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2010-10-16tipc: cleanup function namespacestephen hemminger
Do some cleanups of TIPC based on make namespacecheck 1. Don't export unused symbols 2. Eliminate dead code 3. Make functions and variables local 4. Rename buf_acquire to tipc_buf_acquire since it is used in several files Compile tested only. This make break out of tree kernel modules that depend on TIPC routines. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Acked-by: Jon Maloy <jon.maloy@ericsson.com> Acked-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-16fib: avoid false sharing on fib_table_hashEric Dumazet
While doing profile analysis, I found fib_hash_table was sometime in a cache line shared by a possibly often written kernel structure. (CONFIG_IP_ROUTE_MULTIPATH || !CONFIG_IPV6_MULTIPLE_TABLES) It's hard to detect because not easily reproductible. Make sure we allocate a full cache line to keep this shared in all cpus caches. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-16fib_trie: use fls() instead of open coded loopEric Dumazet
fib_table_lookup() might use fls() to speedup an open coded loop. Noticed while doing a profile analysis. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-16fib: remove a useless synchronize_rcu() callEric Dumazet
fib_nl_delrule() calls synchronize_rcu() for no apparent reason, while rtnl is held. I suspect it was done to avoid an atomic_inc_not_zero() in fib_rules_lookup(), which commit 7fa7cb7109d07 added anyway. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-16fib6: use FIB_LOOKUP_NOREF in fib6_rule_lookup()Eric Dumazet
Avoid two atomic ops on found rule in fib6_rule_lookup() Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-16net: allocate skbs on local nodeEric Dumazet
commit b30973f877 (node-aware skb allocation) spread a wrong habit of allocating net drivers skbs on a given memory node : The one closest to the NIC hardware. This is wrong because as soon as we try to scale network stack, we need to use many cpus to handle traffic and hit slub/slab management on cross-node allocations/frees when these cpus have to alloc/free skbs bound to a central node. skb allocated in RX path are ephemeral, they have a very short lifetime : Extra cost to maintain NUMA affinity is too expensive. What appeared as a nice idea four years ago is in fact a bad one. In 2010, NIC hardwares are multiqueue, or we use RPS to spread the load, and two 10Gb NIC might deliver more than 28 million packets per second, needing all the available cpus. Cost of cross-node handling in network and vm stacks outperforms the small benefit hardware had when doing its DMA transfert in its 'local' memory node at RX time. Even trying to differentiate the two allocations done for one skb (the sk_buff on local node, the data part on NIC hardware node) is not enough to bring good performance. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-13Phonet: 'connect' socket implementation for Pipe controllerKumar Sanghvi
Based on suggestion by Rémi Denis-Courmont to implement 'connect' for Pipe controller logic, this patch implements 'connect' socket call for the Pipe controller logic. The patch does following:- - Removes setsockopts for PNPIPE_CREATE and PNPIPE_DESTROY - Adds setsockopt for setting the Pipe handle value - Implements connect socket call - Updates the Pipe controller logic User-space should now follow below sequence with Pipe controller:- -socket -bind -setsockopt for PNPIPE_PIPE_HANDLE -connect -setsockopt for PNPIPE_ENCAP_IP -setsockopt for PNPIPE_ENABLE GPRS/3G data has been tested working fine with this. Signed-off-by: Kumar Sanghvi <kumar.sanghvi@stericsson.com> Acked-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-13tipc: clean out all instances of #if 0'd unused codePaul Gortmaker
Remove all instances of legacy, or as yet to be implemented code that is currently living within an #if 0 ... #endif block. In the rare instance that some of it be needed in the future, it can still be dragged out of history, but there is no need for it to sit in mainline. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-12net: percpu net_device refcountEric Dumazet
We tried very hard to remove all possible dev_hold()/dev_put() pairs in network stack, using RCU conversions. There is still an unavoidable device refcount change for every dst we create/destroy, and this can slow down some workloads (routers or some app servers, mmap af_packet) We can switch to a percpu refcount implementation, now dynamic per_cpu infrastructure is mature. On a 64 cpus machine, this consumes 256 bytes per device. On x86, dev_hold(dev) code : before lock incl 0x280(%ebx) after: movl 0x260(%ebx),%eax incl fs:(%eax) Stress bench : (Sending 160.000.000 UDP frames, IP route cache disabled, dual E5540 @2.53GHz, 32bit kernel, FIB_TRIE) Before: real 1m1.662s user 0m14.373s sys 12m55.960s After: real 0m51.179s user 0m15.329s sys 10m15.942s Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-12Merge branch 'dccp' of git://eden-feed.erg.abdn.ac.uk/net-next-2.6David S. Miller
