--- /dev/null
+/*
+ * 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>
+
+#define DRV_VERSION "1.0.0"
+
+const char ipoib_driver_version[] = DRV_VERSION;
+
+MODULE_AUTHOR("Roland Dreier");
+MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_VERSION(DRV_VERSION);
+
+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 void ipoib_add_one(struct ib_device *device);
+static void ipoib_remove_one(struct ib_device *device);
+static void ipoib_neigh_reclaim(struct rcu_head *rp);
+
+static struct ib_client ipoib_client = {
+ .name = "ipoib",
+ .add = ipoib_add_one,
+ .remove = ipoib_remove_one
+};
+
+int ipoib_open(struct net_device *dev)
+{
+ struct ipoib_dev_priv *priv = netdev_priv(dev);
+
+ ipoib_dbg(priv, "bringing up interface\n");
+
+ netif_carrier_off(dev);
+
+ set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
+
+ if (ipoib_ib_dev_open(dev)) {
+ if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
+ return 0;
+ goto err_disable;
+ }
+
+ if (ipoib_ib_dev_up(dev))
+ goto err_stop;
+
+ 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);
+ }
+ up_read(&priv->vlan_rwsem);
+ }
+
+ netif_start_queue(dev);
+
+ return 0;
+
+err_stop:
+ ipoib_ib_dev_stop(dev);
+
+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 = netdev_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);
+ }
+ up_read(&priv->vlan_rwsem);
+ }
+
+ return 0;
+}
+
+static void ipoib_uninit(struct net_device *dev)
+{
+ ipoib_dev_cleanup(dev);
+}
+
+static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
+{
+ struct ipoib_dev_priv *priv = netdev_priv(dev);
+
+ if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
+ features &= ~(NETIF_F_SG | 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 = netdev_priv(dev);
+
+ /* 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 > IPOIB_UD_MTU(priv->max_ib_mtu))
+ return -EINVAL;
+
+ priv->admin_mtu = new_mtu;
+
+ dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
+
+ return 0;
+}
+
+int ipoib_set_mode(struct net_device *dev, const char *buf)
+{
+ struct ipoib_dev_priv *priv = netdev_priv(dev);
+
+ /* 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);
+ rtnl_unlock();
+ priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
+
+ ipoib_flush_paths(dev);
+ rtnl_lock();
+ return 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));
+ rtnl_unlock();
+ ipoib_flush_paths(dev);
+ rtnl_lock();
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
+{
+ struct ipoib_dev_priv *priv = netdev_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 = netdev_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(netdev_priv(dev), "path_free\n");
+
+ /* 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 = netdev_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 = netdev_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%04x GID %pI6 invalid\n",
+ be16_to_cpu(path->pathrec.dlid),
+ path->pathrec.dgid.raw);
+ path->valid = 0;
+ }
+
+ spin_unlock_irq(&priv->lock);
+}
+
+void ipoib_flush_paths(struct net_device *dev)
+{
+ struct ipoib_dev_priv *priv = netdev_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 ib_sa_path_rec *pathrec,
+ void *path_ptr)
+{
+ struct ipoib_path *path = path_ptr;
+ struct net_device *dev = path->dev;
+ struct ipoib_dev_priv *priv = netdev_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",
+ be16_to_cpu(pathrec->dlid), 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 ib_ah_attr av;
+
+ if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
+ ah = ipoib_create_ah(dev, priv->pd, &av);
+ }
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ if (!IS_ERR_OR_NULL(ah)) {
+ 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, be16_to_cpu(pathrec->dlid), 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->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))) {
+ skb->dev = dev;
+ if (dev_queue_xmit(skb))
+ ipoib_warn(priv, "dev_queue_xmit failed "
+ "to requeue packet\n");
+ }
+}
+
+static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
+{
+ struct ipoib_dev_priv *priv = netdev_priv(dev);
+ struct ipoib_path *path;
+
