e1000: tune our dynamic itr transmit packet accounting

The driver was still mis-calculating the number of bytes sent during
transmit, now the driver computes what appears to be exactly 100%
correct byte counts (not including CRC) when figuring out how many
bytes and frames were sent during the current transmit packet.

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 8c6c74d1284a..ae76479d89d1 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -4020,10 +4020,13 @@ e1000_clean_tx_irq(struct e1000_adapter *adapter,
 
                         if (cleaned) {
                                 struct sk_buff *skb = buffer_info->skb;
-                                unsigned int segs = skb_shinfo(skb)->gso_segs;
+                                unsigned int segs, bytecount;
+                                segs = skb_shinfo(skb)->gso_segs ?: 1;
+                                /* multiply data chunks by size of headers */
+                                bytecount = ((segs - 1) * skb_headlen(skb)) +
+                                            skb->len;
                                 total_tx_packets += segs;
-                                total_tx_packets++;
-                                total_tx_bytes += skb->len;
+                                total_tx_bytes += bytecount;
                         }
                         e1000_unmap_and_free_tx_resource(adapter, buffer_info);
                         tx_desc->upper.data = 0;