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Diffstat (limited to 'drivers/infiniband/ulp/ipoib/ipoib_vlan.c')
-rw-r--r--drivers/infiniband/ulp/ipoib/ipoib_vlan.c293
1 files changed, 293 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
new file mode 100644
index 0000000000..4bd161e86f
--- /dev/null
+++ b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
@@ -0,0 +1,293 @@
+/*
+ * Copyright (c) 2004 Topspin Communications. 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 <linux/sched/signal.h>
+
+#include <linux/init.h>
+#include <linux/seq_file.h>
+
+#include <linux/uaccess.h>
+
+#include "ipoib.h"
+
+static ssize_t parent_show(struct device *d, struct device_attribute *attr,
+ char *buf)
+{
+ struct net_device *dev = to_net_dev(d);
+ struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+ return sysfs_emit(buf, "%s\n", priv->parent->name);
+}
+static DEVICE_ATTR_RO(parent);
+
+static bool is_child_unique(struct ipoib_dev_priv *ppriv,
+ struct ipoib_dev_priv *priv)
+{
+ struct ipoib_dev_priv *tpriv;
+
+ ASSERT_RTNL();
+
+ /*
+ * Since the legacy sysfs interface uses pkey for deletion it cannot
+ * support more than one interface with the same pkey, it creates
+ * ambiguity. The RTNL interface deletes using the netdev so it does
+ * not have a problem to support duplicated pkeys.
+ */
+ if (priv->child_type != IPOIB_LEGACY_CHILD)
+ return true;
+
+ /*
+ * First ensure this isn't a duplicate. We check the parent device and
+ * then all of the legacy child interfaces to make sure the Pkey
+ * doesn't match.
+ */
+ if (ppriv->pkey == priv->pkey)
+ return false;
+
+ list_for_each_entry(tpriv, &ppriv->child_intfs, list) {
+ if (tpriv->pkey == priv->pkey &&
+ tpriv->child_type == IPOIB_LEGACY_CHILD)
+ return false;
+ }
+
+ return true;
+}
+
+/*
+ * NOTE: If this function fails then the priv->dev will remain valid, however
+ * priv will have been freed and must not be touched by caller in the error
+ * case.
+ *
+ * If (ndev->reg_state == NETREG_UNINITIALIZED) then it is up to the caller to
+ * free the net_device (just as rtnl_newlink does) otherwise the net_device
+ * will be freed when the rtnl is unlocked.
+ */
+int __ipoib_vlan_add(struct ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
+ u16 pkey, int type)
+{
+ struct net_device *ndev = priv->dev;
+ int result;
+ struct rdma_netdev *rn = netdev_priv(ndev);
+
+ ASSERT_RTNL();
+
+ /*
+ * We do not need to touch priv if register_netdevice fails, so just
+ * always use this flow.
+ */
+ ndev->priv_destructor = ipoib_intf_free;
+
+ /*
+ * Racing with unregister of the parent must be prevented by the
+ * caller.
+ */
+ WARN_ON(ppriv->dev->reg_state != NETREG_REGISTERED);
+
+ if (pkey == 0 || pkey == 0x8000) {
+ result = -EINVAL;
+ goto out_early;
+ }
+
+ rn->mtu = priv->mcast_mtu;
+
+ priv->parent = ppriv->dev;
+ priv->pkey = pkey;
+ priv->child_type = type;
+
+ if (!is_child_unique(ppriv, priv)) {
+ result = -ENOTUNIQ;
+ goto out_early;
+ }
+
+ result = register_netdevice(ndev);
+ if (result) {
+ ipoib_warn(priv, "failed to initialize; error %i", result);
+
+ /*
+ * register_netdevice sometimes calls priv_destructor,
+ * sometimes not. Make sure it was done.
