1 /* 2 * Copyright (C) 2015 Cavium, Inc. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of version 2 of the GNU General Public License 6 * as published by the Free Software Foundation. 7 */ 8 9 #include <linux/module.h> 10 #include <linux/interrupt.h> 11 #include <linux/pci.h> 12 #include <linux/etherdevice.h> 13 #include <linux/of.h> 14 15 #include "nic_reg.h" 16 #include "nic.h" 17 #include "q_struct.h" 18 #include "thunder_bgx.h" 19 20 #define DRV_NAME "thunder-nic" 21 #define DRV_VERSION "1.0" 22 23 struct nicpf { 24 struct pci_dev *pdev; 25 u8 node; 26 unsigned int flags; 27 u8 num_vf_en; /* No of VF enabled */ 28 bool vf_enabled[MAX_NUM_VFS_SUPPORTED]; 29 void __iomem *reg_base; /* Register start address */ 30 u8 num_sqs_en; /* Secondary qsets enabled */ 31 u64 nicvf[MAX_NUM_VFS_SUPPORTED]; 32 u8 vf_sqs[MAX_NUM_VFS_SUPPORTED][MAX_SQS_PER_VF]; 33 u8 pqs_vf[MAX_NUM_VFS_SUPPORTED]; 34 bool sqs_used[MAX_NUM_VFS_SUPPORTED]; 35 struct pkind_cfg pkind; 36 #define NIC_SET_VF_LMAC_MAP(bgx, lmac) (((bgx & 0xF) << 4) | (lmac & 0xF)) 37 #define NIC_GET_BGX_FROM_VF_LMAC_MAP(map) ((map >> 4) & 0xF) 38 #define NIC_GET_LMAC_FROM_VF_LMAC_MAP(map) (map & 0xF) 39 u8 vf_lmac_map[MAX_LMAC]; 40 struct delayed_work dwork; 41 struct workqueue_struct *check_link; 42 u8 link[MAX_LMAC]; 43 u8 duplex[MAX_LMAC]; 44 u32 speed[MAX_LMAC]; 45 u16 cpi_base[MAX_NUM_VFS_SUPPORTED]; 46 u16 rssi_base[MAX_NUM_VFS_SUPPORTED]; 47 u16 rss_ind_tbl_size; 48 bool mbx_lock[MAX_NUM_VFS_SUPPORTED]; 49 50 /* MSI-X */ 51 bool msix_enabled; 52 u8 num_vec; 53 struct msix_entry msix_entries[NIC_PF_MSIX_VECTORS]; 54 bool irq_allocated[NIC_PF_MSIX_VECTORS]; 55 }; 56 57 static inline bool pass1_silicon(struct nicpf *nic) 58 { 59 return nic->pdev->revision < 8; 60 } 61 62 /* Supported devices */ 63 static const struct pci_device_id nic_id_table[] = { 64 { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, PCI_DEVICE_ID_THUNDER_NIC_PF) }, 65 { 0, } /* end of table */ 66 }; 67 68 MODULE_AUTHOR("Sunil Goutham"); 69 MODULE_DESCRIPTION("Cavium Thunder NIC Physical Function Driver"); 70 MODULE_LICENSE("GPL v2"); 71 MODULE_VERSION(DRV_VERSION); 72 MODULE_DEVICE_TABLE(pci, nic_id_table); 73 74 /* The Cavium ThunderX network controller can *only* be found in SoCs 75 * containing the ThunderX ARM64 CPU implementation. All accesses to the device 76 * registers on this platform are implicitly strongly ordered with respect 77 * to memory accesses. So writeq_relaxed() and readq_relaxed() are safe to use 78 * with no memory barriers in this driver. The readq()/writeq() functions add 79 * explicit ordering operation which in this case are redundant, and only 80 * add overhead. 81 */ 82 83 /* Register read/write APIs */ 84 static void nic_reg_write(struct nicpf *nic, u64 offset, u64 val) 85 { 86 writeq_relaxed(val, nic->reg_base + offset); 87 } 88 89 static u64 nic_reg_read(struct nicpf *nic, u64 offset) 90 { 91 return readq_relaxed(nic->reg_base + offset); 92 } 93 94 /* PF -> VF mailbox communication APIs */ 95 static void nic_enable_mbx_intr(struct nicpf *nic) 96 { 97 /* Enable mailbox interrupt for all 128 VFs */ 98 nic_reg_write(nic, NIC_PF_MAILBOX_ENA_W1S, ~0ull); 99 nic_reg_write(nic, NIC_PF_MAILBOX_ENA_W1S + sizeof(u64), ~0ull); 100 } 101 102 static void nic_clear_mbx_intr(struct nicpf *nic, int vf, int mbx_reg) 103 { 104 nic_reg_write(nic, NIC_PF_MAILBOX_INT + (mbx_reg << 3), BIT_ULL(vf)); 105 } 106 107 static u64 nic_get_mbx_addr(int vf) 108 { 109 return NIC_PF_VF_0_127_MAILBOX_0_1 + (vf << NIC_VF_NUM_SHIFT); 110 } 111 112 /* Send a mailbox message to VF 113 * @vf: vf to which this message to be sent 114 * @mbx: Message to be sent 115 */ 116 static void nic_send_msg_to_vf(struct nicpf *nic, int vf, union nic_mbx *mbx) 117 { 118 void __iomem *mbx_addr = nic->reg_base + nic_get_mbx_addr(vf); 119 u64 *msg = (u64 *)mbx; 120 121 /* In first revision HW, mbox interrupt is triggerred 122 * when PF writes to MBOX(1), in next revisions when 123 * PF writes to MBOX(0) 124 */ 125 if (pass1_silicon(nic)) { 126 /* see the comment for nic_reg_write()/nic_reg_read() 127 * functions above 128 */ 129 