May 2005 - Darwin-kernel - lists.apple.com

Re: VNODE sample under Tiger
by Mike Smith 03 May '05

03 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On May 3, 2005, at 1:04 PM, Pezeshgi, Shahriar wrote: Mike I know this is not good thing to do but we need it because of: 1) Reading configuration 2) Reading L1 code To have more idea, our driver has been developed under ProjectBuilder and OS X 10.1. The same binary can work under 10.2 and 10.3 but for Tiger it's complaining about some missing symbols like _vn_open or _vn_rdwr and finally it's failing to load the driver. vn_open is not available in 10.4. As John pointed out, it's replaced by vnode_open for those applications that absolutely cannot do the right thing and must work with files inside the kernel. = Mike _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… There's no reason you can't upload these into your driver from a user- space helper application, and you should. This email sent to site_archiver(a)lists.apple.com

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Re: Accessing to a file from a KEXT
by Mike Smith 03 May '05

03 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On May 2, 2005, at 8:00 AM, Pezeshgi, Shahriar wrote: As John noted in his followup, this approach is strongly frowned upon. Since you need to rev your driver for Tiger anyway, consider taking a little extra time to do it the right way... = Mike _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… Hi there I have a problem with our USB DSL Modem driver under new OS X (Tiger). Basically we need to read a configuration file during driver startup ( I know that it's a BAD idea to access to file system from a KEXT but this is the way our driver has been developed originally under OS X 10.1). This driver is working properly under different version of OS X (10.1.x, 10.2.x and 10.3.x) but it's not working under Tiger, it's complaining about missing symbols like _vn_open, _vn_close and etc. I think new vnode api doesn't support old functions under Tiger (am I right?), so I looked at KPI->vnode documents but there is no descriptions for functions like vnode_open, vnode_close and etc. Where can I find more details about vnode api? This email sent to site_archiver(a)lists.apple.com

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RE: VNODE sample under Tiger
by Pezeshgi, Shahriar 03 May '05

03 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcVQGqHeqFInpvuYQGy9GvVWlpvuAwAACqXQ Thread-topic: VNODE sample under Tiger Mike I know this is not good thing to do but we need it because of: 1) Reading configuration 2) Reading L1 code To have more idea, our driver has been developed under ProjectBuilder and OS X 10.1. The same binary can work under 10.2 and 10.3 but for Tiger it's complaining about some missing symbols like _vn_open or _vn_rdwr and finally it's failing to load the driver. Shahriar Pezeshgi Analog Devices High Speed Network Access Products 777 Bay Street, Suite 2303 Toronto, Ontario, Canada M5G 2C8 Tel : (+1)416-644-4981 Fax: (+1)416-598-4004 e-mail: shahriar.pezeshgi(a)analog.com -----Original Message----- From: Mike Smith [mailto:msmith@freebsd.org] Sent: Tuesday, May 03, 2005 4:00 PM To: Pezeshgi, Shahriar Cc: darwinKernel Dev Subject: Re: VNODE sample under Tiger Performing file I/O inside the kernel is *strongly* discouraged. Whenever possible, you should use a user-space helper application. What are you trying to do that requires you to handle files inside the kernel? = Mike On May 3, 2005, at 9:45 AM, Pezeshgi, Shahriar wrote: > Hi > Are the following functions supported in Tiger? > > vn_open, vn_close and vn_rdwr. Also is it true that funneling is not > needed? > > If no, are the following do the same thing under Tiger? > > vnode_open, vnode_close, ????. Are these supported under 10.2 or 10.3? > > If no, what are current functions to have low level access to vfs? > > Shahriar > > -----Original Message----- > From: darwin-kernel-bounces > +shahriar.pezeshgi=analog.com(a)lists.apple.com > [mailto:darwin-kernel-bounces > +shahriar.pezeshgi=analog.com(a)lists.apple.c > om] On Behalf Of Justin Walker > Sent: Monday, May 02, 2005 5:16 PM > To: darwinKernel Dev > Subject: Re: VNODE sample under Tiger > > > On May 2, 2005, at 11:57, Pezeshgi, Shahriar wrote: > > >> Hi all >> Can someone help me with this question? >> >> Where can I find information regarding vnode_open, vnode_close and >> etc >> > > >> function in Tiger? They should be in kernel source code but I haven't >> find them, I need exact file or project name. >> > > cd to the top-level directory (xnu-xxx), and execute "make cscope". > Then use cscope(1) (see the man page); it will help you find what you > want. > > Regards, > > Justin > > -- > Justin C. Walker, Curmudgeon-At-Large > Institute for General Semantics > -------- > If you're not confused, > You're not paying attention > -------- > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-kernel/ > shahriar.pezeshgi%4 > 0analog.com > > This email sent to shahriar.pezeshgi(a)analog.com > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-kernel/drivers%40mu.org > > This email sent to drivers(a)mu.org > _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: VNODE sample under Tiger
by Shawn Erickson 03 May '05

