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* Add another MBUF_STRESS_TEST feature, m_defragrandomfailures.silby2003-04-151-0/+15
| | | | | | | When enabled, this causes m_defrag to randomly return NULL (following its normal failure case so that extra memory leaks are not introduced.) Code similar to this was used to find / fix a few bugs last week.
* Move MAC label storage for mbufs into m_tags from the m_pkthdr structure,rwatson2003-04-141-15/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | returning some additional room in the first mbuf in a chain, and avoiding feature-specific contents in the mbuf header. To do this: - Modify mbuf_to_label() to extract the tag, returning NULL if not found. - Introduce mac_init_mbuf_tag() which does most of the work mac_init_mbuf() used to do, except on an m_tag rather than an mbuf. - Scale back mac_init_mbuf() to perform m_tag allocation and invoke mac_init_mbuf_tag(). - Replace mac_destroy_mbuf() with mac_destroy_mbuf_tag(), since m_tag's are now GC'd deep in the m_tag/mbuf code rather than at a higher level when mbufs are directly free()'d. - Add mac_copy_mbuf_tag() to support m_copy_pkthdr() and related notions. - Generally change all references to mbuf labels so that they use mbuf_to_label() rather than &mbuf->m_pkthdr.label. This required no changes in the MAC policies (yay!). - Tweak mbuf release routines to not call mac_destroy_mbuf(), tag destruction takes care of it for us now. - Remove MAC magic from m_copy_pkthdr() and m_move_pkthdr() -- the existing m_tag support does all this for us. Note that we can no longer just zero the m_tag list on the target mbuf, rather, we have to delete the chain because m_tag's will already be hung off freshly allocated mbuf's. - Tweak m_tag copying routines so that if we're copying a MAC m_tag, we don't do a binary copy, rather, we initialize the new storage and do a deep copy of the label. - Remove use of MAC_FLAG_INITIALIZED in a few bizarre places having to do with mbuf header copies previously. - When an mbuf is copied in ip_input(), we no longer need to explicitly copy the label because it will get handled by the m_tag code now. - No longer any weird handling of MAC labels in if_loop.c during header copies. - Add MPC_LOADTIME_FLAG_LABELMBUFS flag to Biba, MLS, mac_test. In mac_test, handle the label==NULL case, since it can be dynamically loaded. In order to improve performance with this change, introduce the notion of "lazy MAC label allocation" -- only allocate m_tag storage for MAC labels if we're running with a policy that uses MAC labels on mbufs. Policies declare this intent by setting the MPC_LOADTIME_FLAG_LABELMBUFS flag in their load-time flags field during declaration. Note: this opens up the possibility of post-boot policy modules getting back NULL slot entries even though they have policy invariants of non-NULL slot entries, as the policy might have been loaded after the mbuf was allocated, leaving the mbuf without label storage. Policies that cannot handle this case must be declared as NOTLATE, or must be modified. - mac_labelmbufs holds the current cumulative status as to whether any policies require mbuf labeling or not. This is updated whenever the active policy set changes by the function mac_policy_updateflags(). The function iterates the list and checks whether any have the flag set. Write access to this variable is protected by the policy list; read access is currently not protected for performance reasons. This might change if it causes problems. - Add MAC_POLICY_LIST_ASSERT_EXCLUSIVE() to permit the flags update function to assert appropriate locks. - This makes allocation in mac_init_mbuf() conditional on the flag. Reviewed by: sam Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
* Use MBTOM() to convert mbuf allocator flags to malloc() flags, ratherrwatson2003-04-141-2/+1
| | | | | | | than using the same compare/substitute in many places. Obtained from: TrustedBSD Project Sponsored by: DARPA, Network Associates Laboratories
* Introduce an M_ASSERTPKTHDR() macro which performs the very common taskdes2003-04-081-4/+3
| | | | | | | of asserting that an mbuf has a packet header. Use it instead of hand- rolled versions wherever applicable. Submitted by: Hiten Pandya <hiten@unixdaemons.com>
* Add the m_defrag routine, as discussed on committers@. Thissilby2003-03-291-0/+83
| | | | | | | incarnation should address the concerns of all in the discussion, and keeps statistics which show how much it is used. MFC after: 2 weeks
* Allow m_dup_pkthdr to accept mbufs with attached clusters assilby2003-03-281-3/+3
| | | | | | targets. Submitted by: bmilekic
* In m_dup_pkthdr(), convert the supplied `how' argument into mallociedowse2003-03-131-1/+2
| | | | | flags when passing it into m_tag_copy_chain(), as m_tag* functions use malloc, not mbuf flags.
