Shad Ansari | 2f7f9be | 2017-06-07 13:34:53 -0700 | [diff] [blame] | 1 | /* |
| 2 | <:copyright-BRCM:2016:DUAL/GPL:standard |
| 3 | |
| 4 | Broadcom Proprietary and Confidential.(c) 2016 Broadcom |
| 5 | All Rights Reserved |
| 6 | |
| 7 | Unless you and Broadcom execute a separate written software license |
| 8 | agreement governing use of this software, this software is licensed |
| 9 | to you under the terms of the GNU General Public License version 2 |
| 10 | (the "GPL"), available at http://www.broadcom.com/licenses/GPLv2.php, |
| 11 | with the following added to such license: |
| 12 | |
| 13 | As a special exception, the copyright holders of this software give |
| 14 | you permission to link this software with independent modules, and |
| 15 | to copy and distribute the resulting executable under terms of your |
| 16 | choice, provided that you also meet, for each linked independent |
| 17 | module, the terms and conditions of the license of that module. |
| 18 | An independent module is a module which is not derived from this |
| 19 | software. The special exception does not apply to any modifications |
| 20 | of the software. |
| 21 | |
| 22 | Not withstanding the above, under no circumstances may you combine |
| 23 | this software in any way with any other Broadcom software provided |
| 24 | under a license other than the GPL, without Broadcom's express prior |
| 25 | written consent. |
| 26 | |
| 27 | :> |
| 28 | */ |
| 29 | #include <bcmtr_pcie.h> |
| 30 | #include <bcmolt_tr_pcie_specific.h> |
| 31 | #include "bcmtr_pcie_sw_queue.h" |
| 32 | |
| 33 | /* |
| 34 | * bcm_pcie_sw_queue.c |
| 35 | * Software layer on top of low level PCIe driver that adds support |
| 36 | * for s/w queue and priority |
| 37 | */ |
| 38 | typedef struct |
| 39 | { |
| 40 | bcmos_buf_queue txq; /* Transmit queue */ |
| 41 | bcmos_buf_queue rxq; /* Receive queue */ |
| 42 | uint32_t max_hwq_size; |
| 43 | uint32_t max_swq_size; |
| 44 | bcmtr_swq_rx_cb rx_cb; /* Optional rx_cb for callback-based RX buffer delivery */ |
| 45 | } pcie_swq; |
| 46 | |
| 47 | static pcie_swq swq_info[BCMTR_MAX_OLTS][BCMTR_PCIE_PRTY__NUM_OF]; |
| 48 | static uint32_t hwq_occupancy[BCMTR_MAX_OLTS]; /* Number of unacknowledged buffers in hw tx queue */ |
| 49 | static bcmos_bool swq_initialized[BCMTR_MAX_OLTS]; |
| 50 | static bcmos_fastlock tx_lock[BCMTR_MAX_OLTS]; |
| 51 | static bcmos_fastlock rx_lock[BCMTR_MAX_OLTS]; |
| 52 | |
| 53 | #define BCMTR_SWQ_GET_RETURN_IF_ERROR(device,prty,swq) \ |
| 54 | do { \ |
| 55 | if (device >= BCMTR_MAX_OLTS) \ |
| 56 | return BCM_ERR_PARM; \ |
| 57 | swq = &swq_info[device][prty]; \ |
| 58 | } while (0) |
| 59 | |
| 60 | static inline long _bcmtr_swq_tx_lock(uint8_t device) |
| 61 | { |
| 62 | return bcmos_fastlock_lock(&tx_lock[device]); |
| 63 | } |
| 64 | |
| 65 | static inline void _bcmtr_swq_tx_unlock(uint8_t device, long flags) |
| 66 | { |
| 67 | bcmos_fastlock_unlock(&tx_lock[device], flags); |
| 68 | } |
| 69 | |
| 70 | static inline long _bcmtr_swq_rx_lock(uint8_t device) |
| 71 | { |
| 72 | return bcmos_fastlock_lock(&rx_lock[device]); |
| 73 | } |
| 74 | |
| 75 | static inline void _bcmtr_swq_rx_unlock(uint8_t device, long flags) |
| 76 | { |
| 77 | bcmos_fastlock_unlock(&rx_lock[device], flags); |
| 78 | } |
| 79 | |
| 80 | /** Tx done callback. |
| 81 | * Must be called under tx_lock |
