netdev - Re: [PATCH net-next 0/7] add support for VSC8584 and VSC8574 Microsemi quad-port PHYs

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Date:   Thu, 11 Oct 2018 08:18:46 +0200
From:   "Allan W. Nielsen" <allan.nielsen@...rochip.com>
To:     Linus Walleij <linus.walleij@...aro.org>
CC:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 0/7] add support for VSC8584 and VSC8574
 Microsemi quad-port PHYs

Hi Linus,

I'm Allan, working for Microchip, who acquired Microsemi, who acquired Vitesse.

Alexandre pointed me to your comments on the VSC7384 switch done by Vitesse ~15
years ago. BTW: the chip is not being sold any more, and is unlikely to turn up
in new products.

I managed to find the complete datasheet of this device, and convincing people
that it can be "opened-up" meaning that it is available without any NDA or
similar. It is a 1.2mb/200 page pdf, it is not avialable at any web page (that I
know of), but if you are interested in having it then I can send it in a mail to
you.

The 09/20/2018 14:38, Linus Walleij wrote:
> Just as a drive-by comment this seems vaguely related to the Vitesse
> DSA switch I merged in drivers/net/dsa/vitesse-vsc73xx.c
> The VSC* product name handily gives away the origin in Vitesse's
> product line.
> 
> The VSC73xx also have the 8051 CPU and internal RAM, but are
> accessed (typically) over SPI, and AFAICT this thing is talking over
> MDIO.
> 
> The Vitesse 73xx however also supports a WAN port and VLANs
> which makes it significantly different, falling into switch class I
> guess.
That is right, here are the list of feature from page 1 in the datasheet.

Features:
- 12 Gigabit Ethernet ports with nonblocking wire- speed performance
- IEEE802.1Q-in-Q nested VLAN support
- Tri-speed (10/100/1000 Mbps) RGMII interfaces
- Full duplex flow control (IEEE802.3x) and half duplex back pressure
- Support for both wire-speed automatic learning, and CPU-based learning
- Flexible link aggregation compliant with IEEE802.3ad
- 208 kB on-chip frame buffer
- Spanning Tree Protocol support (IEEE802.1D)
- Jumbo frame support
- Multiple Spanning Tree support (IEEE802.1s)
- Programmable classifier for QoS (Layer 4/Multimedia) into four classes of
  service
- Port-based Access Control (IEEE802.1X)
- IGMP, GARP, GMRP, and GVRP support
- 8192 MAC addresses and 4,096 VLAN support (IEEE802.1Q)
- Cost effective 4-pin serial CPU interface
- Per-port shaping, policing, and Broadcast and Multicast Storm Control
- Selection between on-chip 8051 CPU, or off-chip 8-bit or 16-bit CPU for SNMP
  and Web-based management

/Allan