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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>
25 lines
548 B
C
25 lines
548 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _NET_RPS_TYPES_H
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#define _NET_RPS_TYPES_H
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/* Define a rps_tag_ptr:
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* Low order 5 bits are used to store the ilog2(size) of an RPS table.
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*/
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typedef unsigned long rps_tag_ptr;
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static inline u8 rps_tag_to_log(rps_tag_ptr tag_ptr)
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{
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return tag_ptr & 31U;
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}
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static inline u32 rps_tag_to_mask(rps_tag_ptr tag_ptr)
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{
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return (1U << rps_tag_to_log(tag_ptr)) - 1;
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}
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static inline void *rps_tag_to_table(rps_tag_ptr tag_ptr)
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{
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return (void *)(tag_ptr & ~31UL);
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}
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#endif /* _NET_RPS_TYPES_H */
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