ixgbevf: add build_skb support

Add support for build_skb() similar to:
commit 6f429223b31c ("ixgbe: Add support for build_skb")

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Krishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index faeb426c2f0f..cb943187816f 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -910,6 +910,44 @@ static inline void ixgbevf_irq_enable_queues(struct ixgbevf_adapter *adapter,
         IXGBE_WRITE_REG(hw, IXGBE_VTEIMS, qmask);
 }
 
+static struct sk_buff *ixgbevf_build_skb(struct ixgbevf_ring *rx_ring,
+                                         struct ixgbevf_rx_buffer *rx_buffer,
+                                         union ixgbe_adv_rx_desc *rx_desc,
+                                         unsigned int size)
+{
+        void *va = page_address(rx_buffer->page) + rx_buffer->page_offset;
+#if (PAGE_SIZE < 8192)
+        unsigned int truesize = ixgbevf_rx_pg_size(rx_ring) / 2;
+#else
+        unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) +
+                                SKB_DATA_ALIGN(IXGBEVF_SKB_PAD + size);
+#endif
+        struct sk_buff *skb;
+
+        /* prefetch first cache line of first page */
+        prefetch(va);
+#if L1_CACHE_BYTES < 128
+        prefetch(va + L1_CACHE_BYTES);
+#endif
+
+        /* build an skb to around the page buffer */
+        skb = build_skb(va - IXGBEVF_SKB_PAD, truesize);
+        if (unlikely(!skb))
+                return NULL;
+
+        /* update pointers within the skb to store the data */
+        skb_reserve(skb, IXGBEVF_SKB_PAD);
+        __skb_put(skb, size);
+
+        /* update buffer offset */
+#if (PAGE_SIZE < 8192)
+        rx_buffer->page_offset ^= truesize;
+#else
+        rx_buffer->page_offset += truesize;
+#endif
+
+        return skb;
+}
 static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
                                 struct ixgbevf_ring *rx_ring,
                                 int budget)
@@ -945,6 +983,9 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
                 /* retrieve a buffer from the ring */
                 if (skb)
                         ixgbevf_add_rx_frag(rx_ring, rx_buffer, skb, size);
+                else if (ring_uses_build_skb(rx_ring))
+                        skb = ixgbevf_build_skb(rx_ring, rx_buffer,
+                                                rx_desc, size);
                 else
                         skb = ixgbevf_construct_skb(rx_ring, rx_buffer,
                                                     rx_desc, size);