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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2019-06-07 21:20:34 +0200
committerDavid S. Miller <davem@davemloft.net>2019-06-09 19:40:09 -0700
commit7ba7aeabbaba484347cc98fbe9045769ca0d118d (patch)
treec2123f1eb0e4dc2afd69ff392c858e551de5445d /net/core/skbuff.c
parent9e49fe4d6e17a38e8168effee181f001d2d22a5a (diff)
net: Don't disable interrupts in napi_alloc_frag()
netdev_alloc_frag() can be used from any context and is used by NAPI and non-NAPI drivers. Non-NAPI drivers use it in interrupt context and NAPI drivers use it during initial allocation (->ndo_open() or ->ndo_change_mtu()). Some NAPI drivers share the same function for the initial allocation and the allocation in their NAPI callback. The interrupts are disabled in order to ensure locked access from every context to `netdev_alloc_cache'. Let netdev_alloc_frag() check if interrupts are disabled. If they are, use `netdev_alloc_cache' otherwise disable BH and invoke __napi_alloc_frag() for the allocation. The IRQ check is cheaper compared to disabling & enabling interrupts and memory allocation with disabled interrupts does not work on -RT. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/skbuff.c')
-rw-r--r--net/core/skbuff.c49
1 files changed, 23 insertions, 26 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 23c9bf8fc322..ede23fa9bc5a 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -366,19 +366,21 @@ struct napi_alloc_cache {
static DEFINE_PER_CPU(struct page_frag_cache, netdev_alloc_cache);
static DEFINE_PER_CPU(struct napi_alloc_cache, napi_alloc_cache);
-static void *__netdev_alloc_frag(unsigned int fragsz, gfp_t gfp_mask)
+static void *__napi_alloc_frag(unsigned int fragsz, gfp_t gfp_mask)
{
- struct page_frag_cache *nc;
- unsigned long flags;
- void *data;
+ struct napi_alloc_cache *nc = this_cpu_ptr(&napi_alloc_cache);
- local_irq_save(flags);
- nc = this_cpu_ptr(&netdev_alloc_cache);
- data = page_frag_alloc(nc, fragsz, gfp_mask);
- local_irq_restore(flags);
- return data;
+ return page_frag_alloc(&nc->page, fragsz, gfp_mask);
}
+void *napi_alloc_frag(unsigned int fragsz)
+{
+ fragsz = SKB_DATA_ALIGN(fragsz);
+
+ return __napi_alloc_frag(fragsz, GFP_ATOMIC);
+}
+EXPORT_SYMBOL(napi_alloc_frag);
+
/**
* netdev_alloc_frag - allocate a page fragment
* @fragsz: fragment size
@@ -388,26 +390,21 @@ static void *__netdev_alloc_frag(unsigned int fragsz, gfp_t gfp_mask)
*/
void *netdev_alloc_frag(unsigned int fragsz)
{
- fragsz = SKB_DATA_ALIGN(fragsz);
-
- return __netdev_alloc_frag(fragsz, GFP_ATOMIC);
-}
-EXPORT_SYMBOL(netdev_alloc_frag);
-
-static void *__napi_alloc_frag(unsigned int fragsz, gfp_t gfp_mask)
-{
- struct napi_alloc_cache *nc = this_cpu_ptr(&napi_alloc_cache);
-
- return page_frag_alloc(&nc->page, fragsz, gfp_mask);
-}
+ struct page_frag_cache *nc;
+ void *data;
-void *napi_alloc_frag(unsigned int fragsz)
-{
fragsz = SKB_DATA_ALIGN(fragsz);
-
- return __napi_alloc_frag(fragsz, GFP_ATOMIC);
+ if (in_irq() || irqs_disabled()) {
+ nc = this_cpu_ptr(&netdev_alloc_cache);
+ data = page_frag_alloc(nc, fragsz, GFP_ATOMIC);
+ } else {
+ local_bh_disable();
+ data = __napi_alloc_frag(fragsz, GFP_ATOMIC);
+ local_bh_enable();
+ }
+ return data;
}
-EXPORT_SYMBOL(napi_alloc_frag);
+EXPORT_SYMBOL(netdev_alloc_frag);
/**
* __netdev_alloc_skb - allocate an skbuff for rx on a specific device