- 04 Nov, 2019 10 commits
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Tonghao Zhang authored
use the specified functions to init resource. Signed-off-by:
Tonghao Zhang <xiangxia.m.yue@gmail.com> Tested-by:
Greg Rose <gvrose8192@gmail.com> Acked-by:
Pravin B Shelar <pshelar@ovn.org> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Tonghao Zhang authored
Unlocking of a not locked mutex is not allowed. Other kernel thread may be in critical section while we unlock it because of setting user_feature fail. Fixes: 95a7233c ("net: openvswitch: Set OvS recirc_id from tc chain index") Cc: Paul Blakey <paulb@mellanox.com> Signed-off-by:
William Tu <u9012063@gmail.com> Acked-by:
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Tonghao Zhang authored
When we destroy the flow tables which may contain the flow_mask, so release the flow mask struct. Signed-off-by:
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Tonghao Zhang authored
The most case *index < ma->max, and flow-mask is not NULL. We add un/likely for performance. Signed-off-by:
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Tonghao Zhang authored
Simplify the code and remove the unnecessary BUILD_BUG_ON. Signed-off-by:
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Tonghao Zhang authored
The full looking up on flow table traverses all mask array. If mask-array is too large, the number of invalid flow-mask increase, performance will be drop. One bad case, for example: M means flow-mask is valid and NULL of flow-mask means deleted. +-------------------------------------------+ | M | NULL | ... | NULL | M| +-------------------------------------------+ In that case, without this patch, openvswitch will traverses all mask array, because there will be one flow-mask in the tail. This patch changes the way of flow-mask inserting and deleting, and the mask array will be keep as below: there is not a NULL hole. In the fast path, we can "break" "for" (not "continue") in flow_lookup when we get a NULL flow-mask. "break" v +-------------------------------------------+ | M | M | NULL |... | NULL | NULL| +-------------------------------------------+ This patch don't optimize slow or control path, still using ma->max to traverse. Slow path: * tbl_mask_array_realloc * ovs_flow_tbl_lookup_exact * flow_mask_find Signed-off-by: -
Tonghao Zhang authored
Port the codes to linux upstream and with little changes. Pravin B Shelar, says: | In case hash collision on mask cache, OVS does extra flow | lookup. Following patch avoid it. Link: https://github.com/openvswitch/ovs/commit/0e6efbe2712da03522532dc5e84806a96f6a0dd1Signed-off-by:
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Tonghao Zhang authored
When creating and inserting flow-mask, if there is no available flow-mask, we realloc the mask array. When removing flow-mask, if necessary, we shrink mask array. Signed-off-by:
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Tonghao Zhang authored
Port the codes to linux upstream and with little changes. Pravin B Shelar, says: | mask caches index of mask in mask_list. On packet recv OVS | need to traverse mask-list to get cached mask. Therefore array | is better for retrieving cached mask. This also allows better | cache replacement algorithm by directly checking mask's existence. Link: https://github.com/openvswitch/ovs/commit/d49fc3ff53c65e4eca9cabd52ac63396746a7ef5Signed-off-by:
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Tonghao Zhang authored
The idea of this optimization comes from a patch which is committed in 2014, openvswitch community. The author is Pravin B Shelar. In order to get high performance, I implement it again. Later patches will use it. Pravin B Shelar, says: | On every packet OVS needs to lookup flow-table with every | mask until it finds a match. The packet flow-key is first | masked with mask in the list and then the masked key is | looked up in flow-table. Therefore number of masks can | affect packet processing performance. Link: https://github.com/openvswitch/ovs/commit/5604935e4e1cbc16611d2d97f50b717aa31e8ec5Signed-off-by:
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- 02 Nov, 2019 21 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-nextDavid S. Miller authored
