Commit a953be53 authored by Michael Dalton's avatar Michael Dalton Committed by David S. Miller
Browse files

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: default avatarMichael Dalton <mwdalton@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ab7db917

include/linux/netdevice.h

+31 −4
Original line number Diff line number Diff line
@@ -668,15 +668,28 @@ extern struct rps_sock_flow_table __rcu *rps_sock_flow_table; 
bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id,

			 u16 filter_id);

#endif

#endif /* CONFIG_RPS */



/* This structure contains an instance of an RX queue. */

struct netdev_rx_queue {

#ifdef CONFIG_RPS

	struct rps_map __rcu		*rps_map;

	struct rps_dev_flow_table __rcu	*rps_flow_table;

#endif

	struct kobject			kobj;

	struct net_device		*dev;

} ____cacheline_aligned_in_smp;

#endif /* CONFIG_RPS */



/*

 * RX queue sysfs structures and functions.

 */

struct rx_queue_attribute {

	struct attribute attr;

	ssize_t (*show)(struct netdev_rx_queue *queue,

	    struct rx_queue_attribute *attr, char *buf);

	ssize_t (*store)(struct netdev_rx_queue *queue,

	    struct rx_queue_attribute *attr, const char *buf, size_t len);

};



#ifdef CONFIG_XPS

/*
@@ -1313,7 +1326,7 @@ struct net_device { 
						   unicast) */





#ifdef CONFIG_RPS

#ifdef CONFIG_SYSFS

	struct netdev_rx_queue	*_rx;



	/* Number of RX queues allocated at register_netdev() time */
@@ -1424,6 +1437,8 @@ struct net_device { 
	struct device		dev;

	/* space for optional device, statistics, and wireless sysfs groups */

	const struct attribute_group *sysfs_groups[4];

	/* space for optional per-rx queue attributes */

	const struct attribute_group *sysfs_rx_queue_group;



	/* rtnetlink link ops */

	const struct rtnl_link_ops *rtnl_link_ops;
@@ -2375,7 +2390,7 @@ static inline bool netif_is_multiqueue(const struct net_device *dev) 


int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq);



#ifdef CONFIG_RPS

#ifdef CONFIG_SYSFS

int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq);

#else

static inline int netif_set_real_num_rx_queues(struct net_device *dev,
@@ -2394,7 +2409,7 @@ static inline int netif_copy_real_num_queues(struct net_device *to_dev, 
					   from_dev->real_num_tx_queues);

	if (err)

		return err;

#ifdef CONFIG_RPS

#ifdef CONFIG_SYSFS

	return netif_set_real_num_rx_queues(to_dev,

					    from_dev->real_num_rx_queues);

#else
@@ -2402,6 +2417,18 @@ static inline int netif_copy_real_num_queues(struct net_device *to_dev, 
#endif

}



#ifdef CONFIG_SYSFS

static inline unsigned int get_netdev_rx_queue_index(

		struct netdev_rx_queue *queue)

{

	struct net_device *dev = queue->dev;

	int index = queue - dev->_rx;



	BUG_ON(index >= dev->num_rx_queues);

	return index;

}

#endif



#define DEFAULT_MAX_NUM_RSS_QUEUES	(8)

int netif_get_num_default_rss_queues(void);

net/core/dev.c

+6 −6
Original line number Diff line number Diff line
@@ -2083,7 +2083,7 @@ int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq) 
}

EXPORT_SYMBOL(netif_set_real_num_tx_queues);



#ifdef CONFIG_RPS

#ifdef CONFIG_SYSFS

/**

 *	netif_set_real_num_rx_queues - set actual number of RX queues used

 *	@dev: Network device
@@ -5764,7 +5764,7 @@ void netif_stacked_transfer_operstate(const struct net_device *rootdev, 
}

EXPORT_SYMBOL(netif_stacked_transfer_operstate);



#ifdef CONFIG_RPS

#ifdef CONFIG_SYSFS

static int netif_alloc_rx_queues(struct net_device *dev)

{

	unsigned int i, count = dev->num_rx_queues;
@@ -6309,7 +6309,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, 
		return NULL;

	}



#ifdef CONFIG_RPS

#ifdef CONFIG_SYSFS

	if (rxqs < 1) {

		pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");

		return NULL;
@@ -6365,7 +6365,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, 
	if (netif_alloc_netdev_queues(dev))

		goto free_all;



#ifdef CONFIG_RPS

#ifdef CONFIG_SYSFS

	dev->num_rx_queues = rxqs;

	dev->real_num_rx_queues = rxqs;

	if (netif_alloc_rx_queues(dev))
@@ -6385,7 +6385,7 @@ free_all: 
free_pcpu:

	free_percpu(dev->pcpu_refcnt);

	netif_free_tx_queues(dev);