writeq_relaxed(msg[0], mbx_addr); 130 writeq_relaxed(msg[1], mbx_addr + 8); 131 } else { 132 writeq_relaxed(msg[1], mbx_addr + 8); 133 writeq_relaxed(msg[0], mbx_addr); 134 } 135 } 136 137 /* Responds to VF's READY message with VF's 138 * ID, node, MAC address e.t.c 139 * @vf: VF which sent READY message 140 */ 141 static void nic_mbx_send_ready(struct nicpf *nic, int vf) 142 { 143 union nic_mbx mbx = {}; 144 int bgx_idx, lmac; 145 const char *mac; 146 147 mbx.nic_cfg.msg = NIC_MBOX_MSG_READY; 148 mbx.nic_cfg.vf_id = vf; 149 150 mbx.nic_cfg.tns_mode = NIC_TNS_BYPASS_MODE; 151 152 if (vf < MAX_LMAC) { 153 bgx_idx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vf]); 154 lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vf]); 155 156 mac = bgx_get_lmac_mac(nic->node, bgx_idx, lmac); 157 if (mac) 158 ether_addr_copy((u8 *)&mbx.nic_cfg.mac_addr, mac); 159 } 160 mbx.nic_cfg.sqs_mode = (vf >= nic->num_vf_en) ? true : false; 161 mbx.nic_cfg.node_id = nic->node; 162 163 mbx.nic_cfg.loopback_supported = vf < MAX_LMAC; 164 165 nic_send_msg_to_vf(nic, vf, &mbx); 166 } 167 168 /* ACKs VF's mailbox message 169 * @vf: VF to which ACK to be sent 170 */ 171 static void nic_mbx_send_ack(struct nicpf *nic, int vf) 172 { 173 union nic_mbx mbx = {}; 174 175 mbx.msg.msg = NIC_MBOX_MSG_ACK; 176 nic_send_msg_to_vf(nic, vf, &mbx); 177 } 178 179 /* NACKs VF's mailbox message that PF is not able to 180 * complete the action 181 * @vf: VF to which ACK to be sent 182 */ 183 static void nic_mbx_send_nack(struct nicpf *nic, int vf) 184 { 185 union nic_mbx mbx = {}; 186 187 mbx.msg.msg = NIC_MBOX_MSG_NACK; 188 nic_send_msg_to_vf(nic, vf, &mbx); 189 } 190 191 /* Flush all in flight receive packets to memory and 192 * bring down an active RQ 193 */ 194 static int nic_rcv_queue_sw_sync(struct nicpf *nic) 195 { 196 u16 timeout = ~0x00; 197 198 nic_reg_write(nic, NIC_PF_SW_SYNC_RX, 0x01); 199 /* Wait till sync cycle is finished */ 200 while (timeout) { 201 if (nic_reg_read(nic, NIC_PF_SW_SYNC_RX_DONE) & 0x1) 202 break; 203 timeout--; 204 } 205 nic_reg_write(nic, NIC_PF_SW_SYNC_RX, 0x00); 206 if (!timeout) { 207 dev_err(&nic->pdev->dev, "Receive queue software sync failed"); 208 return 1; 209 } 210 return 0; 211 } 212 213 /* Get BGX Rx/Tx stats and respond to VF's request */ 214 static void nic_get_bgx_stats(struct nicpf *nic, struct bgx_stats_msg *bgx) 215 { 216 int bgx_idx, lmac; 217 union nic_mbx mbx = {}; 218 219 bgx_idx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[bgx->vf_id]); 220 lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[bgx->vf_id]); 221 222 mbx.bgx_stats.msg = NIC_MBOX_MSG_BGX_STATS; 223 mbx.bgx_stats.vf_id = bgx->vf_id; 224 mbx.bgx_stats.rx = bgx->rx; 225 mbx.bgx_stats.idx = bgx->idx; 226 if (bgx->rx) 227 mbx.bgx_stats.stats = bgx_get_rx_stats(nic->node, bgx_idx, 228 lmac, bgx->idx); 229 else 230 mbx.bgx_stats.stats = bgx_get_tx_stats(nic->node, bgx_idx, 231 lmac, bgx->idx); 232 nic_send_msg_to_vf(nic, bgx->vf_id, &mbx); 233 } 234 235 /* Update hardware min/max frame size */ 236 static int nic_update_hw_frs(struct nicpf *nic, int new_frs, int vf) 237 { 238 if ((new_frs > NIC_HW_MAX_FRS) || (new_frs < NIC_HW_MIN_FRS)) { 239 dev_err(&nic->pdev->dev, 240 "Invalid MTU setting from VF%d rejected, should be between %d and %d\n", 241 vf, NIC_HW_MIN_FRS, NIC_HW_MAX_FRS); 242 return 1; 243 } 244 new_frs += ETH_HLEN; 245 if (new_frs <= nic->pkind.maxlen) 246 return 0; 247 248 nic->pkind.maxlen = new_frs; 249 nic_reg_write(nic, NIC_PF_PKIND_0_15_CFG, *(u64 *)&nic->pkind); 250 return 0; 251 } 252 253 /* Set minimum transmit packet size */ 254 static void nic_set_tx_pkt_pad(struct nicpf *nic, int size) 255 { 256 int lmac; 257 u64 lmac_cfg; 258 259 /* Max value that can be set is 60 */ 260 if (size > 60) 261 size = 60; 262 263 for (lmac = 0; lmac < (MAX_BGX_PER_CN88XX * MAX_LMAC_PER_BGX); lmac++) { 264 lmac_cfg = nic_reg_read(nic, NIC_PF_LMAC_0_7_CFG | (lmac << 3)); 265 lmac_cfg &= ~(0xF << 2); 266 lmac_cfg |= ((size / 4) << 2); 267 nic_reg_write(nic, NIC_PF_LMAC_0_7_CFG | (lmac << 3), lmac_cfg); 268 } 269 } 270 271 /* Function to check number of LMACs present and set VF::LMAC mapping. 