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authorMatan Barak <matanb@mellanox.com>2015-07-30 18:33:26 +0300
committerDoug Ledford <dledford@redhat.com>2015-08-30 18:08:50 -0400
commit03db3a2d81e6e84f3ed3cb9e087cae17d762642b (patch)
tree772aff939dea090e0e7e2e4e37ca76c044d17403 /drivers/infiniband/core/roce_gid_mgmt.c
parentIB/core: Make ib_alloc_device init the kobject (diff)
downloadlinux-dev-03db3a2d81e6e84f3ed3cb9e087cae17d762642b.tar.xz
linux-dev-03db3a2d81e6e84f3ed3cb9e087cae17d762642b.zip
IB/core: Add RoCE GID table management
RoCE GIDs are based on IP addresses configured on Ethernet net-devices which relate to the RDMA (RoCE) device port. Currently, each of the low-level drivers that support RoCE (ocrdma, mlx4) manages its own RoCE port GID table. As there's nothing which is essentially vendor specific, we generalize that, and enhance the RDMA core GID cache to do this job. In order to populate the GID table, we listen for events: (a) netdev up/down/change_addr events - if a netdev is built onto our RoCE device, we need to add/delete its IPs. This involves adding all GIDs related to this ndev, add default GIDs, etc. (b) inet events - add new GIDs (according to the IP addresses) to the table. For programming the port RoCE GID table, providers must implement the add_gid and del_gid callbacks. RoCE GID management requires us to state the associated net_device alongside the GID. This information is necessary in order to manage the GID table. For example, when a net_device is removed, its associated GIDs need to be removed as well. RoCE mandates generating a default GID for each port, based on the related net-device's IPv6 link local. In contrast to the GID based on the regular IPv6 link-local (as we generate GID per IP address), the default GID is also available when the net device is down (in order to support loopback). Locking is done as follows: The patch modify the GID table code both for new RoCE drivers implementing the add_gid/del_gid callbacks and for current RoCE and IB drivers that do not. The flows for updating the table are different, so the locking requirements are too. While updating RoCE GID table, protection against multiple writers is achieved via mutex_lock(&table->lock). Since writing to a table requires us to find an entry (possible a free entry) in the table and then modify it, this mutex protects both the find_gid and write_gid ensuring the atomicity of the action. Each entry in the GID cache is protected by rwlock. In RoCE, writing (usually results from netdev notifier) involves invoking the vendor's add_gid and del_gid callbacks, which could sleep. Therefore, an invalid flag is added for each entry. Updates for RoCE are done via a workqueue, thus sleeping is permitted. In IB, updates are done in write_lock_irq(&device->cache.lock), thus write_gid isn't allowed to sleep and add_gid/del_gid are not called. When passing net-device into/out-of the GID cache, the device is always passed held (dev_hold). The code uses a single work item for updating all RDMA devices, following a netdev or inet notifier. The patch moves the cache from being a client (which was incorrect, as the cache is part of the IB infrastructure) to being explicitly initialized/freed when a device is registered/removed. Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband/core/roce_gid_mgmt.c')
-rw-r--r--drivers/infiniband/core/roce_gid_mgmt.c465
1 files changed, 465 insertions, 0 deletions
diff --git a/drivers/infiniband/core/roce_gid_mgmt.c b/drivers/infiniband/core/roce_gid_mgmt.c
new file mode 100644
index 000000000000..7bf4798ec7e2
