* [PATCH v5 0/2] Fix two tailcall-related issues
@ 2025-07-31 7:50 Haoran Jiang
2025-07-31 7:50 ` [PATCH v5 1/2] LoongArch: BPF: Fix jump offset calculation in tailcall Haoran Jiang
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Haoran Jiang @ 2025-07-31 7:50 UTC (permalink / raw)
To: loongarch
Cc: bpf, kernel, chenhuacai, hengqi.chen, yangtiezhu, jolsa, haoluo,
sdf, kpsingh, john.fastabend, yonghong.song, song, eddyz87,
martin.lau, andrii, daniel, ast
v5:
1,The format and comments have been modified.
v4:
1,There is a conflict when merging these two patches on the basis of the trampoline series patches, resolve the conflict issue.
v3:
1,In the prepare_bpf_tail_call_cnt function, emit_tailcall_jmp is replaced with emit_cond_jmp.
2,Fix the issue where test cases using fentry/fexit fail.
Test after merging these two patches and the following trampoline series patches.
https://lore.kernel.org/loongarch/CAK3+h2zirm6cV2tAbd38RSYSF3=B1qZ+9jm_GZPsAPrMtaozmg@mail.gmail.com/T/#mf1f1c9f965d5229c6d2dce3b1ca8bc9a5d70520d
./test_progs -a tailcalls
#413/1 tailcalls/tailcall_1:OK
#413/2 tailcalls/tailcall_2:OK
#413/3 tailcalls/tailcall_3:OK
#413/4 tailcalls/tailcall_4:OK
#413/5 tailcalls/tailcall_5:OK
#413/6 tailcalls/tailcall_6:OK
#413/7 tailcalls/tailcall_bpf2bpf_1:OK
#413/8 tailcalls/tailcall_bpf2bpf_2:OK
#413/9 tailcalls/tailcall_bpf2bpf_3:OK
#413/10 tailcalls/tailcall_bpf2bpf_4:OK
#413/11 tailcalls/tailcall_bpf2bpf_5:OK
#413/12 tailcalls/tailcall_bpf2bpf_6:OK
#413/13 tailcalls/tailcall_bpf2bpf_fentry:OK
#413/14 tailcalls/tailcall_bpf2bpf_fexit:OK
#413/15 tailcalls/tailcall_bpf2bpf_fentry_fexit:OK
#413/16 tailcalls/tailcall_bpf2bpf_fentry_entry:OK
#413/17 tailcalls/tailcall_poke:OK
#413/18 tailcalls/tailcall_bpf2bpf_hierarchy_1:OK
#413/19 tailcalls/tailcall_bpf2bpf_hierarchy_fentry:OK
#413/20 tailcalls/tailcall_bpf2bpf_hierarchy_fexit:OK
#413/21 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_fexit:OK
#413/22 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_entry:OK
#413/23 tailcalls/tailcall_bpf2bpf_hierarchy_2:OK
#413/24 tailcalls/tailcall_bpf2bpf_hierarchy_3:OK
#413/25 tailcalls/tailcall_freplace:OK
#413/26 tailcalls/tailcall_bpf2bpf_freplace:OK
#413/27 tailcalls/tailcall_failure:OK
#413/28 tailcalls/reject_tail_call_spin_lock:OK
#413/29 tailcalls/reject_tail_call_rcu_lock:OK
#413/30 tailcalls/reject_tail_call_preempt_lock:OK
#413/31 tailcalls/reject_tail_call_ref:OK
#413 tailcalls:OK
Summary: 1/31 PASSED, 0 SKIPPED, 0 FAILED
v2:
1,Add a Fixes tag.
2,Ctx as the first parameter of emit_bpf_tail_call.
3,Define jmp_offset as a macro in emit_bpf_tail_call.
After merging these two patches, the test results are as follows:
./test_progs --allow=tailcalls
tester_init:PASS:tester_log_buf 0 nsec
process_subtest:PASS:obj_open_mem 0 nsec
process_subtest:PASS:specs_alloc 0 nsec
#413/1 tailcalls/tailcall_1:OK
#413/2 tailcalls/tailcall_2:OK
#413/3 tailcalls/tailcall_3:OK
#413/4 tailcalls/tailcall_4:OK
#413/5 tailcalls/tailcall_5:OK
#413/6 tailcalls/tailcall_6:OK
#413/7 tailcalls/tailcall_bpf2bpf_1:OK
#413/8 tailcalls/tailcall_bpf2bpf_2:OK
#413/9 tailcalls/tailcall_bpf2bpf_3:OK
#413/10 tailcalls/tailcall_bpf2bpf_4:OK
#413/11 tailcalls/tailcall_bpf2bpf_5:OK
#413/12 tailcalls/tailcall_bpf2bpf_6:OK
test_tailcall_count:PASS:open fentry_obj file 0 nsec
test_tailcall_count:PASS:find fentry prog 0 nsec
test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
test_tailcall_count:PASS:load fentry_obj 0 nsec
libbpf: prog 'fentry': failed to attach: -ENOTSUPP
test_tailcall_count:FAIL:attach_trace unexpected error: -524
#413/13 tailcalls/tailcall_bpf2bpf_fentry:FAIL
test_tailcall_count:PASS:open fexit_obj file 0 nsec
test_tailcall_count:PASS:find fexit prog 0 nsec
test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
test_tailcall_count:PASS:load fexit_obj 0 nsec
libbpf: prog 'fexit': failed to attach: -ENOTSUPP
test_tailcall_count:FAIL:attach_trace unexpected error: -524
#413/14 tailcalls/tailcall_bpf2bpf_fexit:FAIL
test_tailcall_count:PASS:open fentry_obj file 0 nsec
test_tailcall_count:PASS:find fentry prog 0 nsec
test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
test_tailcall_count:PASS:load fentry_obj 0 nsec
libbpf: prog 'fentry': failed to attach: -ENOTSUPP
test_tailcall_count:FAIL:attach_trace unexpected error: -524
#413/15 tailcalls/tailcall_bpf2bpf_fentry_fexit:FAIL
test_tailcall_bpf2bpf_fentry_entry:PASS:load tgt_obj 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:find jmp_table map 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:find jmp_table map fd 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:find classifier_0 prog 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:find classifier_0 prog fd 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:update jmp_table 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:open fentry_obj file 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:find fentry prog 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:set_attach_target classifier_0 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:load fentry_obj 0 nsec
libbpf: prog 'fentry': failed to attach: -ENOTSUPP
test_tailcall_bpf2bpf_fentry_entry:FAIL:attach_trace unexpected error: -524
#413/16 tailcalls/tailcall_bpf2bpf_fentry_entry:FAIL
#413/17 tailcalls/tailcall_poke:OK
#413/18 tailcalls/tailcall_bpf2bpf_hierarchy_1:OK
test_tailcall_hierarchy_count:PASS:load obj 0 nsec
test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
libbpf: prog 'fentry': failed to attach: -ENOTSUPP
test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
#413/19 tailcalls/tailcall_bpf2bpf_hierarchy_fentry:FAIL
test_tailcall_hierarchy_count:PASS:load obj 0 nsec
test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
test_tailcall_hierarchy_count:PASS:open fexit_obj file 0 nsec
test_tailcall_hierarchy_count:PASS:find fexit prog 0 nsec
test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
test_tailcall_hierarchy_count:PASS:load fexit_obj 0 nsec
libbpf: prog 'fexit': failed to attach: -ENOTSUPP
test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
#413/20 tailcalls/tailcall_bpf2bpf_hierarchy_fexit:FAIL
test_tailcall_hierarchy_count:PASS:load obj 0 nsec
test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
libbpf: prog 'fentry': failed to attach: -ENOTSUPP
test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
#413/21 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_fexit:FAIL
test_tailcall_hierarchy_count:PASS:load obj 0 nsec
test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
test_tailcall_hierarchy_count:PASS:set_attach_target entry 0 nsec
test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
libbpf: prog 'fentry': failed to attach: -ENOTSUPP
test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
tester_init:PASS:tester_log_buf 0 nsec
process_subtest:PASS:obj_open_mem 0 nsec
process_subtest:PASS:specs_alloc 0 nsec
#413/22 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_entry:FAIL
#413/23 tailcalls/tailcall_bpf2bpf_hierarchy_2:OK
#413/24 tailcalls/tailcall_bpf2bpf_hierarchy_3:OK
test_tailcall_freplace:PASS:tailcall_freplace__open 0 nsec
test_tailcall_freplace:PASS:tc_bpf2bpf__open_and_load 0 nsec
test_tailcall_freplace:PASS:set_attach_target 0 nsec
test_tailcall_freplace:PASS:tailcall_freplace__load 0 nsec
test_tailcall_freplace:PASS:update jmp_table failure 0 nsec
libbpf: prog 'entry_freplace': failed to attach to freplace: -ENOTSUPP
test_tailcall_freplace:FAIL:attach_freplace unexpected error: -524
#413/25 tailcalls/tailcall_freplace:FAIL
test_tailcall_bpf2bpf_freplace:PASS:tc_bpf2bpf__open_and_load 0 nsec
test_tailcall_bpf2bpf_freplace:PASS:tailcall_freplace__open 0 nsec
test_tailcall_bpf2bpf_freplace:PASS:set_attach_target 0 nsec
test_tailcall_bpf2bpf_freplace:PASS:tailcall_freplace__load 0 nsec
libbpf: prog 'entry_freplace': failed to attach to freplace: -ENOTSUPP
test_tailcall_bpf2bpf_freplace:FAIL:attach_freplace unexpected error: -524
#413/26 tailcalls/tailcall_bpf2bpf_freplace:FAIL
#413/27 tailcalls/tailcall_failure:OK
#413/28 tailcalls/reject_tail_call_spin_lock:OK
#413/29 tailcalls/reject_tail_call_rcu_lock:OK
#413/30 tailcalls/reject_tail_call_preempt_lock:OK
#413/31 tailcalls/reject_tail_call_ref:OK
#413 tailcalls:FAIL
All error logs:
tester_init:PASS:tester_log_buf 0 nsec
process_subtest:PASS:obj_open_mem 0 nsec
process_subtest:PASS:specs_alloc 0 nsec
test_tailcall_count:PASS:open fentry_obj file 0 nsec
test_tailcall_count:PASS:find fentry prog 0 nsec
test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
test_tailcall_count:PASS:load fentry_obj 0 nsec
libbpf: prog 'fentry': failed to attach: -ENOTSUPP
test_tailcall_count:FAIL:attach_trace unexpected error: -524
#413/13 tailcalls/tailcall_bpf2bpf_fentry:FAIL
test_tailcall_count:PASS:open fexit_obj file 0 nsec
test_tailcall_count:PASS:find fexit prog 0 nsec
test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
test_tailcall_count:PASS:load fexit_obj 0 nsec
libbpf: prog 'fexit': failed to attach: -ENOTSUPP
test_tailcall_count:FAIL:attach_trace unexpected error: -524
#413/14 tailcalls/tailcall_bpf2bpf_fexit:FAIL
test_tailcall_count:PASS:open fentry_obj file 0 nsec
test_tailcall_count:PASS:find fentry prog 0 nsec
test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
test_tailcall_count:PASS:load fentry_obj 0 nsec
libbpf: prog 'fentry': failed to attach: -ENOTSUPP
