linux-kernel - [PATCH net-next] net: mana: Add handler for hardware servicing events

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Message-Id: <1746633519-17549-1-git-send-email-haiyangz@microsoft.com>
Date: Wed,  7 May 2025 08:58:39 -0700
From: Haiyang Zhang <haiyangz@...rosoft.com>
To: linux-hyperv@...r.kernel.org,
	netdev@...r.kernel.org
Cc: haiyangz@...rosoft.com,
	decui@...rosoft.com,
	stephen@...workplumber.org,
	kys@...rosoft.com,
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	linux-kernel@...r.kernel.org
Subject: [PATCH net-next] net: mana: Add handler for hardware servicing events

To collaborate with hardware servicing events, upon receiving the special
EQE notification from the HW channel, remove the devices on this bus.
Then, after a waiting period based on the device specs, rescan the parent
bus to recover the devices.

Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
 .../net/ethernet/microsoft/mana/gdma_main.c   | 61 +++++++++++++++++++
 include/net/mana/gdma.h                       |  5 +-
 2 files changed, 65 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index 4ffaf7588885..aa2ccf4d0ec6 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
@@ -352,11 +352,52 @@ void mana_gd_ring_cq(struct gdma_queue *cq, u8 arm_bit)
 }
 EXPORT_SYMBOL_NS(mana_gd_ring_cq, "NET_MANA");
 
+#define MANA_SERVICE_PERIOD 10
+
+struct mana_serv_work {
+	struct work_struct serv_work;
+	struct pci_dev *pdev;
+};
+
+static void mana_serv_func(struct work_struct *w)
+{
+	struct mana_serv_work *mns_wk = container_of(w, struct mana_serv_work, serv_work);
+	struct pci_dev *pdev = mns_wk->pdev;
+	struct pci_bus *bus, *parent;
+
+	if (!pdev)
+		goto out;
+
+	bus = pdev->bus;
+	if (!bus) {
+		dev_err(&pdev->dev, "MANA service: no bus\n");
+		goto out;
+	}
+
+	parent = bus->parent;
+	if (!parent) {
+		dev_err(&pdev->dev, "MANA service: no parent bus\n");
+		goto out;
+	}
+
+	pci_stop_and_remove_bus_device_locked(bus->self);
+
+	msleep(MANA_SERVICE_PERIOD * 1000);
+
+	pci_lock_rescan_remove();
+	pci_rescan_bus(parent);
+	pci_unlock_rescan_remove();
+
+out:
+	kfree(mns_wk);
+}
+
 static void mana_gd_process_eqe(struct gdma_queue *eq)
 {
 	u32 head = eq->head % (eq->queue_size / GDMA_EQE_SIZE);
 	struct gdma_context *gc = eq->gdma_dev->gdma_context;
 	struct gdma_eqe *eq_eqe_ptr = eq->queue_mem_ptr;
+	struct mana_serv_work *mns_wk;
 	union gdma_eqe_info eqe_info;
 	enum gdma_eqe_type type;
 	struct gdma_event event;
@@ -400,6 +441,26 @@ static void mana_gd_process_eqe(struct gdma_queue *eq)
 		eq->eq.callback(eq->eq.context, eq, &event);
 		break;
 
+	case GDMA_EQE_HWC_FPGA_RECONFIG:
+	case GDMA_EQE_HWC_SOCMANA_CRASH:
+		if (gc->in_service) {
+			dev_info(gc->dev, "Already in service\n");
+			break;
+		}
+
+		mns_wk = kzalloc(sizeof(*mns_wk), GFP_ATOMIC);
+		if (!mns_wk) {
+			dev_err(gc->dev, "Fail to alloc mana_serv_work\n");
+			break;
+		}
+
+		dev_info(gc->dev, "Start MANA service\n");
+		gc->in_service = true;
+		mns_wk->pdev = to_pci_dev(gc->dev);
+		INIT_WORK(&mns_wk->serv_work, mana_serv_func);
+		schedule_work(&mns_wk->serv_work);
+		break;
+
 	default:
 		break;
 	}
diff --git a/include/net/mana/gdma.h b/include/net/mana/gdma.h
index 228603bf03f2..13cfbcf67815 100644
--- a/include/net/mana/gdma.h
+++ b/include/net/mana/gdma.h
@@ -58,8 +58,9 @@ enum gdma_eqe_type {
 	GDMA_EQE_HWC_INIT_EQ_ID_DB	= 129,
 	GDMA_EQE_HWC_INIT_DATA		= 130,
 	GDMA_EQE_HWC_INIT_DONE		= 131,
-	GDMA_EQE_HWC_SOC_RECONFIG	= 132,
+	GDMA_EQE_HWC_FPGA_RECONFIG	= 132,
 	GDMA_EQE_HWC_SOC_RECONFIG_DATA	= 133,
+	GDMA_EQE_HWC_SOCMANA_CRASH	= 135,
 	GDMA_EQE_RNIC_QP_FATAL		= 176,
 };
 
@@ -388,6 +389,8 @@ struct gdma_context {
 	u32			test_event_eq_id;
 
 	bool			is_pf;
+	bool			in_service;
+
 	phys_addr_t		bar0_pa;
 	void __iomem		*bar0_va;
 	void __iomem		*shm_base;
-- 
2.34.1