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Thread-Topic: Number of USB devices limited? 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ASN(0.00)[asn:109, ipnet:173.37.128.0/19, country:US]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[cisco.com:s=iport,cisco.onmicrosoft.com:s=selector2-cisco-onmicrosoft-com]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; DWL_DNSWL_LOW(-1.00)[cisco.com:dkim]; TO_MATCH_ENVRCPT_SOME(0.00)[]; MLMMJ_DEST(0.00)[freebsd-questions]; WHITELIST_SPF_DKIM(-3.00)[cisco.com:d:+,cisco.com:s:+]; RCVD_COUNT_SEVEN(0.00)[7] X-ThisMailContainsUnwantedMimeParts: N --_000_BL1PR11MB55096D7496B9E6449ACD6B89C5F59BL1PR11MB5509namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable > Not specific to FreeBSD, but to the USB standard itself (I think). There = is a limit to the number of endpoints, as you describe, but there is also a= limit to the number of > hubs you can cascade. The number is low; I think = it's 7. If you have more than $NUMBER of hubs in a row, you will get errati= c behavior from your USB endpoints. And > many things count as a "hub" - your computer probably takes up two, for e= xample. Thanks. I'll take a look when I get online and see if I can figure out what= the hub[s] is[are] adding to the overhead. -Brian ________________________________ From: Chris Hill Sent: Tuesday, April 19, 2022 11:09 PM To: Brian McGovern (bmcgover) Cc: freebsd-questions@freebsd.org Subject: Re: Number of USB devices limited? Not specific to FreeBSD, but to the USB standard itself (I think). There is a limit to the number of endpoints, as you describe, but there is also a limit to the number of hubs you can cascade. The number is low; I think it's 7. If you have more than $NUMBER of hubs in a row, you will get erratic behavior from your USB endpoints. And many things count as a "hub" - your computer probably takes up two, for example. On Tue, 19 Apr 2022, Brian McGovern (bmcgover) wrote: > Looking at the FreeBSD handbook, Chapter 13, it looks like the > expectation is that I should be able to attach "the maximum of 126 > devices". Unfortunately, it seems I'm getting in the low 20s (21 FTDI > serial cables, USB keyboard, and mouse), after which I start getting > the following in the logs: > > "Error initializing deviceusb_alloc_device: device init 34 failed > (USB_ERR_IOERROR, ignored)" > > and > > "uhub_reattach_port: could not allocate new device". > > > If I look at /dev/ugen*, there are the ugen devices for 0.1->0.33; so > its feeling like there may be limit in the serial port driver for the > number of /dev/cua* devices, which presently only number > cuaU0->cuaU20. So, I'm assuming this may not be a "USB" issue as much > as the number of USB serial ports (ucom?) that can be connected. > > Before I go on a code crawl to figure out how this is failing and if > it can be scaled up, I'm curious if anyone is aware of a coded limit > for the number of USB serial devices (or USB devices in general) that > can be connected before running in to this? I'm looking to push > upwards to _maybe_ 40 FTDI devices. > > -Brian > -- Chris Hill chris@monochrome.org --_000_BL1PR11MB55096D7496B9E6449ACD6B89C5F59BL1PR11MB5509namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
> Not specific to FreeBS= D, but to the USB standard itself (I think). There is a limit to the number= of endpoints, as you describe, but there is also a limit to the number of = > hubs you can cascade. The number is low; I think it's 7. If you have more than $NUMBER of hubs in a row, you will g= et erratic behavior from your USB endpoints. And
> many things count as a= "hub" - your computer probably takes up two, for example.=

Thanks. I'll take a look when I get online and see if I ca= n figure out what the hub[s] is[are]  adding to the overhead.

         &nbs= p;    -Brian
From: Chris Hill <chris@= monochrome.org>
Sent: Tuesday, April 19, 2022 11:09 PM
To: Brian McGovern (bmcgover) <bmcgover@cisco.com>
Cc: freebsd-questions@freebsd.org <freebsd-questions@freebsd.org&= gt;
Subject: Re: Number of USB devices limited?
 
Not specific to FreeBSD, but to the USB standard i= tself (I think). There
is a limit to the number of endpoints, as you describe, but there is
also a limit to the number of hubs you can cascade. The number is low; I think it's 7. If you have more than $NUMBER of hubs in a row, you will
get erratic behavior from your USB endpoints. And many things count as a "hub" - your computer probably takes up two, for example.


On Tue, 19 Apr 2022, Brian McGovern (bmcgover) wrote:

> Looking at the FreeBSD handbook, Chapter 13, it looks like the
> expectation is that I should be able to attach "the maximum of 12= 6
> devices". Unfortunately, it seems I'm getting in the low 20s (21 = FTDI
> serial cables, USB keyboard, and mouse), after which I start getting <= br> > the following in the logs:
>
> "Error initializing deviceusb_alloc_device: device init 34 failed=
> (USB_ERR_IOERROR, ignored)"
>
> and
>
> "uhub_reattach_port: could not allocate new device".
>
>
> If I look at /dev/ugen*, there are the ugen devices for 0.1->0.33; = so
> its feeling like there may be limit in the serial port driver for the =
> number of /dev/cua* devices, which presently only number
> cuaU0->cuaU20. So, I'm assuming this may not be a "USB" i= ssue as much
> as the number of USB serial ports (ucom?) that can be connected.
>
> Before I go on a code crawl to figure out how this is failing and if <= br> > it can be scaled up, I'm curious if anyone is aware of a coded limit <= br> > for the number of USB serial devices (or USB devices in general) that =
> can be connected before running in to this? I'm looking to push
> upwards to _maybe_ 40 FTDI devices.
>
>          -Brian
>

--
Chris Hill           = ;    chris@monochrome.org
--_000_BL1PR11MB55096D7496B9E6449ACD6B89C5F59BL1PR11MB5509namp_--