test_tailcall_count:FAIL:attach_trace unexpected error: -524
#413/15 tailcalls/tailcall_bpf2bpf_fentry_fexit:FAIL
test_tailcall_bpf2bpf_fentry_entry:PASS:load tgt_obj 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:find jmp_table map 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:find jmp_table map fd 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:find classifier_0 prog 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:find classifier_0 prog fd 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:update jmp_table 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:open fentry_obj file 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:find fentry prog 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:set_attach_target classifier_0 0 nsec
test_tailcall_bpf2bpf_fentry_entry:PASS:load fentry_obj 0 nsec
libbpf: prog 'fentry': failed to attach: -ENOTSUPP
test_tailcall_bpf2bpf_fentry_entry:FAIL:attach_trace unexpected error: -524
#413/16 tailcalls/tailcall_bpf2bpf_fentry_entry:FAIL
test_tailcall_hierarchy_count:PASS:load obj 0 nsec
test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
libbpf: prog 'fentry': failed to attach: -ENOTSUPP
test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
#413/19 tailcalls/tailcall_bpf2bpf_hierarchy_fentry:FAIL
test_tailcall_hierarchy_count:PASS:load obj 0 nsec
test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
test_tailcall_hierarchy_count:PASS:open fexit_obj file 0 nsec
test_tailcall_hierarchy_count:PASS:find fexit prog 0 nsec
test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
test_tailcall_hierarchy_count:PASS:load fexit_obj 0 nsec
libbpf: prog 'fexit': failed to attach: -ENOTSUPP
test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
#413/20 tailcalls/tailcall_bpf2bpf_hierarchy_fexit:FAIL
test_tailcall_hierarchy_count:PASS:load obj 0 nsec
test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
libbpf: prog 'fentry': failed to attach: -ENOTSUPP
test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
#413/21 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_fexit:FAIL
test_tailcall_hierarchy_count:PASS:load obj 0 nsec
test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
test_tailcall_hierarchy_count:PASS:set_attach_target entry 0 nsec
test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
libbpf: prog 'fentry': failed to attach: -ENOTSUPP
test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
tester_init:PASS:tester_log_buf 0 nsec
process_subtest:PASS:obj_open_mem 0 nsec
process_subtest:PASS:specs_alloc 0 nsec
#413/22 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_entry:FAIL
test_tailcall_freplace:PASS:tailcall_freplace__open 0 nsec
test_tailcall_freplace:PASS:tc_bpf2bpf__open_and_load 0 nsec
test_tailcall_freplace:PASS:set_attach_target 0 nsec
test_tailcall_freplace:PASS:tailcall_freplace__load 0 nsec
test_tailcall_freplace:PASS:update jmp_table failure 0 nsec
libbpf: prog 'entry_freplace': failed to attach to freplace: -ENOTSUPP
test_tailcall_freplace:FAIL:attach_freplace unexpected error: -524
#413/25 tailcalls/tailcall_freplace:FAIL
test_tailcall_bpf2bpf_freplace:PASS:tc_bpf2bpf__open_and_load 0 nsec
test_tailcall_bpf2bpf_freplace:PASS:tailcall_freplace__open 0 nsec
test_tailcall_bpf2bpf_freplace:PASS:set_attach_target 0 nsec
test_tailcall_bpf2bpf_freplace:PASS:tailcall_freplace__load 0 nsec
libbpf: prog 'entry_freplace': failed to attach to freplace: -ENOTSUPP
test_tailcall_bpf2bpf_freplace:FAIL:attach_freplace unexpected error: -524
#413/26 tailcalls/tailcall_bpf2bpf_freplace:FAIL
#413 tailcalls:FAIL
Summary: 0/21 PASSED, 0 SKIPPED, 1 FAILED
v1:
1,Fix the jmp_offset calculation error in the emit_bpf_tail_call function.
2,Fix the issue that MAX_TAIL_CALL_CNT limit bypass in hybrid tailcall and BPF-to-BPF call
After applying this patch, testing results are as follows:
./test_progs --allow=tailcalls/tailcall_bpf2bpf_hierarchy_1
413/18 tailcalls/tailcall_bpf2bpf_hierarchy_1:OK
413 tailcalls:OK
Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED
./test_progs --allow=tailcalls/tailcall_bpf2bpf_hierarchy_2
413/23 tailcalls/tailcall_bpf2bpf_hierarchy_2:OK
413 tailcalls:OK
Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED
./test_progs --allow=tailcalls/tailcall_bpf2bpf_hierarchy_3
413/24 tailcalls/tailcall_bpf2bpf_hierarchy_3:OK
413 tailcalls:OK
Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED
Haoran Jiang (2):
LoongArch: BPF: Fix jump offset calculation in tailcall
LoongArch: BPF: Fix tailcall hierarchy
arch/loongarch/net/bpf_jit.c | 171 ++++++++++++++++++++++-------------
1 file changed, 110 insertions(+), 61 deletions(-)
--
2.43.0
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v5 1/2] LoongArch: BPF: Fix jump offset calculation in tailcall
2025-07-31 7:50 [PATCH v5 0/2] Fix two tailcall-related issues Haoran Jiang
@ 2025-07-31 7:50 ` Haoran Jiang
2025-07-31 7:50 ` [PATCH v5 2/2] LoongArch: BPF: Fix tailcall hierarchy Haoran Jiang
2025-08-03 14:25 ` [PATCH v5 0/2] Fix two tailcall-related issues Huacai Chen
2 siblings, 0 replies; 6+ messages in thread
From: Haoran Jiang @ 2025-07-31 7:50 UTC (permalink / raw)
To: loongarch
Cc: bpf, kernel, chenhuacai, hengqi.chen, yangtiezhu, jolsa, haoluo,
sdf, kpsingh, john.fastabend, yonghong.song, song, eddyz87,
martin.lau, andrii, daniel, ast
The extra pass of bpf_int_jit_compile() skips JIT context initialization
which essentially skips offset calculation leaving out_offset = -1,
the jmp_offset in emit_bpf_tail_call is calculated
by #define jmp_offset (out_offset - (cur_offset)) is a negative number,
which is wrong. The final generated assembly as follow.
54: bgeu $a2, $t1, -8 # 0x0000004c
58: addi.d $a6, $s5, -1
5c: bltz $a6, -16 # 0x0000004c
60: alsl.d $t2, $a2, $a1, 0x3
64: ld.d $t2, $t2, 264
68: beq $t2, $zero, -28 # 0x0000004c
Before apply this patch, the follow test case will reveal soft lock issues.
cd tools/testing/selftests/bpf/
./test_progs --allow=tailcalls/tailcall_bpf2bpf_1
dmesg:
watchdog: BUG: soft lockup - CPU#2 stuck for 26s! [test_progs:25056]
Fixes: 5dc615520c4d ("LoongArch: Add BPF JIT support")
Reviewed-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Haoran Jiang <jianghaoran@kylinos.cn>
---
arch/loongarch/net/bpf_jit.c | 21 ++++++---------------
1 file changed, 6 insertions(+), 15 deletions(-)
diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.c
index 725c2d5ee82b..3f855d87eee3 100644
--- a/arch/loongarch/net/bpf_jit.c
+++ b/arch/loongarch/net/bpf_jit.c
@@ -223,9 +223,7 @@ bool bpf_jit_supports_far_kfunc_call(void)
return true;
}
-/* initialized on the first pass of build_body() */
-static int out_offset = -1;
-static int emit_bpf_tail_call(struct jit_ctx *ctx)
+static int emit_bpf_tail_call(struct jit_ctx *ctx, int insn)
{
int off;
u8 tcc = tail_call_reg(ctx);
@@ -235,9 +233,10 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx)
u8 t2 = LOONGARCH_GPR_T2;
u8 t3 = LOONGARCH_GPR_T3;
const int idx0 = ctx->idx;
+ int tc_ninsn = 0;
#define cur_offset (ctx->idx - idx0)
-#define jmp_offset (out_offset - (cur_offset))
+#define jmp_offset (tc_ninsn - (cur_offset))
/*
* a0: &ctx
@@ -247,6 +246,8 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx)
* if (index >= array->map.max_entries)
* goto out;
*/
+ tc_ninsn = insn ? ctx->offset[insn+1] - ctx->offset[insn] :
+ ctx->offset[0];
off = offsetof(struct bpf_array, map.max_entries);
emit_insn(ctx, ldwu, t1, a1, off);
/* bgeu $a2, $t1, jmp_offset */
@@ -278,15 +279,6 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx)
emit_insn(ctx, ldd, t3, t2, off);
__build_epilogue(ctx, true);
- /* out: */
- if (out_offset == -1)
- out_offset = cur_offset;
- if (cur_offset != out_offset) {
- pr_err_once("tail_call out_offset = %d, expected %d!\n",
- cur_offset, out_offset);
- return -1;
- }
-
return 0;
toofar:
@@ -931,7 +923,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
/* tail call */
case BPF_JMP | BPF_TAIL_CALL:
mark_tail_call(ctx);
- if (emit_bpf_tail_call(ctx) < 0)
+ if (emit_bpf_tail_call(ctx, i) < 0)
return -EINVAL;
break;
@@ -1365,7 +1357,6 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
if (tmp_blinded)
bpf_jit_prog_release_other(prog, prog == orig_prog ? tmp : orig_prog);
- out_offset = -1;
return prog;
--
2.43.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v5 2/2] LoongArch: BPF: Fix tailcall hierarchy
2025-07-31 7:50 [PATCH v5 0/2] Fix two tailcall-related issues Haoran Jiang
2025-07-31 7:50 ` [PATCH v5 1/2] LoongArch: BPF: Fix jump offset calculation in tailcall Haoran Jiang
@ 2025-07-31 7:50 ` Haoran Jiang
2025-08-03 14:25 ` [PATCH v5 0/2] Fix two tailcall-related issues Huacai Chen
2 siblings, 0 replies; 6+ messages in thread
From: Haoran Jiang @ 2025-07-31 7:50 UTC (permalink / raw)
To: loongarch
Cc: bpf, kernel, chenhuacai, hengqi.chen, yangtiezhu, jolsa, haoluo,
sdf, kpsingh, john.fastabend, yonghong.song, song, eddyz87,
martin.lau, andrii, daniel, ast, Geliang Tang
In specific use cases combining tailcalls and BPF-to-BPF calls，
MAX_TAIL_CALL_CNT won't work because of missing tail_call_cnt
back-propagation from callee to caller。This patch fixes this
tailcall issue caused by abusing the tailcall in bpf2bpf feature
on LoongArch like the way of "bpf, x64: Fix tailcall hierarchy".
push tail_call_cnt_ptr and tail_call_cnt into the stack,
tail_call_cnt_ptr is passed between tailcall and bpf2bpf,
uses tail_call_cnt_ptr to increment tail_call_cnt.