03 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On May 3, 2005, at 6:26 AM, Pezeshgi, Shahriar wrote: Thanks Another question, maybe silly one. How can I download the source code using CVS? What are CVS settings? -Shawn _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… You can't. Apple doesn't provide CVS access to source just web viewing or tar balls. Consider using <http://darwinsource.opendarwin.org/> since you can use rsync, etc. to pull the tar balls. This email sent to site_archiver(a)lists.apple.com

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RE: VNODE sample under Tiger
by Pezeshgi, Shahriar 03 May '05

03 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcVPaxY2ZEFnvBDaQOGkKEydQc9GQAAk3P2w Thread-topic: VNODE sample under Tiger Hi Are the following functions supported in Tiger? vn_open, vn_close and vn_rdwr. Also is it true that funneling is not needed? If no, are the following do the same thing under Tiger? vnode_open, vnode_close, ????. Are these supported under 10.2 or 10.3? If no, what are current functions to have low level access to vfs? Shahriar -----Original Message----- From: darwin-kernel-bounces+shahriar.pezeshgi=analog.com(a)lists.apple.com [mailto:darwin-kernel-bounces+shahriar.pezeshgi=analog.com@lists.apple.c om] On Behalf Of Justin Walker Sent: Monday, May 02, 2005 5:16 PM To: darwinKernel Dev Subject: Re: VNODE sample under Tiger On May 2, 2005, at 11:57, Pezeshgi, Shahriar wrote: > Hi all > Can someone help me with this question? > > Where can I find information regarding vnode_open, vnode_close and etc > function in Tiger? They should be in kernel source code but I haven't > find them, I need exact file or project name. cd to the top-level directory (xnu-xxx), and execute "make cscope". Then use cscope(1) (see the man page); it will help you find what you want. Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large Institute for General Semantics -------- If you're not confused, You're not paying attention -------- _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/shahriar.pezeshgi%4 0analog.com This email sent to shahriar.pezeshgi(a)analog.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: mbuf_outbound_finalize and TCP_SUM16 hardware checksum
by Josh Graessley 03 May '05

03 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi Anton, Please file a bug and forward me the radar number. Thanks, -josh On May 3, 2005, at 5:04 AM, Anton Kuzmin wrote: Hello, Regards, Anton This email sent to jgraessley(a)apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… I wonder if this is a known problem (or me missing something obvious) - outgoing TCP packets to be sent via the built-in ethernet device (GMace) appear to have only MBUF_CSUM_REQ_SUM16 hardware checksum request flag set as seen by an output KPI interface filter, which needs to modify the packet and therefore calls mbuf_outbound_finalize to do the delayed checksums. But from the xnu source it seems that this function has no knowledge of this flag and does nothing to calculate the checksum. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/jgraessley% 40apple.com This email sent to site_archiver(a)lists.apple.com

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Re: sbdrop - count not zero?
by Justin Walker 03 May '05

03 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On May 3, 2005, at 8:59, Stephane Sudre wrote: Cheers, Justin -- Justin C. Walker, Curmudgeon-At-Large Institute for General Semantics -------- When LuteFisk is outlawed, Only outlaws will have LuteFisk -------- _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… On 2 mai 05, at 19:05, Justin Walker wrote: [snip] File the bug, with context info, in the fond hope that the information may help isolate the problems. It's going to be difficult to isolate it because it looks like it's occurring when download big QuickTime movies via the QuickTime Plug-in. On a very few occasions, the movie will stop downloading and sometimes after that the sbdrop log record will appear. But as I'm using a build version which is the GM minus 3, may be it has been fixed since. Fortunately, you don't have to isolate it; just report what you are doing, and what the repeatablity factor is. The Pros from Dover will take over :-} This email sent to site_archiver(a)lists.apple.com

