = __path_find(dev, daddr + 4); + if (!path) + goto out; + if (!path->query) + path_rec_start(dev, path); +out: + spin_unlock_irqrestore(&priv->lock, flags); +} + +static struct ipoib_neigh *neigh_add_path(struct sk_buff *skb, u8 *daddr, + struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct rdma_netdev *rn = netdev_priv(dev); + struct ipoib_path *path; + struct ipoib_neigh *neigh; + unsigned long flags; + + spin_lock_irqsave(&priv->lock, flags); + neigh = ipoib_neigh_alloc(daddr, dev); + if (!neigh) { + spin_unlock_irqrestore(&priv->lock, flags); + ++dev->stats.tx_dropped; + dev_kfree_skb_any(skb); + return NULL; + } + + /* To avoid race condition, make sure that the + * neigh will be added only once. + */ + if (unlikely(!list_empty(&neigh->list))) { + spin_unlock_irqrestore(&priv->lock, flags); + return neigh; + } + + path = __path_find(dev, daddr + 4); + if (!path) { + path = path_rec_create(dev, daddr + 4); + if (!path) + goto err_path; + + __path_add(dev, path); + } + + list_add_tail(&neigh->list, &path->neigh_list); + + if (path->ah && path->ah->valid) { + kref_get(&path->ah->ref); + neigh->ah = path->ah; + + if (ipoib_cm_enabled(dev, neigh->daddr)) { + if (!ipoib_cm_get(neigh)) + ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh)); + if (!ipoib_cm_get(neigh)) { + ipoib_neigh_free(neigh); + goto err_drop; + } + if (skb_queue_len(&neigh->queue) < + IPOIB_MAX_PATH_REC_QUEUE) { + push_pseudo_header(skb, neigh->daddr); + __skb_queue_tail(&neigh->queue, skb); + } else { + ipoib_warn(priv, "queue length limit %d. Packet drop.\n", + skb_queue_len(&neigh->queue)); + goto err_drop; + } + } else { + spin_unlock_irqrestore(&priv->lock, flags); + path->ah->last_send = rn->send(dev, skb, path->ah->ah, + IPOIB_QPN(daddr)); + ipoib_neigh_put(neigh); + return NULL; + } + } else { + neigh->ah = NULL; + + if (!path->query && path_rec_start(dev, path)) + goto err_path; + if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) { + push_pseudo_header(skb, neigh->daddr); + __skb_queue_tail(&neigh->queue, skb); + } else { + goto err_drop; + } + } + + spin_unlock_irqrestore(&priv->lock, flags); + ipoib_neigh_put(neigh); + return NULL; + +err_path: + ipoib_neigh_free(neigh); +err_drop: + ++dev->stats.tx_dropped; + dev_kfree_skb_any(skb); + + spin_unlock_irqrestore(&priv->lock, flags); + ipoib_neigh_put(neigh); + + return NULL; +} + +static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev, + struct ipoib_pseudo_header *phdr) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct rdma_netdev *rn = netdev_priv(dev); + struct ipoib_path *path; + unsigned long flags; + + spin_lock_irqsave(&priv->lock, flags); + + /* no broadcast means that all paths are (going to be) not valid */ + if (!priv->broadcast) + goto drop_and_unlock; + + path = __path_find(dev, phdr->hwaddr + 4); + if (!path || !path->ah || !path->ah->valid) { + if (!path) { + path = path_rec_create(dev, phdr->hwaddr + 4); + if (!path) + goto drop_and_unlock; + __path_add(dev, path); + } else { + /* + * make sure there are no changes in the existing + * path record + */ + init_path_rec(priv, path, phdr->hwaddr + 4); + } + if (!path->query && path_rec_start(dev, path)) { + goto drop_and_unlock; + } + + if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) { + push_pseudo_header(skb, phdr->hwaddr); + __skb_queue_tail(&path->queue, skb); + goto unlock; + } else { + goto drop_and_unlock; + } + } + + spin_unlock_irqrestore(&priv->lock, flags); + ipoib_dbg(priv, "Send unicast ARP to %08x\n", + be32_to_cpu(sa_path_get_dlid(&path->pathrec))); + path->ah->last_send = rn->send(dev, skb, path->ah->ah, + IPOIB_QPN(phdr->hwaddr)); + return; + +drop_and_unlock: + ++dev->stats.tx_dropped; + dev_kfree_skb_any(skb); +unlock: + spin_unlock_irqrestore(&priv->lock, flags); +} + +static netdev_tx_t ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct rdma_netdev *rn = netdev_priv(dev); + struct ipoib_neigh *neigh; + struct ipoib_pseudo_header *phdr; + struct ipoib_header *header; + unsigned long flags; + + phdr = (struct ipoib_pseudo_header *) skb->data; + skb_pull(skb, sizeof(*phdr)); + header = (struct ipoib_header *) skb->data; + + if (unlikely(phdr->hwaddr[4] == 0xff)) { + /* multicast, arrange "if" according to probability */ + if ((header->proto != htons(ETH_P_IP)) && + (header->proto != htons(ETH_P_IPV6)) && + (header->proto != htons(ETH_P_ARP)) && + (header->proto != htons(ETH_P_RARP)) && + (header->proto != htons(ETH_P_TIPC))) { + /* ethertype not supported by IPoIB */ + ++dev->stats.tx_dropped; + dev_kfree_skb_any(skb); + return NETDEV_TX_OK; + } + /* Add in the P_Key for multicast*/ + phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff; + phdr->hwaddr[9] = priv->pkey & 0xff; + + neigh = ipoib_neigh_get(dev, phdr->hwaddr); + if (likely(neigh)) + goto send_using_neigh; + ipoib_mcast_send(dev, phdr->hwaddr, skb); + return NETDEV_TX_OK; + } + + /* unicast, arrange "switch" according to probability */ + switch (header->proto) { + case htons(ETH_P_IP): + case htons(ETH_P_IPV6): + case htons(ETH_P_TIPC): + neigh = ipoib_neigh_get(dev, phdr->hwaddr); + if (unlikely(!neigh)) { + neigh = neigh_add_path(skb, phdr->hwaddr, dev); + if (likely(!neigh)) + return NETDEV_TX_OK; + } + break; + case htons(ETH_P_ARP): + case htons(ETH_P_RARP): + /* for unicast ARP and RARP should always perform path find */ + unicast_arp_send(skb, dev, phdr); + return NETDEV_TX_OK; + default: + /* ethertype not supported by IPoIB */ + ++dev->stats.tx_dropped; + dev_kfree_skb_any(skb); + return NETDEV_TX_OK; + } + +send_using_neigh: + /* note we now