1 files changed, 364 insertions, 5 deletions

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 7abeb7ceaa4c..68dbbfdee274 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -772,18 +772,377 @@ net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
         return error;
 }
 
-static int rx_queue_register_kobjects(struct net_device *net)
+/*
+ * netdev_queue sysfs structures and functions.
+ */
+struct netdev_queue_attribute {
+        struct attribute attr;
+        ssize_t (*show)(struct netdev_queue *queue,
+            struct netdev_queue_attribute *attr, char *buf);
+        ssize_t (*store)(struct netdev_queue *queue,
+            struct netdev_queue_attribute *attr, const char *buf, size_t len);
+};
+#define to_netdev_queue_attr(_attr) container_of(_attr,         \
+    struct netdev_queue_attribute, attr)
+
+#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
+
+static ssize_t netdev_queue_attr_show(struct kobject *kobj,
+                                      struct attribute *attr, char *buf)
+{
+        struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
+        struct netdev_queue *queue = to_netdev_queue(kobj);
+
+        if (!attribute->show)
+                return -EIO;
+
+        return attribute->show(queue, attribute, buf);
+}
+
+static ssize_t netdev_queue_attr_store(struct kobject *kobj,
+                                       struct attribute *attr,
+                                       const char *buf, size_t count)
+{
+        struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
+        struct netdev_queue *queue = to_netdev_queue(kobj);
+
+        if (!attribute->store)
+                return -EIO;
+
+        return attribute->store(queue, attribute, buf, count);
+}
+
+static const struct sysfs_ops netdev_queue_sysfs_ops = {
+        .show = netdev_queue_attr_show,
+        .store = netdev_queue_attr_store,
+};
+
+static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
 {
+        struct net_device *dev = queue->dev;
+        int i;
+
+        for (i = 0; i < dev->num_tx_queues; i++)
+                if (queue == &dev->_tx[i])
+                        break;
+
+        BUG_ON(i >= dev->num_tx_queues);
+
+        return i;
+}
+
+
+static ssize_t show_xps_map(struct netdev_queue *queue,
+                            struct netdev_queue_attribute *attribute, char *buf)
+{
+        struct net_device *dev = queue->dev;
+        struct xps_dev_maps *dev_maps;
+        cpumask_var_t mask;
+        unsigned long index;
+        size_t len = 0;
+        int i;
+
+        if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
+                return -ENOMEM;
+
+        index = get_netdev_queue_index(queue);
+
+        rcu_read_lock();
+        dev_maps = rcu_dereference(dev->xps_maps);
+        if (dev_maps) {
+                for_each_possible_cpu(i) {
+                        struct xps_map *map =
+                            rcu_dereference(dev_maps->cpu_map[i]);
+                        if (map) {
+                                int j;
+                                for (j = 0; j < map->len; j++) {
+                                        if (map->queues[j] == index) {
+                                                cpumask_set_cpu(i, mask);
+                                                break;
+                                        }
+                                }
+                        }
+                }
+        }
+        rcu_read_unlock();
+
+        len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
+        if (PAGE_SIZE - len < 3) {
+                free_cpumask_var(mask);
+                return -EINVAL;
+        }
+
+        free_cpumask_var(mask);
+        len += sprintf(buf + len, "\n");
+        return len;
+}
+
+static void xps_map_release(struct rcu_head *rcu)
+{
+        struct xps_map *map = container_of(rcu, struct xps_map, rcu);
+
+        kfree(map);
+}
+
+static void xps_dev_maps_release(struct rcu_head *rcu)
+{
+        struct xps_dev_maps *dev_maps =
+            container_of(rcu, struct xps_dev_maps, rcu);
+
+        kfree(dev_maps);
+}
+
+static DEFINE_MUTEX(xps_map_mutex);
+
+static ssize_t store_xps_map(struct netdev_queue *queue,
+                      struct netdev_queue_attribute *attribute,
+                      const char *buf, size_t len)
+{
+        struct net_device *dev = queue->dev;
+        cpumask_var_t mask;
+        int err, i, cpu, pos, map_len, alloc_len, need_set;
