1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
|
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2018 Netronome Systems, Inc. */
#include <linux/bitfield.h>
#include <net/pkt_cls.h>
#include "../nfpcore/nfp_cpp.h"
#include "../nfp_app.h"
#include "../nfp_net_repr.h"
#include "main.h"
struct nfp_abm_u32_match {
u32 handle;
u32 band;
u8 mask;
u8 val;
struct list_head list;
};
static bool
nfp_abm_u32_check_knode(struct nfp_abm *abm, struct tc_cls_u32_knode *knode,
__be16 proto, struct netlink_ext_ack *extack)
{
struct tc_u32_key *k;
unsigned int tos_off;
if (knode->exts && tcf_exts_has_actions(knode->exts)) {
NL_SET_ERR_MSG_MOD(extack, "action offload not supported");
return false;
}
if (knode->link_handle) {
NL_SET_ERR_MSG_MOD(extack, "linking not supported");
return false;
}
if (knode->sel->flags != TC_U32_TERMINAL) {
NL_SET_ERR_MSG_MOD(extack,
"flags must be equal to TC_U32_TERMINAL");
return false;
}
if (knode->sel->off || knode->sel->offshift || knode->sel->offmask ||
knode->sel->offoff || knode->fshift) {
NL_SET_ERR_MSG_MOD(extack, "variable offsetting not supported");
return false;
}
if (knode->sel->hoff || knode->sel->hmask) {
NL_SET_ERR_MSG_MOD(extack, "hashing not supported");
return false;
}
if (knode->val || knode->mask) {
NL_SET_ERR_MSG_MOD(extack, "matching on mark not supported");
return false;
}
if (knode->res && knode->res->class) {
NL_SET_ERR_MSG_MOD(extack, "setting non-0 class not supported");
return false;
}
if (knode->res && knode->res->classid >= abm->num_bands) {
NL_SET_ERR_MSG_MOD(extack,
"classid higher than number of bands");
return false;
}
if (knode->sel->nkeys != 1) {
NL_SET_ERR_MSG_MOD(extack, "exactly one key required");
return false;
}
switch (proto) {
case htons(ETH_P_IP):
tos_off = 16;
break;
case htons(ETH_P_IPV6):
tos_off = 20;
break;
default:
NL_SET_ERR_MSG_MOD(extack, "only IP and IPv6 supported as filter protocol");
return false;
}
k = &knode->sel->keys[0];
if (k->offmask) {
NL_SET_ERR_MSG_MOD(extack, "offset mask - variable offsetting not supported");
return false;
}
if (k->off) {
NL_SET_ERR_MSG_MOD(extack, "only DSCP fields can be matched");
return false;
}
if (k->val & ~k->mask) {
NL_SET_ERR_MSG_MOD(extack, "mask does not cover the key");
return false;
}
if (be32_to_cpu(k->mask) >> tos_off & ~abm->dscp_mask) {
NL_SET_ERR_MSG_MOD(extack, "only high DSCP class selector bits can be used");
nfp_err(abm->app->cpp,
"u32 offload: requested mask %x FW can support only %x\n",
be32_to_cpu(k->mask) >> tos_off, abm->dscp_mask);
return false;
}
return true;
}
/* This filter list -> map conversion is O(n * m), we expect single digit or
* low double digit number of prios and likewise for the filters. Also u32
* doesn't report stats, so it's really only setup time cost.