Fixes: bb035ef0cc91 ("LoongArch: BPF: Support mixing bpf2bpf and tailcalls")
Fixes: 5dc615520c4d ("LoongArch: Add BPF JIT support")
Reviewed-by: Geliang Tang <geliang@kernel.org>
Reviewed-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Haoran Jiang <jianghaoran@kylinos.cn>
---
arch/loongarch/net/bpf_jit.c | 150 ++++++++++++++++++++++++-----------
1 file changed, 104 insertions(+), 46 deletions(-)
diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.c
index 3f855d87eee3..e0274ae84651 100644
--- a/arch/loongarch/net/bpf_jit.c
+++ b/arch/loongarch/net/bpf_jit.c
@@ -17,10 +17,7 @@
#define LOONGARCH_BPF_FENTRY_NBYTES (LOONGARCH_LONG_JUMP_NINSNS * 4)
#define REG_TCC LOONGARCH_GPR_A6
-#define TCC_SAVED LOONGARCH_GPR_S5
-
-#define SAVE_RA BIT(0)
-#define SAVE_TCC BIT(1)
+#define BPF_TAIL_CALL_CNT_PTR_STACK_OFF(stack) (round_up(stack, 16) - 80)
static const int regmap[] = {
/* return value from in-kernel function, and exit value for eBPF program */
@@ -42,32 +39,55 @@ static const int regmap[] = {
[BPF_REG_AX] = LOONGARCH_GPR_T0,
};
-static void mark_call(struct jit_ctx *ctx)
+static void prepare_bpf_tail_call_cnt(struct jit_ctx *ctx, int *store_offset)
{
- ctx->flags |= SAVE_RA;
-}
+ const struct bpf_prog *prog = ctx->prog;
+ const bool is_main_prog = !bpf_is_subprog(prog);
-static void mark_tail_call(struct jit_ctx *ctx)
-{
- ctx->flags |= SAVE_TCC;
-}
+ if (is_main_prog) {
+ /*
+ * LOONGARCH_GPR_T3 = MAX_TAIL_CALL_CNT
+ * if (REG_TCC > T3 )
+ * std REG_TCC -> LOONGARCH_GPR_SP + store_offset
+ * else
+ * std REG_TCC -> LOONGARCH_GPR_SP + store_offset
+ * REG_TCC = LOONGARCH_GPR_SP + store_offset
+ *
+ * std REG_TCC -> LOONGARCH_GPR_SP + store_offset
+ *
+ * The purpose of this code is to first push the TCC into stack,
+ * and then push the address of TCC into stack.
+ * In cases where bpf2bpf and tailcall are used in combination,
+ * the value in REG_TCC may be a count or an address,
+ * these two cases need to be judged and handled separately.
+ */
+ emit_insn(ctx, addid, LOONGARCH_GPR_T3, LOONGARCH_GPR_ZERO, MAX_TAIL_CALL_CNT);
+ *store_offset -= sizeof(long);
-static bool seen_call(struct jit_ctx *ctx)
-{
- return (ctx->flags & SAVE_RA);
-}
+ emit_cond_jmp(ctx, BPF_JGT, REG_TCC, LOONGARCH_GPR_T3, 4);
-static bool seen_tail_call(struct jit_ctx *ctx)
-{
- return (ctx->flags & SAVE_TCC);
-}
+ /* If REG_TCC < MAX_TAIL_CALL_CNT, the value in REG_TCC is a count,
+ * push TCC into stack
+ */
+ emit_insn(ctx, std, REG_TCC, LOONGARCH_GPR_SP, *store_offset);
-static u8 tail_call_reg(struct jit_ctx *ctx)
-{
- if (seen_call(ctx))
- return TCC_SAVED;
+ /* Push the address of TCC into the REG_TCC */
+ emit_insn(ctx, addid, REG_TCC, LOONGARCH_GPR_SP, *store_offset);
+
+ emit_uncond_jmp(ctx, 2);
+
+ /* If REG_TCC > MAX_TAIL_CALL_CNT, the value in REG_TCC is an address,
+ * push TCC_ptr into stack
+ */
+ emit_insn(ctx, std, REG_TCC, LOONGARCH_GPR_SP, *store_offset);
+ } else {
+ *store_offset -= sizeof(long);
+ emit_insn(ctx, std, REG_TCC, LOONGARCH_GPR_SP, *store_offset);
+ }
- return REG_TCC;
+ /*push TCC_ptr into stack*/
+ *store_offset -= sizeof(long);
+ emit_insn(ctx, std, REG_TCC, LOONGARCH_GPR_SP, *store_offset);
}
/*
@@ -90,6 +110,10 @@ static u8 tail_call_reg(struct jit_ctx *ctx)
* | $s4 |
* +-------------------------+
* | $s5 |
+ * +-------------------------+
+ * | tcc |
+ * +-------------------------+
+ * | tcc_ptr |
* +-------------------------+ <--BPF_REG_FP
* | prog->aux->stack_depth |
* | (optional) |
@@ -100,12 +124,17 @@ static void build_prologue(struct jit_ctx *ctx)
{
int i;
int stack_adjust = 0, store_offset, bpf_stack_adjust;
+ const struct bpf_prog *prog = ctx->prog;
+ const bool is_main_prog = !bpf_is_subprog(prog);
bpf_stack_adjust = round_up(ctx->prog->aux->stack_depth, 16);
- /* To store ra, fp, s0, s1, s2, s3, s4 and s5. */
+ /* To store ra, fp, s0, s1, s2, s3, s4, s5 */
stack_adjust += sizeof(long) * 8;
+ /* To store tcc and tcc_ptr */
+ stack_adjust += sizeof(long) * 2;
+
stack_adjust = round_up(stack_adjust, 16);
stack_adjust += bpf_stack_adjust;
@@ -114,11 +143,12 @@ static void build_prologue(struct jit_ctx *ctx)
emit_insn(ctx, nop);
/*
- * First instruction initializes the tail call count (TCC).
- * On tail call we skip this instruction, and the TCC is
+ * First instruction initializes the tail call count (TCC) register
+ * to zero. On tail call we skip this instruction, and the TCC is
* passed in REG_TCC from the caller.
*/
- emit_insn(ctx, addid, REG_TCC, LOONGARCH_GPR_ZERO, MAX_TAIL_CALL_CNT);
+ if (is_main_prog)
+ emit_insn(ctx, addid, REG_TCC, LOONGARCH_GPR_ZERO, 0);
emit_insn(ctx, addid, LOONGARCH_GPR_SP, LOONGARCH_GPR_SP, -stack_adjust);
@@ -146,20 +176,13 @@ static void build_prologue(struct jit_ctx *ctx)
store_offset -= sizeof(long);
emit_insn(ctx, std, LOONGARCH_GPR_S5, LOONGARCH_GPR_SP, store_offset);
+ prepare_bpf_tail_call_cnt(ctx, &store_offset);
+
emit_insn(ctx, addid, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, stack_adjust);
if (bpf_stack_adjust)
emit_insn(ctx, addid, regmap[BPF_REG_FP], LOONGARCH_GPR_SP, bpf_stack_adjust);
- /*
- * Program contains calls and tail calls, so REG_TCC need
- * to be saved across calls.
- */
- if (seen_tail_call(ctx) && seen_call(ctx))
- move_reg(ctx, TCC_SAVED, REG_TCC);
- else
- emit_insn(ctx, nop);
-
ctx->stack_size = stack_adjust;
}
@@ -192,6 +215,16 @@ static void __build_epilogue(struct jit_ctx *ctx, bool is_tail_call)
load_offset -= sizeof(long);
emit_insn(ctx, ldd, LOONGARCH_GPR_S5, LOONGARCH_GPR_SP, load_offset);
+ /*
+ * When push into the stack, follow the order of tcc then tcc_ptr.
+ * When pop from the stack, first pop tcc_ptr followed by tcc
+ */
+ load_offset -= 2*sizeof(long);
+ emit_insn(ctx, ldd, REG_TCC, LOONGARCH_GPR_SP, load_offset);
+
+ load_offset += sizeof(long);
+ emit_insn(ctx, ldd, REG_TCC, LOONGARCH_GPR_SP, load_offset);
+
emit_insn(ctx, addid, LOONGARCH_GPR_SP, LOONGARCH_GPR_SP, stack_adjust);
if (!is_tail_call) {
@@ -204,7 +237,7 @@ static void __build_epilogue(struct jit_ctx *ctx, bool is_tail_call)
* Call the next bpf prog and skip the first instruction
* of TCC initialization.
