- 03 Feb, 2015 7 commits
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David Vrabel authored
After commit e9d8b2c2 (xen-netback: disable rogue vif in kthread context), a fatal (protocol) error would leave the guest Rx thread spinning, wasting CPU time. Commit ecf08d2d (xen-netback: reintroduce guest Rx stall detection) made this even worse by removing a cond_resched() from this path. Since a fatal error is non-recoverable, just allow the guest Rx thread to exit. This requires taking additional refs to the task so the thread exiting early is handled safely. Signed-off-by:
David Vrabel <david.vrabel@citrix.com> Reported-by:
Julien Grall <julien.grall@linaro.org> Tested-by:
Wei Liu <wei.liu2@citrix.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Jack Morgenstein authored
Commit de966c59 (net/mlx4_core: Support more than 64 VFs) was meant to allow up to 126 VFs. However, due to leaving MLX4_MFUNC_MAX too low, using more than 80 VFs resulted in memory corruptions (and Oopses) when more than 80 VFs were requested. In addition, the number of slaves was left too high. This commit fixes these issues. Fixes: de966c59 ("net/mlx4_core: Support more than 64 VFs") Signed-off-by:
Jack Morgenstein <jackm@dev.mellanox.co.il> Signed-off-by:
Amir Vadai <amirv@mellanox.com> Signed-off-by:
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Dan Carpenter authored
The bug here is that we use "Reject" as the index into the cau_t[] array in the else path. Since the cau_t[] has 9 elements if Reject == 9 then we are reading beyond the end of the array. My understanding of the code is that it's saying that if Reject is 1 or too high then that's invalid and we should hang up. Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nfDavid S. Miller authored
Pablo Neira Ayuso says: ==================== Netfilter/IPVS fixes for net The following patchset contains Netfilter/IPVS fixes for your net tree, they are: 1) Validate hooks for nf_tables NAT expressions, otherwise users can crash the kernel when using them from the wrong hook. We already got one user trapped on this when configuring masquerading. 2) Fix a BUG splat in nf_tables with CONFIG_DEBUG_PREEMPT=y. Reported by Andreas Schultz. 3) Avoid unnecessary reroute of traffic in the local input path in IPVS that triggers a crash in in xfrm. Reported by Florian Wiessner and fixes by Julian Anastasov. 4) Fix memory and module refcount leak from the error path of nf_tables_newchain(). ==================== Signed-off-by: -
Richard Weinberger authored
Update netlink_mmap.txt wrt. commit 4682a035 ("netlink: Always copy on mmap TX."). Signed-off-by:
Richard Weinberger <richard@nod.at> Signed-off-by:
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David L Stevens authored
This patch fixes a bug where vnet_skb_shape() didn't set the already-selected queue mapping when a packet copy was required. This results in using the wrong queue index for stops/starts, hung tx queues and watchdog timeouts under heavy load. Signed-off-by:
David L Stevens <david.stevens@oracle.com> Acked-by:
Sowmini Varadhan <sowmini.varadhan@oracle.com> Signed-off-by:
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Marcelo Leitner authored
Currently qlge_update_hw_vlan_features() will always first put the interface down, then update features and then bring it up again. But it is possible to hit this code while the adapter is down and this causes a non-paired call to napi_disable(), which will get stuck. This patch fixes it by skipping these down/up actions if the interface is already down. Fixes: a45adbe8 ("qlge: Enhance nested VLAN (Q-in-Q) handling.") Cc: Harish Patil <harish.patil@qlogic.com> Signed-off-by:
Marcelo Ricardo Leitner <mleitner@redhat.com> Signed-off-by:
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- 02 Feb, 2015 1 commit
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Eric Dumazet authored
