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2016-07-08tun: Don't assume type tun in tun_device_eventCraig Gallek1-0/+3
The referenced change added a netlink notifier for processing device queue size events. These events are fired for all devices but the registered callback assumed they only occurred for tun devices. This fix adds a check (borrowed from macvtap.c) to discard non-tun device events. For reference, this fixes the following splat: [ 71.505935] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 [ 71.513870] IP: [<ffffffff8153c1a0>] tun_device_event+0x110/0x340 [ 71.519906] PGD 3f41f56067 PUD 3f264b7067 PMD 0 [ 71.524497] Oops: 0002 [#1] SMP DEBUG_PAGEALLOC [ 71.529374] gsmi: Log Shutdown Reason 0x03 [ 71.533417] Modules linked in:[ 71.533826] mlx4_en: eth1: Link Up [ 71.539616] bonding w1_therm wire cdc_acm ehci_pci ehci_hcd mlx4_en ib_uverbs mlx4_ib ib_core mlx4_core [ 71.549282] CPU: 12 PID: 7915 Comm: set.ixion-haswe Not tainted 4.7.0-dbx-DEV #8 [ 71.556586] Hardware name: Intel Grantley,Wellsburg/Ixion_IT_15, BIOS 2.58.0 05/03/2016 [ 71.564495] task: ffff887f00bb20c0 ti: ffff887f00798000 task.ti: ffff887f00798000 [ 71.571894] RIP: 0010:[<ffffffff8153c1a0>] [<ffffffff8153c1a0>] tun_device_event+0x110/0x340 [ 71.580327] RSP: 0018:ffff887f0079bbd8 EFLAGS: 00010202 [ 71.585576] RAX: fffffffffffffae8 RBX: ffff887ef6d03378 RCX: 0000000000000000 [ 71.592624] RDX: 0000000000000000 RSI: 0000000000000028 RDI: 0000000000000000 [ 71.599675] RBP: ffff887f0079bc48 R08: 0000000000000000 R09: 0000000000000001 [ 71.606730] R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000010 [ 71.613780] R13: 0000000000000000 R14: 0000000000000001 R15: ffff887f0079bd00 [ 71.620832] FS: 00007f5cdc581700(0000) GS:ffff883f7f700000(0000) knlGS:0000000000000000 [ 71.628826] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 71.634500] CR2: 0000000000000010 CR3: 0000003f3eb62000 CR4: 00000000001406e0 [ 71.641549] Stack: [ 71.643533] ffff887f0079bc08 0000000000000246 000000000000001e ffff887ef6d00000 [ 71.650871] ffff887f0079bd00 0000000000000000 0000000000000000 ffffffff00000000 [ 71.658210] ffff887f0079bc48 ffffffff81d24070 00000000fffffff9 ffffffff81cec7a0 [ 71.665549] Call Trace: [ 71.667975] [<ffffffff810eeb0d>] notifier_call_chain+0x5d/0x80 [ 71.673823] [<ffffffff816365d0>] ? show_tx_maxrate+0x30/0x30 [ 71.679502] [<ffffffff810eeb3e>] __raw_notifier_call_chain+0xe/0x10 [ 71.685778] [<ffffffff810eeb56>] raw_notifier_call_chain+0x16/0x20 [ 71.691976] [<ffffffff8160eb30>] call_netdevice_notifiers_info+0x40/0x70 [ 71.698681] [<ffffffff8160ec36>] call_netdevice_notifiers+0x16/0x20 [ 71.704956] [<ffffffff81636636>] change_tx_queue_len+0x66/0x90 [ 71.710807] [<ffffffff816381ef>] netdev_store.isra.5+0xbf/0xd0 [ 71.716658] [<ffffffff81638350>] tx_queue_len_store+0x50/0x60 [ 71.722431] [<ffffffff814a6798>] dev_attr_store+0x18/0x30 [ 71.727857] [<ffffffff812ea3ff>] sysfs_kf_write+0x4f/0x70 [ 71.733274] [<ffffffff812e9507>] kernfs_fop_write+0x147/0x1d0 [ 71.739045] [<ffffffff81134a4f>] ? rcu_read_lock_sched_held+0x8f/0xa0 [ 71.745499] [<ffffffff8125a108>] __vfs_write+0x28/0x120 [ 71.750748] [<ffffffff8111b137>] ? percpu_down_read+0x57/0x90 [ 71.756516] [<ffffffff8125d7d8>] ? __sb_start_write+0xc8/0xe0 [ 71.762278] [<ffffffff8125d7d8>] ? __sb_start_write+0xc8/0xe0 [ 71.768038] [<ffffffff8125bd5e>] vfs_write+0xbe/0x1b0 [ 71.773113] [<ffffffff8125c092>] SyS_write+0x52/0xa0 [ 71.778110] [<ffffffff817528e5>] entry_SYSCALL_64_fastpath+0x18/0xa8 [ 71.784472] Code: 45 31 f6 48 8b 93 78 33 00 00 48 81 c3 78 33 00 00 48 39 d3 48 8d 82 e8 fa ff ff 74 25 48 8d b0 40 05 00 00 49 63 d6 41 83 c6 01 <49> 89 34 d4 48 8b 90 18 05 00 00 48 39 d3 48 8d 82 e8 fa ff ff [ 71.803655] RIP [<ffffffff8153c1a0>] tun_device_event+0x110/0x340 [ 71.809769] RSP <ffff887f0079bbd8> [ 71.813213] CR2: 0000000000000010 [ 71.816512] ---[ end trace 4db6449606319f73 ]--- Fixes: 1576d9860599 ("tun: switch to use skb array for tx") Signed-off-by: Craig Gallek <kraig@google.com> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-07-04tun: fix build warningsJason Wang1-3/+5
