netdev - Re: [PATCH net-next v2] net: qualcomm: rmnet: Add side band flow control support

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Date: Wed, 27 Sep 2023 21:31:54 -0600
From: "Subash Abhinov Kasiviswanathan (KS)" <quic_subashab@...cinc.com>
To: Vadim Fedorenko <vadim.fedorenko@...ux.dev>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <netdev@...r.kernel.org>, <lkp@...el.com>
CC: Sean Tranchetti <quic_stranche@...cinc.com>
Subject: Re: [PATCH net-next v2] net: qualcomm: rmnet: Add side band flow
 control support



On 9/27/2023 6:12 PM, Vadim Fedorenko wrote:
> On 26/09/2023 19:24, Subash Abhinov Kasiviswanathan wrote:
>> Individual rmnet devices map to specific network types such as internet,
>> multimedia messaging services, IP multimedia subsystem etc. Each of
>> these network types may support varying quality of service for different
>> bearers or traffic types.
>>
> 
>> +static u16 rmnet_vnd_select_queue(struct net_device *dev,
>> +                  struct sk_buff *skb,
>> +                  struct net_device *sb_dev)
>> +{
>> +    struct rmnet_priv *priv = netdev_priv(dev);
>> +    void *p = xa_load(&priv->queue_map, skb->mark);
> 
> Reverse X-mas tree, please.

We need to get priv first though. Alternatively, i could do the 
following but it is just more verbose for the sake of the formatting.

	struct rmnet_priv *priv;
	void *p;

	priv = netdev_priv(dev);
	p = xa_load(&priv->queue_map, skb->mark);

> 
>> +    u8 txq;
>> +
>> +    if (!p || !xa_is_value(p))
>> +        return 0;
>> +
>> +    txq = xa_to_value(p);
>> +
>> +    netdev_dbg(dev, "mark %08x -> txq %02x\n", skb->mark, txq);
>> +    return txq;
>> +}
>> +
> 
>