Date: Tue, 15 May 2007 12:22:08 +0530 From: <sivakumar.subramani@wipro.com> To: <freebsd-net@freebsd.org> Subject: IXGB networl driver and locking Message-ID: <821C7AD2A9F78942B8605979226257739CFBF5@blr-m3-msg.wipro.com>
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Hi all, =20 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. =20 488 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L488>; ixgb_start <http://fxr.watson.org/fxr/ident?i=3Dixgb_start>; (struct ifnet <http://fxr.watson.org/fxr/ident?i=3Difnet>; *ifp <http://fxr.watson.org/fxr/ident?i=3Difp>; ) 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=3Dadapter>; *adapter <http://fxr.watson.org/fxr/ident?i=3Dadapter>; =3D ifp <http://fxr.watson.org/fxr/ident?i=3Difp>; ->if_softc; 491 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L491>; =20 492 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L492>; IXGB_LOCK <http://fxr.watson.org/fxr/ident?i=3DIXGB_LOCK>; (adapter <http://fxr.watson.org/fxr/ident?i=3Dadapter>; ); 493 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L493>; ixgb_start_locked <http://fxr.watson.org/fxr/ident?i=3Dixgb_start_locked>; (ifp <http://fxr.watson.org/fxr/ident?i=3Difp>; ); 494 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L494>; IXGB_UNLOCK <http://fxr.watson.org/fxr/ident?i=3DIXGB_UNLOCK>; (adapter <http://fxr.watson.org/fxr/ident?i=3Dadapter>; ); 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>; } =20 =20 static void 795 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L795>; ixgb_intr <http://fxr.watson.org/fxr/ident?i=3Dixgb_intr>; (void *arg <http://fxr.watson.org/fxr/ident?i=3Darg>; ) 796 <http://fxr.watson.org/fxr/source/dev/ixgb/if_ixgb.c#L796>; { ............. ............ IXGB_LOCK <http://fxr.watson.org/fxr/ident?i=3DIXGB_LOCK>; (adapter <http://fxr.watson.org/fxr/ident?i=3Dadapter>; ); ..................... IXGB_UNLOCK <http://fxr.watson.org/fxr/ident?i=3DIXGB_UNLOCK>; (adapter <http://fxr.watson.org/fxr/ident?i=3Dadapter>; ); =20 Thanks, ~Siva The information contained in this electronic message and any attachments to= this message are intended for the exclusive use of the addressee(s) and= may contain proprietary, confidential or privileged information. If you= are not the intended recipient, you should not disseminate, distribute or= copy this e-mail. Please notify the sender immediately and destroy all= copies of this message and any attachments.=20 WARNING: Computer viruses can be transmitted via email. The recipient= should check this email and any attachments for the presence of viruses.= The company accepts no liability for any damage caused by any virus= transmitted by this email. =20 www.wipro.com
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