--- /dev/null
+++ b/drivers/infiniband/core/roce_gid_mgmt.c
@@ -0,0 +1,465 @@
+/*
+ * Copyright (c) 2015, Mellanox Technologies 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 "core_priv.h"
+
+#include <linux/in.h>
+#include <linux/in6.h>
+
+/* For in6_dev_get/in6_dev_put */
+#include <net/addrconf.h>
+
+#include <rdma/ib_cache.h>
+#include <rdma/ib_addr.h>
+
+enum gid_op_type {
+ GID_DEL = 0,
+ GID_ADD
+};
+
+struct update_gid_event_work {
+ struct work_struct work;
+ union ib_gid gid;
+ struct ib_gid_attr gid_attr;
+ enum gid_op_type gid_op;
+};
+
+#define ROCE_NETDEV_CALLBACK_SZ 2
+struct netdev_event_work_cmd {
+ roce_netdev_callback cb;
+ roce_netdev_filter filter;
+};
+
+struct netdev_event_work {
+ struct work_struct work;
+ struct netdev_event_work_cmd cmds[ROCE_NETDEV_CALLBACK_SZ];
+ struct net_device *ndev;
+};
+
+static void update_gid(enum gid_op_type gid_op, struct ib_device *ib_dev,
+ u8 port, union ib_gid *gid,
+ struct ib_gid_attr *gid_attr)
+{
+ switch (gid_op) {
+ case GID_ADD:
+ ib_cache_gid_add(ib_dev, port, gid, gid_attr);
+ break;
+ case GID_DEL:
+ ib_cache_gid_del(ib_dev, port, gid, gid_attr);
+ break;
+ }
+}
+
+static int is_eth_port_of_netdev(struct ib_device *ib_dev, u8 port,
+ struct net_device *rdma_ndev, void *cookie)
+{
+ struct net_device *real_dev;
+ struct net_device *master_dev;
+ struct net_device *event_ndev = (struct net_device *)cookie;
+ int res;
+
+ if (!rdma_ndev)
+ return 0;
+
+ rcu_read_lock();
+ master_dev = netdev_master_upper_dev_get_rcu(rdma_ndev);
+ real_dev = rdma_vlan_dev_real_dev(event_ndev);
+ res = (real_dev ? real_dev : event_ndev) ==
+ (master_dev ? master_dev : rdma_ndev);
+ rcu_read_unlock();
+
+ return res;
+}
+
+static int pass_all_filter(struct ib_device *ib_dev, u8 port,
+ struct net_device *rdma_ndev, void *cookie)
+{
+ return 1;
+}
+
+static void update_gid_ip(enum gid_op_type gid_op,
+ struct ib_device *ib_dev,
+ u8 port, struct net_device *ndev,
+ struct sockaddr *addr)
+{
+ union ib_gid gid;
+ struct ib_gid_attr gid_attr;
+
+ rdma_ip2gid(addr, &gid);
+ memset(&gid_attr, 0, sizeof(gid_attr));
+ gid_attr.ndev = ndev;
+
+ update_gid(gid_op, ib_dev, port, &gid, &gid_attr);
+}
+
+static void enum_netdev_default_gids(struct ib_device *ib_dev,
+ u8 port, struct net_device *event_ndev,
+ struct net_device *rdma_ndev)
+{
+ if (rdma_ndev != event_ndev)
+ return;
+
+ ib_cache_gid_set_default_gid(ib_dev, port, rdma_ndev,
+ IB_CACHE_GID_DEFAULT_MODE_SET);
+}
+
+static void enum_netdev_ipv4_ips(struct ib_device *ib_dev,
+ u8 port, struct net_device *ndev)
+{
+ struct in_device *in_dev;
+
+ if (ndev->reg_state >= NETREG_UNREGISTERING)
+ return;
+
+ in_dev = in_dev_get(ndev);
+ if (!in_dev)
+ return;
+
+ for_ifa(in_dev) {
+ struct sockaddr_in ip;
+
+ ip.sin_family = AF_INET;
+ ip.sin_addr.s_addr = ifa->ifa_address;
+ update_gid_ip(GID_ADD, ib_dev, port, ndev,
+ (struct sockaddr *)&ip);
+ }
+ endfor_ifa(in_dev);
+
+ in_dev_put(in_dev);
+}
+
+static void enum_netdev_ipv6_ips(struct ib_device *ib_dev,
+ u8 port, struct net_device *ndev)
+{
+ struct inet6_ifaddr *ifp;
+ struct inet6_dev *in6_dev;
+ struct sin6_list {
+ struct list_head list;
+ struct sockaddr_in6 sin6;
+ };
+ struct sin6_list *sin6_iter;
+ struct sin6_list *sin6_temp;
+ struct ib_gid_attr gid_attr = {.ndev = ndev};
+ LIST_HEAD(sin6_list);
+
+ if (ndev->reg_state >= NETREG_UNREGISTERING)
+ return;
+
+ in6_dev = in6_dev_get(ndev);
+ if (!in6_dev)
+ return;
+
+ read_lock_bh(&in6_dev->lock);
+ list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
+ struct sin6_list *entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
