- 14 Feb, 2024 40 commits
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Eric Dumazet authored
dev_base_lock is going away, add netdev_set_operstate() helper so that hsr does not have to know core internals. Remove dev_base_lock acquisition from rfc2863_policy() v3: use an "unsigned int" for dev->operstate, so that try_cmpxchg() can work on all arches. ( https://lore.kernel.org/oe-kbuild-all/202402081918.OLyGaea3-lkp@intel.com/ ) Signed-off-by:Eric Dumazet <edumazet@google.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Eric Dumazet authored
Change comments incorrectly mentioning dev_base_lock. Signed-off-by:
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Eric Dumazet authored
dev_get_stats() can be called from RCU, there is no need to acquire dev_base_lock. Change dev_isalive() comment to reflect we no longer use dev_base_lock from net/core/net-sysfs.c Signed-off-by:
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Eric Dumazet authored
operstate_show() can omit dev_base_lock acquisition only to read dev->operstate. Annotate accesses to dev->operstate. Writers still acquire dev_base_lock for mutual exclusion. Signed-off-by:
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Eric Dumazet authored
Using dev_base_lock is not preventing from reading garbage. Use dev_addr_sem instead. v4: place dev_addr_sem extern in net/core/dev.h (Jakub Kicinski) Link: https://lore.kernel.org/netdev/20240212175845.10f6680a@kernel.org/Signed-off-by:
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Eric Dumazet authored
Make clear dev_isalive() can be called with RCU protection. Then convert netdev_show() to RCU, to remove dev_base_lock dependency. Also add RCU to broadcast_show(). Signed-off-by:
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Eric Dumazet authored
Prepares things so that dev->reg_state reads can be lockless, by adding WRITE_ONCE() on write side. READ_ONCE()/WRITE_ONCE() do not support bitfields. Signed-off-by:
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Eric Dumazet authored
Following patch will read dev->link locklessly, annotate the write from do_setlink(). Signed-off-by:
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Eric Dumazet authored
t->parms.link is read locklessly, annotate these reads and opposite writes accordingly. Signed-off-by:
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Eric Dumazet authored
name_assign_type_show() runs locklessly, we should annotate accesses to dev->name_assign_type. Alternative would be to grab devnet_rename_sem semaphore from name_assign_type_show(), but this would not bring more accuracy. Signed-off-by:
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David S. Miller authored
Joe Damato says: ==================== Per epoll context busy poll support Greetings: Welcome to v8. TL;DR This builds on commit bf3b9f63 ("epoll: Add busy poll support to epoll with socket fds.") by allowing user applications to enable epoll-based busy polling, set a busy poll packet budget, and enable or disable prefer busy poll on a per epoll context basis. This makes epoll-based busy polling much more usable for user applications than the current system-wide sysctl and hardcoded budget. To allow for this, two ioctls have been added for epoll contexts for getting and setting a new struct, struct epoll_params. ioctl was chosen vs a new syscall after reviewing a suggestion by Willem de Bruijn [1]. I am open to using a new syscall instead of an ioctl, but it seemed that: - Busy poll affects all existing epoll_wait and epoll_pwait variants in the same way, so new verions of many syscalls might be needed. It seems much simpler for users to use the correct epoll_wait/epoll_pwait for their app and add a call to ioctl to enable or disable busy poll as needed. This also probably means less work to get an existing epoll app using busy poll. - previously added epoll_pwait2 helped to bring epoll closer to existing syscalls (like pselect and ppoll) and this busy poll change reflected as a