2 files changed, 4 insertions, 114 deletions

diff --git a/drivers/net/ethernet/intel/igb/igb.h b/drivers/net/ethernet/intel/igb/igb.h
index 25151401c2ab..ab577a763a20 100644
--- a/drivers/net/ethernet/intel/igb/igb.h
+++ b/drivers/net/ethernet/intel/igb/igb.h
@@ -284,18 +284,10 @@ struct igb_q_vector {
 enum e1000_ring_flags_t {
 	IGB_RING_FLAG_RX_SCTP_CSUM,
 	IGB_RING_FLAG_RX_LB_VLAN_BSWAP,
-	IGB_RING_FLAG_RX_BUILD_SKB_ENABLED,
 	IGB_RING_FLAG_TX_CTX_IDX,
 	IGB_RING_FLAG_TX_DETECT_HANG
 };
 
-#define ring_uses_build_skb(ring) \
-	test_bit(IGB_RING_FLAG_RX_BUILD_SKB_ENABLED, &(ring)->flags)
-#define set_ring_build_skb_enabled(ring) \
-	set_bit(IGB_RING_FLAG_RX_BUILD_SKB_ENABLED, &(ring)->flags)
-#define clear_ring_build_skb_enabled(ring) \
-	clear_bit(IGB_RING_FLAG_RX_BUILD_SKB_ENABLED, &(ring)->flags)
-
 #define IGB_TXD_DCMD (E1000_ADVTXD_DCMD_EOP | E1000_ADVTXD_DCMD_RS)
 
 #define IGB_RX_DESC(R, i)	    \
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 8496adfc6a68..64f75291e3a5 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -3350,20 +3350,6 @@ void igb_configure_rx_ring(struct igb_adapter *adapter,
 	wr32(E1000_RXDCTL(reg_idx), rxdctl);
 }
 
-static void igb_set_rx_buffer_len(struct igb_adapter *adapter,
-				  struct igb_ring *rx_ring)
-{
-#define IGB_MAX_BUILD_SKB_SIZE \
-	(SKB_WITH_OVERHEAD(IGB_RX_BUFSZ) - \
-	 (NET_SKB_PAD + NET_IP_ALIGN + IGB_TS_HDR_LEN))
-
-	/* set build_skb flag */
-	if (adapter->max_frame_size <= IGB_MAX_BUILD_SKB_SIZE)
-		set_ring_build_skb_enabled(rx_ring);
-	else
-		clear_ring_build_skb_enabled(rx_ring);
-}
-
 /**
  * igb_configure_rx - Configure receive Unit after Reset
  * @adapter: board private structure
@@ -3383,11 +3369,8 @@ static void igb_configure_rx(struct igb_adapter *adapter)
 
 	/* Setup the HW Rx Head and Tail Descriptor Pointers and
 	 * the Base and Length of the Rx Descriptor Ring */
-	for (i = 0; i < adapter->num_rx_queues; i++) {
-		struct igb_ring *rx_ring = adapter->rx_ring[i];
-		igb_set_rx_buffer_len(adapter, rx_ring);
-		igb_configure_rx_ring(adapter, rx_ring);
-	}
+	for (i = 0; i < adapter->num_rx_queues; i++)
+		igb_configure_rx_ring(adapter, adapter->rx_ring[i]);
 }
 
 /**
@@ -6203,78 +6186,6 @@ static bool igb_add_rx_frag(struct igb_ring *rx_ring,
 	return igb_can_reuse_rx_page(rx_buffer, page, truesize);
 }
 