272 * Mapping will be used while initializing channels. 273 */ 274 static void nic_set_lmac_vf_mapping(struct nicpf *nic) 275 { 276 unsigned bgx_map = bgx_get_map(nic->node); 277 int bgx, next_bgx_lmac = 0; 278 int lmac, lmac_cnt = 0; 279 u64 lmac_credit; 280 281 nic->num_vf_en = 0; 282 283 for (bgx = 0; bgx < NIC_MAX_BGX; bgx++) { 284 if (!(bgx_map & (1 << bgx))) 285 continue; 286 lmac_cnt = bgx_get_lmac_count(nic->node, bgx); 287 for (lmac = 0; lmac < lmac_cnt; lmac++) 288 nic->vf_lmac_map[next_bgx_lmac++] = 289 NIC_SET_VF_LMAC_MAP(bgx, lmac); 290 nic->num_vf_en += lmac_cnt; 291 292 /* Program LMAC credits */ 293 lmac_credit = (1ull << 1); /* channel credit enable */ 294 lmac_credit |= (0x1ff << 2); /* Max outstanding pkt count */ 295 /* 48KB BGX Tx buffer size, each unit is of size 16bytes */ 296 lmac_credit |= (((((48 * 1024) / lmac_cnt) - 297 NIC_HW_MAX_FRS) / 16) << 12); 298 lmac = bgx * MAX_LMAC_PER_BGX; 299 for (; lmac < lmac_cnt + (bgx * MAX_LMAC_PER_BGX); lmac++) 300 nic_reg_write(nic, 301 NIC_PF_LMAC_0_7_CREDIT + (lmac * 8), 302 lmac_credit); 303 } 304 } 305 306 #define BGX0_BLOCK 8 307 #define BGX1_BLOCK 9 308 309 static void nic_init_hw(struct nicpf *nic) 310 { 311 int i; 312 313 /* Enable NIC HW block */ 314 nic_reg_write(nic, NIC_PF_CFG, 0x3); 315 316 /* Enable backpressure */ 317 nic_reg_write(nic, NIC_PF_BP_CFG, (1ULL << 6) | 0x03); 318 319 /* Disable TNS mode on both interfaces */ 320 nic_reg_write(nic, NIC_PF_INTF_0_1_SEND_CFG, 321 (NIC_TNS_BYPASS_MODE << 7) | BGX0_BLOCK); 322 nic_reg_write(nic, NIC_PF_INTF_0_1_SEND_CFG | (1 << 8), 323 (NIC_TNS_BYPASS_MODE << 7) | BGX1_BLOCK); 324 nic_reg_write(nic, NIC_PF_INTF_0_1_BP_CFG, 325 (1ULL << 63) | BGX0_BLOCK); 326 nic_reg_write(nic, NIC_PF_INTF_0_1_BP_CFG + (1 << 8), 327 (1ULL << 63) | BGX1_BLOCK); 328 329 /* PKIND configuration */ 330 nic->pkind.minlen = 0; 331 nic->pkind.maxlen = NIC_HW_MAX_FRS + ETH_HLEN; 332 nic->pkind.lenerr_en = 1; 333 nic->pkind.rx_hdr = 0; 334 nic->pkind.hdr_sl = 0; 335 336 for (i = 0; i < NIC_MAX_PKIND; i++) 337 nic_reg_write(nic, NIC_PF_PKIND_0_15_CFG | (i << 3), 338 *(u64 *)&nic->pkind); 339 340 nic_set_tx_pkt_pad(nic, NIC_HW_MIN_FRS); 341 342 /* Timer config */ 343 nic_reg_write(nic, NIC_PF_INTR_TIMER_CFG, NICPF_CLK_PER_INT_TICK); 344 345 /* Enable VLAN ethertype matching and stripping */ 346 nic_reg_write(nic, NIC_PF_RX_ETYPE_0_7, 347 (2 << 19) | (ETYPE_ALG_VLAN_STRIP << 16) | ETH_P_8021Q); 348 } 349 350 /* Channel parse index configuration */ 351 static void nic_config_cpi(struct nicpf *nic, struct cpi_cfg_msg *cfg) 352 { 353 u32 vnic, bgx, lmac, chan; 354 u32 padd, cpi_count = 0; 355 u64 cpi_base, cpi, rssi_base, rssi; 356 u8 qset, rq_idx = 0; 357 358 vnic = cfg->vf_id; 359 bgx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vnic]); 360 lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vnic]); 361 362 chan = (lmac * MAX_BGX_CHANS_PER_LMAC) + (bgx * NIC_CHANS_PER_INF); 363 cpi_base = (lmac * NIC_MAX_CPI_PER_LMAC) + (bgx * NIC_CPI_PER_BGX); 364 rssi_base = (lmac * nic->rss_ind_tbl_size) + (bgx * NIC_RSSI_PER_BGX); 365 366 /* Rx channel configuration */ 367 nic_reg_write(nic, NIC_PF_CHAN_0_255_RX_BP_CFG | (chan << 3), 368 (1ull << 63) | (vnic << 0)); 369 nic_reg_write(nic, NIC_PF_CHAN_0_255_RX_CFG | (chan << 3), 370 ((u64)cfg->cpi_alg << 62) | (cpi_base << 48)); 371 372 if (cfg->cpi_alg == CPI_ALG_NONE) 373 cpi_count = 1; 374 else if (cfg->cpi_alg == CPI_ALG_VLAN) /* 3 bits of PCP */ 375 cpi_count = 8; 376 else if (cfg->cpi_alg == CPI_ALG_VLAN16) /* 3 bits PCP + DEI */ 377 cpi_count = 16; 378 else if (cfg->cpi_alg == CPI_ALG_DIFF) /* 6bits DSCP */ 379 cpi_count = NIC_MAX_CPI_PER_LMAC; 380 381 /* RSS Qset, Qidx mapping */ 382 qset = cfg->vf_id; 383 rssi = rssi_base; 384 for (; rssi < (rssi_base + cfg->rq_cnt); rssi++) { 385 nic_reg_write(nic, NIC_PF_RSSI_0_4097_RQ | (rssi << 3), 386 (qset << 3) | rq_idx); 387 rq_idx++; 388 } 389 390 rssi = 0; 391 cpi = cpi_base; 392 for (; cpi < (cpi_base + cpi_count); cpi++) { 393 /* Determine port to channel adder */ 394 if (cfg->cpi_alg != CPI_ALG_DIFF) 395 padd = cpi % cpi_count; 