Re: [PATCH bpf-next v3 1/2] bpf: add skcipher API support to TC/XDP programs

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On 01/11/2023 23:41, Martin KaFai Lau wrote:
On 11/1/23 3:50 PM, Vadim Fedorenko wrote:
+static void *__bpf_dynptr_data_ptr(const struct bpf_dynptr_kern *ptr)
+{
+    enum bpf_dynptr_type type;
+
+    if (!ptr->data)
+        return NULL;
+
+    type = bpf_dynptr_get_type(ptr);
+
+    switch (type) {
+    case BPF_DYNPTR_TYPE_LOCAL:
+    case BPF_DYNPTR_TYPE_RINGBUF:
+        return ptr->data + ptr->offset;
+    case BPF_DYNPTR_TYPE_SKB:
+        return skb_pointer_if_linear(ptr->data, ptr->offset, __bpf_dynptr_size(ptr));
+    case BPF_DYNPTR_TYPE_XDP:
+    {
+        void *xdp_ptr = bpf_xdp_pointer(ptr->data, ptr->offset, __bpf_dynptr_size(ptr));

I suspect what it is doing here (for skb and xdp in particular) is very similar to bpf_dynptr_slice. Please check if bpf_dynptr_slice(ptr, 0, NULL, sz) will work.


Well, yes, it's simplified version of bpf_dynptr_slice. The problem is
that bpf_dynptr_slice bpf_kfunc which cannot be used in another
bpf_kfunc. Should I refactor the code to use it in both places? Like

Sorry, scrolled too fast in my earlier reply :(

I am not aware of this limitation. What error does it have?
The bpf_dynptr_slice_rdwr kfunc() is also calling the bpf_dynptr_slice() kfunc.

create __bpf_dynptr_slice() which will be internal part of bpf_kfunc?

Apparently Song has a patch to expose these bpf_dynptr_slice* functions
ton in-kernel users.

https://lore.kernel.org/bpf/20231024235551.2769174-2-song@xxxxxxxxxx/

Should I wait for it to be merged before sending next version?



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