*/
- emit_insn(ctx, jirl, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_T3, 1);
+ emit_insn(ctx, jirl, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_T3, 6);
}
}
@@ -226,7 +259,7 @@ bool bpf_jit_supports_far_kfunc_call(void)
static int emit_bpf_tail_call(struct jit_ctx *ctx, int insn)
{
int off;
- u8 tcc = tail_call_reg(ctx);
+ int tcc_ptr_off = BPF_TAIL_CALL_CNT_PTR_STACK_OFF(ctx->stack_size);
u8 a1 = LOONGARCH_GPR_A1;
u8 a2 = LOONGARCH_GPR_A2;
u8 t1 = LOONGARCH_GPR_T1;
@@ -255,11 +288,15 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx, int insn)
goto toofar;
/*
- * if (--TCC < 0)
- * goto out;
+ * if ((*tcc_ptr)++ >= MAX_TAIL_CALL_CNT)
+ * goto out;
*/
- emit_insn(ctx, addid, REG_TCC, tcc, -1);
- if (emit_tailcall_jmp(ctx, BPF_JSLT, REG_TCC, LOONGARCH_GPR_ZERO, jmp_offset) < 0)
+ emit_insn(ctx, ldd, REG_TCC, LOONGARCH_GPR_SP, tcc_ptr_off);
+ emit_insn(ctx, ldd, t3, REG_TCC, 0);
+ emit_insn(ctx, addid, t3, t3, 1);
+ emit_insn(ctx, std, t3, REG_TCC, 0);
+ emit_insn(ctx, addid, t2, LOONGARCH_GPR_ZERO, MAX_TAIL_CALL_CNT);
+ if (emit_tailcall_jmp(ctx, BPF_JSGT, t3, t2, jmp_offset) < 0)
goto toofar;
/*
@@ -480,6 +517,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
const s16 off = insn->off;
const s32 imm = insn->imm;
const bool is32 = BPF_CLASS(insn->code) == BPF_ALU || BPF_CLASS(insn->code) == BPF_JMP32;
+ int tcc_ptr_off;
switch (code) {
/* dst = src */
@@ -906,12 +944,16 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
/* function call */
case BPF_JMP | BPF_CALL:
- mark_call(ctx);
ret = bpf_jit_get_func_addr(ctx->prog, insn, extra_pass,
&func_addr, &func_addr_fixed);
if (ret < 0)
return ret;
+ if (insn->src_reg == BPF_PSEUDO_CALL) {
+ tcc_ptr_off = BPF_TAIL_CALL_CNT_PTR_STACK_OFF(ctx->stack_size);
+ emit_insn(ctx, ldd, REG_TCC, LOONGARCH_GPR_SP, tcc_ptr_off);
+ }
+
move_addr(ctx, t1, func_addr);
emit_insn(ctx, jirl, LOONGARCH_GPR_RA, t1, 0);
@@ -922,7 +964,6 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
/* tail call */
case BPF_JMP | BPF_TAIL_CALL:
- mark_tail_call(ctx);
if (emit_bpf_tail_call(ctx, i) < 0)
return -EINVAL;
break;
@@ -1597,7 +1638,7 @@ static int __arch_prepare_bpf_trampoline(struct jit_ctx *ctx, struct bpf_tramp_i
{
int i;
int stack_size = 0, nargs = 0;
- int retval_off, args_off, nargs_off, ip_off, run_ctx_off, sreg_off;
+ int retval_off, args_off, nargs_off, ip_off, run_ctx_off, sreg_off, tcc_ptr_off;
struct bpf_tramp_links *fentry = &tlinks[BPF_TRAMP_FENTRY];
struct bpf_tramp_links *fexit = &tlinks[BPF_TRAMP_FEXIT];
struct bpf_tramp_links *fmod_ret = &tlinks[BPF_TRAMP_MODIFY_RETURN];
@@ -1633,6 +1674,7 @@ static int __arch_prepare_bpf_trampoline(struct jit_ctx *ctx, struct bpf_tramp_i
*
* FP - sreg_off [ callee saved reg ]
*
+ * FP - tcc_ptr_off [ tail_call_cnt_ptr ]
*/
if (m->nr_args > LOONGARCH_MAX_REG_ARGS)
@@ -1675,6 +1717,12 @@ static int __arch_prepare_bpf_trampoline(struct jit_ctx *ctx, struct bpf_tramp_i
stack_size += 8;
sreg_off = stack_size;
+ /* room of trampoline frame to store tail_call_cnt_ptr */
+ if (flags & BPF_TRAMP_F_TAIL_CALL_CTX) {
+ stack_size += 8;
+ tcc_ptr_off = stack_size;
+ }
+
stack_size = round_up(stack_size, 16);
if (!is_struct_ops) {
@@ -1703,6 +1751,9 @@ static int __arch_prepare_bpf_trampoline(struct jit_ctx *ctx, struct bpf_tramp_i
emit_insn(ctx, addid, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, stack_size);
}
+ if (flags & BPF_TRAMP_F_TAIL_CALL_CTX)
+ emit_insn(ctx, std, REG_TCC, LOONGARCH_GPR_FP, -tcc_ptr_off);
+
/* callee saved register S1 to pass start time */
emit_insn(ctx, std, LOONGARCH_GPR_S1, LOONGARCH_GPR_FP, -sreg_off);
@@ -1750,6 +1801,10 @@ static int __arch_prepare_bpf_trampoline(struct jit_ctx *ctx, struct bpf_tramp_i
if (flags & BPF_TRAMP_F_CALL_ORIG) {
restore_args(ctx, m->nr_args, args_off);
+
+ if (flags & BPF_TRAMP_F_TAIL_CALL_CTX)
+ emit_insn(ctx, ldd, REG_TCC, LOONGARCH_GPR_FP, -tcc_ptr_off);
+
ret = emit_call(ctx, (const u64)orig_call);
if (ret)
goto out;
@@ -1791,6 +1846,9 @@ static int __arch_prepare_bpf_trampoline(struct jit_ctx *ctx, struct bpf_tramp_i
emit_insn(ctx, ldd, LOONGARCH_GPR_S1, LOONGARCH_GPR_FP, -sreg_off);
+ if (flags & BPF_TRAMP_F_TAIL_CALL_CTX)
+ emit_insn(ctx, ldd, REG_TCC, LOONGARCH_GPR_FP, -tcc_ptr_off);
+
if (!is_struct_ops) {
/* trampoline called from function entry */
emit_insn(ctx, ldd, LOONGARCH_GPR_T0, LOONGARCH_GPR_SP, stack_size - 8);
--
2.43.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v5 0/2] Fix two tailcall-related issues
2025-07-31 7:50 [PATCH v5 0/2] Fix two tailcall-related issues Haoran Jiang
2025-07-31 7:50 ` [PATCH v5 1/2] LoongArch: BPF: Fix jump offset calculation in tailcall Haoran Jiang
2025-07-31 7:50 ` [PATCH v5 2/2] LoongArch: BPF: Fix tailcall hierarchy Haoran Jiang
@ 2025-08-03 14:25 ` Huacai Chen
2025-08-04 1:35 ` 回复：[PATCH " jianghaoran
2 siblings, 1 reply; 6+ messages in thread
From: Huacai Chen @ 2025-08-03 14:25 UTC (permalink / raw)
To: Haoran Jiang
Cc: loongarch, bpf, kernel, hengqi.chen, yangtiezhu, jolsa, haoluo,
sdf, kpsingh, john.fastabend, yonghong.song, song, eddyz87,
martin.lau, andrii, daniel, ast
Hi, Haoran,
I think the first patch should be backported to stable branches and
the second depends on trampoline, right?
Huacai
On Thu, Jul 31, 2025 at 3:51 PM Haoran Jiang <jianghaoran@kylinos.cn> wrote:
>
> v5:
> 1,The format and comments have been modified.
>
> v4:
> 1,There is a conflict when merging these two patches on the basis of the trampoline series patches, resolve the conflict issue.
>
> v3:
> 1,In the prepare_bpf_tail_call_cnt function, emit_tailcall_jmp is replaced with emit_cond_jmp.
> 2,Fix the issue where test cases using fentry/fexit fail.
>
> Test after merging these two patches and the following trampoline series patches.
> https://lore.kernel.org/loongarch/CAK3+h2zirm6cV2tAbd38RSYSF3=B1qZ+9jm_GZPsAPrMtaozmg@mail.gmail.com/T/#mf1f1c9f965d5229c6d2dce3b1ca8bc9a5d70520d
>
> ./test_progs -a tailcalls
> #413/1 tailcalls/tailcall_1:OK
> #413/2 tailcalls/tailcall_2:OK
> #413/3 tailcalls/tailcall_3:OK
> #413/4 tailcalls/tailcall_4:OK
> #413/5 tailcalls/tailcall_5:OK
> #413/6 tailcalls/tailcall_6:OK
> #413/7 tailcalls/tailcall_bpf2bpf_1:OK
> #413/8 tailcalls/tailcall_bpf2bpf_2:OK
> #413/9 tailcalls/tailcall_bpf2bpf_3:OK
> #413/10 tailcalls/tailcall_bpf2bpf_4:OK
> #413/11 tailcalls/tailcall_bpf2bpf_5:OK
> #413/12 tailcalls/tailcall_bpf2bpf_6:OK
> #413/13 tailcalls/tailcall_bpf2bpf_fentry:OK
> #413/14 tailcalls/tailcall_bpf2bpf_fexit:OK
> #413/15 tailcalls/tailcall_bpf2bpf_fentry_fexit:OK
> #413/16 tailcalls/tailcall_bpf2bpf_fentry_entry:OK
> #413/17 tailcalls/tailcall_poke:OK
> #413/18 tailcalls/tailcall_bpf2bpf_hierarchy_1:OK
> #413/19 tailcalls/tailcall_bpf2bpf_hierarchy_fentry:OK
> #413/20 tailcalls/tailcall_bpf2bpf_hierarchy_fexit:OK
> #413/21 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_fexit:OK
> #413/22 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_entry:OK
> #413/23 tailcalls/tailcall_bpf2bpf_hierarchy_2:OK
> #413/24 tailcalls/tailcall_bpf2bpf_hierarchy_3:OK
> #413/25 tailcalls/tailcall_freplace:OK
> #413/26 tailcalls/tailcall_bpf2bpf_freplace:OK
> #413/27 tailcalls/tailcall_failure:OK
> #413/28 tailcalls/reject_tail_call_spin_lock:OK
> #413/29 tailcalls/reject_tail_call_rcu_lock:OK
> #413/30 tailcalls/reject_tail_call_preempt_lock:OK
> #413/31 tailcalls/reject_tail_call_ref:OK
> #413 tailcalls:OK
> Summary: 1/31 PASSED, 0 SKIPPED, 0 FAILED
>
>
> v2:
> 1,Add a Fixes tag.
> 2,Ctx as the first parameter of emit_bpf_tail_call.
> 3,Define jmp_offset as a macro in emit_bpf_tail_call.