+ if (!priv->broadcast)
+ return NULL;
+
+ path = kzalloc(sizeof *path, GFP_ATOMIC);
+ if (!path)
+ return NULL;
+
+ path->dev = dev;
+
+ skb_queue_head_init(&path->queue);
+
+ INIT_LIST_HEAD(&path->neigh_list);
+
+ 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;
+
+ return path;
+}
+
+static int path_rec_start(struct net_device *dev,
+ struct ipoib_path *path)
+{
+ struct ipoib_dev_priv *priv = netdev_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_add_path(struct sk_buff *skb, u8 *daddr,
+ struct net_device *dev)
+{
+ struct ipoib_dev_priv *priv = 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;
+ }
+
+ 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) {
+ 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)
+ __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);
+ ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr));
+ ipoib_neigh_put(neigh);
+ return;
+ }
+ } 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)
+ __skb_queue_tail(&neigh->queue, skb);
+ else
+ goto err_drop;
+ }
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+ ipoib_neigh_put(neigh);
+ return;
+
+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);
+}
+
+static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
+ struct ipoib_cb *cb)
+{
+ struct ipoib_dev_priv *priv = netdev_priv(dev);
+ struct ipoib_path *path;
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ path = __path_find(dev, cb->hwaddr + 4);
+ if (!path || !path->valid) {
+ int new_path = 0;
+
+ if (!path) {
+ path = path_rec_create(dev, cb->hwaddr + 4);
+ new_path = 1;
+ }
+ if (path) {
+ if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
+ __skb_queue_tail(&path->queue, skb);
+ } else {
+ ++dev->stats.tx_dropped;
+ dev_kfree_skb_any(skb);
+ }
+
+ if (!path->query && path_rec_start(dev, path)) {
+ spin_unlock_irqrestore(&priv->lock, flags);
+ if (new_path)
+ path_free(dev, path);
+ return;
+ } else
+ __path_add(dev, path);
+ } else {
+ ++dev->stats.tx_dropped;
+ dev_kfree_skb_any(skb);
+ }
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+ return;
+ }
+
+ if (path->ah) {
+ ipoib_dbg(priv, "Send unicast ARP to %04x\n",
+ be16_to_cpu(path->pathrec.dlid));
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+ ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr));
+ return;
+ } else if ((path->query || !path_rec_start(dev, path)) &&
+ skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
+ __skb_queue_tail(&path->queue, skb);
+ } else {
+ ++dev->stats.tx_dropped;
+ dev_kfree_skb_any(skb);
+ }
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ipoib_dev_priv *priv = netdev_priv(dev);
+ struct ipoib_neigh *neigh;
+ struct ipoib_cb *cb = ipoib_skb_cb(skb);
+ struct ipoib_header *header;
+ unsigned long flags;
+
+ header = (struct ipoib_header *) skb->data;
+
+ if (unlikely(cb->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*/
+ cb->hwaddr[8] = (priv->pkey >> 8) & 0xff;
+ cb->hwaddr[9] = priv->pkey & 0xff;
+
+ neigh = ipoib_neigh_get(dev, cb->hwaddr);
+ if (likely(neigh))
+ goto send_using_neigh;
+ ipoib_mcast_send(dev, cb->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, cb->hwaddr);
+ if (unlikely(!neigh)) {
+ neigh_add_path(skb, cb->hwaddr, dev);
+ 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, cb);
+ 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) {
+ ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(cb->hwaddr));
+ goto unref;
+ }
+
+ if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
+ 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)
+{
+ struct ipoib_dev_priv *priv = netdev_priv(dev);
+
+ ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
+ jiffies_to_msecs(jiffies - dev->trans_start));
+ ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
+ netif_queue_stopped(dev),
+ priv->tx_head, priv->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 len)
+{
+ struct ipoib_header *header;
+ struct ipoib_cb *cb = ipoib_skb_cb(skb);
+
+ header = (struct ipoib_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->cb so we can figure out where
+ * to send the packet later.
