1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2020-21 Intel Corporation. 4 */ 5 6 #include "iosm_ipc_mux_codec.h" 7 8 /* At the begin of the runtime phase the IP MUX channel shall created. */ 9 static int ipc_mux_channel_create(struct iosm_mux *ipc_mux) 10 { 11 int channel_id; 12 13 channel_id = ipc_imem_channel_alloc(ipc_mux->imem, ipc_mux->instance_id, 14 IPC_CTYPE_WWAN); 15 16 if (channel_id < 0) { 17 dev_err(ipc_mux->dev, 18 "allocation of the MUX channel id failed"); 19 ipc_mux->state = MUX_S_ERROR; 20 ipc_mux->event = MUX_E_NOT_APPLICABLE; 21 goto no_channel; 22 } 23 24 /* Establish the MUX channel in blocking mode. */ 25 ipc_mux->channel = ipc_imem_channel_open(ipc_mux->imem, channel_id, 26 IPC_HP_NET_CHANNEL_INIT); 27 28 if (!ipc_mux->channel) { 29 dev_err(ipc_mux->dev, "ipc_imem_channel_open failed"); 30 ipc_mux->state = MUX_S_ERROR; 31 ipc_mux->event = MUX_E_NOT_APPLICABLE; 32 return -ENODEV; /* MUX channel is not available. */ 33 } 34 35 /* Define the MUX active state properties. */ 36 ipc_mux->state = MUX_S_ACTIVE; 37 ipc_mux->event = MUX_E_NO_ORDERS; 38 39 no_channel: 40 return channel_id; 41 } 42 43 /* Reset the session/if id state. */ 44 static void ipc_mux_session_free(struct iosm_mux *ipc_mux, int if_id) 45 { 46 struct mux_session *if_entry; 47 48 if_entry = &ipc_mux->session[if_id]; 49 /* Reset the session state. */ 50 if_entry->wwan = NULL; 51 } 52 53 /* Create and send the session open command. */ 54 static struct mux_cmd_open_session_resp * 55 ipc_mux_session_open_send(struct iosm_mux *ipc_mux, int if_id) 56 { 57 struct mux_cmd_open_session_resp *open_session_resp; 58 struct mux_acb *acb = &ipc_mux->acb; 59 union mux_cmd_param param; 60 61 /* open_session commands to one ACB and start transmission. */ 62 param.open_session.flow_ctrl = 0; 63 param.open_session.ipv4v6_hints = 0; 64 param.open_session.reserved2 = 0; 65 param.open_session.dl_head_pad_len = cpu_to_le32(IPC_MEM_DL_ETH_OFFSET); 66 67 /* Finish and transfer ACB. The user thread is suspended. 68 * It is a blocking function call, until CP responds or timeout. 69 */ 70 acb->wanted_response = MUX_CMD_OPEN_SESSION_RESP; 71 if (ipc_mux_dl_acb_send_cmds(ipc_mux, MUX_CMD_OPEN_SESSION, if_id, 0, 72 ¶m, sizeof(param.open_session), true, 73 false) || 74 acb->got_response != MUX_CMD_OPEN_SESSION_RESP) { 75 dev_err(ipc_mux->dev, "if_id %d: OPEN_SESSION send failed", 76 if_id); 77 return NULL; 78 } 79 80 open_session_resp = &ipc_mux->acb.got_param.open_session_resp; 81 if (open_session_resp->response != cpu_to_le32(MUX_CMD_RESP_SUCCESS)) { 82 dev_err(ipc_mux->dev, 83 "if_id %d,session open failed,response=%d", if_id, 84 open_session_resp->response); 85 return NULL; 86 } 87 88 return open_session_resp; 89 } 90 91 /* Open the first IP session. */ 92 static bool ipc_mux_session_open(struct iosm_mux *ipc_mux, 93 struct mux_session_open *session_open) 94 { 95 struct mux_cmd_open_session_resp *open_session_resp; 96 int if_id; 97 98 /* Search for a free session interface id. */ 99 if_id = le32_to_cpu(session_open->if_id); 100 if (if_id < 0 || if_id >= IPC_MEM_MUX_IP_SESSION_ENTRIES) { 101 dev_err(ipc_mux->dev, "invalid interface id=%d", if_id); 102 return false; 103 } 104 105 /* Create and send the session open command. 106 * It is a blocking function call, until CP responds or timeout. 