Stephen Rothwell reports a build warnings(powerpc ppc64_defconfig) drivers/net/tun.c: In function 'tun_do_read.part.5': /home/sfr/next/next/drivers/net/tun.c:1491:6: warning: 'err' may be used uninitialized in this function [-Wmaybe-uninitialized] int err; This is because tun_ring_recv() may return an uninitialized err, fix this. Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-07-01tun: switch to use skb array for txJason Wang1-8/+130
We used to queue tx packets in sk_receive_queue, this is less efficient since it requires spinlocks to synchronize between producer and consumer. This patch tries to address this by: - switch from sk_receive_queue to a skb_array, and resize it when tx_queue_len was changed. - introduce a new proto_ops peek_len which was used for peeking the skb length. - implement a tun version of peek_len for vhost_net to use and convert vhost_net to use peek_len if possible. Pktgen test shows about 15.3% improvement on guest receiving pps for small buffers: Before: ~1300000pps After : ~1500000pps Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-06-15tun: fix csum generation for tap devicesPaolo Abeni1-7/+7
The commit 34166093639b ("tuntap: use common code for virtio_net_hdr and skb GSO conversion") replaced the tun code for header manipulation with the generic helpers. While doing so, it implictly moved the skb_partial_csum_set() invocation after eth_type_trans(), which invalidate the current gso start/offset values. Fix it by moving the helper invocation before the mac pulling. Fixes: 34166093639 ("tuntap: use common code for virtio_net_hdr and skb GSO conversion") Signed-off-by: Paolo Abeni <pabeni@redhat.com> Acked-by: Mike Rapoport <rppt@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-06-10tuntap: use common code for virtio_net_hdr and skb GSO conversionMike Rapoport1-76/+21
Replace open coded conversion between virtio_net_hdr to skb GSO info with virtio_net_hdr_{from,to}_skb Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-05-20tuntap: correctly wake up process during uninitJason Wang1-3/+3
We used to check dev->reg_state against NETREG_REGISTERED after each time we are woke up. But after commit 9e641bdcfa4e ("net-tun: restructure tun_do_read for better sleep/wakeup efficiency"), it uses skb_recv_datagram() which does not check dev->reg_state. This will result if we delete a tun/tap device after a process is blocked in the reading. The device will wait for the reference count which was held by that process for ever. Fixes this by using RCV_SHUTDOWN which will be checked during sk_recv_datagram() before trying to wake up the process during uninit. Fixes: 9e641bdcfa4e ("net-tun: restructure tun_do_read for better sleep/wakeup efficiency") Cc: Eric Dumazet <edumazet@google.com> Cc: Xi Wang <xii@google.com> Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Acked-by: Eric Dumazet <edumazet@google.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-28tuntap: calculate rps hash only when neededJason Wang1-1/+3
There's no need to calculate rps hash if it was not enabled. So this patch export rps_needed and check it before trying to get rps hash. Tests (using pktgen to inject packets to guest) shows this can improve pps about 13% (when rps is disabled). Before: ~1150000 pps After: ~1300000 pps Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> ---- Changes from V1: - Fix build when CONFIG_RPS is not set Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-18tun: don't require serialization lock on txPaolo Abeni1-1/+1
The current tun_net_xmit() implementation don't need any external lock since it relies on rcu protection for the tun data structure and on socket queue lock for skb queuing. This patch set the NETIF_F_LLTX feature bit in the tun device, so that on xmit, in absence of qdisc, no serialization lock is acquired by the caller. The user space can remove the default tun qdisc with: tc qdisc replace dev <tun device name> root noqueue Signed-off-by: Paolo Abeni <pabeni@redhat.com> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Acked-by: Eric Dumazet <edumazet@google.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-14tun: use per cpu variables for stats accountingPaolo Abeni1-12/+83
