ixgbe: add a netdev pointer to the ring structure

This change places a netdev pointer directly into the ring structure. This
way we can avoid having to determine which netdev we are supposed to be
using and can just access the one on the ring directly.
As a result of this change further collapse of the code is possible by
dropping the adapter from ixgbe_alloc_rx_buffers, and the netdev pointer
from ixgbe_xmit_frame_ring_adv and ixgbe_maybe_stop_tx.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ixgbe/ixgbe.h

@@ -162,6 +162,7 @@ struct ixgbe_rx_queue_stats {
 struct ixgbe_ring {
 	void *desc;			/* descriptor ring memory */
 	struct device *dev;             /* device for DMA mapping */
+	struct net_device *netdev;      /* netdev ring belongs to */
 	union {
 		struct ixgbe_tx_buffer *tx_buffer_info;
 		struct ixgbe_rx_buffer *rx_buffer_info;
@@ -477,14 +478,11 @@ extern void ixgbe_update_stats(struct ixgbe_adapter *adapter);
 extern int ixgbe_init_interrupt_scheme(struct ixgbe_adapter *adapter);
 extern void ixgbe_clear_interrupt_scheme(struct ixgbe_adapter *adapter);
 extern netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *,
-					 struct net_device *,
 					 struct ixgbe_adapter *,
 					 struct ixgbe_ring *);
 extern void ixgbe_unmap_and_free_tx_resource(struct ixgbe_ring *,
                                              struct ixgbe_tx_buffer *);
-extern void ixgbe_alloc_rx_buffers(struct ixgbe_adapter *adapter,
-                                   struct ixgbe_ring *rx_ring,
-				   u16 cleaned_count);
+extern void ixgbe_alloc_rx_buffers(struct ixgbe_ring *, u16);
 extern void ixgbe_write_eitr(struct ixgbe_q_vector *);
 extern int ethtool_ioctl(struct ifreq *ifr);
 extern s32 ixgbe_reinit_fdir_tables_82599(struct ixgbe_hw *hw);

drivers/net/ixgbe/ixgbe_ethtool.c

@@ -1473,6 +1473,7 @@ static int ixgbe_setup_desc_rings(struct ixgbe_adapter *adapter)
 	tx_ring->count = IXGBE_DEFAULT_TXD;
 	tx_ring->queue_index = 0;
 	tx_ring->dev = &adapter->pdev->dev;
+	tx_ring->netdev = adapter->netdev;
 	tx_ring->reg_idx = adapter->tx_ring[0]->reg_idx;
 	tx_ring->numa_node = adapter->node;
 
@@ -1492,6 +1493,7 @@ static int ixgbe_setup_desc_rings(struct ixgbe_adapter *adapter)
 	rx_ring->count = IXGBE_DEFAULT_RXD;
 	rx_ring->queue_index = 0;
 	rx_ring->dev = &adapter->pdev->dev;
+	rx_ring->netdev = adapter->netdev;
 	rx_ring->reg_idx = adapter->rx_ring[0]->reg_idx;
 	rx_ring->rx_buf_len = IXGBE_RXBUFFER_2048;
 	rx_ring->numa_node = adapter->node;
@@ -1595,8 +1597,7 @@ static int ixgbe_check_lbtest_frame(struct sk_buff *skb,
 	return 13;
 }
 
-static u16 ixgbe_clean_test_rings(struct ixgbe_adapter *adapter,
-                                  struct ixgbe_ring *rx_ring,
+static u16 ixgbe_clean_test_rings(struct ixgbe_ring *rx_ring,
                                   struct ixgbe_ring *tx_ring,
                                   unsigned int size)
 {
@@ -1646,7 +1647,7 @@ static u16 ixgbe_clean_test_rings(struct ixgbe_adapter *adapter,
 	}
 