* Back out M_* changes, per decision of the TRB.imp2003-02-191-7/+7
| | | | Approved by: trb
* Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.alfred2003-01-211-7/+7
| | | | Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT.
* Correct mbuf packet header propagation. Previously, packet headerssam2002-12-301-14/+54
| | | | | | | | | | | | | | | | | | | | | | were sometimes propagated using M_COPY_PKTHDR which actually did something between a "move" and a "copy" operation. This is replaced by M_MOVE_PKTHDR (which copies the pkthdr contents and "removes" it from the source mbuf) and m_dup_pkthdr which copies the packet header contents including any m_tag chain. This corrects numerous problems whereby mbuf tags could be lost during packet manipulations. These changes also introduce arguments to m_tag_copy and m_tag_copy_chain to specify if the tag copy work should potentially block. This introduces an incompatibility with openbsd which we may want to revisit. Note that move/dup of packet headers does not handle target mbufs that have a cluster bound to them. We may want to support this; for now we watch for it with an assert. Finally, M_COPYFLAGS was updated to include M_FIRSTFRAG|M_LASTFRAG. Supported by: Vernier Networks Reviewed by: Robert Watson <rwatson@FreeBSD.org>
* Replace aux mbufs with packet tags:sam2002-10-161-1/+1
| | | | | | | | | | | | | | | | | | | o instead of a list of mbufs use a list of m_tag structures a la openbsd o for netgraph et. al. extend the stock openbsd m_tag to include a 32-bit ABI/module number cookie o for openbsd compatibility define a well-known cookie MTAG_ABI_COMPAT and use this in defining openbsd-compatible m_tag_find and m_tag_get routines o rewrite KAME use of aux mbufs in terms of packet tags o eliminate the most heavily used aux mbufs by adding an additional struct inpcb parameter to ip_output and ip6_output to allow the IPsec code to locate the security policy to apply to outbound packets o bump __FreeBSD_version so code can be conditionalized o fixup ipfilter's call to ip_output based on __FreeBSD_version Reviewed by: julian, luigi (silent), -arch, -net, darren Approved by: julian, silence from everyone else Obtained from: openbsd (mostly) MFC after: 1 month
* While well intentionned the check to see it there is a packetjulian2002-09-191-3/+0
| | | | | | | | | | | header and return that length, was misguided. The check itself didn't take into account the fact that the mbuf pointer pased in may be null, and the function is defined specifically for cases where the caller knows what it wants. Rather than fix the check I'm removing it as phk suggested. Submitted by: phk@freebsd.org
* fix style.. Return in the kernel always has () around the arguments.julian2002-09-191-1/+1
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* Compiler was correct:julian2002-09-191-1/+1
| | | | m WAS being used uninitialized..
* If M_PKTHDR is set then we don't need to do a loop to find the total length.darrenr2002-09-191-0/+3
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* style nit: unsigned -> u_int in the kernel, particularly tobmilekic2002-09-181-11/+11
| | | | | | | stay consistent in this file, and keep m_length() and m_fixhdr() consistent with their prototypes in mbuf.h Inspired by: bde
* Make m_length() and m_fixhdr() return unsigned.phk2002-09-181-4/+4
| | | | Suggested by: arr
* Introduce the m_length() function which will return the accumulatedphk2002-09-181-6/+19
| | | | length of an mbuf-chain and optionally a pointer to the last mbuf.