Currently the tun device accounting uses dev->stats without applying any kind of protection, regardless that accounting happens in preemptible process context. This patch move the tun stats to a per cpu data structure, and protect the updates with u64_stats_update_begin()/u64_stats_update_end() or this_cpu_inc according to the stat type. The per cpu stats are aggregated by the newly added ndo_get_stats64 ops. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-09Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller1-2/+2
2016-04-08tuntap: restore default qdiscJason Wang1-2/+2
After commit f84bb1eac027 ("net: fix IFF_NO_QUEUE for drivers using alloc_netdev"), default qdisc was changed to noqueue because tuntap does not set tx_queue_len during .setup(). This patch restores default qdisc by setting tx_queue_len in tun_setup(). Fixes: f84bb1eac027 ("net: fix IFF_NO_QUEUE for drivers using alloc_netdev") Cc: Phil Sutter <phil@nwl.cc> Signed-off-by: Jason Wang <jasowang@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Phil Sutter <phil@nwl.cc> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-07tun: use socket locks for sk_{attach,detatch}_filterHannes Frederic Sowa1-5/+9
This reverts commit 5a5abb1fa3b05dd ("tun, bpf: fix suspicious RCU usage in tun_{attach, detach}_filter") and replaces it to use lock_sock around sk_{attach,detach}_filter. The checks inside filter.c are updated with lockdep_sock_is_held to check for proper socket locks. It keeps the code cleaner by ensuring that only one lock governs the socket filter instead of two independent locks. Cc: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-04sock: enable timestamping using control messagesSoheil Hassas Yeganeh1-1/+2
Currently, SOL_TIMESTAMPING can only be enabled using setsockopt. This is very costly when users want to sample writes to gather tx timestamps. Add support for enabling SO_TIMESTAMPING via control messages by using tsflags added in `struct sockcm_cookie` (added in the previous patches in this series) to set the tx_flags of the last skb created in a sendmsg. With this patch, the timestamp recording bits in tx_flags of the skbuff is overridden if SO_TIMESTAMPING is passed in a cmsg. Please note that this is only effective for overriding the recording timestamps flags. Users should enable timestamp reporting (e.g., SOF_TIMESTAMPING_SOFTWARE | SOF_TIMESTAMPING_OPT_ID) using socket options and then should ask for SOF_TIMESTAMPING_TX_* using control messages per sendmsg to sample timestamps for each write. Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-01tun, bpf: fix suspicious RCU usage in tun_{attach, detach}_filterDaniel Borkmann1-3/+5
Sasha Levin reported a suspicious rcu_dereference_protected() warning found while fuzzing with trinity that is similar to this one: [ 52.765684] net/core/filter.c:2262 suspicious rcu_dereference_protected() usage! [ 52.765688] other info that might help us debug this: [ 52.765695] rcu_scheduler_active = 1, debug_locks = 1 [ 52.765701] 1 lock held by a.out/1525: [ 52.765704] #0: (rtnl_mutex){+.+.+.}, at: [<ffffffff816a64b7>] rtnl_lock+0x17/0x20 [ 52.765721] stack backtrace: [ 52.765728] CPU: 1 PID: 1525 Comm: a.out Not tainted 4.5.0+ #264 [...] [ 52.765768] Call Trace: [ 52.765775] [<ffffffff813e488d>] dump_stack+0x85/0xc8 [ 52.765784] [<ffffffff810f2fa5>] lockdep_rcu_suspicious+0xd5/0x110 [ 52.765792] [<ffffffff816afdc2>] sk_detach_filter+0x82/0x90 [ 52.765801] [<ffffffffa0883425>] tun_detach_filter+0x35/0x90 [tun] [ 52.765810] [<ffffffffa0884ed4>] __tun_chr_ioctl+0x354/0x1130 [tun] [ 52.765818] [<ffffffff8136fed0>] ? selinux_file_ioctl+0x130/0x210 [ 52.765827] [<ffffffffa0885ce3>] tun_chr_ioctl+0x13/0x20 [tun] [ 52.765834] [<ffffffff81260ea6>] do_vfs_ioctl+0x96/0x690 [ 52.765843] [<ffffffff81364af3>] ? security_file_ioctl+0x43/0x60 [ 52.765850] [<ffffffff81261519>] SyS_ioctl+0x79/0x90 [ 52.765858] [<ffffffff81003ba2>] do_syscall_64+0x62/0x140 [ 52.765866] [<ffffffff817d563f>] entry_SYSCALL64_slow_path+0x25/0x25 Same can be triggered with PROVE_RCU (+ PROVE_RCU_REPEATEDLY) enabled from