396 else 397 padd = cpi % 8; /* 3 bits CS out of 6bits DSCP */ 398 399 /* Leave RSS_SIZE as '0' to disable RSS */ 400 if (pass1_silicon(nic)) { 401 nic_reg_write(nic, NIC_PF_CPI_0_2047_CFG | (cpi << 3), 402 (vnic << 24) | (padd << 16) | 403 (rssi_base + rssi)); 404 } else { 405 /* Set MPI_ALG to '0' to disable MCAM parsing */ 406 nic_reg_write(nic, NIC_PF_CPI_0_2047_CFG | (cpi << 3), 407 (padd << 16)); 408 /* MPI index is same as CPI if MPI_ALG is not enabled */ 409 nic_reg_write(nic, NIC_PF_MPI_0_2047_CFG | (cpi << 3), 410 (vnic << 24) | (rssi_base + rssi)); 411 } 412 413 if ((rssi + 1) >= cfg->rq_cnt) 414 continue; 415 416 if (cfg->cpi_alg == CPI_ALG_VLAN) 417 rssi++; 418 else if (cfg->cpi_alg == CPI_ALG_VLAN16) 419 rssi = ((cpi - cpi_base) & 0xe) >> 1; 420 else if (cfg->cpi_alg == CPI_ALG_DIFF) 421 rssi = ((cpi - cpi_base) & 0x38) >> 3; 422 } 423 nic->cpi_base[cfg->vf_id] = cpi_base; 424 nic->rssi_base[cfg->vf_id] = rssi_base; 425 } 426 427 /* Responsds to VF with its RSS indirection table size */ 428 static void nic_send_rss_size(struct nicpf *nic, int vf) 429 { 430 union nic_mbx mbx = {}; 431 u64 *msg; 432 433 msg = (u64 *)&mbx; 434 435 mbx.rss_size.msg = NIC_MBOX_MSG_RSS_SIZE; 436 mbx.rss_size.ind_tbl_size = nic->rss_ind_tbl_size; 437 nic_send_msg_to_vf(nic, vf, &mbx); 438 } 439 440 /* Receive side scaling configuration 441 * configure: 442 * - RSS index 443 * - indir table i.e hash::RQ mapping 444 * - no of hash bits to consider 445 */ 446 static void nic_config_rss(struct nicpf *nic, struct rss_cfg_msg *cfg) 447 { 448 u8 qset, idx = 0; 449 u64 cpi_cfg, cpi_base, rssi_base, rssi; 450 u64 idx_addr; 451 452 rssi_base = nic->rssi_base[cfg->vf_id] + cfg->tbl_offset; 453 454 rssi = rssi_base; 455 qset = cfg->vf_id; 456 457 for (; rssi < (rssi_base + cfg->tbl_len); rssi++) { 458 u8 svf = cfg->ind_tbl[idx] >> 3; 459 460 if (svf) 461 qset = nic->vf_sqs[cfg->vf_id][svf - 1]; 462 else 463 qset = cfg->vf_id; 464 nic_reg_write(nic, NIC_PF_RSSI_0_4097_RQ | (rssi << 3), 465 (qset << 3) | (cfg->ind_tbl[idx] & 0x7)); 466 idx++; 467 } 468 469 cpi_base = nic->cpi_base[cfg->vf_id]; 470 if (pass1_silicon(nic)) 471 idx_addr = NIC_PF_CPI_0_2047_CFG; 472 else 473 idx_addr = NIC_PF_MPI_0_2047_CFG; 474 cpi_cfg = nic_reg_read(nic, idx_addr | (cpi_base << 3)); 475 cpi_cfg &= ~(0xFULL << 20); 476 cpi_cfg |= (cfg->hash_bits << 20); 477 nic_reg_write(nic, idx_addr | (cpi_base << 3), cpi_cfg); 478 } 479 480 /* 4 level transmit side scheduler configutation 481 * for TNS bypass mode 482 * 483 * Sample configuration for SQ0 484 * VNIC0-SQ0 -> TL4(0) -> TL3[0] -> TL2[0] -> TL1[0] -> BGX0 485 * VNIC1-SQ0 -> TL4(8) -> TL3[2] -> TL2[0] -> TL1[0] -> BGX0 486 * VNIC2-SQ0 -> TL4(16) -> TL3[4] -> TL2[1] -> TL1[0] -> BGX0 487 * VNIC3-SQ0 -> TL4(24) -> TL3[6] -> TL2[1] -> TL1[0] -> BGX0 488 * VNIC4-SQ0 -> TL4(512) -> TL3[128] -> TL2[32] -> TL1[1] -> BGX1 489 * VNIC5-SQ0 -> TL4(520) -> TL3[130] -> TL2[32] -> TL1[1] -> BGX1 490 * VNIC6-SQ0 -> TL4(528) -> TL3[132] -> TL2[33] -> TL1[1] -> BGX1 491 * VNIC7-SQ0 -> TL4(536) -> TL3[134] -> TL2[33] -> TL1[1] -> BGX1 492 */ 493 static void nic_tx_channel_cfg(struct nicpf *nic, u8 vnic, 494 struct sq_cfg_msg *sq) 495 { 496 u32 bgx, lmac, chan; 497 u32 tl2, tl3, tl4; 498 u32 rr_quantum; 499 u8 sq_idx = sq->sq_num; 500 u8 pqs_vnic; 501 502 if (sq->sqs_mode) 503 pqs_vnic = nic->pqs_vf[vnic]; 504 else 505 pqs_vnic = vnic; 506 507 bgx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[pqs_vnic]); 508 lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[pqs_vnic]); 509 510 /* 24 bytes for FCS, IPG and preamble */ 511 rr_quantum = ((NIC_HW_MAX_FRS + 24) / 4); 512 513 tl4 = (lmac * NIC_TL4_PER_LMAC) + (bgx * NIC_TL4_PER_BGX); 514 tl4 += sq_idx; 515 if (sq->sqs_mode) 516 tl4 += vnic * 8; 517 518 tl3 = tl4 / (NIC_MAX_TL4 / NIC_MAX_TL3); 519 nic_reg_write(nic, NIC_PF_QSET_0_127_SQ_0_7_CFG2 | 520 ((u64)vnic << NIC_QS_ID_SHIFT) | 521 ((u32)sq_idx << NIC_Q_NUM_SHIFT), tl4); 522 nic_reg_write(nic, NIC_PF_TL4_0_1023_CFG | (tl4 << 3), 523 ((u64)vnic << 27) | ((u32)sq_idx << 24) | rr_quantum); 524 525 nic_reg_write(nic, NIC_PF_TL3_0_255_CFG | (tl3 << 