1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2/* Copyright (C) 2018 Netronome Systems, Inc. */
3
4#include <linux/kernel.h>
5#include <net/devlink.h>
6
7#include "nfpcore/nfp_cpp.h"
8#include "nfpcore/nfp_nffw.h"
9#include "nfp_abi.h"
10#include "nfp_app.h"
11#include "nfp_main.h"
12
13static u32 nfp_shared_buf_pool_unit(struct nfp_pf *pf, unsigned int sb)
14{
15	__le32 sb_id = cpu_to_le32(sb);
16	unsigned int i;
17
18	for (i = 0; i < pf->num_shared_bufs; i++)
19		if (pf->shared_bufs[i].id == sb_id)
20			return le32_to_cpu(pf->shared_bufs[i].pool_size_unit);
21
22	WARN_ON_ONCE(1);
23	return 0;
24}
25
26int nfp_shared_buf_pool_get(struct nfp_pf *pf, unsigned int sb, u16 pool_index,
27			    struct devlink_sb_pool_info *pool_info)
28{
29	struct nfp_shared_buf_pool_info_get get_data;
30	struct nfp_shared_buf_pool_id id = {
31		.shared_buf	= cpu_to_le32(sb),
32		.pool		= cpu_to_le32(pool_index),
33	};
34	unsigned int unit_size;
35	int n;
36
37	unit_size = nfp_shared_buf_pool_unit(pf, sb);
38	if (!unit_size)
39		return -EINVAL;
40
41	n = nfp_mbox_cmd(pf, NFP_MBOX_POOL_GET, &id, sizeof(id),
42			 &get_data, sizeof(get_data));
43	if (n < 0)
44		return n;
45	if (n < sizeof(get_data))
46		return -EIO;
47
48	pool_info->pool_type = le32_to_cpu(get_data.pool_type);
49	pool_info->threshold_type = le32_to_cpu(get_data.threshold_type);
50	pool_info->size = le32_to_cpu(get_data.size) * unit_size;
51	pool_info->cell_size = unit_size;
52
53	return 0;
54}
55
56int nfp_shared_buf_pool_set(struct nfp_pf *pf, unsigned int sb,
57			    u16 pool_index, u32 size,
58			    enum devlink_sb_threshold_type threshold_type)
59{
60	struct nfp_shared_buf_pool_info_set set_data = {
61		.id = {
62			.shared_buf	= cpu_to_le32(sb),
63			.pool		= cpu_to_le32(pool_index),
64		},
65		.threshold_type	= cpu_to_le32(threshold_type),
66	};
67	unsigned int unit_size;
68
69	unit_size = nfp_shared_buf_pool_unit(pf, sb);
70	if (!unit_size || size % unit_size)
71		return -EINVAL;
72	set_data.size = cpu_to_le32(size / unit_size);
73
74	return nfp_mbox_cmd(pf, NFP_MBOX_POOL_SET, &set_data, sizeof(set_data),
75			    NULL, 0);
76}
77
78int nfp_shared_buf_register(struct nfp_pf *pf)
79{
80	struct devlink *devlink = priv_to_devlink(pf);
81	unsigned int i, num_entries, entry_sz;
82	struct nfp_cpp_area *sb_desc_area;
83	u8 __iomem *sb_desc;
84	int n, err;
85
86	if (!pf->mbox)
87		return 0;
88
89	n = nfp_pf_rtsym_read_optional(pf, NFP_SHARED_BUF_COUNT_SYM_NAME, 0);
90	if (n <= 0)
91		return n;
92	num_entries = n;
93
94	sb_desc = nfp_pf_map_rtsym(pf, "sb_tbl", NFP_SHARED_BUF_TABLE_SYM_NAME,
95				   num_entries * sizeof(pf->shared_bufs[0]),
96				   &sb_desc_area);
97	if (IS_ERR(sb_desc))
98		return PTR_ERR(sb_desc);
99
100	entry_sz = nfp_cpp_area_size(sb_desc_area) / num_entries;
101
102	pf->shared_bufs = kmalloc_array(num_entries, sizeof(pf->shared_bufs[0]),
103					GFP_KERNEL);
104	if (!pf->shared_bufs) {
105		err = -ENOMEM;
106		goto err_release_area;
107	}
108
109	for (i = 0; i < num_entries; i++) {
110		struct nfp_shared_buf *sb = &pf->shared_bufs[i];
111
112		/* Entries may be larger in future FW */
113		memcpy_fromio(sb, sb_desc + i * entry_sz, sizeof(*sb));
114
115		err = devlink_sb_register(devlink,
116					  le32_to_cpu(sb->id),
117					  le32_to_cpu(sb->size),
118					  le16_to_cpu(sb->ingress_pools_count),
119					  le16_to_cpu(sb->egress_pools_count),
120					  le16_to_cpu(sb->ingress_tc_count),
121					  le16_to_cpu(sb->egress_tc_count));
122		if (err)
123			goto err_unreg_prev;
124	}
125	pf->num_shared_bufs = num_entries;
126
127	nfp_cpp_area_release_free(sb_desc_area);
128
129	return 0;
130
131err_unreg_prev:
132	while (i--)
133		devlink_sb_unregister(devlink,
134				      le32_to_cpu(pf->shared_bufs[i].id));
135	kfree(pf->shared_bufs);
136err_release_area:
137	nfp_cpp_area_release_free(sb_desc_area);
138	return err;
139}
140
141void nfp_shared_buf_unregister(struct nfp_pf *pf)
142{
143	struct devlink *devlink = priv_to_devlink(pf);
144	unsigned int i;
145
146	for (i = 0; i < pf->num_shared_bufs; i++)
147		devlink_sb_unregister(devlink,
148				      le32_to_cpu(pf->shared_bufs[i].id));
149	kfree(pf->shared_bufs);
150}
151