On Wed, Feb 2, 2011 at 8:06 PM, Julian Elischer <jul...@freebsd.org> wrote: > On 2/2/11 10:05 AM, Monthadar Al Jaberi wrote: >> >> I just tried something that seems to work, but please dont hit me ^^;;; >> >> in wtap_ioctl I assigned curthread->td_vnet myself to point to a VNET >> (saved it when the module first loaded) (I have not created any jails >> yet)... and it works... I didnt put any CURVNET macros... > > td->td_vnet is exactly what the CURVNET_SET macro sets. > You should use the Macros because we may change the place where we store it. > > The vnet for the current thread is picked up from several places depending > on the context, > and it is cleared again when it is not needed. the V_xxx usages in the code > end up being > in effect expanded to curthread->td_vnet.xxx, where each 'xxx' is sort of > like an element in a structure > but not quite. > > Now, theoretically we could just leave it set all the time but then it would > be nearly impossible > to find places where we should have changed it, but forgot and just got the > existing one. > > if you want to find the correct place to go, then look at the vnet of the > calling process > which should be in the process cred. or just use vnet0.
Can I check it from user space? > > I don't understand why you saw a CRED_TO_VNET of 0 > I was under the impression that every process/thread in the system would be > on vnet0 > in a vimage kernel. This is how my printf looks like: struct thread *td = curthread; struct vnet *v = TD_TO_VNET(td); struct ucred *cred = CRED_TO_VNET(td->ucred); struct vnet *td_vnet = td->td_vnet; printf("td=%p, td->td_vnet=%p, td->td_ucred=%p, TD_TO_VNET=%p, CRED_TO_VNET=%p\n", td, td_vnet, td->td_ucred, v, cred); I made a fast search in /usr/src for "td_vnet" and found it was assigned only in int fork1(td, flags, pages, procp): #ifdef VIMAGE td2->td_vnet = NULL; td2->td_vnet_lpush = NULL; #endif Maybe something wrong with how I declare my wtap_ioctl: static struct cdevsw wtap_cdevsw = { .d_version = D_VERSION, .d_flags = 0, .d_ioctl = wtap_ioctl, .d_name = "wtapctl", }; ... make_dev(&wtap_cdevsw,0,UID_ROOT,GID_WHEEL,0600,(const char *)"wtapctl"); > > your stored vnet idea is ok as well, but may go strange if you load the > driver from a vnet jail > and then remove the jail. Ok, will document it in the code for now > > > > >> my assumption is that if ath drivers dont use VNET I shouldnt :P >> >> What is wrong with this hack? >> >> br, >> >> P.S. I have printed "porting to vnet" text to have it always at hand, >> but its a bit hard for me... doing my best. >> >> On Wed, Feb 2, 2011 at 6:30 PM, Julian Elischer<jul...@freebsd.org> >> wrote: >>> >>> On 2/2/11 9:12 AM, Bjoern A. Zeeb wrote: >>>> >>>> On Wed, 2 Feb 2011, Monthadar Al Jaberi wrote: >>>> >>>> Hi, >>>> >>>>> Thanx makes more sense, but I have noticed something weired if you can >>>>> shade some light on. >>>>> >>>>> I added printfs one when the module is first loaded (static int >>>>> event_handler(module_t module, int event, void *arg)): >>>>> curthread=0xc3f95870 >>>>> curthread->td_vnet=0xc3170e00 >>>>> curthread->td_ucred=0xc3185d00 >>>>> TD_TO_VNET=0 >>>>> CRED_TO_VNET=0 >>>> >>>> Try to load it from laoder on boot; I think that should work as we are >>>> setting the curvent for the kernel startup. >>>> >>>> The problem you are seeing is a bug in the current implementation that >>>> you cannot add any physical network interface after the kernel started. >>>> This applies to cardbus/usb/... as well as any kind of ethernet >>>> interface, so a kldload igb should yield it as well. >>>> >>>> The fix for that is easy and hard at the same time: >>>> A) either touch all drivers >>>> B) or touch all cloned interfaces and change 3 common lines. >>>> or try to make cloners aware of vimages. >>>> >>>> Solution B) is sitting in perforce with the entire stuff that it depends >>>> on and was started with CH=179022,179255 but not limited to that if you >>>> want to have a peek. >>>> >>>> What you certainly can do locally to your driver for now is to make a >>>> change like this: >>>> >>>> +#ifdef VIMAGE >>>> + CURVNET_SET(vnet0); >>>> +#endif >>>> ifp = if_alloc(IFT_ETHER); >>>> +#ifdef VIMAGE >>>> + CURVNET_RESTORE(); >>>> +#endif >>>> >>> you don't really need the #ifdef except for readability as CURVNET_XXX >>> ar >>> enot defined for !vnet >>> >>>> It's the type A) kind of change from above that will break eventually >>>> in the future. >>>> >>>> /bz >>>> >>> >> >> > > -- //Monthadar Al Jaberi _______________________________________________ freebsd-virtualization@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "freebsd-virtualization-unsubscr...@freebsd.org"