diff mbox series

[RFC,bpf-next,39/52] net, xdp: make &xdp_attachment_info a bit more useful in drivers

Message ID 20220628194812.1453059-40-alexandr.lobakin@intel.com (mailing list archive)
State RFC
Delegated to: BPF
Headers show
Series bpf, xdp: introduce and use Generic Hints/metadata | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-PR fail PR summary
bpf/vmtest-bpf-next-VM_Test-1 fail Logs for Kernel LATEST on ubuntu-latest with gcc
bpf/vmtest-bpf-next-VM_Test-2 fail Logs for Kernel LATEST on ubuntu-latest with llvm-15
bpf/vmtest-bpf-next-VM_Test-3 fail Logs for Kernel LATEST on z15 with gcc
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/apply fail Patch does not apply to bpf-next

Commit Message

Alexander Lobakin June 28, 2022, 7:47 p.m. UTC 
Add a new field which will store an arbitrary 'driver cookie', the
closest usage is to store enum there corresponding to the metadata
types supported by a driver to shortcut them on hotpath.
In fact, it's just reusing the 4-byte padding at the end.
Also, make it possible to store BTF ID in LE rather than CPU
byteorder, so that drivers could save some cycles on [potential]
byteswapping on hotpath.

Signed-off-by: Alexander Lobakin <alexandr.lobakin@intel.com>
---
 include/net/xdp.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/include/net/xdp.h b/include/net/xdp.h
index d1fd809655be..5762ce18885f 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -380,8 +380,12 @@  void xdp_unreg_mem_model(struct xdp_mem_info *mem);
 
 struct xdp_attachment_info {
 	struct bpf_prog *prog;
-	u64 btf_id;
+	union {
+		__le64 btf_id_le;
+		u64 btf_id;
+	};
 	u32 meta_thresh;
+	u32 drv_cookie;
 };
 
 struct netdev_bpf;