+ */
+ memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
+
+ return sizeof *header;
+}
+
+static void ipoib_set_mcast_list(struct net_device *dev)
+{
+ struct ipoib_dev_priv *priv = netdev_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 = netdev_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 = netdev_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;
+ }
+ 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;
+
+ if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
+ return;
+
+ 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;
+ /* handle possible race condition */
+ if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
+ 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) {
+ /* was the neigh idle for two GC periods */
+ if (time_after(neigh_obsolete, neigh->alive)) {
+ rcu_assign_pointer(*np,
+ rcu_dereference_protected(neigh->hnext,
+ lockdep_is_held(&priv->lock)));
+ /* remove from path/mc list */
+ list_del(&neigh->list);
+ call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
+ } else {
+ np = &neigh->hnext;
+ }
+
+ }
+ }
+
+out_unlock:
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+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);
+
+ if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
+ 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 = netdev_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 = netdev_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(netdev_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 = netdev_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(&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 **buckets;
+ u32 size;
+
+ clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
+ ntbl->htbl = NULL;
+ htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
+ if (!htbl)
+ return -ENOMEM;
+ set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
+ size = roundup_pow_of_two(arp_tbl.gc_thresh3);
+ buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
+ if (!buckets) {
+ kfree(htbl);
+ return -ENOMEM;
+ }
+ htbl->size = size;
+ htbl->mask = (size - 1);
+ htbl->buckets = buckets;
+ ntbl->htbl = htbl;
+ htbl->ntbl = ntbl;
+ atomic_set(&ntbl->entries, 0);
+
+ /* start garbage collection */
+ clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
+ 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;
+
+ kfree(buckets);
+ kfree(htbl);
+ complete(&ntbl->deleted);
+}
+
+void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
+{
+ struct ipoib_dev_priv *priv = netdev_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(&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);
+
+ 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(&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 = netdev_priv(dev);
+ int stopped;
+
+ ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
+ init_completion(&priv->ntbl.deleted);
+ set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
+
+ /* Stop GC if called at init fail need to cancel work */
+ stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
+ if (!stopped)
+ cancel_delayed_work(&priv->neigh_reap_task);
+
+ ipoib_flush_neighs(priv);
+
+ wait_for_completion(&priv->ntbl.deleted);
+}
+
+
+int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
+{
+ struct ipoib_dev_priv *priv = netdev_priv(dev);
+
+ /* Allocate RX/TX "rings" to hold queued skbs */
+ priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
+ GFP_KERNEL);
+ if (!priv->rx_ring) {
+ printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
+ ca->name, ipoib_recvq_size);
+ goto out;
+ }
+
+ priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
+ if (!priv->tx_ring) {
+ printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
+ ca->name, ipoib_sendq_size);
+ goto out_rx_ring_cleanup;
+ }
+
+ /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
+
+ if (ipoib_ib_dev_init(dev, ca, port))
+ goto out_tx_ring_cleanup;
+
+ /*
+ * Must be after ipoib_ib_dev_init so we can allocate a per
+ * device wq there and use it here
+ */
+ if (ipoib_neigh_hash_init(priv) < 0)
+ goto out_dev_uninit;
+
+ return 0;
+
+out_dev_uninit:
+ ipoib_ib_dev_cleanup(dev);
+
+out_tx_ring_cleanup:
+ vfree(priv->tx_ring);
+
+out_rx_ring_cleanup:
+ kfree(priv->rx_ring);
+
+out:
+ return -ENOMEM;
+}
+