3), rr_quantum); 526 chan = (lmac * MAX_BGX_CHANS_PER_LMAC) + (bgx * NIC_CHANS_PER_INF); 527 nic_reg_write(nic, NIC_PF_TL3_0_255_CHAN | (tl3 << 3), chan); 528 /* Enable backpressure on the channel */ 529 nic_reg_write(nic, NIC_PF_CHAN_0_255_TX_CFG | (chan << 3), 1); 530 531 tl2 = tl3 >> 2; 532 nic_reg_write(nic, NIC_PF_TL3A_0_63_CFG | (tl2 << 3), tl2); 533 nic_reg_write(nic, NIC_PF_TL2_0_63_CFG | (tl2 << 3), rr_quantum); 534 /* No priorities as of now */ 535 nic_reg_write(nic, NIC_PF_TL2_0_63_PRI | (tl2 << 3), 0x00); 536 } 537 538 /* Send primary nicvf pointer to secondary QS's VF */ 539 static void nic_send_pnicvf(struct nicpf *nic, int sqs) 540 { 541 union nic_mbx mbx = {}; 542 543 mbx.nicvf.msg = NIC_MBOX_MSG_PNICVF_PTR; 544 mbx.nicvf.nicvf = nic->nicvf[nic->pqs_vf[sqs]]; 545 nic_send_msg_to_vf(nic, sqs, &mbx); 546 } 547 548 /* Send SQS's nicvf pointer to primary QS's VF */ 549 static void nic_send_snicvf(struct nicpf *nic, struct nicvf_ptr *nicvf) 550 { 551 union nic_mbx mbx = {}; 552 int sqs_id = nic->vf_sqs[nicvf->vf_id][nicvf->sqs_id]; 553 554 mbx.nicvf.msg = NIC_MBOX_MSG_SNICVF_PTR; 555 mbx.nicvf.sqs_id = nicvf->sqs_id; 556 mbx.nicvf.nicvf = nic->nicvf[sqs_id]; 557 nic_send_msg_to_vf(nic, nicvf->vf_id, &mbx); 558 } 559 560 /* Find next available Qset that can be assigned as a 561 * secondary Qset to a VF. 562 */ 563 static int nic_nxt_avail_sqs(struct nicpf *nic) 564 { 565 int sqs; 566 567 for (sqs = 0; sqs < nic->num_sqs_en; sqs++) { 568 if (!nic->sqs_used[sqs]) 569 nic->sqs_used[sqs] = true; 570 else 571 continue; 572 return sqs + nic->num_vf_en; 573 } 574 return -1; 575 } 576 577 /* Allocate additional Qsets for requested VF */ 578 static void nic_alloc_sqs(struct nicpf *nic, struct sqs_alloc *sqs) 579 { 580 union nic_mbx mbx = {}; 581 int idx, alloc_qs = 0; 582 int sqs_id; 583 584 if (!nic->num_sqs_en) 585 goto send_mbox; 586 587 for (idx = 0; idx < sqs->qs_count; idx++) { 588 sqs_id = nic_nxt_avail_sqs(nic); 589 if (sqs_id < 0) 590 break; 591 nic->vf_sqs[sqs->vf_id][idx] = sqs_id; 592 nic->pqs_vf[sqs_id] = sqs->vf_id; 593 alloc_qs++; 594 } 595 596 send_mbox: 597 mbx.sqs_alloc.msg = NIC_MBOX_MSG_ALLOC_SQS; 598 mbx.sqs_alloc.vf_id = sqs->vf_id; 599 mbx.sqs_alloc.qs_count = alloc_qs; 600 nic_send_msg_to_vf(nic, sqs->vf_id, &mbx); 601 } 602 603 static int nic_config_loopback(struct nicpf *nic, struct set_loopback *lbk) 604 { 605 int bgx_idx, lmac_idx; 606 607 if (lbk->vf_id > MAX_LMAC) 608 return -1; 609 610 bgx_idx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[lbk->vf_id]); 611 lmac_idx = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[lbk->vf_id]); 612 613 bgx_lmac_internal_loopback(nic->node, bgx_idx, lmac_idx, lbk->enable); 614 615 return 0; 616 } 617 618 static void nic_enable_vf(struct nicpf *nic, int vf, bool enable) 619 { 620 int bgx, lmac; 621 622 nic->vf_enabled[vf] = enable; 623 624 if (vf >= nic->num_vf_en) 625 return; 626 627 bgx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vf]); 628 lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vf]); 629 630 bgx_lmac_rx_tx_enable(nic->node, bgx, lmac, enable); 631 } 632 633 /* Interrupt handler to handle mailbox messages from VFs */ 634 static void nic_handle_mbx_intr(struct nicpf *nic, int vf) 635 { 636 union nic_mbx mbx = {}; 637 u64 *mbx_data; 638 u64 mbx_addr; 639 u64 reg_addr; 640 u64 cfg; 641 int bgx, lmac; 642 int i; 643 int ret = 0; 644 645 nic->mbx_lock[vf] = true; 646 647 mbx_addr = nic_get_mbx_addr(vf); 648 mbx_data = (u64 *)&mbx; 649 650 for (i = 0; i < NIC_PF_VF_MAILBOX_SIZE; i++) { 651 *mbx_data = nic_reg_read(nic, mbx_addr); 652 mbx_data++; 653 mbx_addr += sizeof(u64); 654 } 655 656 dev_dbg(&nic->pdev->dev, "%s: Mailbox msg %d from VF%d\n", 657 __func__, mbx.msg.msg, vf); 658 switch (mbx.msg.msg) { 659 case NIC_MBOX_MSG_READY: 660 nic_mbx_send_ready(nic, vf); 661 if (vf < MAX_LMAC) { 662 nic->link[vf] = 0; 663 nic->duplex[vf] = 0; 664 nic->speed[vf] = 0; 665 } 666 ret = 1; 667 break; 668 case NIC_MBOX_MSG_QS_CFG: 669 reg_addr = NIC_PF_QSET_0_127_CFG | 670 (mbx.qs.num << NIC_QS_ID_SHIFT); 671 cfg = mbx.qs.cfg; 672 /* Check if its a secondary Qset */ 673 if (vf >= nic->num_vf_en) { 674 cfg = cfg & (~0x7FULL); 675 /* Assign this Qset to primary Qset's VF */ 676 cfg |= nic->pqs_vf[vf]; 677 } 678 nic_reg_write(nic, reg_addr, cfg); 679 break; 680 case NIC_MBOX_MSG_RQ_CFG: 681 reg_addr = NIC_PF_QSET_0_127_RQ_0_7_CFG | 682 (mbx.rq.qs_num << NIC_QS_ID_SHIFT) | 683 (mbx.rq.rq_num << NIC_Q_NUM_SHIFT); 684 nic_reg_write(nic, reg_addr, mbx.rq.cfg); 685 break; 686 case NIC_MBOX_MSG_RQ_BP_CFG: 687 reg_addr = NIC_PF_QSET_0_127_RQ_0_7_BP_CFG | 688 (mbx.rq.qs_num << NIC_QS_ID_SHIFT) | 689 (mbx.rq.rq_num << NIC_Q_NUM_SHIFT); 690 nic_reg_write(nic, reg_addr, mbx.rq.cfg); 691 break; 692 case NIC_MBOX_MSG_RQ_SW_SYNC: 693 ret = nic_rcv_queue_sw_sync(nic); 694 break; 695 case NIC_MBOX_MSG_RQ_DROP_CFG: 696 reg_addr = NIC_PF_QSET_0_127_RQ_0_7_DROP_CFG | 697 (mbx.rq.qs_num << NIC_QS_ID_SHIFT) | 698 (mbx.rq.rq_num << NIC_Q_NUM_SHIFT); 699 nic_reg_write(nic, reg_addr, mbx.rq.cfg); 700 break; 701 case NIC_MBOX_MSG_SQ_CFG: 702 reg_addr = NIC_PF_QSET_0_127_SQ_0_7_CFG | 703 (mbx.sq.qs_num << NIC_QS_ID_SHIFT) | 704 (mbx.sq.sq_num << NIC_Q_NUM_SHIFT); 705 nic_reg_write(nic, reg_addr, mbx.sq.cfg); 706 nic_tx_channel_cfg(nic, mbx.qs.num, &mbx.sq); 707 break; 708 case NIC_MBOX_MSG_SET_MAC: 709 if (vf >= nic->num_vf_en) 710 break; 711 lmac = mbx.mac.vf_id; 712 bgx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[lmac]); 713 lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[lmac]); 714 bgx_set_lmac_mac(nic->node, bgx, lmac, mbx.mac.mac_addr); 715 break; 716 case NIC_MBOX_MSG_SET_MAX_FRS: 717 ret = nic_update_hw_frs(nic, mbx.frs.max_frs, 718 mbx.frs.vf_id); 719 break; 720 case NIC_MBOX_MSG_CPI_CFG: 721 nic_config_cpi(nic, &mbx.cpi_cfg); 722 break; 723 case NIC_MBOX_MSG_RSS_SIZE: 724 nic_send_rss_size(nic, vf); 725 goto unlock; 726 case NIC_MBOX_MSG_RSS_CFG: 727 case NIC_MBOX_MSG_RSS_CFG_CONT: 728 nic_config_rss(nic, &mbx.rss_cfg); 729 break; 730 case NIC_MBOX_MSG_CFG_DONE: 731 /* Last message of VF config msg sequence */ 732 nic_enable_vf(nic, vf, true); 733 goto unlock; 734 case NIC_MBOX_MSG_SHUTDOWN: 735 /* First msg in VF teardown sequence */ 736 if (vf >= nic->num_vf_en) 737 nic->sqs_used[vf - nic->num_vf_en] = false; 738 nic->pqs_vf[vf] = 0; 739 nic_enable_vf(nic, vf, false); 740 break; 741 case NIC_MBOX_MSG_ALLOC_SQS: 742 nic_alloc_sqs(nic, &mbx.sqs_alloc); 743 goto unlock; 744 case NIC_MBOX_MSG_NICVF_PTR: 745 nic->nicvf[vf] = mbx.nicvf.nicvf; 746 break; 747 case NIC_MBOX_MSG_PNICVF_PTR: 748 nic_send_pnicvf(nic, vf); 749 goto unlock; 750 case NIC_MBOX_MSG_SNICVF_PTR: 751 nic_send_snicvf(nic, &mbx.nicvf); 752 goto unlock; 753 case NIC_MBOX_MSG_BGX_STATS: 754 nic_get_bgx_stats(nic, &mbx.bgx_stats); 755 goto unlock; 756 case NIC_MBOX_MSG_LOOPBACK: 757 ret = nic_config_loopback(nic, &mbx.lbk); 758 break; 759 default: 760 dev_err(&nic->pdev->dev, 761 "Invalid msg from VF%d, msg 0x%x\n", vf, mbx.msg.msg); 762 break; 763 } 764 765 if (!ret) 766 nic_mbx_send_ack(nic, vf); 767 else if (mbx.msg.msg != NIC_MBOX_MSG_READY) 768 nic_mbx_send_nack(nic, vf); 769 unlock: 770 nic->mbx_lock[vf] = false; 771 } 772 773 static void nic_mbx_intr_handler (struct nicpf *nic, int mbx) 774 { 775 u64 intr; 776 u8 vf, vf_per_mbx_reg = 64; 777 778 intr = nic_reg_read(nic, NIC_PF_MAILBOX_INT + (mbx << 3)); 779 dev_dbg(&nic->pdev->dev, "PF interrupt Mbox%d 0x%llx\n", mbx, intr); 780 for (vf = 0; vf < vf_per_mbx_reg; vf++) { 781 if (intr & (1ULL << vf)) { 782 dev_dbg(&nic->pdev->dev, "Intr from VF %d\n", 783 vf + (mbx * vf_per_mbx_reg)); 784 785 nic_handle_mbx_intr(nic, vf + (mbx * vf_per_mbx_reg)); 786 nic_clear_mbx_intr(nic, vf, mbx); 787 } 788 } 789 } 790 791 static irqreturn_t nic_mbx0_intr_handler (int irq, void *nic_irq) 792 { 793 struct nicpf *nic = (struct nicpf *)nic_irq; 794 795 nic_mbx_intr_handler(nic, 0); 796 797 return IRQ_HANDLED; 798 } 799 800 static irqreturn_t nic_mbx1_intr_handler (int irq, void *nic_irq) 801 { 802 struct nicpf *nic = (struct nicpf *)nic_irq; 803 804 nic_mbx_intr_handler(nic, 1); 805 806 return IRQ_HANDLED; 807 } 808 809 static int nic_enable_msix(struct nicpf *nic) 810 { 811 int i, ret; 812 813 nic->num_vec = NIC_PF_MSIX_VECTORS; 814 815 for (i = 0; i < nic->num_vec; i++) 816 nic->msix_entries[i].entry = i; 817 818 ret = pci_enable_msix(nic->pdev, nic->msix_entries, nic->num_vec); 819 if (ret) { 820 dev_err(&nic->pdev->dev, 821 "Request for #%d msix vectors failed\n", 822 nic->num_vec); 823 return ret; 824 } 825 826 nic->msix_enabled = 1; 827 return 0; 828 } 829 830 static void nic_disable_msix(struct nicpf *nic) 831 { 832 if (nic->msix_enabled) { 833 pci_disable_msix(nic->pdev); 834 nic->msix_enabled = 0; 835 nic->num_vec = 0; 836 } 837 } 838 839 static void nic_free_all_interrupts(struct nicpf *nic) 840 { 841 int irq; 842 843 for (irq = 0; irq < nic->num_vec; irq++) { 844 if (nic->irq_allocated[irq]) 845 free_irq(nic->msix_entries[irq].vector, nic); 846 nic->irq_allocated[irq] = false; 847 } 848 } 849 850 static int nic_register_interrupts(struct nicpf *nic) 851 { 852 int ret; 853 854 /* Enable MSI-X */ 855 ret = nic_enable_msix(nic); 856 if (ret) 857 return ret; 858 859 /* Register mailbox interrupt handlers */ 860 ret = request_irq(nic->msix_entries[NIC_PF_INTR_ID_MBOX0].vector, 861 nic_mbx0_intr_handler, 0, "NIC Mbox0", nic); 862 if (ret) 863 goto fail; 864 865 nic->irq_allocated[NIC_PF_INTR_ID_MBOX0] = true; 866 867 ret = request_irq(nic->msix_entries[NIC_PF_INTR_ID_MBOX1].vector, 868 nic_mbx1_intr_handler, 0, "NIC Mbox1", nic); 869 if (ret) 870 goto fail; 871 872 nic->irq_allocated[NIC_PF_INTR_ID_MBOX1] = true; 873 874 /* Enable mailbox interrupt */ 875 nic_enable_mbx_intr(nic); 876 return 0; 877 878 fail: 879 dev_err(&nic->pdev->dev, "Request irq failed\n"); 880 nic_free_all_interrupts(nic); 881 return ret; 882 } 883 884 static void nic_unregister_interrupts(struct nicpf *nic) 885 { 886 nic_free_all_interrupts(nic); 887 nic_disable_msix(nic); 888 } 889 890 static int nic_num_sqs_en(struct nicpf *nic, int vf_en) 891 { 892 int pos, sqs_per_vf = MAX_SQS_PER_VF_SINGLE_NODE; 893 u16 total_vf; 894 895 /* Check if its a multi-node environment */ 896 if (nr_node_ids > 1) 897 sqs_per_vf = MAX_SQS_PER_VF; 898 899 pos = pci_find_ext_capability(nic->pdev, PCI_EXT_CAP_ID_SRIOV); 900 pci_read_config_word(nic->pdev, (pos + PCI_SRIOV_TOTAL_VF), &total_vf); 901 return min(total_vf - vf_en, vf_en * sqs_per_vf); 902 } 903 904 static int nic_sriov_init(struct pci_dev *pdev, struct nicpf *nic) 905 { 906 int pos = 0; 907 int vf_en; 908 int err; 909 u16 total_vf_cnt; 910 911 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV); 912 if (!pos) { 913 dev_err(&pdev->dev, "SRIOV capability is not found in PCIe config space\n"); 914 return -ENODEV; 915 } 916 917 pci_read_config_word(pdev, (pos + PCI_SRIOV_TOTAL_VF), &total_vf_cnt); 918 if (total_vf_cnt < nic->num_vf_en) 919 nic->num_vf_en = total_vf_cnt; 920 921 if (!total_vf_cnt) 922 return 0; 923 924 vf_en = nic->num_vf_en; 925 nic->num_sqs_en = nic_num_sqs_en(nic, nic->num_vf_en); 926 vf_en += nic->num_sqs_en; 927 928 err = pci_enable_sriov(pdev, vf_en); 929 if (err) { 930 dev_err(&pdev->dev, "SRIOV enable failed, num VF is %d\n", 931 vf_en); 932 nic->num_vf_en = 0; 933 return err; 934 } 935 936 dev_info(&pdev->dev, "SRIOV enabled, number of VF available %d\n", 937 vf_en); 938 939 nic->flags |= NIC_SRIOV_ENABLED; 940 return 0; 941 } 942 943 /* Poll for BGX LMAC link status and update corresponding VF 944 * if there is a change, valid only if internal L2 switch 945 * is not present otherwise VF link is always treated as up 946 */ 947 static void nic_poll_for_link(struct work_struct *work) 948 { 949 union nic_mbx mbx = {}; 950 struct nicpf *nic; 951 struct bgx_link_status link; 952 u8 vf, bgx, lmac; 953 954 nic = container_of(work, struct nicpf, dwork.work); 955 956 mbx.link_status.msg = NIC_MBOX_MSG_BGX_LINK_CHANGE; 957 958 for (vf = 0; vf < nic->num_vf_en; vf++) { 959 /* Poll only if VF is UP */ 960 if (!nic->vf_enabled[vf]) 961 continue; 962 963 /* Get BGX, LMAC indices for the VF */ 964 bgx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vf]); 965 lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vf]); 966 /* Get interface link status */ 967 bgx_get_lmac_link_state(nic->node, bgx, lmac, &link); 