+
+ if (!entry) {
+ pr_warn("roce_gid_mgmt: couldn't allocate entry for IPv6 update\n");
+ continue;
+ }
+
+ entry->sin6.sin6_family = AF_INET6;
+ entry->sin6.sin6_addr = ifp->addr;
+ list_add_tail(&entry->list, &sin6_list);
+ }
+ read_unlock_bh(&in6_dev->lock);
+
+ in6_dev_put(in6_dev);
+
+ list_for_each_entry_safe(sin6_iter, sin6_temp, &sin6_list, list) {
+ union ib_gid gid;
+
+ rdma_ip2gid((struct sockaddr *)&sin6_iter->sin6, &gid);
+ update_gid(GID_ADD, ib_dev, port, &gid, &gid_attr);
+ list_del(&sin6_iter->list);
+ kfree(sin6_iter);
+ }
+}
+
+static void add_netdev_ips(struct ib_device *ib_dev, u8 port,
+ struct net_device *rdma_ndev, void *cookie)
+{
+ struct net_device *event_ndev = (struct net_device *)cookie;
+
+ enum_netdev_default_gids(ib_dev, port, event_ndev, rdma_ndev);
+ enum_netdev_ipv4_ips(ib_dev, port, event_ndev);
+ if (IS_ENABLED(CONFIG_IPV6))
+ enum_netdev_ipv6_ips(ib_dev, port, event_ndev);
+}
+
+static void del_netdev_ips(struct ib_device *ib_dev, u8 port,
+ struct net_device *rdma_ndev, void *cookie)
+{
+ struct net_device *event_ndev = (struct net_device *)cookie;
+
+ ib_cache_gid_del_all_netdev_gids(ib_dev, port, event_ndev);
+}
+
+static void enum_all_gids_of_dev_cb(struct ib_device *ib_dev,
+ u8 port,
+ struct net_device *rdma_ndev,
+ void *cookie)
+{
+ struct net *net;
+ struct net_device *ndev;
+
+ /* Lock the rtnl to make sure the netdevs does not move under
+ * our feet
+ */
+ rtnl_lock();
+ for_each_net(net)
+ for_each_netdev(net, ndev)
+ if (is_eth_port_of_netdev(ib_dev, port, rdma_ndev, ndev))
+ add_netdev_ips(ib_dev, port, rdma_ndev, ndev);
+ rtnl_unlock();
+}
+
+/* This function will rescan all of the network devices in the system
+ * and add their gids, as needed, to the relevant RoCE devices. */
+int roce_rescan_device(struct ib_device *ib_dev)
+{
+ ib_enum_roce_netdev(ib_dev, pass_all_filter, NULL,
+ enum_all_gids_of_dev_cb, NULL);
+
+ return 0;
+}
+
+static void callback_for_addr_gid_device_scan(struct ib_device *device,
+ u8 port,
+ struct net_device *rdma_ndev,
+ void *cookie)
+{
+ struct update_gid_event_work *parsed = cookie;
+
+ return update_gid(parsed->gid_op, device,
+ port, &parsed->gid,
+ &parsed->gid_attr);
+}
+
+/* The following functions operate on all IB devices. netdevice_event and
+ * addr_event execute ib_enum_all_roce_netdevs through a work.
+ * ib_enum_all_roce_netdevs iterates through all IB devices.
+ */
+
+static void netdevice_event_work_handler(struct work_struct *_work)
+{
+ struct netdev_event_work *work =
+ container_of(_work, struct netdev_event_work, work);
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(work->cmds) && work->cmds[i].cb; i++)
+ ib_enum_all_roce_netdevs(work->cmds[i].filter, work->ndev,
+ work->cmds[i].cb, work->ndev);
+
+ dev_put(work->ndev);
+ kfree(work);
+}
+
+static int netdevice_queue_work(struct netdev_event_work_cmd *cmds,
+ struct net_device *ndev)
+{
+ struct netdev_event_work *ndev_work =
+ kmalloc(sizeof(*ndev_work), GFP_KERNEL);
+
+ if (!ndev_work) {
+ pr_warn("roce_gid_mgmt: can't allocate work for netdevice_event\n");
+ return NOTIFY_DONE;
+ }
+
+ memcpy(ndev_work->cmds, cmds, sizeof(ndev_work->cmds));
+ ndev_work->ndev = ndev;
+ dev_hold(ndev);
+ INIT_WORK(&ndev_work->work, netdevice_event_work_handler);
+
+ queue_work(ib_wq, &ndev_work->work);
+
+ return NOTIFY_DONE;
+}
+
+static int netdevice_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ static const struct netdev_event_work_cmd add_cmd = {
+ .cb = add_netdev_ips, .filter = is_eth_port_of_netdev};
+ static const struct netdev_event_work_cmd del_cmd = {
