[dpdk-stable] [PATCH 19.11] net/ice: fix jumbo frame flag condition

[Steve Yang]

[ upstream commit 14801aa3fb3587347c739d6e55afdbe130f319be ]

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: 84dc7a95a2d3 ("net/ice: enable flow director engine")
Fixes: 1b009275e2c8 ("net/ice: add Rx queue init in DCF")
Fixes: ae2bdd0219cb ("net/ice: support MTU setting")
Fixes: 50370662b727 ("net/ice: support device and queue ops")
Cc: stable at dpdk.org

Reviewed-by: Ferruh Yigit <ferruh.yigit at intel.com>

Signed-off-by: Steve Yang <stevex.yang at intel.com>
---
 drivers/net/ice/ice_ethdev.c |  2 +-
 drivers/net/ice/ice_ethdev.h |  1 +
 drivers/net/ice/ice_rxtx.c   | 10 +++++-----
 3 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ice/ice_ethdev.c b/drivers/net/ice/ice_ethdev.c
index 8acfce00aa..4e685f7726 100644
--- a/drivers/net/ice/ice_ethdev.c
+++ b/drivers/net/ice/ice_ethdev.c
@@ -3239,7 +3239,7 @@ ice_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 		return -EBUSY;
 	}
 
-	if (frame_size > RTE_ETHER_MAX_LEN)
+	if (frame_size > ICE_ETH_MAX_LEN)
 		dev_data->dev_conf.rxmode.offloads |=
 			DEV_RX_OFFLOAD_JUMBO_FRAME;
 	else
diff --git a/drivers/net/ice/ice_ethdev.h b/drivers/net/ice/ice_ethdev.h
index 070c3ae306..cce0b5f2d6 100644
--- a/drivers/net/ice/ice_ethdev.h
+++ b/drivers/net/ice/ice_ethdev.h
@@ -123,6 +123,7 @@
  */
 #define ICE_ETH_OVERHEAD \
 	(RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN + ICE_VLAN_TAG_SIZE * 2)
+#define ICE_ETH_MAX_LEN (RTE_ETHER_MTU + ICE_ETH_OVERHEAD)
 
 #define ICE_RXTX_BYTES_HIGH(bytes) ((bytes) & ~ICE_40_BIT_MASK)
 #define ICE_RXTX_BYTES_LOW(bytes) ((bytes) & ICE_40_BIT_MASK)
diff --git a/drivers/net/ice/ice_rxtx.c b/drivers/net/ice/ice_rxtx.c
index 3030550bdc..fd59f3f1c2 100644
--- a/drivers/net/ice/ice_rxtx.c
+++ b/drivers/net/ice/ice_rxtx.c
@@ -85,23 +85,23 @@ ice_program_hw_rx_queue(struct ice_rx_queue *rxq)
 				   dev->data->dev_conf.rxmode.max_rx_pkt_len);
 
 	if (rxmode->offloads & DEV_RX_OFFLOAD_JUMBO_FRAME) {
-		if (rxq->max_pkt_len <= RTE_ETHER_MAX_LEN ||
+		if (rxq->max_pkt_len <= ICE_ETH_MAX_LEN ||
 		    rxq->max_pkt_len > ICE_FRAME_SIZE_MAX) {
 			PMD_DRV_LOG(ERR, "maximum packet length must "
 				    "be larger than %u and smaller than %u,"
 				    "as jumbo frame is enabled",
-				    (uint32_t)RTE_ETHER_MAX_LEN,
+				    (uint32_t)ICE_ETH_MAX_LEN,
 				    (uint32_t)ICE_FRAME_SIZE_MAX);
 			return -EINVAL;
 		}
 	} else {
 		if (rxq->max_pkt_len < RTE_ETHER_MIN_LEN ||
-		    rxq->max_pkt_len > RTE_ETHER_MAX_LEN) {
+		    rxq->max_pkt_len > ICE_ETH_MAX_LEN) {
 			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)ICE_ETH_MAX_LEN);
 			return -EINVAL;
 		}
 	}
@@ -530,7 +530,7 @@ ice_fdir_program_hw_rx_queue(struct ice_rx_queue *rxq)
 	rx_ctx.hbuf = rxq->rx_hdr_len >> ICE_RLAN_CTX_HBUF_S;
 	rx_ctx.dtype = 0; /* No Header Split mode */
 	rx_ctx.dsize = 1; /* 32B descriptors */
-	rx_ctx.rxmax = RTE_ETHER_MAX_LEN;
+	rx_ctx.rxmax = ICE_ETH_MAX_LEN;
 	/* TPH: Transaction Layer Packet (TLP) processing hints */
 	rx_ctx.tphrdesc_ena = 1;
 	rx_ctx.tphwdesc_ena = 1;
-- 
2.17.1