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net: add rps_tag_ptr type and helpers

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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: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260302181432.1836150-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2026-03-02 18:14:26 +00:00 committed by Jakub Kicinski
parent c26b8c4e29
commit 42a101775b
1 changed files with 24 additions and 0 deletions
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24
include/net/rps-types.h Normal file
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/* 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 */