igb: add a flags value to the ring

This patch adds a flags value to the ring that cleans up some of the last
remaining items from the ring in order to help seperate it from the adapter
struct.  By implementing these flags it becomes possible for different rings
to support different functions such as rx checksumming.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/igb/igb.h

@@ -192,6 +192,8 @@ struct igb_ring {
 	unsigned int total_bytes;
 	unsigned int total_packets;
 
+	u32 flags;
+
 	union {
 		/* TX */
 		struct {
@@ -206,6 +208,13 @@ struct igb_ring {
 	};
 };
 
+#define IGB_RING_FLAG_RX_CSUM        0x00000001 /* RX CSUM enabled */
+#define IGB_RING_FLAG_RX_SCTP_CSUM   0x00000002 /* SCTP CSUM offload enabled */
+
+#define IGB_RING_FLAG_TX_CTX_IDX     0x00000001 /* HW requires context index */
+
+#define IGB_ADVTXD_DCMD (E1000_TXD_CMD_EOP | E1000_TXD_CMD_RS)
+
 #define E1000_RX_DESC_ADV(R, i)	    \
 	(&(((union e1000_adv_rx_desc *)((R).desc))[i]))
 #define E1000_TX_DESC_ADV(R, i)	    \
@@ -245,7 +254,6 @@ struct igb_adapter {
 	/* TX */
 	struct igb_ring *tx_ring;      /* One per active queue */
 	unsigned long tx_queue_len;
-	u32 txd_cmd;
 	u32 gotc;
 	u64 gotc_old;
 	u64 tpt_old;
@@ -303,8 +311,6 @@ struct igb_adapter {
 #define IGB_FLAG_HAS_MSI           (1 << 0)
 #define IGB_FLAG_DCA_ENABLED       (1 << 1)
 #define IGB_FLAG_QUAD_PORT_A       (1 << 2)
-#define IGB_FLAG_NEED_CTX_IDX      (1 << 3)
-#define IGB_FLAG_RX_CSUM_DISABLED  (1 << 4)
 
 enum e1000_state_t {
 	__IGB_TESTING,

drivers/net/igb/igb_ethtool.c

@@ -279,17 +279,20 @@ static int igb_set_pauseparam(struct net_device *netdev,
 static u32 igb_get_rx_csum(struct net_device *netdev)
 {
 	struct igb_adapter *adapter = netdev_priv(netdev);
-	return !(adapter->flags & IGB_FLAG_RX_CSUM_DISABLED);
+	return !!(adapter->rx_ring[0].flags & IGB_RING_FLAG_RX_CSUM);
 }
 
 static int igb_set_rx_csum(struct net_device *netdev, u32 data)
 {
 	struct igb_adapter *adapter = netdev_priv(netdev);
+	int i;
 
-	if (data)
-		adapter->flags &= ~IGB_FLAG_RX_CSUM_DISABLED;
-	else
-		adapter->flags |= IGB_FLAG_RX_CSUM_DISABLED;
+	for (i = 0; i < adapter->num_rx_queues; i++) {
+		if (data)
+			adapter->rx_ring[i].flags |= IGB_RING_FLAG_RX_CSUM;
+		else
+			adapter->rx_ring[i].flags &= ~IGB_RING_FLAG_RX_CSUM;
+	}
 
 	return 0;
 }

drivers/net/igb/igb_main.c

@@ -437,13 +437,21 @@ static int igb_alloc_queues(struct igb_adapter *adapter)
 		ring->count = adapter->tx_ring_count;
 		ring->queue_index = i;
 		ring->pdev = adapter->pdev;
+		/* For 82575, context index must be unique per ring. */
+		if (adapter->hw.mac.type == e1000_82575)
+			ring->flags = IGB_RING_FLAG_TX_CTX_IDX;
 	}
+
 	for (i = 0; i < adapter->num_rx_queues; i++) {
 		struct igb_ring *ring = &(adapter->rx_ring[i]);
 		ring->count = adapter->rx_ring_count;
 		ring->queue_index = i;
 		ring->pdev = adapter->pdev;
 		ring->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;
+		ring->flags = IGB_RING_FLAG_RX_CSUM; /* enable rx checksum */
+		/* set flag indicating ring supports SCTP checksum offload */
+		if (adapter->hw.mac.type >= e1000_82576)
+			ring->flags |= IGB_RING_FLAG_RX_SCTP_CSUM;
 	}
 
 	igb_cache_ring_register(adapter);
@@ -1517,16 +1525,6 @@ static int __devinit igb_probe(struct pci_dev *pdev,
 
 	igb_get_bus_info_pcie(hw);
 
-	/* set flags */
-	switch (hw->mac.type) {
-	case e1000_82575:
-		adapter->flags |= IGB_FLAG_NEED_CTX_IDX;
-		break;
-	case e1000_82576:
-	default:
-		break;
-	}
-
 	hw->phy.autoneg_wait_to_complete = false;
 	hw->mac.adaptive_ifs = true;
 