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Re: sbdrop - count not zero?
by Stephane Sudre 03 May '05

03 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On 2 mai 05, at 19:05, Justin Walker wrote: On May 2, 2005, at 9:26, Stephane Sudre wrote: On 2 mai 05, at 17:44, Justin Walker wrote: On May 2, 2005, at 7:11, Stephane Sudre wrote: I've seen this strange kernel lof record in system.log on 10.4: There's always madness in method :-} _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… "kernel[2] sbdrop - count not zero" It means that, in the process of clearing out a sockbuf (dropping a specified number of bytes), the mbuf chain ran out before the count got to zero. It used to be a panic, but has been replaced by printf/log. File a bug. Filing a bug report to tell them to put back a panic() call? I'm not that mad :) File the bug, with context info, in the fond hope that the information may help isolate the problems. It's going to be difficult to isolate it because it looks like it's occurring when download big QuickTime movies via the QuickTime Plug-in. On a very few occasions, the movie will stop downloading and sometimes after that the sbdrop log record will appear. But as I'm using a build version which is the GM minus 3, may be it has been fixed since. This email sent to site_archiver(a)lists.apple.com

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RE: VNODE sample under Tiger
by Pezeshgi, Shahriar 03 May '05

03 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Thread-index: AcVPaxY2ZEFnvBDaQOGkKEydQc9GQAAeHC8g Thread-topic: VNODE sample under Tiger Thanks Another question, maybe silly one. How can I download the source code using CVS? What are CVS settings? Thanks Shahriar -----Original Message----- From: darwin-kernel-bounces+shahriar.pezeshgi=analog.com(a)lists.apple.com [mailto:darwin-kernel-bounces+shahriar.pezeshgi=analog.com@lists.apple.c om] On Behalf Of Justin Walker Sent: Monday, May 02, 2005 5:16 PM To: darwinKernel Dev Subject: Re: VNODE sample under Tiger On May 2, 2005, at 11:57, Pezeshgi, Shahriar wrote: > Hi all > Can someone help me with this question? > > Where can I find information regarding vnode_open, vnode_close and etc > function in Tiger? They should be in kernel source code but I haven't > find them, I need exact file or project name. cd to the top-level directory (xnu-xxx), and execute "make cscope". Then use cscope(1) (see the man page); it will help you find what you want. Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large Institute for General Semantics -------- If you're not confused, You're not paying attention -------- _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/shahriar.pezeshgi%4 0analog.com This email sent to shahriar.pezeshgi(a)analog.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: mbuf_outbound_finalize and TCP_SUM16 hardware checksum
by Andrew Gallatin 03 May '05

03 May '05

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Anton Kuzmin writes: > Hello, > > I wonder if this is a known problem (or me missing something obvious) - > outgoing TCP packets to be sent via the built-in ethernet device (GMace) > appear to have only MBUF_CSUM_REQ_SUM16 hardware checksum request flag > set as seen by an output KPI interface filter, which needs to modify the > packet and therefore calls mbuf_outbound_finalize to do the delayed > checksums. But from the xnu source it seems that this function has no > knowledge of this flag and does nothing to calculate the checksum. It sounds like a bug. >From what I understand, CSUM_TCP_SUM16 is just a special case of CSUM_TCP. See bsd/netinet/ip_output.c. You might try just "silently upgrading" to MBUF_CSUM_REQ_TCP when you call mbuf_outbound_finalize(). That brings up another annoying point, which is that mbuf_set_csum_requested() is marked KERNEL_PRIVATE, and not in the headers (though it is callable). I discovered this yesterday when implementing my own mbuf compression code to work around getPhysicalSegmentsWithCoalesce() being broken. Another bug in mbuf_outbound_finalize() (actually in in_delayed_cksum_offset()) is that it only works on big endian hosts. On little endian hosts, ip->ip_len must be byteswapped back into host byte order, otherwise in_delayed_cksum_offset() will call in_cksum_skip() with a bogus ip->ip_len. I learned this the hard way when writing my own sort of mbuf_outbound_finalize() for a driver on FreeBSD quite a while ago. Drew _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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