| 82 | */ |
| 83 | static void _bcmtr_swq_tx_done_cb(uint8_t device, bcmos_buf *buf) |
| 84 | { |
| 85 | BUG_ON(!hwq_occupancy[device]); |
| 86 | --hwq_occupancy[device]; |
| 87 | bcmos_buf_free(buf); |
| 88 | } |
| 89 | |
| 90 | /* Initialize PCI software queue module */ |
| 91 | bcmos_errno bcmtr_swq_init(void) |
| 92 | { |
| 93 | return bcmtr_pcie_tx_done_cblk_register(_bcmtr_swq_tx_done_cb); |
| 94 | } |
| 95 | |
| 96 | /* Cleanup software queue module |
| 97 | */ |
| 98 | void bcmtr_swq_exit(void) |
| 99 | { |
| 100 | int i; |
| 101 | |
| 102 | /* Unregister from bcmtr_pcie driver */ |
| 103 | bcmtr_pcie_tx_done_cblk_unregister(); |
| 104 | |
| 105 | for (i = 0; i < BCMTR_MAX_OLTS; i++) |
| 106 | bcmtr_swq_device_exit(i); |
| 107 | } |
| 108 | |
| 109 | /* Initialize PCI software queue module */ |
| 110 | bcmos_errno bcmtr_swq_device_init(uint8_t device) |
| 111 | { |
| 112 | bcmtr_pcie_prty prty; |
| 113 | |
| 114 | if (device >= BCMTR_MAX_OLTS) |
| 115 | return BCM_ERR_PARM; |
| 116 | |
| 117 | if (swq_initialized[device]) |
| 118 | return BCM_ERR_ALREADY; |
| 119 | |
| 120 | bcmos_fastlock_init(&tx_lock[device], 0); |
| 121 | bcmos_fastlock_init(&rx_lock[device], 0); |
| 122 | for (prty = 0; prty < BCMTR_PCIE_PRTY__NUM_OF; prty++) |
| 123 | { |
| 124 | pcie_swq *swq = &swq_info[device][prty]; |
| 125 | bcmos_buf_queue_init(&swq->txq); |
| 126 | bcmos_buf_queue_init(&swq->rxq); |
| 127 | swq->rx_cb = NULL; |
| 128 | swq->max_hwq_size = swq->max_swq_size = 0; |
| 129 | } |
| 130 | swq_initialized[device] = BCMOS_TRUE; |
| 131 | |
| 132 | return BCM_ERR_OK; |
| 133 | } |
| 134 | |
| 135 | /* Cleanup software queue module */ |
| 136 | void bcmtr_swq_device_exit(uint8_t device) |
| 137 | { |
| 138 | bcmtr_pcie_prty prty; |
| 139 | |
| 140 | if (!swq_initialized[device]) |
| 141 | return; |
| 142 | |
| 143 | for (prty = 0; prty < BCMTR_PCIE_PRTY__NUM_OF; prty++) |
| 144 | { |
| 145 | pcie_swq *swq = &swq_info[device][prty]; |
| 146 | bcmos_buf *buf; |
| 147 | |
| 148 | while ((buf=bcmos_buf_queue_get(&swq->txq))) |
| 149 | bcmos_buf_free(buf); |
| 150 | while ((buf=bcmos_buf_queue_get(&swq->rxq))) |
| 151 | bcmos_buf_free(buf); |
| 152 | } |
| 153 | swq_initialized[device] = BCMOS_FALSE; |
| 154 | |
| 155 | return; |
| 156 | } |
| 157 | |
| 158 | /** Send buffer to the peer |
| 159 | * \param[in] device Maple device index |
| 160 | * \param[in] channel Channel id (opaque to the bcmtr_pcie driver) |
| 161 | * \param[in] buf Buffer to be transferred |
| 162 | * \returns: 0 in case of success or error code < 0 |
| 163 | */ |
| 164 | bcmos_errno bcmtr_swq_send(uint8_t device, uint8_t channel, bcmos_buf *buf) |
| 165 | { |
| 166 | bcmtr_pcie_prty prty = (channel >= BCMTR_SWQ_FIRST_URGENT_CHANNEL) ? |
| 167 | BCMTR_PCIE_PRTY_URGENT : BCMTR_PCIE_PRTY_NORMAL; |
| 168 | pcie_swq *swq; |
| 169 | bcmos_bool was_empty; |
| 170 | bcmos_bool hw_queue_full; |
| 171 | bcmos_errno err; |
| 172 | long flags; |
| 173 | |
| 174 | BCMTR_SWQ_GET_RETURN_IF_ERROR(device, prty, swq); |
| 175 | |
| 176 | /* Store channel in the buffer */ |
| 177 | bcmos_buf_channel_set(buf, channel); |
| 178 | |
| 179 | /* Prevent concurrent access to the queue */ |
| 180 | flags = _bcmtr_swq_tx_lock(device); |
| 181 | |
| 182 | /* Store q-was-empty status */ |
| 183 | was_empty = bcmos_buf_queue_is_empty(&swq->txq); |