In commit be9f4a44 ("ipv4: tcp: remove per net tcp_sock") I tried to address contention on a socket lock, but the solution I chose was horrible : commit 3a7c384f ("ipv4: tcp: unicast_sock should not land outside of TCP stack") addressed a selinux regression. commit 0980e56e ("ipv4: tcp: set unicast_sock uc_ttl to -1") took care of another regression. commit b5ec8eea ("ipv4: fix ip_send_skb()") fixed another regression. commit 811230cd ("tcp: ipv4: initialize unicast_sock sk_pacing_rate") was another shot in the dark. Really, just use a proper socket per cpu, and remove the skb_orphan() call, to re-enable flow control. This solves a serious problem with FQ packet scheduler when used in hostile environments, as we do not want to allocate a flow structure for every RST packet sent in response to a spoofed packet. Signed-off-by:
Eric Dumazet <edumazet@google.com> Signed-off-by:
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- 01 Feb, 2015 2 commits
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Eric Dumazet authored
Doing the following commands on a non idle network device panics the box instantly, because cpu_bstats gets overwritten by stats. tc qdisc add dev eth0 root <your_favorite_qdisc> ... some traffic (one packet is enough) ... tc qdisc replace dev eth0 root est 1sec 4sec <your_favorite_qdisc> [ 325.355596] BUG: unable to handle kernel paging request at ffff8841dc5a074c [ 325.362609] IP: [<ffffffff81541c9e>] __gnet_stats_copy_basic+0x3e/0x90 [ 325.369158] PGD 1fa7067 PUD 0 [ 325.372254] Oops: 0000 [#1] SMP [ 325.375514] Modules linked in: ... [ 325.398346] CPU: 13 PID: 14313 Comm: tc Not tainted 3.19.0-smp-DEV #1163 [ 325.412042] task: ffff8800793ab5d0 ti: ffff881ff2fa4000 task.ti: ffff881ff2fa4000 [ 325.419518] RIP: 0010:[<ffffffff81541c9e>] [<ffffffff81541c9e>] __gnet_stats_copy_basic+0x3e/0x90 [ 325.428506] RSP: 0018:ffff881ff2fa7928 EFLAGS: 00010286 [ 325.433824] RAX: 000000000000000c RBX: ffff881ff2fa796c RCX: 000000000000000c [ 325.440988] RDX: ffff8841dc5a0744 RSI: 0000000000000060 RDI: 0000000000000060 [ 325.448120] RBP: ffff881ff2fa7948 R08: ffffffff81cd4f80 R09: 0000000000000000 [ 325.455268] R10: ffff883ff223e400 R11: 0000000000000000 R12: 000000015cba0744 [ 325.462405] R13: ffffffff81cd4f80 R14: ffff883ff223e460 R15: ffff883feea0722c [ 325.469536] FS: 00007f2ee30fa700(0000) GS:ffff88407fa20000(0000) knlGS:0000000000000000 [ 325.477630] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 325.483380] CR2: ffff8841dc5a074c CR3: 0000003feeae9000 CR4: 00000000001407e0 [ 325.490510] Stack: [ 325.492524] ffff883feea0722c ffff883fef719dc0 ffff883feea0722c ffff883ff223e4a0 [ 325.499990] ffff881ff2fa79a8 ffffffff815424ee ffff883ff223e49c 000000015cba0744 [ 325.507460] 00000000f2fa7978 0000000000000000 ffff881ff2fa79a8 ffff883ff223e4a0 [ 325.514956] Call Trace: [ 325.517412] [<ffffffff815424ee>] gen_new_estimator+0x8e/0x230 [ 325.523250] [<ffffffff815427aa>] gen_replace_estimator+0x4a/0x60 [ 325.529349] [<ffffffff815718ab>] tc_modify_qdisc+0x52b/0x590 [ 325.535117] [<ffffffff8155edd0>] rtnetlink_rcv_msg+0xa0/0x240 [ 325.540963] [<ffffffff8155ed30>] ? __rtnl_unlock+0x20/0x20 [ 325.546532] [<ffffffff8157f811>] netlink_rcv_skb+0xb1/0xc0 [ 325.552145] [<ffffffff8155b355>] rtnetlink_rcv+0x25/0x40 [ 325.557558] [<ffffffff8157f0d8>] netlink_unicast+0x168/0x220 [ 325.563317] [<ffffffff8157f47c>] netlink_sendmsg+0x2ec/0x3e0 Lets play safe and not use an union : percpu 'pointers' are mostly read anyway, and we have typically few qdiscs per host. Signed-off-by:
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Haiyang Zhang authored
The existing code frees the skb in EAGAIN case, in which the skb will be retried from upper layer and used again. Also, the existing code doesn't free send buffer slot in error case, because there is no completion message for unsent packets. This patch fixes these problems. (Please also include this patch for stable trees. Thanks!) Signed-off-by:
Haiyang Zhang <haiyangz@microsoft.com> Reviewed-by:
K. Y. Srinivasan <kys@microsoft.com> Signed-off-by:
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- 31 Jan, 2015 8 commits