 	/* re-map buffers to ring, store next to clean values */
-	ixgbe_alloc_rx_buffers(adapter, rx_ring, count);
+	ixgbe_alloc_rx_buffers(rx_ring, count);
 	rx_ring->next_to_clean = rx_ntc;
 	tx_ring->next_to_clean = tx_ntc;
 
@@ -1690,7 +1691,6 @@ static int ixgbe_run_loopback_test(struct ixgbe_adapter *adapter)
 		for (i = 0; i < 64; i++) {
 			skb_get(skb);
 			tx_ret_val = ixgbe_xmit_frame_ring(skb,
-							   adapter->netdev,
 							   adapter,
 							   tx_ring);
 			if (tx_ret_val == NETDEV_TX_OK)
@@ -1705,8 +1705,7 @@ static int ixgbe_run_loopback_test(struct ixgbe_adapter *adapter)
 		/* allow 200 milliseconds for packets to go from Tx to Rx */
 		msleep(200);
 
-		good_cnt = ixgbe_clean_test_rings(adapter, rx_ring,
-						  tx_ring, size);
+		good_cnt = ixgbe_clean_test_rings(rx_ring, tx_ring, size);
 		if (good_cnt != 64) {
 			ret_val = 13;
 			break;

drivers/net/ixgbe/ixgbe_main.c

@@ -733,7 +733,6 @@ static bool ixgbe_clean_tx_irq(struct ixgbe_q_vector *q_vector,
 			       struct ixgbe_ring *tx_ring)
 {
 	struct ixgbe_adapter *adapter = q_vector->adapter;
-	struct net_device *netdev = adapter->netdev;
 	union ixgbe_adv_tx_desc *tx_desc, *eop_desc;
 	struct ixgbe_tx_buffer *tx_buffer_info;
 	unsigned int i, eop, count = 0;
@@ -774,15 +773,15 @@ static bool ixgbe_clean_tx_irq(struct ixgbe_q_vector *q_vector,
 	tx_ring->next_to_clean = i;
 
 #define TX_WAKE_THRESHOLD (DESC_NEEDED * 2)
-	if (unlikely(count && netif_carrier_ok(netdev) &&
+	if (unlikely(count && netif_carrier_ok(tx_ring->netdev) &&
 		     (IXGBE_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD))) {
 		/* Make sure that anybody stopping the queue after this
 		 * sees the new next_to_clean.
 		 */
 		smp_mb();
-		if (__netif_subqueue_stopped(netdev, tx_ring->queue_index) &&
+		if (__netif_subqueue_stopped(tx_ring->netdev, tx_ring->queue_index) &&
 		    !test_bit(__IXGBE_DOWN, &adapter->state)) {
-			netif_wake_subqueue(netdev, tx_ring->queue_index);
+			netif_wake_subqueue(tx_ring->netdev, tx_ring->queue_index);
 			++tx_ring->tx_stats.restart_queue;
 		}
 	}
@@ -1004,24 +1003,27 @@ static inline void ixgbe_release_rx_desc(struct ixgbe_ring *rx_ring, u32 val)
 
 /**
  * ixgbe_alloc_rx_buffers - Replace used receive buffers; packet split
- * @adapter: address of board private structure
+ * @rx_ring: ring to place buffers on
+ * @cleaned_count: number of buffers to replace
  **/
-void ixgbe_alloc_rx_buffers(struct ixgbe_adapter *adapter,
-			    struct ixgbe_ring *rx_ring,
-			    u16 cleaned_count)
+void ixgbe_alloc_rx_buffers(struct ixgbe_ring *rx_ring, u16 cleaned_count)
 {
 	union ixgbe_adv_rx_desc *rx_desc;
 	struct ixgbe_rx_buffer *bi;
 	struct sk_buff *skb;
 	u16 i = rx_ring->next_to_use;
 