>
> After merging these two patches, the test results are as follows:
>
> ./test_progs --allow=tailcalls
> tester_init:PASS:tester_log_buf 0 nsec
> process_subtest:PASS:obj_open_mem 0 nsec
> process_subtest:PASS:specs_alloc 0 nsec
> #413/1 tailcalls/tailcall_1:OK
> #413/2 tailcalls/tailcall_2:OK
> #413/3 tailcalls/tailcall_3:OK
> #413/4 tailcalls/tailcall_4:OK
> #413/5 tailcalls/tailcall_5:OK
> #413/6 tailcalls/tailcall_6:OK
> #413/7 tailcalls/tailcall_bpf2bpf_1:OK
> #413/8 tailcalls/tailcall_bpf2bpf_2:OK
> #413/9 tailcalls/tailcall_bpf2bpf_3:OK
> #413/10 tailcalls/tailcall_bpf2bpf_4:OK
> #413/11 tailcalls/tailcall_bpf2bpf_5:OK
> #413/12 tailcalls/tailcall_bpf2bpf_6:OK
> test_tailcall_count:PASS:open fentry_obj file 0 nsec
> test_tailcall_count:PASS:find fentry prog 0 nsec
> test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> test_tailcall_count:PASS:load fentry_obj 0 nsec
> libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> test_tailcall_count:FAIL:attach_trace unexpected error: -524
> #413/13 tailcalls/tailcall_bpf2bpf_fentry:FAIL
> test_tailcall_count:PASS:open fexit_obj file 0 nsec
> test_tailcall_count:PASS:find fexit prog 0 nsec
> test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> test_tailcall_count:PASS:load fexit_obj 0 nsec
> libbpf: prog 'fexit': failed to attach: -ENOTSUPP
> test_tailcall_count:FAIL:attach_trace unexpected error: -524
> #413/14 tailcalls/tailcall_bpf2bpf_fexit:FAIL
> test_tailcall_count:PASS:open fentry_obj file 0 nsec
> test_tailcall_count:PASS:find fentry prog 0 nsec
> test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> test_tailcall_count:PASS:load fentry_obj 0 nsec
> libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> test_tailcall_count:FAIL:attach_trace unexpected error: -524
> #413/15 tailcalls/tailcall_bpf2bpf_fentry_fexit:FAIL
> test_tailcall_bpf2bpf_fentry_entry:PASS:load tgt_obj 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:find jmp_table map 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:find jmp_table map fd 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:find classifier_0 prog 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:find classifier_0 prog fd 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:update jmp_table 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:open fentry_obj file 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:find fentry prog 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:set_attach_target classifier_0 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:load fentry_obj 0 nsec
> libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> test_tailcall_bpf2bpf_fentry_entry:FAIL:attach_trace unexpected error: -524
> #413/16 tailcalls/tailcall_bpf2bpf_fentry_entry:FAIL
> #413/17 tailcalls/tailcall_poke:OK
> #413/18 tailcalls/tailcall_bpf2bpf_hierarchy_1:OK
> test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> #413/19 tailcalls/tailcall_bpf2bpf_hierarchy_fentry:FAIL
> test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> test_tailcall_hierarchy_count:PASS:open fexit_obj file 0 nsec
> test_tailcall_hierarchy_count:PASS:find fexit prog 0 nsec
> test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> test_tailcall_hierarchy_count:PASS:load fexit_obj 0 nsec
> libbpf: prog 'fexit': failed to attach: -ENOTSUPP
> test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> #413/20 tailcalls/tailcall_bpf2bpf_hierarchy_fexit:FAIL
> test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> #413/21 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_fexit:FAIL
> test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> test_tailcall_hierarchy_count:PASS:set_attach_target entry 0 nsec
> test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> tester_init:PASS:tester_log_buf 0 nsec
> process_subtest:PASS:obj_open_mem 0 nsec
> process_subtest:PASS:specs_alloc 0 nsec
> #413/22 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_entry:FAIL
> #413/23 tailcalls/tailcall_bpf2bpf_hierarchy_2:OK
> #413/24 tailcalls/tailcall_bpf2bpf_hierarchy_3:OK
> test_tailcall_freplace:PASS:tailcall_freplace__open 0 nsec
> test_tailcall_freplace:PASS:tc_bpf2bpf__open_and_load 0 nsec
> test_tailcall_freplace:PASS:set_attach_target 0 nsec
> test_tailcall_freplace:PASS:tailcall_freplace__load 0 nsec
> test_tailcall_freplace:PASS:update jmp_table failure 0 nsec
> libbpf: prog 'entry_freplace': failed to attach to freplace: -ENOTSUPP
> test_tailcall_freplace:FAIL:attach_freplace unexpected error: -524
> #413/25 tailcalls/tailcall_freplace:FAIL
> test_tailcall_bpf2bpf_freplace:PASS:tc_bpf2bpf__open_and_load 0 nsec
> test_tailcall_bpf2bpf_freplace:PASS:tailcall_freplace__open 0 nsec
> test_tailcall_bpf2bpf_freplace:PASS:set_attach_target 0 nsec
> test_tailcall_bpf2bpf_freplace:PASS:tailcall_freplace__load 0 nsec
> libbpf: prog 'entry_freplace': failed to attach to freplace: -ENOTSUPP
> test_tailcall_bpf2bpf_freplace:FAIL:attach_freplace unexpected error: -524
> #413/26 tailcalls/tailcall_bpf2bpf_freplace:FAIL
> #413/27 tailcalls/tailcall_failure:OK
> #413/28 tailcalls/reject_tail_call_spin_lock:OK
> #413/29 tailcalls/reject_tail_call_rcu_lock:OK
> #413/30 tailcalls/reject_tail_call_preempt_lock:OK
> #413/31 tailcalls/reject_tail_call_ref:OK
> #413 tailcalls:FAIL
>
> All error logs:
> tester_init:PASS:tester_log_buf 0 nsec
> process_subtest:PASS:obj_open_mem 0 nsec
> process_subtest:PASS:specs_alloc 0 nsec
> test_tailcall_count:PASS:open fentry_obj file 0 nsec
> test_tailcall_count:PASS:find fentry prog 0 nsec
> test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> test_tailcall_count:PASS:load fentry_obj 0 nsec
> libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> test_tailcall_count:FAIL:attach_trace unexpected error: -524
> #413/13 tailcalls/tailcall_bpf2bpf_fentry:FAIL
> test_tailcall_count:PASS:open fexit_obj file 0 nsec
> test_tailcall_count:PASS:find fexit prog 0 nsec
> test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> test_tailcall_count:PASS:load fexit_obj 0 nsec
> libbpf: prog 'fexit': failed to attach: -ENOTSUPP
> test_tailcall_count:FAIL:attach_trace unexpected error: -524
> #413/14 tailcalls/tailcall_bpf2bpf_fexit:FAIL
> test_tailcall_count:PASS:open fentry_obj file 0 nsec
> test_tailcall_count:PASS:find fentry prog 0 nsec
> test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> test_tailcall_count:PASS:load fentry_obj 0 nsec
> libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> test_tailcall_count:FAIL:attach_trace unexpected error: -524
> #413/15 tailcalls/tailcall_bpf2bpf_fentry_fexit:FAIL
> test_tailcall_bpf2bpf_fentry_entry:PASS:load tgt_obj 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:find jmp_table map 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:find jmp_table map fd 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:find classifier_0 prog 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:find classifier_0 prog fd 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:update jmp_table 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:open fentry_obj file 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:find fentry prog 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:set_attach_target classifier_0 0 nsec
> test_tailcall_bpf2bpf_fentry_entry:PASS:load fentry_obj 0 nsec
> libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> test_tailcall_bpf2bpf_fentry_entry:FAIL:attach_trace unexpected error: -524
> #413/16 tailcalls/tailcall_bpf2bpf_fentry_entry:FAIL
> test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> #413/19 tailcalls/tailcall_bpf2bpf_hierarchy_fentry:FAIL
> test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> test_tailcall_hierarchy_count:PASS:open fexit_obj file 0 nsec
> test_tailcall_hierarchy_count:PASS:find fexit prog 0 nsec
> test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> test_tailcall_hierarchy_count:PASS:load fexit_obj 0 nsec
> libbpf: prog 'fexit': failed to attach: -ENOTSUPP
> test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> #413/20 tailcalls/tailcall_bpf2bpf_hierarchy_fexit:FAIL
> test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> #413/21 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_fexit:FAIL
> test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> test_tailcall_hierarchy_count:PASS:set_attach_target entry 0 nsec
> test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> tester_init:PASS:tester_log_buf 0 nsec
> process_subtest:PASS:obj_open_mem 0 nsec
> process_subtest:PASS:specs_alloc 0 nsec
> #413/22 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_entry:FAIL
> test_tailcall_freplace:PASS:tailcall_freplace__open 0 nsec
> test_tailcall_freplace:PASS:tc_bpf2bpf__open_and_load 0 nsec
> test_tailcall_freplace:PASS:set_attach_target 0 nsec
> test_tailcall_freplace:PASS:tailcall_freplace__load 0 nsec
> test_tailcall_freplace:PASS:update jmp_table failure 0 nsec
> libbpf: prog 'entry_freplace': failed to attach to freplace: -ENOTSUPP
> test_tailcall_freplace:FAIL:attach_freplace unexpected error: -524
> #413/25 tailcalls/tailcall_freplace:FAIL
> test_tailcall_bpf2bpf_freplace:PASS:tc_bpf2bpf__open_and_load 0 nsec
> test_tailcall_bpf2bpf_freplace:PASS:tailcall_freplace__open 0 nsec
> test_tailcall_bpf2bpf_freplace:PASS:set_attach_target 0 nsec
> test_tailcall_bpf2bpf_freplace:PASS:tailcall_freplace__load 0 nsec
> libbpf: prog 'entry_freplace': failed to attach to freplace: -ENOTSUPP
> test_tailcall_bpf2bpf_freplace:FAIL:attach_freplace unexpected error: -524
> #413/26 tailcalls/tailcall_bpf2bpf_freplace:FAIL
> #413 tailcalls:FAIL
> Summary: 0/21 PASSED, 0 SKIPPED, 1 FAILED
>
> v1:
> 1,Fix the jmp_offset calculation error in the emit_bpf_tail_call function.
> 2,Fix the issue that MAX_TAIL_CALL_CNT limit bypass in hybrid tailcall and BPF-to-BPF call
>
> After applying this patch, testing results are as follows:
>
> ./test_progs --allow=tailcalls/tailcall_bpf2bpf_hierarchy_1
> 413/18 tailcalls/tailcall_bpf2bpf_hierarchy_1:OK
> 413 tailcalls:OK
> Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED
>
> ./test_progs --allow=tailcalls/tailcall_bpf2bpf_hierarchy_2
> 413/23 tailcalls/tailcall_bpf2bpf_hierarchy_2:OK
> 413 tailcalls:OK
> Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED
>
> ./test_progs --allow=tailcalls/tailcall_bpf2bpf_hierarchy_3
> 413/24 tailcalls/tailcall_bpf2bpf_hierarchy_3:OK
> 413 tailcalls:OK
> Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED
>
> Haoran Jiang (2):
> LoongArch: BPF: Fix jump offset calculation in tailcall
> LoongArch: BPF: Fix tailcall hierarchy
>
> arch/loongarch/net/bpf_jit.c | 171 ++++++++++++++++++++++-------------
> 1 file changed, 110 insertions(+), 61 deletions(-)
>
> --
> 2.43.0
>
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* 回复：[PATCH v5 0/2] Fix two tailcall-related issues
2025-08-03 14:25 ` [PATCH v5 0/2] Fix two tailcall-related issues Huacai Chen
@ 2025-08-04 1:35 ` jianghaoran
2025-08-04 2:05 ` [PATCH " Huacai Chen
0 siblings, 1 reply; 6+ messages in thread
From: jianghaoran @ 2025-08-04 1:35 UTC (permalink / raw)
To: Huacai Chen
Cc: loongarch, bpf, kernel, hengqi.chen, yangtiezhu, jolsa, haoluo,
sdf, kpsingh, john.fastabend, yonghong.song, song, eddyz87,
martin.lau, andrii, daniel, ast
在 2025-08-03星期日的 22:25 +0800，Huacai Chen写道：
> Hi, Haoran,
>
> I think the first patch should be backported to stable branches
> and
> the second depends on trampoline, right?
>
> Huacai
>
That's the case.
>
> On Thu, Jul 31, 2025 at 3:51 PM Haoran Jiang <
jianghaoran@kylinos.cn> > wrote:
> >
> > v5:
> > 1,The format and comments have been modified.
> >
> > v4:
> > 1,There is a conflict when merging these two patches on the basis of the trampoline series patches, resolve the conflict issue.
> >
> > v3:
> > 1,In the prepare_bpf_tail_call_cnt function, emit_tailcall_jmp is replaced with emit_cond_jmp.
> > 2,Fix the issue where test cases using fentry/fexit fail.