-static struct sk_buff *igb_build_rx_buffer(struct igb_ring *rx_ring,
-					   union e1000_adv_rx_desc *rx_desc)
-{
-	struct igb_rx_buffer *rx_buffer;
-	struct sk_buff *skb;
-	struct page *page;
-	void *page_addr;
-	unsigned int size = le16_to_cpu(rx_desc->wb.upper.length);
-#if (PAGE_SIZE < 8192)
-	unsigned int truesize = IGB_RX_BUFSZ;
-#else
-	unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) +
-				SKB_DATA_ALIGN(NET_SKB_PAD +
-					       NET_IP_ALIGN +
-					       size);
-#endif
-
-	/* If we spanned a buffer we have a huge mess so test for it */
-	BUG_ON(unlikely(!igb_test_staterr(rx_desc, E1000_RXD_STAT_EOP)));
-
-	rx_buffer = &rx_ring->rx_buffer_info[rx_ring->next_to_clean];
-	page = rx_buffer->page;
-	prefetchw(page);
-
-	page_addr = page_address(page) + rx_buffer->page_offset;
-
-	/* prefetch first cache line of first page */
-	prefetch(page_addr + NET_SKB_PAD + NET_IP_ALIGN);
-#if L1_CACHE_BYTES < 128
-	prefetch(page_addr + L1_CACHE_BYTES + NET_SKB_PAD + NET_IP_ALIGN);
-#endif
-
-	/* build an skb to around the page buffer */
-	skb = build_skb(page_addr, truesize);
-	if (unlikely(!skb)) {
-		rx_ring->rx_stats.alloc_failed++;
-		return NULL;
-	}
-
-	/* we are reusing so sync this buffer for CPU use */
-	dma_sync_single_range_for_cpu(rx_ring->dev,
-				      rx_buffer->dma,
-				      rx_buffer->page_offset,
-				      IGB_RX_BUFSZ,
-				      DMA_FROM_DEVICE);
-
-	/* update pointers within the skb to store the data */
-	skb_reserve(skb, NET_IP_ALIGN + NET_SKB_PAD);
-	__skb_put(skb, size);
-
-	/* pull timestamp out of packet data */
-	if (igb_test_staterr(rx_desc, E1000_RXDADV_STAT_TSIP)) {
-		igb_ptp_rx_pktstamp(rx_ring->q_vector, skb->data, skb);
-		__skb_pull(skb, IGB_TS_HDR_LEN);
-	}
-
-	if (igb_can_reuse_rx_page(rx_buffer, page, truesize)) {
-		/* hand second half of page back to the ring */
-		igb_reuse_rx_page(rx_ring, rx_buffer);
-	} else {
-		/* we are not reusing the buffer so unmap it */
-		dma_unmap_page(rx_ring->dev, rx_buffer->dma,
-			       PAGE_SIZE, DMA_FROM_DEVICE);
-	}
-
-	/* clear contents of buffer_info */
-	rx_buffer->dma = 0;
-	rx_buffer->page = NULL;
-
-	return skb;
-}
-
 static struct sk_buff *igb_fetch_rx_buffer(struct igb_ring *rx_ring,
 					   union e1000_adv_rx_desc *rx_desc,
 					   struct sk_buff *skb)
@@ -6690,10 +6601,7 @@ static bool igb_clean_rx_irq(struct igb_q_vector *q_vector, const int budget)
 		rmb();
 
 		/* retrieve a buffer from the ring */
-		if (ring_uses_build_skb(rx_ring))
-			skb = igb_build_rx_buffer(rx_ring, rx_desc);
-		else
-			skb = igb_fetch_rx_buffer(rx_ring, rx_desc, skb);
+		skb = igb_fetch_rx_buffer(rx_ring, rx_desc, skb);
 
 		/* exit if we failed to retrieve a buffer */
 		if (!skb)
@@ -6780,14 +6688,6 @@ static bool igb_alloc_mapped_page(struct igb_ring *rx_ring,
 	return true;
 }
 
-static inline unsigned int igb_rx_offset(struct igb_ring *rx_ring)
-{
-	if (ring_uses_build_skb(rx_ring))
-		return NET_SKB_PAD + NET_IP_ALIGN;
-	else
-		return 0;
-}
-
 /**
  * igb_alloc_rx_buffers - Replace used receive buffers; packet split
  * @adapter: address of board private structure
@@ -6814,9 +6714,7 @@ void igb_alloc_rx_buffers(struct igb_ring *rx_ring, u16 cleaned_count)
 		 * Refresh the desc even if buffer_addrs didn't change
 		 * because each write-back erases this info.
 		 */
-		rx_desc->read.pkt_addr = cpu_to_le64(bi->dma +
-						     bi->page_offset +
-						     igb_rx_offset(rx_ring));
+		rx_desc->read.pkt_addr = cpu_to_le64(bi->dma + bi->page_offset);
 
 		rx_desc++;
 		bi++;