1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2015 Cavium, Inc. 4 */ 5 6 #include <linux/module.h> 7 #include <linux/interrupt.h> 8 #include <linux/pci.h> 9 #include <linux/netdevice.h> 10 #include <linux/if_vlan.h> 11 #include <linux/etherdevice.h> 12 #include <linux/ethtool.h> 13 #include <linux/log2.h> 14 #include <linux/prefetch.h> 15 #include <linux/irq.h> 16 #include <linux/iommu.h> 17 #include <linux/bpf.h> 18 #include <linux/bpf_trace.h> 19 #include <linux/filter.h> 20 #include <linux/net_tstamp.h> 21 #include <linux/workqueue.h> 22 23 #include "nic_reg.h" 24 #include "nic.h" 25 #include "nicvf_queues.h" 26 #include "thunder_bgx.h" 27 #include "../common/cavium_ptp.h" 28 29 #define DRV_NAME "nicvf" 30 #define DRV_VERSION "1.0" 31 32 /* NOTE: Packets bigger than 1530 are split across multiple pages and XDP needs 33 * the buffer to be contiguous. Allow XDP to be set up only if we don't exceed 34 * this value, keeping headroom for the 14 byte Ethernet header and two 35 * VLAN tags (for QinQ) 36 */ 37 #define MAX_XDP_MTU (1530 - ETH_HLEN - VLAN_HLEN * 2) 38 39 /* Supported devices */ 40 static const struct pci_device_id nicvf_id_table[] = { 41 { PCI_DEVICE_SUB(PCI_VENDOR_ID_CAVIUM, 42 PCI_DEVICE_ID_THUNDER_NIC_VF, 43 PCI_VENDOR_ID_CAVIUM, 44 PCI_SUBSYS_DEVID_88XX_NIC_VF) }, 45 { PCI_DEVICE_SUB(PCI_VENDOR_ID_CAVIUM, 46 PCI_DEVICE_ID_THUNDER_PASS1_NIC_VF, 47 PCI_VENDOR_ID_CAVIUM, 48 PCI_SUBSYS_DEVID_88XX_PASS1_NIC_VF) }, 49 { PCI_DEVICE_SUB(PCI_VENDOR_ID_CAVIUM, 50 PCI_DEVICE_ID_THUNDER_NIC_VF, 51 PCI_VENDOR_ID_CAVIUM, 52 PCI_SUBSYS_DEVID_81XX_NIC_VF) }, 53 { PCI_DEVICE_SUB(PCI_VENDOR_ID_CAVIUM, 54 PCI_DEVICE_ID_THUNDER_NIC_VF, 55 PCI_VENDOR_ID_CAVIUM, 56 PCI_SUBSYS_DEVID_83XX_NIC_VF) }, 57 { 0, } /* end of table */ 58 }; 59 60 MODULE_AUTHOR("Sunil Goutham"); 61 MODULE_DESCRIPTION("Cavium Thunder NIC Virtual Function Driver"); 62 MODULE_LICENSE("GPL v2"); 63 MODULE_VERSION(DRV_VERSION); 64 MODULE_DEVICE_TABLE(pci, nicvf_id_table); 65 66 static int debug = 0x00; 67 module_param(debug, int, 0644); 68 MODULE_PARM_DESC(debug, "Debug message level bitmap"); 69 70 static int cpi_alg = CPI_ALG_NONE; 71 module_param(cpi_alg, int, 0444); 72 MODULE_PARM_DESC(cpi_alg, 73 "PFC algorithm (0=none, 1=VLAN, 2=VLAN16, 3=IP Diffserv)"); 74 75 static inline u8 nicvf_netdev_qidx(struct nicvf *nic, u8 qidx) 76 { 77 if (nic->sqs_mode) 78 return qidx + ((nic->sqs_id + 1) * MAX_CMP_QUEUES_PER_QS); 79 else 80 return qidx; 81 } 82 83 /* The Cavium ThunderX network controller can *only* be found in SoCs 84 * containing the ThunderX ARM64 CPU implementation. All accesses to the device 85 * registers on this platform are implicitly strongly ordered with respect 86 * to memory accesses. So writeq_relaxed() and readq_relaxed() are safe to use 87 * with no memory barriers in this driver. The readq()/writeq() functions add 88 * explicit ordering operation which in this case are redundant, and only 89 * add overhead. 90 */ 91 92 /* Register read/write APIs */ 93 void nicvf_reg_write(struct nicvf *nic, u64 offset, u64 val) 94 { 95 writeq_relaxed(val, nic->reg_base + offset); 96 } 97 98 u64 nicvf_reg_read(struct nicvf *nic, u64 offset) 99 { 100 return readq_relaxed(nic->reg_base + offset); 101 } 102 103 void nicvf_queue_reg_write(struct nicvf *nic, u64 offset, 104 u64 qidx, u64 val) 105 { 106 void __iomem *addr = nic->reg_base + offset; 107 108 writeq_relaxed(val, addr + (qidx << NIC_Q_NUM_SHIFT)); 109 } 110 111 u64 nicvf_queue_reg_read(struct nicvf *nic, u64 offset, u64 qidx) 112 { 113 void __iomem *addr = nic->reg_base + offset; 114 115 return readq_relaxed(addr + (qidx << NIC_Q_NUM_SHIFT)); 116 } 117 118 /* VF -> PF mailbox communication */ 119 static void nicvf_write_to_mbx(struct nicvf *nic, union nic_mbx *mbx) 120 { 121 u64 *msg = (u64 *)mbx; 122 123 nicvf_reg_write(nic, NIC_VF_PF_MAILBOX_0_1 + 0, msg[0]); 124 nicvf_reg_write(nic, NIC_VF_PF_MAILBOX_0_1 + 8, msg[1]); 125 } 126 127 int nicvf_send_msg_to_pf(struct nicvf *nic, union nic_mbx *mbx) 128 { 129 unsigned long timeout; 130 int ret = 0; 131 132 mutex_lock(&nic->rx_mode_mtx); 133 134 nic->pf_acked = false; 135 nic->pf_nacked = false; 136 137 nicvf_write_to_mbx(nic, mbx); 138 139 timeout = jiffies + msecs_to_jiffies(NIC_MBOX_MSG_TIMEOUT); 140 /* Wait for previous message to be acked, timeout 2sec */ 141 while (!nic->pf_acked) { 142 if (nic->pf_nacked) { 143 netdev_err(nic->netdev, 144 "PF NACK to mbox msg 0x%02x from VF%d\n", 145 (mbx->msg.msg & 0xFF), nic->vf_id); 146 ret = -EINVAL; 147 break; 148 } 149 usleep_range(8000, 10000); 150 if (nic->pf_acked) 151 break; 152 if (time_after(jiffies, timeout)) { 153 netdev_err(nic->netdev, 154 "PF didn't ACK to mbox msg 0x%02x from VF%d\n", 155 (mbx->msg.msg & 0xFF), nic->vf_id); 156 ret = -EBUSY; 157 break; 158 } 159 } 160 mutex_unlock(&nic->rx_mode_mtx); 161 return ret; 162 } 163 164 /* Checks if VF is able to comminicate with PF 165 * and also gets the VNIC number this VF is associated to. 166 */ 167 static int nicvf_check_pf_ready(struct nicvf *nic) 168 { 169 union nic_mbx mbx = {}; 170 171 mbx.msg.msg = NIC_MBOX_MSG_READY; 172 if (nicvf_send_msg_to_pf(nic, &mbx)) { 173 netdev_err(nic->netdev, 174 "PF didn't respond to READY msg\n"); 175 return 0; 176 } 177 178 return 1; 179 } 180 181 static void nicvf_send_cfg_done(struct nicvf *nic) 182 { 183 union nic_mbx mbx = {}; 184 185 mbx.msg.msg = NIC_MBOX_MSG_CFG_DONE; 186 if (nicvf_send_msg_to_pf(nic, &mbx)) { 187 netdev_err(nic->netdev, 188 "PF didn't respond to CFG DONE msg\n"); 189 } 190 } 191 192 static void nicvf_read_bgx_stats(struct nicvf *nic, struct bgx_stats_msg *bgx) 193 { 194 if (bgx->rx) 195 nic->bgx_stats.rx_stats[bgx->idx] = bgx->stats; 196 else 197 nic->bgx_stats.tx_stats[bgx->idx] = bgx->stats; 198 } 199 200 static void nicvf_handle_mbx_intr(struct nicvf *nic) 201 { 202 union nic_mbx mbx = {}; 203 u64 *mbx_data; 204 u64 mbx_addr; 205 int i; 206 207 mbx_addr = NIC_VF_PF_MAILBOX_0_1; 208 mbx_data = (u64 *)&mbx; 209 210 for (i = 0; i < NIC_PF_VF_MAILBOX_SIZE; i++) { 211 *mbx_data = nicvf_reg_read(nic, mbx_addr); 212 mbx_data++; 213 mbx_addr += sizeof(u64); 214 } 215 216 netdev_dbg(nic->netdev, "Mbox message: msg: 0x%x\n", mbx.msg.msg); 217 switch (mbx.msg.msg) { 218 case NIC_MBOX_MSG_READY: 219 nic->pf_acked = true; 220 nic->vf_id = mbx.nic_cfg.vf_id & 0x7F; 221 nic->tns_mode = mbx.nic_cfg.tns_mode & 0x7F; 222 nic->node = mbx.nic_cfg.node_id; 223 if (!nic->set_mac_pending) 224 ether_addr_copy(nic->netdev->dev_addr, 225 mbx.nic_cfg.mac_addr); 226 nic->sqs_mode = mbx.nic_cfg.sqs_mode; 227 nic->loopback_supported = mbx.nic_cfg.loopback_supported; 228 nic->link_up = false; 229 nic->duplex = 0; 230 nic->speed = 0; 231 break; 232 case NIC_MBOX_MSG_ACK: 233 nic->pf_acked = true; 234 break; 235 case NIC_MBOX_MSG_NACK: 236 nic->pf_nacked = true; 237 break; 238 case NIC_MBOX_MSG_RSS_SIZE: 239 nic->rss_info.rss_size = mbx.rss_size.ind_tbl_size; 240 nic->pf_acked = true; 241 break; 242 case NIC_MBOX_MSG_BGX_STATS: 243 nicvf_read_bgx_stats(nic, &mbx.bgx_stats); 244 nic->pf_acked = true; 245 break; 246 case NIC_MBOX_MSG_BGX_LINK_CHANGE: 247 nic->pf_acked = true; 248 if (nic->link_up != mbx.link_status.link_up) { 249 nic->link_up = mbx.link_status.link_up; 250 nic->duplex = mbx.link_status.duplex; 251 nic->speed = mbx.link_status.speed; 252 nic->mac_type = mbx.link_status.mac_type; 253 if (nic->link_up) { 254 netdev_info(nic->netdev, 255 "Link is Up %d Mbps %s duplex\n", 256 nic->speed, 257 nic->duplex == DUPLEX_FULL ? 