new syscall would not have the same effect. Note: patch 1/4 as of v4 uses an or (||) instead of an xor. I thought about it some more and I realized that if the user enables both the per-epoll context setting and the system wide sysctl, then busy poll should be enabled and not disabled. Using xor doesn't seem to make much sense after thinking through this a bit. Longer explanation: Presently epoll has support for a very useful form of busy poll based on the incoming NAPI ID (see also: SO_INCOMING_NAPI_ID [2]). This form of busy poll allows epoll_wait to drive NAPI packet processing which allows for a few interesting user application designs which can reduce latency and also potentially improve L2/L3 cache hit rates by deferring NAPI until userland has finished its work. The documentation available on this is, IMHO, a bit confusing so please allow me to explain how one might use this: 1. Ensure each application thread has its own epoll instance mapping 1-to-1 with NIC RX queues. An n-tuple filter would likely be used to direct connections with specific dest ports to these queues. 2. Optionally: Setup IRQ coalescing for the NIC RX queues where busy polling will occur. This can help avoid the userland app from being pre-empted by a hard IRQ while userland is running. Note this means that userland must take care to call epoll_wait and not take too long in userland since it now drives NAPI via epoll_wait. 3. Optionally: Consider using napi_defer_hard_irqs and gro_flush_timeout to further restrict IRQ generation from the NIC. These settings are system-wide so their impact must be carefully weighed against the running applications. 4. Ensure that all incoming connections added to an epoll instance have the same NAPI ID. This can be done with a BPF filter when SO_REUSEPORT is used or getsockopt + SO_INCOMING_NAPI_ID when a single accept thread is used which dispatches incoming connections to threads. 5. Lastly, busy poll must be enabled via a sysctl (/proc/sys/net/core/busy_poll). Please see Eric Dumazet's paper about busy polling [3] and a recent academic paper about measured performance improvements of busy polling [4] (albeit with a modification that is not currently present in the kernel) for additional context. The unfortunate part about step 5 above is that this enables busy poll system-wide which affects all user applications on the system, including epoll-based network applications which were not intended to be used this way or applications where increased CPU usage for lower latency network processing is unnecessary or not desirable. If the user wants to run one low latency epoll-based server application with epoll-based busy poll, but would like to run the rest of the applications on the system (which may also use epoll) without busy poll, this system-wide sysctl presents a significant problem. This change preserves the system-wide sysctl, but adds a mechanism (via ioctl) to enable or disable busy poll for epoll contexts as needed by individual applications, making epoll-based busy poll more usable. Note that this change includes an or (as of v4) instead of an xor. If the user has enabled both the system-wide sysctl and also the per epoll-context busy poll settings, then epoll should probably busy poll (vs being disabled). Thanks, Joe v7 -> v8: - Reviewed-by tag from Eric Dumazet applied to commit message of patch 1/4. - patch 4/4: - EPIOCSPARAMS and EPIOCGPARAMS updated to use WRITE_ONCE and READ_ONCE, as requested by Eric Dumazet - Wrapped a long line (via netdev/checkpatch) v6 -> v7: - Acked-by tags from Stanislav Fomichev applied to commit messages of all patches. - Reviewed-by tags from Jakub Kicinski, Eric Dumazet applied to commit messages of patches 2 and 3. Jiri Slaby's Reviewed-by applied to patch 4. - patch 1/4: - busy_poll_usecs reduced from u64 to u32. - Unnecessary parens removed (via netdev/checkpatch) - Wrapped long line (via netdev/checkpatch) - Remove inline from busy_loop_ep_timeout as objdump suggests the function is already