1/* SPDX-License-Identifier: GPL-2.0-only */
2/* Copyright (C) 2024 Intel Corporation */
3
4#ifndef __LIBIE_RX_H
5#define __LIBIE_RX_H
6
7#include <net/libeth/rx.h>
8
9/* Rx buffer management */
10
11/* The largest size for a single descriptor as per HW */
12#define LIBIE_MAX_RX_BUF_LEN	9728U
13/* "True" HW-writeable space: minimum from SW and HW values */
14#define LIBIE_RX_BUF_LEN(hr)	min_t(u32, LIBETH_RX_PAGE_LEN(hr),	\
15				      LIBIE_MAX_RX_BUF_LEN)
16
17/* The maximum frame size as per HW (S/G) */
18#define __LIBIE_MAX_RX_FRM_LEN	16382U
19/* ATST, HW can chain up to 5 Rx descriptors */
20#define LIBIE_MAX_RX_FRM_LEN(hr)					\
21	min_t(u32, __LIBIE_MAX_RX_FRM_LEN, LIBIE_RX_BUF_LEN(hr) * 5)
22/* Maximum frame size minus LL overhead */
23#define LIBIE_MAX_MTU							\
24	(LIBIE_MAX_RX_FRM_LEN(LIBETH_MAX_HEADROOM) - LIBETH_RX_LL_LEN)
25
26/* O(1) converting i40e/ice/iavf's 8/10-bit hardware packet type to a parsed
27 * bitfield struct.
28 */
29
30#define LIBIE_RX_PT_NUM		154
31
32extern const struct libeth_rx_pt libie_rx_pt_lut[LIBIE_RX_PT_NUM];
33
34/**
35 * libie_rx_pt_parse - convert HW packet type to software bitfield structure
36 * @pt: 10-bit hardware packet type value from the descriptor
37 *
38 * ```libie_rx_pt_lut``` must be accessed only using this wrapper.
39 *
40 * Return: parsed bitfield struct corresponding to the provided ptype.
41 */
42static inline struct libeth_rx_pt libie_rx_pt_parse(u32 pt)
43{
44	if (unlikely(pt >= LIBIE_RX_PT_NUM))
45		pt = 0;
46
47	return libie_rx_pt_lut[pt];
48}
49
50#endif /* __LIBIE_RX_H */
51