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    Subject[PATCH 4.18 203/235] net: mvpp2: make sure we use single queue mode on PPv2.1
    Date
    4.18-stable review patch.  If anyone has any objections, please let me know.

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

    From: Maxime Chevallier <maxime.chevallier@bootlin.com>

    [ Upstream commit 1e27a628e3f444f53ab8099dfb31c5156e38d112 ]

    The PPv2 driver defines 2 "queue_modes" :
    - QDIST_SINGLE_MODE, where each port share one rx queue vector
    between all CPUs
    - QDIST_MULTI_MODE, where each port has one rx queue vector per CPU.

    Multi queue mode isn't available on PPv2.1, make sure we fallback to
    single mode when running on this revision.

    Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 6 ++++++
    1 file changed, 6 insertions(+)

    --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
    +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
    @@ -5011,6 +5011,12 @@ static int mvpp2_probe(struct platform_d
    (unsigned long)of_device_get_match_data(&pdev->dev);
    }

    + /* multi queue mode isn't supported on PPV2.1, fallback to single
    + * mode
    + */
    + if (priv->hw_version == MVPP21)
    + queue_mode = MVPP2_QDIST_SINGLE_MODE;
    +
    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    base = devm_ioremap_resource(&pdev->dev, res);
    if (IS_ERR(base))

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