From: Jakub Kicinski <kuba@kernel.org>
To: Cedric Jehasse via B4 Relay
<devnull+cedric.jehasse.luminex.be@kernel.org>
Cc: cedric.jehasse@luminex.be, "Andrew Lunn" <andrew@lunn.ch>,
"Vladimir Oltean" <olteanv@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
"Eric Dumazet" <edumazet@google.com>,
"Paolo Abeni" <pabeni@redhat.com>,
"Simon Horman" <horms@kernel.org>,
"Russell King" <linux@armlinux.org.uk>,
"Jamal Hadi Salim" <jhs@mojatatu.com>,
"Jiri Pirko" <jiri@resnulli.us>,
"Vinicius Costa Gomes" <vinicius.gomes@intel.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
"Luke Howard" <lukeh@padl.com>, "Marek Behún" <kabel@kernel.org>,
"Cedric Jehasse" <cedric.jehasse@gmail.com>
Subject: Re: [PATCH net-next v8 2/3] net: dsa: mv88e6xxx: use the hw tx queues
Date: Mon, 17 Aug 2026 10:50:24 -0700 [thread overview]
Message-ID: <20260817105024.65be6d55@kernel.org> (raw)
In-Reply-To: <20260811-net-next-mv88e6xxx-cbs-v8-2-10d0baab2905@luminex.be>
On Tue, 11 Aug 2026 13:45:48 +0200 Cedric Jehasse via B4 Relay wrote:
> When transmitting fill in the PRI field in the dsa tag to select the
> egress queue is sent to.
> From the datasheets i've looked at these switches have 4 or 8 transmit
> queues per port.
> Note: skbs with skb->offload_fwd_mark set use the DSA_CMD_FORWARD
> tag. These are processed as normal ingress frames, meaning the queue
> they end up in can still be altered by other switch config. eg. priority
> overrides, tcam policies.
> This isn't done for vlan tagged frames because this would overwrite the
> PCP value in the vlan tag (The PRI field in the dsa
> tag is used as the PCP value in the vlan tag).
Pretending that a DSA device has multiple Tx queues _from the stack_
makes no sense. You should be offloading PRIO as the root qdisc,
like mlxsw does. Then the rate limiters should be attached as children
of PRIO.
next prev parent reply other threads:[~2026-08-17 17:50 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-11 11:45 [PATCH net-next v8 0/3] net: dsa: mv88e6xxx: add support for credit based shaper Cedric Jehasse via B4 Relay
2026-08-11 11:45 ` Cedric Jehasse
2026-08-11 11:45 ` [PATCH net-next v8 1/3] net/sched: cbs: add extack to struct tc_cbs_qopt_offload Cedric Jehasse via B4 Relay
2026-08-11 11:45 ` Cedric Jehasse
2026-08-11 11:45 ` [PATCH net-next v8 2/3] net: dsa: mv88e6xxx: use the hw tx queues Cedric Jehasse via B4 Relay
2026-08-11 11:45 ` Cedric Jehasse
2026-08-17 17:50 ` Jakub Kicinski [this message]
2026-08-11 11:45 ` [PATCH net-next v8 3/3] net: dsa: mv88e6xxx: add support for credit based shaper Cedric Jehasse via B4 Relay
2026-08-11 11:45 ` Cedric Jehasse
2026-08-17 17:45 ` Jakub Kicinski
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