Re: Marvell TopDog Driver Work

Re: Marvell TopDog Driver Work

[Luis R. Rodriguez]

On Fri, Aug 15, 2008 at 12:40:27PM -0700, Pat Erley wrote:
> Has anyone stepped up to help in the port of this to mac80211?  I just
> picked up a wrvs4400n router that uses it and have been working on
> getting 2.6.XX to work with it.

Not that I have heard of. Don't know.

  Luis

Re: Marvell TopDog Driver Work

[Dan Williams]

On Fri, 2008-08-15 at 12:58 -0700, Luis R. Rodriguez wrote:
> On Fri, Aug 15, 2008 at 12:40:27PM -0700, Pat Erley wrote:
> > Has anyone stepped up to help in the port of this to mac80211?  I just
> > picked up a wrvs4400n router that uses it and have been working on
> > getting 2.6.XX to work with it.
> 
> Not that I have heard of. Don't know.

There's code out there for the TopDog parts (Linville's marvell.git on
kernel.org), and I even have one or two of them lying around.  The
firmware interface isn't that different from the 8335 (mrv8k) and thus
the two product lines can probably share the same driver.

Lennert and Nick (from Marvell) are supposed to be working on a mac80211
driver for the 88w8687 part, which is probably just about the same
firmware interface as TopDog (aside from the N-specific bits, and
different TX & RX descriptors I'm sure).  I'd prefer to either start
fixing up mrv8k and then merge into whatever Lennert comes up with, or
see what they come up with and use that as a base for adding support for
older TopDog and 8310/8335 hardware.

mrv8k was always a bit rocky and never reliably got scan results on the
8335 cardbus hardware I had, even though the descriptor setup and the
mac80211 bits looked right.  There's some pre/post scan commands that we
need to hook into mac80211 which I posted patches for first, but
Johannes requested we not commit those until we really knew whether
pre/post scan were required.

Dan

Re: Marvell TopDog Driver Work

[Daniel Gimpelevich]

On Fri, 15 Aug 2008 16:08:37 -0400, Dan Williams wrote:

> On Fri, 2008-08-15 at 12:58 -0700, Luis R. Rodriguez wrote:
>> On Fri, Aug 15, 2008 at 12:40:27PM -0700, Pat Erley wrote:
>> > Has anyone stepped up to help in the port of this to mac80211?  I
>> > just picked up a wrvs4400n router that uses it and have been worki=
ng
>> > on getting 2.6.XX to work with it.
>>=20
>> Not that I have heard of. Don't know.
>=20
> There's code out there for the TopDog parts (Linville's marvell.git o=
n
> kernel.org), and I even have one or two of them lying around.  The
> firmware interface isn't that different from the 8335 (mrv8k) and thu=
s
> the two product lines can probably share the same driver.
>=20
> Lennert and Nick (from Marvell) are supposed to be working on a mac80=
211
> driver for the 88w8687 part, which is probably just about the same
> firmware interface as TopDog (aside from the N-specific bits, and
> different TX & RX descriptors I'm sure).  I'd prefer to either start
> fixing up mrv8k and then merge into whatever Lennert comes up with, o=
r
> see what they come up with and use that as a base for adding support =
for
> older TopDog and 8310/8335 hardware.
>=20
> mrv8k was always a bit rocky and never reliably got scan results on t=
he
> 8335 cardbus hardware I had, even though the descriptor setup and the
> mac80211 bits looked right.  There's some pre/post scan commands that=
 we
> need to hook into mac80211 which I posted patches for first, but
> Johannes requested we not commit those until we really knew whether
> pre/post scan were required.
>=20
> Dan

Duh...
http://git.kernel.org/?p=3Dlinux/kernel/git/mcgrof/mrvl_cb82.git;a=3Dsu=
mmary

Also, I have a router with an 8361 chip and Linux Inside=E2=84=A2 for w=
hich I=20
have made a GPL Source Request. I was told that the sources will be=20
available two weeks from now. I don't expect the wi-fi driver to be in=20
source form in that release, but you never know in advance what they'll=
=20
stuff in there.

