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f8aee88f0b
freebsd/sys/netinet
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Alexander V. Chernikov f8aee88f0b 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
..
cc DCTCP (Data Center TCP) implementation. 2015-01-12 08:33:04 +00:00
khelp
libalias mdoc: fix rendering issues 2015-04-26 11:39:25 +00:00
accf_data.c
accf_dns.c
accf_http.c
cc.h DCTCP (Data Center TCP) implementation. 2015-01-12 08:33:04 +00:00
icmp6.h Implement Enhanced DAD algorithm for IPv6 described in 2015-03-02 17:30:26 +00:00
icmp_var.h
if_atm.c
if_atm.h
if_ether.c Remove LLE read lock from IPv4 fast path. 2015-12-05 09:50:37 +00:00
if_ether.h Decompose arp_ifinit() into arp_add_ifa_lle() and arp_announce_ifaddr(). 2015-11-09 10:35:33 +00:00
igmp_var.h - Rename 'struct igmp_ifinfo' into 'struct igmp_ifsoftc', since it really 2015-02-19 22:35:23 +00:00
igmp.c In the same way fix the problem described in r291578 for IGMPv3. 2015-12-01 11:24:30 +00:00
igmp.h
in_cksum.c
in_debug.c
in_gif.c Eliminate the use of m_copydata() in gif_encapcheck(). 2015-07-29 14:07:43 +00:00
in_kdtrace.c dd DTrace probe points, translators and a corresponding script 2015-09-13 15:50:55 +00:00
in_kdtrace.h dd DTrace probe points, translators and a corresponding script 2015-09-13 15:50:55 +00:00
in_mcast.c in_getmulti: Fix recursion on if_addr_lock on malloc failure 2015-11-18 23:53:13 +00:00
in_pcb.c The r241129 description was wrong that the scenario is possible 2015-11-25 14:45:43 +00:00
in_pcb.h Use Jenkins hash for TCP syncache. 2015-09-05 10:15:19 +00:00
in_pcbgroup.c Refactor / restructure the RSS code into generic, IPv4 and IPv6 specific 2015-01-18 18:06:40 +00:00
in_proto.c
in_rmx.c Remove in_setifarnh definition. 2015-11-30 06:02:35 +00:00
in_rss.c Rename rss_soft_m2cpuid() -> rss_soft_m2cpuid_v4() in preparation for 2015-08-29 06:58:30 +00:00
in_rss.h Rename rss_soft_m2cpuid() -> rss_soft_m2cpuid_v4() in preparation for 2015-08-29 06:58:30 +00:00
in_systm.h
in_var.h Replace the fastforward path with tryforward which does not require a 2015-11-05 07:26:32 +00:00
in.c Remove LLE read lock from IPv4 fast path. 2015-12-05 09:50:37 +00:00
in.h Provide functions to determine presence of a given address 2015-04-17 11:57:06 +00:00
ip6.h
ip_carp.c Revert r290403 2015-11-13 23:14:39 +00:00
ip_carp.h
ip_divert.c
ip_divert.h
ip_dummynet.h
ip_ecn.c
ip_ecn.h Remove unneded #include "opt_inet.h". 2015-07-31 09:02:28 +00:00
ip_encap.c Fix possible use after free in encap[46]_input(). 2015-06-18 18:28:38 +00:00
ip_encap.h
ip_fastfwd.c Replace the fastforward path with tryforward which does not require a 2015-11-05 07:26:32 +00:00
ip_fw.h Implement ipfw internal olist command to list named objects. 2015-11-03 10:21:53 +00:00
ip_gre.c o Use new function ip_fillid() in all places throughout the kernel, 2015-04-01 22:26:39 +00:00
ip_icmp.c Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. 2015-07-29 08:12:05 +00:00
ip_icmp.h
ip_id.c Provide a comment explaining issues with the counter(9) trick, so that 2015-04-02 14:22:59 +00:00
ip_input.c Overhaul if_enc(4) and make it loadable in run-time. 2015-11-25 07:31:59 +00:00
ip_ipsec.c Set the proper direction to check for policies in this one case. 2015-10-29 21:26:32 +00:00
ip_ipsec.h
ip_mroute.c CALLOUT_MPSAFE has lost its meaning since r141428, i.e., for more than ten 2015-05-22 17:05:21 +00:00
ip_mroute.h
ip_options.c
ip_options.h
ip_output.c Simplify ip[6] simploop: 2015-08-08 15:58:35 +00:00
ip_reass.c Fix RSS build - netisr input / NETISR_IP_DIRECT is used here. 2015-04-15 00:57:21 +00:00
ip_var.h fix a typo in a comment 2015-07-18 15:28:32 +00:00
ip.h Since the IETF has redefined the meaning of the tos field to accommodate 2015-07-18 06:48:30 +00:00
pim_var.h
pim.h
raw_ip.c Convert in_ifaddr_lock and in6_ifaddr_lock to rmlock. 2015-07-29 08:12:05 +00:00
sctp_asconf.c Provide consistent error causes whenever an ABORT chunk is sent. 2015-07-27 22:35:54 +00:00
sctp_asconf.h
sctp_auth.c Use __func__ instead of __FUNCTION__. 2015-10-19 11:17:54 +00:00
sctp_auth.h
sctp_bsd_addr.c
sctp_bsd_addr.h
sctp_cc_functions.c Fix and cleanup the debug information. This has no user-visible changes. 2015-05-28 16:00:23 +00:00
sctp_constants.h Ensure that ERROR chunks are always padded by implementing this 2015-09-11 13:54:33 +00:00
sctp_crc32.c
sctp_crc32.h
sctp_dtrace_declare.h
sctp_dtrace_define.h