Alexei Starovoitov says: ==================== pull-request: bpf-next 2019-11-02 The following pull-request contains BPF updates for your *net-next* tree. We've added 30 non-merge commits during the last 7 day(s) which contain a total of 41 files changed, 1864 insertions(+), 474 deletions(-). The main changes are: 1) Fix long standing user vs kernel access issue by introducing bpf_probe_read_user() and bpf_probe_read_kernel() helpers, from Daniel. 2) Accelerated xskmap lookup, from Björn and Maciej. 3) Support for automatic map pinning in libbpf, from Toke. 4) Cleanup of BTF-enabled raw tracepoints, from Alexei. 5) Various fixes to libbpf and selftests. ==================== Signed-off-by: -
git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netDavid S. Miller authored
The only slightly tricky merge conflict was the netdevsim because the mutex locking fix overlapped a lot of driver reload reorganization. The rest were (relatively) trivial in nature. Signed-off-by: -
Alexei Starovoitov authored
Daniel Borkmann says: ==================== This set adds probe_read_{user,kernel}(), probe_read_str_{user,kernel}() helpers, fixes probe_write_user() helper and selftests. For details please see individual patches. Thanks! v2 -> v3: - noticed two more things that are fixed in here: - bpf uapi helper description used 'int size' for *_str helpers, now u32 - we need TASK_SIZE_MAX + guard page on x86-64 in patch 2 otherwise we'll trigger the 00c42373 warn as well, so full range covered now v1 -> v2: - standardize unsafe_ptr terminology in uapi header comment (Andrii) - probe_read_{user,kernel}[_str] naming scheme (Andrii) - use global data in last test case, remove relaxed_maps (Andrii) - add strict non-pagefault kernel read funcs to avoid warning in kernel probe read helpers (Alexei) ==================== Signed-off-by:Alexei Starovoitov <ast@kernel.org>
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Daniel Borkmann authored
Tested on x86-64 and Ilya was also kind enough to give it a spin on s390x, both passing with probe_user:OK there. The test is using the newly added bpf_probe_read_user() to dump sockaddr from connect call into .bss BPF map and overrides the user buffer via bpf_probe_write_user(): # ./test_progs [...] #17 pkt_md_access:OK #18 probe_user:OK #19 prog_run_xattr:OK [...] Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Signed-off-by:
Ilya Leoshkevich <iii@linux.ibm.com> Acked-by:
Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/90f449d8af25354e05080e82fc6e2d3179da30ea.1572649915.git.daniel@iogearbox.net
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Daniel Borkmann authored
Use probe read *_{kernel,user}{,_str}() helpers instead of bpf_probe_read() or bpf_probe_read_user_str() for program tests where appropriate. Signed-off-by: -
Daniel Borkmann authored
Use bpf_probe_read_user() helper instead of bpf_probe_read() for samples that attach to kprobes probing on user addresses. Signed-off-by:
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Daniel Borkmann authored
Commit 2a02759e ("bpf: Add support for BTF pointers to interpreter") explicitly states that the pointer to BTF object is a pointer to a kernel object or NULL. Therefore we should also switch to using the strict kernel probe helper which is restricted to kernel addresses only when architectures have non-overlapping address spaces. Signed-off-by:
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Daniel Borkmann authored
The current bpf_probe_read() and bpf_probe_read_str() helpers are broken in that they assume they can be used for probing memory access for kernel space addresses /as well as/ user space addresses. However, plain use of probe_kernel_read() for both cases will attempt to always access kernel space address space given access is performed under KERNEL_DS and some archs in-fact have overlapping address spaces where a kernel pointer and user pointer would have the /same/ address value and therefore accessing application memory via bpf_probe_read{,_str}() would read garbage values. Lets fix BPF side by making use of recently added 3d708182 ("uaccess: Add non-pagefault user-space read functions"). Unfortunately, the only way to fix this status quo is to add dedicated bpf_probe_read_{user,kernel}() and bpf_probe_read_{user,kernel}_str() helpers. The bpf_probe_read{,_str}() helpers are kept as-is to retain their current behavior. The two *_user() variants attempt the access always under USER_DS set, the two *_kernel() variants will -EFAULT when accessing user memory if the underlying architecture has non-overlapping address ranges, also avoiding throwing the kernel warning via 00c42373 ("x86-64: add warning for non-canonical user access address dereferences"). Fixes: a5e8c070 ("bpf: add bpf_probe_read_str helper") Fixes: 2541517c ("tracing, perf: Implement BPF programs attached to kprobes") Signed-off-by: -
