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>

1 files changed, 19 insertions, 6 deletions

diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index ebcec30e0783..ffd1f1639706 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/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);