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Date: Wed, 18 Mar 2026 12:10:37 -0700
From: Saeed Mahameed <saeed@kernel.org>
To: Jakub Kicinski <kuba@kernel.org>
Cc: Tariq Toukan <tariqt@nvidia.com>, Eric Dumazet <edumazet@google.com>,
	Paolo Abeni <pabeni@redhat.com>,
	Andrew Lunn <andrew+netdev@lunn.ch>,
	"David S. Miller" <davem@davemloft.net>,
	Saeed Mahameed <saeedm@nvidia.com>, Mark Bloch <mbloch@nvidia.com>,
	Leon Romanovsky <leon@kernel.org>, netdev@vger.kernel.org,
	linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org,
	Gal Pressman <gal@nvidia.com>, Moshe Shemesh <moshe@nvidia.com>,
	Dragos Tatulea <dtatulea@nvidia.com>
Subject: Re: [PATCH net-next] net/mlx5e: Enable mac forwarding on uplink
 representor
Message-ID: <abr4O7rfDoOIKHYW@sx113>
References: <20260310104841.1862380-1-tariqt@nvidia.com>
 <20260311203319.76d35ce0@kernel.org>
 <abmZf3bRl2uQ69EA@sx113>
 <20260317143653.0eaa50a1@kernel.org>
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In-Reply-To: <20260317143653.0eaa50a1@kernel.org>

On 17 Mar 14:36, Jakub Kicinski wrote:
>On Tue, 17 Mar 2026 11:12:15 -0700 Saeed Mahameed wrote:
>> On 11 Mar 20:33, Jakub Kicinski wrote:
>> >On Tue, 10 Mar 2026 12:48:41 +0200 Tariq Toukan wrote:
>> >> This small patch enables mac forwarding to MPFs via uplink representor,
>> >
>> >"mac forwarding to MPF via uplink representor"
>> >Can't wrap my head around this "via". Could you explain this better?
>> >Perhaps some tool can spit out a little diagram to make the flow clear?
>> >
>>
>> Mac forwarding in the sense of linux bridge mac forwarding mechanism which
>> requires set_rx_mode ndo to be implemented.
>>
>> Linux-bridge --> mlx5-uplink-rep --> set_rx_mode --> set up mac in HW.
>
>And the actual forwarding happens in SW bridge? This is just to
>configure the Rx filter not to discard on Rx?

Yes Forwarding happens on the SW bridge, just to register the mac so it
won't get dropped.