From: Gerd Hoffmann <kraxel@redhat.com>
To: BALATON Zoltan <balaton@eik.bme.hu>
Cc: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>,
qemu-devel@nongnu.org, Howard Spoelstra <hsp.cat7@gmail.com>
Subject: Re: OHCI/usb pass through
Date: Fri, 1 Oct 2021 14:22:00 +0200 [thread overview]
Message-ID: <20211001122200.wjmzcheu4aunlhq7@sirius.home.kraxel.org> (raw)
In-Reply-To: <81cbbb94-c4dd-dde2-d98a-7487269169cf@eik.bme.hu>
Hi,
> > > We can get the endpoint from a packet and from ohci so
> > > I wonder if we can get the active packet from ep->queue (and how to do that)
> >
> > I think ohci never looks beyond the active td so there should never be
> > more than one packet on the list.
>
> OK, how to get the packet from that QTAILQ list? If there are multiple
> packets is the active one first or last? How to get that? I could try to
> find the answers in the code but I realy did not want to spend much time
> with it just trying to help Howard so I'd like to ask for some help with
> this.
See include/qemu/queue.h, QTAILQ_FIRST() is what you need. Returns NULL
when the queue is empty. There is also a separate QLIST_EMPTY() helper.
grepping in hw/usb/*.c should find you code examples in other host
adapters code.
take care,
Gerd
prev parent reply other threads:[~2021-10-01 12:25 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-01 1:31 OHCI/usb pass through BALATON Zoltan
2021-10-01 4:39 ` Gerd Hoffmann
2021-10-01 11:35 ` BALATON Zoltan
2021-10-01 12:22 ` Gerd Hoffmann [this message]
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