sctp_header.h Cleanup the handling of error causes for ERROR chunks. This fixes 2015-09-12 17:08:51 +00:00
sctp_indata.c Ensure that outgoing streams get reset when they run dry. 2015-12-03 15:19:29 +00:00
sctp_indata.h Don't take the port numbers for packets containing ABORT chunks from 2015-08-02 16:07:30 +00:00
sctp_input.c Fix a bug where a stream reset request wasn't retranmitted when the 2015-12-04 08:49:27 +00:00
sctp_input.h Add FIB support for SCTP. 2015-06-17 15:20:14 +00:00
sctp_lock_bsd.h
sctp_os_bsd.h Move including netinet/icmp6.h around to avoid a problem when including 2015-07-25 18:26:09 +00:00
sctp_os.h
sctp_output.c Ensure that outgoing streams get reset when they run dry. 2015-12-03 15:19:29 +00:00
sctp_output.h Fix an issue with MAC OS locking and also optimize the case 2015-07-24 14:09:03 +00:00
sctp_pcb.c Fix the handling of IPSec policies in the SCTP stack. At least 2015-11-21 18:21:16 +00:00
sctp_pcb.h Add FIB support for SCTP. 2015-06-17 15:20:14 +00:00
sctp_peeloff.c Add a SCTP socket option to limit the cwnd for each path. 2015-03-10 19:49:25 +00:00
sctp_peeloff.h
sctp_ss_functions.c
sctp_structs.h Fix several problems with Stream Reset. 2015-07-22 11:30:37 +00:00
sctp_syscalls.c Fix two KTRACE related bugs. 2015-06-19 21:55:12 +00:00
sctp_sysctl.c Fix the exporting of SCTP association states to userland. Without this, 2015-08-29 09:14:32 +00:00
sctp_sysctl.h Remove redundant 'man page' 2015-09-15 21:16:45 +00:00
sctp_timer.c Ensure that outgoing streams get reset when they run dry. 2015-12-03 15:19:29 +00:00
sctp_timer.h
sctp_uio.h The field sinfo_timetolive should have been sinfo_pr_value. 2015-11-06 14:00:26 +00:00
sctp_usrreq.c When the sending of an SCTP outgoing stream reset request fails, 2015-11-26 23:12:41 +00:00
sctp_var.h Stop the heartbeat timer when removing a net. 2015-06-14 17:48:44 +00:00
sctp.h Cleanup the handling of error causes for ERROR chunks. This fixes 2015-09-12 17:08:51 +00:00
sctputil.c When receiving an SCTP/UDP packet and the interface performed 2015-11-26 09:25:20 +00:00
sctputil.h Fix the exporting of SCTP association states to userland. Without this, 2015-08-29 09:14:32 +00:00
siftr.c Move the SIFTR DTrace probe out of the writing thread context 2015-04-30 17:43:40 +00:00
tcp_debug.c
tcp_debug.h
tcp_fsm.h
tcp_hostcache.c CALLOUT_MPSAFE has lost its meaning since r141428, i.e., for more than ten 2015-05-22 17:05:21 +00:00
tcp_hostcache.h
tcp_input.c Improve the sysctl node name. 2015-11-05 02:09:48 +00:00
tcp_lro.c Fix leak in tcp_lro_rx. Simply clearing M_PKTHDR isn't enough, any tags 2015-06-30 17:19:58 +00:00
tcp_lro.h
tcp_offload.c
tcp_offload.h
tcp_output.c There are times when it would be really nice to have a record of the last few 2015-10-14 00:35:37 +00:00
tcp_pcap.c Hopefully also unbreak VIMAGE kernels replacing the &V_... with 2015-10-15 01:44:32 +00:00
tcp_pcap.h There are times when it would be really nice to have a record of the last few 2015-10-14 00:35:37 +00:00
tcp_reass.c Eliminate nd6_nud_hint() and its TCP bindings. 2015-09-27 05:29:34 +00:00
tcp_sack.c Calculate the correct amount of bytes that are in-flight for a connection as 2015-10-28 22:57:51 +00:00
tcp_seq.h
tcp_subr.c Turning on IPSEC used to introduce a slight amount of performance 2015-10-27 00:42:15 +00:00
tcp_syncache.c Use Jenkins hash for TCP syncache. 2015-09-05 10:15:19 +00:00
tcp_syncache.h Use Jenkins hash for TCP syncache. 2015-09-05 10:15:19 +00:00
tcp_timer.c This fixes several places where callout_stops return is examined. The 2015-11-13 22:51:35 +00:00
tcp_timer.h Put r284245 back in place: If at first this fix was seen as a temporary 2015-08-30 13:44:39 +00:00
tcp_timewait.c Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability: 2015-08-03 12:13:54 +00:00
tcp_usrreq.c There are times when it would be really nice to have a record of the last few 2015-10-14 00:35:37 +00:00
tcp_var.h Calculate the correct amount of bytes that are in-flight for a connection as 2015-10-28 22:57:51 +00:00
tcp.h There are times when it would be really nice to have a record of the last few 2015-10-14 00:35:37 +00:00
tcpip.h
toecore.c Replace toe_nd6_resolve() with nd6_resolve(). 2015-09-22 19:05:44 +00:00
toecore.h
udp_usrreq.c get_inpcbinfo() and get_pcblist() are UDP local functions and 2015-08-27 15:27:41 +00:00
udp_var.h get_inpcbinfo() and get_pcblist() are UDP local functions and 2015-08-27 15:27:41 +00:00
udp.h
udplite.h