linux-kernel - Re: [PATCH net-next 1/4] net: xilinx: axienet: Always disable promiscuous mode

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Message-ID: <9d67d2b0-e4bd-466a-ad60-e40d4b1fc4e7@linux.dev>
Date: Thu, 15 Aug 2024 11:14:41 -0400
From: Sean Anderson <sean.anderson@...ux.dev>
To: Simon Horman <horms@...nel.org>
Cc: Radhey Shyam Pandey <radhey.shyam.pandey@....com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 Andrew Lunn <andrew@...n.ch>, Michal Simek <michal.simek@....com>,
 Daniel Borkmann <daniel@...earbox.net>, Paolo Abeni <pabeni@...hat.com>,
 "David S . Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, linux-arm-kernel@...ts.infradead.org,
 Jakub Kicinski <kuba@...nel.org>,
 Ariane Keller <ariane.keller@....ee.ethz.ch>
Subject: Re: [PATCH net-next 1/4] net: xilinx: axienet: Always disable
 promiscuous mode

On 8/15/24 10:58, Simon Horman wrote:
> On Mon, Aug 12, 2024 at 04:04:34PM -0400, Sean Anderson wrote:
>> If prmiscuous mode is disabled when there are fewer than four multicast
>> addresses, then it will to be reflected in the hardware. Fix this by
>> always clearing the promiscuous mode flag even when we program multicast
>> addresses.
>> 
>> Fixes: 8a3b7a252dca ("drivers/net/ethernet/xilinx: added Xilinx AXI Ethernet driver")
>> Signed-off-by: Sean Anderson <sean.anderson@...ux.dev>
>> ---
>> 
>>  drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 4 ++++
>>  1 file changed, 4 insertions(+)
>> 
>> diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
>> index ca04c298daa2..e664611c29cf 100644
>> --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
>> +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
>> @@ -451,6 +451,10 @@ static void axienet_set_multicast_list(struct net_device *ndev)
>>  	} else if (!netdev_mc_empty(ndev)) {
>>  		struct netdev_hw_addr *ha;
>>  
>> +		reg = axienet_ior(lp, XAE_FMI_OFFSET);
>> +		reg &= ~XAE_FMI_PM_MASK;
>> +		axienet_iow(lp, XAE_FMI_OFFSET, reg);
>> +
> 
> Hi Sean,
> 
> I notice that this replicates code in another part of this function.
> And that is then factored out into common code as part of the last
> patch of this series.
> 
> I guess that it is in the wash, but perhaps it would
> be nicer to factor out the common promisc mode setting code
> as part of this patch.
> 
> Otherwise, this LGTM.

I thought about doing that, but it would have required changing the
indentation of ~10 lines and I thought it would be easier to review
the patch without that noise.

--Sean