inlined - Moved struct eventpoll assignment to declaration - busy_loop_ep_timeout is moved within CONFIG_NET_RX_BUSY_POLL and the ifdefs internally have been removed as per Eric Dumazet's review - Removed ep_busy_loop_on from the !defined CONFIG_NET_RX_BUSY_POLL section as it is only called when CONFIG_NET_RX_BUSY_POLL is defined - patch 3/4: - Fix whitespace alignment issue (via netdev/checkpatch) - patch 4/4: - epoll_params.busy_poll_usecs has been reduced to u32 - epoll_params.busy_poll_usecs is now checked to ensure it is <= S32_MAX - __pad has been reduced to a single u8 - memchr_inv has been dropped and replaced with a simple check for the single __pad byte - Removed space after cast (via netdev/checkpatch) - Wrap long line (via netdev/checkpatch) - Move struct eventpoll *ep assignment to declaration as per Jiri Slaby's review - Remove unnecessary !! as per Jiri Slaby's review - Reorganized variables to be reverse christmas tree order v5 -> v6: - patch 1/3 no functional change, but commit message corrected to explain that an or (||) is being used instead of xor. - patch 3/4 is a new patch which adds support for per epoll context prefer busy poll setting. - patch 4/4 updated to allow getting/setting per epoll context prefer busy poll setting; this setting is limited to either 0 or 1. v4 -> v5: - patch 3/3 updated to use memchr_inv to ensure that __pad is zero for the EPIOCSPARAMS ioctl. Recommended by Greg K-H [5], Dave Chinner [6], and Jiri Slaby [7]. v3 -> v4: - patch 1/3 was updated to include an important functional change: ep_busy_loop_on was updated to use or (||) instead of xor (^). After thinking about it a bit more, I thought xor didn't make much sense. Enabling both the per-epoll context and the system-wide sysctl should probably enable busy poll, not disable it. So, or (||) makes more sense, I think. - patch 3/3 was updated: - to change the epoll_params fields to be __u64, __u16, and __u8 and to pad the struct to a multiple of 64bits. Suggested by Greg K-H [8] and Arnd Bergmann [9]. - remove an unused pr_fmt, left over from the previous revision. - ioctl now returns -EINVAL when epoll_params.busy_poll_usecs > U32_MAX. v2 -> v3: - cover letter updated to mention why ioctl seems (to me) like a better choice vs a new syscall. - patch 3/4 was modified in 3 ways: - when an unknown ioctl is received, -ENOIOCTLCMD is returned instead of -EINVAL as the ioctl documentation requires. - epoll_params.busy_poll_budget can only be set to a value larger than NAPI_POLL_WEIGHT if code is run by privileged (CAP_NET_ADMIN) users. Otherwise, -EPERM is returned. - busy poll specific ioctl code moved out to its own function. On kernels without busy poll support, -EOPNOTSUPP is returned. This also makes the kernel build robot happier without littering the code with more #ifdefs. - dropped patch 4/4 after Eric Dumazet's review of it when it was sent independently to the list [10]. v1 -> v2: - cover letter updated to make a mention of napi_defer_hard_irqs and gro_flush_timeout as an added step 3 and to cite both Eric Dumazet's busy polling paper and a paper from University of Waterloo for additional context. Specifically calling out the xor in patch 1/4 incase it is missed by reviewers. - Patch 2/4 has its commit message updated, but no functional changes. Commit message now describes that allowing for a settable budget helps to improve throughput and is more consistent with other busy poll mechanisms that allow a settable budget via SO_BUSY_POLL_BUDGET. - Patch 3/4 was modified to check if the epoll_params.busy_poll_budget exceeds NAPI_POLL_WEIGHT. The larger value is allowed, but an error is printed. This was done for consistency with netif_napi_add_weight, which does the same. - Patch 3/4 the struct epoll_params was updated to fix the type of the data field; it was uint8_t and was changed to u8. - Patch 4/4 added to check if SO_BUSY_POLL_BUDGET exceeds NAPI_POLL_WEIGHT. The larger value is allowed, but an error is printed. This was done for consistency with netif_napi_add_weight, which does the same. ==================== Signed-off-by:
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Joe Damato authored
Add an ioctl for getting and setting epoll_params. User programs can use this ioctl to get and set the busy poll usec time, packet budget, and prefer busy poll params for a specific epoll context. Parameters are limited: - busy_poll_usecs is limited to <= s32_max - busy_poll_budget is limited to <= NAPI_POLL_WEIGHT by unprivileged users (!capable(CAP_NET_ADMIN)) - prefer_busy_poll must be 0 or 1 - __pad must be 0 Signed-off-by:Joe Damato <jdamato@fastly.com> Acked-by:
Stanislav Fomichev <sdf@google.com> Reviewed-by:
Jiri Slaby <jirislaby@kernel.org> Reviewed-by:
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Joe Damato authored
When using epoll-based busy poll, the prefer_busy_poll option is hardcoded to false. Users may want to enable prefer_busy_poll to be used in conjunction with gro_flush_timeout and defer_hard_irqs_count to keep device IRQs masked. Other busy poll methods allow enabling or disabling prefer busy poll via SO_PREFER_BUSY_POLL, but epoll-based busy polling uses a hardcoded value. Fix this edge case by adding support for a per-epoll context prefer_busy_poll option. The default is false, as it was hardcoded before this change. Signed-off-by:
Jakub Kicinski <kuba@kernel.org> Reviewed-by:
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Joe Damato authored
When using epoll-based busy poll, the packet budget is hardcoded to BUSY_POLL_BUDGET (8). Users may desire larger busy poll budgets, which can potentially increase throughput when busy polling under high network load. Other busy poll methods allow setting the busy poll budget via SO_BUSY_POLL_BUDGET, but epoll-based busy polling uses a hardcoded value. Fix this edge case by adding support for a per-epoll context busy poll packet budget. If not specified, the default value (BUSY_POLL_BUDGET) is used. Signed-off-by:
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Joe Damato authored
Allow busy polling on a per-epoll context basis. The per-epoll context usec timeout value is preferred, but the pre-existing system wide sysctl value is still supported if it specified. busy_poll_usecs is a u32, but in a follow up patch the ioctl provided to the user only allows setting a value from 0 to S32_MAX. Signed-off-by:
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Kamal Heib authored
There is no point in initializing an ndo to NULL, therefore the assignment is redundant and can be removed. Signed-off-by:
Kamal Heib <kheib@redhat.com> Reviewed-by:
Brett Creeley <brett.creeley@amd.com> Acked-by:
Arthur Kiyanovski <akiyano@amazon.com> Signed-off-by:
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Hariprasad Kelam authored
Packet ingress and egress MAC/serdes channel numbers are configurable on CN10K series of silicons. These channel numbers inturn used while installing MCAM rules to match ingress/egress port. Fetch these channel numbers from firmware at driver init time. Signed-off-by:
Hariprasad Kelam <hkelam@marvell.com> Signed-off-by:
Sunil Kovvuri Goutham <sgoutham@marvell.com> Signed-off-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queueDavid S. Miller authored
Tony Nguyen says: ==================== Intel Wired LAN Driver Updates 2024-02-12 (ice) This series contains updates to ice driver only. Grzegorz adds support for E825-C devices. Wojciech reworks devlink reload to fulfill expected conditions (remove and readd). ==================== Signed-off-by: -
David S. Miller authored