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Re: Marvell TopDog Driver Work

[Dan Williams]

On Mon, 2008-10-20 at 17:01 +0000, Daniel Gimpelevich wrote:
> On Fri, 15 Aug 2008 16:08:37 -0400, Dan Williams wrote:
>=20
> > On Fri, 2008-08-15 at 12:58 -0700, Luis R. Rodriguez wrote:
> >> On Fri, Aug 15, 2008 at 12:40:27PM -0700, Pat Erley wrote:
> >> > Has anyone stepped up to help in the port of this to mac80211?  =
I
> >> > just picked up a wrvs4400n router that uses it and have been wor=
king
> >> > on getting 2.6.XX to work with it.
> >>=20
> >> Not that I have heard of. Don't know.
> >=20
> > There's code out there for the TopDog parts (Linville's marvell.git=
 on
> > kernel.org), and I even have one or two of them lying around.  The
> > firmware interface isn't that different from the 8335 (mrv8k) and t=
hus
> > the two product lines can probably share the same driver.
> >=20
> > Lennert and Nick (from Marvell) are supposed to be working on a mac=
80211
> > driver for the 88w8687 part, which is probably just about the same
> > firmware interface as TopDog (aside from the N-specific bits, and
> > different TX & RX descriptors I'm sure).  I'd prefer to either star=
t
> > fixing up mrv8k and then merge into whatever Lennert comes up with,=
 or
> > see what they come up with and use that as a base for adding suppor=
t for
> > older TopDog and 8310/8335 hardware.
> >=20
> > mrv8k was always a bit rocky and never reliably got scan results on=
 the
> > 8335 cardbus hardware I had, even though the descriptor setup and t=
he
> > mac80211 bits looked right.  There's some pre/post scan commands th=
at we
> > need to hook into mac80211 which I posted patches for first, but
> > Johannes requested we not commit those until we really knew whether
> > pre/post scan were required.
> >=20
> > Dan
>=20
> Duh...
> http://git.kernel.org/?p=3Dlinux/kernel/git/mcgrof/mrvl_cb82.git;a=3D=
summary

Right, that's been there for a long time but it isn't up-to-date with
the latest mac80211 stuff, and I'm not sure Luis ever got it completely
ported over.  It should basically be used only for reference.

What I'd like to see is an integrated driver for both the 833x and the
836x softmac parts, since the firmware interfaces aren't actually that
much different.  We can start with one family and add support for the
other family later as long as we keep that fact in mind and code in a
manner that will easily support the other chips.

> Also, I have a router with an 8361 chip and Linux Inside=E2=84=A2 for=
 which I=20
> have made a GPL Source Request. I was told that the sources will be=20
> available two weeks from now. I don't expect the wi-fi driver to be i=
n=20
> source form in that release, but you never know in advance what they'=
ll=20
> stuff in there.

It'll still be based off net80211 unless Nick/Lennert have made any
progress.  Thus, it would still have to be ported to mac80211, and I'd
rather see a clean rewrite in the kernel coding style, which is what
mrv8k was supposed to be.

Dan


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Re: Marvell TopDog Driver Work

[Daniel Gimpelevich]