tun_attach_filter() when user space calls ioctl(tun_fd, TUN{ATTACH, DETACH}FILTER, ...) for adding/removing a BPF filter on tap devices. Since the fix in f91ff5b9ff52 ("net: sk_{detach|attach}_filter() rcu fixes") sk_attach_filter()/sk_detach_filter() now dereferences the filter with rcu_dereference_protected(), checking whether socket lock is held in control path. Since its introduction in 994051625981 ("tun: socket filter support"), tap filters are managed under RTNL lock from __tun_chr_ioctl(). Thus the sock_owned_by_user(sk) doesn't apply in this specific case and therefore triggers the false positive. Extend the BPF API with __sk_attach_filter()/__sk_detach_filter() pair that is used by tap filters and pass in lockdep_rtnl_is_held() for the rcu_dereference_protected() checks instead. Reported-by: Sasha Levin <sasha.levin@oracle.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-03-01net/tun: implement ndo_set_rx_headroomPaolo Abeni1-1/+16
ndo_set_rx_headroom controls the align value used by tun devices to allocate skbs on frame reception. When the xmit device adds a large encapsulation, this avoids an skb head reallocation on forwarding. The measured improvement when forwarding towards a vxlan dev with frame size below the egress device MTU is as follow: vxlan over ipv6, bridged: +6% vxlan over ipv6, ovs: +7% In case of ipv4 tunnels there is no improvement, since the tun device default alignment provides enough headroom to avoid the skb head reallocation. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-12-17tun: honor IFF_UP in tun_get_user()Eric Dumazet1-0/+3
If a tun interface is turned down, we should not allow packet injection into the kernel. Kernel does not send packets to the tun already. TUNATTACHFILTER can not be used as only tun_net_xmit() is taking care of it. Reported-by: Curt Wohlgemuth <curtw@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-12-01net: rename SOCK_ASYNC_NOSPACE and SOCK_ASYNC_WAITDATAEric Dumazet1-2/+2
This patch is a cleanup to make following patch easier to review. Goal is to move SOCK_ASYNC_NOSPACE and SOCK_ASYNC_WAITDATA from (struct socket)->flags to a (struct socket_wq)->flags to benefit from RCU protection in sock_wake_async() To ease backports, we rename both constants. Two new helpers, sk_set_bit(int nr, struct sock *sk) and sk_clear_bit(int net, struct sock *sk) are added so that following patch can change their implementation. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-10-12tun: use sk_fullsock() before reading sk->sk_tsflagsEric Dumazet1-1/+1
timewait or request sockets are small and do not contain sk->sk_tsflags Without this fix, we might read garbage, and crash later in __skb_complete_tx_timestamp() -> sock_queue_err_skb() (These pseudo sockets do not have an error queue either) Fixes: ca6fb0651883 ("tcp: attach SYNACK messages to request sockets instead of listener") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Willem de Bruijn <willemb@google.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-08-03tuntap: Don't segment multiple tagged packets on tap deviceToshiaki Makita1-0/+1
Tap devices don't need to segment multiple tagged packets. Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-07-03Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhostLinus Torvalds1-2/+65
Pull virtio/vhost cross endian support from Michael Tsirkin: "I have just queued some more bugfix patches today but none fix regressions and none are related to these ones, so it looks like a good time for a merge for -rc1. The motivation for this is support for legacy BE guests on the new LE hosts. There are two redeeming properties that made me merge this: - It's a trivial amount of code: since we wrap host/guest accesses anyway, almost all of it is well hidden from drivers. - Sane platforms would never set flags like VHOST_CROSS_ENDIAN_LEGACY, and when it's clear, there's zero overhead (as some point it was tested by compiling with and without the patches, got the same stripped binary). Maybe we could create a Kconfig symbol to enforce the second point: prevent people from enabling it eg on x86. I will look into this" * tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: virtio-pci: alloc only resources actually used. macvtap/tun: cross-endian support for little-endian hosts vhost: cross-endian support for legacy devices virtio: add explicit big-endian support to memory accessors vhost: introduce vhost_is_little_endian() helper vringh: introduce vringh_is_little_endian() helper macvtap: introduce macvtap_is_little_endian() helper tun: add tun_is_little_endian() helper virtio: introduce virtio_is_little_endian() helper