2010-10-12dccp: cosmetics - warning formatGerrit Renker
This omits the redundant "DCCP:" in warning messages, since DCCP_WARN() already echoes the function name, avoiding messages like kernel: [10988.766503] dccp_close: DCCP: ABORT -- 209 bytes unread Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
2010-10-12dccp: schedule an Ack when receiving timestampsGerrit Renker
This schedules an Ack when receiving a timestamp, exploiting the existing inet_csk_schedule_ack() function, saving one case in the `dccp_ack_pending()' function. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
2010-10-12dccp: generalise data-loss conditionIvo Calado
This patch generalises the task of determining data loss from RFC 4340, 7.7.1. Let S_A, S_B be sequence numbers such that S_B is "after" S_A, and let N_B be the NDP count of packet S_B. Then, using modulo-2^48 arithmetic, D = S_B - S_A - 1 is an upper bound of the number of lost data packets, D - N_B is an approximation of the number of lost data packets (there are cases where this is not exact). The patch implements this as dccp_loss_count(S_A, S_B, N_B) := max(S_B - S_A - 1 - N_B, 0) Signed-off-by: Ivo Calado <ivocalado@embedded.ufcg.edu.br> Signed-off-by: Erivaldo Xavier <desadoc@gmail.com> Signed-off-by: Leandro Sales <leandroal@gmail.com> Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
2010-10-12dccp: remove unused argument in CCID tx functionGerrit Renker
This removes the argument `more' from ccid_hc_tx_packet_sent, since it was nowhere used in the entire code. (Btw, this argument was not even used in the original KAME code where the function initially came from; compare the variable moreToSend in the freebsd61-dccp-kame-28.08.2006.patch kept by Emmanuel Lochin.) Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
2010-10-12dccp: merge now-reduced connect_init() functionGerrit Renker
After moving the assignment of GAR/ISS from dccp_connect_init() to dccp_transmit_skb(), the former function becomes very small, so that a merger with dccp_connect() suggests itself. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
2010-10-12dccp: fix the adjustments to AWL and SWLGerrit Renker
This fixes a problem and a potential loophole with regard to seqno/ackno validity: currently the initial adjustments to AWL/SWL are only performed once at the begin of the connection, during the handshake. Since the Sequence Window feature is always greater than Wmin=32 (7.5.2), it is however necessary to perform these adjustments at least for the first W/W' (variables as per 7.5.1) packets in the lifetime of a connection. This requirement is complicated by the fact that W/W' can change at any time during the lifetime of a connection. Therefore it is better to perform that safety check each time SWL/AWL are updated, as implemented by the patch. A second problem solved by this patch is that the remote/local Sequence Window feature values (which set the bounds for AWL/SWL/SWH) are undefined until the feature negotiation has completed. During the initial handshake we have more stringent sequence number protection; the changes added by this patch effect that {A,S}W{L,H} are within the correct bounds at the instant that feature negotiation completes (since the SeqWin feature activation handlers call dccp_update_gsr/gss()). Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
2010-10-11net dst: use a percpu_counter to track entriesEric Dumazet
struct dst_ops tracks number of allocated dst in an atomic_t field, subject to high cache line contention in stress workload. Switch to a percpu_counter, to reduce number of time we need to dirty a central location. Place it on a separate cache line to avoid dirtying read only fields. Stress test : (Sending 160.000.000 UDP frames, IP route cache disabled, dual E5540 @2.53GHz, 32bit kernel, FIB_TRIE, SLUB/NUMA) Before: real 0m51.179s user 0m15.329s sys 10m15.942s After: real 0m45.570s user 0m15.525s sys 9m56.669s With a small reordering of struct neighbour fields, subject of a following patch, (to separate refcnt from other read mostly fields) real 0m41.841s user 0m15.261s sys 8m45.949s Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-11neigh: Protect neigh->ha[] with a seqlockEric Dumazet
Add a seqlock in struct neighbour to protect neigh->ha[], and avoid dirtying neighbour in stress situation (many different flows / dsts) Dirtying takes place because of read_lock(&n->lock) and n->used writes. Switching to a seqlock, and writing n->used only on jiffies changes permits less dirtying. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-11Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: net/core/ethtool.c
2010-10-11net: clear heap allocations for privileged ethtool actionsKees Cook
Several other ethtool functions leave heap uncleared (potentially) by drivers. Some interfaces appear safe (eeprom, etc), in that the sizes are well controlled. In some situations (e.g. unchecked error conditions), the heap will remain unchanged in areas before copying back to userspace. Note that these are less of an issue since these all require CAP_NET_ADMIN. Cc: stable@kernel.org Signed-off-by: Kees Cook <kees.cook@canonical.com> Acked-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-11ATM: mpc, fix use after freeJiri Slaby
