Max frame size setup should consider double VLAN case.
Fixes: ae2bdd0219cb ("net/ice: support MTU setting")
Signed-off-by: Qi Zhang <qi.z.zh...@intel.com>
---
drivers/net/ice/ice_ethdev.c | 3 +--
drivers/net/ice/ice_ethdev.h | 7 +++++++
drivers/net/ice/ice_rxtx.c | 2 +-
3 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ice/ice_ethdev.c b/drivers/net/ice/ice_ethdev.c
index cdb5502d1..b9b32fa97 100644
--- a/drivers/net/ice/ice_ethdev.c
+++ b/drivers/net/ice/ice_ethdev.c
@@ -2043,8 +2043,7 @@ ice_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
{
struct ice_pf *pf = ICE_DEV_PRIVATE_TO_PF(dev->data->dev_private);
struct rte_eth_dev_data *dev_data = pf->dev_data;
- uint32_t frame_size = mtu + ETHER_HDR_LEN
- + ETHER_CRC_LEN + ICE_VLAN_TAG_SIZE;
+ uint32_t frame_size = mtu + ICE_ETH_OVERHEAD;
/* check if mtu is within the allowed range */
if (mtu < ETHER_MIN_MTU || frame_size > ICE_FRAME_SIZE_MAX)
diff --git a/drivers/net/ice/ice_ethdev.h b/drivers/net/ice/ice_ethdev.h
index 3cefa5b5b..655624c3c 100644
--- a/drivers/net/ice/ice_ethdev.h
+++ b/drivers/net/ice/ice_ethdev.h
@@ -115,6 +115,13 @@
ETH_RSS_NONFRAG_IPV6_OTHER | \
ETH_RSS_L2_PAYLOAD)
+/**
+ * The overhead from MTU to max frame size.
+ * Considering QinQ packet, the VLAN tag needs to be counted twice.
+ */
+#define ICE_ETH_OVERHEAD \
+ (ETHER_HDR_LEN + ETHER_CRC_LEN + ICE_VLAN_TAG_SIZE * 2)
+
struct ice_adapter;
/**
diff --git a/drivers/net/ice/ice_rxtx.c b/drivers/net/ice/ice_rxtx.c
index c794ee861..b3ff14694 100644
--- a/drivers/net/ice/ice_rxtx.c
+++ b/drivers/net/ice/ice_rxtx.c
@@ -113,7 +113,7 @@ ice_program_hw_rx_queue(struct ice_rx_queue *rxq)
RTE_PKTMBUF_HEADROOM);
/* Check if scattered RX needs to be used. */
- if ((rxq->max_pkt_len + 2 * ICE_VLAN_TAG_SIZE) > buf_size)
+ if (rxq->max_pkt_len > buf_size)
dev->data->scattered_rx = 1;
rxq->qrx_tail = hw->hw_addr + QRX_TAIL(rxq->reg_idx);
--
2.13.6
