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* Reimplement the netisr framework in order to support parallel netisrrwatson2009-06-011-6/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | threads: - Support up to one netisr thread per CPU, each processings its own workstream, or set of per-protocol queues. Threads may be bound to specific CPUs, or allowed to migrate, based on a global policy. In the future it would be desirable to support topology-centric policies, such as "one netisr per package". - Allow each protocol to advertise an ordering policy, which can currently be one of: NETISR_POLICY_SOURCE: packets must maintain ordering with respect to an implicit or explicit source (such as an interface or socket). NETISR_POLICY_FLOW: make use of mbuf flow identifiers to place work, as well as allowing protocols to provide a flow generation function for mbufs without flow identifers (m2flow). Falls back on NETISR_POLICY_SOURCE if now flow ID is available. NETISR_POLICY_CPU: allow protocols to inspect and assign a CPU for each packet handled by netisr (m2cpuid). - Provide utility functions for querying the number of workstreams being used, as well as a mapping function from workstream to CPU ID, which protocols may use in work placement decisions. - Add explicit interfaces to get and set per-protocol queue limits, and get and clear drop counters, which query data or apply changes across all workstreams. - Add a more extensible netisr registration interface, in which protocols declare 'struct netisr_handler' structures for each registered NETISR_ type. These include name, handler function, optional mbuf to flow ID function, optional mbuf to CPU ID function, queue limit, and ordering policy. Padding is present to allow these to be expanded in the future. If no queue limit is declared, then a default is used. - Queue limits are now per-workstream, and raised from the previous IFQ_MAXLEN default of 50 to 256. - All protocols are updated to use the new registration interface, and with the exception of netnatm, default queue limits. Most protocols register as NETISR_POLICY_SOURCE, except IPv4 and IPv6, which use NETISR_POLICY_FLOW, and will therefore take advantage of driver- generated flow IDs if present. - Formalize a non-packet based interface between interface polling and the netisr, rather than having polling pretend to be two protocols. Provide two explicit hooks in the netisr worker for start and end events for runs: netisr_poll() and netisr_pollmore(), as well as a function, netisr_sched_poll(), to allow the polling code to schedule netisr execution. DEVICE_POLLING still embeds single-netisr assumptions in its implementation, so for now if it is compiled into the kernel, a single and un-bound netisr thread is enforced regardless of tunable configuration. In the default configuration, the new netisr implementation maintains the same basic assumptions as the previous implementation: a single, un-bound worker thread processes all deferred work, and direct dispatch is enabled by default wherever possible. Performance measurement shows a marginal performance improvement over the old implementation due to the use of batched dequeue. An rmlock is used to synchronize use and registration/unregistration using the framework; currently, synchronized use is disabled (replicating current netisr policy) due to a measurable 3%-6% hit in ping-pong micro-benchmarking. It will be enabled once further rmlock optimization has taken place. However, in practice, netisrs are rarely registered or unregistered at runtime. A new man page for netisr will follow, but since one doesn't currently exist, it hasn't been updated. This change is not appropriate for MFC, although the polling shutdown handler should be merged to 7-STABLE. Bump __FreeBSD_version. Reviewed by: bz
* Remove NETISR_MPSAFE, which allows specific netisr handlers to be directlyrwatson2008-07-041-1/+1
| | | | | | | | | | | | | | | | | | | | | | | dispatched without Giant, and add NETISR_FORCEQUEUE, which allows specific netisr handlers to always be dispatched via a queue (deferred). Mark the usb and if_ppp netisr handlers as NETISR_FORCEQUEUE, and explicitly acquire Giant in those handlers. Previously, any netisr handler not marked NETISR_MPSAFE would necessarily run deferred and with Giant acquired. This change removes Giant scaffolding from the netisr infrastructure, but NETISR_FORCEQUEUE allows non-MPSAFE handlers to continue to force deferred dispatch so as to avoid lock order reversals between their acqusition of Giant and any calling context. It is likely we will be able to remove NETISR_FORCEQUEUE once IFF_NEEDSGIANT is removed, as non-MPSAFE usb and if_ppp drivers will no longer be supported. Reviewed by: bz MFC after: 1 month X-MFC note: We can't remove NETISR_MPSAFE from stable/7 for KPI reasons, but the rest can go back.
* Factor out my copyrights + licenses from Charles D. Cranor andrwatson2007-01-081-2/+2
| | | | | | | | University of Washington copyrights, which include the advertising clause. Move $NetBSD$ into standard location for FreeBSD source files, and normalize formatting. MFC after: 3 days
* Use sparse initializers for "struct domain" and "struct protosw",ru2005-11-091-19/+25
| | | | so they are easier to follow for the human being.
* Forward declaring static variables as extern is invalid ISO-C. Now thatobrien2005-09-071-2/+2
| | | | GCC can properly handle forward static declarations, do this properly.
