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freebsd-skq/sys/net
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melifaro 67195f5ef1 Remove LLE read lock from IPv4 fast path. 
LLE structure is mostly unchanged during its lifecycle.
To be more specific, there are 2 things relevant for fast path
  lookup code:
1) link-level address change. Since r286722, these updates are performed
  under AFDATA WLOCK.
2) Some sort of feedback indicating that this particular entry is used so
  we re-send arp request to perform reachability verification instead of
  expiring entry. The only signal that is needed from fast path is something
  like binary yes/no.

The latter is solved by the following changes:
1) introduce special r_skip_req field which is read lockless by fast path,
  but updated under (new) req_mutex mutex. If this field is non-zero, then
  fast path will acquire lock and set it back to 0.
2) introduce simple state machine: incomplete->reachable<->verify->deleted.
  Before that we implicitely had incomplete->reachable->deleted state machine,
  with V_arpt_keep between "reachable" and "deleted". Verification was performed
  in runtime 5 seconds before V_arpt_keep expire.
  This is changed to "change state to verify 5 seconds before V_arpt_keep,
  set r_skip_req to non-zero value and check it every second". If the value
  is zero - then send arp verification probe.
These changes do not introduce any signifficant control plane overhead:
  typically lle callout timer would fire 1 time more each V_arpt_keep (1200s)
  for used lles and up to arp_maxtries (5) for dead lles.

As a result, all packets towards "reachable" lle are handled by fast path without
acquiring lle read lock.

Additional "req_mutex" is needed because callout / arpresolve_slow() or eventhandler
  might keep LLE lock for signifficant amount of time, which might not be feasible
  for fast path locking (e.g. having rmlock as ether AFDATA or lltable own lock).

Differential Revision:	https://reviews.freebsd.org/D3688
2015-12-05 09:50:37 +00:00
..
altq Fix the spelling of eri's name. 2015-08-24 23:40:36 +00:00
bpf_buffer.c Remove the sleep from the buffer allocation routine. 2015-07-31 20:25:54 +00:00
bpf_buffer.h
bpf_filter.c Include strings.h so that bpf_filter.c can be built in userland. 2014-03-19 13:10:25 +00:00
bpf_jitter.c
bpf_jitter.h
bpf_zerocopy.c - Modify vm_page_unwire() and vm_page_enqueue() to directly accept 2014-06-16 18:15:27 +00:00
bpf_zerocopy.h
bpf.c Remove the mtx_sleep() from the kqueue f_event filter. 2015-08-03 22:14:45 +00:00
bpf.h Remove two unnecessary sleeps from the hot path in bpf(4). 2015-07-31 21:43:27 +00:00
bpfdesc.h
bridgestp.c
bridgestp.h
ethernet.h Move struct ether_vlan_header to ethernet.h, out of if_vlan_var.h, 2014-11-11 10:22:33 +00:00
fddi.h
firewire.h
flowtable.c Fix three flowtable bugs, a) one lookup issue, b) a two cleaner issue. 2015-11-02 21:21:00 +00:00
flowtable.h Add my copyright to flowtable. 2014-02-17 12:07:17 +00:00
ieee8023ad_lacp.c Add sysctl to control LACP strict compliance default 2015-11-06 15:33:27 +00:00
ieee8023ad_lacp.h Make LAG LACP fast timeout tunable through IOCTL. 2015-08-12 20:21:04 +00:00
ieee_oui.h Bump bhyve allocation up to 20 bits to avoid 2014-05-20 02:59:13 +00:00