> >
> > Test after merging these two patches and the following trampoline series patches.
https://lore.kernel.org/loongarch/CAK3+h2zirm6cV2tAbd38RSYSF3=B1qZ+9jm_GZPsAPrMtaozmg@mail.gmail.com/T/#mf1f1c9f965d5229c6d2dce3b1ca8bc9a5d70520d> >
> >
> > ./test_progs -a tailcalls
> > #413/1 tailcalls/tailcall_1:OK
> > #413/2 tailcalls/tailcall_2:OK
> > #413/3 tailcalls/tailcall_3:OK
> > #413/4 tailcalls/tailcall_4:OK
> > #413/5 tailcalls/tailcall_5:OK
> > #413/6 tailcalls/tailcall_6:OK
> > #413/7 tailcalls/tailcall_bpf2bpf_1:OK
> > #413/8 tailcalls/tailcall_bpf2bpf_2:OK
> > #413/9 tailcalls/tailcall_bpf2bpf_3:OK
> > #413/10 tailcalls/tailcall_bpf2bpf_4:OK
> > #413/11 tailcalls/tailcall_bpf2bpf_5:OK
> > #413/12 tailcalls/tailcall_bpf2bpf_6:OK
> > #413/13 tailcalls/tailcall_bpf2bpf_fentry:OK
> > #413/14 tailcalls/tailcall_bpf2bpf_fexit:OK
> > #413/15 tailcalls/tailcall_bpf2bpf_fentry_fexit:OK
> > #413/16 tailcalls/tailcall_bpf2bpf_fentry_entry:OK
> > #413/17 tailcalls/tailcall_poke:OK
> > #413/18 tailcalls/tailcall_bpf2bpf_hierarchy_1:OK
> > #413/19 tailcalls/tailcall_bpf2bpf_hierarchy_fentry:OK
> > #413/20 tailcalls/tailcall_bpf2bpf_hierarchy_fexit:OK
> > #413/21 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_fexit:OK
> > #413/22 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_entry:OK
> > #413/23 tailcalls/tailcall_bpf2bpf_hierarchy_2:OK
> > #413/24 tailcalls/tailcall_bpf2bpf_hierarchy_3:OK
> > #413/25 tailcalls/tailcall_freplace:OK
> > #413/26 tailcalls/tailcall_bpf2bpf_freplace:OK
> > #413/27 tailcalls/tailcall_failure:OK
> > #413/28 tailcalls/reject_tail_call_spin_lock:OK
> > #413/29 tailcalls/reject_tail_call_rcu_lock:OK
> > #413/30 tailcalls/reject_tail_call_preempt_lock:OK
> > #413/31 tailcalls/reject_tail_call_ref:OK
> > #413 tailcalls:OK
> > Summary: 1/31 PASSED, 0 SKIPPED, 0 FAILED
> >
> >
> > v2:
> > 1,Add a Fixes tag.
> > 2,Ctx as the first parameter of emit_bpf_tail_call.
> > 3,Define jmp_offset as a macro in emit_bpf_tail_call.
> >
> > After merging these two patches, the test results are as follows:
> >
> > ./test_progs --allow=tailcalls
> > tester_init:PASS:tester_log_buf 0 nsec
> > process_subtest:PASS:obj_open_mem 0 nsec
> > process_subtest:PASS:specs_alloc 0 nsec
> > #413/1 tailcalls/tailcall_1:OK
> > #413/2 tailcalls/tailcall_2:OK
> > #413/3 tailcalls/tailcall_3:OK
> > #413/4 tailcalls/tailcall_4:OK
> > #413/5 tailcalls/tailcall_5:OK
> > #413/6 tailcalls/tailcall_6:OK
> > #413/7 tailcalls/tailcall_bpf2bpf_1:OK
> > #413/8 tailcalls/tailcall_bpf2bpf_2:OK
> > #413/9 tailcalls/tailcall_bpf2bpf_3:OK
> > #413/10 tailcalls/tailcall_bpf2bpf_4:OK
> > #413/11 tailcalls/tailcall_bpf2bpf_5:OK
> > #413/12 tailcalls/tailcall_bpf2bpf_6:OK
> > test_tailcall_count:PASS:open fentry_obj file 0 nsec
> > test_tailcall_count:PASS:find fentry prog 0 nsec
> > test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> > test_tailcall_count:PASS:load fentry_obj 0 nsec
> > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > test_tailcall_count:FAIL:attach_trace unexpected error: -524
> > #413/13 tailcalls/tailcall_bpf2bpf_fentry:FAIL
> > test_tailcall_count:PASS:open fexit_obj file 0 nsec
> > test_tailcall_count:PASS:find fexit prog 0 nsec
> > test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> > test_tailcall_count:PASS:load fexit_obj 0 nsec
> > libbpf: prog 'fexit': failed to attach: -ENOTSUPP
> > test_tailcall_count:FAIL:attach_trace unexpected error: -524
> > #413/14 tailcalls/tailcall_bpf2bpf_fexit:FAIL
> > test_tailcall_count:PASS:open fentry_obj file 0 nsec
> > test_tailcall_count:PASS:find fentry prog 0 nsec
> > test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> > test_tailcall_count:PASS:load fentry_obj 0 nsec
> > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > test_tailcall_count:FAIL:attach_trace unexpected error: -524
> > #413/15 tailcalls/tailcall_bpf2bpf_fentry_fexit:FAIL
> > test_tailcall_bpf2bpf_fentry_entry:PASS:load tgt_obj 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:find jmp_table map 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:find jmp_table map fd 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:find classifier_0 prog 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:find classifier_0 prog fd 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:update jmp_table 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:open fentry_obj file 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:find fentry prog 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:set_attach_target classifier_0 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:load fentry_obj 0 nsec
> > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > test_tailcall_bpf2bpf_fentry_entry:FAIL:attach_trace unexpected error: -524
> > #413/16 tailcalls/tailcall_bpf2bpf_fentry_entry:FAIL
> > #413/17 tailcalls/tailcall_poke:OK
> > #413/18 tailcalls/tailcall_bpf2bpf_hierarchy_1:OK
> > test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> > test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> > test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> > test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> > test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> > test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> > test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> > test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> > test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> > test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> > test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> > #413/19 tailcalls/tailcall_bpf2bpf_hierarchy_fentry:FAIL
> > test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> > test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> > test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> > test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> > test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> > test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> > test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> > test_tailcall_hierarchy_count:PASS:open fexit_obj file 0 nsec
> > test_tailcall_hierarchy_count:PASS:find fexit prog 0 nsec
> > test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> > test_tailcall_hierarchy_count:PASS:load fexit_obj 0 nsec
> > libbpf: prog 'fexit': failed to attach: -ENOTSUPP
> > test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> > #413/20 tailcalls/tailcall_bpf2bpf_hierarchy_fexit:FAIL
> > test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> > test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> > test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> > test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> > test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> > test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> > test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> > test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> > test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> > test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> > test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> > #413/21 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_fexit:FAIL
> > test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> > test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> > test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> > test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> > test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> > test_tailcall_hierarchy_count:PASS:set_attach_target entry 0 nsec
> > test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> > tester_init:PASS:tester_log_buf 0 nsec
> > process_subtest:PASS:obj_open_mem 0 nsec
> > process_subtest:PASS:specs_alloc 0 nsec
> > #413/22 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_entry:FAIL
> > #413/23 tailcalls/tailcall_bpf2bpf_hierarchy_2:OK
> > #413/24 tailcalls/tailcall_bpf2bpf_hierarchy_3:OK
> > test_tailcall_freplace:PASS:tailcall_freplace__open 0 nsec
> > test_tailcall_freplace:PASS:tc_bpf2bpf__open_and_load 0 nsec
> > test_tailcall_freplace:PASS:set_attach_target 0 nsec
> > test_tailcall_freplace:PASS:tailcall_freplace__load 0 nsec
> > test_tailcall_freplace:PASS:update jmp_table failure 0 nsec
> > libbpf: prog 'entry_freplace': failed to attach to freplace: -ENOTSUPP
> > test_tailcall_freplace:FAIL:attach_freplace unexpected error: -524
> > #413/25 tailcalls/tailcall_freplace:FAIL
> > test_tailcall_bpf2bpf_freplace:PASS:tc_bpf2bpf__open_and_load 0 nsec
> > test_tailcall_bpf2bpf_freplace:PASS:tailcall_freplace__open 0 nsec
> > test_tailcall_bpf2bpf_freplace:PASS:set_attach_target 0 nsec
> > test_tailcall_bpf2bpf_freplace:PASS:tailcall_freplace__load 0 nsec
> > libbpf: prog 'entry_freplace': failed to attach to freplace: -ENOTSUPP
> > test_tailcall_bpf2bpf_freplace:FAIL:attach_freplace unexpected error: -524
> > #413/26 tailcalls/tailcall_bpf2bpf_freplace:FAIL
> > #413/27 tailcalls/tailcall_failure:OK
> > #413/28 tailcalls/reject_tail_call_spin_lock:OK
> > #413/29 tailcalls/reject_tail_call_rcu_lock:OK
> > #413/30 tailcalls/reject_tail_call_preempt_lock:OK
> > #413/31 tailcalls/reject_tail_call_ref:OK
> > #413 tailcalls:FAIL
> >
> > All error logs:
> > tester_init:PASS:tester_log_buf 0 nsec
> > process_subtest:PASS:obj_open_mem 0 nsec
> > process_subtest:PASS:specs_alloc 0 nsec
> > test_tailcall_count:PASS:open fentry_obj file 0 nsec
> > test_tailcall_count:PASS:find fentry prog 0 nsec
> > test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> > test_tailcall_count:PASS:load fentry_obj 0 nsec
> > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > test_tailcall_count:FAIL:attach_trace unexpected error: -524
> > #413/13 tailcalls/tailcall_bpf2bpf_fentry:FAIL
> > test_tailcall_count:PASS:open fexit_obj file 0 nsec
> > test_tailcall_count:PASS:find fexit prog 0 nsec
> > test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> > test_tailcall_count:PASS:load fexit_obj 0 nsec
> > libbpf: prog 'fexit': failed to attach: -ENOTSUPP
> > test_tailcall_count:FAIL:attach_trace unexpected error: -524
> > #413/14 tailcalls/tailcall_bpf2bpf_fexit:FAIL
> > test_tailcall_count:PASS:open fentry_obj file 0 nsec
> > test_tailcall_count:PASS:find fentry prog 0 nsec
> > test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> > test_tailcall_count:PASS:load fentry_obj 0 nsec
> > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > test_tailcall_count:FAIL:attach_trace unexpected error: -524
> > #413/15 tailcalls/tailcall_bpf2bpf_fentry_fexit:FAIL
> > test_tailcall_bpf2bpf_fentry_entry:PASS:load tgt_obj 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:find jmp_table map 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:find jmp_table map fd 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:find classifier_0 prog 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:find classifier_0 prog fd 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:update jmp_table 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:open fentry_obj file 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:find fentry prog 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:set_attach_target classifier_0 0 nsec
> > test_tailcall_bpf2bpf_fentry_entry:PASS:load fentry_obj 0 nsec
> > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > test_tailcall_bpf2bpf_fentry_entry:FAIL:attach_trace unexpected error: -524
> > #413/16 tailcalls/tailcall_bpf2bpf_fentry_entry:FAIL
> > test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> > test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> > test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> > test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> > test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> > test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> > test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> > test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> > test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> > test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> > test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> > #413/19 tailcalls/tailcall_bpf2bpf_hierarchy_fentry:FAIL
> > test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> > test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> > test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> > test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> > test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> > test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> > test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> > test_tailcall_hierarchy_count:PASS:open fexit_obj file 0 nsec
> > test_tailcall_hierarchy_count:PASS:find fexit prog 0 nsec
> > test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> > test_tailcall_hierarchy_count:PASS:load fexit_obj 0 nsec
> > libbpf: prog 'fexit': failed to attach: -ENOTSUPP
> > test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> > #413/20 tailcalls/tailcall_bpf2bpf_hierarchy_fexit:FAIL
> > test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> > test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> > test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> > test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> > test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> > test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> > test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> > test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> > test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> > test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> > test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> > #413/21 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_fexit:FAIL
> > test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> > test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> > test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> > test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> > test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> > test_tailcall_hierarchy_count:PASS:set_attach_target entry 0 nsec
> > test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> > tester_init:PASS:tester_log_buf 0 nsec
> > process_subtest:PASS:obj_open_mem 0 nsec
> > process_subtest:PASS:specs_alloc 0 nsec
> > #413/22 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_entry:FAIL
> > test_tailcall_freplace:PASS:tailcall_freplace__open 0 nsec
> > test_tailcall_freplace:PASS:tc_bpf2bpf__open_and_load 0 nsec
> > test_tailcall_freplace:PASS:set_attach_target 0 nsec
> > test_tailcall_freplace:PASS:tailcall_freplace__load 0 nsec
> > test_tailcall_freplace:PASS:update jmp_table failure 0 nsec
> > libbpf: prog 'entry_freplace': failed to attach to freplace: -ENOTSUPP
> > test_tailcall_freplace:FAIL:attach_freplace unexpected error: -524
> > #413/25 tailcalls/tailcall_freplace:FAIL
> > test_tailcall_bpf2bpf_freplace:PASS:tc_bpf2bpf__open_and_load 0 nsec
> > test_tailcall_bpf2bpf_freplace:PASS:tailcall_freplace__open 0 nsec
> > test_tailcall_bpf2bpf_freplace:PASS:set_attach_target 0 nsec
> > test_tailcall_bpf2bpf_freplace:PASS:tailcall_freplace__load 0 nsec
> > libbpf: prog 'entry_freplace': failed to attach to freplace: -ENOTSUPP
> > test_tailcall_bpf2bpf_freplace:FAIL:attach_freplace unexpected error: -524
> > #413/26 tailcalls/tailcall_bpf2bpf_freplace:FAIL
> > #413 tailcalls:FAIL
> > Summary: 0/21 PASSED, 0 SKIPPED, 1 FAILED
> >
> > v1:
> > 1,Fix the jmp_offset calculation error in the emit_bpf_tail_call function.
