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net-sysfs: add support for device-specific rx queue sysfs attributes
Extend existing support for netdevice receive queue sysfs attributes to permit a device-specific attribute group. Initial use case for this support will be to allow the virtio-net device to export per-receive queue mergeable receive buffer size. Signed-off-by: Michael Dalton <mwdalton@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Dalton
David S. Miller
parent
ab7db91705
commit
a953be53ce
3 changed files with 66 additions and 31 deletions
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@ -668,15 +668,28 @@ extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
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bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id,
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u16 filter_id);
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#endif
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#endif /* CONFIG_RPS */
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/* This structure contains an instance of an RX queue. */
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struct netdev_rx_queue {
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#ifdef CONFIG_RPS
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struct rps_map __rcu *rps_map;
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struct rps_dev_flow_table __rcu *rps_flow_table;
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#endif
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struct kobject kobj;
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struct net_device *dev;
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} ____cacheline_aligned_in_smp;
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#endif /* CONFIG_RPS */
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/*
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* RX queue sysfs structures and functions.
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*/
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struct rx_queue_attribute {
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struct attribute attr;
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ssize_t (*show)(struct netdev_rx_queue *queue,
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struct rx_queue_attribute *attr, char *buf);
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ssize_t (*store)(struct netdev_rx_queue *queue,
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struct rx_queue_attribute *attr, const char *buf, size_t len);
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};
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#ifdef CONFIG_XPS
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/*
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@ -1313,7 +1326,7 @@ struct net_device {
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unicast) */
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#ifdef CONFIG_RPS
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#ifdef CONFIG_SYSFS
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struct netdev_rx_queue *_rx;
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/* Number of RX queues allocated at register_netdev() time */
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@ -1424,6 +1437,8 @@ struct net_device {
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struct device dev;
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/* space for optional device, statistics, and wireless sysfs groups */
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const struct attribute_group *sysfs_groups[4];
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/* space for optional per-rx queue attributes */
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const struct attribute_group *sysfs_rx_queue_group;
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/* rtnetlink link ops */
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const struct rtnl_link_ops *rtnl_link_ops;
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@ -2375,7 +2390,7 @@ static inline bool netif_is_multiqueue(const struct net_device *dev)
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int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq);
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#ifdef CONFIG_RPS
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#ifdef CONFIG_SYSFS
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int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq);
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#else
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static inline int netif_set_real_num_rx_queues(struct net_device *dev,
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@ -2394,7 +2409,7 @@ static inline int netif_copy_real_num_queues(struct net_device *to_dev,
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from_dev->real_num_tx_queues);
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if (err)
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return err;
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#ifdef CONFIG_RPS
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#ifdef CONFIG_SYSFS
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return netif_set_real_num_rx_queues(to_dev,
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from_dev->real_num_rx_queues);
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#else
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@ -2402,6 +2417,18 @@ static inline int netif_copy_real_num_queues(struct net_device *to_dev,
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#endif
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}
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#ifdef CONFIG_SYSFS
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static inline unsigned int get_netdev_rx_queue_index(
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struct netdev_rx_queue *queue)
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{
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struct net_device *dev = queue->dev;
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int index = queue - dev->_rx;
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BUG_ON(index >= dev->num_rx_queues);
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return index;
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}
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#endif
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#define DEFAULT_MAX_NUM_RSS_QUEUES (8)
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int netif_get_num_default_rss_queues(void);
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@ -2083,7 +2083,7 @@ int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
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}
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EXPORT_SYMBOL(netif_set_real_num_tx_queues);
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#ifdef CONFIG_RPS
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#ifdef CONFIG_SYSFS
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/**
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* netif_set_real_num_rx_queues - set actual number of RX queues used
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* @dev: Network device
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@ -5764,7 +5764,7 @@ void netif_stacked_transfer_operstate(const struct net_device *rootdev,
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}
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EXPORT_SYMBOL(netif_stacked_transfer_operstate);
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#ifdef CONFIG_RPS
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#ifdef CONFIG_SYSFS
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static int netif_alloc_rx_queues(struct net_device *dev)
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{
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unsigned int i, count = dev->num_rx_queues;
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@ -6309,7 +6309,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
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return NULL;
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}
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#ifdef CONFIG_RPS
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#ifdef CONFIG_SYSFS
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if (rxqs < 1) {
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pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
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return NULL;
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@ -6365,7 +6365,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
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if (netif_alloc_netdev_queues(dev))
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goto free_all;
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#ifdef CONFIG_RPS
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#ifdef CONFIG_SYSFS
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dev->num_rx_queues = rxqs;
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dev->real_num_rx_queues = rxqs;
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if (netif_alloc_rx_queues(dev))
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@ -6385,7 +6385,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
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free_pcpu:
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free_percpu(dev->pcpu_refcnt);
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netif_free_tx_queues(dev);
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#ifdef CONFIG_RPS
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#ifdef CONFIG_SYSFS
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kfree(dev->_rx);
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#endif
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@ -6410,7 +6410,7 @@ void free_netdev(struct net_device *dev)
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release_net(dev_net(dev));
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netif_free_tx_queues(dev);
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#ifdef CONFIG_RPS
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#ifdef CONFIG_SYSFS
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kfree(dev->_rx);
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#endif
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@ -498,17 +498,7 @@ static struct attribute_group wireless_group = {
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#define net_class_groups NULL
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#endif /* CONFIG_SYSFS */
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#ifdef CONFIG_RPS
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/*
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* RX queue sysfs structures and functions.
