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Date:   Fri, 18 Nov 2022 13:46:29 +0000
From:   "Jankowski, Konrad0" <konrad0.jankowski@...el.com>
To:     Stefan Assmann <sassmann@...nic.de>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Piotrowski, Patryk" <patryk.piotrowski@...el.com>
Subject: RE: [Intel-wired-lan] [PATCH net] iavf: remove INITIAL_MAC_SET to
 allow gARP to work properly



> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of Stefan
> Assmann
> Sent: Thursday, November 10, 2022 3:15 PM
> To: intel-wired-lan@...ts.osuosl.org
> Cc: netdev@...r.kernel.org; Piotrowski, Patryk <patryk.piotrowski@...el.com>;
> sassmann@...nic.de
> Subject: [Intel-wired-lan] [PATCH net] iavf: remove INITIAL_MAC_SET to allow
> gARP to work properly
> 
> IAVF_FLAG_INITIAL_MAC_SET prevents waiting on iavf_is_mac_set_handled()
> the first time the MAC is set. This breaks gratuitous ARP because the MAC
> address has not been updated yet when the gARP packet is sent out.
> 
> Current behaviour:
> $ echo 1 > /sys/class/net/ens4f0/device/sriov_numvfs
> iavf 0000:88:02.0: MAC address: ee:04:19:14:ec:ea $ ip addr add 192.168.1.1/24
> dev ens4f0v0 $ ip link set dev ens4f0v0 up $ echo 1 >
> /proc/sys/net/ipv4/conf/ens4f0v0/arp_notify
> $ ip link set ens4f0v0 addr 00:11:22:33:44:55
> 07:23:41.676611 ee:04:19:14:ec:ea > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806),
> length 42: Request who-has 192.168.1.1 tell 192.168.1.1, length 28
> 
> With IAVF_FLAG_INITIAL_MAC_SET removed:
> $ echo 1 > /sys/class/net/ens4f0/device/sriov_numvfs
> iavf 0000:88:02.0: MAC address: 3e:8a:16:a2:37:6d $ ip addr add 192.168.1.1/24
> dev ens4f0v0 $ ip link set dev ens4f0v0 up $ echo 1 >
> /proc/sys/net/ipv4/conf/ens4f0v0/arp_notify
> $ ip link set ens4f0v0 addr 00:11:22:33:44:55
> 07:28:01.836608 00:11:22:33:44:55 > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806),
> length 42: Request who-has 192.168.1.1 tell 192.168.1.1, length 28
> 
> Fixes: 35a2443d0910 ("iavf: Add waiting for response from PF in set mac")
> Signed-off-by: Stefan Assmann <sassmann@...nic.de>
> ---
>  drivers/net/ethernet/intel/iavf/iavf.h      | 1 -
>  drivers/net/ethernet/intel/iavf/iavf_main.c | 8 --------
>  2 files changed, 9 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/iavf/iavf.h
> b/drivers/net/ethernet/intel/iavf/iavf.h
> index 3f6187c16424..0d1bab4ac1b0 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf.h
> +++ b/drivers/net/ethernet/intel/iavf/iavf.h

Tested-by: Konrad Jankowski <konrad0.jankowski@...el.com>

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