@@ -2149,9 +2147,6 @@ static void igb_configure_tx(struct igb_adapter *adapter)
 
 	for (i = 0; i < adapter->num_tx_queues; i++)
 		igb_configure_tx_ring(adapter, &adapter->tx_ring[i]);
-
-	/* Setup Transmit Descriptor Settings for eop descriptor */
-	adapter->txd_cmd = E1000_TXD_CMD_EOP | E1000_TXD_CMD_RS;
 }
 
 /**
@@ -3272,8 +3267,7 @@ static void igb_set_itr(struct igb_adapter *adapter)
 #define IGB_TX_FLAGS_VLAN_MASK	0xffff0000
 #define IGB_TX_FLAGS_VLAN_SHIFT	16
 
-static inline int igb_tso_adv(struct igb_adapter *adapter,
-			      struct igb_ring *tx_ring,
+static inline int igb_tso_adv(struct igb_ring *tx_ring,
 			      struct sk_buff *skb, u32 tx_flags, u8 *hdr_len)
 {
 	struct e1000_adv_tx_context_desc *context_desc;
@@ -3335,8 +3329,8 @@ static inline int igb_tso_adv(struct igb_adapter *adapter,
 	mss_l4len_idx |= (l4len << E1000_ADVTXD_L4LEN_SHIFT);
 
 	/* For 82575, context index must be unique per ring. */
-	if (adapter->flags & IGB_FLAG_NEED_CTX_IDX)
-		mss_l4len_idx |= tx_ring->queue_index << 4;
+	if (tx_ring->flags & IGB_RING_FLAG_TX_CTX_IDX)
+		mss_l4len_idx |= tx_ring->reg_idx << 4;
 
 	context_desc->mss_l4len_idx = cpu_to_le32(mss_l4len_idx);
 	context_desc->seqnum_seed = 0;
@@ -3353,9 +3347,8 @@ static inline int igb_tso_adv(struct igb_adapter *adapter,
 	return true;
 }
 
-static inline bool igb_tx_csum_adv(struct igb_adapter *adapter,
-					struct igb_ring *tx_ring,
-					struct sk_buff *skb, u32 tx_flags)
+static inline bool igb_tx_csum_adv(struct igb_ring *tx_ring,
+				   struct sk_buff *skb, u32 tx_flags)
 {
 	struct e1000_adv_tx_context_desc *context_desc;
 	struct pci_dev *pdev = tx_ring->pdev;
@@ -3417,11 +3410,9 @@ static inline bool igb_tx_csum_adv(struct igb_adapter *adapter,
 
 		context_desc->type_tucmd_mlhl = cpu_to_le32(tu_cmd);
 		context_desc->seqnum_seed = 0;
-		if (adapter->flags & IGB_FLAG_NEED_CTX_IDX)
+		if (tx_ring->flags & IGB_RING_FLAG_TX_CTX_IDX)
 			context_desc->mss_l4len_idx =
-				cpu_to_le32(tx_ring->queue_index << 4);
-		else
-			context_desc->mss_l4len_idx = 0;
+				cpu_to_le32(tx_ring->reg_idx << 4);
 
 		buffer_info->time_stamp = jiffies;
 		buffer_info->next_to_watch = i;
@@ -3492,8 +3483,7 @@ static inline int igb_tx_map_adv(struct igb_ring *tx_ring, struct sk_buff *skb,
 	return count + 1;
 }
 
-static inline void igb_tx_queue_adv(struct igb_adapter *adapter,
-				    struct igb_ring *tx_ring,
+static inline void igb_tx_queue_adv(struct igb_ring *tx_ring,
 				    int tx_flags, int count, u32 paylen,
 				    u8 hdr_len)
 {
@@ -3525,10 +3515,11 @@ static inline void igb_tx_queue_adv(struct igb_adapter *adapter,
 		olinfo_status |= E1000_TXD_POPTS_TXSM << 8;
 	}
 
-	if ((adapter->flags & IGB_FLAG_NEED_CTX_IDX) &&
-	    (tx_flags & (IGB_TX_FLAGS_CSUM | IGB_TX_FLAGS_TSO |
+	if ((tx_ring->flags & IGB_RING_FLAG_TX_CTX_IDX) &&
+	    (tx_flags & (IGB_TX_FLAGS_CSUM |
+	                 IGB_TX_FLAGS_TSO |
 			 IGB_TX_FLAGS_VLAN)))
-		olinfo_status |= tx_ring->queue_index << 4;
+		olinfo_status |= tx_ring->reg_idx << 4;
 
 	olinfo_status |= ((paylen - hdr_len) << E1000_ADVTXD_PAYLEN_SHIFT);
 
@@ -3545,7 +3536,7 @@ static inline void igb_tx_queue_adv(struct igb_adapter *adapter,
 			i = 0;
 	}
 