On Mon, 2008-10-20 at 13:36 -0400, Dan Williams wrote:
> On Mon, 2008-10-20 at 17:01 +0000, Daniel Gimpelevich wrote:
> > On Fri, 15 Aug 2008 16:08:37 -0400, Dan Williams wrote:
> >=20
> > > On Fri, 2008-08-15 at 12:58 -0700, Luis R. Rodriguez wrote:
> > >> On Fri, Aug 15, 2008 at 12:40:27PM -0700, Pat Erley wrote:
> > >> > Has anyone stepped up to help in the port of this to mac80211?=
  I
> > >> > just picked up a wrvs4400n router that uses it and have been w=
orking
> > >> > on getting 2.6.XX to work with it.
> > >>=20
> > >> Not that I have heard of. Don't know.
> > >=20
> > > There's code out there for the TopDog parts (Linville's marvell.g=
it on
> > > kernel.org), and I even have one or two of them lying around.  Th=
e
> > > firmware interface isn't that different from the 8335 (mrv8k) and=
 thus
> > > the two product lines can probably share the same driver.
> > >=20
> > > Lennert and Nick (from Marvell) are supposed to be working on a m=
ac80211
> > > driver for the 88w8687 part, which is probably just about the sam=
e
> > > firmware interface as TopDog (aside from the N-specific bits, and
> > > different TX & RX descriptors I'm sure).  I'd prefer to either st=
art
> > > fixing up mrv8k and then merge into whatever Lennert comes up wit=
h, or
> > > see what they come up with and use that as a base for adding supp=
ort for
> > > older TopDog and 8310/8335 hardware.
> > >=20
> > > mrv8k was always a bit rocky and never reliably got scan results =
on the
> > > 8335 cardbus hardware I had, even though the descriptor setup and=
 the
> > > mac80211 bits looked right.  There's some pre/post scan commands =
that we
> > > need to hook into mac80211 which I posted patches for first, but
> > > Johannes requested we not commit those until we really knew wheth=
er
> > > pre/post scan were required.
> > >=20
> > > Dan
> >=20
> > Duh...
> > http://git.kernel.org/?p=3Dlinux/kernel/git/mcgrof/mrvl_cb82.git;a=3D=
summary
>=20
> Right, that's been there for a long time but it isn't up-to-date with
> the latest mac80211 stuff, and I'm not sure Luis ever got it complete=
ly
> ported over.  It should basically be used only for reference.
>=20
> What I'd like to see is an integrated driver for both the 833x and th=
e
> 836x softmac parts, since the firmware interfaces aren't actually tha=
t
> much different.  We can start with one family and add support for the
> other family later as long as we keep that fact in mind and code in a
> manner that will easily support the other chips.
>=20
> > Also, I have a router with an 8361 chip and Linux Inside=E2=84=A2 f=
or which I=20
> > have made a GPL Source Request. I was told that the sources will be=
=20
> > available two weeks from now. I don't expect the wi-fi driver to be=
 in=20
> > source form in that release, but you never know in advance what the=
y'll=20
> > stuff in there.
>=20
> It'll still be based off net80211 unless Nick/Lennert have made any
> progress.  Thus, it would still have to be ported to mac80211, and I'=
d
> rather see a clean rewrite in the kernel coding style, which is what
> mrv8k was supposed to be.
>=20
> Dan

The "Duh..." was a response to the "Not that I have heard of. Don't
know." statement, which was pretty ironic. The rest was intended to be
context. Any net80211-based code for TopDog would still be a useful
reference for the 11n-specific bits that would need to be added to mrv8=
k
after it works correctly with CardBus 11g cards. What is the canonical
URL for the experimental source repository for those, BTW?

More thanks go out to Lennert for his work on the Marvell CPU cores,
too.

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Re: Marvell TopDog Driver Work

[Luis R. Rodriguez]

On Mon, Oct 20, 2008 at 11:03 AM, Daniel Gimpelevich
<daniel@gimpelevich.san-francisco.ca.us> wrote:

> The "Duh..." was a response to the "Not that I have heard of. Don't
> know." statement, which was pretty ironic.

Well your question was "Has anyone stepped up to help in the port of
this to mac80211" and I thought you already knew I had that tree.

> The rest was intended to be
> context. Any net80211-based code for TopDog would still be a useful
> reference for the 11n-specific bits that would need to be added to mrv8k
> after it works correctly with CardBus 11g cards. What is the canonical
> URL for the experimental source repository for those, BTW?

As documented in my git tree, I took the code from John's tree, which
I think is the canonical reference. John's tree includes the entire
Linux kernel tree though, that's why I tried to start out separately
with a driver that will just compile using the kernel headers.

> More thanks go out to Lennert for his work on the Marvell CPU cores,
> too.

ACK -- will mrv8k not support top dog?

