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 b12c8ec50a323e7078d4ed3a5e411d30b1fe7347..adc8ec943dede54e92691eed34ee25b3747b5f57 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 b6bb05e5001f5691fdcc1bea1431782736135a64..c2e7c334d41fc52a77c48920b4e6cc097a88fbe6 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;