hold a ref to neigh */ + if (ipoib_cm_get(neigh)) { + if (ipoib_cm_up(neigh)) { + ipoib_cm_send(dev, skb, ipoib_cm_get(neigh)); + goto unref; + } + } else if (neigh->ah && neigh->ah->valid) { + neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah, + IPOIB_QPN(phdr->hwaddr)); + goto unref; + } else if (neigh->ah) { + neigh_refresh_path(neigh, phdr->hwaddr, dev); + } + + if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) { + push_pseudo_header(skb, phdr->hwaddr); + spin_lock_irqsave(&priv->lock, flags); + __skb_queue_tail(&neigh->queue, skb); + spin_unlock_irqrestore(&priv->lock, flags); + } else { + ++dev->stats.tx_dropped; + dev_kfree_skb_any(skb); + } + +unref: + ipoib_neigh_put(neigh); + + return NETDEV_TX_OK; +} + +static void ipoib_timeout(struct net_device *dev, unsigned int txqueue) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + ipoib_warn(priv, "transmit timeout: latency %d msecs\n", + jiffies_to_msecs(jiffies - dev_trans_start(dev))); + ipoib_warn(priv, + "queue stopped %d, tx_head %u, tx_tail %u, global_tx_head %u, global_tx_tail %u\n", + netif_queue_stopped(dev), priv->tx_head, priv->tx_tail, + priv->global_tx_head, priv->global_tx_tail); + + /* XXX reset QP, etc. */ +} + +static int ipoib_hard_header(struct sk_buff *skb, + struct net_device *dev, + unsigned short type, + const void *daddr, + const void *saddr, + unsigned int len) +{ + struct ipoib_header *header; + + header = skb_push(skb, sizeof(*header)); + + header->proto = htons(type); + header->reserved = 0; + + /* + * we don't rely on dst_entry structure, always stuff the + * destination address into skb hard header so we can figure out where + * to send the packet later. + */ + push_pseudo_header(skb, daddr); + + return IPOIB_HARD_LEN; +} + +static void ipoib_set_mcast_list(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { + ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set"); + return; + } + + queue_work(priv->wq, &priv->restart_task); +} + +static int ipoib_get_iflink(const struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + /* parent interface */ + if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) + return dev->ifindex; + + /* child/vlan interface */ + return priv->parent->ifindex; +} + +static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr) +{ + /* + * Use only the address parts that contributes to spreading + * The subnet prefix is not used as one can not connect to + * same remote port (GUID) using the same remote QPN via two + * different subnets. + */ + /* qpn octets[1:4) & port GUID octets[12:20) */ + u32 *d32 = (u32 *) daddr; + u32 hv; + + hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0); + return hv & htbl->mask; +} + +struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct ipoib_neigh_table *ntbl = &priv->ntbl; + struct ipoib_neigh_hash *htbl; + struct ipoib_neigh *neigh = NULL; + u32 hash_val; + + rcu_read_lock_bh(); + + htbl = rcu_dereference_bh(ntbl->htbl); + + if (!htbl) + goto out_unlock; + + hash_val = ipoib_addr_hash(htbl, daddr); + for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]); + neigh != NULL; + neigh = rcu_dereference_bh(neigh->hnext)) { + if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) { + /* found, take one ref on behalf of the caller */ + if (!atomic_inc_not_zero(&neigh->refcnt)) { + /* deleted */ + neigh = NULL; + goto out_unlock; + } + + if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)) + neigh->alive = jiffies; + goto out_unlock; + } + } + +out_unlock: + rcu_read_unlock_bh(); + return neigh; +} + +static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv) +{ + struct ipoib_neigh_table *ntbl = &priv->ntbl; + struct ipoib_neigh_hash *htbl; + unsigned long neigh_obsolete; + unsigned long dt; + unsigned long flags; + int i; + LIST_HEAD(remove_list); + + spin_lock_irqsave(&priv->lock, flags); + + htbl = rcu_dereference_protected(ntbl->htbl, + lockdep_is_held(&priv->lock)); + + if (!htbl) + goto out_unlock; + + /* neigh is obsolete if it was idle for two GC periods */ + dt = 2 * arp_tbl.gc_interval; + neigh_obsolete = jiffies - dt; + + for (i = 0; i < htbl->size; i++) { + struct ipoib_neigh *neigh; + struct ipoib_neigh __rcu **np = &htbl->buckets[i]; + + while ((neigh = rcu_dereference_protected(*np, + lockdep_is_held(&priv->lock))) != NULL) { + /* was the neigh idle for two GC periods */ + if (time_after(neigh_obsolete, neigh->alive)) { + + ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list); + + rcu_assign_pointer(*np, + rcu_dereference_protected(neigh->hnext, + lockdep_is_held(&priv->lock))); + /* remove from path/mc list */ + list_del_init(&neigh->list); + call_rcu(&neigh->rcu, ipoib_neigh_reclaim); + } else { + np = &neigh->hnext; + } + + } + } + +out_unlock: + spin_unlock_irqrestore(&priv->lock, flags); + ipoib_mcast_remove_list(&remove_list); +} + +static void ipoib_reap_neigh(struct work_struct *work) +{ + struct ipoib_dev_priv *priv = + container_of(work, struct ipoib_dev_priv, neigh_reap_task.work); + + __ipoib_reap_neigh(priv); + + queue_delayed_work(priv->wq, &priv->neigh_reap_task, + arp_tbl.gc_interval); +} + + +static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr, + struct net_device *dev) +{ + struct ipoib_neigh *neigh; + + neigh = kzalloc(sizeof(*neigh), GFP_ATOMIC); + if (!neigh) + return NULL; + + neigh->dev = dev; + memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr)); + skb_queue_head_init(&neigh->queue); + INIT_LIST_HEAD(&neigh->list); + ipoib_cm_set(neigh, NULL); + /* one ref on behalf of the caller */ + atomic_set(&neigh->refcnt, 