258 "Full" : "Half"); 259 netif_carrier_on(nic->netdev); 260 netif_tx_start_all_queues(nic->netdev); 261 } else { 262 netdev_info(nic->netdev, "Link is Down\n"); 263 netif_carrier_off(nic->netdev); 264 netif_tx_stop_all_queues(nic->netdev); 265 } 266 } 267 break; 268 case NIC_MBOX_MSG_ALLOC_SQS: 269 nic->sqs_count = mbx.sqs_alloc.qs_count; 270 nic->pf_acked = true; 271 break; 272 case NIC_MBOX_MSG_SNICVF_PTR: 273 /* Primary VF: make note of secondary VF's pointer 274 * to be used while packet transmission. 275 */ 276 nic->snicvf[mbx.nicvf.sqs_id] = 277 (struct nicvf *)mbx.nicvf.nicvf; 278 nic->pf_acked = true; 279 break; 280 case NIC_MBOX_MSG_PNICVF_PTR: 281 /* Secondary VF/Qset: make note of primary VF's pointer 282 * to be used while packet reception, to handover packet 283 * to primary VF's netdev. 284 */ 285 nic->pnicvf = (struct nicvf *)mbx.nicvf.nicvf; 286 nic->pf_acked = true; 287 break; 288 case NIC_MBOX_MSG_PFC: 289 nic->pfc.autoneg = mbx.pfc.autoneg; 290 nic->pfc.fc_rx = mbx.pfc.fc_rx; 291 nic->pfc.fc_tx = mbx.pfc.fc_tx; 292 nic->pf_acked = true; 293 break; 294 default: 295 netdev_err(nic->netdev, 296 "Invalid message from PF, msg 0x%x\n", mbx.msg.msg); 297 break; 298 } 299 nicvf_clear_intr(nic, NICVF_INTR_MBOX, 0); 300 } 301 302 static int nicvf_hw_set_mac_addr(struct nicvf *nic, struct net_device *netdev) 303 { 304 union nic_mbx mbx = {}; 305 306 mbx.mac.msg = NIC_MBOX_MSG_SET_MAC; 307 mbx.mac.vf_id = nic->vf_id; 308 ether_addr_copy(mbx.mac.mac_addr, netdev->dev_addr); 309 310 return nicvf_send_msg_to_pf(nic, &mbx); 311 } 312 313 static void nicvf_config_cpi(struct nicvf *nic) 314 { 315 union nic_mbx mbx = {}; 316 317 mbx.cpi_cfg.msg = NIC_MBOX_MSG_CPI_CFG; 318 mbx.cpi_cfg.vf_id = nic->vf_id; 319 mbx.cpi_cfg.cpi_alg = nic->cpi_alg; 320 mbx.cpi_cfg.rq_cnt = nic->qs->rq_cnt; 321 322 nicvf_send_msg_to_pf(nic, &mbx); 323 } 324 325 static void nicvf_get_rss_size(struct nicvf *nic) 326 { 327 union nic_mbx mbx = {}; 328 329 mbx.rss_size.msg = NIC_MBOX_MSG_RSS_SIZE; 330 mbx.rss_size.vf_id = nic->vf_id; 331 nicvf_send_msg_to_pf(nic, &mbx); 332 } 333 334 void nicvf_config_rss(struct nicvf *nic) 335 { 336 union nic_mbx mbx = {}; 337 struct nicvf_rss_info *rss = &nic->rss_info; 338 int ind_tbl_len = rss->rss_size; 339 int i, nextq = 0; 340 341 mbx.rss_cfg.vf_id = nic->vf_id; 342 mbx.rss_cfg.hash_bits = rss->hash_bits; 343 while (ind_tbl_len) { 344 mbx.rss_cfg.tbl_offset = nextq; 345 mbx.rss_cfg.tbl_len = min(ind_tbl_len, 346 RSS_IND_TBL_LEN_PER_MBX_MSG); 347 mbx.rss_cfg.msg = mbx.rss_cfg.tbl_offset ? 348 NIC_MBOX_MSG_RSS_CFG_CONT : NIC_MBOX_MSG_RSS_CFG; 349 350 for (i = 0; i < mbx.rss_cfg.tbl_len; i++) 351 mbx.rss_cfg.ind_tbl[i] = rss->ind_tbl[nextq++]; 352 353 nicvf_send_msg_to_pf(nic, &mbx); 354 355 ind_tbl_len -= mbx.rss_cfg.tbl_len; 356 } 357 } 358 359 void nicvf_set_rss_key(struct nicvf *nic) 360 { 361 struct nicvf_rss_info *rss = &nic->rss_info; 362 u64 key_addr = NIC_VNIC_RSS_KEY_0_4; 363 int idx; 364 365 for (idx = 0; idx < RSS_HASH_KEY_SIZE; idx++) { 366 nicvf_reg_write(nic, key_addr, rss->key[idx]); 367 key_addr += sizeof(u64); 368 } 369 } 370 371 static int nicvf_rss_init(struct nicvf *nic) 372 { 373 struct nicvf_rss_info *rss = &nic->rss_info; 374 int idx; 375 376 nicvf_get_rss_size(nic); 377 378 if (cpi_alg != CPI_ALG_NONE) { 379 rss->enable = false; 380 rss->hash_bits = 0; 381 return 0; 382 } 383 384 rss->enable = true; 385 386 netdev_rss_key_fill(rss->key, RSS_HASH_KEY_SIZE * sizeof(u64)); 387 nicvf_set_rss_key(nic); 388 389 rss->cfg = RSS_IP_HASH_ENA | RSS_TCP_HASH_ENA | RSS_UDP_HASH_ENA; 390 nicvf_reg_write(nic, NIC_VNIC_RSS_CFG, rss->cfg); 391 392 rss->hash_bits = ilog2(rounddown_pow_of_two(rss->rss_size)); 393 394 for (idx = 0; idx < rss->rss_size; idx++) 395 rss->ind_tbl[idx] = ethtool_rxfh_indir_default(idx, 396 nic->rx_queues); 397 nicvf_config_rss(nic); 398 return 1; 399 } 400 401 /* Request PF to allocate additional Qsets */ 402 static void nicvf_request_sqs(struct nicvf *nic) 403 { 404 union nic_mbx mbx = {}; 405 int sqs; 406 int sqs_count = nic->sqs_count; 407 int rx_queues = 0, tx_queues = 0; 408 409 /* Only primary VF should request */ 410 if (nic->sqs_mode || !nic->sqs_count) 411 return; 412 413 mbx.sqs_alloc.msg = NIC_MBOX_MSG_ALLOC_SQS; 414 mbx.sqs_alloc.vf_id = nic->vf_id; 415 mbx.sqs_alloc.qs_count = nic->sqs_count; 416 if (nicvf_send_msg_to_pf(nic, &mbx)) { 417 /* No response from PF */ 418 nic->sqs_count = 0; 419 return; 420 } 421 422 /* Return if no Secondary Qsets available */ 423 if (!nic->sqs_count) 424 return; 425 426 if (nic->rx_queues > MAX_RCV_QUEUES_PER_QS) 427 rx_queues = nic->rx_queues - MAX_RCV_QUEUES_PER_QS; 428 429 tx_queues = nic->tx_queues + nic->xdp_tx_queues; 430 if (tx_queues > MAX_SND_QUEUES_PER_QS) 431 tx_queues = tx_queues - MAX_SND_QUEUES_PER_QS; 432 433 /* Set no of Rx/Tx queues in each of the SQsets */ 434 for (sqs = 0; sqs < nic->sqs_count; sqs++) { 435 mbx.nicvf.msg = NIC_MBOX_MSG_SNICVF_PTR; 436 mbx.nicvf.vf_id = nic->vf_id; 437 mbx.nicvf.sqs_id = sqs; 438 nicvf_send_msg_to_pf(nic, &mbx); 439 440 nic->snicvf[sqs]->sqs_id = sqs; 441 if (rx_queues > MAX_RCV_QUEUES_PER_QS) { 442 nic->snicvf[sqs]->qs->rq_cnt = MAX_RCV_QUEUES_PER_QS; 443 rx_queues -= MAX_RCV_QUEUES_PER_QS; 444 } else { 445 nic->snicvf[sqs]->qs->rq_cnt = rx_queues; 446 rx_queues = 0; 447 } 448 449 if (tx_queues > MAX_SND_QUEUES_PER_QS) { 450 nic->snicvf[sqs]->qs->sq_cnt = MAX_SND_QUEUES_PER_QS; 451 tx_queues -= MAX_SND_QUEUES_PER_QS; 452 } else { 453 nic->snicvf[sqs]->qs->sq_cnt = tx_queues; 454 tx_queues = 0; 455 } 456 457 nic->snicvf[sqs]->qs->cq_cnt = 458 max(nic->snicvf[sqs]->qs->rq_cnt, nic->snicvf[sqs]->qs->sq_cnt); 459 460 /* Initialize secondary Qset's queues and its interrupts */ 461 nicvf_open(nic->snicvf[sqs]->netdev); 462 } 463 464 /* Update stack with actual Rx/Tx queue count allocated */ 465 if (sqs_count != nic->sqs_count) 466 nicvf_set_real_num_queues(nic->netdev, 467 nic->tx_queues, nic->rx_queues); 468 } 469 470 /* Send this Qset's nicvf pointer to PF. 471 * PF inturn sends primary VF's nicvf struct to secondary Qsets/VFs 472 * so that packets received by these Qsets can use primary VF's netdev 473 */ 474 static void nicvf_send_vf_struct(struct nicvf *nic) 475 { 476 union nic_mbx mbx = {}; 477 478 mbx.nicvf.msg = NIC_MBOX_MSG_NICVF_PTR; 479 mbx.nicvf.sqs_mode = nic->sqs_mode; 480 mbx.nicvf.nicvf = (u64)nic; 481 nicvf_send_msg_to_pf(nic, &mbx); 482 } 483 484 static void nicvf_get_primary_vf_struct(struct nicvf *nic) 485 { 486 union nic_mbx mbx = {}; 487 488 mbx.nicvf.msg = NIC_MBOX_MSG_PNICVF_PTR; 489 nicvf_send_msg_to_pf(nic, &mbx); 490 } 491 492 int nicvf_set_real_num_queues(struct net_device *netdev, 493 int tx_queues, int rx_queues) 494 { 495 int err = 0; 496 497 err = netif_set_real_num_tx_queues(netdev, tx_queues); 498 if (err) { 499 netdev_err(netdev, 500 "Failed to set no of Tx queues: %d\n", tx_queues); 501 return err; 502 } 503 504 err = netif_set_real_num_rx_queues(netdev, rx_queues); 505 if (err) 506 netdev_err(netdev, 507 "Failed to set no of Rx queues: %d\n", rx_queues); 508 return err; 509 } 510 511 static int nicvf_init_resources(struct nicvf *nic) 512 { 513 int err; 514 515 /* Enable Qset */ 516 nicvf_qset_config(nic, true); 517 518 /* Initialize queues and HW for data transfer */ 519 err = nicvf_config_data_transfer(nic, true); 520 if (err) { 521 netdev_err(nic->netdev, 522 "Failed to alloc/config VF's QSet resources\n"); 523 return err; 524 } 525 526 return 0; 527 } 528 529 static inline bool nicvf_xdp_rx(struct nicvf *nic, struct bpf_prog *prog, 530 struct cqe_rx_t *cqe_rx, struct snd_queue *sq, 531 struct rcv_queue *rq, struct sk_buff **skb) 532 { 533 struct xdp_buff xdp; 534 struct page *page; 535 u32 action; 536 u16 len, offset = 0; 537 u64 dma_addr, cpu_addr; 538 void *orig_data; 539 540 /* Retrieve packet buffer's DMA address and length */ 541 len = *((u16 *)((void *)cqe_rx + (3 * sizeof(u64)))); 542 dma_addr = *((u64 *)((void *)cqe_rx + (7 * sizeof(u64)))); 543 544 cpu_addr = nicvf_iova_to_phys(nic, dma_addr); 545 if (!cpu_addr) 546 return false; 547 cpu_addr = (u64)phys_to_virt(cpu_addr); 548 page = virt_to_page((void *)cpu_addr); 549 550 xdp.data_hard_start = page_address(page); 551 xdp.data = (void *)cpu_addr; 552 xdp_set_data_meta_invalid(&xdp); 553 xdp.data_end = xdp.data + len; 554 xdp.rxq = &rq->xdp_rxq; 555 xdp.frame_sz = RCV_FRAG_LEN + XDP_PACKET_HEADROOM; 556 orig_data = xdp.data; 557 558 rcu_read_lock(); 559 action = bpf_prog_run_xdp(prog, &xdp); 560 rcu_read_unlock(); 561 562 len = xdp.data_end - xdp.data; 563 /* Check if XDP program has changed headers */ 564 if (orig_data != xdp.data) { 565 offset = orig_data - xdp.data; 566 dma_addr -= offset; 567 } 568 569 switch (action) { 570 case XDP_PASS: 571 /* Check if it's a recycled page, if not 572 * unmap the DMA mapping. 