diff options
| author | Eric Dumazet <edumazet@google.com> | 2013-06-20 01:15:51 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-06-23 23:56:55 -0700 |
| commit | 60877a32bce00041528576e6b8df5abe9251fa73 (patch) | |
| tree | c949fd23e9a57d33a1597db4ad100ac2227fa19b /net | |
| parent | b0b02c77d7aa9ebeea5d4ea7e4f3fd745ad7f81c (diff) | |
| download | linux-60877a32bce00041528576e6b8df5abe9251fa73.tar.bz2 | |
net: allow large number of tx queues
netif_alloc_netdev_queues() uses kcalloc() to allocate memory
for the "struct netdev_queue *_tx" array.
For large number of tx queues, kcalloc() might fail, so this
patch does a fallback to vzalloc().
As vmalloc() adds overhead on a critical network path, add __GFP_REPEAT
to kzalloc() flags to do this fallback only when really needed.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/dev.c | 26 |
1 files changed, 19 insertions, 7 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index fa007dba6beb..722f633926e0 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -130,6 +130,7 @@ #include <linux/cpu_rmap.h> #include <linux/static_key.h> #include <linux/hashtable.h> +#include <linux/vmalloc.h> #include "net-sysfs.h" @@ -5253,17 +5254,28 @@ static void netdev_init_one_queue(struct net_device *dev, #endif } +static void netif_free_tx_queues(struct net_device *dev) +{ + if (is_vmalloc_addr(dev->_tx)) + vfree(dev->_tx); + else + kfree(dev->_tx); +} + static int netif_alloc_netdev_queues(struct net_device *dev) { unsigned int count = dev->num_tx_queues; struct netdev_queue *tx; + size_t sz = count * sizeof(*tx); - BUG_ON(count < 1); - - tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL); - if (!tx) - return -ENOMEM; + BUG_ON(count < 1 || count > 0xffff); + tx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); + if (!tx) { + tx = vzalloc(sz); + if (!tx) + return -ENOMEM; + } dev->_tx = tx; netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); @@ -5811,7 +5823,7 @@ free_all: free_pcpu: free_percpu(dev->pcpu_refcnt); - kfree(dev->_tx); + netif_free_tx_queues(dev); #ifdef CONFIG_RPS kfree(dev->_rx); #endif @@ -5836,7 +5848,7 @@ void free_netdev(struct net_device *dev) release_net(dev_net(dev)); - kfree(dev->_tx); + netif_free_tx_queues(dev); #ifdef CONFIG_RPS kfree(dev->_rx); #endif |