net/iavf: fix TSO max segment size

[ upstream commit 6d05fc9 ]

According to Intel® AVF spec
(https://www.intel.com/content/dam/
www/public/us/en/documents/product-specifications/
ethernet-adaptive-virtual-function-hardware-spec.pdf)
section 2.2.2.3:
The max segment size(MSS) of TSO should not be set lower than 88.

Fixes: a2b29a7 ("net/avf: enable basic Rx Tx")

Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Beilei Xing <beilei.xing@intel.com>

drivers/net/iavf/iavf_rxtx.h

@@ -34,7 +34,7 @@
 #define DEFAULT_TX_RS_THRESH     32
 #define DEFAULT_TX_FREE_THRESH   32
 
-#define IAVF_MIN_TSO_MSS          256
+#define IAVF_MIN_TSO_MSS          88
 #define IAVF_MAX_TSO_MSS          9668
 #define IAVF_TSO_MAX_SEG          UINT8_MAX
 #define IAVF_TX_MAX_MTU_SEG       8