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
32 extern 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 */
42 static 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
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