- 26 Nov, 2021 3 commits
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Jakub Kicinski authored
Test broken records. Signed-off-by:Jakub Kicinski <kuba@kernel.org>
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Jakub Kicinski authored
Add helpers for sending and receiving special record types. Signed-off-by: -
Jakub Kicinski authored
We have the same code 3 times, about to add a fourth copy. Signed-off-by:
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- 25 Nov, 2021 12 commits
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Dylan Hung authored
The issue happened randomly in runtime. The message "Link is Down" is popped but soon it recovered to "Link is Up". The "Link is Down" results from the incorrect read data for reading the PHY register via MDIO bus. The correct sequence for reading the data shall be: 1. fire the command 2. wait for command done (this step was missing) 3. wait for data idle 4. read data from data register Cc: stable@vger.kernel.org Fixes: f160e994 ("net: phy: Add mdio-aspeed") Reviewed-by:
Joel Stanley <joel@jms.id.au> Signed-off-by:
Dylan Hung <dylan_hung@aspeedtech.com> Reviewed-by:
Andrew Lunn <andrew@lunn.ch> Reviewed-by:
Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Link: https://lore.kernel.org/r/20211125024432.15809-1-dylan_hung@aspeedtech.comSigned-off-by:
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Jesse Brandeburg authored
Oleksandr brought a bug report where netpoll causes trace messages in the log on igb. Danielle brought this back up as still occurring, so we'll try again. [22038.710800] ------------[ cut here ]------------ [22038.710801] igb_poll+0x0/0x1440 [igb] exceeded budget in poll [22038.710802] WARNING: CPU: 12 PID: 40362 at net/core/netpoll.c:155 netpoll_poll_dev+0x18a/0x1a0 As Alex suggested, change the driver to return work_done at the exit of napi_poll, which should be safe to do in this driver because it is not polling multiple queues in this single napi context (multiple queues attached to one MSI-X vector). Several other drivers contain the same simple sequence, so I hope this will not create new problems. Fixes: 16eb8815 ("igb: Refactor clean_rx_irq to reduce overhead and improve performance") Reported-by:
Oleksandr Natalenko <oleksandr@natalenko.name> Reported-by:
Danielle Ratson <danieller@nvidia.com> Suggested-by:
Alexander Duyck <alexander.duyck@gmail.com> Signed-off-by:
Jesse Brandeburg <jesse.brandeburg@intel.com> Tested-by:
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Jakub Kicinski authored
Karsten Graul says: ==================== net/smc: fixes 2021-11-24 Patch 1 from DaXing fixes a possible loop in smc_listen(). Patch 2 prevents a NULL pointer dereferencing while iterating over the lower network devices. ==================== Link: https://lore.kernel.org/r/20211124123238.471429-1-kgraul@linux.ibm.comSigned-off-by:
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Guo DaXing authored
The kernel_listen function in smc_listen will fail when all the available ports are occupied. At this point smc->clcsock->sk->sk_data_ready has been changed to smc_clcsock_data_ready. When we call smc_listen again, now both smc->clcsock->sk->sk_data_ready and smc->clcsk_data_ready point to the smc_clcsock_data_ready function. The smc_clcsock_data_ready() function calls lsmc->clcsk_data_ready which now points to itself resulting in an infinite loop. This patch restores smc->clcsock->sk->sk_data_ready with the old value. Fixes: a60a2b1e ("net/smc: reduce active tcp_listen workers") Signed-off-by:
Guo DaXing <guodaxing@huawei.com> Acked-by:
Tony Lu <tonylu@linux.alibaba.com> Signed-off-by:
Karsten Graul <kgraul@linux.ibm.com> Signed-off-by:
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Karsten Graul authored
Coverity reports a possible NULL dereferencing problem: in smc_vlan_by_tcpsk(): 6. returned_null: netdev_lower_get_next returns NULL (checked 29 out of 30 times). 7. var_assigned: Assigning: ndev = NULL return value from netdev_lower_get_next. 1623 ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower); CID 1468509 (#1 of 1): Dereference null return value (NULL_RETURNS) 8. dereference: Dereferencing a pointer that might be NULL ndev when calling is_vlan_dev. 1624 if (is_vlan_dev(ndev)) { Remove the manual implementation and use netdev_walk_all_lower_dev() to iterate over the lower devices. While on it remove an obsolete function parameter comment. Fixes: cb9d43f6 ("net/smc: determine vlan_id of stacked net_device") Suggested-by:Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by:
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Jakub Kicinski authored
Marek Behún says: ==================== phylink resolve fixes With information from me and my nagging, Russell has produced two fixes for phylink, which add code that triggers another phylink_resolve() from phylink_resolve(), if certain conditions are met: interface is being changed or link is down and previous link was up These are needed because sometimes the PCS callbacks may provide stale values if link / speed / ... ==================== Link: https://lore.kernel.org/r/20211123154403.32051-1-kabel@kernel.orgSigned-off-by:
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Russell King (Oracle) authored
On mv88e6xxx 1G/2.5G PCS, the SerDes register 4.2001.2 has the following description: This register bit indicates when link was lost since the last read. For the current link status, read this register back-to-back. Thus to get current link state, we need to read the register twice. But doing that in the link change interrupt handler would lead to potentially ignoring link down events, which we really want to avoid. Thus this needs to be solved in phylink's resolve, by retriggering another resolve in the event when PCS reports link down and previous link was up, and by re-reading PCS state if the previous link was down. The wrong value is read when phylink requests change from sgmii to 2500base-x mode, and link won't come up. This fixes the bug. Fixes: 9525ae83 ("phylink: add phylink infrastructure") Signed-off-by:
Marek Behún <kabel@kernel.org> Signed-off-by:
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Russell King (Oracle) authored
On PHY state change the phylink_resolve() function can read stale information from the MAC and report incorrect link speed and duplex to the kernel message log. Example with a Marvell 88X3310 PHY connected to a SerDes port on Marvell 88E6393X switch: - PHY driver triggers state change due to PHY interface mode being changed from 10gbase-r to 2500base-x due to copper change in speed from 10Gbps to 2.5Gbps, but the PHY itself either hasn't yet changed its interface to the host, or the interrupt about loss of SerDes link hadn't arrived yet (there can be a delay of several milliseconds for this), so we still think that the 10gbase-r mode is up - phylink_resolve() - phylink_mac_pcs_get_state() - this fills in speed=10g link=up - interface mode is updated to 2500base-x but speed is left at 10Gbps - phylink_major_config() - interface is changed to 2500base-x - phylink_link_up() - mv88e6xxx_mac_link_up() - .port_set_speed_duplex() - speed is set to 10Gbps - reports "Link is Up - 10Gbps/Full" to dmesg Afterwards when the interrupt finally arrives for mv88e6xxx, another resolve is forced in which we get the correct speed from phylink_mac_pcs_get_state(), but since the interface is not being changed anymore, we don't call phylink_major_config() but only phylink_mac_config(), which does not set speed/duplex anymore. To fix this, we need to force the link down and trigger another resolve on PHY interface change event. Fixes: 9525ae83 ("phylink: add phylink infrastructure") Signed-off-by: -
Heiner Kallweit authored
Usage of phy_ethtool_get_link_ksettings() in the link status change handler isn't needed, and in combination with the referenced change it results in a deadlock. Simply remove the call and replace it with direct access to phydev->speed. The duplex argument of lan743x_phy_update_flowcontrol() isn't used and can be removed. Fixes: c10a485c ("phy: phy_ethtool_ksettings_get: Lock the phy for consistency") Reported-by:
Alessandro B Maurici <abmaurici@gmail.com> Tested-by:
Heiner Kallweit <hkallweit1@gmail.com> Reviewed-by:
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Eric Dumazet authored
While testing BIG TCP patch series, I was expecting that TCP_RR workloads with 80KB requests/answers would send one 80KB TSO packet, then being received as a single GRO packet. It turns out this was not happening, and the root cause was that cubic Hystart ACK train was triggering after a few (2 or 3) rounds of RPC. Hystart was wrongly setting CWND/SSTHRESH to 30, while my RPC needed a budget of ~20 segments. Ideally these TCP_RR flows should not exit slow start. Cubic Hystart should reset itself at each round, instead of assuming every TCP flow is a bulk one. Note that even after this patch, Hystart can still trigger, depending on scheduling artifacts, but at a higher CWND/SSTHRESH threshold, keeping optimal TSO packet sizes. Tested: ip link set dev eth0 gro_ipv6_max_size 131072 gso_ipv6_max_size 131072 nstat -n; netperf -H ... -t TCP_RR -l 5 -- -r 80000,80000 -K cubic; nstat|egrep "Ip6InReceives|Hystart|Ip6OutRequests" Before: 8605 Ip6InReceives 87541 0.0 Ip6OutRequests 129496 0.0 TcpExtTCPHystartTrainDetect 1 0.0 TcpExtTCPHystartTrainCwnd 30 0.0 After: 8760 Ip6InReceives 88514 0.0 Ip6OutRequests 87975 0.0 Fixes: ae27e98a ("[TCP] CUBIC v2.3") Co-developed-by:
Neal Cardwell <ncardwell@google.com> Signed-off-by:
Eric Dumazet <edumazet@google.com> Cc: Stephen Hemminger <stephen@networkplumber.org> Cc: Yuchung Cheng <ycheng@google.com> Cc: Soheil Hassas Yeganeh <soheil@google.com> Link: https://lore.kernel.org/r/20211123202535.1843771-1-eric.dumazet@gmail.comSigned-off-by:
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Florian Fainelli authored
Update the B53 Ethernet switch section to contain drivers/net/dsa/bcm_sf2*. Reported-by:
Russell King (Oracle) <linux@armlinux.org.uk> Signed-off-by:
Florian Fainelli <f.fainelli@gmail.com> Acked-by:
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Jakub Kicinski authored
Merge tag 'ieee802154-for-net-2021-11-24' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan Stefan Schmidt says: ==================== pull-request: ieee802154 for net 2021-11-24 A fix from Alexander which has been brought up various times found by automated checkers. Make sure values are in u32 range. * tag 'ieee802154-for-net-2021-11-24' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan: net: ieee802154: handle iftypes as u32 ==================== Link: https://lore.kernel.org/r/20211124150934.3670248-1-stefan@datenfreihafen.orgSigned-off-by:
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- 24 Nov, 2021 4 commits
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Kumar Thangavel authored
Update NC-SI command handler (both standard and OEM) to take into account of payload paddings in allocating skb (in case of payload size is not 32-bit aligned). The checksum field follows payload field, without taking payload padding into account can cause checksum being truncated, leading to dropped packets. Fixes: fb4ee675 ("net/ncsi: Add NCSI OEM command support") Signed-off-by:
Kumar Thangavel <thangavel.k@hcl.com> Acked-by:
Samuel Mendoza-Jonas <sam@mendozajonas.com> Reviewed-by:
Paul Menzel <pmenzel@molgen.mpg.de> Signed-off-by:
David S. Miller <davem@davemloft.net>
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James Prestwood authored
This was previously added in selftests but never added to the Makefile Signed-off-by:
James Prestwood <prestwoj@gmail.com> Link: https://lore.kernel.org/r/20211122171806.3529401-1-prestwoj@gmail.comSigned-off-by:
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Jamal Hadi Salim authored
Signed-off-by:
Jamal Hadi Salim <jhs@mojatatu.com> Acked-by:
Cong Wang <cong.wang@bytedance.com> Link: https://lore.kernel.org/r/20211122144252.25156-1-jhs@emojatatu.comSigned-off-by:
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Eric Dumazet authored
This file has not been updated for a while. Sync it before BIG TCP patch series. Signed-off-by:
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- 23 Nov, 2021 18 commits
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Marek Behún authored
Currently mvpp2_xdp_setup won't allow attaching XDP program if mtu > ETH_DATA_LEN (1500). The mvpp2_change_mtu on the other hand checks whether MVPP2_RX_PKT_SIZE(mtu) > MVPP2_BM_LONG_PKT_SIZE. These two checks are semantically different. Moreover this limit can be increased to MVPP2_MAX_RX_BUF_SIZE, since in mvpp2_rx we have xdp.data = data + MVPP2_MH_SIZE + MVPP2_SKB_HEADROOM; xdp.frame_sz = PAGE_SIZE; Change the checks to check whether mtu > MVPP2_MAX_RX_BUF_SIZE Fixes: 07dd0a7a ("mvpp2: add basic XDP support") Signed-off-by:
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Alex Elder authored
Calling ipa_cmd_pipeline_clear() after stopping the channel underlying the AP<-modem RX endpoint can lead to a deadlock. This occurs in the ->runtime_suspend device power operation for the IPA driver. While this callback is in progress, any other requests for power will block until the callback returns. Stopping the AP<-modem RX channel does not prevent the modem from sending another packet to this endpoint. If a packet arrives for an RX channel when the channel is stopped, an SUSPEND IPA interrupt condition will be pending. Handling an IPA interrupt requires power, so ipa_isr_thread() calls pm_runtime_get_sync() first thing. The problem occurs because a "pipeline clear" command will not complete while such a SUSPEND interrupt condition exists. So the SUSPEND IPA interrupt handler won't proceed until it gets power; that won't happen until the ->runtime_suspend callback (and its "pipeline clear" command) completes; and that can't happen while the SUSPEND interrupt condition exists. It turns out that in this case there is no need to use the "pipeline clear" command. There are scenarios in which clearing the pipeline is required while suspending, but those are not (yet) supported upstream. So a simple fix, avoiding the potential deadlock, is to stop calling ipa_cmd_pipeline_clear() in ipa_endpoint_suspend(). This removes the only user of ipa_cmd_pipeline_clear(), so get rid of that function. It can be restored again whenever it's needed. This is basically a manual revert along with an explanation for commit 6cb63ea6 ("net: ipa: introduce ipa_cmd_tag_process()"). Fixes: 6cb63ea6 ("net: ipa: introduce ipa_cmd_tag_process()") Signed-off-by:
Alex Elder <elder@linaro.org> Signed-off-by:
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Martyn Welch authored
The smsc95xx driver is dropping phy speed settings and causing a stack trace at device unbind: [ 536.379147] smsc95xx 2-1:1.0 eth1: unregister 'smsc95xx' usb-ci_hdrc.2-1, smsc95xx USB 2.0 Ethernet [ 536.425029] ------------[ cut here ]------------ [ 536.429650] WARNING: CPU: 0 PID: 439 at fs/kernfs/dir.c:1535 kernfs_remove_by_name_ns+0xb8/0xc0 [ 536.438416] kernfs: can not remove 'attached_dev', no directory [ 536.444363] Modules linked in: xts dm_crypt dm_mod atmel_mxt_ts smsc95xx usbnet [ 536.451748] CPU: 0 PID: 439 Comm: sh Tainted: G W 5.15.0 #1 [ 536.458636] Hardware name: Freescale i.MX53 (Device Tree Support) [ 536.464735] Backtrace: [ 536.467190] [<80b1c904>] (dump_backtrace) from [<80b1cb48>] (show_stack+0x20/0x24) [ 536.474787] r7:000005ff r6:8035b294 r5:600f0013 r4:80d8af78 [ 536.480449] [<80b1cb28>] (show_stack) from [<80b1f764>] (dump_stack_lvl+0x48/0x54) [ 536.488035] [<80b1f71c>] (dump_stack_lvl) from [<80b1f788>] (dump_stack+0x18/0x1c) [ 536.495620] r5:00000009 r4:80d9b820 [ 536.499198] [<80b1f770>] (dump_stack) from [<80124fac>] (__warn+0xfc/0x114) [ 536.506187] [<80124eb0>] (__warn) from [<80b1d21c>] (warn_slowpath_fmt+0xa8/0xdc) [ 536.513688] r7:000005ff r6:80d9b820 r5:80d9b8e0 r4:83744000 [ 536.519349] [<80b1d178>] (warn_slowpath_fmt) from [<8035b294>] (kernfs_remove_by_name_ns+0xb8/0xc0) [ 536.528416] r9:00000001 r8:00000000 r7:824926dc r6:00000000 r5:80df6c2c r4:00000000 [ 536.536162] [<8035b1dc>] (kernfs_remove_by_name_ns) from [<80b1f56c>] (sysfs_remove_link+0x4c/0x50) [ 536.545225] r6:7f00f02c r5:80df6c2c r4:83306400 [ 536.549845] [<80b1f520>] (sysfs_remove_link) from [<806f9c8c>] (phy_detach+0xfc/0x11c) [ 536.557780] r5:82492000 r4:83306400 [ 536.561359] [<806f9b90>] (phy_detach) from [<806f9cf8>] (phy_disconnect+0x4c/0x58) [ 536.568943] r7:824926dc r6:7f00f02c r5:82492580 r4:83306400 [ 536.574604] [<806f9cac>] (phy_disconnect) from [<7f00a310>] (smsc95xx_disconnect_phy+0x30/0x38 [smsc95xx]) [ 536.584290] r5:82492580 r4:82492580 [ 536.587868] [<7f00a2e0>] (smsc95xx_disconnect_phy [smsc95xx]) from [<7f001570>] (usbnet_stop+0x70/0x1a0 [usbnet]) [ 536.598161] r5:82492580 r4:82492000 [ 536.601740] [<7f001500>] (usbnet_stop [usbnet]) from [<808baa70>] (__dev_close_many+0xb4/0x12c) [ 536.610466] r8:83744000 r7:00000000 r6:83744000 r5:83745b74 r4:82492000 [ 536.617170] [<808ba9bc>] (__dev_close_many) from [<808bab78>] (dev_close_many+0x90/0x120) [ 536.625365] r7:00000001 r6:83745b74 r5:83745b8c r4:82492000 [ 536.631026] [<808baae8>] (dev_close_many) from [<808bf408>] (unregister_netdevice_many+0x15c/0x704) [ 536.640094] r9:00000001 r8:81130b98 r7:83745b74 r6:83745bc4 r5:83745b8c r4:82492000 [ 536.647840] [<808bf2ac>] (unregister_netdevice_many) from [<808bfa50>] (unregister_netdevice_queue+0xa0/0xe8) [ 536.657775] r10:8112bcc0 r9:83306c00 r8:83306c80 r7:8291e420 r6:83744000 r5:00000000 [ 536.665608] r4:82492000 [ 536.668143] [<808bf9b0>] (unregister_netdevice_queue) from [<808bfac0>] (unregister_netdev+0x28/0x30) [ 536.677381] r6:7f01003c r5:82492000 r4:82492000 [ 536.682000] [<808bfa98>] (unregister_netdev) from [<7f000b40>] (usbnet_disconnect+0x64/0xdc [usbnet]) [ 536.691241] r5:82492000 r4:82492580 [ 