if_arc.h
if_arcsubr.c Replace the fastforward path with tryforward which does not require a 2015-11-05 07:26:32 +00:00
if_arp.h Remove struct arpcom. It is unused by most interface types, that allocate 2014-11-07 15:14:10 +00:00
if_atm.h
if_atmsubr.c Mechanically convert to if_inc_counter(). 2014-09-19 10:39:58 +00:00
if_bridge.c Fix panic when adding vtnet interfaces to a bridge 2015-06-13 19:39:21 +00:00
if_bridgevar.h
if_clone.c Fix group membership of cloned interfaces when one is moved by 2015-03-02 20:00:03 +00:00
if_clone.h Fix group membership of cloned interfaces when one is moved by 2015-03-02 20:00:03 +00:00
if_dead.c Provide a dead version of if_get_counter. 2014-12-12 16:10:42 +00:00
if_debug.c Remove ifq_drops from struct ifqueue. Now queue drops are accounted in 2014-09-19 09:01:19 +00:00
if_disc.c Make checks for rt_mtu generic: 2014-11-06 13:13:09 +00:00
if_dl.h Constantify lookup key in ifa_ifwith* functions. 2015-09-05 05:33:20 +00:00
if_edsc.c Virtualize if_edsc(4). 2014-10-05 21:27:26 +00:00
if_enc.c Fix building sys/modules/if_enc by adding missing headers 2015-11-25 21:16:10 +00:00
if_enc.h Overhaul if_enc(4) and make it loadable in run-time. 2015-11-25 07:31:59 +00:00
if_epair.c Fix a panic which was reproducible by an infinite loop of 2015-09-02 16:30:45 +00:00
if_ethersubr.c Replace the fastforward path with tryforward which does not require a 2015-11-05 07:26:32 +00:00
if_fddisubr.c Replace the fastforward path with tryforward which does not require a 2015-11-05 07:26:32 +00:00
if_fwsubr.c Replace the fastforward path with tryforward which does not require a 2015-11-05 07:26:32 +00:00
if_gif.c Add IFCAP_LINKSTATE support. 2015-10-03 09:15:23 +00:00
if_gif.h - Remove GIF_{SEND,ACCEPT}_REVETHIP. 2015-09-10 05:59:39 +00:00
if_gre.c Check the size of data available in mbuf, before using them. 2015-10-28 17:55:37 +00:00
if_gre.h Extern declarations in C files loses compile-time checking that 2014-12-25 21:32:37 +00:00
if_iso88025subr.c Replace the fastforward path with tryforward which does not require a 2015-11-05 07:26:32 +00:00
if_lagg.c Move iflladdr_event eventhandler invocation to if_setlladdr. 2015-11-14 13:34:03 +00:00
if_lagg.h Fix lladdr change propagation for on vlans on top of it. 2015-11-01 19:59:04 +00:00
if_llatbl.c Remove LLE read lock from IPv4 fast path. 2015-12-05 09:50:37 +00:00
if_llatbl.h Remove LLE read lock from IPv4 fast path. 2015-12-05 09:50:37 +00:00
if_llc.h
if_loop.c Fix if_loop so bpfwrite() can use it regardless of the state of 2015-07-06 02:12:49 +00:00
if_me.c Add IFCAP_LINKSTATE support. 2015-10-03 09:15:23 +00:00
if_media.c Make IFMEDIA_DEBUG a kernel option. 2015-04-21 10:35:23 +00:00
if_media.h ifmedia changes: 2015-04-07 21:31:17 +00:00
if_mib.c Remove SYSCTL_VNET_* macros, and simply put CTLFLAG_VNET where needed. 2014-11-07 09:39:05 +00:00
if_mib.h
if_pflog.h
if_pfsync.h Remove more constants related to static sysctl nodes. The MAXID constants 2014-02-25 18:44:33 +00:00
if_sppp.h
if_spppfr.c Mechanically convert to if_inc_counter(). 2014-09-19 10:39:58 +00:00
if_spppsubr.c Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. 2015-07-29 08:12:05 +00:00
if_stf.c Ansify if_stf.c 2015-07-31 09:04:22 +00:00
