[dpdk-stable] [v3] net/i40e: fix vlan packets drop

[Xiao Zhang]

VLAN packets with ip length bigger than 1496 will not be received by
i40e/i40evf due to wrong packets size checking. This patch fixes the
issue by correcting the maximum frame size during checking.

Fixes: 43e5488c0ac6 ("net/i40e: support MTU configuration")
Cc: stable at dpdk.org

Signed-off-by: Xiao Zhang <xiao.zhang at intel.com>
---
v3
Checking more places using max packet len.
v2
Add fix for i40evf and correct the checking when using the max_pkt_len.
---
 drivers/net/i40e/i40e_ethdev.c    |  2 +-
 drivers/net/i40e/i40e_ethdev_vf.c | 11 +++++++----
 drivers/net/i40e/i40e_fdir.c      |  2 +-
 drivers/net/i40e/i40e_rxtx.c      |  9 ++++++---
 lib/librte_ethdev/rte_ethdev.c    | 10 ++++++++--
 lib/librte_net/rte_ether.h        |  1 +
 6 files changed, 24 insertions(+), 11 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 77a4683..b0e23c7 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -12105,7 +12105,7 @@ i40e_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 		return -EBUSY;
 	}
 
-	if (frame_size > RTE_ETHER_MAX_LEN)
+	if (frame_size > RTE_ETHER_MAX_LEN + I40E_VLAN_TAG_SIZE * 2)
 		dev_data->dev_conf.rxmode.offloads |=
 			DEV_RX_OFFLOAD_JUMBO_FRAME;
 	else
diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index 5dba092..1e0b50f 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -1772,7 +1772,8 @@ i40evf_rxq_init(struct rte_eth_dev *dev, struct i40e_rx_queue *rxq)
 	 * Check if the jumbo frame and maximum packet length are set correctly
 	 */
 	if (dev_data->dev_conf.rxmode.offloads & DEV_RX_OFFLOAD_JUMBO_FRAME) {
-		if (rxq->max_pkt_len <= RTE_ETHER_MAX_LEN ||
+		if (rxq->max_pkt_len <= RTE_ETHER_MAX_LEN +
+				I40E_VLAN_TAG_SIZE * 2 ||
 		    rxq->max_pkt_len > I40E_FRAME_SIZE_MAX) {
 			PMD_DRV_LOG(ERR, "maximum packet length must be "
 				"larger than %u and smaller than %u, as jumbo "
@@ -1782,12 +1783,14 @@ i40evf_rxq_init(struct rte_eth_dev *dev, struct i40e_rx_queue *rxq)
 		}
 	} else {
 		if (rxq->max_pkt_len < RTE_ETHER_MIN_LEN ||
-		    rxq->max_pkt_len > RTE_ETHER_MAX_LEN) {
+		    rxq->max_pkt_len > RTE_ETHER_MAX_LEN +
+				I40E_VLAN_TAG_SIZE * 2) {
 			PMD_DRV_LOG(ERR, "maximum packet length must be "
 				"larger than %u and smaller than %u, as jumbo "
 				"frame is disabled",
 				(uint32_t)RTE_ETHER_MIN_LEN,
-				(uint32_t)RTE_ETHER_MAX_LEN);
+				(uint32_t)RTE_ETHER_MAX_LEN +
+					I40E_VLAN_TAG_SIZE * 2);
 			return I40E_ERR_CONFIG;
 		}
 	}
@@ -2747,7 +2750,7 @@ i40evf_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 		return -EBUSY;
 	}
 