* Remove FreeBSD 2.2 protocol usrreq compatibility code.rwatson2005-07-191-26/+0
| | | | | | | | Remove minor #ifdefs for early NetBSD and OpenBSD compatibility. Remove spl-related definitions. MFC after: 2 weeks
* Lock down netnatm and mark as MPSAFE:rwatson2005-07-181-3/+2
| | | | | | | | | | | | | | | | | | | | | | - Introduce a subsystem mutex, natm_mtx, manipulated with accessor macros NATM_LOCK_INIT(), NATM_LOCK(), NATM_UNLOCK(), NATM_LOCK_ASSERT(). It protects the consistency of pcb-related data structures. Finer grained locking is possible, but should be done in the context of specific measurements (as very little work is done in netnatm -- most is in the ATM device driver or socket layer, so there's probably not much contention). - Remove GIANT_REQUIRED, mark as NETISR_MPSAFE, remove NET_NEEDS_GIANT("netnatm"). - Conditionally acquire Giant when entering network interfaces for ifp->if_ioctl() using IFF_LOCKGIANT(ifp)/IFF_UNLOCKGIANT(ifp) in order to coexist with non-MPSAFE atm ifnet drivers.. - De-spl. MFC after: 2 weeks Reviewed by: harti, bms (various versions)
* Mark netatm and netnatm explicitly as requiring Giant, as they still do.rwatson2005-02-171-0/+2
| | | | MFC after: 3 days
* /* -> /*- for license, minor formatting changesimp2005-01-071-1/+1
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* o add a flags parameter to netisr_register that is used to specifysam2003-11-081-1/+1
| | | | | | | | | | | | | | | | whether or not the isr needs to hold Giant when running; Giant-less operation is also controlled by the setting of debug_mpsafenet o mark all netisr's except NETISR_IP as needing Giant o add a GIANT_REQUIRED assertion to the top of netisr's that need Giant o pickup Giant (when debug_mpsafenet is 1) inside ip_input before calling up with a packet o change netisr handling so swi_net runs w/o Giant; instead we grab Giant before invoking handlers based on whether the handler needs Giant o change netisr handling so that netisr's that are marked MPSAFE may have multiple instances active at a time o add netisr statistics for packets dropped because the isr is inactive Supported by: FreeBSD Foundation
* Style(9): remove unneccesary space and blank lines, indentation,harti2003-08-061-13/+12
| | | | | | | function prototypes. Use LIST_FOREACH instead of explicit loops. The indentation of functions indendet by 4 space have been left alone. 2-space indented functions have been re-indented.
* Use __FBSDID().obrien2003-06-111-3/+3
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* Update netisr handling; Each SWI now registers its queue, and all queuejlemon2003-03-041-3/+3
| | | | | | | | | | drain routines are done by swi_net, which allows for better queue control at some future point. Packets may also be directly dispatched to a netisr instead of queued, this may be of interest at some installations, but currently defaults to off. Reviewed by: hsu, silby, jayanth, sam Sponsored by: DARPA, NAI Labs
* Be consistent about functions being static.phk2002-10-161-1/+1
| | | | Spotted by: FlexeLint.
* Change callers of mtx_init() to pass in an appropriate lock type name. Injhb2002-04-041-1/+1
| | | | | | | most cases NULL is passed, but in some cases such as network driver locks (which use the MTX_NETWORK_LOCK macro) and UMA zone locks, a name is used. Tested on: i386, alpha, sparc64
* Remove __P.alfred2002-03-201-1/+1
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* Initialise the intrq_present fields at runtime, not link time. This allowsmsmith2002-01-081-2/+1
| | | | | | us to load protocols at runtime, and avoids the use of common variables. Also fix the ip6_intrq assignment so that it works at all.
* Lock down the network interface queues. The queue mutex must be obtainedjlemon2000-11-251-0/+2
| | | | | | | | | | | | | | before adding/removing packets from the queue. Also, the if_obytes and if_omcasts fields should only be manipulated under protection of the mutex. IF_ENQUEUE, IF_PREPEND, and IF_DEQUEUE perform all necessary locking on the queue. An IF_LOCK macro is provided, as well as the old (mutex-less) versions of the macros in the form _IF_ENQUEUE, _IF_QFULL, for code which needs them, but their use is discouraged. Two new macros are introduced: IF_DRAIN() to drain a queue, and IF_HANDOFF, which takes care of locking/enqueue, and also statistics updating/start if necessary.
* Move the *intrq variables into net/intrq.c and unconditionallybrian2000-01-241-1/+4
| | | | | | | | | | | include this in all kernels. Declare some const *intrq_present variables that can be checked by a module prior to using *intrq to queue data. Make the if_tun module capable of processing atm, ip, ip6, ipx, natm and netatalk packets when TUNSIFHEAD is ioctl()d on. Review not required by: freebsd-hackers
* Staticize.eivind1998-02-091-3/+3
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* Removed unused #includes.bde1997-08-021-4/+0
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* import Chuck Cranor's ATM driverkjc1997-05-091-0/+131
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