the mininal tx ring size is 2 as if one we wrap on the same descriptor
and can cause IP lock on GEM (gigabit version) this is always the case
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>