* Move m_fixhdr() from "mbchain" to "mbuf" where it belongs.phk2002-09-181-0/+14
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* Include file cleanup; mac.h and malloc.h at one point had orderingrwatson2002-08-011-1/+1
| | | | | | relationship requirements, and no longer do. Reminded by: bde
* Introduce support for Mandatory Access Control and extensiblerwatson2002-07-311-0/+14
| | | | | | | | | | | | | | | kernel access control. Invoke additional MAC entry points when an mbuf packet header is copied to another mbuf: release the old label if any, reinitialize the new header, and ask the MAC framework to copy the header label data. Note that this requires a potential allocation operation, but m_copy_pkthdr() is not permitted to fail, so we must block. Since we now use interrupt threads, this is possible, but not desirable. Obtained from: TrustedBSD Project Sponsored by: DARPA, NAI Labs
* Make M_COPY_PKTHDR() macro into a wrapper for a m_copy_pkthdr()rwatson2002-07-301-0/+19
| | | | | | | | | | function. This permits conditionally compiled extensions to the packet header copying semantic, such as extensions to copy MAC labels. Reviewed by: bmilekic Obtained from: TrustedBSD Project Sponsored by: DARPA, NAI Labs
* Move m_freem() from uipc_mbuf.c to subr_mbuf.c so it can take advantagebmilekic2002-07-241-8/+0
| | | | | | | | | | | of the inlines, like its cousin, m_free(). Also, make a small (first step?) optimisation of m_free() to use the MBP_PERSIST{,ENT} interface to hold the lock across frees when possible. The thing is that right now, we can only do this easily for at most across one mbuf + one cluster free, as the comment mentions (it also explains why). Anyway, some basic tests revealed a 5-10% overall improvement. Some of the results can be found here: http://people.freebsd.org/~bmilekic/code/measure.txt
* o Introduce new m_getcl() interface routine that allocates an mbufbmilekic2002-07-151-66/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | and a cluster in one shot. o Introduce MBP_PERSIST and MBP_PERSISTENT control bits to mb_alloc(); MBP_PERSIST means "if you can allocate, then keep the cache lock held on exit," and MBP_PERSISTENT means "a cache lock is alredy held on entry, so allocate from the specified (already locked) cache." They may be used in combination. o m_getcl() uses the MBP_PERSIST/MBP_PERSISTENT interface so that it doesn't drop the cache lock in between the mbuf and cluster allocations. o m_getm(), which takes a size and allocates an mbuf + cluster "best fit" chain, has been moved from uipc_mbuf.c to subr_mbuf.c and shown how to use MBP_PERSIST/MBP_PERSISTENT to attempt to do a grouped allocation without dropping the cache lock in between. Why this is good: much less bus-locked lock acquires/drops when they're not needed. Also, prototype for m_getcl(): struct mbuf * m_getcl(int how, short type, int flags); "how" and "type" are self-explanatory. "flags" may be M_PKTHDR, in which case m_getcl() will make the mbuf a pkthdr-mbuf. While I'm in subr_mbuf.c: o Every exported routine now has a nice comment with a description of the expected arguments. Eventually, mbuf(9) needs to be re-vamped but there's still more code to write/finalize before I get to that. o internal macros have been changed a bit. o consistently use 'short' for "type." This somehow slipped through before (that 'type' was sometimes declared as int). Alfred has been pushing for the MBP_PERSIST{,ENT} thing for almost a year now. Luigi asked for m_getcl(), and will probably MFC that part of this commit. TODO [Related]: teach mb_free() about MBP_PERSIST{, ENT}.
* Fix a bug in m_split(): the "m->m_ext.ext_size" field of an mbuf was beingarchie2002-05-311-1/+5
| | | | | | | | | | | | | set to zero. This field indicates the total space in the external buffer and therefore should not be modified after the external buffer is added. Add a comment warning that the mbufs returned by m_split() might be read-only. Fix M_TRAILINGSPACE() to return zero if !M_WRITABLE(m). Reviewed by: freebsd-net Obtained from: Vernier Networks, Inc. MFC after: 1 week
* Fix corner case where m_len was not being initialized.hsu2002-04-121-1/+3
| | | | | Submitted by: Maksim Yevmenkin <myevmenk@digisle.net> MFC after: 1 week
* Get rid of the twisted MFREE() macro entirely.dillon2002-02-051-8/+3
| | | | | Reviewed by: dg, bmilekic MFC after: 3 days
* Update to C99, s/__FUNCTION__/__func__/.obrien2001-12-101-2/+2
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* Forgot to remove this un-needed test. (M_WAITOK won't fail)julian2001-08-191-1/+1
| | | | | | | | | I vaguely remember someone once proving it COULD return NULL.. was that changed? Reminded by: BDE MFC after: 2 weeks