536.694819] [<7f000adc>] (usbnet_disconnect [usbnet]) from [<8076b958>] (usb_unbind_interface+0x80/0x248) [ 536.704406] r5:7f01003c r4:83306c80 [ 536.707984] [<8076b8d8>] (usb_unbind_interface) from [<8061765c>] (device_release_driver_internal+0x1c4/0x1cc) [ 536.718005] r10:8112bcc0 r9:80dff1dc r8:83306c80 r7:83744000 r6:7f01003c r5:00000000 [ 536.725838] r4:8291e420 [ 536.728373] [<80617498>] (device_release_driver_internal) from [<80617684>] (device_release_driver+0x20/0x24) [ 536.738302] r7:83744000 r6:810d4f4c r5:8291e420 r4:8176ae30 [ 536.743963] [<80617664>] (device_release_driver) from [<806156cc>] (bus_remove_device+0xf0/0x148) [ 536.752858] [<806155dc>] (bus_remove_device) from [<80610018>] (device_del+0x198/0x41c) [ 536.760880] r7:83744000 r6:8116e2e4 r5:8291e464 r4:8291e420 [ 536.766542] [<8060fe80>] (device_del) from [<80768fe8>] (usb_disable_device+0xcc/0x1e0) [ 536.774576] r10:8112bcc0 r9:80dff1dc r8:00000001 r7:8112bc48 r6:8291e400 r5:00000001 [ 536.782410] r4:83306c00 [ 536.784945] [<80768f1c>] (usb_disable_device) from [<80769c30>] (usb_set_configuration+0x514/0x8dc) [ 536.794011] r10:00000000 r9:00000000 r8:832c3600 r7:00000004 r6:810d5688 r5:00000000 [ 536.801844] r4:83306c00 [ 536.804379] [<8076971c>] (usb_set_configuration) from [<80775fac>] (usb_generic_driver_disconnect+0x34/0x38) [ 536.814236] r10:832c3610 r9:83745ef8 r8:832c3600 r7:00000004 r6:810d5688 r5:83306c00 [ 536.822069] r4:83306c00 [ 536.824605] [<80775f78>] (usb_generic_driver_disconnect) from [<8076b850>] (usb_unbind_device+0x30/0x70) [ 536.834100] r5:83306c00 r4:810d5688 [ 536.837678] [<8076b820>] (usb_unbind_device) from [<8061765c>] (device_release_driver_internal+0x1c4/0x1cc) [ 536.847432] r5:822fb480 r4:83306c80 [ 536.851009] [<80617498>] (device_release_driver_internal) from [<806176a8>] (device_driver_detach+0x20/0x24) [ 536.860853] r7:00000004 r6:810d4f4c r5:810d5688 r4:83306c80 [ 536.866515] [<80617688>] (device_driver_detach) from [<80614d98>] (unbind_store+0x70/0xe4) [ 536.874793] [<80614d28>] (unbind_store) from [<80614118>] (drv_attr_store+0x30/0x3c) [ 536.882554] r7:00000000 r6:00000000 r5:83739200 r4:80614d28 [ 536.888217] [<806140e8>] (drv_attr_store) from [<8035cb68>] (sysfs_kf_write+0x48/0x54) [ 536.896154] r5:83739200 r4:806140e8 [ 536.899732] [<8035cb20>] (sysfs_kf_write) from [<8035be84>] (kernfs_fop_write_iter+0x11c/0x1d4) [ 536.908446] r5:83739200 r4:00000004 [ 536.912024] [<8035bd68>] (kernfs_fop_write_iter) from [<802b87fc>] (vfs_write+0x258/0x3e4) [ 536.920317] r10:00000000 r9:83745f58 r8:83744000 r7:00000000 r6:00000004 r5:00000000 [ 536.928151] r4:82adacc0 [ 536.930687] [<802b85a4>] (vfs_write) from [<802b8b0c>] (ksys_write+0x74/0xf4) [ 536.937842] r10:00000004 r9:007767a0 r8:83744000 r7:00000000 r6:00000000 r5:82adacc0 [ 536.945676] r4:82adacc0 [ 536.948213] [<802b8a98>] (ksys_write) from [<802b8ba4>] (sys_write+0x18/0x1c) [ 536.955367] r10:00000004 r9:83744000 r8:80100244 r7:00000004 r6:76f47b58 r5:76fc0350 [ 536.963200] r4:00000004 [ 536.965735] [<802b8b8c>] (sys_write) from [<80100060>] (ret_fast_syscall+0x0/0x48) [ 536.973320] Exception stack(0x83745fa8 to 0x83745ff0) [ 536.978383] 5fa0: 00000004 76fc0350 00000001 007767a0 00000004 00000000 [ 536.986569] 5fc0: 00000004 76fc0350 76f47b58 00000004 76f47c7c 76f48114 00000000 7e87991c [ 536.994753] 5fe0: 00000498 7e879908 76e6dce8 76eca2e8 [ 536.999922] ---[ end trace 9b835d809816b435 ]--- The driver should not be connecting and disconnecting the PHY when the device is opened and closed, it should be stopping and starting the PHY. The phy should be connected as part of binding and disconnected during unbinding. As this results in the PHY not being reset during open, link speed, etc. settings set prior to the link coming up are now not being lost. It is necessary for phy_stop() to only be called when the phydev still exists (resolving the above stack trace). When unbinding, ".unbind" will be called prior to ".stop", with phy_disconnect() already having called phy_stop() before the phydev becomes inaccessible. Signed-off-by:
Martyn Welch <martyn.welch@collabora.com> Cc: Steve Glendinning <steve.glendinning@shawell.net> Cc: UNGLinuxDriver@microchip.com Cc: "David S. Miller" <davem@davemloft.net> Cc: Jakub Kicinski <kuba@kernel.org> Cc: stable@kernel.org # v5.15 Signed-off-by:
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Zheyu Ma authored
During the process of driver probing, probe function should return < 0 for failure, otherwise kernel will treat value == 0 as success. Therefore, we should set err to -EINVAL when adapter->registered_device_map is NULL. Otherwise kernel will assume that driver has been successfully probed and will cause unexpected errors. Signed-off-by:
Zheyu Ma <zheyuma97@gmail.com> Signed-off-by:
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Heiner Kallweit authored
The original changes brakes MAC address assignment on older chip versions (see bug report [0]), and it brakes random MAC assignment. is_valid_ether_addr() requires that its argument is word-aligned. Add the missing alignment to array mac_addr. [0] https://bugzilla.kernel.org/show_bug.cgi?id=215087 Fixes: 1c5d09d5 ("ethernet: r8169: use eth_hw_addr_set()") Reported-by:
Richard Herbert <rherbert@sympatico.ca> Tested-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/net-queueDavid S. Miller authored
Tony Nguyen says: ==================== Intel Wired LAN Driver Updates 2021-11-22 Maciej Fijalkowski says: Here are the two fixes for issues around ethtool's set_channels() callback for ice driver. Both are related to XDP resources. First one corrects the size of vsi->txq_map that is used to track the usage of Tx resources and the second one prevents the wrong refcounting of bpf_prog. ==================== Signed-off-by: -
David S. Miller authored
