- 14 Jul, 2018 1 commit
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Jakub Kicinski authored
perf propagates its feature check results to libbpf. This means features for which perf probes must be a superset of libbpf's required features. perf depends on FEATURE_TESTS_BASIC for its list of features. commit 531b014e ("tools: bpf: make use of reallocarray") added reallocarray use to libbpf, make perf also perform the reallocarray feature check. Fixes: 531b014e ("tools: bpf: make use of reallocarray") Reported-by:
Guenter Roeck <linux@roeck-us.net> Signed-off-by:
Jakub Kicinski <jakub.kicinski@netronome.com> Tested-by:
Daniel Borkmann <daniel@iogearbox.net>
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- 13 Jul, 2018 14 commits
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Jesper Dangaard Brouer authored
People noticed that the code match on IEEE 802.1ad (ETH_P_8021AD) ethertype, and this implies Q-in-Q or double tagged VLANs. Thus, we better parse the next VLAN header too. It is even marked as a TODO. This is relevant for real world use-cases, as XDP cpumap redirect can be used when the NIC RSS hashing is broken. E.g. the ixgbe driver HW cannot handle double tagged VLAN packets, and places everything into a single RX queue. Using cpumap redirect, users can redistribute traffic across CPUs to solve this, which is faster than the network stacks RPS solution. It is left as an exerise how to distribute the packets across CPUs. It would be convenient to use the RX hash, but that is not _yet_ exposed to XDP programs. For now, users can code their own hash, as I've demonstrated in the Suricata code (where Q-in-Q is handled correctly). Reported-by:
Florian Maury <florian.maury-cv@x-cli.eu> Reported-by:
Marek Majkowski <marek@cloudflare.com> Signed-off-by:
Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by:
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Daniel Borkmann authored
Jakub Kicinski says: ==================== This set is adding support for loading driver and offload XDP at the same time. This enables advanced use cases where some of the work is offloaded to the NIC and some is done by the host. Separate netlink attributes are added for each mode of operation. Driver callbacks for offload are cleaned up a little, including removal of .prog_attached flag. ==================== Acked-by:
Alexei Starovoitov <ast@kernel.org> Signed-off-by:
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Jakub Kicinski authored
Split handling of offloaded and driver programs completely. Since offloaded programs always come with XDP_FLAGS_HW_MODE set in reality there could be no sharing, anyway, programs would only be installed in driver or in hardware. Splitting the handling allows us to install programs in HW and in driver at the same time. Signed-off-by:
Quentin Monnet <quentin.monnet@netronome.com> Signed-off-by:
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Jakub Kicinski authored
Add tests for having an XDP program attached in the driver and another one attached in HW simultaneously. Signed-off-by:
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Jakub Kicinski authored
Allow netdevsim to accept driver and offload attachment of XDP BPF programs at the same time. Signed-off-by:
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Jakub Kicinski authored
Split the query of HW-attached program from the software one. Introduce new .ndo_bpf command to query HW-attached program. This will allow drivers to install different programs in HW and SW at the same time. Netlink can now also carry multiple programs on dump (in which case mode will be set to XDP_ATTACHED_MULTI and user has to check per-attachment point attributes, IFLA_XDP_PROG_ID will not be present). We reuse IFLA_XDP_PROG_ID skb space for second mode, so rtnl_xdp_size() doesn't need to be updated. Note that the installation side is still not there, since all drivers currently reject installing more than one program at the time. Signed-off-by:
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Jakub Kicinski authored
Basic operations drivers perform during xdp setup and query can be moved to helpers in the core. Encapsulate program and flags into a structure and add helpers. Note that the structure is intended as the "main" program information source in the driver. Most drivers will additionally place the program pointer in their fast path or ring structures. The helpers don't have a huge impact now, but they will decrease the code duplication when programs can be installed in HW and driver at the same time. Encapsulating the basic operations in helpers will hopefully also reduce the number of changes to drivers which adopt them. Helpers could really be static inline, but they depend on definition of struct netdev_bpf which means they'd have to be placed in netdevice.h, an already 4500 line header. Signed-off-by:
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Jakub Kicinski authored
prog_attached of struct netdev_bpf should have been superseded by simply setting prog_id long time ago, but we kept it around to allow offloading drivers to communicate attachment mode (drv vs hw). Subsequently drivers were also allowed to report back attachment flags (prog_flags), and since nowadays only programs attached will XDP_FLAGS_HW_MODE can get offloaded, we can tell the attachment mode from the flags driver reports. Remove prog_attached member. Signed-off-by:
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Jakub Kicinski authored
In preparation for support of simultaneous driver and hardware XDP support add per-mode attributes. The catch-all IFLA_XDP_PROG_ID will still be reported, but user space can now also access the program ID in a new IFLA_XDP_<mode>_PROG_ID attribute. Signed-off-by:
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Daniel Borkmann authored
Russell King says: ==================== Four further jit compiler improves for 32-bit ARM. ==================== Signed-off-by: -
Russell King authored
