net/hns3: fix timing of clearing interrupt source
[dpdk.git] / drivers / net / cxgbe / clip_tbl.c
1 /* SPDX-License-Identifier: BSD-3-Clause
2  * Copyright(c) 2018 Chelsio Communications.
3  * All rights reserved.
4  */
5
6 #include "base/common.h"
7 #include "clip_tbl.h"
8
9 /**
10  * Allocate clip entry in HW with associated IPV4/IPv6 address
11  */
12 static int clip6_get_mbox(const struct rte_eth_dev *dev, const u32 *lip)
13 {
14         struct adapter *adap = ethdev2adap(dev);
15         struct fw_clip_cmd c;
16         u64 hi = ((u64)lip[1]) << 32 | lip[0];
17         u64 lo = ((u64)lip[3]) << 32 | lip[2];
18
19         memset(&c, 0, sizeof(c));
20         c.op_to_write = cpu_to_be32(V_FW_CMD_OP(FW_CLIP_CMD) |
21                                     F_FW_CMD_REQUEST | F_FW_CMD_WRITE);
22         c.alloc_to_len16 = cpu_to_be32(F_FW_CLIP_CMD_ALLOC | FW_LEN16(c));
23         c.ip_hi = hi;
24         c.ip_lo = lo;
25         return t4_wr_mbox_meat(adap, adap->mbox, &c, sizeof(c), &c, false);
26 }
27
28 /**
29  * Delete clip entry in HW having the associated IPV4/IPV6 address
30  */
31 static int clip6_release_mbox(const struct rte_eth_dev *dev, const u32 *lip)
32 {
33         struct adapter *adap = ethdev2adap(dev);
34         struct fw_clip_cmd c;
35         u64 hi = ((u64)lip[1]) << 32 | lip[0];
36         u64 lo = ((u64)lip[3]) << 32 | lip[2];
37
38         memset(&c, 0, sizeof(c));
39         c.op_to_write = cpu_to_be32(V_FW_CMD_OP(FW_CLIP_CMD) |
40                                     F_FW_CMD_REQUEST | F_FW_CMD_READ);
41         c.alloc_to_len16 = cpu_to_be32(F_FW_CLIP_CMD_FREE | FW_LEN16(c));
42         c.ip_hi = hi;
43         c.ip_lo = lo;
44         return t4_wr_mbox_meat(adap, adap->mbox, &c, sizeof(c), &c, false);
45 }
46
47 /**
48  * cxgbe_clip_release - Release associated CLIP entry
49  * @ce: clip entry to release
50  *
51  * Releases ref count and frees up a clip entry from CLIP table
52  */
53 void cxgbe_clip_release(struct rte_eth_dev *dev, struct clip_entry *ce)
54 {
55         int ret;
56
57         t4_os_lock(&ce->lock);
58         if (__atomic_sub_fetch(&ce->refcnt, 1, __ATOMIC_RELAXED) == 0) {
59                 ret = clip6_release_mbox(dev, ce->addr);
60                 if (ret)
61                         dev_debug(adap, "CLIP FW DEL CMD failed: %d", ret);
62         }
63         t4_os_unlock(&ce->lock);
64 }
65
66 /**
67  * find_or_alloc_clipe - Find/Allocate a free CLIP entry
68  * @c: CLIP table
69  * @lip: IPV4/IPV6 address to compare/add
70  * Returns pointer to the IPV4/IPV6 entry found/created
71  *
72  * Finds/Allocates an CLIP entry to be used for a filter rule.