2015-06-01macvtap/tun: cross-endian support for little-endian hostsGreg Kurz1-1/+58
The VNET_LE flag was introduced to fix accesses to virtio 1.0 headers that are always little-endian. It can also be used to handle the special case of a legacy little-endian device implemented by a big-endian host. Let's add a flag and ioctls for big-endian devices as well. If both flags are set, little-endian wins. Since this is isn't a common usecase, the feature is controlled by a kernel config option (not set by default). Both macvtap and tun are covered by this patch since they share the same API with userland. Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2015-06-01virtio: add explicit big-endian support to memory accessorsGreg Kurz1-1/+2
The current memory accessors logic is: - little endian if little_endian - native endian (i.e. no byteswap) if !little_endian If we want to fully support cross-endian vhost, we also need to be able to convert to big endian. Instead of changing the little_endian argument to some 3-value enum, this patch changes the logic to: - little endian if little_endian - big endian if !little_endian The native endian case is handled by all users with a trivial helper. This patch doesn't change any functionality, nor it does add overhead. Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2015-06-01tun: add tun_is_little_endian() helperGreg Kurz1-2/+7
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2015-05-11net: Pass kern from net_proto_family.create to sk_allocEric W. Biederman1-1/+1
In preparation for changing how struct net is refcounted on kernel sockets pass the knowledge that we are creating a kernel socket from sock_create_kern through to sk_alloc. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-05-11tun: Utilize the normal socket network namespace refcounting.Eric W. Biederman1-20/+4
There is no need for tun to do the weird network namespace refcounting. The existing network namespace refcounting in tfile has almost exactly the same lifetime. So rewrite the code to use the struct sock network namespace refcounting and remove the unnecessary hand rolled network namespace refcounting and the unncesary tfile->net. This change allows the tun code to directly call sock_put bypassing sock_release and making SOCK_EXTERNALLY_ALLOCATED unnecessary. Remove the now unncessary tun_release so that if anything tries to use the sock_release code path the kernel will oops, and let us know about the bug. The macvtap code already uses it's internal socket this way. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-04-11make new_sync_{read,write}() staticAl Viro1-2/+0
All places outside of core VFS that checked ->read and ->write for being NULL or called the methods directly are gone now, so NULL {read,write} with non-NULL {read,write}_iter will do the right thing in all cases. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-03-02net: Remove iocb argument from sendmsg and recvmsgYing Xue1-4/+2
After TIPC doesn't depend on iocb argument in its internal implementations of sendmsg() and recvmsg() hooks defined in proto structure, no any user is using iocb argument in them at all now. Then we can drop the redundant iocb argument completely from kinds of implementations of both sendmsg() and recvmsg() in the entire networking stack. Cc: Christoph Hellwig <hch@lst.de> Suggested-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-02-08net: rfs: add hash collision detectionEric Dumazet1-4/+1
