mirror-linux/kernel/bpf
Jason Xing 5942246426 bpf: Support selective sampling for bpf timestamping
Add the bpf_sock_ops_enable_tx_tstamp kfunc to allow BPF programs to
selectively enable TX timestamping on a skb during tcp_sendmsg().

For example, BPF program will limit tracking X numbers of packets
and then will stop there instead of tracing all the sendmsgs of
matched flow all along. It would be helpful for users who cannot
afford to calculate latencies from every sendmsg call probably
due to the performance or storage space consideration.

Signed-off-by: Jason Xing <kerneljasonxing@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250220072940.99994-12-kerneljasonxing@gmail.com
2025-02-20 14:30:02 -08:00
..
preload
Kconfig bpf: remove CONFIG_BPF_JIT dependency on CONFIG_MODULES of 2024-05-14 00:36:29 -07:00
Makefile bpf: Avoid deadlock caused by nested kprobe and fentry bpf programs 2024-12-14 09:49:27 -08:00
arena.c The various patchsets are summarized below. Plus of course many 2025-01-26 18:36:23 -08:00
arraymap.c bpf: Remove migrate_{disable|enable} in ->map_for_each_callback 2025-01-08 18:06:35 -08:00
bloom_filter.c bpf: Check bloom filter map value size 2024-03-27 09:56:17 -07:00
bpf_cgrp_storage.c bpf: Remove migrate_{disable|enable} from bpf_cgrp_storage_lock helpers 2025-01-08 18:06:36 -08:00
bpf_inode_storage.c bpf: Disable migration when destroying inode storage 2025-01-08 18:06:36 -08:00
bpf_iter.c [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
bpf_local_storage.c bpf: Remove migrate_{disable|enable} from bpf_selem_free() 2025-01-08 18:06:37 -08:00
bpf_lru_list.c
bpf_lru_list.h
bpf_lsm.c bpf, lsm: Remove getlsmprop hooks BTF IDs 2024-11-25 14:14:17 -08:00
bpf_struct_ops.c bpf: Reject struct_ops registration that uses module ptr and the module btf_id is missing 2025-01-03 10:16:46 -08:00
bpf_task_storage.c bpf: Remove migrate_{disable|enable} from bpf_task_storage_lock helpers 2025-01-08 18:06:36 -08:00
btf.c bpf: Support selective sampling for bpf timestamping 2025-02-20 14:30:02 -08:00
btf_iter.c bpf: Remove custom build rule 2024-08-30 08:55:26 -07:00
btf_relocate.c bpf: Remove custom build rule 2024-08-30 08:55:26 -07:00
cgroup.c Summary 2024-11-22 20:36:11 -08:00
cgroup_iter.c
core.c bpf: fix potential error return 2024-12-10 11:17:53 -08:00
cpumap.c xdp: get rid of xdp_frame::mem.id 2024-12-12 18:22:52 -08:00
cpumask.c bpf: Remove migrate_{disable,enable} in bpf_cpumask_release() 2025-01-08 18:06:37 -08:00
crypto.c bpf: crypto: make state and IV dynptr nullable 2024-06-13 16:33:04 -07:00
devmap.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-12-12 14:19:05 -08:00
disasm.c bpf: add special internal-only MOV instruction to resolve per-CPU addrs 2024-04-03 10:29:55 -07:00
disasm.h
dispatcher.c bpf: Add kernel symbol for struct_ops trampoline 2024-11-12 17:13:46 -08:00
hashtab.c bpf: Free element after unlock in __htab_map_lookup_and_delete_elem() 2025-01-20 09:09:01 -08:00
helpers.c bpf: Cancel the running bpf_timer through kworker for PREEMPT_RT 2025-01-20 09:09:01 -08:00
inode.c bpf: Preserve param->string when parsing mount options 2024-10-22 12:56:38 -07:00
kmem_cache_iter.c bpf: Add open coded version of kmem_cache iterator 2024-11-01 11:08:32 -07:00
link_iter.c
local_storage.c bpf: Replace 8 seq_puts() calls by seq_putc() calls 2024-07-29 12:53:00 -07:00
log.c bpf: Introduce support for bpf_local_irq_{save,restore} 2024-12-04 08:38:29 -08:00
lpm_trie.c bpf: Remove migrate_{disable|enable} from LPM trie 2025-01-08 18:06:35 -08:00
map_in_map.c bpf: switch maps to CLASS(fd, ...) 2024-08-13 15:58:17 -07:00
map_in_map.h bpf: Add map and need_defer parameters to .map_fd_put_ptr() 2023-12-04 17:50:26 -08:00
map_iter.c bpf: treewide: Annotate BPF kfuncs in BTF 2024-01-31 20:40:56 -08:00
memalloc.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2024-11-13 12:52:51 -08:00
mmap_unlock_work.h
mprog.c
net_namespace.c
offload.c
percpu_freelist.c
percpu_freelist.h
prog_iter.c
queue_stack_maps.c
range_tree.c bpf: Disable migration before calling ops->map_free() 2025-01-08 18:06:36 -08:00
range_tree.h bpf: Introduce range_tree data structure and use it in bpf arena 2024-11-13 13:52:45 -08:00
relo_core.c bpf: Remove custom build rule 2024-08-30 08:55:26 -07:00
reuseport_array.c bpf: Use sockfd_put() helper 2024-08-30 08:57:47 -07:00
ringbuf.c bpf: Add MEM_WRITE attribute 2024-10-22 15:42:56 -07:00
stackmap.c bpf: wire up sleepable bpf_get_stack() and bpf_get_task_stack() helpers 2024-09-11 09:58:31 -07:00
syscall.c treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
sysfs_btf.c btf: Switch vmlinux BTF attribute to sysfs_bin_attr_simple_read() 2025-01-09 10:44:06 +01:00
task_iter.c vfs-6.13.file 2024-11-18 10:30:29 -08:00
tcx.c
tnum.c bpf: simplify tnum output if a fully known constant 2023-12-02 11:36:51 -08:00
token.c remove pointless includes of <linux/fdtable.h> 2024-10-07 13:34:41 -04:00
trampoline.c bpf: Add kernel symbol for struct_ops trampoline 2024-11-12 17:13:46 -08:00
verifier.c bpf-next-6.14 2025-01-23 08:04:07 -08:00