Merge tag 'linux-can-next-for-6.9-20240213' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next Marc Kleine-Budde says: ==================== linux-can-next-for-6.9-20240213 this is a pull request of 23 patches for net-next/master. The first patch is by Nicolas Maier and targets the CAN Broadcast Manager (bcm), it adds message flags to distinguish between own local and remote traffic. Oliver Hartkopp contributes a patch for the CAN ISOTP protocol that adds dynamic flow control parameters. Stefan Mätje's patch series add support for the esd PCIe/402 CAN interface family. Markus Schneider-Pargmann contributes 14 patches for the m_can to optimize for the SPI attached tcan4x5x controller. A patch by Vincent Mailhol replaces Wolfgang Grandegger by Vincent Mailhol as the CAN drivers Co-Maintainer. Jimmy Assarsson's patch add support for the Kvaser M.2 PCIe 4xCAN adapter. A patch by Daniil Dulov removed a redundant NULL check in the softing driver. Oliver Hartkopp contributes a patch to add CANXL virtual CAN network identifier support. A patch by myself removes Naga Sureshkumar Relli as the maintainer of the xilinx_can driver, as their email bounces. ==================== Signed-off-by:
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Jakub Kicinski authored
Lorenzo Bianconi says: ==================== add multi-buff support for xdp running in generic mode Introduce multi-buffer support for xdp running in generic mode not always linearizing the skb in netif_receive_generic_xdp routine. Introduce generic percpu page_pools allocator. ==================== Link: https://lore.kernel.org/r/cover.1707729884.git.lorenzo@kernel.orgSigned-off-by:
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Lorenzo Bianconi authored
Rely on skb_pp_cow_data utility routine and remove duplicated code. Acked-by:
Jesper Dangaard Brouer <hawk@kernel.org> Reviewed-by:
Toke Hoiland-Jorgensen <toke@redhat.com> Signed-off-by:
Lorenzo Bianconi <lorenzo@kernel.org> Link: https://lore.kernel.org/r/029cc14cce41cb242ee7efdcf32acc81f1ce4e9f.1707729884.git.lorenzo@kernel.orgSigned-off-by:
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Lorenzo Bianconi authored
Similar to native xdp, do not always linearize the skb in netif_receive_generic_xdp routine but create a non-linear xdp_buff to be processed by the eBPF program. This allow to add multi-buffer support for xdp running in generic mode. Acked-by:
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Lorenzo Bianconi authored
Rely on skb pointer reference instead of the skb pointer in do_xdp_generic and netif_receive_generic_xdp routine signatures. This is a preliminary patch to add multi-buff support for xdp running in generic mode where we will need to reallocate the skb to avoid linearization and we will need to make it visible to do_xdp_generic() caller. Acked-by:
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Lorenzo Bianconi authored
Introduce generic percpu page_pools allocator. Moreover add page_pool_create_percpu() and cpuid filed in page_pool struct in order to recycle the page in the page_pool "hot" cache if napi_pp_put_page() is running on the same cpu. This is a preliminary patch to add xdp multi-buff support for xdp running in generic mode. Acked-by:
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Luiz Angelo Daros de Luca authored
While no supported devices currently utilize EXT0, the register reserves the bits for an EXT0. EXT0 is utilized by devices from the generation prior to rtl8365mb, such as those supported by the driver library rtl8367b. Signed-off-by:
Luiz Angelo Daros de Luca <luizluca@gmail.com> Reviewed-by:
Alvin Šipraga <alsi@bang-olufsen.dk> Reviewed-by:
Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20240212-realtek-fix_ext0-v1-1-f3d2536d191a@gmail.comSigned-off-by:
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Jakub Kicinski authored
Heiner Kallweit says: ==================== r8169: extend EEE tx idle timer support This series extends EEE tx idle timer support, and exposes the timer value to userspace. ==================== Link: https://lore.kernel.org/r/89a5fef5-a4b7-4d5d-9c35-764248be5a19@gmail.comSigned-off-by:
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Heiner Kallweit authored
Add support for returning the tx_lpi_timer value to userspace. This is supported by few chip versions only: RTL8168h/RTL8125/RTL8126 Signed-off-by:
Heiner Kallweit <hkallweit1@gmail.com> Reviewed-by:
Andrew Lunn <andrew@lunn.ch> Link: https://lore.kernel.org/r/4eee9c34-c5d6-4c96-9b05-455896dea59a@gmail.comSigned-off-by:
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Heiner Kallweit authored
Support setting the EEE tx idle timer also on RTL8168h. Signed-off-by:
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Heiner Kallweit authored
Add a generic setter for the EEE tx idle timer and use it with all RTL8125/RTL8126 chip versions, in line with the vendor driver. This prepares for adding EEE tx idle timer support for additional chip versions. Signed-off-by:
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Heiner Kallweit authored
This adds LED support for RTL8125/RTL8126. Note: Due to missing datasheets changing the 5Gbps link mode isn't supported for RTL8126. Signed-off-by:
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Krzysztof Kozlowski authored
Convert the Qualcomm Atheros AR9331 built-in switch bindings to DT schema. Signed-off-by:
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Reviewed-by:
Conor Dooley <conor.dooley@microchip.com> Reviewed-by:
Oleksij Rempel <o.rempel@pengutronix.de> Link: https://lore.kernel.org/r/20240212182911.233819-1-krzysztof.kozlowski@linaro.orgSigned-off-by:
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Csókás Bence authored
FEC_ENET_FCE is the Flow Control Enable bit (bit 5) of the RCR. This is now defined as FEC_RCR_FLOWCTL. Signed-off-by:
Csókás Bence <csokas.bence@prolan.hu> Reviewed-by:
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Csókás Bence authored
Add defines for bits of ECR, RCR control registers, TX watermark etc. Signed-off-by:
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Jakub Kicinski authored
Eric Dumazet says: ==================== net: adopt netdev_lockdep_set_classes() Instead of waiting for syzbot to discover lockdep false positives, make sure we use netdev_lockdep_set_classes() a bit more. ==================== Link: https://lore.kernel.org/r/20240212140700.2795436-1-edumazet@google.comSigned-off-by:
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Eric Dumazet authored
Based on a syzbot report, it appears many virtual drivers do not yet use netdev_lockdep_set_classes(), triggerring lockdep false positives. WARNING: possible recursive locking detected 6.8.0-rc4-next-20240212-syzkaller #0 Not tainted syz-executor.0/19016 is trying to acquire lock: ffff8880162cb298 (_xmit_ETHER#2){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff8880162cb298 (_xmit_ETHER#2){+.-.}-{2:2}, at: __netif_tx_lock include/linux/netdevice.h:4452 [inline] ffff8880162cb298 (_xmit_ETHER#2){+.-.}-{2:2}, at: sch_direct_xmit+0x1c4/0x5f0 net/sched/sch_generic.c:340 but task is already holding lock: ffff8880223db4d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff8880223db4d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: __netif_tx_lock include/linux/netdevice.h:4452 [inline] ffff8880223db4d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: sch_direct_xmit+0x1c4/0x5f0 net/sched/sch_generic.c:340 other info that might help us debug this: Possible unsafe locking scenario: CPU0 lock(_xmit_ETHER#2); lock(_xmit_ETHER#2); *** DEADLOCK *** May be due to missing lock nesting notation 9 locks held by syz-executor.0/19016: #0: ffffffff8f385208 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f385208 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6603 #1: ffffc90000a08c00 ((&in_dev->mr_ifc_timer)){+.-.}-{0:0}, at: call_timer_fn+0xc0/0x600 kernel/time/timer.c:1697 #2: ffffffff8e131520 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #2: ffffffff8e131520 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #2: ffffffff8e131520 (rcu_read_lock){....}-{1:2}, at: ip_finish_output2+0x45f/0x1360 net/ipv4/ip_output.c:228 #3: ffffffff8e131580 (rcu_read_lock_bh){....}-{1:2}, at: local_bh_disable include/linux/bottom_half.h:20 [inline] #3: ffffffff8e131580 (rcu_read_lock_bh){....