netdev - RE: [PATCH net] qede: fix interrupt coalescing configuration

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Date:   Thu, 16 Feb 2023 12:40:37 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Manish Chopra' <manishc@...vell.com>,
        "kuba@...nel.org" <kuba@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "aelior@...vell.com" <aelior@...vell.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Bhaskar Upadhaya <bupadhaya@...vell.com>,
        "David S . Miller" <davem@...emloft.net>
Subject: RE: [PATCH net] qede: fix interrupt coalescing configuration

From: Manish Chopra
> Sent: 16 February 2023 11:55
> 
> On default driver load device gets configured with unexpected
> higher interrupt coalescing values instead of default expected
> values as memory allocated from krealloc() is not supposed to
> be zeroed out and may contain garbage values.
> 
> Fix this by allocating the memory of required size first with
> kcalloc() and then use krealloc() to resize and preserve the
> contents across down/up of the interface.

Doesn't any extra memory allocated by krealloc() need to
be zerod ?

	David

> 
> Signed-off-by: Manish Chopra <manishc@...vell.com>
> Fixes: b0ec5489c480 ("qede: preserve per queue stats across up/down of interface")
> Cc: stable@...r.kernel.org
> Cc: Bhaskar Upadhaya <bupadhaya@...vell.com>
> Cc: David S. Miller <davem@...emloft.net>
> Link: https://bugzilla.redhat.com/show_bug.cgi?id=2160054
> Signed-off-by: Alok Prasad <palok@...vell.com>
> Signed-off-by: Ariel Elior <aelior@...vell.com>
> ---
>  drivers/net/ethernet/qlogic/qede/qede_main.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c
> b/drivers/net/ethernet/qlogic/qede/qede_main.c
> index 953f304b8588..af39513db1ba 100644
> --- a/drivers/net/ethernet/qlogic/qede/qede_main.c
> +++ b/drivers/net/ethernet/qlogic/qede/qede_main.c
> @@ -970,8 +970,15 @@ static int qede_alloc_fp_array(struct qede_dev *edev)
>  		goto err;
>  	}
> 
> -	mem = krealloc(edev->coal_entry, QEDE_QUEUE_CNT(edev) *
> -		       sizeof(*edev->coal_entry), GFP_KERNEL);
> +	if (!edev->coal_entry) {
> +		mem = kcalloc(QEDE_MAX_RSS_CNT(edev),
> +			      sizeof(*edev->coal_entry), GFP_KERNEL);
> +	} else {
> +		mem = krealloc(edev->coal_entry,
> +			       QEDE_QUEUE_CNT(edev) * sizeof(*edev->coal_entry),
> +			       GFP_KERNEL);
> +	}
> +
>  	if (!mem) {
>  		DP_ERR(edev, "coalesce entry allocation failed\n");
>  		kfree(edev->coal_entry);
> --
> 2.27.0

-
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