From: Chen Hui judy.chenhui@huawei.com
hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I7X7WW
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This helper function read the tag of the struct task. The bpf prog obtains the tags to detect different workloads.
Signed-off-by: Chen Hui judy.chenhui@huawei.com Signed-off-by: Ren Zhijie renzhijie2@huawei.com Signed-off-by: Hui Tang tanghui20@huawei.com Signed-off-by: Guan Jing guanjing6@huawei.com --- include/uapi/linux/bpf.h | 8 ++++++++ kernel/bpf/helpers.c | 3 +++ kernel/sched/bpf_sched.c | 17 +++++++++++++++++ tools/include/uapi/linux/bpf.h | 8 ++++++++ 4 files changed, 36 insertions(+)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 662bb9a46c8f..aa071e9bde72 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -5582,6 +5582,13 @@ union bpf_attr { * Return * Task group tag, if CONFIG_CGROUP_SCHED enabled, 0 as default tag, or * a negative error in case of failure. + * + * long bpf_sched_task_tag_of(struct task_struct *tsk) + * Description + * Return task tag of *tsk*.The bpf prog obtains the tags to detect + * different workloads. + * Return + * Task tag, if used, 0 as default tag, or a negative error in case of failure. */ #define ___BPF_FUNC_MAPPER(FN, ctx...) \ FN(unspec, 0, ##ctx) \ @@ -5799,6 +5806,7 @@ union bpf_attr { FN(get_sockops_uid_gid, 212, ##ctx) \ FN(sk_original_addr, 213, ##ctx) \ FN(sched_tg_tag_of, 214, ##ctx) \ + FN(sched_task_tag_of, 215, ##ctx) \ /* */
/* backwards-compatibility macros for users of __BPF_FUNC_MAPPER that don't diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c index d50b82093b57..3424eba97132 100644 --- a/kernel/bpf/helpers.c +++ b/kernel/bpf/helpers.c @@ -1655,6 +1655,7 @@ const struct bpf_func_proto bpf_probe_read_kernel_proto __weak; const struct bpf_func_proto bpf_probe_read_kernel_str_proto __weak; const struct bpf_func_proto bpf_task_pt_regs_proto __weak; const struct bpf_func_proto bpf_sched_tg_tag_of_proto __weak; +const struct bpf_func_proto bpf_sched_task_tag_of_proto __weak;
const struct bpf_func_proto * bpf_base_func_proto(enum bpf_func_id func_id) @@ -1706,6 +1707,8 @@ bpf_base_func_proto(enum bpf_func_id func_id) return &bpf_strtoul_proto; case BPF_FUNC_sched_tg_tag_of: return &bpf_sched_tg_tag_of_proto; + case BPF_FUNC_sched_task_tag_of: + return &bpf_sched_task_tag_of_proto; default: break; } diff --git a/kernel/sched/bpf_sched.c b/kernel/sched/bpf_sched.c index 975c4f984856..ad42e521cee3 100644 --- a/kernel/sched/bpf_sched.c +++ b/kernel/sched/bpf_sched.c @@ -85,3 +85,20 @@ const struct bpf_func_proto bpf_sched_tg_tag_of_proto = { .arg1_type = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID, .arg1_btf_id = &btf_sched_tg_ids[0], }; + +BPF_CALL_1(bpf_sched_task_tag_of, struct task_struct *, tsk) +{ + if (tsk == NULL) + return -EINVAL; + return tsk->tag; +} + +BTF_ID_LIST_SINGLE(btf_sched_task_ids, struct, task_struct) + +const struct bpf_func_proto bpf_sched_task_tag_of_proto = { + .func = bpf_sched_task_tag_of, + .gpl_only = false, + .ret_type = RET_INTEGER, + .arg1_type = PTR_MAYBE_NULL | ARG_PTR_TO_BTF_ID, + .arg1_btf_id = &btf_sched_task_ids[0], +}; diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 662bb9a46c8f..aa071e9bde72 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -5582,6 +5582,13 @@ union bpf_attr { * Return * Task group tag, if CONFIG_CGROUP_SCHED enabled, 0 as default tag, or * a negative error in case of failure. + * + * long bpf_sched_task_tag_of(struct task_struct *tsk) + * Description + * Return task tag of *tsk*.The bpf prog obtains the tags to detect + * different workloads. + * Return + * Task tag, if used, 0 as default tag, or a negative error in case of failure. */ #define ___BPF_FUNC_MAPPER(FN, ctx...) \ FN(unspec, 0, ##ctx) \ @@ -5799,6 +5806,7 @@ union bpf_attr { FN(get_sockops_uid_gid, 212, ##ctx) \ FN(sk_original_addr, 213, ##ctx) \ FN(sched_tg_tag_of, 214, ##ctx) \ + FN(sched_task_tag_of, 215, ##ctx) \ /* */
/* backwards-compatibility macros for users of __BPF_FUNC_MAPPER that don't