Daniel Borkmann authored
Convert the bpf_probe_write_user() helper to probe_user_write() such that writes are not attempted under KERNEL_DS anymore which is buggy as kernel and user space pointers can have overlapping addresses. Also, given we have the access_ok() check inside probe_user_write(), the helper doesn't need to do it twice. Fixes: 96ae5227 ("bpf: Add bpf_probe_write_user BPF helper to be called in tracers") Signed-off-by:
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Daniel Borkmann authored
Add two new probe_kernel_read_strict() and strncpy_from_unsafe_strict() helpers which by default alias to the __probe_kernel_read() and the __strncpy_from_unsafe(), respectively, but can be overridden by archs which have non-overlapping address ranges for kernel space and user space in order to bail out with -EFAULT when attempting to probe user memory including non-canonical user access addresses [0]: 4-level page tables: user-space mem: 0x0000000000000000 - 0x00007fffffffffff non-canonical: 0x0000800000000000 - 0xffff7fffffffffff 5-level page tables: user-space mem: 0x0000000000000000 - 0x00ffffffffffffff non-canonical: 0x0100000000000000 - 0xfeffffffffffffff The idea is that these helpers are complementary to the probe_user_read() and strncpy_from_unsafe_user() which probe user-only memory. Both added helpers here do the same, but for kernel-only addresses. Both set of helpers are going to be used for BPF tracing. They also explicitly avoid throwing the splat for non-canonical user addresses from 00c42373 ("x86-64: add warning for non-canonical user access address dereferences"). For compat, the current probe_kernel_read() and strncpy_from_unsafe() are left as-is. [0] Documentation/x86/x86_64/mm.txt Signed-off-by: -
Daniel Borkmann authored
Commit 3d708182 ("uaccess: Add non-pagefault user-space read functions") missed to add probe write function, therefore factor out a probe_write_common() helper with most logic of probe_kernel_write() except setting KERNEL_DS, and add a new probe_user_write() helper so it can be used from BPF side. Again, on some archs, the user address space and kernel address space can co-exist and be overlapping, so in such case, setting KERNEL_DS would mean that the given address is treated as being in kernel address space. Signed-off-by:
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Alexei Starovoitov authored
Toke Høiland-Jørgensen says: ==================== This series adds support to libbpf for reading 'pinning' settings from BTF-based map definitions. It introduces a new open option which can set the pinning path; if no path is set, /sys/fs/bpf is used as the default. Callers can customise the pinning between open and load by setting the pin path per map, and still get the automatic reuse feature. The semantics of the pinning is similar to the iproute2 "PIN_GLOBAL" setting, and the eventual goal is to move the iproute2 implementation to be based on libbpf and the functions introduced in this series. Changelog: v6: - Fix leak of struct bpf_object in selftest - Make struct bpf_map arg const in bpf_map__is_pinned() and bpf_map__get_pin_path() v5: - Don't pin maps with pinning set, but with a value of LIBBPF_PIN_NONE - Add a few more selftests: - Should not pin map with pinning set, but value LIBBPF_PIN_NONE - Should fail to load a map with an invalid pinning value - Should fail to re-use maps with parameter mismatch - Alphabetise libbpf.map - Whitespace and typo fixes v4: - Don't check key_type_id and value_type_id when checking for map reuse compatibility. - Move building of map->pin_path into init_user_btf_map() - Get rid of 'pinning' attribute in struct bpf_map - Make sure we also create parent directory on auto-pin (new patch 3). - Abort the selftest on error instead of attempting to continue. - Support unpinning all pinned maps with bpf_object__unpin_maps(obj, NULL) - Support pinning at map->pin_path with bpf_object__pin_maps(obj, NULL) - Make re-pinning a map at the same path a noop - Rename the open option to pin_root_path - Add a bunch more self-tests for pin_maps(NULL) and unpin_maps(NULL) - Fix a couple of smaller nits v3: - Drop bpf_object__pin_maps_opts() and just use an open option to customise the pin path; also don't touch bpf_object__{un,}pin_maps() - Integrate pinning and reuse into bpf_object__create_maps() instead of having multiple loops though the map structure - Make errors in map reuse and pinning fatal to the load procedure - Add selftest to exercise pinning feature - Rebase series to latest bpf-next v2: - Drop patch that adds mounting of bpffs - Only support a single value of the pinning attribute - Add patch to fixup error handling in reuse_fd() - Implement the full automatic pinning and map reuse logic on load ==================== Acked-by: -
