igb: Don't use NETDEV_FRAG_PAGE_MAX_SIZE in descriptor calculation

This change updates igb so that it will correctly perform the descriptor
count calculation.  Previously it was taking NETDEV_FRAG_PAGE_MAX_SIZE
into account with isn't really correct since a different value is used to
determine the size of the pages used for TCP.  That is actually determined
by SKB_FRAG_PAGE_ORDER.

Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 8 deletions

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index e63664649029..8a45ed7506c5 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -4974,6 +4974,7 @@ netdev_tx_t igb_xmit_frame_ring(struct sk_buff *skb,
         struct igb_tx_buffer *first;
         int tso;
         u32 tx_flags = 0;
+        unsigned short f;
         u16 count = TXD_USE_COUNT(skb_headlen(skb));
         __be16 protocol = vlan_get_protocol(skb);
         u8 hdr_len = 0;
@@ -4984,14 +4985,8 @@ netdev_tx_t igb_xmit_frame_ring(struct sk_buff *skb,
          *       + 1 desc for context descriptor,
          * otherwise try next time
          */
-        if (NETDEV_FRAG_PAGE_MAX_SIZE > IGB_MAX_DATA_PER_TXD) {
-                unsigned short f;
-
-                for (f = 0; f < skb_shinfo(skb)->nr_frags; f++)
-                        count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size);
-        } else {
-                count += skb_shinfo(skb)->nr_frags;
-        }
+        for (f = 0; f < skb_shinfo(skb)->nr_frags; f++)
+                count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size);
 
         if (igb_maybe_stop_tx(tx_ring, count + 3)) {
                 /* this is a hard error */