linux-kernel - Re: [net-next Patch v5 5/6] octeontx2-pf: Add support for HTB offload

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Date:   Wed, 29 Mar 2023 16:44:21 +0000
From:   Hariprasad Kelam <hkelam@...vell.com>
To:     Paolo Abeni <pabeni@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "kuba@...nel.org" <kuba@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "willemdebruijn.kernel@...il.com" <willemdebruijn.kernel@...il.com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        Sunil Kovvuri Goutham <sgoutham@...vell.com>,
        Linu Cherian <lcherian@...vell.com>,
        Geethasowjanya Akula <gakula@...vell.com>,
        Jerin Jacob Kollanukkaran <jerinj@...vell.com>,
        Subbaraya Sundeep Bhatta <sbhatta@...vell.com>,
        "naveenm@...vel.com" <naveenm@...vel.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "jhs@...atatu.com" <jhs@...atatu.com>,
        "xiyou.wangcong@...il.com" <xiyou.wangcong@...il.com>,
        "jiri@...nulli.us" <jiri@...nulli.us>,
        "maxtram95@...il.com" <maxtram95@...il.com>
Subject: Re: [net-next Patch v5 5/6] octeontx2-pf: Add support for HTB offload



> On Sun, 2023-03-26 at 23:42 +0530, Hariprasad Kelam wrote:
> [...]
> > +static int otx2_qos_root_add(struct otx2_nic *pfvf, u16 htb_maj_id, u16
> htb_defcls,
> > +			     struct netlink_ext_ack *extack) {
> > +	struct otx2_qos_cfg *new_cfg;
> > +	struct otx2_qos_node *root;
> > +	int err;
> > +
> > +	netdev_dbg(pfvf->netdev,
> > +		   "TC_HTB_CREATE: handle=0x%x defcls=0x%x\n",
> > +		   htb_maj_id, htb_defcls);
> > +
> > +	INIT_LIST_HEAD(&pfvf->qos.qos_tree);
> > +	mutex_init(&pfvf->qos.qos_lock);
> 
> It's quite strange and error prone dynamically init this mutex and the list
> here. Why don't you do such init ad device creation time?
ACK,  we can safely move this logic in device init.
Will add these changes in next version.
> 
> > +
> > +	root = otx2_qos_alloc_root(pfvf);
> > +	if (IS_ERR(root)) {
> > +		mutex_destroy(&pfvf->qos.qos_lock);
> > +		err = PTR_ERR(root);
> > +		return err;
> > +	}
> > +
> > +	/* allocate txschq queue */
> > +	new_cfg = kzalloc(sizeof(*new_cfg), GFP_KERNEL);
> > +	if (!new_cfg) {
> > +		NL_SET_ERR_MSG_MOD(extack, "Memory allocation
> error");
> 
> Here the root node is leaked.
ACK, will address this issue in next version.

Thanks,
Hariprasad k
> 
> > +		mutex_destroy(&pfvf->qos.qos_lock);
> > +		return -ENOMEM;
> > +	}
> 
> 
> [...]
> 
> Cheers,
> 
> Paolo