linux-kernel - RE: [PATCH v6 net-next] net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)

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Date:   Thu, 15 Apr 2021 18:14:09 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Wei Liu <liuwe@...rosoft.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "leon@...nel.org" <leon@...nel.org>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "bernd@...rovitsch.priv.at" <bernd@...rovitsch.priv.at>,
        "rdunlap@...radead.org" <rdunlap@...radead.org>,
        Shachar Raindel <shacharr@...rosoft.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
Subject: RE: [PATCH v6 net-next] net: mana: Add a driver for Microsoft Azure
 Network Adapter (MANA)

> From: Jakub Kicinski <kuba@...nel.org>
> Sent: Thursday, April 15, 2021 10:44 AM
>  ...
> On Wed, 14 Apr 2021 22:45:19 -0700 Dexuan Cui wrote:
> > +	buf = dma_alloc_coherent(gmi->dev, length, &dma_handle,
> > +				 GFP_KERNEL | __GFP_ZERO);
> 
> No need for GFP_ZERO, dma_alloc_coherent() zeroes the memory these days.

Yes, indeed. Will remove __GFP_ZERO.

> 
> > +static int mana_gd_register_irq(struct gdma_queue *queue,
> > +				const struct gdma_queue_spec *spec)
> > ...
> > +	struct gdma_irq_context *gic;
> > +
> > +	struct gdma_context *gc;
> 
> Why the empty line?

No good reason. Will remove this line. I'll check the whole patch
for similar issues.

> 
> > +	queue = kzalloc(sizeof(*queue), GFP_KERNEL);
> > +	if (!queue)
> > +		return -ENOMEM;
> > +
> > +	gmi = &queue->mem_info;
> > +	err = mana_gd_alloc_memory(gc, spec->queue_size, gmi);
> > +	if (err)
> > +		return err;
> 
> Leaks the memory from 'queue'?

Sorry. This should be a bug I introduced when moving arouond some code.

> Same code in mana_gd_create_mana_eq(), ...wq_cq(), etc.

Will fix all of them, and check for the code similar issues.

> > +int mana_do_attach(struct net_device *ndev, enum mana_attach_caller
> caller)
> > +{
> > +	struct mana_port_context *apc = netdev_priv(ndev);
> > +	struct gdma_dev *gd = apc->ac->gdma_dev;
> > +	u32 max_txq, max_rxq, max_queues;
> > +	int port_idx = apc->port_idx;
> > +	u32 num_indirect_entries;
> > +	int err;
> > +
> > +	if (caller == MANA_OPEN)
> > +		goto start_open;
> > +
> > +	err = mana_init_port_context(apc);
> > +	if (err)
> > +		return err;
> > +
> > +	err = mana_query_vport_cfg(apc, port_idx, &max_txq, &max_rxq,
> > +				   &num_indirect_entries);
> > +	if (err) {
> > +		netdev_err(ndev, "Failed to query info for vPort 0\n");
> > +		goto reset_apc;
> > +	}
> > +
> > +	max_queues = min_t(u32, max_txq, max_rxq);
> > +	if (apc->max_queues > max_queues)
> > +		apc->max_queues = max_queues;
> > +
> > +	if (apc->num_queues > apc->max_queues)
> > +		apc->num_queues = apc->max_queues;
> > +
> > +	memcpy(ndev->dev_addr, apc->mac_addr, ETH_ALEN);
> > +
> > +	if (caller == MANA_PROBE)
> > +		return 0;
> > +
> > +start_open:
> 
> Why keep this as a single function, there is no overlap between what's
> done for OPEN and PROBE, it seems.
> 
> Similarly detach should probably be split into clearly distinct parts.

Will improve the code. Thanks for the suggestion!

Thanks,
Dexuan