}-{1:2}, at: rcu_read_lock_bh include/linux/rcupdate.h:802 [inline] #3: ffffffff8e131580 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x2c4/0x3b10 net/core/dev.c:4284 #4: ffff8880416e3258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: spin_trylock include/linux/spinlock.h:361 [inline] #4: ffff8880416e3258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: qdisc_run_begin include/net/sch_generic.h:195 [inline] #4: ffff8880416e3258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_xmit_skb net/core/dev.c:3771 [inline] #4: ffff8880416e3258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_queue_xmit+0x1262/0x3b10 net/core/dev.c:4325 #5: ffff8880223db4d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #5: ffff8880223db4d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: __netif_tx_lock include/linux/netdevice.h:4452 [inline] #5: ffff8880223db4d8 (_xmit_ETHER#2){+.-.}-{2:2}, at: sch_direct_xmit+0x1c4/0x5f0 net/sched/sch_generic.c:340 #6: ffffffff8e131520 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #6: ffffffff8e131520 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #6: ffffffff8e131520 (rcu_read_lock){....}-{1:2}, at: ip_finish_output2+0x45f/0x1360 net/ipv4/ip_output.c:228 #7: ffffffff8e131580 (rcu_read_lock_bh){....}-{1:2}, at: local_bh_disable include/linux/bottom_half.h:20 [inline] #7: ffffffff8e131580 (rcu_read_lock_bh){....}-{1:2}, at: rcu_read_lock_bh include/linux/rcupdate.h:802 [inline] #7: ffffffff8e131580 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x2c4/0x3b10 net/core/dev.c:4284 #8: ffff888014d9d258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: spin_trylock include/linux/spinlock.h:361 [inline] #8: ffff888014d9d258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: qdisc_run_begin include/net/sch_generic.h:195 [inline] #8: ffff888014d9d258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_xmit_skb net/core/dev.c:3771 [inline] #8: ffff888014d9d258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_queue_xmit+0x1262/0x3b10 net/core/dev.c:4325 stack backtrace: CPU: 1 PID: 19016 Comm: syz-executor.0 Not tainted 6.8.0-rc4-next-20240212-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 check_deadlock kernel/locking/lockdep.c:3062 [inline] validate_chain+0x15c1/0x58e0 kernel/locking/lockdep.c:3856 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] __netif_tx_lock include/linux/netdevice.h:4452 [inline] sch_direct_xmit+0x1c4/0x5f0 net/sched/sch_generic.c:340 __dev_xmit_skb net/core/dev.c:3784 [inline] __dev_queue_xmit+0x1912/0x3b10 net/core/dev.c:4325 neigh_output include/net/neighbour.h:542 [inline] ip_finish_output2+0xe66/0x1360 net/ipv4/ip_output.c:235 iptunnel_xmit+0x540/0x9b0 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x20ee/0x2960 net/ipv4/ip_tunnel.c:831 erspan_xmit+0x9de/0x1460 net/ipv4/ip_gre.c:720 __netdev_start_xmit include/linux/netdevice.h:4989 [inline] netdev_start_xmit include/linux/netdevice.h:5003 [inline] xmit_one net/core/dev.c:3555 [inline] dev_hard_start_xmit+0x242/0x770 net/core/dev.c:3571 sch_direct_xmit+0x2b6/0x5f0 net/sched/sch_generic.c:342 __dev_xmit_skb net/core/dev.c:3784 [inline] __dev_queue_xmit+0x1912/0x3b10 net/core/dev.c:4325 neigh_output include/net/neighbour.h:542 [inline] ip_finish_output2+0xe66/0x1360 net/ipv4/ip_output.c:235 igmpv3_send_cr net/ipv4/igmp.c:723 [inline] igmp_ifc_timer_expire+0xb71/0xd90 net/ipv4/igmp.c:813 call_timer_fn+0x17e/0x600 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x621/0x830 kernel/time/timer.c:2038 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2051 __do_softirq+0x2bc/0x943 kernel/softirq.c:554 invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf2/0x1c0 kernel/softirq.c:633 irq_exit_rcu+0x9/0x30 kernel/softirq.c:645 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1076 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1076 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:resched_offsets_ok kernel/sched/core.c:10127 [inline] RIP: 0010:__might_resched+0x16f/0x780 kernel/sched/core.c:10142 Code: 00 4c 89 e8 48 c1 e8 03 48 ba 00 00 00 00 00 fc ff df 48 