573 * 574 * Recycled page holds an extra reference. 575 */ 576 if (page_ref_count(page) == 1) { 577 dma_addr &= PAGE_MASK; 578 dma_unmap_page_attrs(&nic->pdev->dev, dma_addr, 579 RCV_FRAG_LEN + XDP_PACKET_HEADROOM, 580 DMA_FROM_DEVICE, 581 DMA_ATTR_SKIP_CPU_SYNC); 582 } 583 584 /* Build SKB and pass on packet to network stack */ 585 *skb = build_skb(xdp.data, 586 RCV_FRAG_LEN - cqe_rx->align_pad + offset); 587 if (!*skb) 588 put_page(page); 589 else 590 skb_put(*skb, len); 591 return false; 592 case XDP_TX: 593 nicvf_xdp_sq_append_pkt(nic, sq, (u64)xdp.data, dma_addr, len); 594 return true; 595 default: 596 bpf_warn_invalid_xdp_action(action); 597 /* fall through */ 598 case XDP_ABORTED: 599 trace_xdp_exception(nic->netdev, prog, action); 600 /* fall through */ 601 case XDP_DROP: 602 /* Check if it's a recycled page, if not 603 * unmap the DMA mapping. 604 * 605 * Recycled page holds an extra reference. 606 */ 607 if (page_ref_count(page) == 1) { 608 dma_addr &= PAGE_MASK; 609 dma_unmap_page_attrs(&nic->pdev->dev, dma_addr, 610 RCV_FRAG_LEN + XDP_PACKET_HEADROOM, 611 DMA_FROM_DEVICE, 612 DMA_ATTR_SKIP_CPU_SYNC); 613 } 614 put_page(page); 615 return true; 616 } 617 return false; 618 } 619 620 static void nicvf_snd_ptp_handler(struct net_device *netdev, 621 struct cqe_send_t *cqe_tx) 622 { 623 struct nicvf *nic = netdev_priv(netdev); 624 struct skb_shared_hwtstamps ts; 625 u64 ns; 626 627 nic = nic->pnicvf; 628 629 /* Sync for 'ptp_skb' */ 630 smp_rmb(); 631 632 /* New timestamp request can be queued now */ 633 atomic_set(&nic->tx_ptp_skbs, 0); 634 635 /* Check for timestamp requested skb */ 636 if (!nic->ptp_skb) 637 return; 638 639 /* Check if timestamping is timedout, which is set to 10us */ 640 if (cqe_tx->send_status == CQ_TX_ERROP_TSTMP_TIMEOUT || 641 cqe_tx->send_status == CQ_TX_ERROP_TSTMP_CONFLICT) 642 goto no_tstamp; 643 644 /* Get the timestamp */ 645 memset(&ts, 0, sizeof(ts)); 646 ns = cavium_ptp_tstamp2time(nic->ptp_clock, cqe_tx->ptp_timestamp); 647 ts.hwtstamp = ns_to_ktime(ns); 648 skb_tstamp_tx(nic->ptp_skb, &ts); 649 650 no_tstamp: 651 /* Free the original skb */ 652 dev_kfree_skb_any(nic->ptp_skb); 653 nic->ptp_skb = NULL; 654 /* Sync 'ptp_skb' */ 655 smp_wmb(); 656 } 657 658 static void nicvf_snd_pkt_handler(struct net_device *netdev, 659 struct cqe_send_t *cqe_tx, 660 int budget, int *subdesc_cnt, 661 unsigned int *tx_pkts, unsigned int *tx_bytes) 662 { 663 struct sk_buff *skb = NULL; 664 struct page *page; 665 struct nicvf *nic = netdev_priv(netdev); 666 struct snd_queue *sq; 667 struct sq_hdr_subdesc *hdr; 668 struct sq_hdr_subdesc *tso_sqe; 669 670 sq = &nic->qs->sq[cqe_tx->sq_idx]; 671 672 hdr = (struct sq_hdr_subdesc *)GET_SQ_DESC(sq, cqe_tx->sqe_ptr); 673 if (hdr->subdesc_type != SQ_DESC_TYPE_HEADER) 674 return; 675 676 /* Check for errors */ 677 if (cqe_tx->send_status) 678 nicvf_check_cqe_tx_errs(nic->pnicvf, cqe_tx); 679 680 /* Is this a XDP designated Tx queue */ 681 if (sq->is_xdp) { 682 page = (struct page *)sq->xdp_page[cqe_tx->sqe_ptr]; 683 /* Check if it's recycled page or else unmap DMA mapping */ 684 if (page && (page_ref_count(page) == 1)) 685 nicvf_unmap_sndq_buffers(nic, sq, cqe_tx->sqe_ptr, 686 hdr->subdesc_cnt); 687 688 /* Release page reference for recycling */ 689 if (page) 690 put_page(page); 691 sq->xdp_page[cqe_tx->sqe_ptr] = (u64)NULL; 692 *subdesc_cnt += hdr->subdesc_cnt + 1; 693 return; 694 } 695 696 skb = (struct sk_buff *)sq->skbuff[cqe_tx->sqe_ptr]; 697 if (skb) { 698 /* Check for dummy descriptor used for HW TSO offload on 88xx */ 699 if (hdr->dont_send) { 700 /* Get actual TSO descriptors and free them */ 701 tso_sqe = 702 (struct sq_hdr_subdesc *)GET_SQ_DESC(sq, hdr->rsvd2); 703 nicvf_unmap_sndq_buffers(nic, sq, hdr->rsvd2, 704 tso_sqe->subdesc_cnt); 705 *subdesc_cnt += tso_sqe->subdesc_cnt + 1; 706 } else { 707 nicvf_unmap_sndq_buffers(nic, sq, cqe_tx->sqe_ptr, 708 hdr->subdesc_cnt); 709 } 710 *subdesc_cnt += hdr->subdesc_cnt + 1; 711 prefetch(skb); 712 (*tx_pkts)++; 713 *tx_bytes += skb->len; 714 /* If timestamp is requested for this skb, don't free it */ 715 if (skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS && 716 !nic->pnicvf->ptp_skb) 717 nic->pnicvf->ptp_skb = skb; 718 else 719 napi_consume_skb(skb, budget); 720 sq->skbuff[cqe_tx->sqe_ptr] = (u64)NULL; 721 } else { 722 /* In case of SW TSO on 88xx, only last segment will have 723 * a SKB attached, so just free SQEs here. 724 */ 725 if (!nic->hw_tso) 726 *subdesc_cnt += hdr->subdesc_cnt + 1; 727 } 728 } 729 730 static inline void nicvf_set_rxhash(struct net_device *netdev, 731 struct cqe_rx_t *cqe_rx, 732 struct sk_buff *skb) 733 { 734 u8 hash_type; 735 u32 hash; 736 737 if (!(netdev->features & NETIF_F_RXHASH)) 738 return; 739 740 switch (cqe_rx->rss_alg) { 741 case RSS_ALG_TCP_IP: 742 case RSS_ALG_UDP_IP: 743 hash_type = PKT_HASH_TYPE_L4; 744 hash = cqe_rx->rss_tag; 745 break; 746 case RSS_ALG_IP: 747 hash_type = PKT_HASH_TYPE_L3; 748 hash = cqe_rx->rss_tag; 749 break; 750 default: 751 hash_type = PKT_HASH_TYPE_NONE; 752 hash = 0; 753 } 754 755 skb_set_hash(skb, hash, hash_type); 756 } 757 758 static inline void nicvf_set_rxtstamp(struct nicvf *nic, struct sk_buff *skb) 759 { 760 u64 ns; 761 762 if (!nic->ptp_clock || !nic->hw_rx_tstamp) 763 return; 764 765 /* The first 8 bytes is the timestamp */ 766 ns = cavium_ptp_tstamp2time(nic->ptp_clock, 767 be64_to_cpu(*(__be64 *)skb->data)); 768 skb_hwtstamps(skb)->hwtstamp = ns_to_ktime(ns); 769 770 __skb_pull(skb, 8); 771 } 772 773 static void nicvf_rcv_pkt_handler(struct net_device *netdev, 774 struct napi_struct *napi, 775 struct cqe_rx_t *cqe_rx, 776 struct snd_queue *sq, struct rcv_queue *rq) 777 { 778 struct sk_buff *skb = NULL; 779 struct nicvf *nic = netdev_priv(netdev); 780 struct nicvf *snic = nic; 781 int err = 0; 782 int rq_idx; 783 784 rq_idx = nicvf_netdev_qidx(nic, cqe_rx->rq_idx); 785 786 if (nic->sqs_mode) { 787 /* Use primary VF's 'nicvf' struct */ 788 nic = nic->pnicvf; 789 netdev = nic->netdev; 790 } 791 792 /* Check for errors */ 793 if (cqe_rx->err_level || cqe_rx->err_opcode) { 794 err = nicvf_check_cqe_rx_errs(nic, cqe_rx); 795 if (err && !cqe_rx->rb_cnt) 796 return; 797 } 798 799 /* For XDP, ignore pkts spanning multiple pages */ 800 if (nic->xdp_prog && (cqe_rx->rb_cnt == 1)) { 801 /* Packet consumed by XDP */ 802 if (nicvf_xdp_rx(snic, nic->xdp_prog, cqe_rx, sq, rq, &skb)) 803 return; 804 } else { 805 skb = nicvf_get_rcv_skb(snic, cqe_rx, 806 nic->xdp_prog ? true : false); 807 } 808 809 if (!skb) 810 return; 811 812 if (netif_msg_pktdata(nic)) { 813 netdev_info(nic->netdev, "skb 0x%p, len=%d\n", skb, skb->len); 814 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 16, 1, 815 skb->data, skb->len, true); 816 } 817 818 /* If error packet, drop it here */ 819 if (err) { 820 dev_kfree_skb_any(skb); 821 return; 822 } 823 824 nicvf_set_rxtstamp(nic, skb); 825 nicvf_set_rxhash(netdev, cqe_rx, skb); 826 827 skb_record_rx_queue(skb, rq_idx); 828 if (netdev->hw_features & NETIF_F_RXCSUM) { 829 /* HW by default verifies TCP/UDP/SCTP checksums */ 830 skb->ip_summed = CHECKSUM_UNNECESSARY; 831 } else { 832 skb_checksum_none_assert(skb); 833 } 834 835 skb->protocol = eth_type_trans(skb, netdev); 836 837 /* Check for stripped VLAN */ 838 if (cqe_rx->vlan_found && cqe_rx->vlan_stripped) 839 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), 840 ntohs((__force __be16)cqe_rx->vlan_tci)); 841 842 if (napi && (netdev->features & NETIF_F_GRO)) 843 napi_gro_receive(napi, skb); 844 else 845 netif_receive_skb(skb); 846 } 847 848 static int nicvf_cq_intr_handler(struct net_device *netdev, u8 cq_idx, 849 struct napi_struct *napi, int budget) 850 { 851 int processed_cqe, work_done = 0, tx_done = 0; 852 int cqe_count, cqe_head; 853 int subdesc_cnt = 0; 854 struct nicvf *nic = netdev_priv(netdev); 855 struct queue_set *qs = nic->qs; 856 struct cmp_queue *cq = &qs->cq[cq_idx]; 857 struct cqe_rx_t *cq_desc; 858 struct netdev_queue *txq; 859 struct snd_queue *sq = &qs->sq[cq_idx]; 860 struct rcv_queue *rq = &qs->rq[cq_idx]; 861 unsigned int tx_pkts = 0, tx_bytes = 0, txq_idx; 862 863 spin_lock_bh(&cq->lock); 864 loop: 865 processed_cqe = 0; 866 /* Get no of valid CQ entries to process */ 867 cqe_count = nicvf_queue_reg_read(nic, NIC_QSET_CQ_0_7_STATUS, cq_idx); 868 cqe_count &= CQ_CQE_COUNT; 869 if (!cqe_count) 870 goto done; 871 872 /* Get head of the valid CQ entries */ 873 cqe_head = nicvf_queue_reg_read(nic, NIC_QSET_CQ_0_7_HEAD, cq_idx) >> 9; 874 cqe_head &= 0xFFFF; 875 876 while (processed_cqe < cqe_count) { 877 /* Get the CQ descriptor */ 878 cq_desc = (struct cqe_rx_t *)GET_CQ_DESC(cq, cqe_head); 879 cqe_head++; 880 cqe_head &= (cq->dmem.q_len - 1); 881 /* Initiate prefetch for next descriptor */ 882 prefetch((struct cqe_rx_t *)GET_CQ_DESC(cq, cqe_head)); 883 884 if ((work_done >= budget) && napi && 885 (cq_desc->cqe_type != CQE_TYPE_SEND)) { 886 break; 887 } 888 889 switch (cq_desc->cqe_type) { 890 case CQE_TYPE_RX: 891 nicvf_rcv_pkt_handler(netdev, napi, cq_desc, sq, rq); 892 work_done++; 893 break; 894 case CQE_TYPE_SEND: 895 nicvf_snd_pkt_handler(netdev, (void *)cq_desc, 896 budget, &subdesc_cnt, 897 &tx_pkts, &tx_bytes); 898 tx_done++; 899 break; 900 case CQE_TYPE_SEND_PTP: 901 nicvf_snd_ptp_handler(netdev, (void *)cq_desc); 902 break; 903 case CQE_TYPE_INVALID: 904 case CQE_TYPE_RX_SPLIT: 905 case CQE_TYPE_RX_TCP: 906 /* Ignore for now */ 907 break; 908 } 909 processed_cqe++; 910 } 911 912 /* Ring doorbell to inform H/W to reuse processed CQEs */ 913 nicvf_queue_reg_write(nic, NIC_QSET_CQ_0_7_DOOR, 914 cq_idx, processed_cqe); 915 916 if ((work_done < budget) && napi) 917 goto loop; 918 919 done: 920 /* Update SQ's descriptor free count */ 921 if (subdesc_cnt) 922 nicvf_put_sq_desc(sq, subdesc_cnt); 923 924 txq_idx = nicvf_netdev_qidx(nic, cq_idx); 925 /* Handle XDP TX queues */ 926 if (nic->pnicvf->xdp_prog) { 927 if (txq_idx < nic->pnicvf->xdp_tx_queues) { 928 nicvf_xdp_sq_doorbell(nic, sq, cq_idx); 929 goto out; 930 } 931 nic = nic->pnicvf; 932 txq_idx -= nic->pnicvf->xdp_tx_queues; 933 } 934 935 /* Wakeup TXQ if its stopped earlier due to SQ full */ 936 if (tx_done || 937 (atomic_read(&sq->free_cnt) >= MIN_SQ_DESC_PER_PKT_XMIT)) { 938 netdev = nic->pnicvf->netdev; 939 txq = netdev_get_tx_queue(netdev, txq_idx); 940 if (tx_pkts) 941 netdev_tx_completed_queue(txq, tx_pkts, tx_bytes); 942 943 /* To read updated queue and carrier status */ 944 smp_mb(); 945 if (netif_tx_queue_stopped(txq) && netif_carrier_ok(netdev)) { 946 netif_tx_wake_queue(txq); 947 nic = nic->pnicvf; 948 this_cpu_inc(nic->drv_stats->txq_wake); 949 netif_warn(nic, tx_err, netdev, 950 "Transmit queue wakeup SQ%d\n", txq_idx); 951 } 952 } 953 954 out: 955 spin_unlock_bh(&cq->lock); 956 return work_done; 957 } 958 959 static int nicvf_poll(struct napi_struct *napi, int budget) 960 { 961 u64 cq_head; 962 int work_done = 0; 963 struct net_device *netdev = napi->dev; 964 struct nicvf *nic = netdev_priv(netdev); 965 struct nicvf_cq_poll *cq; 966 967 cq = container_of(napi, struct nicvf_cq_poll, napi); 968 work_done = nicvf_cq_intr_handler(netdev, cq->cq_idx, napi, budget); 969 970 if (work_done < budget) { 971 /* Slow packet rate, exit polling */ 972 napi_complete_done(napi, work_done); 973 /* Re-enable interrupts */ 974 cq_head = nicvf_queue_reg_read(nic, NIC_QSET_CQ_0_7_HEAD, 975 cq->cq_idx); 976 nicvf_clear_intr(nic, NICVF_INTR_CQ, cq->cq_idx); 977 nicvf_queue_reg_write(nic, NIC_QSET_CQ_0_7_HEAD, 978 cq->cq_idx, cq_head); 979 nicvf_enable_intr(nic, NICVF_INTR_CQ, cq->cq_idx); 980 } 981 return work_done; 982 } 983 984 /* Qset error interrupt handler 985 * 986 * As of now only CQ errors are handled 987 */ 988 static void nicvf_handle_qs_err(unsigned long data) 989 { 990 struct nicvf *nic = (struct nicvf *)data; 991 struct queue_set *qs = nic->qs; 992 int qidx; 993 u64 status; 994 995 netif_tx_disable(nic->netdev); 996 997 /* Check if it is CQ err */ 998 for (qidx = 0; qidx < qs->cq_cnt; qidx++) { 999 status = nicvf_queue_reg_read(nic, NIC_QSET_CQ_0_7_STATUS, 1000 qidx); 1001 if (!(status & CQ_ERR_MASK)) 1002 continue; 1003 /* Process already queued CQEs and reconfig CQ */ 1004 nicvf_disable_intr(nic, NICVF_INTR_CQ, qidx); 1005 nicvf_sq_disable(nic, qidx); 1006 nicvf_cq_intr_handler(nic->netdev, qidx, NULL, 0); 1007 nicvf_cmp_queue_config(nic, qs, qidx, true); 1008 nicvf_sq_free_used_descs(nic->netdev, &qs->sq[qidx], qidx); 1009 nicvf_sq_enable(nic, &qs->sq[qidx], qidx); 1010 1011 nicvf_enable_intr(nic, NICVF_INTR_CQ, qidx); 1012 } 1013 1014 netif_tx_start_all_queues(nic->netdev); 1015 /* Re-enable Qset error interrupt */ 1016 nicvf_enable_intr(nic, NICVF_INTR_QS_ERR, 0); 1017 } 1018 1019 static void nicvf_dump_intr_status(struct nicvf *nic) 1020 { 1021 netif_info(nic, intr, nic->netdev, "interrupt status 0x%llx\n", 1022 nicvf_reg_read(nic, NIC_VF_INT)); 1023 } 1024 1025 static irqreturn_t nicvf_misc_intr_handler(int irq, void *nicvf_irq) 1026 { 1027 struct nicvf *nic = (struct nicvf *)nicvf_irq; 1028 u64 intr; 1029 1030 nicvf_dump_intr_status(nic); 1031 1032 intr = nicvf_reg_read(nic, NIC_VF_INT); 1033 /* Check for spurious interrupt */ 1034 if (!