netdev - Re: [PATCH bpf-next v11 10/13] bpf, net: switch to dynamic registration

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Date: Wed, 22 Nov 2023 15:53:29 -0800
From: Kui-Feng Lee <sinquersw@...il.com>
To: Martin KaFai Lau <martin.lau@...ux.dev>, thinker.li@...il.com
Cc: kuifeng@...a.com, netdev@...r.kernel.org, bpf@...r.kernel.org,
 ast@...nel.org, song@...nel.org, kernel-team@...a.com, andrii@...nel.org,
 drosen@...gle.com
Subject: Re: [PATCH bpf-next v11 10/13] bpf, net: switch to dynamic
 registration



On 11/9/23 18:19, Martin KaFai Lau wrote:
> On 11/6/23 12:12 PM, thinker.li@...il.com wrote:
>> diff --git a/include/linux/bpf.h b/include/linux/bpf.h
>> index 48e97a255945..432c088d4001 100644
>> --- a/include/linux/bpf.h
>> +++ b/include/linux/bpf.h
>> @@ -1643,7 +1643,6 @@ struct bpf_struct_ops_desc {
>>   #if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
>>   #define BPF_MODULE_OWNER ((void *)((0xeB9FUL << 2) + 
>> POISON_POINTER_DELTA))
>>   const struct bpf_struct_ops_desc *bpf_struct_ops_find(struct btf 
>> *btf, u32 type_id);
>> -void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log);
>>   bool bpf_struct_ops_get(const void *kdata);
>>   void bpf_struct_ops_put(const void *kdata);
>>   int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
>> @@ -1689,10 +1688,6 @@ static inline const struct bpf_struct_ops_desc 
>> *bpf_struct_ops_find(struct btf *
>>   {
>>       return NULL;
>>   }
>> -static inline void bpf_struct_ops_init(struct btf *btf,
>> -                       struct bpf_verifier_log *log)
>> -{
>> -}
>>   static inline bool bpf_try_module_get(const void *data, struct 
>> module *owner)
>>   {
>>       return try_module_get(owner);
>> @@ -3232,6 +3227,8 @@ static inline bool bpf_is_subprog(const struct 
>> bpf_prog *prog)
>>   }
>>   #ifdef CONFIG_BPF_JIT
>> +int register_bpf_struct_ops(struct bpf_struct_ops *st_ops);
>> +
>>   enum bpf_struct_ops_state {
>>       BPF_STRUCT_OPS_STATE_INIT,
>>       BPF_STRUCT_OPS_STATE_INUSE,
>> @@ -3243,6 +3240,23 @@ struct bpf_struct_ops_common_value {
>>       refcount_t refcnt;
>>       enum bpf_struct_ops_state state;
>>   };
>> +
>> +/* bpf_struct_ops_##_name (e.g. bpf_struct_ops_tcp_congestion_ops) is
>> + * the map's value exposed to the userspace and its btf-type-id is
>> + * stored at the map->btf_vmlinux_value_type_id.
>> + *
>> + */
>> +#define DEFINE_STRUCT_OPS_VALUE_TYPE(_name)            \
>> +extern struct bpf_struct_ops bpf_##_name;            \
> 
> Is it still needed?

No, will remove it.

> 
>> +                                \
>> +struct bpf_struct_ops_##_name {                    \
>> +    struct bpf_struct_ops_common_value common;        \
>> +    struct _name data ____cacheline_aligned_in_smp;        \
>> +}
>> +
>> +extern int bpf_struct_ops_desc_init(struct bpf_struct_ops_desc 
>> *st_ops_desc,
>> +                    struct btf *btf,
>> +                    struct bpf_verifier_log *log);
> 
> nit. Remove extern.

Sure!

> 
>>   #endif /* CONFIG_BPF_JIT */
>>   #endif /* _LINUX_BPF_H */
>