89 44 24 38 0f b6 04 10 84 c0 0f 85 87 04 00 00 41 8b 45 00 c1 e0 08 <01> d8 44 39 e0 0f 85 d6 00 00 00 44 89 64 24 1c 48 8d bc 24 a0 00 RSP: 0018:ffffc9000ee069e0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8880296a9e00 RDX: dffffc0000000000 RSI: ffff8880296a9e00 RDI: ffffffff8bfe8fa0 RBP: ffffc9000ee06b00 R08: ffffffff82326877 R09: 1ffff11002b5ad1b R10: dffffc0000000000 R11: ffffed1002b5ad1c R12: 0000000000000000 R13: ffff8880296aa23c R14: 000000000000062a R15: 1ffff92001dc0d44 down_write+0x19/0x50 kernel/locking/rwsem.c:1578 kernfs_activate fs/kernfs/dir.c:1403 [inline] kernfs_add_one+0x4af/0x8b0 fs/kernfs/dir.c:819 __kernfs_create_file+0x22e/0x2e0 fs/kernfs/file.c:1056 sysfs_add_file_mode_ns+0x24a/0x310 fs/sysfs/file.c:307 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x4f4/0xf20 fs/sysfs/group.c:152 internal_create_groups fs/sysfs/group.c:192 [inline] sysfs_create_groups+0x56/0x120 fs/sysfs/group.c:218 create_dir lib/kobject.c:78 [inline] kobject_add_internal+0x472/0x8d0 lib/kobject.c:240 kobject_add_varg lib/kobject.c:374 [inline] kobject_init_and_add+0x124/0x190 lib/kobject.c:457 netdev_queue_add_kobject net/core/net-sysfs.c:1706 [inline] netdev_queue_update_kobjects+0x1f3/0x480 net/core/net-sysfs.c:1758 register_queue_kobjects net/core/net-sysfs.c:1819 [inline] netdev_register_kobject+0x265/0x310 net/core/net-sysfs.c:2059 register_netdevice+0x1191/0x19c0 net/core/dev.c:10298 bond_newlink+0x3b/0x90 drivers/net/bonding/bond_netlink.c:576 rtnl_newlink_create net/core/rtnetlink.c:3506 [inline] __rtnl_newlink net/core/rtnetlink.c:3726 [inline] rtnl_newlink+0x158f/0x20a0 net/core/rtnetlink.c:3739 rtnetlink_rcv_msg+0x885/0x1040 net/core/rtnetlink.c:6606 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367 netlink_sendmsg+0xa3c/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [inline] __se_sys_sendto net/socket.c:2199 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2199 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7fc3fa87fa9c Reported-by:syzbot <syzkaller@googlegroups.com> Signed-off-by:
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Eric Dumazet authored
br_set_lockdep_class() is missing many details. Use generic netdev_lockdep_set_classes() to not worry anymore. Signed-off-by:
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Eric Dumazet authored
vlan uses vlan_dev_set_lockdep_class() which lacks qdisc_tx_busylock initialization. Use generic netdev_lockdep_set_classes() to not worry anymore. Signed-off-by:
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Jakub Kicinski authored
Eric Dumazet says: ==================== net: use net->dev_by_index in two places Bring "ip link" ordering to /proc/net/dev one (by ifindexes). Do the same for /proc/net/vlan/config v2: https://lore.kernel.org/all/20240209142441.6c56435b@kernel.org/ ==================== Link: https://lore.kernel.org/r/20240211214404.1882191-1-edumazet@google.comSigned-off-by:
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Eric Dumazet authored
Adopt net->dev_by_index as I did in commit 0e0939c0 ("net-procfs: use xarray iterator to implement /proc/net/dev") This makes sure an existing device is always visible in the dump, regardless of concurrent insertions/deletions. v2: added suggestions from Jakub Kicinski and Ido Schimmel, thanks for the help ! Link: https://lore.kernel.org/all/20240209142441.6c56435b@kernel.org/ Link: https://lore.kernel.org/all/ZckR-XOsULLI9EHc@shredder/Signed-off-by:
Ido Schimmel <idosch@nvidia.com> Link: https://lore.kernel.org/r/20240211214404.1882191-3-edumazet@google.comSigned-off-by:
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Eric Dumazet authored
Adopt net->dev_by_index as I did in commit 0e0939c0 ("net-procfs: use xarray iterator to implement /proc/net/dev") Not only this removes quadratic behavior, it also makes sure an existing vlan device is always visible in the dump, regardless of concurrent net->dev_base_head changes. Signed-off-by:
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