1); + + return neigh; +} + +struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr, + struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct ipoib_neigh_table *ntbl = &priv->ntbl; + struct ipoib_neigh_hash *htbl; + struct ipoib_neigh *neigh; + u32 hash_val; + + htbl = rcu_dereference_protected(ntbl->htbl, + lockdep_is_held(&priv->lock)); + if (!htbl) { + neigh = NULL; + goto out_unlock; + } + + /* need to add a new neigh, but maybe some other thread succeeded? + * recalc hash, maybe hash resize took place so we do a search + */ + hash_val = ipoib_addr_hash(htbl, daddr); + for (neigh = rcu_dereference_protected(htbl->buckets[hash_val], + lockdep_is_held(&priv->lock)); + neigh != NULL; + neigh = rcu_dereference_protected(neigh->hnext, + lockdep_is_held(&priv->lock))) { + if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) { + /* found, take one ref on behalf of the caller */ + if (!atomic_inc_not_zero(&neigh->refcnt)) { + /* deleted */ + neigh = NULL; + break; + } + neigh->alive = jiffies; + goto out_unlock; + } + } + + neigh = ipoib_neigh_ctor(daddr, dev); + if (!neigh) + goto out_unlock; + + /* one ref on behalf of the hash table */ + atomic_inc(&neigh->refcnt); + neigh->alive = jiffies; + /* put in hash */ + rcu_assign_pointer(neigh->hnext, + rcu_dereference_protected(htbl->buckets[hash_val], + lockdep_is_held(&priv->lock))); + rcu_assign_pointer(htbl->buckets[hash_val], neigh); + atomic_inc(&ntbl->entries); + +out_unlock: + + return neigh; +} + +void ipoib_neigh_dtor(struct ipoib_neigh *neigh) +{ + /* neigh reference count was dropprd to zero */ + struct net_device *dev = neigh->dev; + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct sk_buff *skb; + if (neigh->ah) + ipoib_put_ah(neigh->ah); + while ((skb = __skb_dequeue(&neigh->queue))) { + ++dev->stats.tx_dropped; + dev_kfree_skb_any(skb); + } + if (ipoib_cm_get(neigh)) + ipoib_cm_destroy_tx(ipoib_cm_get(neigh)); + ipoib_dbg(ipoib_priv(dev), + "neigh free for %06x %pI6\n", + IPOIB_QPN(neigh->daddr), + neigh->daddr + 4); + kfree(neigh); + if (atomic_dec_and_test(&priv->ntbl.entries)) { + if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags)) + complete(&priv->ntbl.flushed); + } +} + +static void ipoib_neigh_reclaim(struct rcu_head *rp) +{ + /* Called as a result of removal from hash table */ + struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu); + /* note TX context may hold another ref */ + ipoib_neigh_put(neigh); +} + +void ipoib_neigh_free(struct ipoib_neigh *neigh) +{ + struct net_device *dev = neigh->dev; + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct ipoib_neigh_table *ntbl = &priv->ntbl; + struct ipoib_neigh_hash *htbl; + struct ipoib_neigh __rcu **np; + struct ipoib_neigh *n; + u32 hash_val; + + htbl = rcu_dereference_protected(ntbl->htbl, + lockdep_is_held(&priv->lock)); + if (!htbl) + return; + + hash_val = ipoib_addr_hash(htbl, neigh->daddr); + np = &htbl->buckets[hash_val]; + for (n = rcu_dereference_protected(*np, + lockdep_is_held(&priv->lock)); + n != NULL; + n = rcu_dereference_protected(*np, + lockdep_is_held(&priv->lock))) { + if (n == neigh) { + /* found */ + rcu_assign_pointer(*np, + rcu_dereference_protected(neigh->hnext, + lockdep_is_held(&priv->lock))); + /* remove from parent list */ + list_del_init(&neigh->list); + call_rcu(&neigh->rcu, ipoib_neigh_reclaim); + return; + } else { + np = &n->hnext; + } + } +} + +static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv) +{ + struct ipoib_neigh_table *ntbl = &priv->ntbl; + struct ipoib_neigh_hash *htbl; + struct ipoib_neigh __rcu **buckets; + u32 size; + + clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags); + ntbl->htbl = NULL; + htbl = kzalloc(sizeof(*htbl), GFP_KERNEL); + if (!htbl) + return -ENOMEM; + size = roundup_pow_of_two(arp_tbl.gc_thresh3); + buckets = kvcalloc(size, sizeof(*buckets), GFP_KERNEL); + if (!buckets) { + kfree(htbl); + return -ENOMEM; + } + htbl->size = size; + htbl->mask = (size - 1); + htbl->buckets = buckets; + RCU_INIT_POINTER(ntbl->htbl, htbl); + htbl->ntbl = ntbl; + atomic_set(&ntbl->entries, 0); + + /* start garbage collection */ + queue_delayed_work(priv->wq, &priv->neigh_reap_task, + arp_tbl.gc_interval); + + return 0; +} + +static void neigh_hash_free_rcu(struct rcu_head *head) +{ + struct ipoib_neigh_hash *htbl = container_of(head, + struct ipoib_neigh_hash, + rcu); + struct ipoib_neigh __rcu **buckets = htbl->buckets; + struct ipoib_neigh_table *ntbl = htbl->ntbl; + + kvfree(buckets); + kfree(htbl); + complete(&ntbl->deleted); +} + +void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct ipoib_neigh_table *ntbl = &priv->ntbl; + struct ipoib_neigh_hash *htbl; + unsigned long flags; + int i; + + /* remove all neigh connected to a given path or mcast */ + spin_lock_irqsave(&priv->lock, flags); + + htbl = rcu_dereference_protected(ntbl->htbl, + lockdep_is_held(&priv->lock)); + + if (!htbl) + goto out_unlock; + + for (i = 0; i < htbl->size; i++) { + struct ipoib_neigh *neigh; + struct ipoib_neigh __rcu **np = &htbl->buckets[i]; + + while ((neigh = rcu_dereference_protected(*np, + lockdep_is_held(&priv->lock))) != NULL) { + /* delete neighs belong to this parent */ + if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) { + rcu_assign_pointer(*np, + rcu_dereference_protected(neigh->hnext, + lockdep_is_held(&priv->lock))); + /* remove from parent list */ + list_del_init(&neigh->list); + call_rcu(&neigh->rcu, ipoib_neigh_reclaim); + } else { + np = &neigh->hnext; + } + + } + } +out_unlock: + spin_unlock_irqrestore(&priv->lock, flags); +} + +static void