patch 'net/txgbe: fix traffic class priority configuration' has been queued to stable release 25.11.3

[Kevin Traynor]

Hi,

FYI, your patch has been queued to stable release 25.11.3

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 08/04/26. 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/kevintraynor/dpdk-stable

This queued commit can be viewed at:
https://github.com/kevintraynor/dpdk-stable/commit/4be768012a093579facec298289930996e7dc4fe

Thanks.

Kevin

---
>From 4be768012a093579facec298289930996e7dc4fe Mon Sep 17 00:00:00 2001
From: Zaiyu Wang <zaiyuwang at trustnetic.com>
Date: Wed, 24 Jun 2026 19:52:43 +0800
Subject: [PATCH] net/txgbe: fix traffic class priority configuration

[ upstream commit b1346e76bb641cc43f053c63f48b75f3333d375f ]

After applying the following testpmd command, 802.1Q packets with specific
priorities were not properly directed to the corresponding traffic classes:
    port config 0 dcb vt off 4 pfc off

The old driver had two issues:
1. The hardware uses a 4-bit mapping register per traffic class for
   priority-to-TC mapping, but the driver incorrectly configured it
   as 3 bits.
2. The DCB TX configuration mistakenly wrote to the RX register.

Fix both issues, ensuring that tc-prio mapping works as expected.
Additionally, remove the stale and inconsistent TXGBE_DCBUP2TC_DEC macro as
it has no callers.

Fixes: 8bdc7882f376 ("net/txgbe: support DCB")

Signed-off-by: Zaiyu Wang <zaiyuwang at trustnetic.com>
---
 drivers/net/txgbe/base/txgbe_dcb_hw.c | 2 +-
 drivers/net/txgbe/base/txgbe_regs.h   | 6 ++----
 drivers/net/txgbe/txgbe_rxtx.c        | 7 ++-----
 3 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/net/txgbe/base/txgbe_dcb_hw.c b/drivers/net/txgbe/base/txgbe_dcb_hw.c
index 75c91a6b6a..79e1da447b 100644
--- a/drivers/net/txgbe/base/txgbe_dcb_hw.c
+++ b/drivers/net/txgbe/base/txgbe_dcb_hw.c
@@ -155,5 +155,5 @@ s32 txgbe_dcb_config_tx_data_arbiter_raptor(struct txgbe_hw *hw, u16 *refill,
 		reg |= TXGBE_DCBUP2TC_MAP(i, map[i]);
 
-	wr32(hw, TXGBE_PBRXUP2TC, reg);
+	wr32(hw, TXGBE_PBTXUP2TC, reg);
 
 	/* Configure traffic class credits and priority */
diff --git a/drivers/net/txgbe/base/txgbe_regs.h b/drivers/net/txgbe/base/txgbe_regs.h
index 22c46e3d56..4aa62919b4 100644
--- a/drivers/net/txgbe/base/txgbe_regs.h
+++ b/drivers/net/txgbe/base/txgbe_regs.h
@@ -504,8 +504,6 @@
 #define   TXGBE_PBRXCTL_ST              MS(0, 0x1)
 #define   TXGBE_PBRXCTL_ENA             MS(31, 0x1)
-#define TXGBE_PBRXUP2TC                 0x019008
 #define TXGBE_PBTXUP2TC                 0x01C800
-#define   TXGBE_DCBUP2TC_MAP(tc, v)     LS(v, 3 * (tc), 0x7)
-#define   TXGBE_DCBUP2TC_DEC(tc, r)     RS(r, 3 * (tc), 0x7)
+#define   TXGBE_DCBUP2TC_MAP(tc, v)     LS(v, 4 * (tc), 0x7)
 #define TXGBE_PBRXSIZE(tc)              (0x019020 + (tc) * 4)
 #define   TXGBE_PBRXSIZE_KB(v)          LS(v, 10, 0x3FF)
@@ -1706,5 +1704,5 @@ enum txgbe_5tuple_protocol {
 
 #define TXGBE_RPUP2TC                   0x019008
-#define   TXGBE_RPUP2TC_UP_SHIFT        3
+#define   TXGBE_RPUP2TC_UP_SHIFT        4
 #define   TXGBE_RPUP2TC_UP_MASK         0x7
 
diff --git a/drivers/net/txgbe/txgbe_rxtx.c b/drivers/net/txgbe/txgbe_rxtx.c
index d5dcec3a2c..def7c3baf0 100644
--- a/drivers/net/txgbe/txgbe_rxtx.c
+++ b/drivers/net/txgbe/txgbe_rxtx.c
@@ -3379,9 +3379,6 @@ txgbe_vmdq_dcb_configure(struct rte_eth_dev *dev)
 	queue_mapping = 0;
 	for (i = 0; i < RTE_ETH_DCB_NUM_USER_PRIORITIES; i++)
-		/*
-		 * mapping is done with 3 bits per priority,
-		 * so shift by i*3 each time
-		 */
-		queue_mapping |= ((cfg->dcb_tc[i] & 0x07) << (i * 3));
+		queue_mapping |= ((cfg->dcb_tc[i] & TXGBE_RPUP2TC_UP_MASK) <<
+				  (i * TXGBE_RPUP2TC_UP_SHIFT));
 
 	wr32(hw, TXGBE_RPUP2TC, queue_mapping);
-- 
2.55.0

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2026-07-30 10:16:01.804082099 +0100
+++ 0010-net-txgbe-fix-traffic-class-priority-configuration.patch	2026-07-30 10:16:01.432990811 +0100
@@ -1 +1 @@
-From b1346e76bb641cc43f053c63f48b75f3333d375f Mon Sep 17 00:00:00 2001
+From 4be768012a093579facec298289930996e7dc4fe Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit b1346e76bb641cc43f053c63f48b75f3333d375f ]
+
@@ -21 +22,0 @@
-Cc: stable at dpdk.org
@@ -63 +64 @@
-index 906ff16b67..42baaa3ab1 100644
+index d5dcec3a2c..def7c3baf0 100644