net/mvpp2: remove CRC length from MRU validation

[ upstream commit 31536a6 ]

CRC is being removed by HW before packet get
write to the buffer, so CRC len should not be
included in MRU validation

Fixes: 79ec620 ("net/mvpp2: update MTU and MRU related calculations")

Signed-off-by: Liron Himi <lironh@marvell.com>
Reviewed-by: Yuri Chipchev <yuric@marvell.com>

drivers/net/mvpp2/mrvl_ethdev.c

@@ -443,8 +443,8 @@ mrvl_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 	 * when this feature has not been enabled/supported so far
 	 * (TODO check scattered_rx flag here once scattered RX is supported).
 	 */
-	if (mru + MRVL_PKT_OFFS > mbuf_data_size) {
-		mru = mbuf_data_size - MRVL_PKT_OFFS;
+	if (mru - RTE_ETHER_CRC_LEN + MRVL_PKT_OFFS > mbuf_data_size) {
+		mru = mbuf_data_size + RTE_ETHER_CRC_LEN - MRVL_PKT_OFFS;
 		mtu = MRVL_PP2_MRU_TO_MTU(mru);
 		MRVL_LOG(WARNING, "MTU too big, max MTU possible limitted "
 			"by current mbuf size: %u. Set MTU to %u, MRU to %u",