ixgbe: Modify 82599 HWRSC statistics counters

Divide 82599 HWRSC counters into aggregated and flushed to count number of
packets getting coalesced per TCP connection.

Signed-off-by:  Mallikarjuna R Chilakala <mallikarjuna.chilakala@intel.com>
Acked-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ixgbe/ixgbe.h

@@ -159,6 +159,7 @@ struct ixgbe_ring {
 	struct ixgbe_queue_stats stats;
 	unsigned long reinit_state;
 	u64 rsc_count;			/* stat for coalesced packets */
+	u64 rsc_flush;			/* stats for flushed packets */
 
 	unsigned int size;		/* length in bytes */
 	dma_addr_t dma;			/* phys. address of descriptor ring */
@@ -375,7 +376,8 @@ struct ixgbe_adapter {
 #ifdef IXGBE_FCOE
 	struct ixgbe_fcoe fcoe;
 #endif /* IXGBE_FCOE */
-	u64 rsc_count;
+	u64 rsc_total_count;
+	u64 rsc_total_flush;
 	u32 wol;
 	u16 eeprom_version;
 };

drivers/net/ixgbe/ixgbe_ethtool.c

@@ -79,7 +79,8 @@ static struct ixgbe_stats ixgbe_gstrings_stats[] = {
 	{"rx_over_errors", IXGBE_NETDEV_STAT(stats.rx_over_errors)},
 	{"rx_crc_errors", IXGBE_NETDEV_STAT(stats.rx_crc_errors)},
 	{"rx_frame_errors", IXGBE_NETDEV_STAT(stats.rx_frame_errors)},
-	{"hw_rsc_count", IXGBE_STAT(rsc_count)},
+	{"hw_rsc_aggregated", IXGBE_STAT(rsc_total_count)},
+	{"hw_rsc_flushed", IXGBE_STAT(rsc_total_flush)},
 	{"fdir_match", IXGBE_STAT(stats.fdirmatch)},
 	{"fdir_miss", IXGBE_STAT(stats.fdirmiss)},
 	{"rx_fifo_errors", IXGBE_NETDEV_STAT(stats.rx_fifo_errors)},

drivers/net/ixgbe/ixgbe_main.c

@@ -729,12 +729,14 @@ static inline u32 ixgbe_get_rsc_count(union ixgbe_adv_rx_desc *rx_desc)
 /**
  * ixgbe_transform_rsc_queue - change rsc queue into a full packet
  * @skb: pointer to the last skb in the rsc queue
+ * @count: pointer to number of packets coalesced in this context
  *
  * This function changes a queue full of hw rsc buffers into a completed
  * packet.  It uses the ->prev pointers to find the first packet and then
  * turns it into the frag list owner.
  **/
-static inline struct sk_buff *ixgbe_transform_rsc_queue(struct sk_buff *skb)
+static inline struct sk_buff *ixgbe_transform_rsc_queue(struct sk_buff *skb,
+                                                        u64 *count)
 {
 	unsigned int frag_list_size = 0;
 
@@ -743,6 +745,7 @@ static inline struct sk_buff *ixgbe_transform_rsc_queue(struct sk_buff *skb)
 		frag_list_size += skb->len;
 		skb->prev = NULL;
 		skb = prev;
+		*count += 1;
 	}
 
 	skb_shinfo(skb)->frag_list = skb->next;
@@ -845,14 +848,20 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
 			u32 nextp = (staterr & IXGBE_RXDADV_NEXTP_MASK) >>
 				     IXGBE_RXDADV_NEXTP_SHIFT;
 			next_buffer = &rx_ring->rx_buffer_info[nextp];
-			rx_ring->rsc_count += (rsc_count - 1);
 		} else {
 			next_buffer = &rx_ring->rx_buffer_info[i];
 		}
 
 		if (staterr & IXGBE_RXD_STAT_EOP) {
 			if (skb->prev)
-				skb = ixgbe_transform_rsc_queue(skb);
+				skb = ixgbe_transform_rsc_queue(skb, &(rx_ring->rsc_count));
+			if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED) {
+				if (rx_ring->flags & IXGBE_RING_RX_PS_ENABLED)
+					rx_ring->rsc_count += skb_shinfo(skb)->nr_frags;
+				else
+					rx_ring->rsc_count++;
+				rx_ring->rsc_flush++;
+			}
 			rx_ring->stats.packets++;
 			rx_ring->stats.bytes += skb->len;
 		} else {
@@ -4474,14 +4483,18 @@ void ixgbe_update_stats(struct ixgbe_adapter *adapter)
 	u64 total_mpc = 0;
 	u32 i, missed_rx = 0, mpc, bprc, lxon, lxoff, xon_off_tot;
 
-	if (hw->mac.type == ixgbe_mac_82599EB) {
+	if (adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED) {
 		u64 rsc_count = 0;
+		u64 rsc_flush = 0;
 		for (i = 0; i < 16; i++)
 			adapter->hw_rx_no_dma_resources +=
 			                     IXGBE_READ_REG(hw, IXGBE_QPRDC(i));
-		for (i = 0; i < adapter->num_rx_queues; i++)
+		for (i = 0; i < adapter->num_rx_queues; i++) {
 			rsc_count += adapter->rx_ring[i].rsc_count;
-		adapter->rsc_count = rsc_count;
+			rsc_flush += adapter->rx_ring[i].rsc_flush;
+		}
+		adapter->rsc_total_count = rsc_count;
+		adapter->rsc_total_flush = rsc_flush;
 	}
 
 	adapter->stats.crcerrs += IXGBE_READ_REG(hw, IXGBE_CRCERRS);