[Intel-wired-lan] [next PATCH v2 10/11] ixgbe: Add support for build_skb
Alexander Duyck
alexander.duyck at gmail.com
Tue Jan 17 16:37:13 UTC 2017
From: Alexander Duyck <alexander.h.duyck at intel.com>
This patch adds build_skb support to the Rx path. There are several
advantages to this change.
1. It avoids the memcpy and skb->head allocation for small packets which
improves performance by about 5% in my tests.
2. It avoids the memcpy, skb->head allocation, and eth_get_headlen
for larger packets improving performance by about 10% in my tests.
3. For VXLAN packets it allows the full header to be in skb->data which
improves the performance by as much as 30% in some of my tests.
Signed-off-by: Alexander Duyck <alexander.h.duyck at intel.com>
---
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 49 ++++++++++++++++++++++++-
1 file changed, 48 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 8529eafb9717..dd04b76ae0bd 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -1913,7 +1913,7 @@ static bool ixgbe_cleanup_headers(struct ixgbe_ring *rx_ring,
}
/* place header in linear portion of buffer */
- if (skb_is_nonlinear(skb))
+ if (!skb_headlen(skb))
ixgbe_pull_tail(rx_ring, skb);
#ifdef IXGBE_FCOE
@@ -2142,6 +2142,49 @@ static struct sk_buff *ixgbe_construct_skb(struct ixgbe_ring *rx_ring,
return skb;
}
+static struct sk_buff *ixgbe_build_skb(struct ixgbe_ring *rx_ring,
+ struct ixgbe_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 = ixgbe_rx_pg_size(rx_ring) / 2;
+#else
+ unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) +
+ SKB_DATA_ALIGN(IXGBE_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 - IXGBE_SKB_PAD, truesize);
+ if (unlikely(!skb))
+ return NULL;
+
+ /* update pointers within the skb to store the data */
+ skb_reserve(skb, IXGBE_SKB_PAD);
+ __skb_put(skb, size);
+
+ /* record DMA address if this is the start of a chain of buffers */
+ if (!ixgbe_test_staterr(rx_desc, IXGBE_RXD_STAT_EOP))
+ IXGBE_CB(skb)->dma = rx_buffer->dma;
+
+ /* update buffer offset */
+#if (PAGE_SIZE < 8192)
+ rx_buffer->page_offset ^= truesize;
+#else
+ rx_buffer->page_offset += truesize;
+#endif
+
+ return skb;
+}
+
/**
* ixgbe_clean_rx_irq - Clean completed descriptors from Rx ring - bounce buf
* @q_vector: structure containing interrupt and ring information
@@ -2195,6 +2238,9 @@ static int ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
/* retrieve a buffer from the ring */
if (skb)
ixgbe_add_rx_frag(rx_ring, rx_buffer, skb, size);
+ else if (ring_uses_build_skb(rx_ring))
+ skb = ixgbe_build_skb(rx_ring, rx_buffer,
+ rx_desc, size);
else
skb = ixgbe_construct_skb(rx_ring, rx_buffer,
rx_desc, size);
@@ -3970,6 +4016,7 @@ static void ixgbe_set_rx_buffer_len(struct ixgbe_adapter *adapter)
if (test_bit(__IXGBE_RX_FCOE, &rx_ring->state))
set_bit(__IXGBE_RX_3K_BUFFER, &rx_ring->state);
+ clear_bit(__IXGBE_RX_BUILD_SKB_ENABLED, &rx_ring->state);
if (adapter->flags2 & IXGBE_FLAG2_RX_LEGACY)
continue;
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