  Luis

Re: Marvell TopDog Driver Work

[Daniel Gimpelevich]

On Mon, 2008-10-20 at 12:45 -0700, Luis R. Rodriguez wrote:
> On Mon, Oct 20, 2008 at 11:03 AM, Daniel Gimpelevich
> <daniel@gimpelevich.san-francisco.ca.us> wrote:
> 
> > The "Duh..." was a response to the "Not that I have heard of. Don't
> > know." statement, which was pretty ironic.
> 
> Well your question was "Has anyone stepped up to help in the port of
> this to mac80211" and I thought you already knew I had that tree.

I did not ask that, because I saw the tree, and that the initial import
was from the marvell.git tree. The OP might not have realized that the
code was TopDog-related even if he did see it. Since there is no working
mac80211 code for TopDog, any existing hardware-specific code for it may
prove to be a useful reference during the porting process. Anybody
investigating the possibility of stepping up to help in the port needs
to know what is already available and what is not.

I don't think there is any question of *whether* TopDog support is
possible in mrv8k, only when, and "right now" does not yet appear to be
the answer. I really hope to be proven wrong on that, though.

Re: Marvell TopDog Driver Work

[Dan Williams]

On Mon, 2008-10-20 at 13:05 -0700, Daniel Gimpelevich wrote:
> On Mon, 2008-10-20 at 12:45 -0700, Luis R. Rodriguez wrote:
> > On Mon, Oct 20, 2008 at 11:03 AM, Daniel Gimpelevich
> > <daniel@gimpelevich.san-francisco.ca.us> wrote:
> > 
> > > The "Duh..." was a response to the "Not that I have heard of. Don't
> > > know." statement, which was pretty ironic.
> > 
> > Well your question was "Has anyone stepped up to help in the port of
> > this to mac80211" and I thought you already knew I had that tree.
> 
> I did not ask that, because I saw the tree, and that the initial import
> was from the marvell.git tree. The OP might not have realized that the
> code was TopDog-related even if he did see it. Since there is no working
> mac80211 code for TopDog, any existing hardware-specific code for it may
> prove to be a useful reference during the porting process. Anybody
> investigating the possibility of stepping up to help in the port needs
> to know what is already available and what is not.

Definitely, I've looked at marvell.git (topdog) and Luis's code, and
earlier Marvell GPL code quite extensively.  The firmware interface is
quite similar between the TopDog (802.11n) parts and the b/g parts, as
are the TX and RX descriptors.  From my research, I didn't think it
would be that hard to support both parts in the same driver.

My strategy would be this, assuming you have TopDog hardware.  If you do
not, I can ship you a CardBus TopDog card:

1) Use marvell.git and Luis' attempt to get minimal b/g support working
for the TopDog parts

2) Start adding in the support for 8335/8310 parts using mrv8k (and
possibly BSD's malo(4)) as a guide

3) Add the 802.11n bits of TopDog stuff

The _most_ important thing is first to get a stable b/g driver, then add
the candy later.  Since we have a full TopDog driver implementation,
that might be the best thing to get working first.  mrv8k was never able
to get very far for me when I was poking at it, I couldn't even get
reliable scan results.

> I don't think there is any question of *whether* TopDog support is
> possible in mrv8k, only when, and "right now" does not yet appear to be
> the answer. I really hope to be proven wrong on that, though.

Oh, it's certainly possible in mrv8k.  But obviously you just want to
get something up and running first, then add the tasty bits like N
support later.

Dan

Re: Marvell TopDog Driver Work

[Daniel Gimpelevich]

On Tue, 2008-10-21 at 09:18 -0400, Dan Williams wrote:
> Definitely, I've looked at marvell.git (topdog) and Luis's code, and
> earlier Marvell GPL code quite extensively.  The firmware interface is
> quite similar between the TopDog (802.11n) parts and the b/g parts, as
> are the TX and RX descriptors.  From my research, I didn't think it
> would be that hard to support both parts in the same driver.
> 
> My strategy would be this, assuming you have TopDog hardware.  If you do
> not, I can ship you a CardBus TopDog card:

The only TopDog hardware I have is the aforementioned Orion-based
router, which has OpenWRT in its future. That certainly fits the
strategy, but with somewhat unfortunate timing. I previously had access
to an 8335 card, but don't currently.

