ixgbevf: improve performance and reduce size of ixgbevf_tx_map()

Based on commit ec718254cbfe
("ixgbe: Improve performance and reduce size of ixgbe_tx_map")

This change is meant to both improve the performance and reduce the size of
ixgbevf_tx_map().

Expand the work done in the main loop by pushing first into tx_buffer.
This allows us to pull in the dma_mapping_error check, the tx_buffer value
assignment, and the initial DMA value assignment to the Tx descriptor.

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>

drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c

@@ -3532,34 +3532,37 @@ static void ixgbevf_tx_map(struct ixgbevf_ring *tx_ring,
 			   struct ixgbevf_tx_buffer *first,
 			   const u8 hdr_len)
 {
-	dma_addr_t dma;
 	struct sk_buff *skb = first->skb;
 	struct ixgbevf_tx_buffer *tx_buffer;
 	union ixgbe_adv_tx_desc *tx_desc;
-	struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[0];
-	unsigned int data_len = skb->data_len;
-	unsigned int size = skb_headlen(skb);
-	unsigned int paylen = skb->len - hdr_len;
+	struct skb_frag_struct *frag;
+	dma_addr_t dma;
+	unsigned int data_len, size;
 	u32 tx_flags = first->tx_flags;
-	__le32 cmd_type;
+	__le32 cmd_type = ixgbevf_tx_cmd_type(tx_flags);
 	u16 i = tx_ring->next_to_use;
 
 	tx_desc = IXGBEVF_TX_DESC(tx_ring, i);
 
-	ixgbevf_tx_olinfo_status(tx_desc, tx_flags, paylen);
-	cmd_type = ixgbevf_tx_cmd_type(tx_flags);
+	ixgbevf_tx_olinfo_status(tx_desc, tx_flags, skb->len - hdr_len);
+
+	size = skb_headlen(skb);
+	data_len = skb->data_len;
 
 	dma = dma_map_single(tx_ring->dev, skb->data, size, DMA_TO_DEVICE);
-	if (dma_mapping_error(tx_ring->dev, dma))
-		goto dma_error;
 
-	/* record length, and DMA address */
-	dma_unmap_len_set(first, len, size);
-	dma_unmap_addr_set(first, dma, dma);
+	tx_buffer = first;
 
-	tx_desc->read.buffer_addr = cpu_to_le64(dma);
+	for (frag = &skb_shinfo(skb)->frags[0];; frag++) {
+		if (dma_mapping_error(tx_ring->dev, dma))
+			goto dma_error;
+
+		/* record length, and DMA address */
+		dma_unmap_len_set(tx_buffer, len, size);
+		dma_unmap_addr_set(tx_buffer, dma, dma);
+
+		tx_desc->read.buffer_addr = cpu_to_le64(dma);
 
-	for (;;) {
 		while (unlikely(size > IXGBE_MAX_DATA_PER_TXD)) {
 			tx_desc->read.cmd_type_len =
 				cmd_type | cpu_to_le32(IXGBE_MAX_DATA_PER_TXD);
@@ -3570,12 +3573,12 @@ static void ixgbevf_tx_map(struct ixgbevf_ring *tx_ring,
 				tx_desc = IXGBEVF_TX_DESC(tx_ring, 0);
 				i = 0;
 			}
+			tx_desc->read.olinfo_status = 0;
 
 			dma += IXGBE_MAX_DATA_PER_TXD;
 			size -= IXGBE_MAX_DATA_PER_TXD;
 
 			tx_desc->read.buffer_addr = cpu_to_le64(dma);
-			tx_desc->read.olinfo_status = 0;
 		}
 
 		if (likely(!data_len))
@@ -3589,23 +3592,15 @@ static void ixgbevf_tx_map(struct ixgbevf_ring *tx_ring,
 			tx_desc = IXGBEVF_TX_DESC(tx_ring, 0);
 			i = 0;
 		}
+		tx_desc->read.olinfo_status = 0;
 
 		size = skb_frag_size(frag);
 		data_len -= size;
 
 		dma = skb_frag_dma_map(tx_ring->dev, frag, 0, size,
 				       DMA_TO_DEVICE);
-		if (dma_mapping_error(tx_ring->dev, dma))
-			goto dma_error;
 
 		tx_buffer = &tx_ring->tx_buffer_info[i];
-		dma_unmap_len_set(tx_buffer, len, size);
-		dma_unmap_addr_set(tx_buffer, dma, dma);
-
-		tx_desc->read.buffer_addr = cpu_to_le64(dma);
-		tx_desc->read.olinfo_status = 0;
-
-		frag++;
 	}
 
 	/* write last descriptor with RS and EOP bits */