patch 'net/ngbe: fix interrupt lost in legacy or MSI mode' has been queued to stable release 22.11.7

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 22.11.7

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/14/24. 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://github.com/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/5e2ce50e415b5acbc641bde383f76ca27c02dedb

Thanks.

Luca Boccassi

---
>From 5e2ce50e415b5acbc641bde383f76ca27c02dedb Mon Sep 17 00:00:00 2001
From: Jiawen Wu <jiawenwu at trustnetic.com>
Date: Mon, 4 Nov 2024 10:30:06 +0800
Subject: [PATCH] net/ngbe: fix interrupt lost in legacy or MSI mode

[ upstream commit 68f04c0aa79316de333441e7efdadd2876412ffa ]

When interrupt is legacy or MSI mode, shared interrupt may cause the
interrupt cannot be re-enabled. So fix to read the shared interrupt.

Fixes: b9246b8fa280 ("net/ngbe: support link update")

Signed-off-by: Jiawen Wu <jiawenwu at trustnetic.com>
---
 drivers/net/ngbe/ngbe_ethdev.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/ngbe/ngbe_ethdev.c b/drivers/net/ngbe/ngbe_ethdev.c
index 5f39bd336b..38754ce0f0 100644
--- a/drivers/net/ngbe/ngbe_ethdev.c
+++ b/drivers/net/ngbe/ngbe_ethdev.c
@@ -2146,6 +2146,19 @@ ngbe_dev_interrupt_get_status(struct rte_eth_dev *dev)
 	struct ngbe_hw *hw = ngbe_dev_hw(dev);
 	struct ngbe_interrupt *intr = ngbe_dev_intr(dev);
 
+	eicr = ((u32 *)hw->isb_mem)[NGBE_ISB_VEC0];
+	if (!eicr) {
+		/*
+		 * shared interrupt alert!
+		 * make sure interrupts are enabled because the read will
+		 * have disabled interrupts.
+		 */
+		if (!hw->adapter_stopped)
+			ngbe_enable_intr(dev);
+		return 0;
+	}
+	((u32 *)hw->isb_mem)[NGBE_ISB_VEC0] = 0;
+
 	/* read-on-clear nic registers here */
 	eicr = ((u32 *)hw->isb_mem)[NGBE_ISB_MISC];
 	PMD_DRV_LOG(DEBUG, "eicr %x", eicr);
-- 
2.45.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2024-11-12 22:06:59.642832760 +0000
+++ 0030-net-ngbe-fix-interrupt-lost-in-legacy-or-MSI-mode.patch	2024-11-12 22:06:58.679307391 +0000
@@ -1 +1 @@
-From 68f04c0aa79316de333441e7efdadd2876412ffa Mon Sep 17 00:00:00 2001
+From 5e2ce50e415b5acbc641bde383f76ca27c02dedb Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 68f04c0aa79316de333441e7efdadd2876412ffa ]
+
@@ -10 +11,0 @@
-Cc: stable at dpdk.org
@@ -18 +19 @@
-index c372fd928c..325a9d1eaf 100644
+index 5f39bd336b..38754ce0f0 100644
@@ -21 +22 @@
-@@ -2193,6 +2193,19 @@ ngbe_dev_interrupt_get_status(struct rte_eth_dev *dev)
+@@ -2146,6 +2146,19 @@ ngbe_dev_interrupt_get_status(struct rte_eth_dev *dev)