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*/
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struct rx_queue_attribute {
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struct attribute attr;
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ssize_t (*show)(struct netdev_rx_queue *queue,
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struct rx_queue_attribute *attr, char *buf);
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ssize_t (*store)(struct netdev_rx_queue *queue,
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struct rx_queue_attribute *attr, const char *buf, size_t len);
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};
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#ifdef CONFIG_SYSFS
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#define to_rx_queue_attr(_attr) container_of(_attr, \
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struct rx_queue_attribute, attr)
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@ -543,6 +533,7 @@ static const struct sysfs_ops rx_queue_sysfs_ops = {
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.store = rx_queue_attr_store,
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};
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#ifdef CONFIG_RPS
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static ssize_t show_rps_map(struct netdev_rx_queue *queue,
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struct rx_queue_attribute *attribute, char *buf)
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{
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@ -718,16 +709,20 @@ static struct rx_queue_attribute rps_cpus_attribute =
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static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
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__ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
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show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
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#endif /* CONFIG_RPS */
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static struct attribute *rx_queue_default_attrs[] = {
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#ifdef CONFIG_RPS
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&rps_cpus_attribute.attr,
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&rps_dev_flow_table_cnt_attribute.attr,
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#endif
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NULL
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};
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static void rx_queue_release(struct kobject *kobj)
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{
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struct netdev_rx_queue *queue = to_rx_queue(kobj);
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#ifdef CONFIG_RPS
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struct rps_map *map;
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struct rps_dev_flow_table *flow_table;
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@ -743,6 +738,7 @@ static void rx_queue_release(struct kobject *kobj)
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RCU_INIT_POINTER(queue->rps_flow_table, NULL);
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call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
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}
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#endif
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memset(kobj, 0, sizeof(*kobj));
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dev_put(queue->dev);
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@ -763,25 +759,36 @@ static int rx_queue_add_kobject(struct net_device *net, int index)
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kobj->kset = net->queues_kset;
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error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
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"rx-%u", index);
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if (error) {
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kobject_put(kobj);
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return error;
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if (error)
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goto exit;
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if (net->sysfs_rx_queue_group) {
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error = sysfs_create_group(kobj, net->sysfs_rx_queue_group);
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if (error)
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goto exit;
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}
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kobject_uevent(kobj, KOBJ_ADD);
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dev_hold(queue->dev);
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return error;
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exit:
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kobject_put(kobj);
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return error;
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}
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#endif /* CONFIG_RPS */
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#endif /* CONFIG_SYFS */
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int
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net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
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{
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#ifdef CONFIG_RPS
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#ifdef CONFIG_SYSFS
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int i;
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int error = 0;
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#ifndef CONFIG_RPS
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if (!net->sysfs_rx_queue_group)
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return 0;
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#endif
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for (i = old_num; i < new_num; i++) {
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error = rx_queue_add_kobject(net, i);
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if (error) {
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@ -790,8 +797,12 @@ net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
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}
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}
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while (--i >= new_num)
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while (--i >= new_num) {
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if (net->sysfs_rx_queue_group)
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sysfs_remove_group(&net->_rx[i].kobj,
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net->sysfs_rx_queue_group);
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kobject_put(&net->_rx[i].kobj);
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}
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return error;
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#else
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@ -1155,9 +1166,6 @@ static int register_queue_kobjects(struct net_device *net)
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NULL, &net->dev.kobj);
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if (!net->queues_kset)
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return -ENOMEM;
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#endif
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#ifdef CONFIG_RPS
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real_rx = net->real_num_rx_queues;
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#endif
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real_tx = net->real_num_tx_queues;
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@ -1184,7 +1192,7 @@ static void remove_queue_kobjects(struct net_device *net)
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{
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int real_rx = 0, real_tx = 0;
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#ifdef CONFIG_RPS
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#ifdef CONFIG_SYSFS
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real_rx = net->real_num_rx_queues;
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#endif
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real_tx = net->real_num_tx_queues;
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