Receive Flow Steering is a nice solution but suffers from hash collisions when a mix of connected and unconnected traffic is received on the host, when flow hash table is populated. Also, clearing flow in inet_release() makes RFS not very good for short lived flows, as many packets can follow close(). (FIN , ACK packets, ...) This patch extends the information stored into global hash table to not only include cpu number, but upper part of the hash value. I use a 32bit value, and dynamically split it in two parts. For host with less than 64 possible cpus, this gives 6 bits for the cpu number, and 26 (32-6) bits for the upper part of the hash. Since hash bucket selection use low order bits of the hash, we have a full hash match, if /proc/sys/net/core/rps_sock_flow_entries is big enough. If the hash found in flow table does not match, we fallback to RPS (if it is enabled for the rxqueue). This means that a packet for an non connected flow can avoid the IPI through a unrelated/victim CPU. This also means we no longer have to clear the table at socket close time, and this helps short lived flows performance. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-02-05Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller1-16/+9
Conflicts: drivers/net/vxlan.c drivers/vhost/net.c include/linux/if_vlan.h net/core/dev.c The net/core/dev.c conflict was the overlap of one commit marking an existing function static whilst another was adding a new function. In the include/linux/if_vlan.h case, the type used for a local variable was changed in 'net', whereas the function got rewritten to fix a stacked vlan bug in 'net-next'. In drivers/vhost/net.c, Al Viro's iov_iter conversions in 'net-next' overlapped with an endainness fix for VHOST 1.0 in 'net'. In drivers/net/vxlan.c, vxlan_find_vni() added a 'flags' parameter in 'net-next' whereas in 'net' there was a bug fix to pass in the correct network namespace pointer in calls to this function. Signed-off-by: David S. Miller <davem@davemloft.net>
2015-02-05tun: Use static attribute groups for sysfs entriesTakashi Iwai1-5/+12
Instead of manual calls of device_create_file() and device_remove_files(), assign the static attribute groups to netdev groups array. This simplifies the code and avoids the possible races. Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-02-03Revert "drivers/net: Disable UFO through virtio"Vlad Yasevich1-11/+8
This reverts commit 3d0ad09412ffe00c9afa201d01effdb6023d09b4. Now that GSO functionality can correctly track if the fragment id has been selected and select a fragment id if necessary, we can re-enable UFO on tap/macvap and virtio devices. Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-02-03Revert "drivers/net, ipv6: Select IPv6 fragment idents for virtio UFO packets"Vlad Yasevich1-5/+1
This reverts commit 5188cd44c55db3e92cd9e77a40b5baa7ed4340f7. Now that GSO layer can track if fragment id has been selected and can allocate one if necessary, we don't need to do this in tap and macvtap. This reverts most of the code and only keeps the new ipv6 fragment id generation function that is still needed. Fixes: 3d0ad09412ff (drivers/net: Disable UFO through virtio) Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-01-13net: rename vlan_tx_* helpers since "tx" is misleading thereJiri Pirko1-2/+2
The same macros are used for rx as well. So rename it. Signed-off-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-01-12tuntap: Increase the number of queues in tun.Pankaj Gupta1-4/+3
Networking under kvm works best if we allocate a per-vCPU RX and TX queue in a virtual NIC. This requires a per-vCPU queue on the host side. It is now safe to increase the maximum number of queues. Preceding patch: 'net: allow large number of rx queues' made sure this won't cause failures due to high order memory allocations. Increase it to 256: this is the max number of vCPUs KVM supports. Size of tun_struct changes from 8512 to 10496 after this patch. This keeps pages allocated for tun_struct before and after the patch to 3. Signed-off-by: Pankaj Gupta <pagupta@redhat.com> Reviewed-by: David Gibson <dgibson@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-12-31tun: return proper error code from tun_do_readAlex Gartrell1-1/+1
