Yonghong Song 248010d2fd bpf: Implement bpf_seq_read() for bpf iterator ... [upstream commit fd4f12bc38c3ad9107169e7c9e6e7f81d93dda97] bpf iterator uses seq_file to provide a lossless way to transfer data to user space. But we want to call bpf program after all objects have been traversed, and bpf program may write additional data to the seq_file buffer. The current seq_read() does not work for this use case. Besides allowing stop() function to write to the buffer, the bpf_seq_read() also fixed the buffer size to one page. If any single call of show() or stop() will emit data more than one page to cause overflow, -E2BIG error code will be returned to user space. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20200509175904.2475468-1-yhs@fb.com		2022-06-21 10:27:11 +08:00
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Makefile	bpf: Implement an interface to register bpf_iter targets	2022-06-21 10:27:11 +08:00
arraymap.c	bpf: Simplify __bpf_arch_text_poke poke type handling	2022-06-21 10:27:06 +08:00
bpf_iter.c	bpf: Implement bpf_seq_read() for bpf iterator	2022-06-21 10:27:11 +08:00
bpf_lru_list.c	bpf_lru_list: Read double-checked variable once without lock	2021-04-12 12:52:15 +08:00
bpf_lru_list.h	Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces.	2021-03-16 11:01:34 +08:00
bpf_lsm.c	bpf: lsm: Implement attach, detach and execution	2022-06-21 10:27:08 +08:00
bpf_struct_ops.c	bpf: Refactor trampoline update code	2022-06-21 10:27:07 +08:00
bpf_struct_ops_types.h	bpf: tcp: Support tcp_congestion_ops in bpf	2022-06-21 10:27:05 +08:00
btf.c	bpf: Add support for BPF_OBJ_GET_INFO_BY_FD for bpf_link	2022-06-21 10:27:09 +08:00
cgroup.c	bpf, cgroup: Return ENOLINK for auto-detached links on update	2022-06-21 10:27:09 +08:00
core.c	bpf, netns: Handle multiple link attachments	2022-06-21 10:27:10 +08:00
cpumap.c	cpumap: Avoid warning when CONFIG_DEBUG_PER_CPU_MAPS is enabled	2021-03-16 16:27:10 +08:00
devmap.c	devmap: Use bpf_map_area_alloc() for allocating hash buckets	2021-03-16 16:30:57 +08:00
disasm.c	bpf: Introduce BPF nospec instruction for mitigating Spectre v4	2022-06-21 10:27:02 +08:00
disasm.h	Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces.	2021-03-16 11:01:34 +08:00
dispatcher.c	bpf: Introduce BPF dispatcher	2022-06-21 10:27:06 +08:00
hashtab.c	bpf: Factor out hashtab bucket lock operations	2022-06-21 10:27:08 +08:00
helpers.c	bpf: Fix helper bpf_map_peek_elem_proto pointing to wrong callback	2021-03-16 16:44:00 +08:00
inode.c	bpf: Introduce pinnable bpf_link abstraction	2022-06-21 10:27:08 +08:00
local_storage.c	Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces.	2021-03-16 11:01:34 +08:00
lpm_trie.c	Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces.	2021-03-16 11:01:34 +08:00
map_in_map.c	bpf: Move owner type, jited info into array auxiliary data	2022-06-21 10:27:05 +08:00
map_in_map.h	Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces.	2021-03-16 11:01:34 +08:00
net_namespace.c	inet: Run SK_LOOKUP BPF program on socket lookup	2022-06-21 10:27:10 +08:00
offload.c	Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces.	2021-03-16 11:01:34 +08:00
percpu_freelist.c	Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces.	2021-03-16 11:01:34 +08:00
percpu_freelist.h	Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces.	2021-03-16 11:01:34 +08:00
queue_stack_maps.c	Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces.	2021-03-16 11:01:34 +08:00
reuseport_array.c	net: Generate reuseport group ID on group creation	2022-06-21 10:27:07 +08:00
stackmap.c	bpf: Check for integer overflow when using roundup_pow_of_two()	2021-04-12 12:52:03 +08:00
syscall.c	bpf: Support bpf tracing/iter programs for BPF_LINK_CREATE	2022-06-21 10:27:11 +08:00
sysfs_btf.c	bpf: Fix sysfs export of empty BTF section	2021-03-16 16:37:55 +08:00
tnum.c	Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces.	2021-03-16 11:01:34 +08:00
trampoline.c	bpf: lsm: Implement attach, detach and execution	2022-06-21 10:27:08 +08:00
verifier.c	bpf: Allow loading of a bpf_iter program	2022-06-21 10:27:11 +08:00
xskmap.c	bpf: Implement map_gen_lookup() callback for XSKMAP	2022-06-21 10:27:03 +08:00