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Message-ID: <4C827002.6060808@simon.arlott.org.uk> Date: Sat, 04 Sep 2010 17:12:50 +0100 From: Simon Arlott <simon@...e.lp0.eu> To: Ondrej Zary <linux@...nbow-software.org> CC: David Brownell <dbrownell@...rs.sourceforge.net>, netdev@...r.kernel.org, Kernel development list <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] [RFC] introduce cx82310_eth: Conexant CX82310-based ADSL router USB ethernet driver On 04/09/10 12:57, Ondrej Zary wrote: > On Saturday 04 September 2010 00:14:54 Simon Arlott wrote: >> On 03/09/10 22:17, Ondrej Zary wrote: >> > + /* send command packet */ >> > + ret = usb_bulk_msg(udev, usb_sndbulkpipe(udev, CMD_EP), buf, >> > + CMD_PACKET_SIZE, &actual_len, CMD_TIMEOUT); >> >> From your previous lsusb output this is an interrupt endpoint, although >> usb_bulk_msg will auto-detect the type. > > There's also usb_interrupt_msg() function but it calls usb_bulk_msg() directly > so it probably does not matter... > Otherwise, I already found out that sending interrupt URBs to bulk endpoints > is a very bad idea (when programming Nexio support for usbtouchscreen). Alan > Stern then created a patch that checks for this. I know... it broke cxacru when the device has a bulk command endpoint. >> > >> > +#define rx_incomplete (dev->data[0]) >> > +#define rx_remainder (dev->data[1]) >> > +#define incomplete_data (dev->data[2]) >> >> This doesn't make the rest of the code particularly readable. > > I agree. Maybe I should abuse data[0] as a pointer to private data... > This data[] array does not seem like a good thing. Various usbnet drivers > abuse it in various ways. It should probably be removed and replaced by one > priv pointer. There's driver_priv, added in 2008 and used only by rndis_wlan. >> > + /* we can send at most 1514 bytes of data (+ 2-byte header) per URB */ >> > + dev->hard_mtu = CX82310_MTU + dev->net->hard_header_len; >> >> Have you tried sending larger packets? >> With another 8 bytes it would support 802.1Q (VLAN). > > Larger packets seem to be dropped. No surprise as the router firmware does not > support VLANs either. I hadn't considered that it'd need to be able to receive/transmit the larger packets over the built-in ethernet ports too. -- Simon Arlott -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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