Stanse found that mpc_push frees skb and then it dereferences it. It is a typo, new_skb should be dereferenced there. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-11neigh: speedup neigh_hh_init()Eric Dumazet
When a new dst is used to send a frame, neigh_resolve_output() tries to associate an struct hh_cache to this dst, calling neigh_hh_init() with the neigh rwlock write locked. Most of the time, hh_cache is already known and linked into neighbour, so we find it and increment its refcount. This patch changes the logic so that we call neigh_hh_init() with neighbour lock read locked only, so that fast path can be run in parallel by concurrent cpus. This brings part of the speedup we got with commit c7d4426a98a5f (introduce DST_NOCACHE flag) for non cached dsts, even for cached ones, removing one of the contention point that routers hit on multiqueue enabled machines. Further improvements would need to use a seqlock instead of an rwlock to protect neigh->ha[], to not dirty neigh too often and remove two atomic ops. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-11irda: Fix heap memory corruption in iriap.cSamuel Ortiz
While parsing the GetValuebyClass command frame, we could potentially write passed the skb->data pointer. Cc: stable@kernel.org Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com> Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
2010-10-11irda: Fix parameter extraction stack overflowSamuel Ortiz
Cc: stable@kernel.org Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com> Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
2010-10-11irda: Remove BKL instances from irnetSamuel Ortiz
The code intends to lock the irnet_socket, so adding a mutex to it allows for a complet BKL removal. Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
2010-10-11irda: Remove BKL instances from af_irda.cSamuel Ortiz
Most of the times, lock_kernel() was pointless or could simply be replaced by lock_sock(). Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
2010-10-09net_sched: use __TCA_HTB_MAX and TCA_HTB_MAXChangli Gao
Signed-off-by: Changli Gao <xiaosuo@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-08net: Fix rxq ref countingTom Herbert
The rx->count reference is used to track reference counts to the number of rx-queue kobjects created for the device. This patch eliminates initialization of the counter in netif_alloc_rx_queues and instead increments the counter each time a kobject is created. This is now symmetric with the decrement that is done when an object is released. Signed-off-by: Tom Herbert <therbert@google.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-08Phonet: mark the pipe controller as EXPERIMENTALRémi Denis-Courmont
There are a bunch of issues that need to be fixed, including: - GFP_KERNEL allocations from atomic context (and GFP_ATOMIC in process context), - abuse of the setsockopt() call convention, - unprotected/unlocked static variables... IMHO, we will need to alter the userspace ABI when we fix it. So mark the configuration option as EXPERIMENTAL for the time being (or should it be BROKEN instead?). Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-08Phonet: cleanup pipe enable socket optionRémi Denis-Courmont
The current code works like this: int garbage, status; socklen_t len = sizeof(status); /* enable pipe */ setsockopt(fd, SOL_PNPIPE, PNPIPE_ENABLE, &garbage, sizeof(garbage)); /* disable pipe */ setsockopt(fd, SOL_PNPIPE, PNPIPE_DISABLE, &garbage, sizeof(garbage)); /* get status */ getsockopt(fd, SOL_PNPIPE, PNPIPE_INQ, &status, &len); ...which does not follow the usual socket option pattern. This patch merges all three "options" into a single gettable&settable option, before Linux 2.6.37 gets out: int status; socklen_t len = sizeof(status); /* enable pipe */ status = 1; setsockopt(fd, SOL_PNPIPE, PNPIPE_ENABLE, &status, sizeof(status)); /* disable pipe */ status = 0; setsockopt(fd, SOL_PNPIPE, PNPIPE_ENABLE, &status, sizeof(status)); /* get status */ getsockopt(fd, SOL_PNPIPE, PNPIPE_ENABLE, &status, &len); This also fixes the error code from EFAULT to ENOTCONN. Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Cc: Kumar Sanghvi <kumar.sanghvi@stericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-08Phonet: advise against enabling the pipe controllerRémi Denis-Courmont
As it currently is, the new code path is not compatible with existing Nokia modems. This would break existing userspace for Nokia modem, such as the existing oFono ISI driver. Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-08Merge branch 'for-davem' of ↵David S. Miller
git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6
2010-10-08Merge branch 'master' of ↵John W. Linville
git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 into for-davem Conflicts: Documentation/feature-removal-schedule.txt drivers/net/wireless/ipw2x00/ipw2200.c
