From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- drivers/infiniband/ulp/ipoib/ipoib_vlan.c | 293 ++++++++++++++++++++++++++++++ 1 file changed, 293 insertions(+) create mode 100644 drivers/infiniband/ulp/ipoib/ipoib_vlan.c (limited to 'drivers/infiniband/ulp/ipoib/ipoib_vlan.c') diff --git a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c new file mode 100644 index 000000000..4bd161e86 --- /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 + +#include +#include + +#include + +#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; +} -- cgit v1.2.3