Alex Elder says: ==================== net: ipa: prevent shutdown during setup The setup phase of the IPA driver occurs in one of two ways. Normally, it is done directly by the main driver probe function. But some systems (those having a "modem-init" DTS property) don't start setup until an SMP2P interrupt (sent by the modem) arrives. Because it isn't performed by the probe function, setup on "modem-init" systems could be underway at the time a driver remove (or shutdown) request arrives (or vice-versa). This situation can lead to hardware state not being cleaned up properly. This series addresses this problem by having the driver remove function disable the setup interrupt. A consequence of this is that setup will complete if it is underway when the remove function is called. So now, when removing the driver, setup: - will have already completed; - is underway, and will complete before proceeding; or - will not have begun (and will not occur). ==================== Signed-off-by: -
Alex Elder authored
The IPA setup_complete flag is set at the end of ipa_setup(), when the setup phase of initialization has completed successfully. This occurs as part of driver probe processing, or (if "modem-init" is specified in the DTS file) it is triggered by the "ipa-setup-ready" SMP2P interrupt generated by the modem. In the latter case, it's possible for driver shutdown (or remove) to begin while setup processing is underway, and this can't be allowed. The problem is that the setup_complete flag is not adequate to signal that setup is underway. If setup_complete is set, it will never be un-set, so that case is not a problem. But if setup_complete is false, there's a chance setup is underway. Because setup is triggered by an interrupt on a "modem-init" system, there is a simple way to ensure the value of setup_complete is safe to read. The threaded handler--if it is executing--will complete as part of a request to disable the "ipa-modem-ready" interrupt. This means that ipa_setup() (which is called from the handler) will run to completion if it was underway, or will never be called otherwise. The request to disable the "ipa-setup-ready" interrupt is currently made within ipa_modem_stop(). Instead, disable the interrupt outside that function in the two places it's called. In the case of ipa_remove(), this ensures the setup_complete flag is safe to read before we read it. Rename ipa_smp2p_disable() to be ipa_smp2p_irq_disable_setup(), to be more specific about its effect. Fixes: 530f9216 ("soc: qcom: ipa: AP/modem communications") Signed-off-by:
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Alex Elder authored
We currently maintain a "disabled" Boolean flag to determine whether the "ipa-setup-ready" SMP2P IRQ handler does anything. That flag must be accessed under protection of a mutex. Instead, disable the SMP2P interrupt when requested, which prevents the interrupt handler from ever being called. More importantly, it synchronizes a thread disabling the interrupt with the completion of the interrupt handler in case they run concurrently. Use the IPA setup_complete flag rather than the disabled flag in the handler to determine whether to ignore any interrupts arriving after the first. Rename the "disabled" flag to be "setup_disabled", to be specific about its purpose. Fixes: 530f9216 ("soc: qcom: ipa: AP/modem communications") Signed-off-by:
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David S. Miller authored
Ido Schimmel says: ==================== mlxsw: Two small fixes Patch #1 fixes a recent regression that prevents the driver from loading with old firmware versions. Patch #2 protects the driver from a NULL pointer dereference when working on top of a buggy firmware. This was never observed in an actual system, only on top of an emulator during development. ==================== Signed-off-by: -
Amit Cohen authored
When processing port up/down events generated by the device's firmware, the driver protects itself from events reported for non-existent local ports, but not the CPU port (local port 0), which exists, but lacks a netdev. This can result in a NULL pointer dereference when calling netif_carrier_{on,off}(). Fix this by bailing early when processing an event reported for the CPU port. Problem was only observed when running on top of a buggy emulator. Fixes: 28b1987e ("mlxsw: spectrum: Register CPU port with devlink") Signed-off-by:Amit Cohen <amcohen@nvidia.com> Signed-off-by:
Ido Schimmel <idosch@nvidia.com> Signed-off-by:
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Danielle Ratson authored
The driver fails to load with old firmware versions that cannot report the maximum number of RIF MAC profiles [1]. Fix this by defaulting to a maximum of a single profile in such situations, as multiple profiles are not supported by old firmware versions. [1] mlxsw_spectrum 0000:03:00.0: cannot register bus device mlxsw_spectrum: probe of 0000:03:00.0 failed with error -5 Fixes: 1c375ffb ("mlxsw: spectrum_router: Expose RIF MAC profiles to devlink resource") Signed-off-by:
Vadim Pasternak <vadimp@nvidia.com> Signed-off-by:
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David S. Miller authored
Tony Lu says: ==================== smc: Fixes for closing process and minor cleanup Patch 1 is a minor cleanup for local struct sock variables. Patch 2 ensures the active closing side enters TIME_WAIT. ==================== Signed-off-by: -
Tony Lu authored
