linux-kernel - Re: [PATCH v4] hv_netvsc: Allocate rx indirection table size dynamically

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Message-ID: <ZHd21sKJ+k/P0c9r@corigine.com>
Date:   Wed, 31 May 2023 18:33:26 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Shradha Gupta <shradhagupta@...ux.microsoft.com>
Cc:     linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org,
        netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Long Li <longli@...rosoft.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        "David S. Miller" <davem@...emloft.net>,
        Steen Hegelund <steen.hegelund@...rochip.com>
Subject: Re: [PATCH v4] hv_netvsc: Allocate rx indirection table size
 dynamically

On Tue, May 30, 2023 at 08:14:53PM -0700, Shradha Gupta wrote:
> Allocate the size of rx indirection table dynamically in netvsc
> from the value of size provided by OID_GEN_RECEIVE_SCALE_CAPABILITIES
> query instead of using a constant value of ITAB_NUM.
> 
> Signed-off-by: Shradha Gupta <shradhagupta@...ux.microsoft.com>
> Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
> Tested-on: Ubuntu22 (azure VM, SKU size: Standard_F72s_v2)
> Testcases:
> 1. ethtool -x eth0 output
> 2. LISA testcase:PERF-NETWORK-TCP-THROUGHPUT-MULTICONNECTION-NTTTCP-Synthetic

...

> @@ -1596,11 +1609,17 @@ void rndis_filter_device_remove(struct hv_device *dev,
>  				struct netvsc_device *net_dev)
>  {
>  	struct rndis_device *rndis_dev = net_dev->extension;
> +	struct net_device *net = hv_get_drvdata(dev);
> +	struct net_device_context *ndc = netdev_priv(net);

nit: I know this file doesn't follow the scheme very closely,
     but I'd preferred if it moved towards it.

     Please use reverse xmas tree - longest line to shortest -
     for local variable declarations in networking code.

	struct rndis_device *rndis_dev = net_dev->extension;
	struct net_device *net = hv_get_drvdata(dev);
	struct net_device_context *ndc;

	ndc = netdev_priv(net);

>  
>  	/* Halt and release the rndis device */
>  	rndis_filter_halt_device(net_dev, rndis_dev);
>  
>  	netvsc_device_remove(dev);
> +
> +	ndc->rx_table_sz = 0;
> +	kfree(ndc->rx_table);
> +	ndc->rx_table = NULL;
>  }

-- 
pw-bot: cr