* Introduce numerous SMP friendly changes to the mbuf allocator. Namely,bmilekic2001-06-221-461/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | introduce a modified allocation mechanism for mbufs and mbuf clusters; one which can scale under SMP and which offers the possibility of resource reclamation to be implemented in the future. Notable advantages: o Reduce contention for SMP by offering per-CPU pools and locks. o Better use of data cache due to per-CPU pools. o Much less code cache pollution due to excessively large allocation macros. o Framework for `grouping' objects from same page together so as to be able to possibly free wired-down pages back to the system if they are no longer needed by the network stacks. Additional things changed with this addition: - Moved some mbuf specific declarations and initializations from sys/conf/param.c into mbuf-specific code where they belong. - m_getclr() has been renamed to m_get_clrd() because the old name is really confusing. m_getclr() HAS been preserved though and is defined to the new name. No tree sweep has been done "to change the interface," as the old name will continue to be supported and is not depracated. The change was merely done because m_getclr() sounds too much like "m_get a cluster." - TEMPORARILY disabled mbtypes statistics displaying in netstat(1) and systat(1) (see TODO below). - Fixed systat(1) to display number of "free mbufs" based on new per-CPU stat structures. - Fixed netstat(1) to display new per-CPU stats based on sysctl-exported per-CPU stat structures. All infos are fetched via sysctl. TODO (in order of priority): - Re-enable mbtypes statistics in both netstat(1) and systat(1) after introducing an SMP friendly way to collect the mbtypes stats under the already introduced per-CPU locks (i.e. hopefully don't use atomic() - it seems too costly for a mere stat update, especially when other locks are already present). - Optionally have systat(1) display not only "total free mbufs" but also "total free mbufs per CPU pool." - Fix minor length-fetching issues in netstat(1) related to recently re-enabled option to read mbuf stats from a core file. - Move reference counters at least for mbuf clusters into an unused portion of the cluster itself, to save space and need to allocate a counter. - Look into introducing resource freeing possibly from a kproc. Reviewed by (in parts): jlemon, jake, silby, terry Tested by: jlemon (Intel & Alpha), mjacob (Intel & Alpha) Preliminary performance measurements: jlemon (and me, obviously) URL: http://people.freebsd.org/~bmilekic/mb_alloc/
* Change m_devget()'s outdated and unused `offset' argument to actually meanbmilekic2001-06-201-30/+25
| | | | | | | | | | | | | | | | | | | | something: offset into the first mbuf of the target chain before copying the source data over. Make drivers using m_devget() with a first argument "data - ETHER_ALIGN" to use the offset argument to pass ETHER_ALIGN in. The way it was previously done is potentially dangerous if the source data was at the top of a page and the offset caused the previous page to be copied (if the previous page has not yet been appropriately mapped). The old `offset' argument in m_devget() is not used anywhere (it's always 0) and dates back to ~1995 (and earlier?) when support for ethernet trailers existed. With that support gone, it was merely collecting dust. Tested on alpha by: jlemon Partially submitted by: jlemon Reviewed by: jlemon MFC after: 3 weeks
* Patch up a blunder I made a few days ago. nmbcnt was being initializedpeter2001-06-131-6/+15
| | | | | | | too late. Noted by: bmilekic Pointy-hat to: peter
* Sync with recent KAME.ume2001-06-111-9/+0
| | | | | | | | | | | | | | | | | | This work was based on kame-20010528-freebsd43-snap.tgz and some critical problem after the snap was out were fixed. There are many many changes since last KAME merge. TODO: - The definitions of SADB_* in sys/net/pfkeyv2.h are still different from RFC2407/IANA assignment because of binary compatibility issue. It should be fixed under 5-CURRENT. - ip6po_m member of struct ip6_pktopts is no longer used. But, it is still there because of binary compatibility issue. It should be removed under 5-CURRENT. Reviewed by: itojun Obtained from: KAME MFC after: 3 weeks
* "Fix" the previous initial attempt at fixing TUNABLE_INT(). This timepeter2001-06-081-3/+3
| | | | | | | around, use a common function for looking up and extracting the tunables from the kernel environment. This saves duplicating the same function over and over again. This way typically has an overhead of 8 bytes + the path string, versus about 26 bytes + the path string.
* Back out part of my previous commit. This was a last minute changepeter2001-06-071-3/+3
| | | | | and I botched testing. This is a perfect example of how NOT to do this sort of thing. :-(
* Make the TUNABLE_*() macros look and behave more consistantly like thepeter2001-06-061-9/+15
| | | | | SYSCTL_*() macros. TUNABLE_INT_DECL() was an odd name because it didn't actually declare the int, which is what the name suggests it would do.
* Back out jesper's 2001/05/31 14:58:11 PDT commit. It does not compile.obrien2001-06-011-0/+5
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* Move the definition of NMBCLUSTERS from src/sys/kern/uipc_mbuf.cjesper2001-05-311-5/+0
| | | | | | | to <sys/param.h>, so it's available to src/sys/netinet/ip_input.c, and remove the now unneeded includes of "opt_param.h". MFC after: 1 week
* Increment mbstat.m_mpfail, not mbstat.m_mcfail, when m_pullup() fails.bmilekic2001-05-231-1/+1
| | | | This slipped in accidently a few commits back.
