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* ipv4: consider TOS in fib_select_defaultJulian Anastasov2015-07-241-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | fib_select_default considers alternative routes only when res->fi is for the first alias in res->fa_head. In the common case this can happen only when the initial lookup matches the first alias with highest TOS value. This prevents the alternative routes to require specific TOS. This patch solves the problem as follows: - routes that require specific TOS should be returned by fib_select_default only when TOS matches, as already done in fib_table_lookup. This rule implies that depending on the TOS we can have many different lists of alternative gateways and we have to keep the last used gateway (fa_default) in first alias for the TOS instead of using single tb_default value. - as the aliases are ordered by many keys (TOS desc, fib_priority asc), we restrict the possible results to routes with matching TOS and lowest metric (fib_priority) and routes that match any TOS, again with lowest metric. For example, packet with TOS 8 can not use gw3 (not lowest metric), gw4 (different TOS) and gw6 (not lowest metric), all other gateways can be used: tos 8 via gw1 metric 2 <--- res->fa_head and res->fi tos 8 via gw2 metric 2 tos 8 via gw3 metric 3 tos 4 via gw4 tos 0 via gw5 tos 0 via gw6 metric 1 Reported-by: Hagen Paul Pfeifer <hagen@jauu.net> Signed-off-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: David S. Miller <davem@davemloft.net>
* ipv4: FIB Local/MAIN table collapseAlexander Duyck2015-03-111-0/+1
| | | | | | | | | | | | | | | | | | | | | | This patch is meant to collapse local and main into one by converting tb_data from an array to a pointer. Doing this allows us to point the local table into the main while maintaining the same variables in the table. As such the tb_data was converted from an array to a pointer, and a new array called data is added in order to still provide an object for tb_data to point to. In order to track the origin of the fib aliases a tb_id value was added in a hole that existed on 64b systems. Using this we can also reverse the merge in the event that custom FIB rules are enabled. With this patch I am seeing an improvement of 20ns to 30ns for routing lookups as long as custom rules are not enabled, with custom rules enabled we fall back to split tables and the original behavior. Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* fib_trie: Add slen to fib aliasAlexander Duyck2015-02-271-0/+1
| | | | | | | | | | | | Make use of an empty spot in the alias to store the suffix length so that we don't need to pull that information from the leaf_info structure. This patch also makes a slight change to the user statistics. Instead of incrementing semantic_match_miss once per leaf_info miss we now just increment it once per leaf if a match was not found. Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* fib_trie: Convert fib_alias to hlist from listAlexander Duyck2015-02-271-1/+1
| | | | | | | | | There isn't any advantage to having it as a list and by making it an hlist we make the fib_alias more compatible with the list_info in terms of the type of list used. Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* fib_trie: Move fib_find_alias to file where it is usedAlexander Duyck2015-01-251-1/+0
| | | | | | | | | | The function fib_find_alias is only accessed by functions in fib_trie.c as such it makes sense to relocate it and cast it as static so that the compiler can take advantage of optimizations it can do to it as a local function. Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* ipv4: make fib_detect_death staticStephen Hemminger2013-12-281-2/+0
| | | | | | | Make fib_detect_death function static only used in one file. Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: ipv4/ipv6: Remove extern from function prototypesJoe Perches2013-10-191-15/+11
| | | | | | | | | | | | | There are a mix of function prototypes with and without extern in the kernel sources. Standardize on not using extern for function prototypes. Function prototypes don't need to be written with extern. extern is assumed by the compiler. Its use is as unnecessary as using auto to declare automatic/local variables in a block. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* fib: Use const struct nl_info * in rtmsg_fibJoe Perches2013-10-181-1/+1
| | | | | | | | The rtmsg_fib function doesn't modify this argument so mark it const. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* ipv4: Fix nexthop caching wrt. scoping.David S. Miller2011-03-241-2/+1