ipoib_flush_neighs(struct ipoib_dev_priv *priv) +{ + struct ipoib_neigh_table *ntbl = &priv->ntbl; + struct ipoib_neigh_hash *htbl; + unsigned long flags; + int i, wait_flushed = 0; + + init_completion(&priv->ntbl.flushed); + set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags); + + spin_lock_irqsave(&priv->lock, flags); + + htbl = rcu_dereference_protected(ntbl->htbl, + lockdep_is_held(&priv->lock)); + if (!htbl) + goto out_unlock; + + wait_flushed = atomic_read(&priv->ntbl.entries); + if (!wait_flushed) + goto free_htbl; + + for (i = 0; i < htbl->size; i++) { + struct ipoib_neigh *neigh; + struct ipoib_neigh __rcu **np = &htbl->buckets[i]; + + while ((neigh = rcu_dereference_protected(*np, + lockdep_is_held(&priv->lock))) != NULL) { + rcu_assign_pointer(*np, + rcu_dereference_protected(neigh->hnext, + lockdep_is_held(&priv->lock))); + /* remove from path/mc list */ + list_del_init(&neigh->list); + call_rcu(&neigh->rcu, ipoib_neigh_reclaim); + } + } + +free_htbl: + rcu_assign_pointer(ntbl->htbl, NULL); + call_rcu(&htbl->rcu, neigh_hash_free_rcu); + +out_unlock: + spin_unlock_irqrestore(&priv->lock, flags); + if (wait_flushed) + wait_for_completion(&priv->ntbl.flushed); +} + +static void ipoib_neigh_hash_uninit(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + ipoib_dbg(priv, "%s\n", __func__); + init_completion(&priv->ntbl.deleted); + + cancel_delayed_work_sync(&priv->neigh_reap_task); + + ipoib_flush_neighs(priv); + + wait_for_completion(&priv->ntbl.deleted); +} + +static void ipoib_napi_add(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + netif_napi_add(dev, &priv->recv_napi, ipoib_rx_poll, IPOIB_NUM_WC); + netif_napi_add(dev, &priv->send_napi, ipoib_tx_poll, MAX_SEND_CQE); +} + +static void ipoib_napi_del(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + netif_napi_del(&priv->recv_napi); + netif_napi_del(&priv->send_napi); +} + +static void ipoib_dev_uninit_default(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + ipoib_transport_dev_cleanup(dev); + + ipoib_napi_del(dev); + + ipoib_cm_dev_cleanup(dev); + + kfree(priv->rx_ring); + vfree(priv->tx_ring); + + priv->rx_ring = NULL; + priv->tx_ring = NULL; +} + +static int ipoib_dev_init_default(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + ipoib_napi_add(dev); + + /* Allocate RX/TX "rings" to hold queued skbs */ + priv->rx_ring = kcalloc(ipoib_recvq_size, + sizeof(*priv->rx_ring), + GFP_KERNEL); + if (!priv->rx_ring) + goto out; + + priv->tx_ring = vzalloc(array_size(ipoib_sendq_size, + sizeof(*priv->tx_ring))); + if (!priv->tx_ring) { + pr_warn("%s: failed to allocate TX ring (%d entries)\n", + priv->ca->name, ipoib_sendq_size); + goto out_rx_ring_cleanup; + } + + /* priv->tx_head, tx_tail and global_tx_tail/head are already 0 */ + + if (ipoib_transport_dev_init(dev, priv->ca)) { + pr_warn("%s: ipoib_transport_dev_init failed\n", + priv->ca->name); + goto out_tx_ring_cleanup; + } + + /* after qp created set dev address */ + priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff; + priv->dev->dev_addr[2] = (priv->qp->qp_num >> 8) & 0xff; + priv->dev->dev_addr[3] = (priv->qp->qp_num) & 0xff; + + return 0; + +out_tx_ring_cleanup: + vfree(priv->tx_ring); + +out_rx_ring_cleanup: + kfree(priv->rx_ring); + +out: + ipoib_napi_del(dev); + return -ENOMEM; +} + +static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr, + int cmd) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + if (!priv->rn_ops->ndo_do_ioctl) + return -EOPNOTSUPP; + + return priv->rn_ops->ndo_do_ioctl(dev, ifr, cmd); +} + +static int ipoib_dev_init(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + int ret = -ENOMEM; + + priv->qp = NULL; + + /* + * the various IPoIB tasks assume they will never race against + * themselves, so always use a single thread workqueue + */ + priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM); + if (!priv->wq) { + pr_warn("%s: failed to allocate device WQ\n", dev->name); + goto out; + } + + /* create pd, which used both for control and datapath*/ + priv->pd = ib_alloc_pd(priv->ca, 0); + if (IS_ERR(priv->pd)) { + pr_warn("%s: failed to allocate PD\n", priv->ca->name); + goto clean_wq; + } + + ret = priv->rn_ops->ndo_init(dev); + if (ret) { + pr_warn("%s failed to init HW resource\n", dev->name); + goto out_free_pd; + } + + ret = ipoib_neigh_hash_init(priv); + if (ret) { + pr_warn("%s failed to init neigh hash\n", dev->name); + goto out_dev_uninit; + } + + if (dev->flags & IFF_UP) { + if (ipoib_ib_dev_open(dev)) { + pr_warn("%s failed to open device\n", dev->name); + ret = -ENODEV; + goto out_hash_uninit; + } + } + + return 0; + +out_hash_uninit: + ipoib_neigh_hash_uninit(dev); + +out_dev_uninit: + ipoib_ib_dev_cleanup(dev); + +out_free_pd: + if (priv->pd) { + ib_dealloc_pd(priv->pd); + priv->pd = NULL; + } + +clean_wq: + if (priv->wq) { + destroy_workqueue(priv->wq); + priv->wq = NULL; + } + +out: + return ret; +} + +/* + * This must be called before doing an unregister_netdev on a parent device to + * shutdown the IB event handler. + */ +static void ipoib_parent_unregister_pre(struct net_device *ndev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(ndev); + + /* + * ipoib_set_mac checks netif_running before pushing work, clearing + * running ensures the it will not add more work. + */ + rtnl_lock(); + dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP, NULL); + rtnl_unlock(); + + /* ipoib_event() cannot be running once this returns */ + ib_unregister_event_handler(&priv->event_handler); + + /* + * Work on the queue grabs the rtnl lock, so this cannot be done while + * also