> > 2,Fix the issue that MAX_TAIL_CALL_CNT limit bypass in hybrid tailcall and BPF-to-BPF call
> >
> > After applying this patch, testing results are as follows:
> >
> > ./test_progs --allow=tailcalls/tailcall_bpf2bpf_hierarchy_1
> > 413/18 tailcalls/tailcall_bpf2bpf_hierarchy_1:OK
> > 413 tailcalls:OK
> > Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED
> >
> > ./test_progs --allow=tailcalls/tailcall_bpf2bpf_hierarchy_2
> > 413/23 tailcalls/tailcall_bpf2bpf_hierarchy_2:OK
> > 413 tailcalls:OK
> > Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED
> >
> > ./test_progs --allow=tailcalls/tailcall_bpf2bpf_hierarchy_3
> > 413/24 tailcalls/tailcall_bpf2bpf_hierarchy_3:OK
> > 413 tailcalls:OK
> > Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED
> >
> > Haoran Jiang (2):
> > LoongArch: BPF: Fix jump offset calculation in tailcall
> > LoongArch: BPF: Fix tailcall hierarchy
> >
> > arch/loongarch/net/bpf_jit.c | 171 ++++++++++++++++++++++-------------
> > 1 file changed, 110 insertions(+), 61 deletions(-)
> >
> > --
> > 2.43.0
> >
> >
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v5 0/2] Fix two tailcall-related issues
2025-08-04 1:35 ` 回复：[PATCH " jianghaoran
@ 2025-08-04 2:05 ` Huacai Chen
0 siblings, 0 replies; 6+ messages in thread
From: Huacai Chen @ 2025-08-04 2:05 UTC (permalink / raw)
To: jianghaoran
Cc: loongarch, bpf, kernel, hengqi.chen, yangtiezhu, jolsa, haoluo,
sdf, kpsingh, john.fastabend, yonghong.song, song, eddyz87,
martin.lau, andrii, daniel, ast
On Mon, Aug 4, 2025 at 9:35 AM jianghaoran <jianghaoran@kylinos.cn> wrote:
>
>
>
>
>
> 在 2025-08-03星期日的 22:25 +0800，Huacai Chen写道：
> > Hi, Haoran,
> >
> > I think the first patch should be backported to stable branches
> > and
> > the second depends on trampoline, right?
> >
> > Huacai
> >
>
> That's the case.
OK, applied.
Huacai
> >
> > On Thu, Jul 31, 2025 at 3:51 PM Haoran Jiang <
> jianghaoran@kylinos.cn> > wrote:
> > >
> > > v5:
> > > 1,The format and comments have been modified.
> > >
> > > v4:
> > > 1,There is a conflict when merging these two patches on the basis of the trampoline series patches, resolve the conflict issue.
> > >
> > > v3:
> > > 1,In the prepare_bpf_tail_call_cnt function, emit_tailcall_jmp is replaced with emit_cond_jmp.
> > > 2,Fix the issue where test cases using fentry/fexit fail.
> > >
> > > Test after merging these two patches and the following trampoline series patches.
> https://lore.kernel.org/loongarch/CAK3+h2zirm6cV2tAbd38RSYSF3=B1qZ+9jm_GZPsAPrMtaozmg@mail.gmail.com/T/#mf1f1c9f965d5229c6d2dce3b1ca8bc9a5d70520d> >
> > >
> > > ./test_progs -a tailcalls
> > > #413/1 tailcalls/tailcall_1:OK
> > > #413/2 tailcalls/tailcall_2:OK
> > > #413/3 tailcalls/tailcall_3:OK
> > > #413/4 tailcalls/tailcall_4:OK
> > > #413/5 tailcalls/tailcall_5:OK
> > > #413/6 tailcalls/tailcall_6:OK
> > > #413/7 tailcalls/tailcall_bpf2bpf_1:OK
> > > #413/8 tailcalls/tailcall_bpf2bpf_2:OK
> > > #413/9 tailcalls/tailcall_bpf2bpf_3:OK
> > > #413/10 tailcalls/tailcall_bpf2bpf_4:OK
> > > #413/11 tailcalls/tailcall_bpf2bpf_5:OK
> > > #413/12 tailcalls/tailcall_bpf2bpf_6:OK
> > > #413/13 tailcalls/tailcall_bpf2bpf_fentry:OK
> > > #413/14 tailcalls/tailcall_bpf2bpf_fexit:OK
> > > #413/15 tailcalls/tailcall_bpf2bpf_fentry_fexit:OK
> > > #413/16 tailcalls/tailcall_bpf2bpf_fentry_entry:OK
> > > #413/17 tailcalls/tailcall_poke:OK
> > > #413/18 tailcalls/tailcall_bpf2bpf_hierarchy_1:OK
> > > #413/19 tailcalls/tailcall_bpf2bpf_hierarchy_fentry:OK
> > > #413/20 tailcalls/tailcall_bpf2bpf_hierarchy_fexit:OK
> > > #413/21 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_fexit:OK
> > > #413/22 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_entry:OK
> > > #413/23 tailcalls/tailcall_bpf2bpf_hierarchy_2:OK
> > > #413/24 tailcalls/tailcall_bpf2bpf_hierarchy_3:OK
> > > #413/25 tailcalls/tailcall_freplace:OK
> > > #413/26 tailcalls/tailcall_bpf2bpf_freplace:OK
> > > #413/27 tailcalls/tailcall_failure:OK
> > > #413/28 tailcalls/reject_tail_call_spin_lock:OK
> > > #413/29 tailcalls/reject_tail_call_rcu_lock:OK
> > > #413/30 tailcalls/reject_tail_call_preempt_lock:OK
> > > #413/31 tailcalls/reject_tail_call_ref:OK
> > > #413 tailcalls:OK
> > > Summary: 1/31 PASSED, 0 SKIPPED, 0 FAILED
> > >
> > >
> > > v2:
> > > 1,Add a Fixes tag.
> > > 2,Ctx as the first parameter of emit_bpf_tail_call.
> > > 3,Define jmp_offset as a macro in emit_bpf_tail_call.