-	if (frame_size > RTE_ETHER_MAX_LEN)
+	if (frame_size > RTE_ETHER_MAX_LEN + I40E_VLAN_TAG_SIZE * 2)
 		dev_data->dev_conf.rxmode.offloads |=
 			DEV_RX_OFFLOAD_JUMBO_FRAME;
 	else
diff --git a/drivers/net/i40e/i40e_fdir.c b/drivers/net/i40e/i40e_fdir.c
index dee007d..8b813cb 100644
--- a/drivers/net/i40e/i40e_fdir.c
+++ b/drivers/net/i40e/i40e_fdir.c
@@ -113,7 +113,7 @@ i40e_fdir_rx_queue_init(struct i40e_rx_queue *rxq)
 #endif
 	rx_ctx.dtype = i40e_header_split_none;
 	rx_ctx.hsplit_0 = I40E_HEADER_SPLIT_NONE;
-	rx_ctx.rxmax = RTE_ETHER_MAX_LEN;
+	rx_ctx.rxmax = RTE_ETHER_MAX_LEN + I40E_VLAN_TAG_SIZE * 2;
 	rx_ctx.tphrdesc_ena = 1;
 	rx_ctx.tphwdesc_ena = 1;
 	rx_ctx.tphdata_ena = 1;
diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
index 6a66cec..a93b11f 100644
--- a/drivers/net/i40e/i40e_rxtx.c
+++ b/drivers/net/i40e/i40e_rxtx.c
@@ -2617,7 +2617,8 @@ i40e_rx_queue_config(struct i40e_rx_queue *rxq)
 		RTE_MIN((uint32_t)(hw->func_caps.rx_buf_chain_len *
 			rxq->rx_buf_len), data->dev_conf.rxmode.max_rx_pkt_len);
 	if (data->dev_conf.rxmode.offloads & DEV_RX_OFFLOAD_JUMBO_FRAME) {
-		if (rxq->max_pkt_len <= RTE_ETHER_MAX_LEN ||
+		if (rxq->max_pkt_len <= RTE_ETHER_MAX_LEN +
+				I40E_VLAN_TAG_SIZE * 2 ||
 			rxq->max_pkt_len > I40E_FRAME_SIZE_MAX) {
 			PMD_DRV_LOG(ERR, "maximum packet length must "
 				    "be larger than %u and smaller than %u,"
@@ -2628,12 +2629,14 @@ i40e_rx_queue_config(struct i40e_rx_queue *rxq)
 		}
 	} else {
 		if (rxq->max_pkt_len < RTE_ETHER_MIN_LEN ||
-			rxq->max_pkt_len > RTE_ETHER_MAX_LEN) {
+			rxq->max_pkt_len > RTE_ETHER_MAX_LEN +
+				I40E_VLAN_TAG_SIZE * 2) {
 			PMD_DRV_LOG(ERR, "maximum packet length must be "
 				    "larger than %u and smaller than %u, "
 				    "as jumbo frame is disabled",
 				    (uint32_t)RTE_ETHER_MIN_LEN,
-				    (uint32_t)RTE_ETHER_MAX_LEN);
+				    (uint32_t)RTE_ETHER_MAX_LEN +
+						I40E_VLAN_TAG_SIZE * 2);
 			return I40E_ERR_CONFIG;
 		}
 	}
diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index 7743205..f6722be 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -1257,11 +1257,17 @@ rte_eth_dev_configure(uint16_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,
 			goto rollback;
 		}
 	} else {
+		/**
+		 * The overhead from MTU to max frame size.
+		 * Considering VLAN and QinQ packet, the VLAN tag size
+		 * needs to be added to RTE_ETHER_MAX_LEN.
+		 */
 		if (dev_conf->rxmode.max_rx_pkt_len < RTE_ETHER_MIN_LEN ||
-			dev_conf->rxmode.max_rx_pkt_len > RTE_ETHER_MAX_LEN)
+			dev_conf->rxmode.max_rx_pkt_len > RTE_ETHER_MAX_LEN
+				+ RTE_ETHER_VLAN_LEN * 2)
 			/* Use default value */
 			dev->data->dev_conf.rxmode.max_rx_pkt_len =
-							RTE_ETHER_MAX_LEN;
+				RTE_ETHER_MAX_LEN + RTE_ETHER_VLAN_LEN * 2;
 	}
 
 	/* Any requested offloading must be within its device capabilities */
diff --git a/lib/librte_net/rte_ether.h b/lib/librte_net/rte_ether.h
index e069dc7..9c5eee7 100644
--- a/lib/librte_net/rte_ether.h
+++ b/lib/librte_net/rte_ether.h
@@ -26,6 +26,7 @@ extern "C" {
 #define RTE_ETHER_ADDR_LEN  6 /**< Length of Ethernet address. */
 #define RTE_ETHER_TYPE_LEN  2 /**< Length of Ethernet type field. */
 #define RTE_ETHER_CRC_LEN   4 /**< Length of Ethernet CRC. */
+#define RTE_ETHER_VLAN_LEN  4 /**< Length of Ethernet VLAN tag. */
 #define RTE_ETHER_HDR_LEN   \
 	(RTE_ETHER_ADDR_LEN * 2 + \
 		RTE_ETHER_TYPE_LEN) /**< Length of Ethernet header. */
-- 
2.7.4