> 1) Use marvell.git and Luis' attempt to get minimal b/g support working
> for the TopDog parts
> 
> 2) Start adding in the support for 8335/8310 parts using mrv8k (and
> possibly BSD's malo(4)) as a guide
> 
> 3) Add the 802.11n bits of TopDog stuff

That contrasts slightly with the understanding I had:
1) Use the in-tree libertas library to get b/g going for 8335/8310
parts, using mrv8k/malo as a guide.
2) Start adding in the support for TopDog parts in b/g mode, from
mrvl_cb82.git
3) Add the 802.11n bits of TopDog stuff

> The _most_ important thing is first to get a stable b/g driver, then add
> the candy later.

I could not agree more.

> Since we have a full TopDog driver implementation,

Do we?

> that might be the best thing to get working first.  mrv8k was never able
> to get very far for me when I was poking at it, I couldn't even get
> reliable scan results.

Re: Marvell TopDog Driver Work

[Daniel Gimpelevich]

On Tue, 2008-10-21 at 16:16 -0700, Daniel Gimpelevich wrote:
> 1) Use the in-tree libertas library to get b/g going for 8335/8310
> parts, using mrv8k/malo as a guide.

Never mind; I just noticed that the code is FullMAC. Ick.

Re: Marvell TopDog Driver Work

[Dan Williams]

On Tue, 2008-10-21 at 16:26 -0700, Daniel Gimpelevich wrote:
> On Tue, 2008-10-21 at 16:16 -0700, Daniel Gimpelevich wrote:
> > 1) Use the in-tree libertas library to get b/g going for 8335/8310
> > parts, using mrv8k/malo as a guide.
> 
> Never mind; I just noticed that the code is FullMAC. Ick.

It's not all that icky, actually :)  But yes, the current libertas
driver is for the fullmac parts, while 8310, 8335, 8361, and 8362 are
softmac parts.

Dan

Re: Marvell TopDog Driver Work

[John Daiker]

snip
> Definitely, I've looked at marvell.git (topdog) and Luis's code, and
> earlier Marvell GPL code quite extensively.  The firmware interface is
> quite similar between the TopDog (802.11n) parts and the b/g parts, as
> are the TX and RX descriptors.  From my research, I didn't think it
> would be that hard to support both parts in the same driver.
>
> My strategy would be this, assuming you have TopDog hardware.  If you do
> not, I can ship you a CardBus TopDog card:
>
> 1) Use marvell.git and Luis' attempt to get minimal b/g support working
> for the TopDog parts
Don't think I can help with this part, as I don't have TopDog hardware...
>
> 2) Start adding in the support for 8335/8310 parts using mrv8k (and
> possibly BSD's malo(4)) as a guide
But I do have 8335 hardware:

00:0c.0 Ethernet controller: Marvell Technology Group Ltd. 88w8335 
[Libertas] 802.11b/g Wireless (rev 03)

--snip from the old mrv8k driver from a few months ago--
(mrv8k): successfully uploaded firmware
(mrv8k): HW ver. 1, FW ver. 0x3000036, 2 antennas, regulatory domain US 
(FCC)
--snip--

If memory serves, it's a Netgear 311v3 PCI... but the packaging isn't 
around and I'm too lazy to turn my machine off to physically look at the 
card (and stand on my head!).
>
> 3) Add the 802.11n bits of TopDog stuff
>
> The _most_ important thing is first to get a stable b/g driver, then add
> the candy later.  Since we have a full TopDog driver implementation,
> that might be the best thing to get working first.  mrv8k was never able
> to get very far for me when I was poking at it, I couldn't even get
> reliable scan results.
>
>> I don't think there is any question of *whether* TopDog support is
>> possible in mrv8k, only when, and "right now" does not yet appear to be
>> the answer. I really hope to be proven wrong on that, though.
>
> Oh, it's certainly possible in mrv8k.  But obviously you just want to
> get something up and running first, then add the tasty bits like N
> support later.
>
> Dan
I am more than willing to help test and/or debug any driver developments 
that come down the pipeline for the 8335 chip.

JD

Re: Marvell TopDog Driver Work

[Luis R. Rodriguez]

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