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
|
/*
* BSD LICENSE
*
* Copyright (C) Cavium networks Ltd. 2017.
*
* 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.
* * Neither the name of Cavium networks nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <string.h>
#include <rte_atomic.h>
#include <rte_common.h>
#include <rte_cycles.h>
#include <rte_io.h>
#include <rte_spinlock.h>
#include "ssovf_evdev.h"
/* Mbox operation timeout in seconds */
#define MBOX_WAIT_TIME_SEC 3
#define MAX_RAM_MBOX_LEN ((SSOW_BAR4_LEN >> 1) - 8 /* Mbox header */)
/* Mbox channel state */
enum {
MBOX_CHAN_STATE_REQ = 1,
MBOX_CHAN_STATE_RES = 0,
};
/* Response messages */
enum {
MBOX_RET_SUCCESS,
MBOX_RET_INVALID,
MBOX_RET_INTERNAL_ERR,
};
struct mbox {
int init_once;
uint8_t *ram_mbox_base; /* Base address of mbox message stored in ram */
uint8_t *reg; /* Store to this register triggers PF mbox interrupt */
uint16_t tag_own; /* Last tag which was written to own channel */
rte_spinlock_t lock;
};
static struct mbox octeontx_mbox;
/*
* Structure used for mbox synchronization
* This structure sits at the begin of Mbox RAM and used as main
* synchronization point for channel communication
*/
struct mbox_ram_hdr {
union {
uint64_t u64;
struct {
uint8_t chan_state : 1;
uint8_t coproc : 7;
uint8_t msg;
uint8_t vfid;
uint8_t res_code;
uint16_t tag;
uint16_t len;
};
};
};
static inline void
mbox_send_request(struct mbox *m, struct octeontx_mbox_hdr *hdr,
const void *txmsg, uint16_t txsize)
{
struct mbox_ram_hdr old_hdr;
struct mbox_ram_hdr new_hdr = { {0} };
uint64_t *ram_mbox_hdr = (uint64_t *)m->ram_mbox_base;
uint8_t *ram_mbox_msg = m->ram_mbox_base + sizeof(struct mbox_ram_hdr);
/*
* Initialize the channel with the tag left by last send.
* On success full mbox send complete, PF increments the tag by one.
* The sender can validate integrity of PF message with this scheme
*/
old_hdr.u64 = rte_read64(ram_mbox_hdr);
m->tag_own = (old_hdr.tag + 2) & (~0x1ul); /* next even number */
/* Copy msg body */
if (txmsg)
memcpy(ram_mbox_msg, txmsg, txsize);
/* Prepare new hdr */
new_hdr.chan_state = MBOX_CHAN_STATE_REQ;
new_hdr.coproc = hdr->coproc;
new_hdr.msg = hdr->msg;
new_hdr.vfid = hdr->vfid;
new_hdr.tag = m->tag_own;
new_hdr.len = txsize;
/* Write the msg header */
rte_write64(new_hdr.u64, ram_mbox_hdr);
rte_io_wmb();
/* Notify PF about the new msg - write to MBOX reg generates PF IRQ */
rte_write64(0, m->reg);
}
static inline int
mbox_wait_response(struct mbox *m, struct octeontx_mbox_hdr *hdr,
void *rxmsg, uint16_t rxsize)
{
int res = 0, wait;
uint16_t len;
struct mbox_ram_hdr rx_hdr;
uint64_t *ram_mbox_hdr = (uint64_t *)m->ram_mbox_base;
uint8_t *ram_mbox_msg = m->ram_mbox_base + sizeof(struct mbox_ram_hdr);
/* Wait for response */
wait = MBOX_WAIT_TIME_SEC * 1000 * 10;
while (wait > 0) {
rte_delay_us(100);
rx_hdr.u64 = rte_read64(ram_mbox_hdr);
if (rx_hdr.chan_state == MBOX_CHAN_STATE_RES)
break;
--wait;
}
hdr->res_code = rx_hdr.res_code;
m->tag_own++;
/* Timeout */
if (wait <= 0) {
res = -ETIMEDOUT;
goto error;
}
/* Tag mismatch */
if (m->tag_own != rx_hdr.tag) {
res = -EINVAL;
goto error;
}
/* PF nacked the msg */
if (rx_hdr.res_code != MBOX_RET_SUCCESS) {
res = -EBADMSG;
goto error;
}
len = RTE_MIN(rx_hdr.len, rxsize);
if (rxmsg)
memcpy(rxmsg, ram_mbox_msg, len);
return len;
error:
ssovf_log_err("Failed to send mbox(%d/%d) coproc=%d msg=%d ret=(%d,%d)",
m->tag_own, rx_hdr.tag, hdr->msg, hdr->coproc, res,
hdr->res_code);
return res;
}
static inline int
mbox_send(struct mbox *m, struct octeontx_mbox_hdr *hdr, const void *txmsg,
uint16_t txsize, void *rxmsg, uint16_t rxsize)
{
int res = -EINVAL;
if (m->init_once == 0 || hdr == NULL ||
txsize > MAX_RAM_MBOX_LEN || rxsize > MAX_RAM_MBOX_LEN) {
ssovf_log_err("Invalid init_once=%d hdr=%p txsz=%d rxsz=%d",
m->init_once, hdr, txsize, rxsize);
return res;
}
rte_spinlock_lock(&m->lock);
mbox_send_request(m, hdr, txmsg, txsize);
res = mbox_wait_response(m, hdr, rxmsg, rxsize);
rte_spinlock_unlock(&m->lock);
return res;
}
static inline int
mbox_setup(struct mbox *m)
{
if (unlikely(m->init_once == 0)) {
rte_spinlock_init(&m->lock);
m->ram_mbox_base = octeontx_ssovf_bar(OCTEONTX_SSO_HWS, 0, 4);
m->reg = octeontx_ssovf_bar(OCTEONTX_SSO_GROUP, 0, 0);
m->reg += SSO_VHGRP_PF_MBOX(1);
if (m->ram_mbox_base == NULL || m->reg == NULL) {
ssovf_log_err("Invalid ram_mbox_base=%p or reg=%p",
m->ram_mbox_base, m->reg);
return -EINVAL;
}
m->init_once = 1;
}
return 0;
}
int
octeontx_ssovf_mbox_send(struct octeontx_mbox_hdr *hdr, void *txdata,
uint16_t txlen, void *rxdata, uint16_t rxlen)
{
struct mbox *m = &octeontx_mbox;
RTE_BUILD_BUG_ON(sizeof(struct mbox_ram_hdr) != 8);
if (rte_eal_process_type() != RTE_PROC_PRIMARY || mbox_setup(m))
return -EINVAL;
return mbox_send(m, hdr, txdata, txlen, rxdata, rxlen);
}
|
