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
|
/*
* This file is part of the Chelsio T4/T5/T6 Ethernet driver for Linux.
*
* Copyright (c) 2017 Chelsio Communications, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "cxgb4.h"
#include "smt.h"
#include "t4_msg.h"
#include "t4fw_api.h"
#include "t4_regs.h"
#include "t4_values.h"
struct smt_data *t4_init_smt(void)
{
unsigned int smt_size;
struct smt_data *s;
int i;
smt_size = SMT_SIZE;
s = kvzalloc(struct_size(s, smtab, smt_size), GFP_KERNEL);
if (!s)
return NULL;
s->smt_size = smt_size;
rwlock_init(&s->lock);
for (i = 0; i < s->smt_size; ++i) {
s->smtab[i].idx = i;
s->smtab[i].state = SMT_STATE_UNUSED;
memset(&s->smtab[i].src_mac, 0, ETH_ALEN);
spin_lock_init(&s->smtab[i].lock);
s->smtab[i].refcnt = 0;
}
return s;
}
static struct smt_entry *find_or_alloc_smte(struct smt_data *s, u8 *smac)
{
struct smt_entry *first_free = NULL;
struct smt_entry *e, *end;
for (e = &s->smtab[0], end = &s->smtab[s->smt_size]; e != end; ++e) {
if (e->refcnt == 0) {
if (!first_free)
first_free = e;
} else {
if (e->state == SMT_STATE_SWITCHING) {
/* This entry is actually in use. See if we can
* re-use it ?
*/
if (memcmp(e->src_mac, smac, ETH_ALEN) == 0)
goto found_reuse;
}
}
}
if (first_free) {
e = first_free;
goto found;
}
return NULL;
found:
e->state = SMT_STATE_UNUSED;
found_reuse:
return e;
}
static void t4_smte_free(struct smt_entry *e)
{
if (e->refcnt == 0) { /* hasn't been recycled */
e->state = SMT_STATE_UNUSED;
}
}
/**
* cxgb4_smt_release - Release SMT entry
* @e: smt entry to release
*
* Releases ref count and frees up an smt entry from SMT table
*/
void cxgb4_smt_release(struct smt_entry *e)
{
spin_lock_bh(&e->lock);
if ((--e->refcnt) == 0)
t4_smte_free(e);
spin_unlock_bh(&e->lock);
}
EXPORT_SYMBOL(cxgb4_smt_release);
void do_smt_write_rpl(struct adapter *adap, const struct cpl_smt_write_rpl *rpl)
{
unsigned int smtidx = TID_TID_G(GET_TID(rpl));
struct smt_data *s = adap->smt;
if (unlikely(rpl->status != CPL_ERR_NONE)) {
struct smt_entry *e = &s->smtab[smtidx];
dev_err(adap->pdev_dev,
"Unexpected SMT_WRITE_RPL status %u for entry %u\n",
rpl->status, smtidx);
spin_lock(&e->lock);
e->state = SMT_STATE_ERROR;
spin_unlock(&e->lock);
return;
}
}
static int write_smt_entry(struct adapter *adapter, struct smt_entry *e)
{
struct cpl_t6_smt_write_req *t6req;
struct smt_data *s = adapter->smt;
struct cpl_smt_write_req *req;
struct sk_buff *skb;
int size;
u8 row;
if (CHELSIO_CHIP_VERSION(adapter->params.chip) <= CHELSIO_T5) {
size = sizeof(*req);
skb = alloc_skb(size, GFP_ATOMIC);
if (!skb)
return -ENOMEM;
/* Source MAC Table (SMT) contains 256 SMAC entries
* organized in 128 rows of 2 entries each.
*/
req = (struct cpl_smt_write_req *)__skb_put(skb, size);
INIT_TP_WR(req, 0);
/* Each row contains an SMAC pair.
* LSB selects the SMAC entry within a row
*/
row = (e->idx >> 1);
if (e->idx & 1) {
req->pfvf1 = 0x0;
memcpy(req->src_mac1, e->src_mac, ETH_ALEN);
/* fill pfvf0/src_mac0 with entry
* at prev index from smt-tab.
*/
req->pfvf0 = 0x0;
memcpy(req->src_mac0, s->smtab[e->idx - 1].src_mac,
ETH_ALEN);
} else {
req->pfvf0 = 0x0;
memcpy(req->src_mac0, e->src_mac, ETH_ALEN);
/* fill pfvf1/src_mac1 with entry
* at next index from smt-tab
*/
req->pfvf1 = 0x0;
memcpy(req->src_mac1, s->smtab[e->idx + 1].src_mac,
ETH_ALEN);
}
} else {
size = sizeof(*t6req);
skb = alloc_skb(size, GFP_ATOMIC);
if (!skb)
return -ENOMEM;
/* Source MAC Table (SMT) contains 256 SMAC entries */
t6req = (struct cpl_t6_smt_write_req *)__skb_put(skb, size);
INIT_TP_WR(t6req, 0);
req = (struct cpl_smt_write_req *)t6req;
/* fill pfvf0/src_mac0 from smt-tab */
req->pfvf0 = 0x0;
memcpy(req->src_mac0, s->smtab[e->idx].src_mac, ETH_ALEN);
row = e->idx;
}
OPCODE_TID(req) =
htonl(MK_OPCODE_TID(CPL_SMT_WRITE_REQ, e->idx |
TID_QID_V(adapter->sge.fw_evtq.abs_id)));
req->params = htonl(SMTW_NORPL_V(0) |
SMTW_IDX_V(row) |
SMTW_OVLAN_IDX_V(0));
t4_mgmt_tx(adapter, skb);
return 0;
}
static struct smt_entry *t4_smt_alloc_switching(struct adapter *adap, u16 pfvf,
u8 *smac)
{
struct smt_data *s = adap->smt;
struct smt_entry *e;
write_lock_bh(&s->lock);
e = find_or_alloc_smte(s, smac);
if (e) {
spin_lock(&e->lock);
if (!e->refcnt) {
e->refcnt = 1;
e->state = SMT_STATE_SWITCHING;
e->pfvf = pfvf;
memcpy(e->src_mac, smac, ETH_ALEN);
write_smt_entry(adap, e);
} else {
++e->refcnt;
}
spin_unlock(&e->lock);
}
write_unlock_bh(&s->lock);
return e;
}
/**
* cxgb4_smt_alloc_switching - Allocates an SMT entry for switch filters.
* @dev: net_device pointer
* @smac: MAC address to add to SMT
* Returns pointer to the SMT entry created
*
* Allocates an SMT entry to be used by switching rule of a filter.
*/
struct smt_entry *cxgb4_smt_alloc_switching(struct net_device *dev, u8 *smac)
{
struct adapter *adap = netdev2adap(dev);
return t4_smt_alloc_switching(adap, 0x0, smac);
}
EXPORT_SYMBOL(cxgb4_smt_alloc_switching);
|
