On Sat, Dec 03, 2016 at 07:47:11PM +0100, Giuseppe Lippolis wrote:
> Dear All,
>
> > If possible you want to tell the option driver which interfaces to
> > bind to (white-listing) rather than specifying which not to bind to
> > (black-listing). The latter typically means probing all interfaces,
> > checking the black list, and then bailing out for unsupported
> > interfaces.
>
> I try to use the blacklist to specify which interface not to bind:
>
> static const struct option_blacklist_info dlink_dwm_158_ blacklist = {
> .reserved = BIT(0) | BIT(1),
> };
>
> { USB_DEVICE (0x2001, 0x7d04),
> .driver_info = (kernel_ulong_t)&dlink_dwm_158_blacklist },
>
> The result seems positive, after boot:
> T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=480 MxCh= 0
> D: Ver= 2.00 Cls=02(comm.) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
> P: Vendor=2001 ProdID=7d04 Rev= 3.00
> S: Manufacturer=D-Link,Inc
> S: Product=D-Link DWM-158
> C:* #Ifs= 7 Cfg#= 1 Atr=a0 MxPwr=500mA
> A: FirstIf#= 0 IfCount= 2 Cls=02(comm.) Sub=06 Prot=00
> I:* If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=06 Prot=00 Driver=cdc_ether
> E: Ad=88(I) Atr=03(Int.) MxPS= 64 Ivl=125us
> I: If#= 1 Alt= 0 #EPs= 0 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether
> I:* If#= 1 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_ether
> E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> I:* If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=02 Prot=01 Driver=option
> E: Ad=87(I) Atr=03(Int.) MxPS= 64 Ivl=125us
> E: Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> I:* If#= 3 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> E: Ad=83(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E: Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> I:* If#= 4 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> E: Ad=84(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E: Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> I:* If#= 5 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
> E: Ad=85(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E: Ad=05(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> I:* If#= 6 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=(none)
> E: Ad=86(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
> E: Ad=06(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
Yes, that would work, but if you look at the interface definitions above
you see that simply matching all interfaces with class 0xff (i.e.
white-listing) would suffice and is therefore preferred.
> On the kernel v4.8.12, I see similar d-link devices with the same
> VENDOR_ID declared in this way:
>
> { USB_DEVICE_AND_INTERFACE_INFO(0x2001, 0x7d01, 0xff, 0x02, 0x01) },
> /* D-Link DWM-156 (variant) */
> { USB_DEVICE_AND_INTERFACE_INFO(0x2001, 0x7d01, 0xff, 0x00, 0x00) },
> /* D-Link DWM-156 (variant) */
> { USB_DEVICE_AND_INTERFACE_INFO(0x2001, 0x7d02, 0xff, 0x02, 0x01) },
> { USB_DEVICE_AND_INTERFACE_INFO(0x2001, 0x7d02, 0xff, 0x00, 0x00) },
> { USB_DEVICE_AND_INTERFACE_INFO(0x2001, 0x7d03, 0xff, 0x02, 0x01) },
> { USB_DEVICE_AND_INTERFACE_INFO(0x2001, 0x7d03, 0xff, 0x00, 0x00) },
> { USB_DEVICE_INTERFACE_CLASS(0x2001, 0x7e19, 0xff),
> /* D-Link DWM-221 B1 */
> .driver_info = (kernel_ulong_t)&net_intf4_blacklist },
>
> Shall I declare a
> #define DLINK_VENDOR_ID 0x2001
> Or use the hardcoded style ?
Just stick to the hard-coded 0x2001 for now. There are two (or three)
other VIDs used for D-Link in option and it looks like one of them is
really the PCI vendor id.
Either way, we can clean that up later.
> Another question when is appropriate to use USB_DEVICE and when
> USB_DEVICE_INTERFACE_CLASS ?
So if you just use USB_DEVICE_INTERFACE_CLASS() you don't need to do any
blacklisting at all:
{ USB_DEVICE_INTERFACE_CLASS(0x2001, 0x7d04, 0xff) },
Thanks,
Johan
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