+        unsigned long index;
+        struct xps_map *map, *new_map;
+        struct xps_dev_maps *dev_maps, *new_dev_maps;
+        int nonempty = 0;
+
+        if (!capable(CAP_NET_ADMIN))
+                return -EPERM;
+
+        if (!alloc_cpumask_var(&mask, GFP_KERNEL))
+                return -ENOMEM;
+
+        index = get_netdev_queue_index(queue);
+
+        err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
+        if (err) {
+                free_cpumask_var(mask);
+                return err;
+        }
+
+        new_dev_maps = kzalloc(max_t(unsigned,
+            XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
+        if (!new_dev_maps) {
+                free_cpumask_var(mask);
+                return -ENOMEM;
+        }
+
+        mutex_lock(&xps_map_mutex);
+
+        dev_maps = dev->xps_maps;
+
+        for_each_possible_cpu(cpu) {
+                new_map = map = dev_maps ? dev_maps->cpu_map[cpu] : NULL;
+
+                if (map) {
+                        for (pos = 0; pos < map->len; pos++)
+                                if (map->queues[pos] == index)
+                                        break;
+                        map_len = map->len;
+                        alloc_len = map->alloc_len;
+                } else
+                        pos = map_len = alloc_len = 0;
+
+                need_set = cpu_isset(cpu, *mask) && cpu_online(cpu);
+
+                if (need_set && pos >= map_len) {
+                        /* Need to add queue to this CPU's map */
+                        if (map_len >= alloc_len) {
+                                alloc_len = alloc_len ?
+                                    2 * alloc_len : XPS_MIN_MAP_ALLOC;
+                                new_map = kzalloc(XPS_MAP_SIZE(alloc_len),
+                                    GFP_KERNEL);
+                                if (!new_map)
+                                        goto error;
+                                new_map->alloc_len = alloc_len;
+                                for (i = 0; i < map_len; i++)
+                                        new_map->queues[i] = map->queues[i];
+                                new_map->len = map_len;
+                        }
+                        new_map->queues[new_map->len++] = index;
+                } else if (!need_set && pos < map_len) {
+                        /* Need to remove queue from this CPU's map */
+                        if (map_len > 1)
+                                new_map->queues[pos] =
+                                    new_map->queues[--new_map->len];
+                        else
+                                new_map = NULL;
+                }
+                new_dev_maps->cpu_map[cpu] = new_map;
+        }
+
+        /* Cleanup old maps */
+        for_each_possible_cpu(cpu) {
+                map = dev_maps ? dev_maps->cpu_map[cpu] : NULL;
+                if (map && new_dev_maps->cpu_map[cpu] != map)
+                        call_rcu(&map->rcu, xps_map_release);
+                if (new_dev_maps->cpu_map[cpu])
+                        nonempty = 1;
+        }
+
+        if (nonempty)
+                rcu_assign_pointer(dev->xps_maps, new_dev_maps);
+        else {
+                kfree(new_dev_maps);
+                rcu_assign_pointer(dev->xps_maps, NULL);
+        }
+
+        if (dev_maps)
+                call_rcu(&dev_maps->rcu, xps_dev_maps_release);
+
+        mutex_unlock(&xps_map_mutex);
+
+        free_cpumask_var(mask);
+        return len;
+
+error:
+        mutex_unlock(&xps_map_mutex);
+
+        if (new_dev_maps)
+                for_each_possible_cpu(i)
+                        kfree(new_dev_maps->cpu_map[i]);
+        kfree(new_dev_maps);
+        free_cpumask_var(mask);
+        return -ENOMEM;
+}
+
+static struct netdev_queue_attribute xps_cpus_attribute =
+    __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
+
+static struct attribute *netdev_queue_default_attrs[] = {
+        &xps_cpus_attribute.attr,
+        NULL
+};
+
+static void netdev_queue_release(struct kobject *kobj)
+{
+        struct netdev_queue *queue = to_netdev_queue(kobj);
+        struct net_device *dev = queue->dev;
+        struct xps_dev_maps *dev_maps;
+        struct xps_map *map;
+        unsigned long index;
+        int i, pos, nonempty = 0;
+
+        index = get_netdev_queue_index(queue);
+
+        mutex_lock(&xps_map_mutex);