> > >
> > > After merging these two patches, the test results are as follows:
> > >
> > > ./test_progs --allow=tailcalls
> > > tester_init:PASS:tester_log_buf 0 nsec
> > > process_subtest:PASS:obj_open_mem 0 nsec
> > > process_subtest:PASS:specs_alloc 0 nsec
> > > #413/1 tailcalls/tailcall_1:OK
> > > #413/2 tailcalls/tailcall_2:OK
> > > #413/3 tailcalls/tailcall_3:OK
> > > #413/4 tailcalls/tailcall_4:OK
> > > #413/5 tailcalls/tailcall_5:OK
> > > #413/6 tailcalls/tailcall_6:OK
> > > #413/7 tailcalls/tailcall_bpf2bpf_1:OK
> > > #413/8 tailcalls/tailcall_bpf2bpf_2:OK
> > > #413/9 tailcalls/tailcall_bpf2bpf_3:OK
> > > #413/10 tailcalls/tailcall_bpf2bpf_4:OK
> > > #413/11 tailcalls/tailcall_bpf2bpf_5:OK
> > > #413/12 tailcalls/tailcall_bpf2bpf_6:OK
> > > test_tailcall_count:PASS:open fentry_obj file 0 nsec
> > > test_tailcall_count:PASS:find fentry prog 0 nsec
> > > test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> > > test_tailcall_count:PASS:load fentry_obj 0 nsec
> > > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > > test_tailcall_count:FAIL:attach_trace unexpected error: -524
> > > #413/13 tailcalls/tailcall_bpf2bpf_fentry:FAIL
> > > test_tailcall_count:PASS:open fexit_obj file 0 nsec
> > > test_tailcall_count:PASS:find fexit prog 0 nsec
> > > test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> > > test_tailcall_count:PASS:load fexit_obj 0 nsec
> > > libbpf: prog 'fexit': failed to attach: -ENOTSUPP
> > > test_tailcall_count:FAIL:attach_trace unexpected error: -524
> > > #413/14 tailcalls/tailcall_bpf2bpf_fexit:FAIL
> > > test_tailcall_count:PASS:open fentry_obj file 0 nsec
> > > test_tailcall_count:PASS:find fentry prog 0 nsec
> > > test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> > > test_tailcall_count:PASS:load fentry_obj 0 nsec
> > > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > > test_tailcall_count:FAIL:attach_trace unexpected error: -524
> > > #413/15 tailcalls/tailcall_bpf2bpf_fentry_fexit:FAIL
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:load tgt_obj 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:find jmp_table map 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:find jmp_table map fd 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:find classifier_0 prog 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:find classifier_0 prog fd 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:update jmp_table 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:open fentry_obj file 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:find fentry prog 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:set_attach_target classifier_0 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:load fentry_obj 0 nsec
> > > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > > test_tailcall_bpf2bpf_fentry_entry:FAIL:attach_trace unexpected error: -524
> > > #413/16 tailcalls/tailcall_bpf2bpf_fentry_entry:FAIL
> > > #413/17 tailcalls/tailcall_poke:OK
> > > #413/18 tailcalls/tailcall_bpf2bpf_hierarchy_1:OK
> > > test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> > > test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> > > test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> > > test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> > > test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> > > test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> > > test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> > > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > > test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> > > #413/19 tailcalls/tailcall_bpf2bpf_hierarchy_fentry:FAIL
> > > test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> > > test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> > > test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> > > test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> > > test_tailcall_hierarchy_count:PASS:open fexit_obj file 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find fexit prog 0 nsec
> > > test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> > > test_tailcall_hierarchy_count:PASS:load fexit_obj 0 nsec
> > > libbpf: prog 'fexit': failed to attach: -ENOTSUPP
> > > test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> > > #413/20 tailcalls/tailcall_bpf2bpf_hierarchy_fexit:FAIL
> > > test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> > > test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> > > test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> > > test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> > > test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> > > test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> > > test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> > > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > > test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> > > #413/21 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_fexit:FAIL
> > > test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> > > test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> > > test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> > > test_tailcall_hierarchy_count:PASS:set_attach_target entry 0 nsec
> > > test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> > > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > > test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> > > tester_init:PASS:tester_log_buf 0 nsec
> > > process_subtest:PASS:obj_open_mem 0 nsec
> > > process_subtest:PASS:specs_alloc 0 nsec
> > > #413/22 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_entry:FAIL
> > > #413/23 tailcalls/tailcall_bpf2bpf_hierarchy_2:OK
> > > #413/24 tailcalls/tailcall_bpf2bpf_hierarchy_3:OK
> > > test_tailcall_freplace:PASS:tailcall_freplace__open 0 nsec
> > > test_tailcall_freplace:PASS:tc_bpf2bpf__open_and_load 0 nsec
> > > test_tailcall_freplace:PASS:set_attach_target 0 nsec
> > > test_tailcall_freplace:PASS:tailcall_freplace__load 0 nsec
> > > test_tailcall_freplace:PASS:update jmp_table failure 0 nsec
> > > libbpf: prog 'entry_freplace': failed to attach to freplace: -ENOTSUPP
> > > test_tailcall_freplace:FAIL:attach_freplace unexpected error: -524
> > > #413/25 tailcalls/tailcall_freplace:FAIL
> > > test_tailcall_bpf2bpf_freplace:PASS:tc_bpf2bpf__open_and_load 0 nsec
> > > test_tailcall_bpf2bpf_freplace:PASS:tailcall_freplace__open 0 nsec
> > > test_tailcall_bpf2bpf_freplace:PASS:set_attach_target 0 nsec
> > > test_tailcall_bpf2bpf_freplace:PASS:tailcall_freplace__load 0 nsec
> > > libbpf: prog 'entry_freplace': failed to attach to freplace: -ENOTSUPP
> > > test_tailcall_bpf2bpf_freplace:FAIL:attach_freplace unexpected error: -524
> > > #413/26 tailcalls/tailcall_bpf2bpf_freplace:FAIL
> > > #413/27 tailcalls/tailcall_failure:OK
> > > #413/28 tailcalls/reject_tail_call_spin_lock:OK
> > > #413/29 tailcalls/reject_tail_call_rcu_lock:OK
> > > #413/30 tailcalls/reject_tail_call_preempt_lock:OK
> > > #413/31 tailcalls/reject_tail_call_ref:OK
> > > #413 tailcalls:FAIL
> > >
> > > All error logs:
> > > tester_init:PASS:tester_log_buf 0 nsec
> > > process_subtest:PASS:obj_open_mem 0 nsec
> > > process_subtest:PASS:specs_alloc 0 nsec
> > > test_tailcall_count:PASS:open fentry_obj file 0 nsec
> > > test_tailcall_count:PASS:find fentry prog 0 nsec
> > > test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> > > test_tailcall_count:PASS:load fentry_obj 0 nsec
> > > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > > test_tailcall_count:FAIL:attach_trace unexpected error: -524
> > > #413/13 tailcalls/tailcall_bpf2bpf_fentry:FAIL
> > > test_tailcall_count:PASS:open fexit_obj file 0 nsec
> > > test_tailcall_count:PASS:find fexit prog 0 nsec
> > > test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> > > test_tailcall_count:PASS:load fexit_obj 0 nsec
> > > libbpf: prog 'fexit': failed to attach: -ENOTSUPP
> > > test_tailcall_count:FAIL:attach_trace unexpected error: -524
> > > #413/14 tailcalls/tailcall_bpf2bpf_fexit:FAIL
> > > test_tailcall_count:PASS:open fentry_obj file 0 nsec
> > > test_tailcall_count:PASS:find fentry prog 0 nsec
> > > test_tailcall_count:PASS:set_attach_target subprog_tail 0 nsec
> > > test_tailcall_count:PASS:load fentry_obj 0 nsec
> > > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > > test_tailcall_count:FAIL:attach_trace unexpected error: -524
> > > #413/15 tailcalls/tailcall_bpf2bpf_fentry_fexit:FAIL
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:load tgt_obj 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:find jmp_table map 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:find jmp_table map fd 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:find classifier_0 prog 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:find classifier_0 prog fd 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:update jmp_table 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:open fentry_obj file 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:find fentry prog 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:set_attach_target classifier_0 0 nsec
> > > test_tailcall_bpf2bpf_fentry_entry:PASS:load fentry_obj 0 nsec
> > > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > > test_tailcall_bpf2bpf_fentry_entry:FAIL:attach_trace unexpected error: -524
> > > #413/16 tailcalls/tailcall_bpf2bpf_fentry_entry:FAIL
> > > test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> > > test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> > > test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> > > test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> > > test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> > > test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> > > test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> > > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > > test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> > > #413/19 tailcalls/tailcall_bpf2bpf_hierarchy_fentry:FAIL
> > > test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> > > test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> > > test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> > > test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> > > test_tailcall_hierarchy_count:PASS:open fexit_obj file 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find fexit prog 0 nsec
> > > test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> > > test_tailcall_hierarchy_count:PASS:load fexit_obj 0 nsec
> > > libbpf: prog 'fexit': failed to attach: -ENOTSUPP
> > > test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> > > #413/20 tailcalls/tailcall_bpf2bpf_hierarchy_fexit:FAIL
> > > test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> > > test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find jmp_table 0 nsec
> > > test_tailcall_hierarchy_count:PASS:map_fd 0 nsec
> > > test_tailcall_hierarchy_count:PASS:update jmp_table 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find data_map 0 nsec
> > > test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> > > test_tailcall_hierarchy_count:PASS:set_attach_target subprog_tail 0 nsec
> > > test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> > > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > > test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> > > #413/21 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_fexit:FAIL
> > > test_tailcall_hierarchy_count:PASS:load obj 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find entry prog 0 nsec
> > > test_tailcall_hierarchy_count:PASS:prog_fd 0 nsec
> > > test_tailcall_hierarchy_count:PASS:open fentry_obj file 0 nsec
> > > test_tailcall_hierarchy_count:PASS:find fentry prog 0 nsec
> > > test_tailcall_hierarchy_count:PASS:set_attach_target entry 0 nsec
> > > test_tailcall_hierarchy_count:PASS:load fentry_obj 0 nsec
> > > libbpf: prog 'fentry': failed to attach: -ENOTSUPP
> > > test_tailcall_hierarchy_count:FAIL:attach_trace unexpected error: -524
> > > tester_init:PASS:tester_log_buf 0 nsec
> > > process_subtest:PASS:obj_open_mem 0 nsec
> > > process_subtest:PASS:specs_alloc 0 nsec
> > > #413/22 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_entry:FAIL
> > > test_tailcall_freplace:PASS:tailcall_freplace__open 0 nsec
> > > test_tailcall_freplace:PASS:tc_bpf2bpf__open_and_load 0 nsec
> > > test_tailcall_freplace:PASS:set_attach_target 0 nsec
> > > test_tailcall_freplace:PASS:tailcall_freplace__load 0 nsec
> > > test_tailcall_freplace:PASS:update jmp_table failure 0 nsec
> > > libbpf: prog 'entry_freplace': failed to attach to freplace: -ENOTSUPP
> > > test_tailcall_freplace:FAIL:attach_freplace unexpected error: -524
> > > #413/25 tailcalls/tailcall_freplace:FAIL
> > > test_tailcall_bpf2bpf_freplace:PASS:tc_bpf2bpf__open_and_load 0 nsec
> > > test_tailcall_bpf2bpf_freplace:PASS:tailcall_freplace__open 0 nsec
> > > test_tailcall_bpf2bpf_freplace:PASS:set_attach_target 0 nsec
> > > test_tailcall_bpf2bpf_freplace:PASS:tailcall_freplace__load 0 nsec
> > > libbpf: prog 'entry_freplace': failed to attach to freplace: -ENOTSUPP
> > > test_tailcall_bpf2bpf_freplace:FAIL:attach_freplace unexpected error: -524
> > > #413/26 tailcalls/tailcall_bpf2bpf_freplace:FAIL
> > > #413 tailcalls:FAIL
> > > Summary: 0/21 PASSED, 0 SKIPPED, 1 FAILED
> > >
> > > v1:
> > > 1,Fix the jmp_offset calculation error in the emit_bpf_tail_call function.
> > > 2,Fix the issue that MAX_TAIL_CALL_CNT limit bypass in hybrid tailcall and BPF-to-BPF call
> > >
> > > After applying this patch, testing results are as follows:
> > >
> > > ./test_progs --allow=tailcalls/tailcall_bpf2bpf_hierarchy_1
> > > 413/18 tailcalls/tailcall_bpf2bpf_hierarchy_1:OK
> > > 413 tailcalls:OK
> > > Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED
> > >
> > > ./test_progs --allow=tailcalls/tailcall_bpf2bpf_hierarchy_2
> > > 413/23 tailcalls/tailcall_bpf2bpf_hierarchy_2:OK
> > > 413 tailcalls:OK
> > > Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED
> > >
> > > ./test_progs --allow=tailcalls/tailcall_bpf2bpf_hierarchy_3
> > > 413/24 tailcalls/tailcall_bpf2bpf_hierarchy_3:OK
> > > 413 tailcalls:OK
> > > Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED
> > >
> > > Haoran Jiang (2):
> > > LoongArch: BPF: Fix jump offset calculation in tailcall
> > > LoongArch: BPF: Fix tailcall hierarchy
> > >
> > > arch/loongarch/net/bpf_jit.c | 171 ++++++++++++++++++++++-------------
> > > 1 file changed, 110 insertions(+), 61 deletions(-)
> > >
> > > --
> > > 2.43.0
> > >
> > >
>
>
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2025-08-04 2:05 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-07-31 7:50 [PATCH v5 0/2] Fix two tailcall-related issues Haoran Jiang
2025-07-31 7:50 ` [PATCH v5 1/2] LoongArch: BPF: Fix jump offset calculation in tailcall Haoran Jiang
2025-07-31 7:50 ` [PATCH v5 2/2] LoongArch: BPF: Fix tailcall hierarchy Haoran Jiang
2025-08-03 14:25 ` [PATCH v5 0/2] Fix two tailcall-related issues Huacai Chen
2025-08-04 1:35 ` 回复：[PATCH " jianghaoran
2025-08-04 2:05 ` [PATCH " Huacai Chen
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