net/mvpp2: remove CRC length from MRU validation

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

Fixes: 79ec62028b9a ("net/mvpp2: update MTU and MRU related calculations")
Cc: stable@dpdk.org
Signed-off-by: Liron Himi <lironh@marvell.com>
Reviewed-by: Yuri Chipchev <yuric@marvell.com>

diff --git a/drivers/net/mvpp2/mrvl_ethdev.c b/drivers/net/mvpp2/mrvl_ethdev.c
index e95c6e5..476227b 100644 (file)
--- a/drivers/net/mvpp2/mrvl_ethdev.c
+++ b/drivers/net/mvpp2/mrvl_ethdev.c
@@ -441,8 +441,8 @@ 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",