+ .cb = del_netdev_ips, .filter = pass_all_filter};
+ struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
+ struct netdev_event_work_cmd cmds[ROCE_NETDEV_CALLBACK_SZ] = { {NULL} };
+
+ if (ndev->type != ARPHRD_ETHER)
+ return NOTIFY_DONE;
+
+ switch (event) {
+ case NETDEV_REGISTER:
+ case NETDEV_UP:
+ cmds[0] = add_cmd;
+ break;
+
+ case NETDEV_UNREGISTER:
+ if (ndev->reg_state < NETREG_UNREGISTERED)
+ cmds[0] = del_cmd;
+ else
+ return NOTIFY_DONE;
+ break;
+
+ case NETDEV_CHANGEADDR:
+ cmds[0] = del_cmd;
+ cmds[1] = add_cmd;
+ break;
+ default:
+ return NOTIFY_DONE;
+ }
+
+ return netdevice_queue_work(cmds, ndev);
+}
+
+static void update_gid_event_work_handler(struct work_struct *_work)
+{
+ struct update_gid_event_work *work =
+ container_of(_work, struct update_gid_event_work, work);
+
+ ib_enum_all_roce_netdevs(is_eth_port_of_netdev, work->gid_attr.ndev,
+ callback_for_addr_gid_device_scan, work);
+
+ dev_put(work->gid_attr.ndev);
+ kfree(work);
+}
+
+static int addr_event(struct notifier_block *this, unsigned long event,
+ struct sockaddr *sa, struct net_device *ndev)
+{
+ struct update_gid_event_work *work;
+ enum gid_op_type gid_op;
+
+ if (ndev->type != ARPHRD_ETHER)
+ return NOTIFY_DONE;
+
+ switch (event) {
+ case NETDEV_UP:
+ gid_op = GID_ADD;
+ break;
+
+ case NETDEV_DOWN:
+ gid_op = GID_DEL;
+ break;
+
+ default:
+ return NOTIFY_DONE;
+ }
+
+ work = kmalloc(sizeof(*work), GFP_ATOMIC);
+ if (!work) {
+ pr_warn("roce_gid_mgmt: Couldn't allocate work for addr_event\n");
+ return NOTIFY_DONE;
+ }
+
+ INIT_WORK(&work->work, update_gid_event_work_handler);
+
+ rdma_ip2gid(sa, &work->gid);
+ work->gid_op = gid_op;
+
+ memset(&work->gid_attr, 0, sizeof(work->gid_attr));
+ dev_hold(ndev);
+ work->gid_attr.ndev = ndev;
+
+ queue_work(ib_wq, &work->work);
+
+ return NOTIFY_DONE;
+}
+
+static int inetaddr_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ struct sockaddr_in in;
+ struct net_device *ndev;
+ struct in_ifaddr *ifa = ptr;
+
+ in.sin_family = AF_INET;
+ in.sin_addr.s_addr = ifa->ifa_address;
+ ndev = ifa->ifa_dev->dev;
+
+ return addr_event(this, event, (struct sockaddr *)&in, ndev);
+}
+
+static int inet6addr_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ struct sockaddr_in6 in6;
+ struct net_device *ndev;
+ struct inet6_ifaddr *ifa6 = ptr;
+
+ in6.sin6_family = AF_INET6;
+ in6.sin6_addr = ifa6->addr;
+ ndev = ifa6->idev->dev;
+
+ return addr_event(this, event, (struct sockaddr *)&in6, ndev);
+}
+
+static struct notifier_block nb_netdevice = {
+ .notifier_call = netdevice_event
+};
+
+static struct notifier_block nb_inetaddr = {
+ .notifier_call = inetaddr_event
+};
+
+static struct notifier_block nb_inet6addr = {
+ .notifier_call = inet6addr_event
+};
+
+int __init roce_gid_mgmt_init(void)
+{
+ register_inetaddr_notifier(&nb_inetaddr);
+ if (IS_ENABLED(CONFIG_IPV6))
+ register_inet6addr_notifier(&nb_inet6addr);
+ /* We relay on the netdevice notifier to enumerate all
+ * existing devices in the system. Register to this notifier
+ * last to make sure we will not miss any IP add/del
+ * callbacks.
+ */
+ register_netdevice_notifier(&nb_netdevice);
+
+ return 0;
+}
+
+void __exit roce_gid_mgmt_cleanup(void)
+{
+ if (IS_ENABLED(CONFIG_IPV6))
+ unregister_inet6addr_notifier(&nb_inet6addr);
+ unregister_inetaddr_notifier(&nb_inetaddr);
+ unregister_netdevice_notifier(&nb_netdevice);
+ /* Ensure all gid deletion tasks complete before we go down,
+ * to avoid any reference to free'd memory. By the time
+ * ib-core is removed, all physical devices have been removed,
+ * so no issue with remaining hardware contexts.
+ */
+}