Toke Høiland-Jørgensen authored
This adds a new BPF selftest to exercise the new automatic map pinning code. Signed-off-by:
Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by:
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Toke Høiland-Jørgensen authored
This adds support to libbpf for setting map pinning information as part of the BTF map declaration, to get automatic map pinning (and reuse) on load. The pinning type currently only supports a single PIN_BY_NAME mode, where each map will be pinned by its name in a path that can be overridden, but defaults to /sys/fs/bpf. Since auto-pinning only does something if any maps actually have a 'pinning' BTF attribute set, we default the new option to enabled, on the assumption that seamless pinning is what most callers want. When a map has a pin_path set at load time, libbpf will compare the map pinned at that location (if any), and if the attributes match, will re-use that map instead of creating a new one. If no existing map is found, the newly created map will instead be pinned at the location. Programs wanting to customise the pinning can override the pinning paths using bpf_map__set_pin_path() before calling bpf_object__load() (including setting it to NULL to disable pinning of a particular map). Signed-off-by:
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Toke Høiland-Jørgensen authored
The existing pin_*() functions all try to create the parent directory before pinning. Move this check into the per-object _pin() functions instead. This ensures consistent behaviour when auto-pinning is added (which doesn't go through the top-level pin_maps() function), at the cost of a few more calls to mkdir(). Signed-off-by:
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Toke Høiland-Jørgensen authored
Support storing and setting a pin path in struct bpf_map, which can be used for automatic pinning. Also store the pin status so we can avoid attempts to re-pin a map that has already been pinned (or reused from a previous pinning). The behaviour of bpf_object__{un,}pin_maps() is changed so that if it is called with a NULL path argument (which was previously illegal), it will (un)pin only those maps that have a pin_path set. Signed-off-by: -
Toke Høiland-Jørgensen authored
bpf_map__reuse_fd() was calling close() in the error path before returning an error value based on errno. However, close can change errno, so that can lead to potentially misleading error messages. Instead, explicitly store errno in the err variable before each goto. Signed-off-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netLinus Torvalds authored
Pull networking fixes from David Miller: 1) Fix free/alloc races in batmanadv, from Sven Eckelmann. 2) Several leaks and other fixes in kTLS support of mlx5 driver, from Tariq Toukan. 3) BPF devmap_hash cost calculation can overflow on 32-bit, from Toke Høiland-Jørgensen. 4) Add an r8152 device ID, from Kazutoshi Noguchi. 5) Missing include in ipv6's addrconf.c, from Ben Dooks. 6) Use siphash in flow dissector, from Eric Dumazet. Attackers can easily infer the 32-bit secret otherwise etc. 7) Several netdevice nesting depth fixes from Taehee Yoo. 8) Fix several KCSAN reported errors, from Eric Dumazet. For example, when doing lockless skb_queue_empty() checks, and accessing sk_napi_id/sk_incoming_cpu lockless as well. 9) Fix jumbo packet handling in RXRPC, from David Howells. 10) Bump SOMAXCONN and tcp_max_syn_backlog values, from Eric Dumazet. 11) Fix DMA synchronization in gve driver, from Yangchun Fu. 12) Several bpf offload fixes, from Jakub Kicinski. 