*/
static unsigned int
nfp_abm_find_band_for_prio(struct nfp_abm_link *alink, unsigned int prio)
{
struct nfp_abm_u32_match *iter;
list_for_each_entry(iter, &alink->dscp_map, list)
if ((prio & iter->mask) == iter->val)
return iter->band;
return alink->def_band;
}
static int nfp_abm_update_band_map(struct nfp_abm_link *alink)
{
unsigned int i, bits_per_prio, prios_per_word, base_shift;
struct nfp_abm *abm = alink->abm;
u32 field_mask;
alink->has_prio = !list_empty(&alink->dscp_map);
bits_per_prio = roundup_pow_of_two(order_base_2(abm->num_bands));
field_mask = (1 << bits_per_prio) - 1;
prios_per_word = sizeof(u32) * BITS_PER_BYTE / bits_per_prio;
/* FW mask applies from top bits */
base_shift = 8 - order_base_2(abm->num_prios);
for (i = 0; i < abm->num_prios; i++) {
unsigned int offset;
u32 *word;
u8 band;
word = &alink->prio_map[i / prios_per_word];
offset = (i % prios_per_word) * bits_per_prio;
band = nfp_abm_find_band_for_prio(alink, i << base_shift);
*word &= ~(field_mask << offset);
*word |= band << offset;
}
/* Qdisc offload status may change if has_prio changed */
nfp_abm_qdisc_offload_update(alink);
return nfp_abm_ctrl_prio_map_update(alink, alink->prio_map);
}
static void
nfp_abm_u32_knode_delete(struct nfp_abm_link *alink,
struct tc_cls_u32_knode *knode)
{
struct nfp_abm_u32_match *iter;
list_for_each_entry(iter, &alink->dscp_map, list)
if (iter->handle == knode->handle) {
list_del(&iter->list);
kfree(iter);
nfp_abm_update_band_map(alink);
return;
}
}
static int
nfp_abm_u32_knode_replace(struct nfp_abm_link *alink,
struct tc_cls_u32_knode *knode,
__be16 proto, struct netlink_ext_ack *extack)
{
struct nfp_abm_u32_match *match = NULL, *iter;
unsigned int tos_off;
u8 mask, val;
int err;
if (!nfp_abm_u32_check_knode(alink->abm, knode, proto, extack))
goto err_delete;
tos_off = proto == htons(ETH_P_IP) ? 16 : 20;
/* Extract the DSCP Class Selector bits */
val = be32_to_cpu(knode->sel->keys[0].val) >> tos_off & 0xff;
mask = be32_to_cpu(knode->sel->keys[0].mask) >> tos_off & 0xff;
/* Check if there is no conflicting mapping and find match by handle */
list_for_each_entry(iter, &alink->dscp_map, list) {
u32 cmask;
if (iter->handle == knode->handle) {
match = iter;
continue;
}
cmask = iter->mask & mask;
if ((iter->val & cmask) == (val & cmask) &&
iter->band != knode->res->classid) {
NL_SET_ERR_MSG_MOD(extack, "conflict with already offloaded filter");
goto err_delete;
}
}
if (!match) {
match = kzalloc(sizeof(*match), GFP_KERNEL);
if (!match)
return -ENOMEM;
list_add(&match->list, &alink->dscp_map);
}
match->handle = knode->handle;
match->band = knode->res->classid;
match->mask = mask;
match->val = val;
err = nfp_abm_update_band_map(alink);
if (err)
goto err_delete;
return 0;
err_delete:
nfp_abm_u32_knode_delete(alink, knode);
return -EOPNOTSUPP;
}
static int nfp_abm_setup_tc_block_cb(enum tc_setup_type type,
void *type_data, void *cb_priv)
{
struct tc_cls_u32_offload *cls_u32 = type_data;
struct nfp_repr *repr = cb_priv;
struct nfp_abm_link *alink;
alink = repr->app_priv;
if (type != TC_SETUP_CLSU32) {
NL_SET_ERR_MSG_MOD(cls_u32->common.extack,
"only offload of u32 classifier supported");
return -EOPNOTSUPP;
}
if (!tc_cls_can_offload_and_chain0(repr->netdev, &cls_u32->common))
return -EOPNOTSUPP;
if (cls_u32->common.protocol != htons(ETH_P_IP) &&
cls_u32->common.protocol != htons(ETH_P_IPV6)) {
NL_SET_ERR_MSG_MOD(cls_u32->common.extack,
"only IP and IPv6 supported as filter protocol");
return -EOPNOTSUPP;
}
switch (cls_u32->command) {
case TC_CLSU32_NEW_KNODE:
case TC_CLSU32_REPLACE_KNODE:
return nfp_abm_u32_knode_replace(alink, &cls_u32->knode,
cls_u32->common.protocol,
cls_u32->common.extack);
case TC_CLSU32_DELETE_KNODE:
nfp_abm_u32_knode_delete(alink, &cls_u32->knode);
return 0;
default:
return -EOPNOTSUPP;
}
}
static LIST_HEAD(nfp_abm_block_cb_list);
int nfp_abm_setup_cls_block(struct net_device *netdev, struct nfp_repr *repr,
struct flow_block_offload *f)
{
return flow_block_cb_setup_simple(f, &nfp_abm_block_cb_list,
nfp_abm_setup_tc_block_cb,
repr, repr, true);
}
|