Improbe the 64-bit ALU implementation from: movw r8, #65532 movt r8, #65535 movw r9, #65535 movt r9, #65535 ldr r7, [fp, #-44] adds r7, r7, r8 str r7, [fp, #-44] ldr r7, [fp, #-40] adc r7, r7, r9 str r7, [fp, #-40] to: movw r8, #65532 movt r8, #65535 movw r9, #65535 movt r9, #65535 ldrd r6, [fp, #-44] adds r6, r6, r8 adc r7, r7, r9 strd r6, [fp, #-44] Signed-off-by:
Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by:
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Russell King authored
Improve the 64-bit store implementation from: ldr r6, [fp, #-8] str r8, [r6] ldr r6, [fp, #-8] mov r7, #4 add r7, r6, r7 str r9, [r7] to: ldr r6, [fp, #-8] str r8, [r6] str r9, [r6, #4] We leave the store as two separate STR instructions rather than using STRD as the store may not be aligned, and STR can handle misalignment. Signed-off-by:
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Russell King authored
Improve the 64-bit sign-extended immediate from: mov r6, #1 str r6, [fp, #-52] ; 0xffffffcc mov r6, #0 str r6, [fp, #-48] ; 0xffffffd0 to: mov r6, #1 mov r7, #0 strd r6, [fp, #-52] ; 0xffffffcc Signed-off-by:
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Russell King authored
Rather than writing each 32-bit half of the 64-bit immediate value separately when the register is on the stack: movw r6, #45056 ; 0xb000 movt r6, #60979 ; 0xee33 str r6, [fp, #-44] ; 0xffffffd4 mov r6, #0 str r6, [fp, #-40] ; 0xffffffd8 arrange to use the double-word store when available instead: movw r6, #45056 ; 0xb000 movt r6, #60979 ; 0xee33 mov r7, #0 strd r6, [fp, #-44] ; 0xffffffd4 Signed-off-by:
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- 12 Jul, 2018 19 commits
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Daniel Borkmann authored
Russell King says: ==================== This series improves the ARM BPF JIT compiler by: - enumerating the stack layout rather than using constants that happen to be multiples of four - rejig the BPF "register" accesses to use negative numbers instead of positive, which could be confused with register numbers in the bpf2a32 array. - since we maintain the ARM FP register as a pointer to the top of our scratch space (or, with frame pointers enabled, a valid ARM frame pointer register), we can access our scratch space using FP, which is constant across all BPF programs, including tail-called programs. - use immediate forms of ARM instructions where possible, rather than first loading the immediate into an ARM register. - use load-with-shift instruction rather than seperate shift instruction followed by load - avoid reloading index and array in the tail-call code - use double-word load/store instructions where available Version 2: - Fix ARMv5 test pointed out by Olof - Fix build error found by 0-day (adding an additional patch) ==================== Signed-off-by: -
Russell King authored
Use double-word load and stores where support for this instruction is supported by the CPU architecture. Signed-off-by:
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Russell King authored
Always use an odd/even register pair for our 64-bit registers, so that we're able to use the double-word load/store instructions in the future. Signed-off-by:
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Russell King authored
Rearranging the order of the initial tail call code a little allows is to avoid reloading the 'array' pointer. Signed-off-by:
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Russell King authored
Avoid reloading 'index' after we have validated it - it remains in tmp2[1] up to the point that we begin the code to index the pointer array, so with a little rearrangement of the registers, we can use the already loaded value. Signed-off-by:
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Russell King authored
Rather than pre-shifting the rm register for the ldr in the tail call, shift it in the load instruction. This eliminates one unnecessary instruction. Signed-off-by:
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Russell King authored
Rather than moving constants to a register and then using them in a subsequent instruction, use them directly in the desired instruction cutting out the "middle" register. This removes two instructions from the tail call code path. Signed-off-by:
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Russell King authored
Provide a version of the imm8m() function that the compiler can optimise when used with a constant expression. Signed-off-by:
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Russell King authored
Access the eBPF scratch space using the frame pointer rather than our stack pointer, as the offsets from the ARM frame pointer are constant across all eBPF programs. Since we no longer reference the scratch space registers from the stack pointer, this simplifies emit_push_r64() as it no longer needs to know how many words are pushed onto the stack. Signed-off-by:
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Russell King authored
Provide a couple of 64-bit register accessors, and use them where appropriate Signed-off-by:
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Russell King authored
Many of the code paths need to have knowledge about whether a register is stacked or in a CPU register. Move this decision making to a pair of helper functions instead of having it scattered throughout the code. Signed-off-by:
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Russell King authored
The decision about whether a BPF register is on the stack or in a CPU register is detected at the top BPF insn processing level, and then percolated throughout the remainder of the code. Since we now use negative register values to represent stacked registers, we can detect where a BPF register is stored without restoring to carrying this additional metadata through all code paths. Signed-off-by:
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Russell King authored
Use negative numbers for eBPF registers that live on the stack. Signed-off-by:
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Russell King authored
Provide a set of load/store opcode generators that work with negative immediates as well as positive ones. Signed-off-by:
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Russell King authored