(intr & NICVF_INTR_MBOX_MASK)) 1035 return IRQ_HANDLED; 1036 1037 nicvf_handle_mbx_intr(nic); 1038 1039 return IRQ_HANDLED; 1040 } 1041 1042 static irqreturn_t nicvf_intr_handler(int irq, void *cq_irq) 1043 { 1044 struct nicvf_cq_poll *cq_poll = (struct nicvf_cq_poll *)cq_irq; 1045 struct nicvf *nic = cq_poll->nicvf; 1046 int qidx = cq_poll->cq_idx; 1047 1048 nicvf_dump_intr_status(nic); 1049 1050 /* Disable interrupts */ 1051 nicvf_disable_intr(nic, NICVF_INTR_CQ, qidx); 1052 1053 /* Schedule NAPI */ 1054 napi_schedule_irqoff(&cq_poll->napi); 1055 1056 /* Clear interrupt */ 1057 nicvf_clear_intr(nic, NICVF_INTR_CQ, qidx); 1058 1059 return IRQ_HANDLED; 1060 } 1061 1062 static irqreturn_t nicvf_rbdr_intr_handler(int irq, void *nicvf_irq) 1063 { 1064 struct nicvf *nic = (struct nicvf *)nicvf_irq; 1065 u8 qidx; 1066 1067 1068 nicvf_dump_intr_status(nic); 1069 1070 /* Disable RBDR interrupt and schedule softirq */ 1071 for (qidx = 0; qidx < nic->qs->rbdr_cnt; qidx++) { 1072 if (!nicvf_is_intr_enabled(nic, NICVF_INTR_RBDR, qidx)) 1073 continue; 1074 nicvf_disable_intr(nic, NICVF_INTR_RBDR, qidx); 1075 tasklet_hi_schedule(&nic->rbdr_task); 1076 /* Clear interrupt */ 1077 nicvf_clear_intr(nic, NICVF_INTR_RBDR, qidx); 1078 } 1079 1080 return IRQ_HANDLED; 1081 } 1082 1083 static irqreturn_t nicvf_qs_err_intr_handler(int irq, void *nicvf_irq) 1084 { 1085 struct nicvf *nic = (struct nicvf *)nicvf_irq; 1086 1087 nicvf_dump_intr_status(nic); 1088 1089 /* Disable Qset err interrupt and schedule softirq */ 1090 nicvf_disable_intr(nic, NICVF_INTR_QS_ERR, 0); 1091 tasklet_hi_schedule(&nic->qs_err_task); 1092 nicvf_clear_intr(nic, NICVF_INTR_QS_ERR, 0); 1093 1094 return IRQ_HANDLED; 1095 } 1096 1097 static void nicvf_set_irq_affinity(struct nicvf *nic) 1098 { 1099 int vec, cpu; 1100 1101 for (vec = 0; vec < nic->num_vec; vec++) { 1102 if (!nic->irq_allocated[vec]) 1103 continue; 1104 1105 if (!zalloc_cpumask_var(&nic->affinity_mask[vec], GFP_KERNEL)) 1106 return; 1107 /* CQ interrupts */ 1108 if (vec < NICVF_INTR_ID_SQ) 1109 /* Leave CPU0 for RBDR and other interrupts */ 1110 cpu = nicvf_netdev_qidx(nic, vec) + 1; 1111 else 1112 cpu = 0; 1113 1114 cpumask_set_cpu(cpumask_local_spread(cpu, nic->node), 1115 nic->affinity_mask[vec]); 1116 irq_set_affinity_hint(pci_irq_vector(nic->pdev, vec), 1117 nic->affinity_mask[vec]); 1118 } 1119 } 1120 1121 static int nicvf_register_interrupts(struct nicvf *nic) 1122 { 1123 int irq, ret = 0; 1124 1125 for_each_cq_irq(irq) 1126 sprintf(nic->irq_name[irq], "%s-rxtx-%d", 1127 nic->pnicvf->netdev->name, 1128 nicvf_netdev_qidx(nic, irq)); 1129 1130 for_each_sq_irq(irq) 1131 sprintf(nic->irq_name[irq], "%s-sq-%d", 1132 nic->pnicvf->netdev->name, 1133 nicvf_netdev_qidx(nic, irq - NICVF_INTR_ID_SQ)); 1134 1135 for_each_rbdr_irq(irq) 1136 sprintf(nic->irq_name[irq], "%s-rbdr-%d", 1137 nic->pnicvf->netdev->name, 1138 nic->sqs_mode ? (nic->sqs_id + 1) : 0); 1139 1140 /* Register CQ interrupts */ 1141 for (irq = 0; irq < nic->qs->cq_cnt; irq++) { 1142 ret = request_irq(pci_irq_vector(nic->pdev, irq), 1143 nicvf_intr_handler, 1144 0, nic->irq_name[irq], nic->napi[irq]); 1145 if (ret) 1146 goto err; 1147 nic->irq_allocated[irq] = true; 1148 } 1149 1150 /* Register RBDR interrupt */ 1151 for (irq = NICVF_INTR_ID_RBDR; 1152 irq < (NICVF_INTR_ID_RBDR + nic->qs->rbdr_cnt); irq++) { 1153 ret = request_irq(pci_irq_vector(nic->pdev, irq), 1154 nicvf_rbdr_intr_handler, 1155 0, nic->irq_name[irq], nic); 1156 if (ret) 1157 goto err; 1158 nic->irq_allocated[irq] = true; 1159 } 1160 1161 /* Register QS error interrupt */ 1162 sprintf(nic->irq_name[NICVF_INTR_ID_QS_ERR], "%s-qset-err-%d", 1163 nic->pnicvf->netdev->name, 1164 nic->sqs_mode ? (nic->sqs_id + 1) : 0); 1165 irq = NICVF_INTR_ID_QS_ERR; 1166 ret = request_irq(pci_irq_vector(nic->pdev, irq), 1167 nicvf_qs_err_intr_handler, 1168 0, nic->irq_name[irq], nic); 1169 if (ret) 1170 goto err; 1171 1172 nic->irq_allocated[irq] = true; 1173 1174 /* Set IRQ affinities */ 1175 nicvf_set_irq_affinity(nic); 1176 1177 err: 1178 if (ret) 1179 netdev_err(nic->netdev, "request_irq failed, vector %d\n", irq); 1180 1181 return ret; 1182 } 1183 1184 static void nicvf_unregister_interrupts(struct nicvf *nic) 1185 { 1186 struct pci_dev *pdev = nic->pdev; 1187 int irq; 1188 1189 /* Free registered interrupts */ 1190 for (irq = 0; irq < nic->num_vec; irq++) { 1191 if (!nic->irq_allocated[irq]) 1192 continue; 1193 1194 irq_set_affinity_hint(pci_irq_vector(pdev, irq), NULL); 1195 free_cpumask_var(nic->affinity_mask[irq]); 1196 1197 if (irq < NICVF_INTR_ID_SQ) 1198 free_irq(pci_irq_vector(pdev, irq), nic->napi[irq]); 1199 else 1200 free_irq(pci_irq_vector(pdev, irq), nic); 1201 1202 nic->irq_allocated[irq] = false; 1203 } 1204 1205 /* Disable MSI-X */ 1206 pci_free_irq_vectors(pdev); 1207 nic->num_vec = 0; 1208 } 1209 1210 /* Initialize MSIX vectors and register MISC interrupt. 1211 * Send READY message to PF to check if its alive 1212 */ 1213 static int nicvf_register_misc_interrupt(struct nicvf *nic) 1214 { 1215 int ret = 0; 1216 int irq = NICVF_INTR_ID_MISC; 1217 1218 /* Return if mailbox interrupt is already registered */ 1219 if (nic->pdev->msix_enabled) 1220 return 0; 1221 1222 /* Enable MSI-X */ 1223 nic->num_vec = pci_msix_vec_count(nic->pdev); 1224 ret = pci_alloc_irq_vectors(nic->pdev, nic->num_vec, nic->num_vec, 1225 PCI_IRQ_MSIX); 1226 if (ret < 0) { 1227 netdev_err(nic->netdev, 1228 "Req for #%d msix vectors failed\n", nic->num_vec); 1229 return 1; 1230 } 1231 1232 sprintf(nic->irq_name[irq], "%s Mbox", "NICVF"); 1233 /* Register Misc interrupt */ 1234 ret = request_irq(pci_irq_vector(nic->pdev, irq), 1235 nicvf_misc_intr_handler, 0, nic->irq_name[irq], nic); 1236 1237 if (ret) 1238 return ret; 1239 nic->irq_allocated[irq] = true; 1240 1241 /* Enable mailbox interrupt */ 1242 nicvf_enable_intr(nic, NICVF_INTR_MBOX, 0); 1243 1244 /* Check if VF is able to communicate with PF */ 1245 if (!nicvf_check_pf_ready(nic)) { 1246 nicvf_disable_intr(nic, NICVF_INTR_MBOX, 0); 1247 nicvf_unregister_interrupts(nic); 1248 return 1; 1249 } 1250 1251 return 0; 1252 } 1253 1254 static netdev_tx_t nicvf_xmit(struct sk_buff *skb, struct net_device *netdev) 1255 { 1256 struct nicvf *nic = netdev_priv(netdev); 1257 int qid = skb_get_queue_mapping(skb); 1258 struct netdev_queue *txq = netdev_get_tx_queue(netdev, qid); 1259 struct nicvf *snic; 1260 struct snd_queue *sq; 1261 int tmp; 1262 1263 /* Check for minimum packet length */ 1264 if (skb->len <= ETH_HLEN) { 1265 dev_kfree_skb(skb); 1266 return NETDEV_TX_OK; 1267 } 1268 1269 /* In XDP case, initial HW tx queues are used for XDP, 1270 * but stack's queue mapping starts at '0', so skip the 1271 * Tx queues attached to Rx queues for XDP. 1272 */ 1273 if (nic->xdp_prog) 1274 qid += nic->xdp_tx_queues; 1275 1276 snic = nic; 1277 /* Get secondary Qset's SQ structure */ 1278 if (qid >= MAX_SND_QUEUES_PER_QS) { 1279 tmp = qid / MAX_SND_QUEUES_PER_QS; 1280 snic = (struct nicvf *)nic->snicvf[tmp - 1]; 1281 if (!snic) { 1282 netdev_warn(nic->netdev, 1283 "Secondary Qset#%d's ptr not initialized\n", 1284 tmp - 1); 1285 dev_kfree_skb(skb); 1286 return NETDEV_TX_OK; 1287 } 1288 qid = qid % MAX_SND_QUEUES_PER_QS; 1289 } 1290 1291 sq = &snic->qs->sq[qid]; 1292 if (!netif_tx_queue_stopped(txq) && 1293 !nicvf_sq_append_skb(snic, sq, skb, qid)) { 1294 netif_tx_stop_queue(txq); 1295 1296 /* Barrier, so that stop_queue visible to other cpus */ 1297 smp_mb(); 1298 1299 /* Check again, incase another cpu freed descriptors */ 1300 if (atomic_read(&sq->free_cnt) > MIN_SQ_DESC_PER_PKT_XMIT) { 1301 netif_tx_wake_queue(txq); 1302 } else { 1303 this_cpu_inc(nic->drv_stats->txq_stop); 1304 netif_warn(nic, tx_err, netdev, 1305 "Transmit ring full, stopping SQ%d\n", qid); 1306 } 1307 return NETDEV_TX_BUSY; 1308 } 1309 1310 return NETDEV_TX_OK; 1311 } 1312 1313 static inline void nicvf_free_cq_poll(struct nicvf *nic) 1314 { 1315 struct nicvf_cq_poll *cq_poll; 1316 int qidx; 1317 1318 for (qidx = 0; qidx < nic->qs->cq_cnt; qidx++) { 1319 cq_poll = nic->napi[qidx]; 1320 if (!cq_poll) 1321 continue; 1322 nic->napi[qidx] = NULL; 1323 kfree(cq_poll); 1324 } 1325 } 1326 1327 int nicvf_stop(struct net_device *netdev) 1328 { 1329 int irq, qidx; 1330 struct nicvf *nic = netdev_priv(netdev); 1331 struct queue_set *qs = nic->qs; 1332 struct nicvf_cq_poll *cq_poll = NULL; 1333 union nic_mbx mbx = {}; 1334 1335 /* wait till all queued set_rx_mode tasks completes */ 1336 if (nic->nicvf_rx_mode_wq) { 1337 cancel_delayed_work_sync(&nic->link_change_work); 1338 drain_workqueue(nic->nicvf_rx_mode_wq); 1339 } 1340 1341 mbx.msg.msg = NIC_MBOX_MSG_SHUTDOWN; 1342 nicvf_send_msg_to_pf(nic, &mbx); 1343 1344 netif_carrier_off(netdev); 1345 netif_tx_stop_all_queues(nic->netdev); 1346 nic->link_up = false; 1347 1348 /* Teardown secondary qsets first */ 1349 if (!nic->sqs_mode) { 1350 for (qidx = 0; qidx < nic->sqs_count; qidx++) { 1351 if (!nic->snicvf[qidx]) 1352 continue; 1353 nicvf_stop(nic->snicvf[qidx]->netdev); 1354 nic->snicvf[qidx] = NULL; 1355 } 1356 } 1357 1358 /* Disable RBDR & QS error interrupts */ 1359 for (qidx = 0; qidx < qs->rbdr_cnt; qidx++) { 1360 nicvf_disable_intr(nic, NICVF_INTR_RBDR, qidx); 1361 nicvf_clear_intr(nic, NICVF_INTR_RBDR, qidx); 1362 } 1363 nicvf_disable_intr(nic, NICVF_INTR_QS_ERR, 0); 1364 nicvf_clear_intr(nic, NICVF_INTR_QS_ERR, 0); 1365 1366 /* Wait for pending IRQ handlers to finish */ 1367 for (irq = 0; irq < nic->num_vec; irq++) 1368 synchronize_irq(pci_irq_vector(nic->pdev, irq)); 1369 1370 tasklet_kill(&nic->rbdr_task); 1371 tasklet_kill(&nic->qs_err_task); 1372 if (nic->rb_work_scheduled) 1373 cancel_delayed_work_sync(&nic->rbdr_work); 1374 1375 for (qidx = 0; qidx < nic->qs->cq_cnt; qidx++) { 1376 cq_poll = nic->napi[qidx]; 1377 if (!cq_poll) 1378 continue; 1379 napi_synchronize(&cq_poll->napi); 1380 /* CQ intr is enabled while napi_complete, 1381 * so disable it now 1382 */ 1383 nicvf_disable_intr(nic, NICVF_INTR_CQ, qidx); 1384 nicvf_clear_intr(nic, NICVF_INTR_CQ, qidx); 1385 napi_disable(&cq_poll->napi); 1386 netif_napi_del(&cq_poll->napi); 1387 } 1388 1389 netif_tx_disable(netdev); 1390 1391 for (qidx = 0; qidx < netdev->num_tx_queues; qidx++) 1392 netdev_tx_reset_queue(netdev_get_tx_queue(netdev, qidx)); 1393 1394 /* Free resources */ 1395 nicvf_config_data_transfer(nic, false); 1396 1397 /* Disable HW Qset */ 1398 nicvf_qset_config(nic, false); 1399 1400 /* disable mailbox interrupt */ 1401 nicvf_disable_intr(nic, NICVF_INTR_MBOX, 0); 1402 1403 nicvf_unregister_interrupts(nic); 1404 1405 nicvf_free_cq_poll(nic); 1406 1407 /* Free any pending SKB saved to receive timestamp */ 1408 if (nic->ptp_skb) { 1409 dev_kfree_skb_any(nic->ptp_skb); 1410 nic->ptp_skb = NULL; 1411 } 1412 1413 /* Clear multiqset info */ 1414 nic->pnicvf = nic; 1415 1416 return 0; 1417 } 1418 1419 static int nicvf_config_hw_rx_tstamp(struct nicvf *nic, bool enable) 1420 { 1421 union nic_mbx mbx = {}; 1422 1423 mbx.ptp.msg = NIC_MBOX_MSG_PTP_CFG; 1424 mbx.ptp.enable = enable; 1425 1426 return nicvf_send_msg_to_pf(nic, &mbx); 1427 } 1428 1429 static int nicvf_update_hw_max_frs(struct nicvf *nic, int mtu) 1430 { 1431 union nic_mbx mbx = {}; 1432 1433 mbx.frs.msg = NIC_MBOX_MSG_SET_MAX_FRS; 1434 mbx.frs.max_frs = mtu; 1435 mbx.frs.vf_id = nic->vf_id; 1436 1437 return nicvf_send_msg_to_pf(nic, &mbx); 1438 } 1439 1440 static void nicvf_link_status_check_task(struct work_struct *work_arg) 1441 { 1442 struct nicvf *nic = container_of(work_arg, 1443 struct nicvf, 1444 link_change_work.work); 1445 union nic_mbx mbx = {}; 1446 mbx.msg.msg = NIC_MBOX_MSG_BGX_LINK_CHANGE; 1447 nicvf_send_msg_to_pf(nic, &mbx); 1448 queue_delayed_work(nic->nicvf_rx_mode_wq, 1449 &nic->link_change_work, 2 * HZ); 1450 } 1451 1452 int nicvf_open(struct net_device *netdev) 1453 { 1454 int cpu, err, qidx; 1455 struct nicvf *nic = netdev_priv(netdev); 1456 struct queue_set *qs = nic->qs; 1457 struct nicvf_cq_poll *cq_poll = NULL; 1458 1459 /* wait till all queued set_rx_mode tasks completes if any */ 1460 if (nic->nicvf_rx_mode_wq) 1461 drain_workqueue(nic->nicvf_rx_mode_wq); 1462 1463 netif_carrier_off(netdev); 1464 1465 err = nicvf_register_misc_interrupt(nic); 1466 if (err) 1467 return err; 1468 1469 /* Register NAPI handler for processing CQEs */ 1470 for (qidx = 0; qidx < qs->cq_cnt; qidx++) { 1471 cq_poll = kzalloc(sizeof(*cq_poll), GFP_KERNEL); 1472 if (!cq_poll) { 1473 err = -ENOMEM; 1474 goto napi_del; 1475 } 1476 cq_poll->cq_idx = qidx; 1477 cq_poll->nicvf = nic; 1478 netif_napi_add(netdev, &cq_poll->napi, nicvf_poll, 1479 NAPI_POLL_WEIGHT); 1480 napi_enable(&cq_poll->napi); 1481 nic->napi[qidx] = cq_poll; 1482 } 1483 1484 /* Check if we got MAC address from PF or else generate a radom MAC */ 1485 if (!nic->sqs_mode && is_zero_ether_addr(netdev->dev_addr)) { 1486 eth_hw_addr_random(netdev); 1487 nicvf_hw_set_mac_addr(nic, netdev); 1488 } 1489 1490 if (nic->set_mac_pending) { 1491 nic->set_mac_pending = false; 1492 nicvf_hw_set_mac_addr(nic, netdev); 1493 } 1494 1495 /* Init tasklet for handling Qset err interrupt */ 1496 tasklet_init(&nic->qs_err_task, nicvf_handle_qs_err, 1497 (unsigned long)nic); 1498 1499 /* Init RBDR tasklet which will refill RBDR */ 1500 tasklet_init(&nic->rbdr_task, nicvf_rbdr_task, 1501 (unsigned long)nic); 1502 INIT_DELAYED_WORK(&nic->rbdr_work, nicvf_rbdr_work); 1503 1504 /* Configure CPI alorithm */ 1505 nic->cpi_alg = cpi_alg; 1506 if (!nic->sqs_mode) 1507 nicvf_config_cpi(nic); 1508 1509 nicvf_request_sqs(nic); 1510 if (nic->sqs_mode) 1511 nicvf_get_primary_vf_struct(nic); 1512 1513 /* Configure PTP timestamp */ 1514 if (nic->ptp_clock) 1515 nicvf_config_hw_rx_tstamp(nic, nic->hw_rx_tstamp); 1516 atomic_set(&nic->tx_ptp_skbs, 0); 1517 nic->ptp_skb = NULL; 1518 1519 /* Configure receive side scaling and MTU */ 1520 if (!nic->sqs_mode) { 1521 nicvf_rss_init(nic); 1522 err = nicvf_update_hw_max_frs(nic, netdev->mtu); 1523 if (err) 1524 goto cleanup; 1525 1526 /* Clear percpu stats */ 1527 for_each_possible_cpu(cpu) 1528 memset(per_cpu_ptr(nic->drv_stats, cpu), 0, 1529 sizeof(struct nicvf_drv_stats)); 1530 } 1531 1532 err = nicvf_register_interrupts(nic); 1533 if (err) 1534 goto cleanup; 1535 1536 /* Initialize the queues */ 1537 err = nicvf_init_resources(nic); 1538 if (err) 1539 goto cleanup; 1540 1541 /* Make sure queue initialization is written */ 1542 wmb(); 1543 1544 nicvf_reg_write(nic, NIC_VF_INT, -1); 1545 /* Enable Qset err interrupt */ 1546 nicvf_enable_intr(nic, NICVF_INTR_QS_ERR, 0); 1547 1548 /* Enable completion queue interrupt */ 1549 for (qidx = 0; qidx < qs->cq_cnt; qidx++) 1550 nicvf_enable_intr(nic, NICVF_INTR_CQ, qidx); 1551 1552 /* Enable RBDR threshold interrupt */ 1553 for (qidx = 0; qidx < qs->rbdr_cnt; qidx++) 1554 nicvf_enable_intr(nic, NICVF_INTR_RBDR, qidx); 1555 1556 /* Send VF config done msg to PF */ 1557 nicvf_send_cfg_done(nic); 1558 1559 if (nic->nicvf_rx_mode_wq) { 1560 INIT_DELAYED_WORK(&nic->link_change_work, 1561 nicvf_link_status_check_task); 1562 queue_delayed_work(nic->nicvf_rx_mode_wq, 1563 &nic->link_change_work, 0); 1564 } 1565 1566 return 0; 1567 cleanup: 1568 nicvf_disable_intr(nic, NICVF_INTR_MBOX, 0); 1569 nicvf_unregister_interrupts(nic); 1570 tasklet_kill(&nic->qs_err_task); 1571 tasklet_kill(&nic->rbdr_task); 1572 napi_del: 1573 for (qidx = 0; qidx < qs->cq_cnt; qidx++) { 1574 cq_poll = nic->napi[qidx]; 1575 if (!cq_poll) 1576 continue; 1577 napi_disable(&cq_poll->napi); 1578 netif_napi_del(&cq_poll->napi); 1579 } 1580 nicvf_free_cq_poll(nic); 1581 return err; 1582 } 1583 1584 static int nicvf_change_mtu(struct net_device *netdev, int new_mtu) 1585 { 1586 struct nicvf *nic = netdev_priv(netdev); 1587 int orig_mtu = netdev->mtu; 1588 1589 /* For now just support only the usual MTU sized frames, 1590 * plus some headroom for VLAN, QinQ. 1591 */ 1592 if (nic->xdp_prog && new_mtu > MAX_XDP_MTU) { 1593 netdev_warn(netdev, "Jumbo frames not yet supported with XDP, current MTU %d.