Mauricio Vasquez B f1a2e44a3a bpf: add queue and stack maps ... Queue/stack maps implement a FIFO/LIFO data storage for ebpf programs. These maps support peek, pop and push operations that are exposed to eBPF programs through the new bpf_map[peek/pop/push] helpers. Those operations are exposed to userspace applications through the already existing syscalls in the following way: BPF_MAP_LOOKUP_ELEM -> peek BPF_MAP_LOOKUP_AND_DELETE_ELEM -> pop BPF_MAP_UPDATE_ELEM -> push Queue/stack maps are implemented using a buffer, tail and head indexes, hence BPF_F_NO_PREALLOC is not supported. As opposite to other maps, queue and stack do not use RCU for protecting maps values, the bpf_map[peek/pop] have a ARG_PTR_TO_UNINIT_MAP_VALUE argument that is a pointer to a memory zone where to save the value of a map. Basically the same as ARG_PTR_TO_UNINIT_MEM, but the size has not be passed as an extra argument. Our main motivation for implementing queue/stack maps was to keep track of a pool of elements, like network ports in a SNAT, however we forsee other use cases, like for exampling saving last N kernel events in a map and then analysing from userspace. Signed-off-by: Mauricio Vasquez B <mauricio.vasquez@polito.it> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2018-10-19 13:24:31 -07:00
..
arraymap.c	bpf: return EOPNOTSUPP when map lookup isn't supported	2018-10-09 21:52:20 -07:00
bpf_lru_list.c	bpf: lru: Lower the PERCPU_NR_SCANS from 16 to 4	2017-04-17 13:55:52 -04:00
bpf_lru_list.h	bpf: Only set node->ref = 1 if it has not been set	2017-09-01 09:57:39 -07:00
btf.c	bpf: btf: Fix a missing check bug	2018-10-09 21:42:51 -07:00
cgroup.c	bpf: extend cgroup bpf core to allow multiple cgroup storage types	2018-10-01 16:18:32 +02:00
core.c	bpf: add queue and stack maps	2018-10-19 13:24:31 -07:00
cpumap.c	bpf: fix redirect to map under tail calls	2018-08-17 15:56:23 -07:00
devmap.c	bpf: fix redirect to map under tail calls	2018-08-17 15:56:23 -07:00
disasm.c	bpf: Remove struct bpf_verifier_env argument from print_bpf_insn	2018-03-23 17:38:57 +01:00
disasm.h	bpf: Remove struct bpf_verifier_env argument from print_bpf_insn	2018-03-23 17:38:57 +01:00
hashtab.c	bpf: add bpffs pretty print for percpu arraymap/hash/lru_hash	2018-08-30 14:03:53 +02:00
helpers.c	bpf: add queue and stack maps	2018-10-19 13:24:31 -07:00
inode.c	bpf: decouple btf from seq bpf fs dump and enable more maps	2018-08-13 00:52:45 +02:00
local_storage.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next	2018-10-08 23:42:44 -07:00
lpm_trie.c	bpf: decouple btf from seq bpf fs dump and enable more maps	2018-08-13 00:52:45 +02:00
Makefile	bpf: add queue and stack maps	2018-10-19 13:24:31 -07:00
map_in_map.c	bpf: don't allow create maps of per-cpu cgroup local storages	2018-10-01 16:18:33 +02:00
map_in_map.h	bpf: Add syscall lookup support for fd array and htab	2017-06-29 13:13:25 -04:00
offload.c	bpf: add verifier callback to get stack usage info for offloaded progs	2018-10-08 10:24:12 +02:00
percpu_freelist.c	bpf: fix lockdep splat	2017-11-15 19:46:32 +09:00
percpu_freelist.h	bpf: introduce percpu_freelist	2016-03-08 15:28:31 -05:00
queue_stack_maps.c	bpf: add queue and stack maps	2018-10-19 13:24:31 -07:00
reuseport_array.c	bpf: Introduce BPF_MAP_TYPE_REUSEPORT_SOCKARRAY	2018-08-11 01:58:46 +02:00
stackmap.c	bpf: rename stack trace map operations	2018-10-19 13:24:30 -07:00
syscall.c	bpf: add queue and stack maps	2018-10-19 13:24:31 -07:00
tnum.c	bpf/verifier: improve register value range tracking with ARSH	2018-04-29 08:45:53 -07:00
verifier.c	bpf: add queue and stack maps	2018-10-19 13:24:31 -07:00
xskmap.c	bpf: return EOPNOTSUPP when map lookup isn't supported	2018-10-09 21:52:20 -07:00