net/thunderx: fix jumbo frame flag condition for MTU set

The jumbo frame uses the 'RTE_ETHER_MAX_LEN' as boundary condition,
but the Ether overhead is larger than 18 when it supports dual VLAN tags.
That will cause the jumbo flag rx offload is wrong when MTU size is
'RTE_ETHER_MTU'.

This fix will change the boundary condition with 'RTE_ETHER_MTU' and
overhead, that perhaps impacts the cases of the jumbo frame related.

Fixes: 65d9804edc05 ("net/thunderx: support MTU configuration")
Cc: stable@dpdk.org
Signed-off-by: Steve Yang <stevex.yang@intel.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/drivers/net/thunderx/base/nicvf_hw_defs.h b/drivers/net/thunderx/base/nicvf_hw_defs.h
index b12c8ec..adc8ec9 100644 (file)
--- a/drivers/net/thunderx/base/nicvf_hw_defs.h
+++ b/drivers/net/thunderx/base/nicvf_hw_defs.h
@@ -176,6 +176,7 @@
 #define NIC_HW_MAX_MTU                  (9190)
 #define NIC_HW_MAX_FRS                  (NIC_HW_MAX_MTU + NIC_HW_L2_OVERHEAD)
 #define NIC_HW_MAX_SEGS                 (12)
+#define NIC_HW_L2_MAX_LEN              (RTE_ETHER_MTU + NIC_HW_L2_OVERHEAD)
 
 /* Descriptor alignments */
 #define NICVF_RBDR_BASE_ALIGN_BYTES     (128) /* 7 bits */

diff --git a/drivers/net/thunderx/nicvf_ethdev.c b/drivers/net/thunderx/nicvf_ethdev.c
index b6bb05e..c2e7c33 100644 (file)
--- a/drivers/net/thunderx/nicvf_ethdev.c
+++ b/drivers/net/thunderx/nicvf_ethdev.c
@@ -176,7 +176,7 @@ nicvf_dev_set_mtu(struct rte_eth_dev *dev, uint16_t mtu)
                (frame_size + 2 * VLAN_TAG_SIZE > buffsz * NIC_HW_MAX_SEGS))
                return -EINVAL;
 
-       if (frame_size > RTE_ETHER_MAX_LEN)
+       if (frame_size > NIC_HW_L2_MAX_LEN)
                rxmode->offloads |= DEV_RX_OFFLOAD_JUMBO_FRAME;
        else
                rxmode->offloads &= ~DEV_RX_OFFLOAD_JUMBO_FRAME;