holding it. + */ + flush_workqueue(ipoib_workqueue); +} + +static void ipoib_set_dev_features(struct ipoib_dev_priv *priv) +{ + priv->hca_caps = priv->ca->attrs.device_cap_flags; + + if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) { + priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM; + + if (priv->hca_caps & IB_DEVICE_UD_TSO) + priv->dev->hw_features |= NETIF_F_TSO; + + priv->dev->features |= priv->dev->hw_features; + } +} + +static int ipoib_parent_init(struct net_device *ndev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(ndev); + struct ib_port_attr attr; + int result; + + result = ib_query_port(priv->ca, priv->port, &attr); + if (result) { + pr_warn("%s: ib_query_port %d failed\n", priv->ca->name, + priv->port); + return result; + } + priv->max_ib_mtu = rdma_mtu_from_attr(priv->ca, priv->port, &attr); + + result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey); + if (result) { + pr_warn("%s: ib_query_pkey port %d failed (ret = %d)\n", + priv->ca->name, priv->port, result); + return result; + } + + result = rdma_query_gid(priv->ca, priv->port, 0, &priv->local_gid); + if (result) { + pr_warn("%s: rdma_query_gid port %d failed (ret = %d)\n", + priv->ca->name, priv->port, result); + return result; + } + memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, + sizeof(union ib_gid)); + + SET_NETDEV_DEV(priv->dev, priv->ca->dev.parent); + priv->dev->dev_port = priv->port - 1; + /* Let's set this one too for backwards compatibility. */ + priv->dev->dev_id = priv->port - 1; + + return 0; +} + +static void ipoib_child_init(struct net_device *ndev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(ndev); + struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent); + + priv->max_ib_mtu = ppriv->max_ib_mtu; + set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags); + if (memchr_inv(priv->dev->dev_addr, 0, INFINIBAND_ALEN)) + memcpy(&priv->local_gid, priv->dev->dev_addr + 4, + sizeof(priv->local_gid)); + else { + memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, + INFINIBAND_ALEN); + memcpy(&priv->local_gid, &ppriv->local_gid, + sizeof(priv->local_gid)); + } +} + +static int ipoib_ndo_init(struct net_device *ndev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(ndev); + int rc; + struct rdma_netdev *rn = netdev_priv(ndev); + + if (priv->parent) { + ipoib_child_init(ndev); + } else { + rc = ipoib_parent_init(ndev); + if (rc) + return rc; + } + + /* MTU will be reset when mcast join happens */ + ndev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu); + priv->mcast_mtu = priv->admin_mtu = ndev->mtu; + rn->mtu = priv->mcast_mtu; + ndev->max_mtu = IPOIB_CM_MTU; + + ndev->neigh_priv_len = sizeof(struct ipoib_neigh); + + /* + * Set the full membership bit, so that we join the right + * broadcast group, etc. + */ + priv->pkey |= 0x8000; + + ndev->broadcast[8] = priv->pkey >> 8; + ndev->broadcast[9] = priv->pkey & 0xff; + set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags); + + ipoib_set_dev_features(priv); + + rc = ipoib_dev_init(ndev); + if (rc) { + pr_warn("%s: failed to initialize device: %s port %d (ret = %d)\n", + priv->ca->name, priv->dev->name, priv->port, rc); + return rc; + } + + if (priv->parent) { + struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent); + + dev_hold(priv->parent); + + down_write(&ppriv->vlan_rwsem); + list_add_tail(&priv->list, &ppriv->child_intfs); + up_write(&ppriv->vlan_rwsem); + } + + return 0; +} + +static void ipoib_ndo_uninit(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + ASSERT_RTNL(); + + /* + * ipoib_remove_one guarantees the children are removed before the + * parent, and that is the only place where a parent can be removed. + */ + WARN_ON(!list_empty(&priv->child_intfs)); + + if (priv->parent) { + struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent); + + down_write(&ppriv->vlan_rwsem); + list_del(&priv->list); + up_write(&ppriv->vlan_rwsem); + } + + ipoib_neigh_hash_uninit(dev); + + ipoib_ib_dev_cleanup(dev); + + /* no more works over the priv->wq */ + if (priv->wq) { + /* See ipoib_mcast_carrier_on_task() */ + WARN_ON(test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)); + flush_workqueue(priv->wq); + destroy_workqueue(priv->wq); + priv->wq = NULL; + } + + if (priv->parent) + dev_put(priv->parent); +} + +static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state); +} + +static int ipoib_get_vf_config(struct net_device *dev, int vf, + struct ifla_vf_info *ivf) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + int err; + + err = ib_get_vf_config(priv->ca, vf, priv->port, ivf); + if (err) + return err; + + ivf->vf = vf; + memcpy(ivf->mac, dev->dev_addr, dev->addr_len); + + return 0; +} + +static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID) + return -EINVAL; + + return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type); +} + +static int ipoib_get_vf_guid(struct net_device *dev, int vf, + struct ifla_vf_guid *node_guid, + struct ifla_vf_guid *port_guid) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + return ib_get_vf_guid(priv->ca, vf, priv->port, node_guid, port_guid); +} + +static int ipoib_get_vf_stats(struct net_device *dev, int vf, + struct ifla_vf_stats *vf_stats) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats); +} + +static const struct header_ops ipoib_header_ops = { + .create = ipoib_hard_header, +}; + +static const struct net_device_ops ipoib_netdev_ops_pf = { + .ndo_init = ipoib_ndo_init, + .ndo_uninit = ipoib_ndo_uninit, + .ndo_open = ipoib_open, + .ndo_stop = ipoib_stop, + .ndo_change_mtu = ipoib_change_mtu, + .ndo_fix_features = ipoib_fix_features, + .ndo_start_xmit = ipoib_start_xmit, + .ndo_tx_timeout = ipoib_timeout, + .ndo_set_rx_mode = ipoib_set_mcast_list, + .ndo_get_iflink = ipoib_get_iflink, + .ndo_set_vf_link_state = ipoib_set_vf_link_state, + .ndo_get_vf_config = ipoib_get_vf_config, + .ndo_get_vf_stats = ipoib_get_vf_stats, + .ndo_get_vf_guid = ipoib_get_vf_guid, + .ndo_set_vf_guid = ipoib_set_vf_guid, + .ndo_set_mac_address = ipoib_set_mac, + .ndo_get_stats64 = ipoib_get_stats, + .ndo_do_ioctl = ipoib_ioctl, +}; + +static const struct net_device_ops ipoib_netdev_ops_vf = { + .ndo_init = ipoib_ndo_init, + .ndo_uninit = ipoib_ndo_uninit, + .ndo_open = ipoib_open, + .ndo_stop = ipoib_stop, + .ndo_change_mtu = ipoib_change_mtu, + .ndo_fix_features = ipoib_fix_features, + .ndo_start_xmit = ipoib_start_xmit, + .ndo_tx_timeout = ipoib_timeout, + .ndo_set_rx_mode = ipoib_set_mcast_list, + .ndo_get_iflink = ipoib_get_iflink, + .ndo_get_stats64 = ipoib_get_stats, + .ndo_do_ioctl = ipoib_ioctl, +}; + +static const struct net_device_ops ipoib_netdev_default_pf = { + .ndo_init = ipoib_dev_init_default, + .ndo_uninit = ipoib_dev_uninit_default, + .ndo_open = ipoib_ib_dev_open_default, + .ndo_stop = ipoib_ib_dev_stop_default, +}; + +void ipoib_setup_common(struct net_device *dev) +{ + dev->header_ops = &ipoib_header_ops; + dev->netdev_ops = &ipoib_netdev_default_pf; + + ipoib_set_ethtool_ops(dev); + + dev->watchdog_timeo = HZ; + + dev->flags |= IFF_BROADCAST | IFF_MULTICAST; + + dev->hard_header_len = IPOIB_HARD_LEN; + dev->addr_len = INFINIBAND_ALEN; + dev->type = ARPHRD_INFINIBAND; + dev->tx_queue_len = ipoib_sendq_size * 2; + dev->features = (NETIF_F_VLAN_CHALLENGED | + NETIF_F_HIGHDMA); + netif_keep_dst(dev); + + memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN); + + /* + * unregister_netdev always frees the netdev, we use this mode + * consistently to unify all the various unregister paths, including + * those connected to rtnl_link_ops which require it. + */ + dev->needs_free_netdev = true; +} + +static void ipoib_build_priv(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + + priv->dev = dev; + spin_lock_init(&priv->lock); + init_rwsem(&priv->vlan_rwsem); + mutex_init(&priv->mcast_mutex); + + INIT_LIST_HEAD(&priv->path_list); + INIT_LIST_HEAD(&priv->child_intfs); + INIT_LIST_HEAD(&priv->dead_ahs); + INIT_LIST_HEAD(&priv->multicast_list); + + INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task); + INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task); + INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light); + INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal); + INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy); + INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task); + INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah); + INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh); +} + +static struct net_device *ipoib_alloc_netdev(struct ib_device *hca, u8 port, + const char *name) +{ + struct net_device *dev; + + dev = rdma_alloc_netdev(hca, port, RDMA_NETDEV_IPOIB, name, + NET_NAME_UNKNOWN, ipoib_setup_common); + if (!IS_ERR(dev) || PTR_ERR(dev) != -EOPNOTSUPP) + return dev; + + dev = alloc_netdev(sizeof(struct rdma_netdev), name, NET_NAME_UNKNOWN, + ipoib_setup_common); + if (!dev) + return ERR_PTR(-ENOMEM); + return dev; +} + +int ipoib_intf_init(struct ib_device *hca, u8 port, const char *name, + struct net_device *dev) +{ + struct rdma_netdev *rn = netdev_priv(dev); + struct ipoib_dev_priv *priv; + int rc; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->ca = hca; + priv->port = port; + + rc = rdma_init_netdev(hca, port, RDMA_NETDEV_IPOIB, name, + NET_NAME_UNKNOWN, ipoib_setup_common, dev); + if (rc) { + if (rc != -EOPNOTSUPP) + goto out; + + rn->send = ipoib_send; + rn->attach_mcast = ipoib_mcast_attach; + rn->detach_mcast = ipoib_mcast_detach; + rn->hca = hca; + + rc = netif_set_real_num_tx_queues(dev, 1); + if (rc) + goto out; + + rc = netif_set_real_num_rx_queues(dev, 1); + if (rc) + goto out; + } + + priv->rn_ops = dev->netdev_ops; + + if (hca->attrs.device_cap_flags & IB_DEVICE_VIRTUAL_FUNCTION) + dev->netdev_ops = &ipoib_netdev_ops_vf; + else + dev->netdev_ops = &ipoib_netdev_ops_pf; + + rn->clnt_priv = priv; + /* + * Only the child register_netdev flows can handle priv_destructor + * being set, so we force it to NULL here and handle manually until it + * is safe to turn on. + */ + priv->next_priv_destructor = dev->priv_destructor; + dev->priv_destructor = NULL; + + ipoib_build_priv(dev); + + return 0; + +out: + kfree(priv); + return rc; +} + +struct net_device *ipoib_intf_alloc(struct ib_device *hca, u8 port, + const char *name) +{ + struct net_device *dev; + int rc; + + dev = ipoib_alloc_netdev(hca, port, name); + if (IS_ERR(dev)) + return dev; + + rc = ipoib_intf_init(hca, port, name, dev); + if (rc) { + free_netdev(dev); + return ERR_PTR(rc); + } + + /* + * Upon success the caller must ensure ipoib_intf_free is called or + * register_netdevice succeed'd and priv_destructor is set to + * ipoib_intf_free. + */ + return dev; +} + +void ipoib_intf_free(struct net_device *dev) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct rdma_netdev *rn = netdev_priv(dev); + + dev->priv_destructor = priv->next_priv_destructor; + if (dev->priv_destructor) + dev->priv_destructor(dev); + + /* + * There are some error flows around register_netdev failing that may + * attempt to call priv_destructor twice, prevent that from happening. + */ + dev->priv_destructor = NULL; + + /* unregister/destroy is very complicated. Make bugs more obvious. */ + rn->clnt_priv = NULL; + + kfree(priv); +} + +static ssize_t show_pkey(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct net_device *ndev = to_net_dev(dev); + struct ipoib_dev_priv *priv = ipoib_priv(ndev); + + return sprintf(buf, "0x%04x\n", priv->pkey); +} +static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); + +static ssize_t show_umcast(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct net_device *ndev = to_net_dev(dev); + struct ipoib_dev_priv *priv = ipoib_priv(ndev); + + return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags)); +} + +void ipoib_set_umcast(struct net_device *ndev, int umcast_val) +{ + struct ipoib_dev_priv *priv = ipoib_priv(ndev); + + if (umcast_val > 0) { + set_bit(IPOIB_FLAG_UMCAST, &priv->flags); + ipoib_warn(priv, "ignoring multicast groups joined directly " + "by userspace\n"); + } else + clear_bit(IPOIB_FLAG_UMCAST, &priv->flags); +} + +static ssize_t set_umcast(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned long umcast_val = simple_strtoul(buf, NULL, 0); + + ipoib_set_umcast(to_net_dev(dev), umcast_val); + + return count; +} +static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast); + +int ipoib_add_umcast_attr(struct net_device *dev) +{ + return device_create_file(&dev->dev, &dev_attr_umcast); +} + +static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid) +{ + struct ipoib_dev_priv *child_priv; + struct net_device *netdev = priv->dev; + + netif_addr_lock_bh(netdev); + + memcpy(&priv->local_gid.global.interface_id, + &gid->global.interface_id, + sizeof(gid->global.interface_id)); + memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid)); + clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags); + + netif_addr_unlock_bh(netdev); + + if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { + down_read(&priv->vlan_rwsem); + list_for_each_entry(child_priv, &priv->child_intfs, list) + set_base_guid(child_priv, gid); + up_read(&priv->vlan_rwsem); + } +} + +static int ipoib_check_lladdr(struct net_device *dev, + struct sockaddr_storage *ss) +{ + union ib_gid *gid = (union ib_gid *)(ss->__data + 4); + int ret = 0; + + netif_addr_lock_bh(dev); + + /* Make sure the QPN, reserved and subnet prefix match the current + * lladdr, it also makes sure the lladdr is unicast. + */ + if (memcmp(dev->dev_addr, ss->__data, + 4 + sizeof(gid->global.subnet_prefix)) || + gid->global.interface_id == 0) + ret = -EINVAL; + + netif_addr_unlock_bh(dev); + + return ret; +} + +static int ipoib_set_mac(struct net_device *dev, void *addr) +{ + struct ipoib_dev_priv *priv = ipoib_priv(dev); + struct sockaddr_storage *ss = addr; + int ret; + + if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev)) + return -EBUSY; + + ret = ipoib_check_lladdr(dev, ss); + if (ret) + return ret; + + set_base_guid(priv, (union ib_gid *)(ss->__data + 4)); + + queue_work(ipoib_workqueue, &priv->flush_light); + + return 0; +} + +static ssize_t create_child(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int pkey; + int ret; + + if (sscanf(buf, "%i", &pkey) != 1) + return -EINVAL; + + if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000) + return -EINVAL; + + ret = ipoib_vlan_add(to_net_dev(dev), pkey); + + return ret ? ret : count; +} +static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child); + +static ssize_t delete_child(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int pkey; + int ret; + + if (sscanf(buf, "%i", &pkey) != 1) + return -EINVAL; + + if (pkey < 0 || pkey > 0xffff) + return -EINVAL; + + ret = ipoib_vlan_delete(to_net_dev(dev), pkey); + + return ret ? ret : count; + +} +static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child); + +int ipoib_add_pkey_attr(struct net_device *dev) +{ + return device_create_file(&dev->dev, &dev_attr_pkey); +} + +/* + * We erroneously exposed the iface's port number in the dev_id + * sysfs field long after dev_port was introduced for that purpose[1], + * and we need to stop everyone from relying on that. + * Let's overload the shower routine for the dev_id file here + * to gently bring the issue up. + * + * [1] https://www.spinics.net/lists/netdev/msg272123.html + */ +static ssize_t dev_id_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct net_device *ndev = to_net_dev(dev); + + /* + * ndev->dev_port will be equal to 0 in old kernel prior to commit + * 9b8b2a323008 ("IB/ipoib: Use dev_port to expose network interface + * port numbers") Zero was chosen as special case for user space + * applications to fallback and query dev_id to check if it has + * different value or not. + * + * Don't print warning in such scenario. + * + * https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c#L358 + */ + if (ndev->dev_port && ndev->dev_id == ndev->dev_port) + netdev_info_once(ndev, + "\"%s\" wants to know my dev_id. Should it look at dev_port instead? See Documentation/ABI/testing/sysfs-class-net for more info.