+void ipoib_dev_cleanup(struct net_device *dev)
+{
+ struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
+ LIST_HEAD(head);
+
+ ASSERT_RTNL();
+
+ ipoib_delete_debug_files(dev);
+
+ /* Delete any child interfaces first */
+ list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
+ /* Stop GC on child */
+ set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
+ cancel_delayed_work(&cpriv->neigh_reap_task);
+ unregister_netdevice_queue(cpriv->dev, &head);
+ }
+ unregister_netdevice_many(&head);
+
+ /*
+ * Must be before ipoib_ib_dev_cleanup or we delete an in use
+ * work queue
+ */
+ ipoib_neigh_hash_uninit(dev);
+
+ ipoib_ib_dev_cleanup(dev);
+
+ kfree(priv->rx_ring);
+ vfree(priv->tx_ring);
+
+ priv->rx_ring = NULL;
+ priv->tx_ring = NULL;
+}
+
+static const struct header_ops ipoib_header_ops = {
+ .create = ipoib_hard_header,
+};
+
+static const struct net_device_ops ipoib_netdev_ops = {
+ .ndo_uninit = ipoib_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,
+};
+
+void ipoib_setup(struct net_device *dev)
+{
+ struct ipoib_dev_priv *priv = netdev_priv(dev);
+
+ dev->netdev_ops = &ipoib_netdev_ops;
+ dev->header_ops = &ipoib_header_ops;
+
+ ipoib_set_ethtool_ops(dev);
+
+ netif_napi_add(dev, &priv->napi, ipoib_poll, NAPI_POLL_WEIGHT);
+
+ dev->watchdog_timeo = HZ;
+
+ dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
+
+ dev->hard_header_len = IPOIB_ENCAP_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);
+
+ priv->dev = dev;
+
+ spin_lock_init(&priv->lock);
+
+ init_rwsem(&priv->vlan_rwsem);
+
+ 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);
+}
+
+struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
+{
+ struct net_device *dev;
+
+ dev = alloc_netdev((int)sizeof(struct ipoib_dev_priv), name,
+ NET_NAME_UNKNOWN, ipoib_setup);
+ if (!dev)
+ return NULL;
+
+ return netdev_priv(dev);
+}
+
+static ssize_t show_pkey(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
+
+ 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 ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
+
+ 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 = netdev_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 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;
+
+ /*
+ * Set the full membership bit, so that we join the right
+ * broadcast group, etc.
+ */
+ pkey |= 0x8000;
+
+ 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);
+}
+
+int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
+{
+ struct ib_device_attr *device_attr;
+ int result = -ENOMEM;
+
+ device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
+ if (!device_attr) {
+ printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
+ hca->name, sizeof *device_attr);
+ return result;
+ }
+
+ result = ib_query_device(hca, device_attr);
+ if (result) {
+ printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
+ hca->name, result);
+ kfree(device_attr);
+ return result;
+ }
+ priv->hca_caps = device_attr->device_cap_flags;
+
+ kfree(device_attr);
+
+ if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
+ priv->dev->hw_features = NETIF_F_SG |
+ 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;
+ }
+
+ return 0;
+}
+
+static struct net_device *ipoib_add_port(const char *format,
+ struct ib_device *hca, u8 port)
+{
+ struct ipoib_dev_priv *priv;
+ struct ib_port_attr attr;
+ int result = -ENOMEM;
+
+ priv = ipoib_intf_alloc(format);
+ if (!priv)
+ goto alloc_mem_failed;
+
+ SET_NETDEV_DEV(priv->dev, hca->dma_device);
+ priv->dev->dev_id = port - 1;
+
+ if (!ib_query_port(hca, port, &attr))
+ priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
+ else {
+ printk(KERN_WARNING "%s: ib_query_port %d failed\n",
+ hca->name, port);
+ goto device_init_failed;
+ }
+
+ /* MTU will be reset when mcast join happens */
+ priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
+ priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
+
+ priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
+
+ result = ib_query_pkey(hca, port, 0, &priv->pkey);
+ if (result) {
+ printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
+ hca->name, port, result);
+ goto device_init_failed;
+ }
+
+ if (ipoib_set_dev_features(priv, hca))
+ goto device_init_failed;
+
+ /*
+ * Set the full membership bit, so that we join the right
+ * broadcast group, etc.