| 184 | |
| 185 | /* Check if max h/w queue occupancy isn't exceeded. If it isn't and s/w queue is empty |
| 186 | * submit directly to the h/w queue. |
| 187 | */ |
| 188 | hw_queue_full = (swq->max_hwq_size && hwq_occupancy[device] >= swq->max_hwq_size); |
| 189 | if (was_empty && !hw_queue_full) |
| 190 | { |
| 191 | ++hwq_occupancy[device]; |
| 192 | _bcmtr_swq_tx_unlock(device, flags); |
| 193 | err = bcmtr_pcie_send(device, channel, buf); |
| 194 | if (err) |
| 195 | { |
| 196 | flags = _bcmtr_swq_tx_lock(device); |
| 197 | --hwq_occupancy[device]; |
| 198 | /* If sw q is enabled, enque the buffer, otherwise, just return */ |
| 199 | if (swq->max_swq_size || swq->max_hwq_size) |
| 200 | { |
| 201 | bcmos_buf_queue_put(&swq->txq, buf); |
| 202 | err = BCM_ERR_OK; |
| 203 | } |
| 204 | _bcmtr_swq_tx_unlock(device, flags); |
| 205 | } |
| 206 | } |
| 207 | else |
| 208 | { |
| 209 | bcmos_buf_queue_put(&swq->txq, buf); |
| 210 | _bcmtr_swq_tx_unlock(device, flags); |
| 211 | err = BCM_ERR_OK; |
| 212 | } |
| 213 | |
| 214 | |
| 215 | return err; |
| 216 | } |
| 217 | |
| 218 | /** Receive packet from device |
| 219 | * \param[in] device Maple device index |
| 220 | * \param[in] prty Priority |
| 221 | * \param[out] channel message channel from the BD |
| 222 | * \param[out] buf pointer to network buffer containing the |
| 223 | * received packet |
| 224 | * \returns: 0 in case of success or error code < 0 |
| 225 | */ |
| 226 | bcmos_errno bcmtr_swq_receive(uint8_t device, bcmtr_pcie_prty prty, uint8_t *channel, bcmos_buf **buf) |
| 227 | { |
| 228 | pcie_swq *swq; |
| 229 | long flags; |
| 230 | bcmos_errno err; |
| 231 | |
| 232 | BCMTR_SWQ_GET_RETURN_IF_ERROR(device, prty, swq); |
| 233 | |
| 234 | /* Peevent concurent access to the queue */ |
| 235 | flags = _bcmtr_swq_rx_lock(device); |
| 236 | *buf = bcmos_buf_queue_get(&swq->rxq); |
| 237 | if (*buf) |
| 238 | { |
| 239 | *channel = bcmos_buf_channel(*buf); |
| 240 | err = BCM_ERR_OK; |
| 241 | } |
| 242 | else |
| 243 | { |
| 244 | err = BCM_ERR_QUEUE_EMPTY; |
| 245 | } |
| 246 | _bcmtr_swq_rx_unlock(device, flags); |
| 247 | |
| 248 | return err; |
| 249 | } |
| 250 | |
| 251 | /** Configure TX queue. |
| 252 | */ |
| 253 | bcmos_errno bcmtr_swq_tx_queue_cfg(uint8_t device, bcmtr_pcie_prty prty, uint32_t hardq_size, uint32_t softq_size) |
| 254 | { |
| 255 | pcie_swq *swq; |
| 256 | |
| 257 | BCMTR_SWQ_GET_RETURN_IF_ERROR(device, prty, swq); |
| 258 | |
| 259 | swq->max_hwq_size = hardq_size; |
| 260 | swq->max_swq_size = softq_size; |
| 261 | |
| 262 | return BCM_ERR_OK; |
| 263 | } |
| 264 | |
| 265 | /** Register for "data received indication" |
| 266 | * \param[in] device Maple device index |
| 267 | * \param[in] prty Priority |
| 268 | * \param[in] cb Callback pointer |
| 269 | * \returns: 0 in case of success or error code < 0 |
| 270 | */ |
| 271 | bcmos_errno bcmtr_swq_rx_cb_register(uint8_t device, bcmtr_pcie_prty prty, bcmtr_swq_rx_cb rx_cb) |
| 272 | { |
| 273 | if (device >= BCMTR_MAX_OLTS) |
| 274 | return BCM_ERR_PARM; |
| 275 | swq_info[device][prty].rx_cb = rx_cb; |
| 276 | |
| 277 | return BCM_ERR_OK; |
| 278 | } |
| 279 | |
| 280 | /** Unregister "data received indication" callback |
| 281 | * \param[in] device Maple device index |
| 282 | * \param[in] prty Priority |
| 283 | * \returns: 0 in case of success or error code < 0 |
