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>

diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index faeb426..cb94318 100644 (file)
--- 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);