\n", 1594 netdev->mtu); 1595 return -EINVAL; 1596 } 1597 1598 netdev->mtu = new_mtu; 1599 1600 if (!netif_running(netdev)) 1601 return 0; 1602 1603 if (nicvf_update_hw_max_frs(nic, new_mtu)) { 1604 netdev->mtu = orig_mtu; 1605 return -EINVAL; 1606 } 1607 1608 return 0; 1609 } 1610 1611 static int nicvf_set_mac_address(struct net_device *netdev, void *p) 1612 { 1613 struct sockaddr *addr = p; 1614 struct nicvf *nic = netdev_priv(netdev); 1615 1616 if (!is_valid_ether_addr(addr->sa_data)) 1617 return -EADDRNOTAVAIL; 1618 1619 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len); 1620 1621 if (nic->pdev->msix_enabled) { 1622 if (nicvf_hw_set_mac_addr(nic, netdev)) 1623 return -EBUSY; 1624 } else { 1625 nic->set_mac_pending = true; 1626 } 1627 1628 return 0; 1629 } 1630 1631 void nicvf_update_lmac_stats(struct nicvf *nic) 1632 { 1633 int stat = 0; 1634 union nic_mbx mbx = {}; 1635 1636 if (!netif_running(nic->netdev)) 1637 return; 1638 1639 mbx.bgx_stats.msg = NIC_MBOX_MSG_BGX_STATS; 1640 mbx.bgx_stats.vf_id = nic->vf_id; 1641 /* Rx stats */ 1642 mbx.bgx_stats.rx = 1; 1643 while (stat < BGX_RX_STATS_COUNT) { 1644 mbx.bgx_stats.idx = stat; 1645 if (nicvf_send_msg_to_pf(nic, &mbx)) 1646 return; 1647 stat++; 1648 } 1649 1650 stat = 0; 1651 1652 /* Tx stats */ 1653 mbx.bgx_stats.rx = 0; 1654 while (stat < BGX_TX_STATS_COUNT) { 1655 mbx.bgx_stats.idx = stat; 1656 if (nicvf_send_msg_to_pf(nic, &mbx)) 1657 return; 1658 stat++; 1659 } 1660 } 1661 1662 void nicvf_update_stats(struct nicvf *nic) 1663 { 1664 int qidx, cpu; 1665 u64 tmp_stats = 0; 1666 struct nicvf_hw_stats *stats = &nic->hw_stats; 1667 struct nicvf_drv_stats *drv_stats; 1668 struct queue_set *qs = nic->qs; 1669 1670 #define GET_RX_STATS(reg) \ 1671 nicvf_reg_read(nic, NIC_VNIC_RX_STAT_0_13 | (reg << 3)) 1672 #define GET_TX_STATS(reg) \ 1673 nicvf_reg_read(nic, NIC_VNIC_TX_STAT_0_4 | (reg << 3)) 1674 1675 stats->rx_bytes = GET_RX_STATS(RX_OCTS); 1676 stats->rx_ucast_frames = GET_RX_STATS(RX_UCAST); 1677 stats->rx_bcast_frames = GET_RX_STATS(RX_BCAST); 1678 stats->rx_mcast_frames = GET_RX_STATS(RX_MCAST); 1679 stats->rx_fcs_errors = GET_RX_STATS(RX_FCS); 1680 stats->rx_l2_errors = GET_RX_STATS(RX_L2ERR); 1681 stats->rx_drop_red = GET_RX_STATS(RX_RED); 1682 stats->rx_drop_red_bytes = GET_RX_STATS(RX_RED_OCTS); 1683 stats->rx_drop_overrun = GET_RX_STATS(RX_ORUN); 1684 stats->rx_drop_overrun_bytes = GET_RX_STATS(RX_ORUN_OCTS); 1685 stats->rx_drop_bcast = GET_RX_STATS(RX_DRP_BCAST); 1686 stats->rx_drop_mcast = GET_RX_STATS(RX_DRP_MCAST); 1687 stats->rx_drop_l3_bcast = GET_RX_STATS(RX_DRP_L3BCAST); 1688 stats->rx_drop_l3_mcast = GET_RX_STATS(RX_DRP_L3MCAST); 1689 1690 stats->tx_bytes = GET_TX_STATS(TX_OCTS); 1691 stats->tx_ucast_frames = GET_TX_STATS(TX_UCAST); 1692 stats->tx_bcast_frames = GET_TX_STATS(TX_BCAST); 1693 stats->tx_mcast_frames = GET_TX_STATS(TX_MCAST); 1694 stats->tx_drops = GET_TX_STATS(TX_DROP); 1695 1696 /* On T88 pass 2.0, the dummy SQE added for TSO notification 1697 * via CQE has 'dont_send' set. Hence HW drops the pkt pointed 1698 * pointed by dummy SQE and results in tx_drops counter being 1699 * incremented. Subtracting it from tx_tso counter will give 1700 * exact tx_drops counter. 1701 */ 1702 if (nic->t88 && nic->hw_tso) { 1703 for_each_possible_cpu(cpu) { 1704 drv_stats = per_cpu_ptr(nic->drv_stats, cpu); 1705 tmp_stats += drv_stats->tx_tso; 1706 } 1707 stats->tx_drops = tmp_stats - stats->tx_drops; 1708 } 1709 stats->tx_frames = stats->tx_ucast_frames + 1710 stats->tx_bcast_frames + 1711 stats->tx_mcast_frames; 1712 stats->rx_frames = stats->rx_ucast_frames + 1713 stats->rx_bcast_frames + 1714 stats->rx_mcast_frames; 1715 stats->rx_drops = stats->rx_drop_red + 1716 stats->rx_drop_overrun; 1717 1718 /* Update RQ and SQ stats */ 1719 for (qidx = 0; qidx < qs->rq_cnt; qidx++) 1720 nicvf_update_rq_stats(nic, qidx); 1721 for (qidx = 0; qidx < qs->sq_cnt; qidx++) 1722 nicvf_update_sq_stats(nic, qidx); 1723 } 1724 1725 static void nicvf_get_stats64(struct net_device *netdev, 1726 struct rtnl_link_stats64 *stats) 1727 { 1728 struct nicvf *nic = netdev_priv(netdev); 1729 struct nicvf_hw_stats *hw_stats = &nic->hw_stats; 1730 1731 nicvf_update_stats(nic); 1732 1733 stats->rx_bytes = hw_stats->rx_bytes; 1734 stats->rx_packets = hw_stats->rx_frames; 1735 stats->rx_dropped = hw_stats->rx_drops; 1736 stats->multicast = hw_stats->rx_mcast_frames; 1737 1738 stats->tx_bytes = hw_stats->tx_bytes; 1739 stats->tx_packets = hw_stats->tx_frames; 1740 stats->tx_dropped = hw_stats->tx_drops; 1741 1742 } 1743 1744 static void nicvf_tx_timeout(struct net_device *dev, unsigned int txqueue) 1745 { 1746 struct nicvf *nic = netdev_priv(dev); 1747 1748 netif_warn(nic, tx_err, dev, "Transmit timed out, resetting\n"); 1749 1750 this_cpu_inc(nic->drv_stats->tx_timeout); 1751 schedule_work(&nic->reset_task); 1752 } 1753 1754 static void nicvf_reset_task(struct work_struct *work) 1755 { 1756 struct nicvf *nic; 1757 1758 nic = container_of(work, struct nicvf, reset_task); 1759 1760 if (!netif_running(nic->netdev)) 1761 return; 1762 1763 nicvf_stop(nic->netdev); 1764 nicvf_open(nic->netdev); 1765 netif_trans_update(nic->netdev); 1766 } 1767 1768 static int nicvf_config_loopback(struct nicvf *nic, 1769 netdev_features_t features) 1770 { 1771 union nic_mbx mbx = {}; 1772 1773 mbx.lbk.msg = NIC_MBOX_MSG_LOOPBACK; 1774 mbx.lbk.vf_id = nic->vf_id; 1775 mbx.lbk.enable = (features & NETIF_F_LOOPBACK) != 0; 1776 1777 return nicvf_send_msg_to_pf(nic, &mbx); 1778 } 1779 1780 static netdev_features_t nicvf_fix_features(struct net_device *netdev, 1781 netdev_features_t features) 1782 { 1783 struct nicvf *nic = netdev_priv(netdev); 1784 1785 if ((features & NETIF_F_LOOPBACK) && 1786 netif_running(netdev) && !nic->loopback_supported) 1787 features &= ~NETIF_F_LOOPBACK; 1788 1789 return features; 1790 } 1791 1792 static int nicvf_set_features(struct net_device *netdev, 1793 netdev_features_t features) 1794 { 1795 struct nicvf *nic = netdev_priv(netdev); 1796 netdev_features_t changed = features ^ netdev->features; 1797 1798 if (changed & NETIF_F_HW_VLAN_CTAG_RX) 1799 nicvf_config_vlan_stripping(nic, features); 1800 1801 if ((changed & NETIF_F_LOOPBACK) && netif_running(netdev)) 1802 return nicvf_config_loopback(nic, features); 1803 1804 return 0; 1805 } 1806 1807 static void nicvf_set_xdp_queues(struct nicvf *nic, bool bpf_attached) 1808 { 1809 u8 cq_count, txq_count; 1810 1811 /* Set XDP Tx queue count same as Rx queue count */ 1812 if (!bpf_attached) 1813 nic->xdp_tx_queues = 0; 1814 else 1815 nic->xdp_tx_queues = nic->rx_queues; 1816 1817 /* If queue count > MAX_CMP_QUEUES_PER_QS, then additional qsets 1818 * needs to be allocated, check how many. 1819 */ 1820 txq_count = nic->xdp_tx_queues + nic->tx_queues; 1821 cq_count = max(nic->rx_queues, txq_count); 1822 if (cq_count > MAX_CMP_QUEUES_PER_QS) { 1823 nic->sqs_count = roundup(cq_count, MAX_CMP_QUEUES_PER_QS); 1824 nic->sqs_count = (nic->sqs_count / MAX_CMP_QUEUES_PER_QS) - 1; 1825 } else { 1826 nic->sqs_count = 0; 1827 } 1828 1829 /* Set primary Qset's resources */ 1830 nic->qs->rq_cnt = min_t(u8, nic->rx_queues, MAX_RCV_QUEUES_PER_QS); 1831 nic->qs->sq_cnt = min_t(u8, txq_count, MAX_SND_QUEUES_PER_QS); 1832 nic->qs->cq_cnt = max_t(u8, nic->qs->rq_cnt, nic->qs->sq_cnt); 1833 1834 /* Update stack */ 1835 nicvf_set_real_num_queues(nic->netdev, nic->tx_queues, nic->rx_queues); 1836 } 1837 1838 static int nicvf_xdp_setup(struct nicvf *nic, struct bpf_prog *prog) 1839 { 1840 struct net_device *dev = nic->netdev; 1841 bool if_up = netif_running(nic->netdev); 1842 struct bpf_prog *old_prog; 1843 bool bpf_attached = false; 1844 int ret = 0; 1845 1846 /* For now just support only the usual MTU sized frames, 1847 * plus some headroom for VLAN, QinQ. 1848 */ 1849 if (prog && dev->mtu > MAX_XDP_MTU) { 1850 netdev_warn(dev, "Jumbo frames not yet supported with XDP, current MTU %d.