2010-10-08ipv4: Remove leftover rcu_read_unlock calls from __mkroute_output()Dimitris Michailidis
Commit "fib: RCU conversion of fib_lookup()" removed rcu_read_lock() from __mkroute_output but left a couple of calls to rcu_read_unlock() in there. This causes lockdep to complain that the rcu_read_unlock() call in __ip_route_output_key causes a lock inbalance and quickly crashes the kernel. The below fixes this for me. Signed-off-by: Dimitris Michailidis <dm@chelsio.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-08net: clear heap allocation for ETHTOOL_GRXCLSRLALLKees Cook
Calling ETHTOOL_GRXCLSRLALL with a large rule_cnt will allocate kernel heap without clearing it. For the one driver (niu) that implements it, it will leave the unused portion of heap unchanged and copy the full contents back to userspace. Signed-off-by: Kees Cook <kees.cook@canonical.com> Acked-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-08Merge branch 'master' of ↵David S. Miller
git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6
2010-10-08net: Update kernel-doc for netif_set_real_num_rx_queues()Ben Hutchings
Synchronise the comment with the preceding implementation change. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-07cfg80211: constify WDS addressJohannes Berg
There's no need for the WDS peer address to not be const, so make it const. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-10-07nl80211: use new genl helpers for WDSJohannes Berg
Bill Jordan's patch to allow setting the WDS peer crossed with my patch removing all the boilerplate code in nl80211, and consequently he didn't make use of it yet. Fix that. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-10-07mac80211: fix sw scan lockingJohannes Berg
The recent scan overhaul broke locking because now we can jump to code that attempts to unlock, while we don't have the mutex held. Fix this by holding the mutex around all the relevant code. Reported-by: Ben Greear <greearb@candelatech.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-10-07Merge branch 'master' of ↵John W. Linville
git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6
2010-10-07Revert "mac80211: use netif_receive_skb in ieee80211_tx_status callpath"John W. Linville
This reverts commit 5ed3bc7288487bd4f891f420a07319e0b538b4fe. It turns-out that not all drivers are calling ieee80211_tx_status from a compatible context. Revert this for now and try again later... Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-10-07Merge branch 'master' of ↵David S. Miller
git://git.kernel.org/pub/scm/linux/kernel/git/padovan/bluetooth-2.6
2010-10-07net: netif_set_real_num_rx_queues may cap num_rx_queues at init timeJohn Fastabend
Do not set num_rx_queues in netif_set_real_num_rx_queues() some drivers will increase the real_num_rx_queues later due to a feature changes or available interrupts increasing. By setting num_rx_queues here this ends up creating a cap on the number of rx queues available. For example the ixgbe driver sets the max number of queues it intends to use ever then sets the current number in use with the netif_set_num_{rx|tx}_queues calls. With the current implementation the number of rx queues gets limited so when a feature such as DCB or FCoE is enabled the queues are no longer available. kobjects will only be allocated for real_num_rx_queues so the waste in memory is minimal. Signed-off-by: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-07dccp: Kill dead code and add static markers.stephen hemminger
Remove dead code and make some functions static. Compile tested only. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-07TCP: Fix setting of snd_ssthresh in tcp_mtu_probe_successJohn Heffner
This looks like a simple typo that has gone unnoticed for some time. The impact is relatively low but it's clearly wrong. Signed-off-by: John Heffner <johnwheffner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-07Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: drivers/net/pcmcia/pcnet_cs.c net/caif/caif_socket.c
2010-10-07Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
2010-10-07neigh: RCU conversion of struct neighbourEric Dumazet
This is the second step for neighbour RCU conversion. (first was commit d6bf7817 : RCU conversion of neigh hash table) neigh_lookup() becomes lockless, but still take a reference on found neighbour. (no more read_lock()/read_unlock() on tbl->lock) struct neighbour gets an additional rcu_head field and is freed after an RCU grace period. Future work would need to eventually not take a reference on neighbour for temporary dst (DST_NOCACHE), but this would need dst->_neighbour to use a noref bit like we did for skb->_dst. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-06mac80211: avoid uninitialized var warning in ieee80211_scan_cancelJohn W. Linville
net/mac80211/scan.c: In function ‘ieee80211_scan_cancel’: net/mac80211/scan.c:794: warning: ‘finish’ may be used uninitialized in this function Signed-off-by: John W. Linville <linville@tuxdriver.com>
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