| | | | | | | | | Move the scope value out of the fib alias entries and into fib_info, so that we always use the correct scope when recomputing the nexthop cached source address. Reported-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: David S. Miller <davem@davemloft.net>
* ipv4: Kill fib_semantic_match declaration from fib_lookup.hDavid S. Miller2011-03-121-3/+0
| | | | | | This function no longer exists. Signed-off-by: David S. Miller <davem@davemloft.net>
* ipv4: Inline fib_semantic_match into check_leafDavid S. Miller2011-03-071-0/+7
| | | | | | | This elimiates a lot of pure overhead due to parameter passing. Signed-off-by: David S. Miller <davem@davemloft.net>
* ipv4: Remember FIB alias list head and table in lookup results.David S. Miller2011-01-311-1/+1
| | | | | | | | | This will be used later to implement fib_select_default() in a completely generic manner, instead of the current situation where the default route is re-looked up in the TRIE/HASH table and then the available aliases are analyzed. Signed-off-by: David S. Miller <davem@davemloft.net>
* fib: fib_result_assign() should not change fib refcountsEric Dumazet2010-11-041-4/+1
| | | | | | | | | | | | After commit ebc0ffae5 (RCU conversion of fib_lookup()), fib_result_assign() should not change fib refcounts anymore. Thanks to Michael who did the bisection and bug report. Reported-by: Michael Ellerman <michael@ellerman.id.au> Tested-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* fib: introduce fib_alias_accessed() helperEric Dumazet2010-10-211-0/+7
| | | | | | | | | Perf tools session at NFWS 2010 pointed out a false sharing on struct fib_alias that can be avoided pretty easily, if we set FA_S_ACCESSED bit only if needed (ie : not already set) Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* fib_hash: RCU conversion phase 2Eric Dumazet2010-10-171-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Get rid of fib_hash_lock rwlock. The fn_zone hash table resize is the noticeable part of this patch. I added a seqlock per fn_zone, so that readers can restart their lookup in the (very rare) case a writer expanded the hash table. Add rcu heads in fib_alias and fib_node, use call_rcu() to defer their freeing, and use appropriate _rcu list manipulations. Stress test (160.000.000 udp frames sent, IP route cache disabled to mimic DDOS attack, FIB_HASH) Before: real 0m41.191s user 0m13.137s sys 8m55.241s After: real 0m38.091s user 0m13.189s sys 7m53.018s Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* fib: RCU conversion of fib_lookup()Eric Dumazet2010-10-051-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | fib_lookup() converted to be called in RCU protected context, no reference taken and released on a contended cache line (fib_clntref) fib_table_lookup() and fib_semantic_match() get an additional parameter. struct fib_info gets an rcu_head field, and is freed after an rcu grace period. Stress test : (Sending 160.000.000 UDP frames on same neighbour, IP route cache disabled, dual E5540 @2.53GHz, 32bit kernel, FIB_HASH) (about same results for FIB_TRIE) Before patch : real 1m31.199s user 0m13.761s sys 23m24.780s After patch: real 1m5.375s user 0m14.997s sys 15m50.115s Before patch Profile : 13044.00 15.4% __ip_route_output_key vmlinux 8438.00 10.0% dst_destroy vmlinux 5983.00 7.1% fib_semantic_match vmlinux 5410.00 6.4% fib_rules_lookup vmlinux 4803.00 5.7% neigh_lookup vmlinux 4420.00 5.2% _raw_spin_lock vmlinux 3883.00 4.6% rt_set_nexthop vmlinux 3261.00 3.9% _raw_read_lock vmlinux 2794.00 3.3% fib_table_lookup vmlinux 2374.00 2.8% neigh_resolve_output vmlinux 2153.00 2.5% dst_alloc vmlinux 1502.00 1.8% _raw_read_lock_bh vmlinux 1484.00 1.8% kmem_cache_alloc vmlinux 1407.00 1.7% eth_header vmlinux 1406.00 1.7% ipv4_dst_destroy vmlinux 1298.00 1.5% __copy_from_user_ll vmlinux 1174.00 1.4% dev_queue_xmit vmlinux 1000.00 1.2% ip_output vmlinux After patch Profile : 13712.00 15.8% dst_destroy vmlinux 8548.00 9.9% __ip_route_output_key vmlinux 7017.00 8.1% neigh_lookup vmlinux 4554.00 5.3% fib_semantic_match vmlinux 4067.00 4.7% _raw_read_lock vmlinux 3491.00 4.0% dst_alloc vmlinux 3186.00 3.7% neigh_resolve_output vmlinux 3103.00 3.6% fib_table_lookup vmlinux 2098.00 2.4% _raw_read_lock_bh vmlinux 2081.00 2.4% kmem_cache_alloc vmlinux 2013.00 2.3% _raw_spin_lock vmlinux 1763.00 2.0% __copy_from_user_ll vmlinux 1763.00 2.0% ip_output vmlinux 1761.00 2.0% ipv4_dst_destroy vmlinux 1631.00 1.9% eth_header vmlinux 1440.00 1.7% _raw_read_unlock_bh vmlinux Reference results, if IP route cache is enabled : real 0m29.718s user 0m10.845s sys 7m37.341s 25213.00 29.5% __ip_route_output_key vmlinux 9011.00 10.5% dst_release vmlinux 4817.00 5.6% ip_push_pending_frames vmlinux 4232.00 5.0% ip_finish_output vmlinux 3940.00 4.6% udp_sendmsg vmlinux 3730.00 4.4% __copy_from_user_ll vmlinux 3716.00 4.4% ip_route_output_flow vmlinux 2451.00 2.9% __xfrm_lookup vmlinux 2221.00 2.6% ip_append_data vmlinux 1718.00 2.0% _raw_spin_lock_bh vmlinux 1655.00 1.9% __alloc_skb vmlinux 1572.00 1.8% sock_wfree vmlinux 1345.00 1.6% kfree vmlinux Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* ipv4: cleanup - remove two unused parameters from fib_semantic_match().Rami Rosen2009-05-181-2/+1
