Messages in this thread | ![/](/images/icornerl.gif) | | Date | Wed, 24 May 2023 14:53:57 +0200 | From | Lukasz Majewski <> | Subject | Re: [PATCH v7 1/3] dsa: marvell: Define .set_max_frame_size() function for mv88e6250 SoC family |
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Hi Russell,
> On Tue, May 23, 2023 at 04:29:10PM +0200, Lukasz Majewski wrote: > > Switches from mv88e6250 family (the marketing name - "Link Street", > > including mv88e6020 and mv88e6071) need the possibility to setup the > > maximal frame size, as they support frames up to 2048 bytes. > > > > Signed-off-by: Lukasz Majewski <lukma@denx.de> > > Adding this function doesn't allow the "possibility" for a larger > frame size. Adding it changes the value returned from > mv88e6xxx_get_max_mtu() to be a larger frame size, so all switches > that make use of mv88e6250_ops will be expected to support this > larger frame size. Do we know whether that is true? >
According to functional specification - the 6070, 6071, 6250, 6020 and 6220 have "Max Frame Size" of 2048 bytes.
The mv88e6xxx_get_max_mtu() now will: return 1632 - VLAN_ETH_HLEN - EDSA_HLEN - ETH_FCS_LEN;
which is acceptable and safe for this family of chips.
> There were patches floating about a while ago that specified the > maximum size in struct mv88e6xxx_info, but it seems those died a > death. >
Those patches seems to not be strictly required after Vladimir's work.
The v7 provides what I need, so yes - extra patches from v6 can be discarded.
Best regards,
Lukasz Majewski
--
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