patch 'net/hns3: fix VLAN tag loss for short tunnel frame' has been queued to stable release 22.11.11

[luca.boccassi@gmail.com]

Hi,

FYI, your patch has been queued to stable release 22.11.11

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 10/29/25. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/a93b0c242f9ec715d68fa676c74baa978ecdf0d1

Thanks.

Luca Boccassi

---
From a93b0c242f9ec715d68fa676c74baa978ecdf0d1 Mon Sep 17 00:00:00 2001
From: Xingui Yang <yangxingui@huawei.com>
Date: Mon, 29 Sep 2025 19:35:53 +0800
Subject: [PATCH] net/hns3: fix VLAN tag loss for short tunnel frame

[ upstream commit 2262fc29485bd863db55e820a194bf1e4be8a87c ]

When the hardware handles short tunnel frames below 65 bytes, the VLAN tag
will be lost if VLAN insert or QinQ insert is enabled. Therefore, the
packet size of the tunnel frame is padded to 65 bytes to fix this issue.

Fixes: de620754a109 ("net/hns3: fix sending packets less than 60 bytes")

Signed-off-by: Xingui Yang <yangxingui@huawei.com>
---
 drivers/net/hns3/hns3_ethdev.h |  1 +
 drivers/net/hns3/hns3_rxtx.c   | 48 +++++++++++++++++++++++-----------
 2 files changed, 34 insertions(+), 15 deletions(-)

diff --git a/drivers/net/hns3/hns3_ethdev.h b/drivers/net/hns3/hns3_ethdev.h
index 9ebf807202..864fb186b1 100644
--- a/drivers/net/hns3/hns3_ethdev.h
+++ b/drivers/net/hns3/hns3_ethdev.h
@@ -74,6 +74,7 @@
 #define HNS3_DEFAULT_MTU		1500UL
 #define HNS3_DEFAULT_FRAME_LEN		(HNS3_DEFAULT_MTU + HNS3_ETH_OVERHEAD)
 #define HNS3_HIP08_MIN_TX_PKT_LEN	33
+#define HNS3_MIN_TUN_PKT_LEN		65
 
 #define HNS3_BITS_PER_BYTE	8
 
diff --git a/drivers/net/hns3/hns3_rxtx.c b/drivers/net/hns3/hns3_rxtx.c
index 56060730b0..3256e12b63 100644
--- a/drivers/net/hns3/hns3_rxtx.c
+++ b/drivers/net/hns3/hns3_rxtx.c
@@ -4124,6 +4124,37 @@ hns3_tx_fill_hw_ring(struct hns3_tx_queue *txq,
 	}
 }
 
+static bool
+hns3_tx_pktmbuf_append(struct hns3_tx_queue *txq,
+		       struct rte_mbuf *tx_pkt)
+{
+	uint16_t add_len = 0;
+	uint32_t ptype;
+	char *appended;
+
+	if (unlikely(tx_pkt->ol_flags & (RTE_MBUF_F_TX_VLAN | RTE_MBUF_F_TX_QINQ) &&
+		rte_pktmbuf_pkt_len(tx_pkt) < HNS3_MIN_TUN_PKT_LEN)) {
+		ptype = rte_net_get_ptype(tx_pkt, NULL, RTE_PTYPE_L2_MASK |
+				RTE_PTYPE_L3_MASK | RTE_PTYPE_L4_MASK |
+				RTE_PTYPE_TUNNEL_MASK);
+		if (ptype & RTE_PTYPE_TUNNEL_MASK)
+			add_len = HNS3_MIN_TUN_PKT_LEN - rte_pktmbuf_pkt_len(tx_pkt);
+	} else if (unlikely(rte_pktmbuf_pkt_len(tx_pkt) < txq->min_tx_pkt_len)) {
+		add_len = txq->min_tx_pkt_len - rte_pktmbuf_pkt_len(tx_pkt);
+	}
+
+	if (unlikely(add_len > 0)) {
+		appended = rte_pktmbuf_append(tx_pkt, add_len);
+		if (appended == NULL) {
+			txq->dfx_stats.pkt_padding_fail_cnt++;
+			return false;
+		}
+		memset(appended, 0, add_len);
+	}
+
+	return true;
+}
+
 uint16_t
 hns3_xmit_pkts_simple(void *tx_queue,
 		      struct rte_mbuf **tx_pkts,
@@ -4201,21 +4232,8 @@ hns3_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 		 * by hardware in Tx direction, driver need to pad it to avoid
 		 * error.
 		 */
-		if (unlikely(rte_pktmbuf_pkt_len(tx_pkt) <
-						txq->min_tx_pkt_len)) {
-			uint16_t add_len;
-			char *appended;
-
-			add_len = txq->min_tx_pkt_len -
-					 rte_pktmbuf_pkt_len(tx_pkt);
-			appended = rte_pktmbuf_append(tx_pkt, add_len);
-			if (appended == NULL) {
-				txq->dfx_stats.pkt_padding_fail_cnt++;
-				break;
-			}
-
-			memset(appended, 0, add_len);
-		}
+		if (!hns3_tx_pktmbuf_append(txq, tx_pkt))
+			break;
 
 		m_seg = tx_pkt;
 
-- 
2.47.3

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2025-10-27 15:54:36.894420222 +0000
+++ 0057-net-hns3-fix-VLAN-tag-loss-for-short-tunnel-frame.patch	2025-10-27 15:54:34.835950552 +0000
@@ -1 +1 @@
-From 2262fc29485bd863db55e820a194bf1e4be8a87c Mon Sep 17 00:00:00 2001
+From a93b0c242f9ec715d68fa676c74baa978ecdf0d1 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 2262fc29485bd863db55e820a194bf1e4be8a87c ]
+
@@ -11 +12,0 @@
-Cc: stable@dpdk.org
@@ -20 +21 @@
-index f6bb1b5d43..209b042816 100644
+index 9ebf807202..864fb186b1 100644
@@ -23 +24 @@
-@@ -75,6 +75,7 @@
+@@ -74,6 +74,7 @@
@@ -32 +33 @@
-index aa7ee6f3e8..df703134be 100644
+index 56060730b0..3256e12b63 100644
@@ -35 +36 @@
-@@ -4219,6 +4219,37 @@ hns3_tx_fill_hw_ring(struct hns3_tx_queue *txq,
+@@ -4124,6 +4124,37 @@ hns3_tx_fill_hw_ring(struct hns3_tx_queue *txq,
@@ -73 +74 @@
-@@ -4296,21 +4327,8 @@ hns3_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
+@@ -4201,21 +4232,8 @@ hns3_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)