linux-kernel - [PATCH 4.4 023/192] [PATCH 023/135] fm10k: reinitialize queuing scheme after calling init

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Date:   Mon, 12 Sep 2016 18:58:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jacob Keller <jacob.e.keller@...el.com>,
        Bruce Allan <bruce.w.allan@...el.com>,
        Krishneil Singh <Krishneil.k.singh@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.4 023/192] [PATCH 023/135] fm10k: reinitialize queuing scheme after calling init_hw

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 875328e4bce696e85edcda3c4b0ec80fd525e3a3 ]

The init_hw function may fail, and in the case of VFs, it might change
the number of maximum queues available. Thus, for every flow which
checks init_hw, we need to ensure that we clear the queue scheme before,
and initialize it after. The fm10k_io_slot_reset path will end up
triggering a reset so fm10k_reinit needs this change. The
fm10k_io_error_detected and fm10k_io_resume also need to properly clear
and reinitialize the queue scheme.

Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
Reviewed-by: Bruce Allan <bruce.w.allan@...el.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/intel/fm10k/fm10k_pci.c |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

--- a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
@@ -159,6 +159,9 @@ static void fm10k_reinit(struct fm10k_in
 
 	fm10k_mbx_free_irq(interface);
 
+	/* free interrupts */
+	fm10k_clear_queueing_scheme(interface);
+
 	/* delay any future reset requests */
 	interface->last_reset = jiffies + (10 * HZ);
 
@@ -175,6 +178,12 @@ static void fm10k_reinit(struct fm10k_in
 		goto reinit_err;
 	}
 
+	err = fm10k_init_queueing_scheme(interface);
+	if (err) {
+		dev_err(&interface->pdev->dev, "init_queueing_scheme failed: %d\n", err);
+		goto reinit_err;
+	}
+
 	/* reassociate interrupts */
 	fm10k_mbx_request_irq(interface);
 
@@ -2205,6 +2214,9 @@ static pci_ers_result_t fm10k_io_error_d
 	if (netif_running(netdev))
 		fm10k_close(netdev);
 
+	/* free interrupts */
+	fm10k_clear_queueing_scheme(interface);
+
 	fm10k_mbx_free_irq(interface);
 
 	pci_disable_device(pdev);
@@ -2277,6 +2289,12 @@ static void fm10k_io_resume(struct pci_d
 	/* reset statistics starting values */
 	hw->mac.ops.rebind_hw_stats(hw, &interface->stats);
 
+	err = fm10k_init_queueing_scheme(interface);
+	if (err) {
+		dev_err(&interface->pdev->dev, "init_queueing_scheme failed: %d\n", err);
+		return;
+	}
+
 	/* reassociate interrupts */
 	fm10k_mbx_request_irq(interface);