if_tap.c if_tap: correct typo in sysctl description (Enably) 2015-10-21 19:56:16 +00:00
if_tap.h
if_tapvar.h
if_tun.c * Address review (and add a bit myself). 2015-07-12 18:14:38 +00:00
if_tun.h
if_types.h After r281643 an #ifdef IFT_FOO preprocessor directive returns false, 2015-05-02 20:37:40 +00:00
if_var.h Overhaul if_enc(4) and make it loadable in run-time. 2015-11-25 07:31:59 +00:00
if_vlan_var.h Move struct ether_vlan_header to ethernet.h, out of if_vlan_var.h, 2014-11-11 10:22:33 +00:00
if_vlan.c Move iflladdr_event eventhandler invocation to if_setlladdr. 2015-11-14 13:34:03 +00:00
if_vxlan.c Start process of removing the use of the deprecated "M_FLOWID" flag 2014-12-01 11:45:24 +00:00
if_vxlan.h Add vxlan interface 2014-10-20 14:42:42 +00:00
if.c Overhaul if_enc(4) and make it loadable in run-time. 2015-11-25 07:31:59 +00:00
if.h * Add SIOCGI2C driver ioctl used to retrieve i2c info. 2014-08-29 18:02:58 +00:00
ifq.h Move ALTQ from contrib to net/altq. The ALTQ code is for many years 2015-04-16 20:22:40 +00:00
iso88025.h Garbage collect long time obsoleted (or never used) stuff from routing API. 2014-03-15 06:49:32 +00:00
netisr_internal.h
netisr.c Currently there is no easy way to specify net.isr.maxthreads = all cpus. We need 2015-04-25 16:12:06 +00:00
netisr.h Update the IPv4 input path to handle reassembled frames and incoming frames 2014-09-09 04:18:20 +00:00
netmap_user.h Sync netmap sources with the version in our private tree. 2015-07-10 05:51:36 +00:00
netmap.h Sync netmap sources with the version in our private tree. 2015-07-10 05:51:36 +00:00
paravirt.h Update to the current version of netmap. 2014-08-16 15:00:01 +00:00
pfil.c
pfil.h
pfkeyv2.h Implement the sadb_x_policy_priority field as it is done in Linux: 2015-11-17 14:39:33 +00:00
pfvar.h pf: Fix compliation warning with gcc 2015-10-25 18:09:03 +00:00
ppp_defs.h
radix_mpath.c - Remove rt_metrics_lite and simply put its members into rtentry. 2014-03-05 01:17:47 +00:00
radix_mpath.h
radix.c Follow r256586 and rename the kernel version of the Free() macro to 2015-07-30 02:09:03 +00:00
radix.h Follow r256586 and rename the kernel version of the Free() macro to 2015-07-30 02:09:03 +00:00
raw_cb.c
raw_cb.h
raw_usrreq.c
route.c Move RTF_PINNED handling to generic route code. 2015-12-02 08:17:31 +00:00
route.h Add new rt_foreach_fib_walk_del() function for deleting route entries 2015-11-30 05:51:14 +00:00
rss_config.c Remove now unused (and #if 0'ed out) headers. 2015-08-29 04:33:31 +00:00
rss_config.h Replace the printf()s with optional rate limited debugging for RSS. 2015-08-28 05:58:16 +00:00
rtsock.c Remove ifq_drops from struct ifqueue. Now queue drops are accounted in 2014-09-19 09:01:19 +00:00
sff8436.h * Update SFF-8024 Identifier constants. 2015-05-16 13:11:35 +00:00
sff8472.h * Update SFF-8024 Identifier constants. 2015-05-16 13:11:35 +00:00
slcompress.c
slcompress.h
toeplitz.c Refactor / restructure the RSS code into generic, IPv4 and IPv6 specific 2015-01-18 18:06:40 +00:00
toeplitz.h Refactor / restructure the RSS code into generic, IPv4 and IPv6 specific 2015-01-18 18:06:40 +00:00
vnet.c
vnet.h Remove SYSCTL_VNET_* macros, and simply put CTLFLAG_VNET where needed. 2014-11-07 09:39:05 +00:00