+	/* do nothing if no valid netdev defined */
+	if (!rx_ring->netdev)
+		return;
+
 	while (cleaned_count--) {
 		rx_desc = IXGBE_RX_DESC_ADV(rx_ring, i);
 		bi = &rx_ring->rx_buffer_info[i];
 		skb = bi->skb;
 
 		if (!skb) {
-			skb = netdev_alloc_skb_ip_align(adapter->netdev,
+			skb = netdev_alloc_skb_ip_align(rx_ring->netdev,
 							rx_ring->rx_buf_len);
 			if (!skb) {
 				rx_ring->rx_stats.alloc_rx_buff_failed++;
@@ -1046,7 +1048,7 @@ void ixgbe_alloc_rx_buffers(struct ixgbe_adapter *adapter,
 
 		if (rx_ring->flags & IXGBE_RING_RX_PS_ENABLED) {
 			if (!bi->page) {
-				bi->page = netdev_alloc_page(adapter->netdev);
+				bi->page = netdev_alloc_page(rx_ring->netdev);
 				if (!bi->page) {
 					rx_ring->rx_stats.alloc_rx_page_failed++;
 					goto no_buffers;
@@ -1304,7 +1306,7 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 		total_rx_bytes += skb->len;
 		total_rx_packets++;
 
-		skb->protocol = eth_type_trans(skb, adapter->netdev);
+		skb->protocol = eth_type_trans(skb, rx_ring->netdev);
 #ifdef IXGBE_FCOE
 		/* if ddp, not passing to ULD unless for FCP_RSP or error */
 		if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED) {
@@ -1320,7 +1322,7 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 
 		/* return some buffers to hardware, one at a time is too slow */
 		if (cleaned_count >= IXGBE_RX_BUFFER_WRITE) {
-			ixgbe_alloc_rx_buffers(adapter, rx_ring, cleaned_count);
+			ixgbe_alloc_rx_buffers(rx_ring, cleaned_count);
 			cleaned_count = 0;
 		}
 
@@ -1335,14 +1337,14 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 	cleaned_count = IXGBE_DESC_UNUSED(rx_ring);
 
 	if (cleaned_count)
-		ixgbe_alloc_rx_buffers(adapter, rx_ring, cleaned_count);
+		ixgbe_alloc_rx_buffers(rx_ring, cleaned_count);
 
 #ifdef IXGBE_FCOE
 	/* include DDPed FCoE data */
 	if (ddp_bytes > 0) {
 		unsigned int mss;
 
-		mss = adapter->netdev->mtu - sizeof(struct fcoe_hdr) -
+		mss = rx_ring->netdev->mtu - sizeof(struct fcoe_hdr) -
 			sizeof(struct fc_frame_header) -
 			sizeof(struct fcoe_crc_eof);
 		if (mss > 512)
@@ -2810,7 +2812,7 @@ void ixgbe_configure_rx_ring(struct ixgbe_adapter *adapter,
 	IXGBE_WRITE_REG(hw, IXGBE_RXDCTL(reg_idx), rxdctl);
 
 	ixgbe_rx_desc_queue_enable(adapter, ring);
-	ixgbe_alloc_rx_buffers(adapter, ring, IXGBE_DESC_UNUSED(ring));
+	ixgbe_alloc_rx_buffers(ring, IXGBE_DESC_UNUSED(ring));
 }
 
 static void ixgbe_setup_psrtype(struct ixgbe_adapter *adapter)
@@ -4455,6 +4457,7 @@ static int ixgbe_alloc_queues(struct ixgbe_adapter *adapter)
 		ring->count = adapter->tx_ring_count;
 		ring->queue_index = i;
 		ring->dev = &adapter->pdev->dev;
+		ring->netdev = adapter->netdev;
 		ring->numa_node = adapter->node;
 
 		adapter->tx_ring[i] = ring;
@@ -4481,6 +4484,7 @@ static int ixgbe_alloc_queues(struct ixgbe_adapter *adapter)
 		ring->count = rx_count;
 		ring->queue_index = i;
 		ring->dev = &adapter->pdev->dev;
+		ring->netdev = adapter->netdev;
 		ring->numa_node = adapter->node;
 
 		adapter->rx_ring[i] = ring;
@@ -6229,10 +6233,9 @@ static void ixgbe_atr(struct ixgbe_adapter *adapter, struct sk_buff *skb,
 	ixgbe_fdir_add_signature_filter_82599(&adapter->hw, &atr_input, queue);
 }
 
