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Commit 16917b87 authored by Yuval Mintz's avatar Yuval Mintz Committed by David S. Miller
Browse files

net-next: Add netif_get_num_default_rss_queues 



Most multi-queue networking driver consider the number of online cpus when
configuring RSS queues.
This patch adds a wrapper to the number of cpus, setting an upper limit on the
number of cpus a driver should consider (by default) when allocating resources
for his queues.

Signed-off-by: default avatarYuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: default avatarEilon Greenstein <eilong@broadcom.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent bf5e53e3

include/linux/netdevice.h

+3 −0
Original line number Diff line number Diff line
@@ -2119,6 +2119,9 @@ static inline int netif_copy_real_num_queues(struct net_device *to_dev, 
#endif

}



#define DEFAULT_MAX_NUM_RSS_QUEUES	(8)

extern int netif_get_num_default_rss_queues(void);



/* Use this variant when it is known for sure that it

 * is executing from hardware interrupt context or with hardware interrupts

 * disabled.

net/core/dev.c

+11 −0
Original line number Diff line number Diff line
@@ -1793,6 +1793,17 @@ int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq) 
EXPORT_SYMBOL(netif_set_real_num_rx_queues);

#endif



/* netif_get_num_default_rss_queues - default number of RSS queues

 *

 * This routine should set an upper limit on the number of RSS queues

 * used by default by multiqueue devices.

 */

int netif_get_num_default_rss_queues()

{

	return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus());

}

EXPORT_SYMBOL(netif_get_num_default_rss_queues);



static inline void __netif_reschedule(struct Qdisc *q)

{

	struct softnet_data *sd;