priority queues on dp83820

priority queues on dp83820

[Christian Widmer]

has anybody try to use the priority queues of the dp83820?
or does somebody know where to get docu knewer then the 
preliminary form february 2001?

i wrote a driver for the dp83820. now i tried to use 
priority queuing for prescheduled zero copy datastreans.
first i just whanted enable priority queueing without 
inserting of any vlan tag. this works for 1 to 3 queues 
like it sais in the docu (untagged packets are queued 
like packets with priority 0). but when i enable the 4th
queue i receive all none tagged data on queue 1 instead 
of queue 0. and if i enalbe vlan-tagging globaly or on 
a per packet basis i don't get any interrupts on the 
receiving side. has anybody an idea whats going on. if 
you need the code to have a lock at - let me know, i 
realy need some help.

chris

Re: priority queues on dp83820

[Benjamin LaHaise]

On Fri, Oct 26, 2001 at 04:01:48PM +0200, Christian Widmer wrote:
> has anybody try to use the priority queues of the dp83820?
> or does somebody know where to get docu knewer then the 
> preliminary form february 2001?

I've not tried implementing priority queuing ins ns83820.c, but 
the docs from Febuary 2001 are reasonably complete.

> i wrote a driver for the dp83820. now i tried to use 
> priority queuing for prescheduled zero copy datastreans.
> first i just whanted enable priority queueing without 
> inserting of any vlan tag. this works for 1 to 3 queues 
> like it sais in the docu (untagged packets are queued 
> like packets with priority 0). but when i enable the 4th
> queue i receive all none tagged data on queue 1 instead 
> of queue 0. and if i enalbe vlan-tagging globaly or on 
> a per packet basis i don't get any interrupts on the 
> receiving side. has anybody an idea whats going on. if 
> you need the code to have a lock at - let me know, i 
> realy need some help.

The receiver won't accept packets if they do not match the filter 
and filtering is enabled.  If you have any of the reject bits set 
in the RXCFG register, that could well be tripping your code up.

		-ben

Re: priority queues on dp83820

[Christian Widmer]

ok for everybody how's also's working with the dp83820 i've 
somp partial results. 

i disabled priority queuing for the moment and started
debuging the vlan-tag stuff.

at the moment it seams that:
it looks like that the 83820 inserts the vlan tag corretly
and callculates CRC. on the receiving side it detects the
vlan-tag. but don't run with the idea that you may ask for 
automaticaly strip of the vlantag again. if you try the 
83820 gets confused with its own calculated CRC. when 
calculating CRC it must include the vlan tag on one side 
exclude it on the other side.

how this works with priority queueing ?

//chris

On Friday 26 October 2001 16:01, Christian Widmer wrote:
> has anybody try to use the priority queues of the dp83820?
> or does somebody know where to get docu knewer then the
> preliminary form february 2001?
>
> i wrote a driver for the dp83820. now i tried to use
> priority queuing for prescheduled zero copy datastreans.
> first i just whanted enable priority queueing without
> inserting of any vlan tag. this works for 1 to 3 queues
> like it sais in the docu (untagged packets are queued
> like packets with priority 0). but when i enable the 4th
> queue i receive all none tagged data on queue 1 instead
> of queue 0. and if i enalbe vlan-tagging globaly or on
> a per packet basis i don't get any interrupts on the
> receiving side. has anybody an idea whats going on. if
> you need the code to have a lock at - let me know, i
> realy need some help.
>
> chris
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/

Re: priority queues on dp83820

[Christian Widmer]

ok it's me again. i got how priority queuing works. and
this is quite strange for the moment. when using 2 or 3
queues everything works like said in the docu. with 4
queues it gets wired. blow there's a list where the 
different user priorities in the VTID go:

2 queues:
---------
queue 0:	priorities: 0, 1, 2, 3, untagged framges
queue 1:	priorities: 4, 5, 6, 7

3 queues:
---------
queue 0:	priorities: 0, 1, 2, 3, untagged framges
queue 1:	priorities: 4, 5
queue 2:	priorities: 6, 7

4 queues:
---------
queue 0:	priorities: 1, 2
queue 1:	priorities: 0, 3, untagged framges
queue 2:	priorities: 4, 5
queue 3:	priorities: 6, 7


the step from 3 to 4 queues is quite amuseing. 