+        dev_maps = dev->xps_maps;
+
+        if (dev_maps) {
+                for_each_possible_cpu(i) {
+                        map  = dev_maps->cpu_map[i];
+                        if (!map)
+                                continue;
+
+                        for (pos = 0; pos < map->len; pos++)
+                                if (map->queues[pos] == index)
+                                        break;
+
+                        if (pos < map->len) {
+                                if (map->len > 1)
+                                        map->queues[pos] =
+                                            map->queues[--map->len];
+                                else {
+                                        RCU_INIT_POINTER(dev_maps->cpu_map[i],
+                                            NULL);
+                                        call_rcu(&map->rcu, xps_map_release);
+                                        map = NULL;
+                                }
+                        }
+                        if (map)
+                                nonempty = 1;
+                }
+
+                if (!nonempty) {
+                        RCU_INIT_POINTER(dev->xps_maps, NULL);
+                        call_rcu(&dev_maps->rcu, xps_dev_maps_release);
+                }
+        }
+
+        mutex_unlock(&xps_map_mutex);
+
+        memset(kobj, 0, sizeof(*kobj));
+        dev_put(queue->dev);
+}
+
+static struct kobj_type netdev_queue_ktype = {
+        .sysfs_ops = &netdev_queue_sysfs_ops,
+        .release = netdev_queue_release,
+        .default_attrs = netdev_queue_default_attrs,
+};
+
+static int netdev_queue_add_kobject(struct net_device *net, int index)
+{
+        struct netdev_queue *queue = net->_tx + index;
+        struct kobject *kobj = &queue->kobj;
+        int error = 0;
+
+        kobj->kset = net->queues_kset;
+        error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
+            "tx-%u", index);
+        if (error) {
+                kobject_put(kobj);
+                return error;
+        }
+
+        kobject_uevent(kobj, KOBJ_ADD);
+        dev_hold(queue->dev);
+
+        return error;
+}
+
+int
+netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
+{
+        int i;
+        int error = 0;
+
+        for (i = old_num; i < new_num; i++) {
+                error = netdev_queue_add_kobject(net, i);
+                if (error) {
+                        new_num = old_num;
+                        break;
+                }
+        }
+
+        while (--i >= new_num)
+                kobject_put(&net->_tx[i].kobj);
+
+        return error;
+}
+
+static int register_queue_kobjects(struct net_device *net)
+{
+        int error = 0, txq = 0, rxq = 0;
+
         net->queues_kset = kset_create_and_add("queues",
             NULL, &net->dev.kobj);
         if (!net->queues_kset)
                 return -ENOMEM;
-        return net_rx_queue_update_kobjects(net, 0, net->real_num_rx_queues);
+
+        error = net_rx_queue_update_kobjects(net, 0, net->real_num_rx_queues);
+        if (error)
+                goto error;
+        rxq = net->real_num_rx_queues;
+
+        error = netdev_queue_update_kobjects(net, 0,
+                                             net->real_num_tx_queues);
+        if (error)
+                goto error;
+        txq = net->real_num_tx_queues;
+
+        return 0;
+
+error:
+        netdev_queue_update_kobjects(net, txq, 0);
+        net_rx_queue_update_kobjects(net, rxq, 0);
+        return error;
 }
 
-static void rx_queue_remove_kobjects(struct net_device *net)
+static void remove_queue_kobjects(struct net_device *net)
 {
         net_rx_queue_update_kobjects(net, net->real_num_rx_queues, 0);
+        netdev_queue_update_kobjects(net, net->real_num_tx_queues, 0);
         kset_unregister(net->queues_kset);
 }
 #endif /* CONFIG_RPS */
@@ -886,7 +1245,7 @@ void netdev_unregister_kobject(struct net_device * net)
         kobject_get(&dev->kobj);
 
 #ifdef CONFIG_RPS
-        rx_queue_remove_kobjects(net);
+        remove_queue_kobjects(net);
 #endif
 
         device_del(dev);
@@ -927,7 +1286,7 @@ int netdev_register_kobject(struct net_device *net)
                 return error;
 
 #ifdef CONFIG_RPS
-        error = rx_queue_register_kobjects(net);
+        error = register_queue_kobjects(net);
         if (error) {
                 device_del(dev);
                 return error;