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Iyappan Subramanian authored
This patch fixes the following kernel crash, WARNING: CPU: 2 PID: 0 at net/ipv4/tcp_input.c:3079 tcp_clean_rtx_queue+0x658/0x80c() Call trace: [<fffffe0000096b7c>] dump_backtrace+0x0/0x184 [<fffffe0000096d10>] show_stack+0x10/0x1c [<fffffe0000685ea0>] dump_stack+0x74/0x98 [<fffffe00000b44e0>] warn_slowpath_common+0x88/0xb0 [<fffffe00000b461c>] warn_slowpath_null+0x14/0x20 [<fffffe00005b5c1c>] tcp_clean_rtx_queue+0x654/0x80c [<fffffe00005b6228>] tcp_ack+0x454/0x688 [<fffffe00005b6ca8>] tcp_rcv_established+0x4a4/0x62c [<fffffe00005bf4b4>] tcp_v4_do_rcv+0x16c/0x350 [<fffffe00005c225c>] tcp_v4_rcv+0x8e8/0x904 [<fffffe000059d470>] ip_local_deliver_finish+0x100/0x26c [<fffffe000059dad8>] ip_local_deliver+0xac/0xc4 [<fffffe000059d6c4>] ip_rcv_finish+0xe8/0x328 [<fffffe000059dd3c>] ip_rcv+0x24c/0x38c [<fffffe0000563950>] __netif_receive_skb_core+0x29c/0x7c8 [<fffffe0000563ea4>] __netif_receive_skb+0x28/0x7c [<fffffe0000563f54>] netif_receive_skb_internal+0x5c/0xe0 [<fffffe0000564810>] napi_gro_receive+0xb4/0x110 [<fffffe0000482a2c>] xgene_enet_process_ring+0x144/0x338 [<fffffe0000482d18>] xgene_enet_napi+0x1c/0x50 [<fffffe0000565454>] net_rx_action+0x154/0x228 [<fffffe00000b804c>] __do_softirq+0x110/0x28c [<fffffe00000b8424>] irq_exit+0x8c/0xc0 [<fffffe0000093898>] handle_IRQ+0x44/0xa8 [<fffffe000009032c>] gic_handle_irq+0x38/0x7c [...] Software writes poison data into the descriptor bytes[15:8] and upon receiving the interrupt, if those bytes are overwritten by the hardware with the valid data, software also reads bytes[7:0] and executes receive/tx completion logic. If the CPU executes the above two reads in out of order fashion, then the bytes[7:0] will have older data and causing the kernel panic. We have to force the order of the reads and thus this patch introduces read memory barrier between these reads. Signed-off-by:
Iyappan Subramanian <isubramanian@apm.com> Signed-off-by:
Keyur Chudgar <kchudgar@apm.com> Signed-off-by:
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David S. Miller authored
Toshiaki Makita says: ==================== Fix checksum error when using stacked vlan When I was testing 802.1ad, I found several drivers don't take into account 802.1ad or multiple vlans when retrieving L3 (IP/IPv6) or L4 (TCP/UDP) protocol for checksum offload. It is mainly due to vlan_get_protocol(), which extracts ether type only when it is tagged with single 802.1Q. When 802.1ad is used or there are multiple vlans, it extracts vlan protocol and drivers cannot determine which L3/L4 protocol is used. Those drivers, most of which have IP_CSUM/IPV6_CSUM features, get L3/L4 header-offset by software, so it seems that their checksum offload works with multiple vlans if we can parse protocols correctly. (They know mac header length, and probably don't care about what is in it.) And another thing, some of Intel's drivers seem to use skb->protocol where vlan_get_protocol() is more suitable. I tested that at least igb/igbvf on I350 works with this patch set. Note: We can hand a double tagged packet with CHECKSUM_PARTIAL to a HW driver by creating a vlan device on a bridge device and enabling vlan_filtering of the bridge with 802.1ad protocol. ==================== Signed-off-by: -
Toshiaki Makita authored
When a skb has multiple vlans and it is CHECKSUM_PARTIAL, ixgbevf_tx_csum() fails to get the network protocol and checksum related descriptor fields are not configured correctly because skb->protocol doesn't show the L3 protocol in this case. Use first->protocol instead of skb->protocol to get the proper network protocol. Signed-off-by:
Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> Signed-off-by:
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Toshiaki Makita authored
When a skb has multiple vlans and it is CHECKSUM_PARTIAL, ixgbe_tx_csum() fails to get the network protocol and checksum related descriptor fields are not configured correctly because skb->protocol doesn't show the L3 protocol in this case. Use vlan_get_protocol() to get the proper network protocol. Signed-off-by:
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Toshiaki Makita authored
When a skb has multiple vlans and it is CHECKSUM_PARTIAL, igbvf_tx_csum() fails to get the network protocol and checksum related descriptor fields are not configured correctly because skb->protocol doesn't show the L3 protocol in this case. Use vlan_get_protocol() to get the proper network protocol. Signed-off-by:
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Toshiaki Makita authored
vlan_get_protocol() could not get network protocol if a skb has a 802.1ad vlan tag or multiple vlans, which caused incorrect checksum calculation in several drivers. Fix vlan_get_protocol() to retrieve network protocol instead of incorrect vlan protocol. As the logic is the same as skb_network_protocol(), create a common helper function __vlan_get_protocol() and call it from existing functions. Signed-off-by:
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Saran Maruti Ramanara authored
When making use of RFC5061, section 4.2.4. for setting the primary IP address, we're passing a wrong parameter header to param_type2af(), resulting always in NULL being returned. At this point, param.p points to a sctp_addip_param struct, containing a sctp_paramhdr (type = 0xc004, length = var), and crr_id as a correlation id. Followed by that, as also presented in RFC5061 section 4.2.4., comes the actual sctp_addr_param, which also contains a sctp_paramhdr, but this time with the correct type SCTP_PARAM_IPV{4,6}_ADDRESS that param_type2af() can make use of. Since we already hold a pointer to addr_param from previous line, just reuse it for param_type2af(). Fixes: d6de3097 ("[SCTP]: Add the handling of "Set Primary IP Address" parameter to INIT") Signed-off-by:Saran Maruti Ramanara <saran.neti@telus.com> Signed-off-by:
Daniel Borkmann <dborkman@redhat.com> Acked-by:
Vlad Yasevich <vyasevich@gmail.com> Acked-by:
Neil Horman <nhorman@tuxdriver.com> Signed-off-by:
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Pablo Neira authored
The subscription bitmask passed via struct sockaddr_nl is converted to the group number when calling the netlink_bind() and netlink_unbind() callbacks. The conversion is however incorrect since bitmask (1 << 0) needs to be mapped to group number 1. Note that you cannot specify the group number 0 (usually known as _NONE) from setsockopt() using NETLINK_ADD_MEMBERSHIP since this is rejected through -EINVAL. This problem became noticeable since 97840cb6 ("netfilter: nfnetlink: fix insufficient validation in nfnetlink_bind") when binding to bitmask (1 << 0) in ctnetlink. Reported-by:
Andre Tomt <andre@tomt.net> Reported-by:
Ivan Delalande <colona@arista.com> Signed-off-by:
Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by:
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- 30 Jan, 2015 2 commits
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Pablo Neira Ayuso authored
Release statistics and module refcount on memory allocation problems. Signed-off-by: -
Julian Anastasov authored
commit f5a41847 ("ipvs: move ip_route_me_harder for ICMP") from 2.6.37 introduced ip_route_me_harder() call for responses to local clients, so that we can provide valid rt_src after SNAT. It was used by TCP to provide valid daddr for ip_send_reply(). After commit 0a5ebb80 ("ipv4: Pass explicit daddr arg to ip_send_reply()." from 3.0 this rerouting is not needed anymore and should be avoided, especially in LOCAL_IN. Fixes 3.12.33 crash in xfrm reported by Florian Wiessner: "3.12.33 - BUG xfrm_selector_match+0x25/0x2f6" Reported-by:
Smart Weblications GmbH - Florian Wiessner <f.wiessner@smart-weblications.de> Tested-by:
Julian Anastasov <ja@ssi.bg> Signed-off-by:
Simon Horman <horms@verge.net.au>
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- 29 Jan, 2015 20 commits
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Li Wei authored
RFC 1191 said, "a host MUST not increase its estimate of the Path MTU in response to the contents of a Datagram Too Big message." Signed-off-by:
Li Wei <lw@cn.fujitsu.com> Signed-off-by:
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David S. Miller authored
Arnd Bergmann says: ==================== net: driver fixes from arm randconfig builds These four patches are fallout from test builds on ARM. I have a few more of them in my backlog but have not yet confirmed them to still be valid. The first three patches are about incomplete dependencies on old drivers. One could backport them to the beginning of time in theory, but there is little value since nobody would run into these problems. The final patch is one I had submitted before together with the respective pcmcia patch but forgot to follow up on that. It's still a valid but relatively theoretical bug, because the previous behavior of the driver was just as broken as what we have in mainline. ==================== Signed-off-by: -
Arnd Bergmann authored
A recent patch tried to work around a valid warning for the use of a deprecated interface by blindly changing from the old pcmcia_request_exclusive_irq() interface to pcmcia_request_irq(). This driver has an interrupt handler that is not currently aware of shared interrupts, but can be easily converted to be. At the moment, the driver reads the interrupt status register repeatedly until it contains only zeroes in the interesting bits, and handles each bit individually. This patch adds the missing part of returning IRQ_NONE in case none of the bits are set to start with, so we can move on to the next interrupt source. Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Fixes: 5f5316fc ("am2150: Update nmclan_cs.c to use update PCMCIA API") Signed-off-by:
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Arnd Bergmann authored
The ni65 and lance ethernet drivers manually program the ISA DMA controller that is only available on x86 PCs and a few compatible systems. Trying to build it on ARM results in this error: ni65.c: In function 'ni65_probe1': ni65.c:496:62: error: 'DMA1_STAT_REG' undeclared (first use in this function) ((inb(DMA1_STAT_REG) >> 4) & 0x0f) ^ ni65.c:496:62: note: each undeclared identifier is reported only once for each function it appears in ni65.c:497:63: error: 'DMA2_STAT_REG' undeclared (first use in this function) | (inb(DMA2_STAT_REG) & 0xf0); The DMA1_STAT_REG and DMA2_STAT_REG registers are only defined for alpha, mips, parisc, powerpc and x86, although it is not clear which subarchitectures actually have them at the correct location. This patch for now just disables it for ARM, to avoid randconfig build errors. We could also decide to limit it to the set of architectures on which it does compile, but that might look more deliberate than guessing based on where the drivers build. Signed-off-by: -
Arnd Bergmann authored
The cosa driver is rather outdated and does not get built on most platforms because it requires the ISA_DMA_API symbol. However there are some ARM platforms that have ISA_DMA_API but no virt_to_bus, and they get this build error when enabling the ltpc driver. drivers/net/wan/cosa.c: In function 'tx_interrupt': drivers/net/wan/cosa.c:1768:3: error: implicit declaration of function 'virt_to_bus' unsigned long addr = virt_to_bus(cosa->txbuf); ^ The same problem exists for the Hostess SV-11 and Sealevel Systems 4021 drivers. This adds another dependency in Kconfig to avoid that configuration. Signed-off-by:
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Arnd Bergmann authored
The cs89x0 driver can either be built as an ISA driver or a platform driver, the choice is controlled by the CS89x0_PLATFORM Kconfig symbol. Building the ISA driver on a system that does not have a way to map I/O ports fails with this error: drivers/built-in.o: In function `cs89x0_ioport_probe.constprop.1': :(.init.text+0x4794): undefined reference to `ioport_map' :(.init.text+0x4830): undefined reference to `ioport_unmap' This changes the Kconfig logic to take that option away and always force building the platform variant of this driver if CONFIG_HAS_IOPORT_MAP is not set. This is the only correct choice in this case, and it avoids the build error. Signed-off-by:
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Florian Westphal authored
When we've run out of space in the output buffer to store more data, we will call zlib_deflate with a NULL output buffer until we've consumed remaining input. When this happens, olen contains the size the output buffer would have consumed iff we'd have had enough room. This can later cause skb_over_panic when ppp_generic skb_put()s the returned length. Reported-by:
Iain Douglas <centos@1n6.org.uk> Signed-off-by:
Florian Westphal <fw@strlen.de> Signed-off-by:
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David S. Miller authored
Nicolas Dichtel says: ==================== netns: audit netdevice creation with IFLA_NET_NS_[PID|FD] When one of these attributes is set, the netdevice is created into the netns pointed by IFLA_NET_NS_[PID|FD] (see the call to rtnl_create_link() in rtnl_newlink()). Let's call this netns the dest_net. After this creation, if the newlink handler exists, it is called with a netns argument that points to the netns where the netlink message has been received (called src_net in the code) which is the link netns. Hence, with one of these attributes, it's possible to create a x-netns netdevice. Here is the result of my code review: - all ip tunnels (sit, ipip, ip6_tunnels, gre[tap][v6], ip_vti[6]) does not really allows to use this feature: the netdevice is created in the dest_net and the src_net is completely ignored in the newlink handler. - VLAN properly handles this x-netns creation. - bridge ignores src_net, which seems fine (NETIF_F_NETNS_LOCAL is set). - CAIF subsystem is not clear for me (I don't know how it works), but it seems to wrongly use src_net. Patch #1 tries to fix this, but it was done only by code review (and only compile-tested), so please carefully review it. I may miss something. - HSR subsystem uses src_net to parse IFLA_HSR_SLAVE[1|2], but the netdevice has the flag NETIF_F_NETNS_LOCAL, so the question is: does this netdevice really supports x-netns? If not, the newlink handler should use the dest_net instead of src_net, I can provide the patch. - ieee802154 uses also src_net and does not have NETIF_F_NETNS_LOCAL. Same question: does this netdevice really supports x-netns? - bonding ignores src_net and flag NETIF_F_NETNS_LOCAL is set, ie x-netns is not supported. Fine. - CAN does not support rtnl/newlink, ok. - ipvlan uses src_net and does not have NETIF_F_NETNS_LOCAL. After looking at the code, it seems that this drivers support x-netns. Am I right? - macvlan/macvtap uses src_net and seems to have x-netns support. - team ignores src_net and has the flag NETIF_F_NETNS_LOCAL, ie x-netns is not supported. Ok. - veth uses src_net and have x-netns support ;-) Ok. - VXLAN didn't properly handle this. The link netns (vxlan->net) is the src_net and not dest_net (see patch #2). Note that it was already possible to create a x-netns vxlan before the commit f01ec1c0 ("vxlan: add x-netns support") but the nedevice remains broken. To summarize: - CAIF patch must be carefully reviewed - for HSR, ieee802154, ipvlan: is x-netns supported? ==================== Signed-off-by:
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Nicolas Dichtel authored
Rename the netns to src_net to avoid confusion with the netns where the interface stands. The user may specify IFLA_NET_NS_[PID|FD] to create a x-netns netndevice: IFLA_NET_NS_[PID|FD] points to the netns where the netdevice stands and src_net to the link netns. Note that before commit f01ec1c0 ("vxlan: add x-netns support"), it was possible to create a x-netns vxlan netdevice, but the netdevice was not operational. Fixes: f01ec1c0 ("vxlan: add x-netns support") Signed-off-by:
Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by:
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Nicolas Dichtel authored