13) Fix sk_page_frag() recursion during memory reclaim, from Tejun Heo. 14) Fix ping latency during high traffic rates in hisilicon driver, from Jiangfent Xiao. * git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (146 commits) net: fix installing orphaned programs net: cls_bpf: fix NULL deref on offload filter removal selftests: bpf: Skip write only files in debugfs selftests: net: reuseport_dualstack: fix uninitalized parameter r8169: fix wrong PHY ID issue with RTL8168dp net: dsa: bcm_sf2: Fix IMP setup for port different than 8 net: phylink: Fix phylink_dbg() macro gve: Fixes DMA synchronization. inet: stop leaking jiffies on the wire ixgbe: Remove duplicate clear_bit() call Documentation: networking: device drivers: Remove stray asterisks e1000: fix memory leaks i40e: Fix receive buffer starvation for AF_XDP igb: Fix constant media auto sense switching when no cable is connected net: ethernet: arc: add the missed clk_disable_unprepare igb: Enable media autosense for the i350. igb/igc: Don't warn on fatal read failures when the device is removed tcp: increase tcp_max_syn_backlog max value net: increase SOMAXCONN to 4096 netdevsim: Fix use-after-free during device dismantle ... -
git://git.linux-nfs.org/projects/anna/linux-nfsLinus Torvalds authored
Pull NFS client bugfixes from Anna Schumaker: "This contains two delegation fixes (with the RCU lock leak fix marked for stable), and three patches to fix destroying the the sunrpc back channel. Stable bugfixes: - Fix an RCU lock leak in nfs4_refresh_delegation_stateid() Other fixes: - The TCP back channel mustn't disappear while requests are outstanding - The RDMA back channel mustn't disappear while requests are outstanding - Destroy the back channel when we destroy the host transport - Don't allow a cached open with a revoked delegation" * tag 'nfs-for-5.4-3' of git://git.linux-nfs.org/projects/anna/linux-nfs: NFS: Fix an RCU lock leak in nfs4_refresh_delegation_stateid() NFSv4: Don't allow a cached open with a revoked delegation SUNRPC: Destroy the back channel when we destroy the host transport SUNRPC: The RDMA back channel mustn't disappear while requests are outstanding SUNRPC: The TCP back channel mustn't disappear while requests are outstanding -
git://git.kernel.dk/linux-blockLinus Torvalds authored
Pull block fixes from Jens Axboe: - Two small nvme fixes, one is a fabrics connection fix, the other one a cleanup made possible by that fix (Anton, via Keith) - Fix requeue handling in umb ubd (Anton) - Fix spin_lock_irq() nesting in blk-iocost (Dan) - Three small io_uring fixes: - Install io_uring fd after done with ctx (me) - Clear ->result before every poll issue (me) - Fix leak of shadow request on error (Pavel) * tag 'for-linus-20191101' of git://git.kernel.dk/linux-block: iocost: don't nest spin_lock_irq in ioc_weight_write() io_uring: ensure we clear io_kiocb->result before each issue um-ubd: Entrust re-queue to the upper layers nvme-multipath: remove unused groups_only mode in ana log nvme-multipath: fix possible io hang after ctrl reconnect io_uring: don't touch ctx in setup after ring fd install io_uring: Fix leaked shadow_req -
git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linuxLinus Torvalds authored
Pull RISC-V fixes from Paul Walmsley: "One fix for PCIe users: - Fix legacy PCI I/O port access emulation One set of cleanups: - Resolve most of the warnings generated by sparse across arch/riscv. No functional changes And one MAINTAINERS update: - Update Palmer's E-mail address" * tag 'riscv/for-v5.4-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: MAINTAINERS: Change to my personal email address RISC-V: Add PCIe I/O BAR memory mapping riscv: for C functions called only from assembly, mark with __visible riscv: fp: add missing __user pointer annotations riscv: add missing header file includes riscv: mark some code and data as file-static riscv: init: merge split string literals in preprocessor directive riscv: add prototypes for assembly language functions from head.S
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- 01 Nov, 2019 9 commits
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Daniel Borkmann authored
Björn Töpel says: ==================== This set consists of three patches from Maciej and myself which are optimizing the XSKMAP lookups. In the first patch, the sockets are moved to be stored at the tail of the struct xsk_map. The second patch, Maciej implements map_gen_lookup() for XSKMAP. The third patch, introduced in this revision, moves various XSKMAP functions, to permit the compiler to do more aggressive inlining. Based on the XDP program from tools/lib/bpf/xsk.c where bpf_map_lookup_elem() is explicitly called, this work yields a 5% improvement for xdpsock's rxdrop scenario. The last patch yields 2% improvement. Jonathan's Acked-by: for patch 1 and 2 was carried on. Note that the overflow checks are done in the bpf_map_area_alloc() and bpf_map_charge_init() functions, which was fixed in commit ff1c08e1 ("bpf: Change size to u64 for bpf_map_{area_alloc, charge_init}()"). [1] https://patchwork.ozlabs.org/patch/1186170/ v1->v2: * Change size/cost to size_t and use {struct, array}_size where appropriate. (Jakub) v2->v3: * Proper commit message for patch 2. v3->v4: * Change size_t to u64 to handle 32-bit overflows. (Jakub) * Introduced patch 3. v4->v5: * Use BPF_SIZEOF size, instead of BPF_DW, for correct pointer-sized loads. (Daniel) ==================== Signed-off-by:
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Björn Töpel authored
In this commit the XSKMAP entry lookup function used by the XDP redirect code is moved from the xskmap.c file to the xdp_sock.h header, so the lookup can be inlined from, e.g., the bpf_xdp_redirect_map() function. Further the __xsk_map_redirect() and __xsk_map_flush() is moved to the xsk.c, which lets the compiler inline the xsk_rcv() and xsk_flush() functions. Finally, all the XDP socket functions were moved from linux/bpf.h to net/xdp_sock.h, where most of the XDP sockets functions are anyway. This yields a ~2% performance boost for the xdpsock "rx_drop" scenario. Signed-off-by:
Björn Töpel <bjorn.topel@intel.com> Signed-off-by:
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Maciej Fijalkowski authored
Inline the xsk_map_lookup_elem() via implementing the map_gen_lookup() callback. This results in emitting the bpf instructions in place of bpf_map_lookup_elem() helper call and better performance of bpf programs. Signed-off-by:
Maciej Fijalkowski <maciej.fijalkowski@intel.com> Signed-off-by:
Jonathan Lemon <jonathan.lemon@gmail.com> Link: https://lore.kernel.org/bpf/20191101110346.15004-3-bjorn.topel@gmail.com
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Björn Töpel authored
Prior this commit, the array storing XDP socket instances were stored in a separate allocated array of the XSKMAP. Now, we store the sockets as a flexible array member in a similar fashion as the arraymap. Doing so, we do less pointer chasing in the lookup. Signed-off-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linuxLinus Torvalds authored
Pull parisc fix from Helge Deller: "Fix a parisc kernel crash with ftrace functions when compiled without frame pointers" * 'parisc-5.4-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: fix frame pointer in ftrace_regs_caller()
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David S. Miller authored
Jakub Kicinski says: ==================== fix BPF offload related bugs test_offload.py catches some recently added bugs. First of a bug in test_offload.py itself after recent changes to netdevsim is fixed. Second patch fixes a bug in cls_bpf, and last one addresses a problem with the recently added XDP installation optimization. ==================== Signed-off-by: -
Jakub Kicinski authored
When netdevice with offloaded BPF programs is destroyed the programs are orphaned and removed from the program IDA - their IDs get released (the programs may remain accessible via existing open file descriptors and pinned files). After IDs are released they are set to 0. This confuses dev_change_xdp_fd() because it compares the __dev_xdp_query() result where 0 means no program with prog->aux->id where 0 means orphaned. dev_change_xdp_fd() would have incorrectly returned success even though it had not installed the program. Since drivers already catch this case via bpf_offload_dev_match() let them handle this case. The error message drivers produce in this case ("program loaded for a different device") is in fact correct as the orphaned program must had to be loaded for a different device. Fixes: c14a9f63 ("net: Don't call XDP_SETUP_PROG when nothing is changed") Signed-off-by:Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by:
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Jakub Kicinski authored
Commit 40119211 ("net: sched: refactor block offloads counter usage") missed the fact that either new prog or old prog may be NULL. Fixes: 40119211 ("net: sched: refactor block offloads counter usage") Signed-off-by:
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Jakub Kicinski authored
DebugFS for netdevsim now contains some "action trigger" files which are write only. Don't try to capture the contents of those. Note that we can't use os.access() because the script requires root. Fixes: 4418f862 ("netdevsim: implement support for devlink region and snapshots") Signed-off-by:
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