107 */ 108 open_session_resp = ipc_mux_session_open_send(ipc_mux, if_id); 109 if (!open_session_resp) { 110 ipc_mux_session_free(ipc_mux, if_id); 111 session_open->if_id = cpu_to_le32(-1); 112 return false; 113 } 114 115 /* Initialize the uplink skb accumulator. */ 116 skb_queue_head_init(&ipc_mux->session[if_id].ul_list); 117 118 ipc_mux->session[if_id].dl_head_pad_len = IPC_MEM_DL_ETH_OFFSET; 119 ipc_mux->session[if_id].ul_head_pad_len = 120 le32_to_cpu(open_session_resp->ul_head_pad_len); 121 ipc_mux->session[if_id].wwan = ipc_mux->wwan; 122 123 /* Reset the flow ctrl stats of the session */ 124 ipc_mux->session[if_id].flow_ctl_en_cnt = 0; 125 ipc_mux->session[if_id].flow_ctl_dis_cnt = 0; 126 ipc_mux->session[if_id].ul_flow_credits = 0; 127 ipc_mux->session[if_id].net_tx_stop = false; 128 ipc_mux->session[if_id].flow_ctl_mask = 0; 129 130 /* Save and return the assigned if id. */ 131 session_open->if_id = cpu_to_le32(if_id); 132 ipc_mux->nr_sessions++; 133 134 return true; 135 } 136 137 /* Free pending session UL packet. */ 138 static void ipc_mux_session_reset(struct iosm_mux *ipc_mux, int if_id) 139 { 140 /* Reset the session/if id state. */ 141 ipc_mux_session_free(ipc_mux, if_id); 142 143 /* Empty the uplink skb accumulator. */ 144 skb_queue_purge(&ipc_mux->session[if_id].ul_list); 145 } 146 147 static void ipc_mux_session_close(struct iosm_mux *ipc_mux, 148 struct mux_session_close *msg) 149 { 150 int if_id; 151 152 /* Copy the session interface id. */ 153 if_id = le32_to_cpu(msg->if_id); 154 155 if (if_id < 0 || if_id >= IPC_MEM_MUX_IP_SESSION_ENTRIES) { 156 dev_err(ipc_mux->dev, "invalid session id %d", if_id); 157 return; 158 } 159 160 /* Create and send the session close command. 161 * It is a blocking function call, until CP responds or timeout. 162 */ 163 if (ipc_mux_dl_acb_send_cmds(ipc_mux, MUX_CMD_CLOSE_SESSION, if_id, 0, 164 NULL, 0, true, false)) 165 dev_err(ipc_mux->dev, "if_id %d: CLOSE_SESSION send failed", 166 if_id); 167 168 /* Reset the flow ctrl stats of the session */ 169 ipc_mux->session[if_id].flow_ctl_en_cnt = 0; 170 ipc_mux->session[if_id].flow_ctl_dis_cnt = 0; 171 ipc_mux->session[if_id].flow_ctl_mask = 0; 172 173 ipc_mux_session_reset(ipc_mux, if_id); 174 ipc_mux->nr_sessions--; 175 } 176 177 static void ipc_mux_channel_close(struct iosm_mux *ipc_mux, 178 struct mux_channel_close *channel_close_p) 179 { 180 int i; 181 182 /* Free pending session UL packet. */ 183 for (i = 0; i < IPC_MEM_MUX_IP_SESSION_ENTRIES; i++) 184 if (ipc_mux->session[i].wwan) 185 ipc_mux_session_reset(ipc_mux, i); 186 187 ipc_imem_channel_close(ipc_mux->imem, ipc_mux->channel_id); 188 189 /* Reset the MUX object. */ 190 ipc_mux->state = MUX_S_INACTIVE; 191 ipc_mux->event = MUX_E_INACTIVE; 192 } 193 194 /* CP has interrupted AP. If AP is in IP MUX mode, execute the pending ops. */ 195 static int ipc_mux_schedule(struct iosm_mux *ipc_mux, union mux_msg *msg) 196 { 197 enum mux_event order; 198 bool success; 199 int ret = -EIO; 200 201 if (!ipc_mux->initialized) { 202 ret = -EAGAIN; 203 goto out; 204 } 205 206 order = msg->common.event; 207 208 switch (ipc_mux->state) { 209 case MUX_S_INACTIVE: 210 if (order != MUX_E_MUX_SESSION_OPEN) 211 goto out; /* Wait for the request to open a session */ 212 213 if (ipc_mux->event == MUX_E_INACTIVE) 214 /* Establish the MUX channel and the new state. */ 215 ipc_mux->channel_id = ipc_mux_channel_create(ipc_mux); 216 217 if (ipc_mux->state != MUX_S_ACTIVE) { 218 ret = ipc_mux->channel_id; /* Missing the MUX channel */ 219 goto out; 220 } 221 222 /* Disable the TD update timer and open the first IP session. */ 223 ipc_imem_td_update_timer_suspend(ipc_mux->imem, true); 224 ipc_mux->event = MUX_E_MUX_SESSION_OPEN; 225 success = ipc_mux_session_open(ipc_mux, &msg->session_open); 226 227 ipc_imem_td_update_timer_suspend(ipc_mux->imem, false); 228 if (success) 229 ret = ipc_mux->channel_id; 230 goto out; 231 232 case MUX_S_ACTIVE: 233 switch (order) { 234 case MUX_E_MUX_SESSION_OPEN: 235 /* Disable the TD update timer and open a session */ 236 ipc_imem_td_update_timer_suspend(ipc_mux->imem, true); 237 ipc_mux->event = MUX_E_MUX_SESSION_OPEN; 238 success = ipc_mux_session_open(ipc_mux, 239 &msg->session_open); 240 ipc_imem_td_update_timer_suspend(ipc_mux->imem, false); 241 if (success) 242 ret = ipc_mux->channel_id; 243 goto out; 244 245 case MUX_E_MUX_SESSION_CLOSE: 246 /* Release an IP session. */ 247 ipc_mux->event = MUX_E_MUX_SESSION_CLOSE; 248 ipc_mux_session_close(ipc_mux, &msg->session_close); 249 if (!ipc_mux->nr_sessions) { 250 ipc_mux->event = MUX_E_MUX_CHANNEL_CLOSE; 251 ipc_mux_channel_close(ipc_mux, 252 &msg->channel_close); 253 } 254 ret = ipc_mux->channel_id; 255 goto out; 256 257 case MUX_E_MUX_CHANNEL_CLOSE: 258 /* Close the MUX channel pipes. */ 259 ipc_mux->event = MUX_E_MUX_CHANNEL_CLOSE; 260 ipc_mux_channel_close(ipc_mux, &msg->channel_close); 261 ret = ipc_mux->channel_id; 262 goto out; 263 264 default: 265 /* Invalid order. */ 266 goto out; 267 } 268 269 default: 270 dev_err(ipc_mux->dev, 271 "unexpected MUX transition: state=%d, event=%d", 272 ipc_mux->state, ipc_mux->event); 273 } 274 out: 275 return ret; 276 } 277 278 struct iosm_mux *ipc_mux_init(struct ipc_mux_config *mux_cfg, 279 struct iosm_imem *imem) 280 { 281 struct iosm_mux *ipc_mux = kzalloc(sizeof(*ipc_mux), GFP_KERNEL); 282 int i, ul_tds, ul_td_size; 283 struct sk_buff_head *free_list; 284 struct sk_buff *skb; 285 286 if (!ipc_mux) 287 return NULL; 288 289 ipc_mux->protocol = mux_cfg->protocol; 290 ipc_mux->ul_flow = mux_cfg->ul_flow; 291 ipc_mux->instance_id = mux_cfg->instance_id; 292 ipc_mux->wwan_q_offset = 0; 293 294 ipc_mux->pcie = imem->pcie; 295 ipc_mux->imem = imem; 296 ipc_mux->ipc_protocol = imem->ipc_protocol; 297 ipc_mux->dev = imem->dev; 298 ipc_mux->wwan = imem->wwan; 299 300 /* Get the reference to the UL ADB list. */ 301 free_list = &ipc_mux->ul_adb.free_list; 302 303 /* Initialize the list with free ADB. */ 304 skb_queue_head_init(free_list); 305 306 ul_td_size = IPC_MEM_MAX_DL_MUX_LITE_BUF_SIZE; 307 308 ul_tds = IPC_MEM_MAX_TDS_MUX_LITE_UL; 309 310 ipc_mux->ul_adb.dest_skb = NULL; 311 312 ipc_mux->initialized = true; 313 ipc_mux->adb_prep_ongoing = false; 314 ipc_mux->size_needed = 0; 315 ipc_mux->ul_data_pend_bytes = 0; 316 ipc_mux->state = MUX_S_INACTIVE; 317 ipc_mux->ev_mux_net_transmit_pending = false; 318 ipc_mux->tx_transaction_id = 0; 319 ipc_mux->rr_next_session = 0; 320 ipc_mux->event = MUX_E_INACTIVE; 321 ipc_mux->channel_id = -1; 322 ipc_mux->channel = NULL; 323 324 /* Allocate the list of UL ADB. */ 325 for (i = 0; i < ul_tds; i++) { 326 dma_addr_t mapping; 327 328 skb = ipc_pcie_alloc_skb(ipc_mux->pcie, ul_td_size, GFP_ATOMIC, 329 &mapping, DMA_TO_DEVICE, 0); 330 if (!skb) { 331 ipc_mux_deinit(ipc_mux); 332 return NULL; 333 } 334 /* Extend the UL ADB list. */ 335 skb_queue_tail(free_list, skb); 336 } 337 338 return ipc_mux; 339 } 340 341 /* Informs the network stack to restart transmission for all opened session if 342 * Flow Control is not ON for that session. 