netdev - Re: [net-next PATCH V3] octeontx2-af: Install TC filter rules in hardware based on priority

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Date: Wed, 19 Jul 2023 21:29:30 +0100
From: Simon Horman <simon.horman@...igine.com>
To: Suman Ghosh <sumang@...vell.com>
Cc: sgoutham@...vell.com, gakula@...vell.com, sbhatta@...vell.com,
	hkelam@...vell.com, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, lcherian@...vell.com,
	jerinj@...vell.com
Subject: Re: [net-next PATCH V3] octeontx2-af: Install TC filter rules in
 hardware based on priority

On Tue, Jul 18, 2023 at 10:10:49AM +0530, Suman Ghosh wrote:
> As of today, hardware does not support installing tc filter
> rules based on priority. This patch adds support to install
> the hardware rules based on priority. The final hardware rules
> will not be dependent on rule installation order, it will be strictly
> priority based, same as software.
> 
> Signed-off-by: Suman Ghosh <sumang@...vell.com>

...

> @@ -729,22 +816,106 @@ static int otx2_del_mcam_flow_entry(struct otx2_nic *nic, u16 entry)
>  		mutex_unlock(&nic->mbox.lock);
>  		return -EFAULT;
>  	}
> +
> +	if (cntr_val) {
> +		rsp = (struct npc_delete_flow_rsp *)otx2_mbox_get_rsp(&nic->mbox.mbox,
> +								      0, &req->hdr);
> +		*cntr_val = rsp->cntr_val;

Hi Suman,

otx2_mbox_get_rsp may return an ERR_PTR.
Is it ok not to check that before dereferencing rsp?

> +	}
> +
>  	mutex_unlock(&nic->mbox.lock);
> +	return 0;
> +}

...