968 969 /* Inform VF only if link status changed */ 970 if (nic->link[vf] == link.link_up) 971 continue; 972 973 if (!nic->mbx_lock[vf]) { 974 nic->link[vf] = link.link_up; 975 nic->duplex[vf] = link.duplex; 976 nic->speed[vf] = link.speed; 977 978 /* Send a mbox message to VF with current link status */ 979 mbx.link_status.link_up = link.link_up; 980 mbx.link_status.duplex = link.duplex; 981 mbx.link_status.speed = link.speed; 982 nic_send_msg_to_vf(nic, vf, &mbx); 983 } 984 } 985 queue_delayed_work(nic->check_link, &nic->dwork, HZ * 2); 986 } 987 988 static int nic_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 989 { 990 struct device *dev = &pdev->dev; 991 struct nicpf *nic; 992 int err; 993 994 BUILD_BUG_ON(sizeof(union nic_mbx) > 16); 995 996 nic = devm_kzalloc(dev, sizeof(*nic), GFP_KERNEL); 997 if (!nic) 998 return -ENOMEM; 999 1000 pci_set_drvdata(pdev, nic); 1001 1002 nic->pdev = pdev; 1003 1004 err = pci_enable_device(pdev); 1005 if (err) { 1006 dev_err(dev, "Failed to enable PCI device\n"); 1007 pci_set_drvdata(pdev, NULL); 1008 return err; 1009 } 1010 1011 err = pci_request_regions(pdev, DRV_NAME); 1012 if (err) { 1013 dev_err(dev, "PCI request regions failed 0x%x\n", err); 1014 goto err_disable_device; 1015 } 1016 1017 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(48)); 1018 if (err) { 1019 dev_err(dev, "Unable to get usable DMA configuration\n"); 1020 goto err_release_regions; 1021 } 1022 1023 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(48)); 1024 if (err) { 1025 dev_err(dev, "Unable to get 48-bit DMA for consistent allocations\n"); 1026 goto err_release_regions; 1027 } 1028 1029 /* MAP PF's configuration registers */ 1030 nic->reg_base = pcim_iomap(pdev, PCI_CFG_REG_BAR_NUM, 0); 1031 if (!nic->reg_base) { 1032 dev_err(dev, "Cannot map config register space, aborting\n"); 1033 err = -ENOMEM; 1034 goto err_release_regions; 1035 } 1036 1037 nic->node = nic_get_node_id(pdev); 1038 1039 nic_set_lmac_vf_mapping(nic); 1040 1041 /* Initialize hardware */ 1042 nic_init_hw(nic); 1043 1044 /* Set RSS TBL size for each VF */ 1045 nic->rss_ind_tbl_size = NIC_MAX_RSS_IDR_TBL_SIZE; 1046 1047 /* Register interrupts */ 1048 err = nic_register_interrupts(nic); 1049 if (err) 1050 goto err_release_regions; 1051 1052 /* Configure SRIOV */ 1053 err = nic_sriov_init(pdev, nic); 1054 if (err) 1055 goto err_unregister_interrupts; 1056 1057 /* Register a physical link status poll fn() */ 1058 nic->check_link = alloc_workqueue("check_link_status", 1059 WQ_UNBOUND | WQ_MEM_RECLAIM, 1); 1060 if (!nic->check_link) { 1061 err = -ENOMEM; 1062 goto err_disable_sriov; 1063 } 1064 1065 INIT_DELAYED_WORK(&nic->dwork, nic_poll_for_link); 1066 queue_delayed_work(nic->check_link, &nic->dwork, 0); 1067 1068 return 0; 1069 1070 err_disable_sriov: 1071 if (nic->flags & NIC_SRIOV_ENABLED) 1072 pci_disable_sriov(pdev); 1073 err_unregister_interrupts: 1074 nic_unregister_interrupts(nic); 1075 err_release_regions: 1076 pci_release_regions(pdev); 1077 err_disable_device: 1078 pci_disable_device(pdev); 1079 pci_set_drvdata(pdev, NULL); 1080 return err; 1081 } 1082 1083 static void nic_remove(struct pci_dev *pdev) 1084 { 1085 struct nicpf *nic = pci_get_drvdata(pdev); 1086 1087 if (nic->flags & NIC_SRIOV_ENABLED) 1088 pci_disable_sriov(pdev); 1089 1090 if (nic->check_link) { 1091 /* Destroy work Queue */ 1092 cancel_delayed_work_sync(&nic->dwork); 1093 destroy_workqueue(nic->check_link); 1094 } 1095 1096 nic_unregister_interrupts(nic); 1097 pci_release_regions(pdev); 1098 pci_disable_device(pdev); 1099 pci_set_drvdata(pdev, NULL); 1100 } 1101 1102 static struct pci_driver nic_driver = { 1103 .name = DRV_NAME, 1104 .id_table = nic_id_table, 1105 .probe = nic_probe, 1106 .remove = nic_remove, 1107 }; 1108 1109 static int __init nic_init_module(void) 1110 { 1111 pr_info("%s, ver %s\n", DRV_NAME, DRV_VERSION); 1112 1113 return pci_register_driver(&nic_driver); 1114 } 1115 1116 static void __exit nic_cleanup_module(void) 1117 { 1118 pci_unregister_driver(&nic_driver); 1119 } 1120 1121 module_init(nic_init_module); 1122 module_exit(nic_cleanup_module); 1123