The side that actively closed socket, it's clcsock doesn't enter TIME_WAIT state, but the passive side does it. It should show the same behavior as TCP sockets. Consider this, when client actively closes the socket, the clcsock in server enters TIME_WAIT state, which means the address is occupied and won't be reused before TIME_WAIT dismissing. If we restarted server, the service would be unavailable for a long time. To solve this issue, shutdown the clcsock in [A], perform the TCP active close progress first, before the passive closed side closing it. So that the actively closed side enters TIME_WAIT, not the passive one. Client | Server close() // client actively close | smc_release() | smc_close_active() // PEERCLOSEWAIT1 | smc_close_final() // abort or closed = 1| smc_cdc_get_slot_and_msg_send() | [A] | |smc_cdc_msg_recv_action() // ACTIVE | queue_work(smc_close_wq, &conn->close_work) | smc_close_passive_work() // PROCESSABORT or APPCLOSEWAIT1 | smc_close_passive_abort_received() // only in abort | |close() // server recv zero, close | smc_release() // PROCESSABORT or APPCLOSEWAIT1 | smc_close_active() | smc_close_abort() or smc_close_final() // CLOSED | smc_cdc_get_slot_and_msg_send() // abort or closed = 1 smc_cdc_msg_recv_action() | smc_clcsock_release() queue_work(smc_close_wq, &conn->close_work) | sock_release(tcp) // actively close clc, enter TIME_WAIT smc_close_passive_work() // PEERCLOSEWAIT1 | smc_conn_free() smc_close_passive_abort_received() // CLOSED| smc_conn_free() | smc_clcsock_release() | sock_release(tcp) // passive close clc | Link: https://www.spinics.net/lists/netdev/msg780407.html Fixes: b38d7324 ("smc: socket closing and linkgroup cleanup") Signed-off-by:Wen Gu <guwen@linux.alibaba.com> Signed-off-by:
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Tony Lu authored
There remains some variables to replace with local struct sock. So clean them up all. Fixes: 3163c507 ("net/smc: use local struct sock variables consistently") Signed-off-by:
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Nikolay Aleksandrov authored
When we try to add an IPv6 nexthop and IPv6 is not enabled (!CONFIG_IPV6) we'll hit a NULL pointer dereference[1] in the error path of nh_create_ipv6() due to calling ipv6_stub->fib6_nh_release. The bug has been present since the beginning of IPv6 nexthop gateway support. Commit 1aefd3de ("ipv6: Add fib6_nh_init and release to stubs") tells us that only fib6_nh_init has a dummy stub because fib6_nh_release should not be called if fib6_nh_init returns an error, but the commit below added a call to ipv6_stub->fib6_nh_release in its error path. To fix it return the dummy stub's -EAFNOSUPPORT error directly without calling ipv6_stub->fib6_nh_release in nh_create_ipv6()'s error path. [1] Output is a bit truncated, but it clearly shows the error. BUG: kernel NULL pointer dereference, address: 000000000000000000 #PF: supervisor instruction fetch in kernel modede #PF: error_code(0x0010) - not-present pagege PGD 0 P4D 0 Oops: 0010 [#1] PREEMPT SMP NOPTI CPU: 4 PID: 638 Comm: ip Kdump: loaded Not tainted 5.16.0-rc1+ #446 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/01/2014 RIP: 0010:0x0 Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. RSP: 0018:ffff888109f5b8f0 EFLAGS: 00010286^Ac RAX: 0000000000000000 RBX: ffff888109f5ba28 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881008a2860 RBP: ffff888109f5b9d8 R08: 0000000000000000 R09: 0000000000000000 R10: ffff888109f5b978 R11: ffff888109f5b948 R12: 00000000ffffff9f R13: ffff8881008a2a80 R14: ffff8881008a2860 R15: ffff8881008a2840 FS: 00007f98de70f100(0000) GS:ffff88822bf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000100efc000 CR4: 00000000000006e0 Call Trace: <TASK> nh_create_ipv6+0xed/0x10c rtm_new_nexthop+0x6d7/0x13f3 ? check_preemption_disabled+0x3d/0xf2 ? lock_is_held_type+0xbe/0xfd rtnetlink_rcv_msg+0x23f/0x26a ? check_preemption_disabled+0x3d/0xf2 ? rtnl_calcit.isra.0+0x147/0x147 netlink_rcv_skb+0x61/0xb2 netlink_unicast+0x100/0x187 netlink_sendmsg+0x37f/0x3a0 ? netlink_unicast+0x187/0x187 sock_sendmsg_nosec+0x67/0x9b ____sys_sendmsg+0x19d/0x1f9 ? copy_msghdr_from_user+0x4c/0x5e ? rcu_read_lock_any_held+0x2a/0x78 ___sys_sendmsg+0x6c/0x8c ? asm_sysvec_apic_timer_interrupt+0x12/0x20 ? lockdep_hardirqs_on+0xd9/0x102 ? sockfd_lookup_light+0x69/0x99 __sys_sendmsg+0x50/0x6e do_syscall_64+0xcb/0xf2 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f98dea28914 Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 48 8d 05 e9 5d 0c 00 8b 00 85 c0 75 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 41 89 d4 55 48 89 f5 53 RSP: 002b:00007fff859f5e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e2e RAX: ffffffffffffffda RBX: 00000000619cb810 RCX: 00007f98dea28914 RDX: 0000000000000000 RSI: 00007fff859f5ed0 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000008 R10: fffffffffffffce6 R11: 0000000000000246 R12: 0000000000000001 R13: 000055c0097ae520 R14: 000055c0097957fd R15: 00007fff859f63a0 </TASK> Modules linked in: bridge stp llc bonding virtio_net Cc: stable@vger.kernel.org Fixes: 53010f99 ("nexthop: Add support for IPv6 gateways") Signed-off-by:
Nikolay Aleksandrov <nikolay@nvidia.com> Signed-off-by:
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Huang Pei authored
MIPS/IA64 define END as assembly function ending, which conflict with END definition in slip.h, just undef it at first Reported-by: lkp@intel.com Signed-off-by:
Huang Pei <huangpei@loongson.cn> Signed-off-by:
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Huang Pei authored
MIPS/IA64 define END as assembly function ending, which conflict with END definition in mkiss.c, just undef it at first Reported-by: lkp@intel.com Signed-off-by:
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- 22 Nov, 2021 3 commits
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Marta Plantykow authored