73  */
74 static struct clip_entry *find_or_alloc_clipe(struct clip_tbl *c,
75                                               const u32 *lip)
76 {
77         struct clip_entry *end, *e;
78         struct clip_entry *first_free = NULL;
79         unsigned int clipt_size = c->clipt_size;
80
81         for (e = &c->cl_list[0], end = &c->cl_list[clipt_size]; e != end; ++e) {
82                 if (__atomic_load_n(&e->refcnt, __ATOMIC_RELAXED) == 0) {
83                         if (!first_free)
84                                 first_free = e;
85                 } else {
86                         if (memcmp(lip, e->addr, sizeof(e->addr)) == 0)
87                                 goto exists;
88                 }
89         }
90
91         if (first_free) {
92                 e = first_free;
93                 goto exists;
94         }
95
96         return NULL;
97
98 exists:
99         return e;
100 }
101
102 static struct clip_entry *t4_clip_alloc(struct rte_eth_dev *dev,
103                                         u32 *lip, u8 v6)
104 {
105         struct adapter *adap = ethdev2adap(dev);
106         struct clip_tbl *ctbl = adap->clipt;
107         struct clip_entry *ce;
108         int ret = 0;
109
110         if (!ctbl)
111                 return NULL;
112
113         t4_os_write_lock(&ctbl->lock);
114         ce = find_or_alloc_clipe(ctbl, lip);
115         if (ce) {
116                 t4_os_lock(&ce->lock);
117                 if (__atomic_load_n(&ce->refcnt, __ATOMIC_RELAXED) == 0) {
118                         rte_memcpy(ce->addr, lip, sizeof(ce->addr));
119                         if (v6) {
120                                 ce->type = FILTER_TYPE_IPV6;
121                                 __atomic_store_n(&ce->refcnt, 1,
122                                                  __ATOMIC_RELAXED);
123                                 ret = clip6_get_mbox(dev, lip);
124                                 if (ret)
125                                         dev_debug(adap,
126                                                   "CLIP FW ADD CMD failed: %d",
127                                                   ret);
128                         } else {
129                                 ce->type = FILTER_TYPE_IPV4;
130                         }
131                 } else {
132                         __atomic_add_fetch(&ce->refcnt, 1, __ATOMIC_RELAXED);
133                 }
134                 t4_os_unlock(&ce->lock);
135         }
136         t4_os_write_unlock(&ctbl->lock);
137
138         return ret ? NULL : ce;
139 }
140
141 /**
142  * cxgbe_clip_alloc - Allocate a IPV6 CLIP entry
143  * @dev: rte_eth_dev pointer
144  * @lip: IPV6 address to add
145  * Returns pointer to the CLIP entry created
146  *
147  * Allocates a IPV6 CLIP entry to be used for a filter rule.
148  */
149 struct clip_entry *cxgbe_clip_alloc(struct rte_eth_dev *dev, u32 *lip)
150 {
151         return t4_clip_alloc(dev, lip, FILTER_TYPE_IPV6);
152 }
153
154 /**
155  * Initialize CLIP Table
156  */
157 struct clip_tbl *t4_init_clip_tbl(unsigned int clipt_start,
158                                   unsigned int clipt_end)
159 {
160         unsigned int clipt_size;
161         struct clip_tbl *ctbl;
162         unsigned int i;
163
164         if (clipt_start >= clipt_end)
165                 return NULL;
166
167         clipt_size = clipt_end - clipt_start + 1;
168
169         ctbl = t4_os_alloc(sizeof(*ctbl) +
170                            clipt_size * sizeof(struct clip_entry));
171         if (!ctbl)
172                 return NULL;
173
174         ctbl->clipt_start = clipt_start;
175         ctbl->clipt_size = clipt_size;
176
177         t4_os_rwlock_init(&ctbl->lock);
178
179         for (i = 0; i < ctbl->clipt_size; i++) {
180                 t4_os_lock_init(&ctbl->cl_list[i].lock);
181                 ctbl->cl_list[i].refcnt = 0;
182         }
183
184         return ctbl;
185 }
186
187 /**
188  * Cleanup CLIP Table
189  */
190 void t4_cleanup_clip_tbl(struct adapter *adap)
191 {
192         if (adap->clipt)
193                 t4_os_free(adap->clipt);
194 }