patch 'net/txgbe: restrict configuration of VLAN strip offload' has been queued to stable release 23.11.2

[Xueming Li]

Hi,

FYI, your patch has been queued to stable release 23.11.2

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 08/14/24. 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://git.dpdk.org/dpdk-stable/log/?h=23.11-staging

This queued commit can be viewed at:
https://git.dpdk.org/dpdk-stable/commit/?h=23.11-staging&id=55d8be2055f28556f418b6696fe0bd5145140289

Thanks.

Xueming Li <xuemingl at nvidia.com>

---
>From 55d8be2055f28556f418b6696fe0bd5145140289 Mon Sep 17 00:00:00 2001
From: Jiawen Wu <jiawenwu at trustnetic.com>
Date: Tue, 18 Jun 2024 15:11:35 +0800
Subject: [PATCH] net/txgbe: restrict configuration of VLAN strip offload
Cc: Xueming Li <xuemingl at nvidia.com>

[ upstream commit 66364efcf95884b97b71aaff697f8597a286f52e ]

There is a hardware limitation that Rx ring config register is not
writable when Rx ring is enabled, i.e. the TXGBE_RXCFG_ENA bit is set.
But disabling the ring when there is traffic will cause ring get stuck.
So restrict the configuration of VLAN strip offload only if device is
started.

Fixes: 220b0e49bc47 ("net/txgbe: support VLAN")

Signed-off-by: Jiawen Wu <jiawenwu at trustnetic.com>
---
 drivers/net/txgbe/txgbe_ethdev.c | 49 +++++++++++++-------------------
 1 file changed, 20 insertions(+), 29 deletions(-)

diff --git a/drivers/net/txgbe/txgbe_ethdev.c b/drivers/net/txgbe/txgbe_ethdev.c
index af98762680..d1305b0507 100644
--- a/drivers/net/txgbe/txgbe_ethdev.c
+++ b/drivers/net/txgbe/txgbe_ethdev.c
@@ -1000,41 +1000,25 @@ txgbe_vlan_filter_set(struct rte_eth_dev *dev, uint16_t vlan_id, int on)
 }
 
 static void
-txgbe_vlan_strip_queue_set(struct rte_eth_dev *dev, uint16_t queue, int on)
+txgbe_vlan_strip_q_set(struct rte_eth_dev *dev, uint16_t queue, int on)
 {
-	struct txgbe_hw *hw = TXGBE_DEV_HW(dev);
-	struct txgbe_rx_queue *rxq;
-	bool restart;
-	uint32_t rxcfg, rxbal, rxbah;
-
 	if (on)
 		txgbe_vlan_hw_strip_enable(dev, queue);
 	else
 		txgbe_vlan_hw_strip_disable(dev, queue);
+}
 
-	rxq = dev->data->rx_queues[queue];
-	rxbal = rd32(hw, TXGBE_RXBAL(rxq->reg_idx));
-	rxbah = rd32(hw, TXGBE_RXBAH(rxq->reg_idx));
-	rxcfg = rd32(hw, TXGBE_RXCFG(rxq->reg_idx));
-	if (rxq->offloads & RTE_ETH_RX_OFFLOAD_VLAN_STRIP) {
-		restart = (rxcfg & TXGBE_RXCFG_ENA) &&
-			!(rxcfg & TXGBE_RXCFG_VLAN);
-		rxcfg |= TXGBE_RXCFG_VLAN;
-	} else {
-		restart = (rxcfg & TXGBE_RXCFG_ENA) &&
-			(rxcfg & TXGBE_RXCFG_VLAN);
-		rxcfg &= ~TXGBE_RXCFG_VLAN;
-	}
-	rxcfg &= ~TXGBE_RXCFG_ENA;
+static void
+txgbe_vlan_strip_queue_set(struct rte_eth_dev *dev, uint16_t queue, int on)
+{
+	struct txgbe_hw *hw = TXGBE_DEV_HW(dev);
 
-	if (restart) {
-		/* set vlan strip for ring */
-		txgbe_dev_rx_queue_stop(dev, queue);
-		wr32(hw, TXGBE_RXBAL(rxq->reg_idx), rxbal);
-		wr32(hw, TXGBE_RXBAH(rxq->reg_idx), rxbah);
-		wr32(hw, TXGBE_RXCFG(rxq->reg_idx), rxcfg);
-		txgbe_dev_rx_queue_start(dev, queue);
+	if (!hw->adapter_stopped) {
+		PMD_DRV_LOG(ERR, "Please stop port first");
+		return;
 	}
+
+	txgbe_vlan_strip_q_set(dev, queue, on);
 }
 
 static int
@@ -1259,9 +1243,9 @@ txgbe_vlan_hw_strip_config(struct rte_eth_dev *dev)
 		rxq = dev->data->rx_queues[i];
 
 		if (rxq->offloads & RTE_ETH_RX_OFFLOAD_VLAN_STRIP)
-			txgbe_vlan_strip_queue_set(dev, i, 1);
+			txgbe_vlan_strip_q_set(dev, i, 1);
 		else
-			txgbe_vlan_strip_queue_set(dev, i, 0);
+			txgbe_vlan_strip_q_set(dev, i, 0);
 	}
 }
 
@@ -1323,6 +1307,13 @@ txgbe_vlan_offload_config(struct rte_eth_dev *dev, int mask)
 static int
 txgbe_vlan_offload_set(struct rte_eth_dev *dev, int mask)
 {
+	struct txgbe_hw *hw = TXGBE_DEV_HW(dev);
+
+	if (!hw->adapter_stopped && (mask & RTE_ETH_VLAN_STRIP_MASK)) {
+		PMD_DRV_LOG(ERR, "Please stop port first");
+		return -EPERM;
+	}
+
 	txgbe_config_vlan_strip_on_all_queues(dev, mask);
 
 	txgbe_vlan_offload_config(dev, mask);
-- 
2.34.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2024-08-12 20:44:04.928433307 +0800
+++ 0073-net-txgbe-restrict-configuration-of-VLAN-strip-offlo.patch	2024-08-12 20:44:02.225069320 +0800
@@ -1 +1 @@
-From 66364efcf95884b97b71aaff697f8597a286f52e Mon Sep 17 00:00:00 2001
+From 55d8be2055f28556f418b6696fe0bd5145140289 Mon Sep 17 00:00:00 2001
@@ -4,0 +5,3 @@
+Cc: Xueming Li <xuemingl at nvidia.com>
+
+[ upstream commit 66364efcf95884b97b71aaff697f8597a286f52e ]
@@ -13 +15,0 @@
-Cc: stable at dpdk.org
@@ -21 +23 @@
-index 121dccb5eb..a59d964a5b 100644
+index af98762680..d1305b0507 100644