chris


On Friday 26 October 2001 22:27, Christian Widmer wrote:
> ok for everybody how's also's working with the dp83820 i've
> somp partial results.
>
> i disabled priority queuing for the moment and started
> debuging the vlan-tag stuff.
>
> at the moment it seams that:
> it looks like that the 83820 inserts the vlan tag corretly
> and callculates CRC. on the receiving side it detects the
> vlan-tag. but don't run with the idea that you may ask for
> automaticaly strip of the vlantag again. if you try the
> 83820 gets confused with its own calculated CRC. when
> calculating CRC it must include the vlan tag on one side
> exclude it on the other side.
>
> how this works with priority queueing ?
>
> //chris
>
> On Friday 26 October 2001 16:01, Christian Widmer wrote:
> > has anybody try to use the priority queues of the dp83820?
> > or does somebody know where to get docu knewer then the
> > preliminary form february 2001?
> >
> > i wrote a driver for the dp83820. now i tried to use
> > priority queuing for prescheduled zero copy datastreans.
> > first i just whanted enable priority queueing without
> > inserting of any vlan tag. this works for 1 to 3 queues
> > like it sais in the docu (untagged packets are queued
> > like packets with priority 0). but when i enable the 4th
> > queue i receive all none tagged data on queue 1 instead
> > of queue 0. and if i enalbe vlan-tagging globaly or on
> > a per packet basis i don't get any interrupts on the
> > receiving side. has anybody an idea whats going on. if
> > you need the code to have a lock at - let me know, i
> > realy need some help.
> >
> > chris
> >
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel"
> > in the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at  http://www.tux.org/lkml/
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/

Re: priority queues on dp83820

[Christian Widmer]

sorry i was wrong with the CRC. the problem seems to be 
that when inserting a vlan-tag the number of possible
padding data is 4 octes smaller. when stripping the 
vlantag off the dp83820 does not remember that it took
4 addtional bytes awai and marks the packet as a runt
packat.

chris

On Friday 26 October 2001 22:27, Christian Widmer wrote:
> ok for everybody how's also's working with the dp83820 i've
> somp partial results.
>
> i disabled priority queuing for the moment and started
> debuging the vlan-tag stuff.
>
> at the moment it seams that:
> it looks like that the 83820 inserts the vlan tag corretly
> and callculates CRC. on the receiving side it detects the
> vlan-tag. but don't run with the idea that you may ask for
> automaticaly strip of the vlantag again. if you try the
> 83820 gets confused with its own calculated CRC. when
> calculating CRC it must include the vlan tag on one side
> exclude it on the other side.
>
> how this works with priority queueing ?
>
> //chris
>
> On Friday 26 October 2001 16:01, Christian Widmer wrote:
> > has anybody try to use the priority queues of the dp83820?
> > or does somebody know where to get docu knewer then the
> > preliminary form february 2001?
> >
> > i wrote a driver for the dp83820. now i tried to use
> > priority queuing for prescheduled zero copy datastreans.
> > first i just whanted enable priority queueing without
> > inserting of any vlan tag. this works for 1 to 3 queues
> > like it sais in the docu (untagged packets are queued
> > like packets with priority 0). but when i enable the 4th
> > queue i receive all none tagged data on queue 1 instead
> > of queue 0. and if i enalbe vlan-tagging globaly or on
> > a per packet basis i don't get any interrupts on the
> > receiving side. has anybody an idea whats going on. if
> > you need the code to have a lock at - let me know, i
> > realy need some help.
> >
> > chris
> >
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel"
> > in the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at  http://www.tux.org/lkml/
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/

priority queues on dp83820

[Christian Widmer]

has anybody try to use the priority queues of the dp83820?
or does somebody know where to get docu knewer then the 
preliminary form february 2001?

i wrote a driver for the dp83820. now i tried to use 
priority queuing for prescheduled zero copy datastreans.
first i just whanted enable priority queueing without 
inserting of any vlan tag. this works for 1 to 3 queues 
like it sais in the docu (untagged packets are queued 
like packets with priority 0). but when i enable the 4th
queue i receive all none tagged data on queue 1 instead 
of queue 0. and if i enalbe vlan-tagging globaly or on 
a per packet basis i don't get any interrupts on the 
receiving side. has anybody an idea whats going on. if 
you need the code to have a lock at - let me know, i 
realy need some help.

chris