| | | | | Signed-off-by: Rami Rosen <ramirose@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [IPV4] FIB_HASH: Reduce memory needs and speedup lookupsEric Dumazet2008-01-281-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | Currently, sizeof(struct fib_alias) is 24 or 48 bytes on 32/64 bits arches. Because of SLAB_HWCACHE_ALIGN requirement, these are rounded to 32 and 64 bytes respectively. This patch moves rcu to the end of fib_alias, and conditionally defines it only for CONFIG_IP_FIB_TRIE. We also remove SLAB_HWCACHE_ALIGN requirement for fib_alias and fib_node objects because it is not necessary. (BTW SLUB currently denies it for objects smaller than cache_line_size() / 2, but not SLAB) Finally, sizeof(fib_alias) go back to 16 and 32 bytes. Then, we can embed one fib_alias on each fib_node, to favor locality. Most of the time access to the fib_alias will be free because one cache line contains both the list head (fn_alias) and (one of) the list element. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [IPV4]: Unify assignment of fi to fib_resultDenis V. Lunev2008-01-281-0/+10
| | | | | | Signed-off-by: Denis V. Lunev <den@openvz.org> Acked-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> Signed-off-by: David S. Miller <davem@davemloft.net>
* [IPV4]: no need pass pointer to a default into fib_detect_deathDenis V. Lunev2008-01-281-1/+1
| | | | | | | | ipv4: no need pass pointer to a default into fib_detect_death Signed-off-by: Denis V. Lunev <den@openvz.org> Acked-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> Signed-off-by: David S. Miller <davem@davemloft.net>
* [RTNETLINK]: Fix sending netlink message when replace route.Milan Kocian2007-05-241-1/+2
| | | | | | | | | | | | When you replace route via ip r r command the netlink multicast message is not send. This patch corrects it. NL message is sent with NLM_F_REPLACE flag. Addresses http://bugzilla.kernel.org/show_bug.cgi?id=8320 Signed-off-by: Milan Kocian <milon@wq.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* [IPV4]: net/ipv4/fib annotationsAl Viro2006-09-281-2/+2
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
* [IPV4]: fib_semantic_match() annotationsAl Viro2006-09-281-1/+1
| | | | | | | 'mask' and 'zone' arguments are net-endian Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
* [IPv4]: Convert FIB dumping to use new netlink apiThomas Graf2006-09-221-1/+1
| | | | | Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
* [IPv4]: FIB configuration using struct fib_configThomas Graf2006-09-221-8/+3
| | | | | | | | | | | | | | | Introduces struct fib_config replacing the ugly struct kern_rta prone to ordering issues. Avoids creating faked netlink messages for auto generated routes or requests via ioctl. A new interface net/nexthop.h is added to help navigate through nexthop configuration arrays. A new struct nl_info will be used to carry the necessary netlink information to be used for notifications later on. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
* [NET]: Use u32 for routing table IDsPatrick McHardy2006-09-221-2/+2
| | | | | | | | | | Use u32 for routing table IDs in net/ipv4 and net/decnet in preparation of support for a larger number of routing tables. net/ipv6 already uses u32 everywhere and needs no further changes. No functional changes are made by this patch. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* [IPV4]: Prepare FIB core for RCU.Robert Olsson2005-08-291-0/+1
| | | | | | | | | * RCU versions of hlist_***_rcu * fib_alias partial rcu port just whats needed now. Signed-off-by: Robert Olsson <Robert.Olsson@data.slu.se> Signed-off-by: Stephen Hemminger <shemminger@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* [NETLINK]: Correctly set NLM_F_MULTI without checking the pidJamal Hadi Salim2005-06-181-1/+2
| | | | | | | | | | | This patch rectifies some rtnetlink message builders that derive the flags from the pid. It is now explicit like the other cases which get it right. Also fixes half a dozen dumpers which did not set NLM_F_MULTI at all. Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca> Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
* Linux-2.6.12-rc2v2.6.12-rc2Linus Torvalds2005-04-161-0/+43
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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