343 */ 344 static void ipc_mux_restart_tx_for_all_sessions(struct iosm_mux *ipc_mux) 345 { 346 struct mux_session *session; 347 int idx; 348 349 for (idx = 0; idx < IPC_MEM_MUX_IP_SESSION_ENTRIES; idx++) { 350 session = &ipc_mux->session[idx]; 351 352 if (!session->wwan) 353 continue; 354 355 /* If flow control of the session is OFF and if there was tx 356 * stop then restart. Inform the network interface to restart 357 * sending data. 358 */ 359 if (session->flow_ctl_mask == 0) { 360 session->net_tx_stop = false; 361 ipc_mux_netif_tx_flowctrl(session, idx, false); 362 } 363 } 364 } 365 366 /* Informs the network stack to stop sending further pkt for all opened 367 * sessions 368 */ 369 static void ipc_mux_stop_netif_for_all_sessions(struct iosm_mux *ipc_mux) 370 { 371 struct mux_session *session; 372 int idx; 373 374 for (idx = 0; idx < IPC_MEM_MUX_IP_SESSION_ENTRIES; idx++) { 375 session = &ipc_mux->session[idx]; 376 377 if (!session->wwan) 378 continue; 379 380 ipc_mux_netif_tx_flowctrl(session, session->if_id, true); 381 } 382 } 383 384 void ipc_mux_check_n_restart_tx(struct iosm_mux *ipc_mux) 385 { 386 if (ipc_mux->ul_flow == MUX_UL) { 387 int low_thresh = IPC_MEM_MUX_UL_FLOWCTRL_LOW_B; 388 389 if (ipc_mux->ul_data_pend_bytes < low_thresh) 390 ipc_mux_restart_tx_for_all_sessions(ipc_mux); 391 } 392 } 393 394 int ipc_mux_get_max_sessions(struct iosm_mux *ipc_mux) 395 { 396 return ipc_mux ? IPC_MEM_MUX_IP_SESSION_ENTRIES : -EFAULT; 397 } 398 399 enum ipc_mux_protocol ipc_mux_get_active_protocol(struct iosm_mux *ipc_mux) 400 { 401 return ipc_mux ? ipc_mux->protocol : MUX_UNKNOWN; 402 } 403 404 int ipc_mux_open_session(struct iosm_mux *ipc_mux, int session_nr) 405 { 406 struct mux_session_open *session_open; 407 union mux_msg mux_msg; 408 409 session_open = &mux_msg.session_open; 410 session_open->event = MUX_E_MUX_SESSION_OPEN; 411 412 session_open->if_id = cpu_to_le32(session_nr); 413 ipc_mux->session[session_nr].flags |= IPC_MEM_WWAN_MUX; 414 return ipc_mux_schedule(ipc_mux, &mux_msg); 415 } 416 417 int ipc_mux_close_session(struct iosm_mux *ipc_mux, int session_nr) 418 { 419 struct mux_session_close *session_close; 420 union mux_msg mux_msg; 421 int ret_val; 422 423 session_close = &mux_msg.session_close; 424 session_close->event = MUX_E_MUX_SESSION_CLOSE; 425 426 session_close->if_id = cpu_to_le32(session_nr); 427 ret_val = ipc_mux_schedule(ipc_mux, &mux_msg); 428 ipc_mux->session[session_nr].flags &= ~IPC_MEM_WWAN_MUX; 429 430 return ret_val; 431 } 432 433 void ipc_mux_deinit(struct iosm_mux *ipc_mux) 434 { 435 struct mux_channel_close *channel_close; 436 struct sk_buff_head *free_list; 437 union mux_msg mux_msg; 438 struct sk_buff *skb; 439 440 if (!ipc_mux->initialized) 441 return; 442 ipc_mux_stop_netif_for_all_sessions(ipc_mux); 443 444 if (ipc_mux->state == MUX_S_ACTIVE) { 445 channel_close = &mux_msg.channel_close; 446 channel_close->event = MUX_E_MUX_CHANNEL_CLOSE; 447 ipc_mux_schedule(ipc_mux, &mux_msg); 448 } 449 450 /* Empty the ADB free list. */ 451 free_list = &ipc_mux->ul_adb.free_list; 452 453 /* Remove from the head of the downlink queue. */ 454 while ((skb = skb_dequeue(free_list))) 455 ipc_pcie_kfree_skb(ipc_mux->pcie, skb); 456 457 if (ipc_mux->channel) { 458 ipc_mux->channel->ul_pipe.is_open = false; 459 ipc_mux->channel->dl_pipe.is_open = false; 460 } 461 462 kfree(ipc_mux); 463 } 464