src_net points to the netns where the netlink message has been received. This netns may be different from the netns where the interface is created (because the user may add IFLA_NET_NS_[PID|FD]). In this case, src_net is the link netns. It seems wrong to override the netns in the newlink() handler because if it was not already src_net, it means that the user explicitly asks to create the netdevice in another netns. CC: Sjur Brændeland <sjur.brandeland@stericsson.com> CC: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no> Fixes: 8391c4aa ("caif: Bugfixes in CAIF netdevice for close and flow control") Fixes: c4125400 ("caif-hsi: Add rtnl support") Signed-off-by:
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karl beldan authored
Fixed commit added from64to32 under _#ifndef do_csum_ but used it under _#ifndef csum_tcpudp_nofold_, breaking some builds (Fengguang's robot reported TILEGX's). Move from64to32 under the latter. Fixes: 150ae0e9 ("lib/checksum.c: fix carry in csum_tcpudp_nofold") Reported-by:
kbuild test robot <fengguang.wu@intel.com> Signed-off-by:
Karl Beldan <karl.beldan@rivierawaves.com> Cc: Eric Dumazet <edumazet@google.com> Cc: David S. Miller <davem@davemloft.net> Signed-off-by:
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Eric Dumazet authored
When I added sk_pacing_rate field, I forgot to initialize its value in the per cpu unicast_sock used in ip_send_unicast_reply() This means that for sch_fq users, RST packets, or ACK packets sent on behalf of TIME_WAIT sockets might be sent to slowly or even dropped once we reach the per flow limit. Signed-off-by:
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karl beldan authored
The carry from the 64->32bits folding was dropped, e.g with: saddr=0xFFFFFFFF daddr=0xFF0000FF len=0xFFFF proto=0 sum=1, csum_tcpudp_nofold returned 0 instead of 1. Signed-off-by:
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Roopa Prabhu authored
Reported in: https://bugzilla.kernel.org/show_bug.cgi?id=92081 This patch avoids calling rtnl_notify if the device ndo_bridge_getlink handler does not return any bytes in the skb. Alternately, the skb->len check can be moved inside rtnl_notify. For the bridge vlan case described in 92081, there is also a fix needed in bridge driver to generate a proper notification. Will fix that in subsequent patch. v2: rebase patch on net tree Signed-off-by:
Roopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by:
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David S. Miller authored
Neal Cardwell says: ==================== fix stretch ACK bugs in TCP CUBIC and Reno This patch series fixes the TCP CUBIC and Reno congestion control modules to properly handle stretch ACKs in their respective additive increase modes, and in the transitions from slow start to additive increase. This finishes the project started by commit 9f9843a7 ("tcp: properly handle stretch acks in slow start"), which fixed behavior for TCP congestion control when handling stretch ACKs in slow start mode. Motivation: In the Jan 2015 netdev thread 'BW regression after "tcp: refine TSO autosizing"', Eyal Perry documented a regression that Eric Dumazet determined was caused by improper handling of TCP stretch ACKs. Background: LRO, GRO, delayed ACKs, and middleboxes can cause "stretch ACKs" that cover more than the RFC-specified maximum of 2 packets. These stretch ACKs can cause serious performance shortfalls in common congestion control algorithms, like Reno and CUBIC, which were designed and tuned years ago with receiver hosts that were not using LRO or GRO, and were instead ACKing every other packet. Testing: at Google we have been using this approach for handling stretch ACKs for CUBIC datacenter and Internet traffic for several years, with good results. v2: * fixed return type of tcp_slow_start() to be u32 instead of int ==================== Signed-off-by:
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Neal Cardwell authored
