myri10ge: correctly detect when TSO should be used

Correctly detect when TSO should be used on transmit by looking at the
skb->gso_size rather than seeing if the frame was larger than our MTU.
The old method causes problems when a host with a large (jumbo) MTU is
sending to a host with a small (standard) MTU.

Signed-off-by: Brice Goglin <brice@myri.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
index b05b20ef8c0a..c216e6a5d235 100644
--- a/drivers/net/myri10ge/myri10ge.c
+++ b/drivers/net/myri10ge/myri10ge.c
@@ -71,7 +71,7 @@
 #include "myri10ge_mcp.h"
 #include "myri10ge_mcp_gen_header.h"
 
-#define MYRI10GE_VERSION_STR "1.3.0-1.226"
+#define MYRI10GE_VERSION_STR "1.3.0-1.227"
 
 MODULE_DESCRIPTION("Myricom 10G driver (10GbE)");
 MODULE_AUTHOR("Maintainer: help@myri.com");
@@ -2015,10 +2015,9 @@ again:
         mss = 0;
         max_segments = MXGEFW_MAX_SEND_DESC;
 
-        if (skb->len > (dev->mtu + ETH_HLEN)) {
+        if (skb_is_gso(skb)) {
                 mss = skb_shinfo(skb)->gso_size;
-                if (mss != 0)
-                        max_segments = MYRI10GE_MAX_SEND_DESC_TSO;
+                max_segments = MYRI10GE_MAX_SEND_DESC_TSO;
         }
 
         if ((unlikely(avail < max_segments))) {