-	tx_desc->read.cmd_type_len |= cpu_to_le32(adapter->txd_cmd);
+	tx_desc->read.cmd_type_len |= cpu_to_le32(IGB_ADVTXD_DCMD);
 	/* Force memory writes to complete before letting h/w
 	 * know there are new descriptors to fetch.  (Only
 	 * applicable for weak-ordered memory model archs,
@@ -3644,17 +3635,17 @@ static netdev_tx_t igb_xmit_frame_ring_adv(struct sk_buff *skb,
 		tx_flags |= IGB_TX_FLAGS_IPV4;
 
 	first = tx_ring->next_to_use;
-	tso = skb_is_gso(skb) ? igb_tso_adv(adapter, tx_ring, skb, tx_flags,
-					      &hdr_len) : 0;
-
-	if (tso < 0) {
-		dev_kfree_skb_any(skb);
-		return NETDEV_TX_OK;
+	if (skb_is_gso(skb)) {
+		tso = igb_tso_adv(tx_ring, skb, tx_flags, &hdr_len);
+		if (tso < 0) {
+			dev_kfree_skb_any(skb);
+			return NETDEV_TX_OK;
+		}
 	}
 
 	if (tso)
 		tx_flags |= IGB_TX_FLAGS_TSO;
-	else if (igb_tx_csum_adv(adapter, tx_ring, skb, tx_flags) &&
+	else if (igb_tx_csum_adv(tx_ring, skb, tx_flags) &&
 	         (skb->ip_summed == CHECKSUM_PARTIAL))
 		tx_flags |= IGB_TX_FLAGS_CSUM;
 
@@ -3664,17 +3655,18 @@ static netdev_tx_t igb_xmit_frame_ring_adv(struct sk_buff *skb,
 	 */
 	count = igb_tx_map_adv(tx_ring, skb, first);
 
-	if (count) {
-		igb_tx_queue_adv(adapter, tx_ring, tx_flags, count,
-			         skb->len, hdr_len);
-		/* Make sure there is space in the ring for the next send. */
-		igb_maybe_stop_tx(netdev, tx_ring, MAX_SKB_FRAGS + 4);
-	} else {
+	if (!count) {
 		dev_kfree_skb_any(skb);
 		tx_ring->buffer_info[first].time_stamp = 0;
 		tx_ring->next_to_use = first;
+		return NETDEV_TX_OK;
 	}
 
+	igb_tx_queue_adv(tx_ring, tx_flags, count, skb->len, hdr_len);
+
+	/* Make sure there is space in the ring for the next send. */
+	igb_maybe_stop_tx(netdev, tx_ring, MAX_SKB_FRAGS + 4);
+
 	return NETDEV_TX_OK;
 }
 
@@ -4800,15 +4792,15 @@ static void igb_receive_skb(struct igb_q_vector *q_vector,
 }
 
 static inline void igb_rx_checksum_adv(struct igb_ring *ring,
-                                       struct igb_adapter *adapter,
 				       u32 status_err, struct sk_buff *skb)
 {
 	skb->ip_summed = CHECKSUM_NONE;
 
 	/* Ignore Checksum bit is set or checksum is disabled through ethtool */
-	if ((status_err & E1000_RXD_STAT_IXSM) ||
-	    (adapter->flags & IGB_FLAG_RX_CSUM_DISABLED))
+	if (!(ring->flags & IGB_RING_FLAG_RX_CSUM) ||
+	     (status_err & E1000_RXD_STAT_IXSM))
 		return;
+
 	/* TCP/UDP checksum error bit is set */
 	if (status_err &
 	    (E1000_RXDEXT_STATERR_TCPE | E1000_RXDEXT_STATERR_IPE)) {
@@ -4817,9 +4809,10 @@ static inline void igb_rx_checksum_adv(struct igb_ring *ring,
 		 * L4E bit is set incorrectly on 64 byte (60 byte w/o crc)
 		 * packets, (aka let the stack check the crc32c)
 		 */
-		if (!((adapter->hw.mac.type == e1000_82576) &&
-		      (skb->len == 60)))
+		if ((skb->len == 60) &&
+		    (ring->flags & IGB_RING_FLAG_RX_SCTP_CSUM))
 			ring->rx_stats.csum_err++;
+
 		/* let the stack verify checksum errors */
 		return;
 	}
@@ -4827,7 +4820,7 @@ static inline void igb_rx_checksum_adv(struct igb_ring *ring,
 	if (status_err & (E1000_RXD_STAT_TCPCS | E1000_RXD_STAT_UDPCS))
 		skb->ip_summed = CHECKSUM_UNNECESSARY;
 
-	dev_dbg(&adapter->pdev->dev, "cksum success: bits %08X\n", status_err);
+	dev_dbg(&ring->pdev->dev, "cksum success: bits %08X\n", status_err);
 }
 
 static inline u16 igb_get_hlen(struct igb_ring *rx_ring,
@@ -4978,7 +4971,7 @@ static bool igb_clean_rx_irq_adv(struct igb_q_vector *q_vector,
 		total_bytes += skb->len;
 		total_packets++;
 
-		igb_rx_checksum_adv(rx_ring, adapter, staterr, skb);
+		igb_rx_checksum_adv(rx_ring, staterr, skb);
 
 		skb->protocol = eth_type_trans(skb, netdev);
 		skb_record_rx_queue(skb, rx_ring->queue_index);