This patch fixes a bug in CUBIC that causes cwnd to increase slightly too slowly when multiple ACKs arrive in the same jiffy. If cwnd is supposed to increase at a rate of more than once per jiffy, then CUBIC was sometimes too slow. Because the bic_target is calculated for a future point in time, calculated with time in jiffies, the cwnd can increase over the course of the jiffy while the bic_target calculated as the proper CUBIC cwnd at time t=tcp_time_stamp+rtt does not increase, because tcp_time_stamp only increases on jiffy tick boundaries. So since the cnt is set to: ca->cnt = cwnd / (bic_target - cwnd); as cwnd increases but bic_target does not increase due to jiffy granularity, the cnt becomes too large, causing cwnd to increase too slowly. For example: - suppose at the beginning of a jiffy, cwnd=40, bic_target=44 - so CUBIC sets: ca->cnt = cwnd / (bic_target - cwnd) = 40 / (44 - 40) = 40/4 = 10 - suppose we get 10 acks, each for 1 segment, so tcp_cong_avoid_ai() increases cwnd to 41 - so CUBIC sets: ca->cnt = cwnd / (bic_target - cwnd) = 41 / (44 - 41) = 41 / 3 = 13 So now CUBIC will wait for 13 packets to be ACKed before increasing cwnd to 42, insted of 10 as it should. The fix is to avoid adjusting the slope (determined by ca->cnt) multiple times within a jiffy, and instead skip to compute the Reno cwnd, the "TCP friendliness" code path. Reported-by:
Eyal Perry <eyalpe@mellanox.com> Signed-off-by:
Neal Cardwell <ncardwell@google.com> Signed-off-by:
Yuchung Cheng <ycheng@google.com> Signed-off-by:
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Neal Cardwell authored
Change CUBIC to properly handle stretch ACKs in additive increase mode by passing in the count of ACKed packets to tcp_cong_avoid_ai(). In addition, because we are now precisely accounting for stretch ACKs, including delayed ACKs, we can now remove the delayed ACK tracking and estimation code that tracked recent delayed ACK behavior in ca->delayed_ack. Reported-by:
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Neal Cardwell authored
Change Reno to properly handle stretch ACKs in additive increase mode by passing in the count of ACKed packets to tcp_cong_avoid_ai(). In addition, if snd_cwnd crosses snd_ssthresh during slow start processing, and we then exit slow start mode, we need to carry over any remaining "credit" for packets ACKed and apply that to additive increase by passing this remaining "acked" count to tcp_cong_avoid_ai(). Reported-by:
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Neal Cardwell authored
tcp_cong_avoid_ai() was too timid (snd_cwnd increased too slowly) on "stretch ACKs" -- cases where the receiver ACKed more than 1 packet in a single ACK. For example, suppose w is 10 and we get a stretch ACK for 20 packets, so acked is 20. We ought to increase snd_cwnd by 2 (since acked/w = 20/10 = 2), but instead we were only increasing cwnd by 1. This patch fixes that behavior. Reported-by:
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Neal Cardwell authored
LRO, GRO, delayed ACKs, and middleboxes can cause "stretch ACKs" that cover more than the RFC-specified maximum of 2 packets. These stretch ACKs can cause serious performance shortfalls in common congestion control algorithms that were designed and tuned years ago with receiver hosts that were not using LRO or GRO, and were instead politely ACKing every other packet. This patch series fixes Reno and CUBIC to handle stretch ACKs. This patch prepares for the upcoming stretch ACK bug fix patches. It adds an "acked" parameter to tcp_cong_avoid_ai() to allow for future fixes to tcp_cong_avoid_ai() to correctly handle stretch ACKs, and changes all congestion control algorithms to pass in 1 for the ACKed count. It also changes tcp_slow_start() to return the number of packet ACK "credits" that were not processed in slow start mode, and can be processed by the congestion control module in additive increase mode. In future patches we will fix tcp_cong_avoid_ai() to handle stretch ACKs, and fix Reno and CUBIC handling of stretch ACKs in slow start and additive increase mode. Reported-by:
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