Ice driver has the routines for managing XDP resources that are shared between ndo_bpf op and VSI rebuild flow. The latter takes place for example when user changes queue count on an interface via ethtool's set_channels(). There is an issue around the bpf_prog refcounting when VSI is being rebuilt - since ice_prepare_xdp_rings() is called with vsi->xdp_prog as an argument that is used later on by ice_vsi_assign_bpf_prog(), same bpf_prog pointers are swapped with each other. Then it is also interpreted as an 'old_prog' which in turn causes us to call bpf_prog_put on it that will decrement its refcount. Below splat can be interpreted in a way that due to zero refcount of a bpf_prog it is wiped out from the system while kernel still tries to refer to it: [ 481.069429] BUG: unable to handle page fault for address: ffffc9000640f038 [ 481.077390] #PF: supervisor read access in kernel mode [ 481.083335] #PF: error_code(0x0000) - not-present page [ 481.089276] PGD 100000067 P4D 100000067 PUD 1001cb067 PMD 106d2b067 PTE 0 [ 481.097141] Oops: 0000 [#1] PREEMPT SMP PTI [ 481.101980] CPU: 12 PID: 3339 Comm: sudo Tainted: G OE 5.15.0-rc5+ #1 [ 481.110840] Hardware name: Intel Corp. GRANTLEY/GRANTLEY, BIOS GRRFCRB1.86B.0276.D07.1605190235 05/19/2016 [ 481.122021] RIP: 0010:dev_xdp_prog_id+0x25/0x40 [ 481.127265] Code: 80 00 00 00 00 0f 1f 44 00 00 89 f6 48 c1 e6 04 48 01 fe 48 8b 86 98 08 00 00 48 85 c0 74 13 48 8b 50 18 31 c0 48 85 d2 74 07 <48> 8b 42 38 8b 40 20 c3 48 8b 96 90 08 00 00 eb e8 66 2e 0f 1f 84 [ 481.148991] RSP: 0018:ffffc90007b63868 EFLAGS: 00010286 [ 481.155034] RAX: 0000000000000000 RBX: ffff889080824000 RCX: 0000000000000000 [ 481.163278] RDX: ffffc9000640f000 RSI: ffff889080824010 RDI: ffff889080824000 [ 481.171527] RBP: ffff888107af7d00 R08: 0000000000000000 R09: ffff88810db5f6e0 [ 481.179776] R10: 0000000000000000 R11: ffff8890885b9988 R12: ffff88810db5f4bc [ 481.188026] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 481.196276] FS: 00007f5466d5bec0(0000) GS:ffff88903fb00000(0000) knlGS:0000000000000000 [ 481.205633] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 481.212279] CR2: ffffc9000640f038 CR3: 000000014429c006 CR4: 00000000003706e0 [ 481.220530] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 481.228771] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 481.237029] Call Trace: [ 481.239856] rtnl_fill_ifinfo+0x768/0x12e0 [ 481.244602] rtnl_dump_ifinfo+0x525/0x650 [ 481.249246] ? __alloc_skb+0xa5/0x280 [ 481.253484] netlink_dump+0x168/0x3c0 [ 481.257725] netlink_recvmsg+0x21e/0x3e0 [ 481.262263] ____sys_recvmsg+0x87/0x170 [ 481.266707] ? __might_fault+0x20/0x30 [ 481.271046] ? _copy_from_user+0x66/0xa0 [ 481.275591] ? iovec_from_user+0xf6/0x1c0 [ 481.280226] ___sys_recvmsg+0x82/0x100 [ 481.284566] ? sock_sendmsg+0x5e/0x60 [ 481.288791] ? __sys_sendto+0xee/0x150 [ 481.293129] __sys_recvmsg+0x56/0xa0 [ 481.297267] do_syscall_64+0x3b/0xc0 [ 481.301395] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 481.307238] RIP: 0033:0x7f5466f39617 [ 481.311373] Code: 0c 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb bd 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2f 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10 [ 481.342944] RSP: 002b:00007ffedc7f4308 EFLAGS: 00000246 ORIG_RAX: 000000000000002f [ 481.361783] RAX: ffffffffffffffda RBX: 00007ffedc7f5460 RCX: 00007f5466f39617 [ 481.380278] RDX: 0000000000000000 RSI: 00007ffedc7f5360 RDI: 0000000000000003 [ 481.398500] RBP: 00007ffedc7f53f0 R08: 0000000000000000 R09: 000055d556f04d50 [ 481.416463] R10: 0000000000000077 R11: 0000000000000246 R12: 00007ffedc7f5360 [ 481.434131] R13: 00007ffedc7f5350 R14: 00007ffedc7f5344 R15: 0000000000000e98 [ 481.451520] Modules linked in: ice(OE) af_packet binfmt_misc nls_iso8859_1 ipmi_ssif intel_rapl_msr intel_rapl_common x86_pkg_temp_thermal intel_powerclamp mxm_wmi mei_me coretemp mei ipmi_si ipmi_msghandler wmi acpi_pad acpi_power_meter ip_tables x_tables autofs4 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel ahci crypto_simd cryptd libahci lpc_ich [last unloaded: ice] [ 481.528558] CR2: ffffc9000640f038 [ 481.542041] ---[ end trace d1f24c9ecf5b61c1 ]--- Fix this by only calling ice_vsi_assign_bpf_prog() inside ice_prepare_xdp_rings() when current vsi->xdp_prog pointer is NULL. This way set_channels() flow will not attempt to swap the vsi->xdp_prog pointers with itself. Also, sprinkle around some comments that provide a reasoning about correlation between driver and kernel in terms of bpf_prog refcount. Fixes: efc2214b ("ice: Add support for XDP") Reviewed-by:
Alexander Lobakin <alexandr.lobakin@intel.com> Signed-off-by:
Marta Plantykow <marta.a.plantykow@intel.com> Co-developed-by:
Maciej Fijalkowski <maciej.fijalkowski@intel.com> Signed-off-by:
Kiran Bhandare <kiranx.bhandare@intel.com> Signed-off-by:
Tony Nguyen <anthony.l.nguyen@intel.com>
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Maciej Fijalkowski authored
The approach of having XDP queue per CPU regardless of user's setting exposed a hidden bug that could occur in case when Rx queue count differ from Tx queue count. Currently vsi->txq_map's size is equal to the doubled vsi->alloc_txq, which is not correct due to the fact that XDP rings were previously based on the Rx queue count. Below splat can be seen when ethtool -L is used and XDP rings are configured: [ 682.875339] BUG: kernel NULL pointer dereference, address: 000000000000000f [ 682.883403] #PF: supervisor read access in kernel mode [ 682.889345] #PF: error_code(0x0000) - not-present page [ 682.895289] PGD 0 P4D 0 [ 682.898218] Oops: 0000 [#1] PREEMPT SMP PTI [ 682.903055] CPU: 42 PID: 2878 Comm: ethtool Tainted: G OE 5.15.0-rc5+ #1 [ 682.912214] Hardware name: Intel Corp. GRANTLEY/GRANTLEY, BIOS GRRFCRB1.86B.0276.D07.1605190235 05/19/2016 [ 682.923380] RIP: 0010:devres_remove+0x44/0x130 [ 682.928527] Code: 49 89 f4 55 48 89 fd 4c 89 ff 53 48 83 ec 10 e8 92 b9 49 00 48 8b 9d a8 02 00 00 48 8d 8d a0 02 00 00 49 89 c2 48 39 cb 74 0f <4c> 3b 63 10 74 25 48 8b 5b 08 48 39 cb 75 f1 4c 89 ff 4c 89 d6 e8 [ 682.950237] RSP: 0018:ffffc90006a679f0 EFLAGS: 00010002 [ 682.956285] RAX: 0000000000000286 RBX: ffffffffffffffff RCX: ffff88908343a370 [ 682.964538] RDX: 0000000000000001 RSI: ffffffff81690d60 RDI: 0000000000000000 [ 682.972789] RBP: ffff88908343a0d0 R08: 0000000000000000 R09: 0000000000000000 [ 682.981040] R10: 0000000000000286 R11: 3fffffffffffffff R12: ffffffff81690d60 [ 682.989282] R13: ffffffff81690a00 R14: ffff8890819807a8 R15: ffff88908343a36c [ 682.997535] FS: 00007f08c7bfa740(0000) GS:ffff88a03fd00000(0000) knlGS:0000000000000000 [ 683.006910] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 683.013557] CR2: 000000000000000f CR3: 0000001080a66003 CR4: 00000000003706e0 [ 683.021819] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 683.030075] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 683.038336] Call Trace: [ 683.041167] devm_kfree+0x33/0x50 [ 683.045004] ice_vsi_free_arrays+0x5e/0xc0 [ice] [ 683.050380] ice_vsi_rebuild+0x4c8/0x750 [ice] [ 683.055543] ice_vsi_recfg_qs+0x9a/0x110 [ice] [ 683.060697] ice_set_channels+0x14f/0x290 [ice] [ 683.065962] ethnl_set_channels+0x333/0x3f0 [ 683.070807] genl_family_rcv_msg_doit+0xea/0x150 [ 683.076152] genl_rcv_msg+0xde/0x1d0 [ 683.080289] ? channels_prepare_data+0x60/0x60 [ 683.085432] ? genl_get_cmd+0xd0/0xd0 [ 683.089667] netlink_rcv_skb+0x50/0xf0 [ 683.094006] genl_rcv+0x24/0x40 [ 683.097638] netlink_unicast+0x239/0x340 [ 683.102177] netlink_sendmsg+0x22e/0x470 [ 683.106717] sock_sendmsg+0x5e/0x60 [ 683.110756] __sys_sendto+0xee/0x150 [ 683.114894] ? handle_mm_fault+0xd0/0x2a0 [ 683.119535] ? do_user_addr_fault+0x1f3/0x690 [ 683.134173] __x64_sys_sendto+0x25/0x30 [ 683.148231] do_syscall_64+0x3b/0xc0 [ 683.161992] entry_SYSCALL_64_after_hwframe+0x44/0xae Fix this by taking into account the value that num_possible_cpus() yields in addition to vsi->alloc_txq instead of doubling the latter. Fixes: efc2214b ("ice: Add support for XDP") Fixes: 22bf877e ("ice: introduce XDP_TX fallback path") Reviewed-by:
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David S. Miller authored
Nikolay Aleksandrov says: ==================== net: nexthop: fix refcount issues when replacing groups This set fixes a refcount bug when replacing nexthop groups and modifying routes. It is complex because the objects look valid when debugging memory dumps, but we end up having refcount dependency between unlinked objects which can never be released, so in turn they cannot free their resources and refcounts. The problem happens because we can have stale IPv6 per-cpu dsts in nexthops which were removed from a group. Even though the IPv6 gen is bumped, the dsts won't be released until traffic passes through them or the nexthop is freed, that can take arbitrarily long time, and even worse we can create a scenario[1] where it can never be released. The fix is to release the IPv6 per-cpu dsts of replaced nexthops after an RCU grace period so no new ones can be created. To do that we add a new IPv6 stub - fib6_nh_release_dsts, which is used by the nexthop code only when necessary. We can further optimize group replacement, but that is more suited for net-next as these patches would have to be backported to stable releases. v2: patch 02: update commit msg patch 03: check for mausezahn before testing and make a few comments more verbose [1] This info is also present in patch 02's commit message. Initial state: $ ip nexthop list id 200 via 2002:db8::2 dev bridge.10 scope link onlink id 201 via 2002:db8::3 dev bridge scope link onlink id 203 group 201/200 $ ip -6 route 2001:db8::10 nhid 203 metric 1024 pref medium nexthop via 2002:db8::3 dev bridge weight 1 onlink nexthop via 2002:db8::2 dev bridge.10 weight 1 onlink Create rt6_info through one of the multipath legs, e.g.: $ taskset -a -c 1 ./pkt_inj 24 bridge.10 2001:db8::10 (pkt_inj is just a custom packet generator, nothing special) Then remove that leg from the group by replace (let's assume it is id 200 in this case): $ ip nexthop replace id 203 group 201 Now remove the IPv6 route: $ ip -6 route del 2001:db8::10/128 The route won't be really deleted due to the stale rt6_info holding 1 refcnt in nexthop id 200. At this point we have the following reference count dependency: (deleted) IPv6 route holds 1 reference over nhid 203 nh 203 holds 1 ref over id 201 nh 200 holds 1 ref over the net device and the route due to the stale rt6_info Now to create circular dependency between nh 200 and the IPv6 route, and also to get a reference over nh 200, restore nhid 200 in the group: $ ip nexthop replace id 203 group 201/200 And now we have a permanent circular dependncy because nhid 203 holds a reference over nh 200 and 201, but the route holds a ref over nh 203 and is deleted. To trigger the bug just delete the group (nhid 203): $ ip nexthop del id 203 It won't really be deleted due to the IPv6 route dependency, and now we have 2 unlinked and deleted objects that reference each other: the group and the IPv6 route. Since the group drops the reference it holds over its entries at free time (i.e. its own refcount needs to drop to 0) that will never happen and we get a permanent ref on them, since one of the entries holds a reference over the IPv6 route it will also never be released. At this point the dependencies are: (deleted, only unlinked) IPv6 route holds reference over group nh 203 (deleted, only unlinked) group nh 203 holds reference over nh 201 and 200 nh 200 holds 1 ref over the net device and the route due to the stale rt6_info This is the last point where it can be fixed by running traffic through nh 200, and specifically through the same CPU so the rt6_info (dst) will get released due to the IPv6 genid, that in turn will free the IPv6 route, which in turn will free the ref count over the group nh 203. If nh 200 is deleted at this point, it will never be released due to the ref from the unlinked group 203, it will only be unlinked: $ ip nexthop del id 200 $ ip nexthop $ Now we can never release that stale rt6_info, we have IPv6 route with ref over group nh 203, group nh 203 with ref over nh 200 and 201, nh 200 with rt6_info (dst) with ref over the net device and the IPv6 route. All of these objects are only unlinked, and cannot be released, thus they can't release their ref counts. Message from syslogd@dev at Nov 19 14:04:10 ... kernel:[73501.828730] unregister_netdevice: waiting for bridge.10 to become free. Usage count = 3 Message from syslogd@dev at Nov 19 14:04:20 ... kernel:[73512.068811] unregister_netdevice: waiting for bridge.10 to become free. Usage count = 3 ==================== Signed-off-by:
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