Enumerate the contents of the JIT scratch stack layout used for storing some of the JITs 64-bit registers, tail call counter and AX register. Signed-off-by:
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Daniel Borkmann authored
Quentin Monnet says: ==================== The three patches in this series are related to the documentation for eBPF helpers. The first patch brings minor formatting edits to the documentation in include/uapi/linux/bpf.h, and the second one updates the related header file under tools/. The third patch adds a Makefile under tools/bpf for generating the documentation (man pages) about eBPF helpers. The targets defined in this file can also be called from the bpftool directory (please refer to relevant commit logs for details). ==================== Signed-off-by: -
Quentin Monnet authored
Provide a new Makefile.helpers in tools/bpf, in order to build and install the man page for eBPF helpers. This Makefile is also included in the one used to build bpftool documentation, so that it can be called either on its own (cd tools/bpf && make -f Makefile.helpers) or from bpftool directory (cd tools/bpf/bpftool && make doc, or cd tools/bpf/bpftool/Documentation && make helpers). Makefile.helpers is not added directly to bpftool to avoid changing its Makefile too much (helpers are not 100% directly related with bpftool). But the possibility to build the page from bpftool directory makes us able to package the helpers man page with bpftool, and to install it along with bpftool documentation, so that the doc for helpers becomes easily available to developers through the "man" program. Cc: linux-man@vger.kernel.org Suggested-by:
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Quentin Monnet authored
Update with latest changes from include/uapi/linux/bpf.h header. Signed-off-by:
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Quentin Monnet authored
Minor formatting edits for eBPF helpers documentation, including blank lines removal, fix of item list for return values in bpf_fib_lookup(), and missing prefix on bpf_skb_load_bytes_relative(). Signed-off-by:
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- 11 Jul, 2018 6 commits
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Daniel Borkmann authored
Jakub Kicinski says: ==================== This series starts with two minor clean ups to test_offload.py selftest script. The next 11 patches extend the abilities of bpftool prog load beyond the simple cgroup use cases. Three new parameters are added: - type - allows specifying program type, independent of how code sections are named; - map - allows reusing existing maps, instead of creating a new map on every program load; - dev - offload/binding to a device. A number of changes to libbpf is required to accomplish the task. The section - program type logic mapping is exposed. We should probably aim to use the libbpf program section naming everywhere. For reuse of maps we need to allow users to set FD for bpf map object in libbpf. Examples Load program my_xdp.o and pin it as /sys/fs/bpf/my_xdp, for xdp program type: $ bpftool prog load my_xdp.o /sys/fs/bpf/my_xdp \ type xdp As above but for offload: $ bpftool prog load my_xdp.o /sys/fs/bpf/my_xdp \ type xdp \ dev netdevsim0 Load program my_maps.o, but for the first map reuse map id 17, and for the map called "other_map" reuse pinned map /sys/fs/bpf/map0: $ bpftool prog load my_maps.o /sys/fs/bpf/prog \ map idx 0 id 17 \ map name other_map pinned /sys/fs/bpf/map0 v3: - fix return codes in patch 5; - rename libbpf_prog_type_by_string() -> libbpf_prog_type_by_name(); - fold file path into xattr in patch 8; - add patch 10; - use dup3() in patch 12; - depend on fd value in patch 12; - close old fd in patch 12. v2: - add compat for reallocarray(). ==================== Signed-off-by: -
Jakub Kicinski authored
Add map parameter to prog load which will allow reuse of existing maps instead of creating new ones. We need feature detection and compat code for reallocarray, since it's not available in many libc versions. Signed-off-by:
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Jakub Kicinski authored
More advanced applications may want to only replace programs without destroying associated maps. Allow libbpf users to achieve that. Instead of always creating all of the maps at load time, expose to users an API to reconstruct the map object from already existing map. The map parameters are read from the kernel and replace the parameters of the ELF map. libbpf does not restrict the map replacement, i.e. the reused map does not have to be compatible with the ELF map definition. We relay on the verifier for checking the compatibility between maps and programs. The ELF map definition is completely overwritten by the information read from the kernel, to make sure libbpf's view of map object corresponds to the actual map. Signed-off-by:
Andrey Ignatov <rdna@fb.com> Signed-off-by:
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Jakub Kicinski authored
reallocarray() is a safer variant of realloc which checks for multiplication overflow in case of array allocation. Since it's not available in Glibc < 2.26 import kernel's overflow.h and add a static inline implementation when needed. Use feature detection to probe for existence of reallocarray. Signed-off-by:
Jiong Wang <jiong.wang@netronome.com> Signed-off-by:
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Jakub Kicinski authored
libbpf_strerror() depends on XSI-compliant (POSIX) version of strerror_r(), which prevents us from using GNU-extensions in libbpf.c, like reallocarray() or dup3(). Move error printing code into a separate file to allow it to continue using POSIX strerror_r(). No functional changes. Signed-off-by:
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Jakub Kicinski authored
bpf_prog_load() is a very useful helper but it doesn't give us full flexibility of modifying the BPF objects before loading. Open code bpf_prog_load() in bpftool so we can add extra logic in following commits. Signed-off-by:
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