[Intel-wired-lan] [PATCH 9/9] ixgbevf: add build_skb support
Emil Tantilov
emil.s.tantilov at intel.com
Wed Jan 31 00:51:54 UTC 2018
Add support for build_skb() similar to:
commit 6f429223b31c ("ixgbe: Add support for build_skb")
Signed-off-by: Emil Tantilov <emil.s.tantilov at intel.com>
---
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 41 +++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index cd8c0a0..74fcb4c 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);
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