\n", + current->comm); + + return sprintf(buf, "%#x\n", ndev->dev_id); +} +static DEVICE_ATTR_RO(dev_id); + +static int ipoib_intercept_dev_id_attr(struct net_device *dev) +{ + device_remove_file(&dev->dev, &dev_attr_dev_id); + return device_create_file(&dev->dev, &dev_attr_dev_id); +} + +static struct net_device *ipoib_add_port(const char *format, + struct ib_device *hca, u8 port) +{ + struct rtnl_link_ops *ops = ipoib_get_link_ops(); + struct rdma_netdev_alloc_params params; + struct ipoib_dev_priv *priv; + struct net_device *ndev; + int result; + + ndev = ipoib_intf_alloc(hca, port, format); + if (IS_ERR(ndev)) { + pr_warn("%s, %d: ipoib_intf_alloc failed %ld\n", hca->name, port, + PTR_ERR(ndev)); + return ndev; + } + priv = ipoib_priv(ndev); + + INIT_IB_EVENT_HANDLER(&priv->event_handler, + priv->ca, ipoib_event); + ib_register_event_handler(&priv->event_handler); + + /* call event handler to ensure pkey in sync */ + queue_work(ipoib_workqueue, &priv->flush_heavy); + + ndev->rtnl_link_ops = ipoib_get_link_ops(); + + result = register_netdev(ndev); + if (result) { + pr_warn("%s: couldn't register ipoib port %d; error %d\n", + hca->name, port, result); + + ipoib_parent_unregister_pre(ndev); + ipoib_intf_free(ndev); + free_netdev(ndev); + + return ERR_PTR(result); + } + + if (hca->ops.rdma_netdev_get_params) { + int rc = hca->ops.rdma_netdev_get_params(hca, port, + RDMA_NETDEV_IPOIB, + ¶ms); + + if (!rc && ops->priv_size < params.sizeof_priv) + ops->priv_size = params.sizeof_priv; + } + /* + * We cannot set priv_destructor before register_netdev because we + * need priv to be always valid during the error flow to execute + * ipoib_parent_unregister_pre(). Instead handle it manually and only + * enter priv_destructor mode once we are completely registered. + */ + ndev->priv_destructor = ipoib_intf_free; + + if (ipoib_intercept_dev_id_attr(ndev)) + goto sysfs_failed; + if (ipoib_cm_add_mode_attr(ndev)) + goto sysfs_failed; + if (ipoib_add_pkey_attr(ndev)) + goto sysfs_failed; + if (ipoib_add_umcast_attr(ndev)) + goto sysfs_failed; + if (device_create_file(&ndev->dev, &dev_attr_create_child)) + goto sysfs_failed; + if (device_create_file(&ndev->dev, &dev_attr_delete_child)) + goto sysfs_failed; + + return ndev; + +sysfs_failed: + ipoib_parent_unregister_pre(ndev); + unregister_netdev(ndev); + return ERR_PTR(-ENOMEM); +} + +static int ipoib_add_one(struct ib_device *device) +{ + struct list_head *dev_list; + struct net_device *dev; + struct ipoib_dev_priv *priv; + unsigned int p; + int count = 0; + + dev_list = kmalloc(sizeof(*dev_list), GFP_KERNEL); + if (!dev_list) + return -ENOMEM; + + INIT_LIST_HEAD(dev_list); + + rdma_for_each_port (device, p) { + if (!rdma_protocol_ib(device, p)) + continue; + dev = ipoib_add_port("ib%d", device, p); + if (!IS_ERR(dev)) { + priv = ipoib_priv(dev); + list_add_tail(&priv->list, dev_list); + count++; + } + } + + if (!count) { + kfree(dev_list); + return -EOPNOTSUPP; + } + + ib_set_client_data(device, &ipoib_client, dev_list); + return 0; +} + +static void ipoib_remove_one(struct ib_device *device, void *client_data) +{ + struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv; + struct list_head *dev_list = client_data; + + list_for_each_entry_safe(priv, tmp, dev_list, list) { + LIST_HEAD(head); + ipoib_parent_unregister_pre(priv->dev); + + rtnl_lock(); + + list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, + list) + unregister_netdevice_queue(cpriv->dev, &head); + unregister_netdevice_queue(priv->dev, &head); + unregister_netdevice_many(&head); + + rtnl_unlock(); + } + + kfree(dev_list); +} + +#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG +static struct notifier_block ipoib_netdev_notifier = { + .notifier_call = ipoib_netdev_event, +}; +#endif + +static int __init ipoib_init_module(void) +{ + int ret; + + ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size); + ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE); + ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE); + + ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size); + ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE); + ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE); +#ifdef CONFIG_INFINIBAND_IPOIB_CM + ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP); + ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0); +#endif + + /* + * When copying small received packets, we only copy from the + * linear data part of the SKB, so we rely on this condition. + */ + BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE); + + ipoib_register_debugfs(); + + /* + * We create a global workqueue here that is used for all flush + * operations. However, if you attempt to flush a workqueue + * from a task on that same workqueue, it deadlocks the system. + * We want to be able to flush the tasks associated with a + * specific net device, so we also create a workqueue for each + * netdevice. We queue up the tasks for that device only on + * its private workqueue, and we only queue up flush events + * on our global flush workqueue. This avoids the deadlocks. + */ + ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush", 0); + if (!ipoib_workqueue) { + ret = -ENOMEM; + goto err_fs; + } + + ib_sa_register_client(&ipoib_sa_client); + + ret = ib_register_client(&ipoib_client); + if (ret) + goto err_sa; + + ret = ipoib_netlink_init(); + if (ret) + goto err_client; + +#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG + register_netdevice_notifier(&ipoib_netdev_notifier); +#endif + return 0; + +err_client: + ib_unregister_client(&ipoib_client); + +err_sa: + ib_sa_unregister_client(&ipoib_sa_client); + destroy_workqueue(ipoib_workqueue); + +err_fs: + ipoib_unregister_debugfs(); + + return ret; +} + +static void __exit ipoib_cleanup_module(void) +{ +#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG + unregister_netdevice_notifier(&ipoib_netdev_notifier); +#endif + ipoib_netlink_fini(); + ib_unregister_client(&ipoib_client); + ib_sa_unregister_client(&ipoib_sa_client); + ipoib_unregister_debugfs(); + destroy_workqueue(ipoib_workqueue); +} + +module_init(ipoib_init_module); +module_exit(ipoib_cleanup_module); |