#ifdef CONFIG_RPS

#ifdef CONFIG_SYSFS

	kfree(dev->_rx);

#endif
@@ -6410,7 +6410,7 @@ void free_netdev(struct net_device *dev) 
	release_net(dev_net(dev));



	netif_free_tx_queues(dev);

#ifdef CONFIG_RPS

#ifdef CONFIG_SYSFS

	kfree(dev->_rx);

#endif

net/core/net-sysfs.c

+29 −21
Original line number Diff line number Diff line
@@ -498,17 +498,7 @@ static struct attribute_group wireless_group = { 
#define net_class_groups	NULL

#endif /* CONFIG_SYSFS */



#ifdef CONFIG_RPS

/*

 * RX queue sysfs structures and functions.

 */

struct rx_queue_attribute {

	struct attribute attr;

	ssize_t (*show)(struct netdev_rx_queue *queue,

	    struct rx_queue_attribute *attr, char *buf);

	ssize_t (*store)(struct netdev_rx_queue *queue,

	    struct rx_queue_attribute *attr, const char *buf, size_t len);

};

#ifdef CONFIG_SYSFS

#define to_rx_queue_attr(_attr) container_of(_attr,		\

    struct rx_queue_attribute, attr)
@@ -543,6 +533,7 @@ static const struct sysfs_ops rx_queue_sysfs_ops = { 
	.store = rx_queue_attr_store,

};



#ifdef CONFIG_RPS

static ssize_t show_rps_map(struct netdev_rx_queue *queue,

			    struct rx_queue_attribute *attribute, char *buf)

{
@@ -718,16 +709,20 @@ static struct rx_queue_attribute rps_cpus_attribute = 
static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =

	__ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,

	    show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);

#endif /* CONFIG_RPS */



static struct attribute *rx_queue_default_attrs[] = {

#ifdef CONFIG_RPS

	&rps_cpus_attribute.attr,

	&rps_dev_flow_table_cnt_attribute.attr,

#endif

	NULL

};



static void rx_queue_release(struct kobject *kobj)

{

	struct netdev_rx_queue *queue = to_rx_queue(kobj);

#ifdef CONFIG_RPS

	struct rps_map *map;

	struct rps_dev_flow_table *flow_table;
@@ -743,6 +738,7 @@ static void rx_queue_release(struct kobject *kobj) 
		RCU_INIT_POINTER(queue->rps_flow_table, NULL);

		call_rcu(&flow_table->rcu, rps_dev_flow_table_release);

	}

#endif



	memset(kobj, 0, sizeof(*kobj));

	dev_put(queue->dev);
@@ -763,25 +759,36 @@ static int rx_queue_add_kobject(struct net_device *net, int index) 
	kobj->kset = net->queues_kset;

	error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,

	    "rx-%u", index);

	if (error) {

		kobject_put(kobj);

		return error;

	if (error)

		goto exit;



	if (net->sysfs_rx_queue_group) {

		error = sysfs_create_group(kobj, net->sysfs_rx_queue_group);

		if (error)

			goto exit;

	}



	kobject_uevent(kobj, KOBJ_ADD);

	dev_hold(queue->dev);



	return error;

exit:

	kobject_put(kobj);

	return error;

}

#endif /* CONFIG_RPS */

#endif /* CONFIG_SYFS */



int

net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)

{

#ifdef CONFIG_RPS

#ifdef CONFIG_SYSFS

	int i;

	int error = 0;



#ifndef CONFIG_RPS

	if (!net->sysfs_rx_queue_group)

		return 0;

#endif

	for (i = old_num; i < new_num; i++) {

		error = rx_queue_add_kobject(net, i);

		if (error) {
@@ -790,8 +797,12 @@ net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num) 
		}

	}



	while (--i >= new_num)

	while (--i >= new_num) {

		if (net->sysfs_rx_queue_group)

			sysfs_remove_group(&net->_rx[i].kobj,

					   net->sysfs_rx_queue_group);

		kobject_put(&net->_rx[i].kobj);

	}



	return error;

#else
@@ -1155,9 +1166,6 @@ static int register_queue_kobjects(struct net_device *net) 
	    NULL, &net->dev.kobj);

	if (!net->queues_kset)

		return -ENOMEM;

#endif



#ifdef CONFIG_RPS

	real_rx = net->real_num_rx_queues;

#endif

	real_tx = net->real_num_tx_queues;
@@ -1184,7 +1192,7 @@ static void remove_queue_kobjects(struct net_device *net) 
{

	int real_rx = 0, real_tx = 0;



#ifdef CONFIG_RPS

#ifdef CONFIG_SYSFS

	real_rx = net->real_num_rx_queues;

#endif

	real_tx = net->real_num_tx_queues;

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