| 284 | */ |
| 285 | bcmos_errno bcmtr_swq_rx_cb_unregister(uint8_t device, bcmtr_pcie_prty prty) |
| 286 | { |
| 287 | if (device >= BCMTR_MAX_OLTS) |
| 288 | return BCM_ERR_PARM; |
| 289 | swq_info[device][prty].rx_cb = NULL; |
| 290 | |
| 291 | return BCM_ERR_OK; |
| 292 | } |
| 293 | |
| 294 | /* Fetch data from the hw to the sw queue. */ |
| 295 | void bcmtr_swq_rx_poll(uint8_t device, uint32_t nbuf[]) |
| 296 | { |
| 297 | uint8_t channel; |
| 298 | bcmos_buf *buf; |
| 299 | int n[BCMTR_PCIE_PRTY__NUM_OF] = {}; |
| 300 | long flags; |
| 301 | bcmos_errno err; |
| 302 | |
| 303 | do |
| 304 | { |
| 305 | bcmtr_pcie_prty prty; |
| 306 | pcie_swq *swq; |
| 307 | |
| 308 | err = bcmtr_pcie_receive(device, &channel, &buf); |
| 309 | if (err != BCM_ERR_OK) |
| 310 | break; |
| 311 | prty = (channel >= BCMTR_SWQ_FIRST_URGENT_CHANNEL) ? |
| 312 | BCMTR_PCIE_PRTY_URGENT : BCMTR_PCIE_PRTY_NORMAL; |
| 313 | /* If callback based delivery - deliver buffer now, otherwise, place on s/w queue */ |
| 314 | swq = &swq_info[device][prty]; |
| 315 | if (swq->rx_cb) |
| 316 | { |
| 317 | swq->rx_cb(device, channel, buf); |
| 318 | } |
| 319 | else |
| 320 | { |
| 321 | bcmos_buf_channel_set(buf, channel); |
| 322 | flags = _bcmtr_swq_rx_lock(device); |
| 323 | bcmos_buf_queue_put(&swq->rxq, buf); |
| 324 | _bcmtr_swq_rx_unlock(device, flags); |
| 325 | } |
| 326 | ++n[prty]; |
| 327 | } while (BCMOS_TRUE); |
| 328 | |
| 329 | |
| 330 | nbuf[0] = n[0]; |
| 331 | nbuf[1] = n[1]; |
| 332 | } |
| 333 | |
| 334 | /* Submit data from the sw TX queue to the h/w */ |
| 335 | static void _bcmtr_swq_tx_submit_prty(uint8_t device, bcmtr_pcie_prty prty) |
| 336 | { |
| 337 | bcmos_errno err = BCM_ERR_OK; |
| 338 | pcie_swq *swq; |
| 339 | bcmos_buf *buf; |
| 340 | uint8_t channel; |
| 341 | bcmos_bool hw_queue_full; |
| 342 | long flags; |
| 343 | |
| 344 | swq = &swq_info[device][prty]; |
| 345 | do |
| 346 | { |
| 347 | flags = _bcmtr_swq_tx_lock(device); |
| 348 | |
| 349 | /* Check if not over limit */ |
| 350 | hw_queue_full = (swq->max_hwq_size && hwq_occupancy[device] >= swq->max_hwq_size); |
| 351 | if (hw_queue_full) |
| 352 | { |
| 353 | _bcmtr_swq_tx_unlock(device, flags); |
| 354 | break; |
| 355 | } |
| 356 | |
| 357 | /* Get from s/w queue and submit to the h/w queue */ |
| 358 | buf = bcmos_buf_queue_peek(&swq->rxq); |
| 359 | _bcmtr_swq_tx_unlock(device, flags); |
| 360 | if (!buf) |
| 361 | break; |
| 362 | |
| 363 | channel = bcmos_buf_channel(buf); |
| 364 | err = bcmtr_pcie_send(device, channel, buf); |
| 365 | if (err != BCM_ERR_OK) |
| 366 | break; |
| 367 | |
| 368 | flags = _bcmtr_swq_tx_lock(device); |
| 369 | ++hwq_occupancy[device]; |
| 370 | bcmos_buf_queue_get(&swq->txq); |
| 371 | _bcmtr_swq_tx_unlock(device, flags); |
| 372 | |
| 373 | } while (BCMOS_TRUE); |
| 374 | } |
| 375 | |
| 376 | /* Submit data from the sw TX queue to the h/w */ |
| 377 | void bcmtr_swq_tx_submit(uint8_t device) |
| 378 | { |
| 379 | if (bcmtr_pcie_tx_collect(device) > 0) |
| 380 | { |
| 381 | _bcmtr_swq_tx_submit_prty(device, BCMTR_PCIE_PRTY_URGENT); |
| 382 | _bcmtr_swq_tx_submit_prty(device, BCMTR_PCIE_PRTY_NORMAL); |
| 383 | } |
| 384 | } |
| 385 | |
| 386 | #ifdef __KERNEL__ |
| 387 | EXPORT_SYMBOL(bcmtr_swq_tx_queue_cfg); |
| 388 | EXPORT_SYMBOL(bcmtr_swq_send); |
| 389 | #endif |