+ */
+ priv->pkey |= 0x8000;
+
+ priv->dev->broadcast[8] = priv->pkey >> 8;
+ priv->dev->broadcast[9] = priv->pkey & 0xff;
+
+ result = ib_query_gid(hca, port, 0, &priv->local_gid);
+ if (result) {
+ printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
+ hca->name, port, result);
+ goto device_init_failed;
+ } else
+ memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
+
+ result = ipoib_dev_init(priv->dev, hca, port);
+ if (result < 0) {
+ printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
+ hca->name, port, result);
+ goto device_init_failed;
+ }
+
+ INIT_IB_EVENT_HANDLER(&priv->event_handler,
+ priv->ca, ipoib_event);
+ result = ib_register_event_handler(&priv->event_handler);
+ if (result < 0) {
+ printk(KERN_WARNING "%s: ib_register_event_handler failed for "
+ "port %d (ret = %d)\n",
+ hca->name, port, result);
+ goto event_failed;
+ }
+
+ result = register_netdev(priv->dev);
+ if (result) {
+ printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
+ hca->name, port, result);
+ goto register_failed;
+ }
+
+ ipoib_create_debug_files(priv->dev);
+
+ if (ipoib_cm_add_mode_attr(priv->dev))
+ goto sysfs_failed;
+ if (ipoib_add_pkey_attr(priv->dev))
+ goto sysfs_failed;
+ if (ipoib_add_umcast_attr(priv->dev))
+ goto sysfs_failed;
+ if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
+ goto sysfs_failed;
+ if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
+ goto sysfs_failed;
+
+ return priv->dev;
+
+sysfs_failed:
+ ipoib_delete_debug_files(priv->dev);
+ unregister_netdev(priv->dev);
+
+register_failed:
+ ib_unregister_event_handler(&priv->event_handler);
+ flush_workqueue(ipoib_workqueue);
+ /* Stop GC if started before flush */
+ set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
+ cancel_delayed_work(&priv->neigh_reap_task);
+ flush_workqueue(priv->wq);
+
+event_failed:
+ ipoib_dev_cleanup(priv->dev);
+
+device_init_failed:
+ free_netdev(priv->dev);
+
+alloc_mem_failed:
+ return ERR_PTR(result);
+}
+
+static void ipoib_add_one(struct ib_device *device)
+{
+ struct list_head *dev_list;
+ struct net_device *dev;
+ struct ipoib_dev_priv *priv;
+ int s, e, p;
+
+ if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
+ return;
+
+ dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
+ if (!dev_list)
+ return;
+
+ INIT_LIST_HEAD(dev_list);
+
+ if (device->node_type == RDMA_NODE_IB_SWITCH) {
+ s = 0;
+ e = 0;
+ } else {
+ s = 1;
+ e = device->phys_port_cnt;
+ }
+
+ for (p = s; p <= e; ++p) {
+ if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
+ continue;
+ dev = ipoib_add_port("ib%d", device, p);
+ if (!IS_ERR(dev)) {
+ priv = netdev_priv(dev);
+ list_add_tail(&priv->list, dev_list);
+ }
+ }
+
+ ib_set_client_data(device, &ipoib_client, dev_list);
+}
+
+static void ipoib_remove_one(struct ib_device *device)
+{
+ struct ipoib_dev_priv *priv, *tmp;
+ struct list_head *dev_list;
+
+ if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
+ return;
+
+ dev_list = ib_get_client_data(device, &ipoib_client);
+ if (!dev_list)
+ return;
+
+ list_for_each_entry_safe(priv, tmp, dev_list, list) {
+ ib_unregister_event_handler(&priv->event_handler);
+ flush_workqueue(ipoib_workqueue);
+
+ rtnl_lock();
+ dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
+ rtnl_unlock();
+
+ /* Stop GC */
+ set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
+ cancel_delayed_work(&priv->neigh_reap_task);
+ flush_workqueue(priv->wq);
+
+ unregister_netdev(priv->dev);
+ free_netdev(priv->dev);
+ }
+
+ kfree(dev_list);
+}
+
+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);
+#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);
+
+ ret = ipoib_register_debugfs();
+ if (ret)
+ return ret;
+
+ /*
+ * 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 = create_singlethread_workqueue("ipoib_flush");
+ 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;
+
+ 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)
+{
+ 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);
Code Review / kvmfornfv.git / blobdiff