@@ -528,7 +528,7 @@ static unsigned int refill_fl(struct adapter *adap, struct sge_fl *q, int n,
#endif
while (n--) {
- pg = alloc_page(gfp);
+ pg = __netdev_alloc_page(gfp, NULL);
if (unlikely(!pg)) {
q->alloc_failed++;
break;
@@ -653,7 +653,7 @@ static unsigned int refill_fl(struct adapter *adapter, struct sge_fl *fl,
alloc_small_pages:
while (n--) {
- page = alloc_page(gfp | __GFP_NOWARN | __GFP_COLD);
+ page = __netdev_alloc_page(gfp | __GFP_NOWARN, NULL);
if (unlikely(!page)) {
fl->alloc_failed++;
break;
@@ -6229,7 +6229,7 @@ static bool igb_alloc_mapped_page(struct igb_ring *rx_ring,
return true;
if (!page) {
- page = alloc_page(GFP_ATOMIC | __GFP_COLD);
+ page = __netdev_alloc_page(GFP_ATOMIC, bi->skb);
bi->page = page;
if (unlikely(!page)) {
rx_ring->rx_stats.alloc_failed++;
@@ -1126,7 +1126,7 @@ static bool ixgbe_alloc_mapped_page(struct ixgbe_ring *rx_ring,
/* alloc new page for storage */
if (likely(!page)) {
- page = alloc_pages(GFP_ATOMIC | __GFP_COLD,
+ page = __netdev_alloc_pages(GFP_ATOMIC, bi->skb,
ixgbe_rx_pg_order(rx_ring));
if (unlikely(!page)) {
rx_ring->rx_stats.alloc_rx_page_failed++;
@@ -369,7 +369,7 @@ static void ixgbevf_alloc_rx_buffers(struct ixgbevf_adapter *adapter,
if (!bi->page_dma &&
(adapter->flags & IXGBE_FLAG_RX_PS_ENABLED)) {
if (!bi->page) {
- bi->page = alloc_page(GFP_ATOMIC | __GFP_COLD);
+ bi->page = __netdev_alloc_page(GFP_ATOMIC, NULL);
if (!bi->page) {
adapter->alloc_rx_page_failed++;
goto no_buffers;
@@ -403,6 +403,7 @@ static void ixgbevf_alloc_rx_buffers(struct ixgbevf_adapter *adapter,
*/
skb_reserve(skb, NET_IP_ALIGN);
+ propagate_pfmemalloc_skb(bi->page_dma, skb);
bi->skb = skb;
}
if (!bi->dma) {
@@ -130,7 +130,7 @@ static int rx_submit(struct usbpn_dev *pnd, struct urb *req, gfp_t gfp_flags)
struct page *page;
int err;
- page = alloc_page(gfp_flags);
+ page = __netdev_alloc_page(gfp_flags | __GFP_NOMEMALLOC, NULL);
if (!page)
return -ENOMEM;
@@ -301,7 +301,7 @@ pn_rx_submit(struct f_phonet *fp, struct usb_request *req, gfp_t gfp_flags)
struct page *page;
int err;
- page = alloc_page(gfp_flags);
+ page = __netdev_alloc_page(gfp_flags | __GFP_NOMEMALLOC, NULL);
if (!page)
return -ENOMEM;
@@ -1747,6 +1747,61 @@ static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev,
return __netdev_alloc_skb_ip_align(dev, length, GFP_ATOMIC);
}
+/*
+ * __netdev_alloc_page - allocate a page for ps-rx on a specific device
+ * @gfp_mask: alloc_pages_node mask. Set __GFP_NOMEMALLOC if not for network packet RX
+ * @skb: skb to set pfmemalloc on if __GFP_MEMALLOC is used
+ * @order: size of the allocation
+ *
+ * Allocate a new page. dev currently unused.
+ *
+ * %NULL is returned if there is no free memory.
+*/
+static inline struct page *__netdev_alloc_pages(gfp_t gfp_mask,
+ struct sk_buff *skb,
+ unsigned int order)
+{
+ struct page *page;
+
+ gfp_mask |= __GFP_COLD;
+
+ if (!(gfp_mask & __GFP_NOMEMALLOC))
+ gfp_mask |= __GFP_MEMALLOC;
+
+ page = alloc_pages_node(NUMA_NO_NODE, gfp_mask, order);
+ if (skb && page && page->pfmemalloc)
+ skb->pfmemalloc = true;
+
+ return page;
+}
+
+/**
+ * __netdev_alloc_page - allocate a page for ps-rx on a specific device
+ * @gfp_mask: alloc_pages_node mask. Set __GFP_NOMEMALLOC if not for network packet RX
+ * @skb: skb to set pfmemalloc on if __GFP_MEMALLOC is used
+ *
+ * Allocate a new page. dev currently unused.
+ *
+ * %NULL is returned if there is no free memory.
+ */
+static inline struct page *__netdev_alloc_page(gfp_t gfp_mask,
+ struct sk_buff *skb)
+{
+ return __netdev_alloc_pages(gfp_mask, skb, 0);
+}
+
+/**
+ * propagate_pfmemalloc_skb - Propagate pfmemalloc if skb is allocated after RX page
+ * @page: The page that was allocated from netdev_alloc_page
+ * @skb: The skb that may need pfmemalloc set
+ */
+static inline void propagate_pfmemalloc_skb(struct page *page,
+ struct sk_buff *skb)
+{
+ if (page && page->pfmemalloc)
+ skb->pfmemalloc = true;
+}
+
/**
* skb_frag_page - retrieve the page refered to by a paged fragment
* @frag: the paged fragment
The skb->pfmemalloc flag gets set to true iff during the slab allocation of data in __alloc_skb that the the PFMEMALLOC reserves were used. If page splitting is used, it is possible that pages will be allocated from the PFMEMALLOC reserve without propagating this information to the skb. This patch propagates page->pfmemalloc from pages allocated for fragments to the skb. It works by reintroducing and expanding the netdev_alloc_page() API to take an skb. If the page was allocated from pfmemalloc reserves, it is automatically copied. If the driver allocates the page before the skb, it should call propagate_pfmemalloc_skb() after the skb is allocated to ensure the flag is copied properly. Failure to do so is not critical. The resulting driver may perform slower if it is used for swap-over-NBD or swap-over-NFS but it should not result in failure. Signed-off-by: Mel Gorman <mgorman@suse.de> --- drivers/net/ethernet/chelsio/cxgb4/sge.c | 2 +- drivers/net/ethernet/chelsio/cxgb4vf/sge.c | 2 +- drivers/net/ethernet/intel/igb/igb_main.c | 2 +- drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 2 +- drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 3 +- drivers/net/usb/cdc-phonet.c | 2 +- drivers/usb/gadget/f_phonet.c | 2 +- include/linux/skbuff.h | 55 +++++++++++++++++++++ 8 files changed, 63 insertions(+), 7 deletions(-)