linux-kernel - RE: [Patch v4 03/12] net: mana: Handle vport sharing between devices

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Date:   Mon, 11 Jul 2022 01:13:35 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Long Li <longli@...rosoft.com>, KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "shiraz.saleem@...el.com" <shiraz.saleem@...el.com>,
        Ajay Sharma <sharmaajay@...rosoft.com>
CC:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: RE: [Patch v4 03/12] net: mana: Handle vport sharing between devices

> From: longli@...uxonhyperv.com <longli@...uxonhyperv.com>
> Sent: Wednesday, June 15, 2022 7:07 PM
> +void mana_uncfg_vport(struct mana_port_context *apc)
> +{
> +	mutex_lock(&apc->vport_mutex);
> +	apc->vport_use_count--;
> +	WARN_ON(apc->vport_use_count < 0);
> +	mutex_unlock(&apc->vport_mutex);
> +}
> +EXPORT_SYMBOL_GPL(mana_uncfg_vport);
> +
> +int mana_cfg_vport(struct mana_port_context *apc, u32 protection_dom_id,
> +		   u32 doorbell_pg_id)
>  {
>  	struct mana_config_vport_resp resp = {};
>  	struct mana_config_vport_req req = {};
>  	int err;
> 
> +	/* Ethernet driver and IB driver can't take the port at the same time */
> +	mutex_lock(&apc->vport_mutex);
> +	if (apc->vport_use_count > 0) {
> +		mutex_unlock(&apc->vport_mutex);
> +		return -ENODEV;
Maybe -EBUSY is better?

> @@ -563,9 +581,19 @@ static int mana_cfg_vport(struct mana_port_context
> *apc, u32 protection_dom_id,
> 
>  	apc->tx_shortform_allowed = resp.short_form_allowed;
>  	apc->tx_vp_offset = resp.tx_vport_offset;
> +
> +	netdev_info(apc->ndev, "Configured vPort %llu PD %u DB %u\n",
> +		    apc->port_handle, protection_dom_id, doorbell_pg_id);
Should this be netdev_dbg()?
The log buffer can be flooded if there are many vPorts per VF PCI device and
there are a lot of VFs.

>  out:
> +	if (err) {
> +		mutex_lock(&apc->vport_mutex);
> +		apc->vport_use_count--;
> +		mutex_unlock(&apc->vport_mutex);
> +	}

Change this to the blelow?
    if (err)
        mana_uncfg_vport(apc);

> @@ -626,6 +654,9 @@ static int mana_cfg_vport_steering(struct
> mana_port_context *apc,
>  			   resp.hdr.status);
>  		err = -EPROTO;
>  	}
> +
> +	netdev_info(ndev, "Configured steering vPort %llu entries %u\n",
> +		    apc->port_handle, num_entries);

netdev_dbg()?

In general, the patch looks good to me.
Reviewed-by: Dexuan Cui <decui@...rosoft.com>