Commit 42a10177 authored by Eric Dumazet's avatar Eric Dumazet Committed by Jakub Kicinski
Browse files

net: add rps_tag_ptr type and helpers 



Add a new rps_tag_ptr type to encode a pointer and a size
to a power-of-two table.

Three helpers are added converting an rps_tag_ptr to:

1) A log of the size.

2) A mask : (size - 1).

3) A pointer to the array.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Reviewed-by: default avatarKuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260302181432.1836150-2-edumazet@google.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent c26b8c4e

include/net/rps-types.h

0 → 100644
+24 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0-or-later */

#ifndef _NET_RPS_TYPES_H

#define _NET_RPS_TYPES_H



/* Define a rps_tag_ptr:

 * Low order 5 bits are used to store the ilog2(size) of an RPS table.

 */

typedef unsigned long rps_tag_ptr;



static inline u8 rps_tag_to_log(rps_tag_ptr tag_ptr)

{

	return tag_ptr & 31U;

}



static inline u32 rps_tag_to_mask(rps_tag_ptr tag_ptr)

{

	return (1U << rps_tag_to_log(tag_ptr)) - 1;

}



static inline void *rps_tag_to_table(rps_tag_ptr tag_ptr)

{

	return (void *)(tag_ptr & ~31UL);

}

#endif /* _NET_RPS_TYPES_H */