* Undo part of the tangle of having sys/lock.h and sys/mutex.h included inmarkm2001-05-011-2/+4
| | | | | | | | | | | other "system" header files. Also help the deprecation of lockmgr.h by making it a sub-include of sys/lock.h and removing sys/lockmgr.h form kernel .c files. Sort sys/*.h includes where possible in affected files. OK'ed by: bde (with reservations)
* Fix inconsistency in setup of kernel_map: we need to make sure thatbmilekic2001-04-181-4/+5
| | | | | | | | we also reserve _adequate_ space for the mb_map submap; i.e. we need space for nmbclusters, nmbufs, _and_ nmbcnt. Furthermore, we need to rounddown, and not roundup, so that we are consistent. Pointed out by: bde
* - Change the msleep()s to condition variables.bmilekic2001-04-031-21/+21
| | | | | | | | The mbuf and mcluster free lists now each "own" a condition variable, m_starved. - Clean up minor indentention issues in sys/mbuf.h caused by previous commit.
* Use only one mutex for the entire mbuf subsystem.alfred2001-04-031-44/+47
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Don't use atomic operations for the stats updating, instead protect the counts with the mbuf mutex. Most twiddling of the stats was done right before or after releasing a mutex. By doing this we reduce the number of locked ops needed as well as allow a sysctl to gain a consitant view of the entire stats structure. In the future... This will allow us to chain common mbuf operations that would normally need to aquire/release 2 or 3 of the locks to build an mbuf with a cluster or external data attached into a single op requiring only one lock. Simplify the per-cpu locks that are planned. There's also some if (1) code that should check if the "how" operation specifies blocking/non-blocking behavior, we _could_ make it so that we hold onto the mutex through calls into kmem_alloc when non-blocking requests are made, but for safety reasons we currently drop and reaquire the mutex around the calls. Also, note that calling kmem_alloc is rare and only happens during a shortage so drop/re-getting the mutex will not be a common occurance. Remove some #define's that seemed to obfuscate the code to me. Remove an extranious comment. Remove an XXX, including mutex.h isn't a crime. Reviewed by: bmilekic
* Move the atomic() mbstat.m_drops incrementing to the MGET(HDR) andbmilekic2001-03-241-19/+5
| | | | | | | MCLGET macros in order to avoid incrementing the drop count twice. Otherwise, in some cases, we may increment m_drops once in m_mballoc() for example, and increment it again in m_mballoc_wait() if the wait fails.
* Fix a couple of things in the internal mbuf allocation interface:bmilekic2001-03-171-8/+8
| | | | | | | | | | | | | | | - Make sure that m_mballoc() really doesn't allow over nmbufs mbufs to be allocated from mb_map. In the case where nmbufs-reserved space is not an exact multiple of PAGE_SIZE (which it should be, but anyway...), we hold nmbufs as an absolute maximum which need not ever be reached. - Clean up m_clalloc(); make it more consistent in the sense that the first argument `ncl' really means "the number of clusters ensured to be allocated" and not "the number of pages worth of clusters to be allocated," as was previously the case. This also makes it consistent with m_mballoc() as well as the comment that preceeds it. Reviewed by: jlemon
* Fix parameter order in the calls to MGET().bp2001-02-211-2/+2
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* Preserve alignment of first mbuf in m_copypacket.luigi2001-02-201-0/+4
| | | | | | | | This is useful when doing copies of packet where some leading space has been preallocated to insert protocol headers. Note that there are in fact almost no users of m_copypacket. MFC candidate.
* Implement m_getm() which will perform an "all or nothing" mbuf + clusterbmilekic2001-02-141-1/+67
| | | | | | | | | | | | | | | | | | | | | allocation, as required. If m_getm() receives NULL as a first argument, then it allocates `len' (second argument) bytes worth of mbufs + clusters and returns the chain only if it was able to allocate everything. If the first argument is non-NULL, then it should be an existing mbuf chain (e.g. pre-allocated mbuf sitting on a ring, on some list, etc.) and so it will allocate `len' bytes worth of clusters and mbufs, as needed, and append them to the tail of the passed in chain, only if it was able to allocate everything requested. If allocation fails, only what was allocated by the routine will be freed, and NULL will be returned. Also, get rid of existing m_getm() in netncp code and replace calls to it to calls to this new generic code. Heavily Reviewed by: bp
* Long awaited style fixup in mbuf code. Get rid of K&R style prototypingbmilekic2001-02-111-129/+87
| | | | | | and function argument declarations. Make sure that functions that are supposed to return a pointer return NULL in case of failure. Don't cast NULL. Finally, get rid of annoying `register' uses.
* Change and clean the mutex lock interface.bmilekic2001-02-091-15/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
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