netdev - [PATCH net 1/5] bnxt_en: Shutdown FW DMA in bnxt

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Message-ID: <20251104005700.542174-2-michael.chan@broadcom.com>
Date: Mon,  3 Nov 2025 16:56:55 -0800
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	andrew+netdev@...n.ch,
	pavan.chebbi@...adcom.com,
	andrew.gospodarek@...adcom.com,
	Jakub Kicinski <kicinski@...a.com>,
	Damodharam Ammepalli <damodharam.ammepalli@...adcom.com>,
	Kalesh AP <kalesh-anakkur.purayil@...adcom.com>,
	Somnath Kotur <somnath.kotur@...adcom.com>
Subject: [PATCH net 1/5] bnxt_en: Shutdown FW DMA in bnxt_shutdown()

The netif_close() call in bnxt_shutdown() only stops packet DMA.  There
may be FW DMA for trace logging (recently added) that will continue.  If
we kexec to a new kernel, the DMA will corrupt memory in the new kernel.

Add bnxt_hwrm_func_drv_unrgtr() to unregister the driver from the FW.
This will stop the FW DMA.  In case the call fails, call pcie_flr() to
reset the function and stop the DMA.

Fixes: 24d694aec139 ("bnxt_en: Allocate backing store memory for FW trace logs")
Reported-by: Jakub Kicinski <kicinski@...a.com>
Reviewed-by: Damodharam Ammepalli <damodharam.ammepalli@...adcom.com>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@...adcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 3fc33b1b4dfb..c0e9caa1df73 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -16892,6 +16892,10 @@ static void bnxt_shutdown(struct pci_dev *pdev)
 	if (netif_running(dev))
 		netif_close(dev);
 
+	if (bnxt_hwrm_func_drv_unrgtr(bp)) {
+		pcie_flr(pdev);
+		goto shutdown_exit;
+	}
 	bnxt_ptp_clear(bp);
 	bnxt_clear_int_mode(bp);
 	pci_disable_device(pdev);
-- 
2.51.0