+ */
+ goto out_early;
+ }
+
+ /* RTNL childs don't need proprietary sysfs entries */
+ if (type == IPOIB_LEGACY_CHILD) {
+ 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_parent))
+ goto sysfs_failed;
+ }
+
+ return 0;
+
+sysfs_failed:
+ unregister_netdevice(priv->dev);
+ return -ENOMEM;
+
+out_early:
+ if (ndev->priv_destructor)
+ ndev->priv_destructor(ndev);
+ return result;
+}
+
+int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
+{
+ struct ipoib_dev_priv *ppriv, *priv;
+ char intf_name[IFNAMSIZ];
+ struct net_device *ndev;
+ int result;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ if (pdev->reg_state != NETREG_REGISTERED) {
+ rtnl_unlock();
+ return -EPERM;
+ }
+
+ ppriv = ipoib_priv(pdev);
+
+ snprintf(intf_name, sizeof(intf_name), "%s.%04x",
+ ppriv->dev->name, pkey);
+
+ ndev = ipoib_intf_alloc(ppriv->ca, ppriv->port, intf_name);
+ if (IS_ERR(ndev)) {
+ result = PTR_ERR(ndev);
+ goto out;
+ }
+ priv = ipoib_priv(ndev);
+
+ ndev->rtnl_link_ops = ipoib_get_link_ops();
+
+ result = __ipoib_vlan_add(ppriv, priv, pkey, IPOIB_LEGACY_CHILD);
+
+ if (result && ndev->reg_state == NETREG_UNINITIALIZED)
+ free_netdev(ndev);
+
+out:
+ rtnl_unlock();
+
+ return result;
+}
+
+struct ipoib_vlan_delete_work {
+ struct work_struct work;
+ struct net_device *dev;
+};
+
+/*
+ * sysfs callbacks of a netdevice cannot obtain the rtnl lock as
+ * unregister_netdev ultimately deletes the sysfs files while holding the rtnl
+ * lock. This deadlocks the system.
+ *
+ * A callback can use rtnl_trylock to avoid the deadlock but it cannot call
+ * unregister_netdev as that internally takes and releases the rtnl_lock. So
+ * instead we find the netdev to unregister and then do the actual unregister
+ * from the global work queue where we can obtain the rtnl_lock safely.
+ */
+static void ipoib_vlan_delete_task(struct work_struct *work)
+{
+ struct ipoib_vlan_delete_work *pwork =
+ container_of(work, struct ipoib_vlan_delete_work, work);
+ struct net_device *dev = pwork->dev;
+
+ rtnl_lock();
+
+ /* Unregistering tasks can race with another task or parent removal */
+ if (dev->reg_state == NETREG_REGISTERED) {
+ struct ipoib_dev_priv *priv = ipoib_priv(dev);
+ struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
+
+ ipoib_dbg(ppriv, "delete child vlan %s\n", dev->name);
+ unregister_netdevice(dev);
+ }
+
+ rtnl_unlock();
+
+ kfree(pwork);
+}
+
+int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey)
+{
+ struct ipoib_dev_priv *ppriv, *priv, *tpriv;
+ int rc;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
+
+ if (pdev->reg_state != NETREG_REGISTERED) {
+ rtnl_unlock();
+ return -EPERM;
+ }
+
+ ppriv = ipoib_priv(pdev);
+
+ rc = -ENODEV;
+ list_for_each_entry_safe(priv, tpriv, &ppriv->child_intfs, list) {
+ if (priv->pkey == pkey &&
+ priv->child_type == IPOIB_LEGACY_CHILD) {
+ struct ipoib_vlan_delete_work *work;
+
+ work = kmalloc(sizeof(*work), GFP_KERNEL);
+ if (!work) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ down_write(&ppriv->vlan_rwsem);
+ list_del_init(&priv->list);
+ up_write(&ppriv->vlan_rwsem);
+ work->dev = priv->dev;
+ INIT_WORK(&work->work, ipoib_vlan_delete_task);
+ queue_work(ipoib_workqueue, &work->work);
+
+ rc = 0;
+ break;
+ }
+ }
+
+out:
+ rtnl_unlock();
+
+ return rc;
+}