Instead of -1 with EAGAIN, read on a O_NONBLOCK tun fd will return 0. This fixes this by properly returning the error code from __skb_recv_datagram. Signed-off-by: Alex Gartrell <agartrell@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-12-31tun: Fixed unsigned/signed comparisonAlex Gartrell1-1/+1
Validated that this was actually using the unsigned comparison with gdb. Signed-off-by: Alex Gartrell <agartrell@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-12-16tun: drop broken IFF_VNET_LEMichael S. Tsirkin1-3/+23
Use TUNSETVNETLE/TUNGETVNETLE instead. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-12-11Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-nextLinus Torvalds1-72/+62
Pull networking updates from David Miller: 1) New offloading infrastructure and example 'rocker' driver for offloading of switching and routing to hardware. This work was done by a large group of dedicated individuals, not limited to: Scott Feldman, Jiri Pirko, Thomas Graf, John Fastabend, Jamal Hadi Salim, Andy Gospodarek, Florian Fainelli, Roopa Prabhu 2) Start making the networking operate on IOV iterators instead of modifying iov objects in-situ during transfers. Thanks to Al Viro and Herbert Xu. 3) A set of new netlink interfaces for the TIPC stack, from Richard Alpe. 4) Remove unnecessary looping during ipv6 routing lookups, from Martin KaFai Lau. 5) Add PAUSE frame generation support to gianfar driver, from Matei Pavaluca. 6) Allow for larger reordering levels in TCP, which are easily achievable in the real world right now, from Eric Dumazet. 7) Add a variable of napi_schedule that doesn't need to disable cpu interrupts, from Eric Dumazet. 8) Use a doubly linked list to optimize neigh_parms_release(), from Nicolas Dichtel. 9) Various enhancements to the kernel BPF verifier, and allow eBPF programs to actually be attached to sockets. From Alexei Starovoitov. 10) Support TSO/LSO in sunvnet driver, from David L Stevens. 11) Allow controlling ECN usage via routing metrics, from Florian Westphal. 12) Remote checksum offload, from Tom Herbert. 13) Add split-header receive, BQL, and xmit_more support to amd-xgbe driver, from Thomas Lendacky. 14) Add MPLS support to openvswitch, from Simon Horman. 15) Support wildcard tunnel endpoints in ipv6 tunnels, from Steffen Klassert. 16) Do gro flushes on a per-device basis using a timer, from Eric Dumazet. This tries to resolve the conflicting goals between the desired handling of bulk vs. RPC-like traffic. 17) Allow userspace to ask for the CPU upon what a packet was received/steered, via SO_INCOMING_CPU. From Eric Dumazet. 18) Limit GSO packets to half the current congestion window, from Eric Dumazet. 19) Add a generic helper so that all drivers set their RSS keys in a consistent way, from Eric Dumazet. 20) Add xmit_more support to enic driver, from Govindarajulu Varadarajan. 21) Add VLAN packet scheduler action, from Jiri Pirko. 22) Support configurable RSS hash functions via ethtool, from Eyal Perry. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1820 commits) Fix race condition between vxlan_sock_add and vxlan_sock_release net/macb: fix compilation warning for print_hex_dump() called with skb->mac_header net/mlx4: Add support for A0 steering net/mlx4: Refactor QUERY_PORT net/mlx4_core: Add explicit error message when rule doesn't meet configuration net/mlx4: Add A0 hybrid steering net/mlx4: Add mlx4_bitmap zone allocator net/mlx4: Add a check if there are too many reserved QPs net/mlx4: Change QP allocation scheme net/mlx4_core: Use tasklet for user-space CQ completion events net/mlx4_core: Mask out host side virtualization features for guests net/mlx4_en: Set csum level for encapsulated packets be2net: Export tunnel offloads only when a VxLAN tunnel is created gianfar: Fix dma check map error when DMA_API_DEBUG is enabled cxgb4/csiostor: Don't use MASTER_MUST for fw_hello call net: fec: only enable mdio interrupt before phy device link up net: fec: clear all interrupt events to support i.MX6SX net: fec: reset fep link status in suspend function net: sock: fix access via invalid file descriptor net: introduce helper macro for_each_cmsghdr ...
