The scalar Tx path would send empty buffer that causes the Tx queue to
overflow.
This patch adds the last buffer length judgment in tx_prepare to fix this
issue, rte_errno will be set to EINVAL and returned if the last buffer is
empty.
Fixes: 17c7d0f9d6 ("net/ice: support basic Rx/Tx")
Fixes: ccf33dccf7 ("net/ice: check illegal packet sizes")
Cc: stable@dpdk.org
Signed-off-by: Mingjin Ye <mingjinx.ye@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>
688cb2f2c6