-static int __ixgbe_maybe_stop_tx(struct net_device *netdev,
-				 struct ixgbe_ring *tx_ring, int size)
+static int __ixgbe_maybe_stop_tx(struct ixgbe_ring *tx_ring, int size)
 {
-	netif_stop_subqueue(netdev, tx_ring->queue_index);
+	netif_stop_subqueue(tx_ring->netdev, tx_ring->queue_index);
 	/* Herbert's original patch had:
 	 *  smp_mb__after_netif_stop_queue();
 	 * but since that doesn't exist yet, just open code it. */
@@ -6244,17 +6247,16 @@ static int __ixgbe_maybe_stop_tx(struct net_device *netdev,
 		return -EBUSY;
 
 	/* A reprieve! - use start_queue because it doesn't call schedule */
-	netif_start_subqueue(netdev, tx_ring->queue_index);
+	netif_start_subqueue(tx_ring->netdev, tx_ring->queue_index);
 	++tx_ring->tx_stats.restart_queue;
 	return 0;
 }
 
-static int ixgbe_maybe_stop_tx(struct net_device *netdev,
-			      struct ixgbe_ring *tx_ring, int size)
+static int ixgbe_maybe_stop_tx(struct ixgbe_ring *tx_ring, int size)
 {
 	if (likely(IXGBE_DESC_UNUSED(tx_ring) >= size))
 		return 0;
-	return __ixgbe_maybe_stop_tx(netdev, tx_ring, size);
+	return __ixgbe_maybe_stop_tx(tx_ring, size);
 }
 
 static u16 ixgbe_select_queue(struct net_device *dev, struct sk_buff *skb)
@@ -6299,10 +6301,11 @@ static u16 ixgbe_select_queue(struct net_device *dev, struct sk_buff *skb)
 	return skb_tx_hash(dev, skb);
 }
 
-netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb, struct net_device *netdev,
+netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
 			  struct ixgbe_adapter *adapter,
 			  struct ixgbe_ring *tx_ring)
 {
+	struct net_device *netdev = tx_ring->netdev;
 	struct netdev_queue *txq;
 	unsigned int first;
 	unsigned int tx_flags = 0;
@@ -6360,7 +6363,7 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb, struct net_device *netdev
 	for (f = 0; f < skb_shinfo(skb)->nr_frags; f++)
 		count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size);
 
-	if (ixgbe_maybe_stop_tx(netdev, tx_ring, count)) {
+	if (ixgbe_maybe_stop_tx(tx_ring, count)) {
 		tx_ring->tx_stats.tx_busy++;
 		return NETDEV_TX_BUSY;
 	}
@@ -6412,7 +6415,7 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb, struct net_device *netdev
 		txq->tx_bytes += skb->len;
 		txq->tx_packets++;
 		ixgbe_tx_queue(tx_ring, tx_flags, count, skb->len, hdr_len);
-		ixgbe_maybe_stop_tx(netdev, tx_ring, DESC_NEEDED);
+		ixgbe_maybe_stop_tx(tx_ring, DESC_NEEDED);
 
 	} else {
 		dev_kfree_skb_any(skb);
@@ -6429,7 +6432,7 @@ static netdev_tx_t ixgbe_xmit_frame(struct sk_buff *skb, struct net_device *netd
 	struct ixgbe_ring *tx_ring;
 
 	tx_ring = adapter->tx_ring[skb->queue_mapping];
-	return ixgbe_xmit_frame_ring(skb, netdev, adapter, tx_ring);
+	return ixgbe_xmit_frame_ring(skb, adapter, tx_ring);
 }
 
 /**