2014-12-11Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhostLinus Torvalds1-97/+71
Pull virtio updates from Michael Tsirkin: "virtio: virtio 1.0 support, misc patches This adds a lot of infrastructure for virtio 1.0 support. Notable missing pieces: virtio pci, virtio balloon (needs spec extension), vhost scsi. Plus, there are some minor fixes in a couple of places. Note: some net drivers are affected by these patches. David said he's fine with merging these patches through my tree. Rusty's on vacation, he acked using my tree for these, too" * tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: (70 commits) virtio_ccw: finalize_features error handling virtio_ccw: future-proof finalize_features virtio_pci: rename virtio_pci -> virtio_pci_common virtio_pci: update file descriptions and copyright virtio_pci: split out legacy device support virtio_pci: setup config vector indirectly virtio_pci: setup vqs indirectly virtio_pci: delete vqs indirectly virtio_pci: use priv for vq notification virtio_pci: free up vq->priv virtio_pci: fix coding style for structs virtio_pci: add isr field virtio: drop legacy_only driver flag virtio_balloon: drop legacy_only driver flag virtio_ccw: rev 1 devices set VIRTIO_F_VERSION_1 virtio: allow finalize_features to fail virtio_ccw: legacy: don't negotiate rev 1/features virtio: add API to detect legacy devices virtio_console: fix sparse warnings vhost: remove unnecessary forward declarations in vhost.h ...
2014-12-09put iov_iter into msghdrAl Viro1-6/+2
Note that the code _using_ ->msg_iter at that point will be very unhappy with anything other than unshifted iovec-backed iov_iter. We still need to convert users to proper primitives. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-12-09tun: TUN_VNET_LE support, fix sparse warnings for virtio headersMichael S. Tsirkin1-19/+29
Pretty straight-forward: convert all fields to/from virtio endian-ness. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Jason Wang <jasowang@redhat.com>
2014-12-09tun: drop most type definesMichael S. Tsirkin1-34/+28
It's just as easy to use IFF_ flags directly, there's no point in adding our own defines. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-12-09tun: move internal flag defines out of uapiMichael S. Tsirkin1-51/+21
TUN_ flags are internal and never exposed to userspace. Any application using it is almost certainly buggy. Move them out to tun.c. Note: we remove these completely in follow-up patches, this code movement is split out for ease of review. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2014-12-08Merge branch 'iov_iter' into for-nextAl Viro1-20/+33
2014-12-05tun/macvtap: use consume_skb() instead of kfree_skb() when neededJason Wang1-1/+4
To be more friendly with drop monitor, we should only call kfree_skb() when the packets were dropped and use consume_skb() in other cases. Cc: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-12-02tun: Fix GSO meta-data handling in tun_get_userHerbert Xu1-1/+1
When we write the GSO meta-data in tun_get_user we end up advancing the IO vector twice, thus exhausting the user buffer before we can finish writing the packet. Fixes: f5ff53b4d97c ("{macvtap,tun}_get_user(): switch to iov_iter") Reported-by: Marcelo Ricardo Leitner <mleitner@redhat.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-11-24{macvtap,tun}_get_user(): switch to iov_iterAl Viro1-20/+24
allows to switch macvtap and tun from ->aio_write() to ->write_iter() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-11-24switch drivers/net/tun.c to ->read_iter()Al Viro1-25/+15
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-11-19tun: return NET_XMIT_DROP for dropped packetsJason Wang1-1/+1
After commit 5d097109257c03a71845729f8db6b5770c4bbedc ("tun: only queue packets on device"), NETDEV_TX_OK was returned for dropped packets. This will confuse pktgen since dropped packets were counted as sent ones. Fixing this by returning NET_XMIT_DROP to let pktgen count it as error packet. Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-11-13tun: fix issues of iovec iterators using in tun_put_user()Jason Wang1-1/+3
This patch fixes two issues after using iovec iterators: - vlan_offset should be initialized to zero, otherwise unexpected offset will be used in skb_copy_datagram_iter() - advance iovec iterator when vnet_hdr_sz is greater than sizeof(gso), this is the case when mergeable rx buffer were enabled for a virt guest. Fixes e0b46d0ee9c240c7430a47e9b0365674d4a04522 ("tun: Use iovec iterators") Cc: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Jason Wang <jasowang@redhat.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
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