linux-kernel - RE: [PATCH 4.18 101/135] hv_netvsc: pair VF based on serial number

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Message-ID: <DM5PR2101MB10138BCFD40D703FEE14EC35CAFE0@DM5PR2101MB1013.namprd21.prod.outlook.com>
Date:   Tue, 16 Oct 2018 19:13:12 +0000
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: RE: [PATCH 4.18 101/135] hv_netvsc: pair VF based on serial number



> -----Original Message-----
> From: linux-kernel-owner@...r.kernel.org <linux-kernel-
> owner@...r.kernel.org> On Behalf Of Greg Kroah-Hartman
> Sent: Tuesday, October 16, 2018 1:06 PM
> To: linux-kernel@...r.kernel.org
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>;
> stable@...r.kernel.org; Stephen Hemminger <sthemmin@...rosoft.com>;
> David S. Miller <davem@...emloft.net>; Sasha Levin
> <Alexander.Levin@...rosoft.com>
> Subject: [PATCH 4.18 101/135] hv_netvsc: pair VF based on serial number
> 
> 4.18-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Stephen Hemminger <stephen@...workplumber.org>
> 
> [ Upstream commit 00d7ddba1143623b31bc2c15d18216e2da031b14 ]
> 
> Matching network device based on MAC address is problematic since a non VF
> network device can be creted with a duplicate MAC address causing confusion
> and problems.  The VMBus API does provide a serial number that is a better
> matching method.
> 
> Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com>
> Signed-off-by: David S. Miller <davem@...emloft.net>
> Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/net/hyperv/netvsc.c     |    3 ++
>  drivers/net/hyperv/netvsc_drv.c |   58 ++++++++++++++++++++++-----------------
> -
>  2 files changed, 36 insertions(+), 25 deletions(-)
> 
> --- a/drivers/net/hyperv/netvsc.c
> +++ b/drivers/net/hyperv/netvsc.c
> @@ -1203,6 +1203,9 @@ static void netvsc_send_vf(struct net_de
> 
>  	net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
>  	net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
> +	netdev_info(ndev, "VF slot %u %s\n",
> +		    net_device_ctx->vf_serial,
> +		    net_device_ctx->vf_alloc ? "added" : "removed");
>  }
> 
>  static  void netvsc_receive_inband(struct net_device *ndev,
> --- a/drivers/net/hyperv/netvsc_drv.c
> +++ b/drivers/net/hyperv/netvsc_drv.c
> @@ -1794,20 +1794,6 @@ out_unlock:
>  	rtnl_unlock();
>  }
> 
> -static struct net_device *get_netvsc_bymac(const u8 *mac) -{
> -	struct net_device_context *ndev_ctx;
> -
> -	list_for_each_entry(ndev_ctx, &netvsc_dev_list, list) {
> -		struct net_device *dev = hv_get_drvdata(ndev_ctx-
> >device_ctx);
> -
> -		if (ether_addr_equal(mac, dev->perm_addr))
> -			return dev;
> -	}
> -
> -	return NULL;
> -}
> -
>  static struct net_device *get_netvsc_byref(struct net_device *vf_netdev)  {
>  	struct net_device_context *net_device_ctx; @@ -1936,26 +1922,48
> @@ static void netvsc_vf_setup(struct work_
>  	rtnl_unlock();
>  }
> 
> +/* Find netvsc by VMBus serial number.
> + * The PCI hyperv controller records the serial number as the slot.
> + */
> +static struct net_device *get_netvsc_byslot(const struct net_device
> +*vf_netdev) {
> +	struct device *parent = vf_netdev->dev.parent;
> +	struct net_device_context *ndev_ctx;
> +	struct pci_dev *pdev;
> +
> +	if (!parent || !dev_is_pci(parent))
> +		return NULL; /* not a PCI device */
> +
> +	pdev = to_pci_dev(parent);
> +	if (!pdev->slot) {
> +		netdev_notice(vf_netdev, "no PCI slot information\n");
> +		return NULL;
> +	}
> +
> +	list_for_each_entry(ndev_ctx, &netvsc_dev_list, list) {
> +		if (!ndev_ctx->vf_alloc)
> +			continue;
> +
> +		if (ndev_ctx->vf_serial == pdev->slot->number)
> +			return hv_get_drvdata(ndev_ctx->device_ctx);

Greg,

I had a fix to this patch. If not already, Could you include my following fix together?
hv_netvsc: fix vf serial matching with pci slot info
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?id=005479556197f80139771960dda0dfdcd2d2aad5

Thanks,
- Haiyang