IXGB networl driver and locking

[sivakumar.subramani at wipro.com]

Hi all,
 
Same lock is being used in ixgb_intr and ixgb_start. If we get Receive
interrupt while processing Xmit (ixgb_start), Will the calling of
ixgb_intr() handler be delayed as we will not be getting lock in
ixgb_intr since it is already locked in ixgb_start. If it is the case,
are we making it as Half duplex, I mean we are allowing either of one Tx
(or) Rx. Please clarify.
 
488 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L488>
ixgb_start <http://fxr.watson.org/fxr/ident?i=ixgb_start> (struct ifnet
<http://fxr.watson.org/fxr/ident?i=ifnet>  *ifp
<http://fxr.watson.org/fxr/ident?i=ifp> )
489 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L489>  {
490 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L490>
struct adapter <http://fxr.watson.org/fxr/ident?i=adapter>  *adapter
<http://fxr.watson.org/fxr/ident?i=adapter>  = ifp
<http://fxr.watson.org/fxr/ident?i=ifp> ->if_softc;
491 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L491>  
492 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L492>
IXGB_LOCK <http://fxr.watson.org/fxr/ident?i=IXGB_LOCK> (adapter
<http://fxr.watson.org/fxr/ident?i=adapter> );
493 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L493>
ixgb_start_locked <http://fxr.watson.org/fxr/ident?i=ixgb_start_locked>
(ifp <http://fxr.watson.org/fxr/ident?i=ifp> );
494 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L494>
IXGB_UNLOCK <http://fxr.watson.org/fxr/ident?i=IXGB_UNLOCK> (adapter
<http://fxr.watson.org/fxr/ident?i=adapter> );
495 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L495>
return;
496 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L496>  }

 
 
static void
795 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L795>
ixgb_intr <http://fxr.watson.org/fxr/ident?i=ixgb_intr> (void *arg
<http://fxr.watson.org/fxr/ident?i=arg> )
796 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L796>  {
.............
............
IXGB_LOCK <http://fxr.watson.org/fxr/ident?i=IXGB_LOCK> (adapter
<http://fxr.watson.org/fxr/ident?i=adapter> );
.....................
IXGB_UNLOCK <http://fxr.watson.org/fxr/ident?i=IXGB_UNLOCK> (adapter
<http://fxr.watson.org/fxr/ident?i=adapter> );

 
Thanks,
~Siva



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