\n", 1851 dev->mtu); 1852 return -EOPNOTSUPP; 1853 } 1854 1855 /* ALL SQs attached to CQs i.e same as RQs, are treated as 1856 * XDP Tx queues and more Tx queues are allocated for 1857 * network stack to send pkts out. 1858 * 1859 * No of Tx queues are either same as Rx queues or whatever 1860 * is left in max no of queues possible. 1861 */ 1862 if ((nic->rx_queues + nic->tx_queues) > nic->max_queues) { 1863 netdev_warn(dev, 1864 "Failed to attach BPF prog, RXQs + TXQs > Max %d\n", 1865 nic->max_queues); 1866 return -ENOMEM; 1867 } 1868 1869 if (if_up) 1870 nicvf_stop(nic->netdev); 1871 1872 old_prog = xchg(&nic->xdp_prog, prog); 1873 /* Detach old prog, if any */ 1874 if (old_prog) 1875 bpf_prog_put(old_prog); 1876 1877 if (nic->xdp_prog) { 1878 /* Attach BPF program */ 1879 bpf_prog_add(nic->xdp_prog, nic->rx_queues - 1); 1880 bpf_attached = true; 1881 } 1882 1883 /* Calculate Tx queues needed for XDP and network stack */ 1884 nicvf_set_xdp_queues(nic, bpf_attached); 1885 1886 if (if_up) { 1887 /* Reinitialize interface, clean slate */ 1888 nicvf_open(nic->netdev); 1889 netif_trans_update(nic->netdev); 1890 } 1891 1892 return ret; 1893 } 1894 1895 static int nicvf_xdp(struct net_device *netdev, struct netdev_bpf *xdp) 1896 { 1897 struct nicvf *nic = netdev_priv(netdev); 1898 1899 /* To avoid checks while retrieving buffer address from CQE_RX, 1900 * do not support XDP for T88 pass1.x silicons which are anyway 1901 * not in use widely. 1902 */ 1903 if (pass1_silicon(nic->pdev)) 1904 return -EOPNOTSUPP; 1905 1906 switch (xdp->command) { 1907 case XDP_SETUP_PROG: 1908 return nicvf_xdp_setup(nic, xdp->prog); 1909 default: 1910 return -EINVAL; 1911 } 1912 } 1913 1914 static int nicvf_config_hwtstamp(struct net_device *netdev, struct ifreq *ifr) 1915 { 1916 struct hwtstamp_config config; 1917 struct nicvf *nic = netdev_priv(netdev); 1918 1919 if (!nic->ptp_clock) 1920 return -ENODEV; 1921 1922 if (copy_from_user(&config, ifr->ifr_data, sizeof(config))) 1923 return -EFAULT; 1924 1925 /* reserved for future extensions */ 1926 if (config.flags) 1927 return -EINVAL; 1928 1929 switch (config.tx_type) { 1930 case HWTSTAMP_TX_OFF: 1931 case HWTSTAMP_TX_ON: 1932 break; 1933 default: 1934 return -ERANGE; 1935 } 1936 1937 switch (config.rx_filter) { 1938 case HWTSTAMP_FILTER_NONE: 1939 nic->hw_rx_tstamp = false; 1940 break; 1941 case HWTSTAMP_FILTER_ALL: 1942 case HWTSTAMP_FILTER_SOME: 1943 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: 1944 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: 1945 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: 1946 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: 1947 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: 1948 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: 1949 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: 1950 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: 1951 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: 1952 case HWTSTAMP_FILTER_PTP_V2_EVENT: 1953 case HWTSTAMP_FILTER_PTP_V2_SYNC: 1954 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: 1955 nic->hw_rx_tstamp = true; 1956 config.rx_filter = HWTSTAMP_FILTER_ALL; 1957 break; 1958 default: 1959 return -ERANGE; 1960 } 1961 1962 if (netif_running(netdev)) 1963 nicvf_config_hw_rx_tstamp(nic, nic->hw_rx_tstamp); 1964 1965 if (copy_to_user(ifr->ifr_data, &config, sizeof(config))) 1966 return -EFAULT; 1967 1968 return 0; 1969 } 1970 1971 static int nicvf_ioctl(struct net_device *netdev, struct ifreq *req, int cmd) 1972 { 1973 switch (cmd) { 1974 case SIOCSHWTSTAMP: 1975 return nicvf_config_hwtstamp(netdev, req); 1976 default: 1977 return -EOPNOTSUPP; 1978 } 1979 } 1980 1981 static void __nicvf_set_rx_mode_task(u8 mode, struct xcast_addr_list *mc_addrs, 1982 struct nicvf *nic) 1983 { 1984 union nic_mbx mbx = {}; 1985 int idx; 1986 1987 /* From the inside of VM code flow we have only 128 bits memory 1988 * available to send message to host's PF, so send all mc addrs 1989 * one by one, starting from flush command in case if kernel 1990 * requests to configure specific MAC filtering 1991 */ 1992 1993 /* flush DMAC filters and reset RX mode */ 1994 mbx.xcast.msg = NIC_MBOX_MSG_RESET_XCAST; 1995 if (nicvf_send_msg_to_pf(nic, &mbx) < 0) 1996 goto free_mc; 1997 1998 if (mode & BGX_XCAST_MCAST_FILTER) { 1999 /* once enabling filtering, we need to signal to PF to add 2000 * its' own LMAC to the filter to accept packets for it. 2001 */ 2002 mbx.xcast.msg = NIC_MBOX_MSG_ADD_MCAST; 2003 mbx.xcast.mac = 0; 2004 if (nicvf_send_msg_to_pf(nic, &mbx) < 0) 2005 goto free_mc; 2006 } 2007 2008 /* check if we have any specific MACs to be added to PF DMAC filter */ 2009 if (mc_addrs) { 2010 /* now go through kernel list of MACs and add them one by one */ 2011 for (idx = 0; idx < mc_addrs->count; idx++) { 2012 mbx.xcast.msg = NIC_MBOX_MSG_ADD_MCAST; 2013 mbx.xcast.mac = mc_addrs->mc[idx]; 2014 if (nicvf_send_msg_to_pf(nic, &mbx) < 0) 2015 goto free_mc; 2016 } 2017 } 2018 2019 /* and finally set rx mode for PF accordingly */ 2020 mbx.xcast.msg = NIC_MBOX_MSG_SET_XCAST; 2021 mbx.xcast.mode = mode; 2022 2023 nicvf_send_msg_to_pf(nic, &mbx); 2024 free_mc: 2025 kfree(mc_addrs); 2026 } 2027 2028 static void nicvf_set_rx_mode_task(struct work_struct *work_arg) 2029 { 2030 struct nicvf_work *vf_work = container_of(work_arg, struct nicvf_work, 2031 work); 2032 struct nicvf *nic = container_of(vf_work, struct nicvf, rx_mode_work); 2033 u8 mode; 2034 struct xcast_addr_list *mc; 2035 2036 if (!vf_work) 2037 return; 2038 2039 /* Save message data locally to prevent them from 2040 * being overwritten by next ndo_set_rx_mode call(). 2041 */ 2042 spin_lock_bh(&nic->rx_mode_wq_lock); 2043 mode = vf_work->mode; 2044 mc = vf_work->mc; 2045 vf_work->mc = NULL; 2046 spin_unlock_bh(&nic->rx_mode_wq_lock); 2047 2048 __nicvf_set_rx_mode_task(mode, mc, nic); 2049 } 2050 2051 static void nicvf_set_rx_mode(struct net_device *netdev) 2052 { 2053 struct nicvf *nic = netdev_priv(netdev); 2054 struct netdev_hw_addr *ha; 2055 struct xcast_addr_list *mc_list = NULL; 2056 u8 mode = 0; 2057 2058 if (netdev->flags & IFF_PROMISC) { 2059 mode = BGX_XCAST_BCAST_ACCEPT | BGX_XCAST_MCAST_ACCEPT; 2060 } else { 2061 if (netdev->flags & IFF_BROADCAST) 2062 mode |= BGX_XCAST_BCAST_ACCEPT; 2063 2064 if (netdev->flags & IFF_ALLMULTI) { 2065 mode |= BGX_XCAST_MCAST_ACCEPT; 2066 } else if (netdev->flags & IFF_MULTICAST) { 2067 mode |= BGX_XCAST_MCAST_FILTER; 2068 /* here we need to copy mc addrs */ 2069 if (netdev_mc_count(netdev)) { 2070 mc_list = kmalloc(offsetof(typeof(*mc_list), 2071 mc[netdev_mc_count(netdev)]), 2072 GFP_ATOMIC); 2073 if (unlikely(!mc_list)) 2074 return; 2075 mc_list->count = 0; 2076 netdev_hw_addr_list_for_each(ha, &netdev->mc) { 2077 mc_list->mc[mc_list->count] = 2078 ether_addr_to_u64(ha->addr); 2079 mc_list->count++; 2080 } 2081 } 2082 } 2083 } 2084 spin_lock(&nic->rx_mode_wq_lock); 2085 kfree(nic->rx_mode_work.mc); 2086 nic->rx_mode_work.mc = mc_list; 2087 nic->rx_mode_work.mode = mode; 2088 queue_work(nic->nicvf_rx_mode_wq, &nic->rx_mode_work.work); 2089 spin_unlock(&nic->rx_mode_wq_lock); 2090 } 2091 2092 static const struct net_device_ops nicvf_netdev_ops = { 2093 .ndo_open = nicvf_open, 2094 .ndo_stop = nicvf_stop, 2095 .ndo_start_xmit = nicvf_xmit, 2096 .ndo_change_mtu = nicvf_change_mtu, 2097 .ndo_set_mac_address = nicvf_set_mac_address, 2098 .ndo_get_stats64 = nicvf_get_stats64, 2099 .ndo_tx_timeout = nicvf_tx_timeout, 2100 .ndo_fix_features = nicvf_fix_features, 2101 .ndo_set_features = nicvf_set_features, 2102 .ndo_bpf = nicvf_xdp, 2103 .ndo_do_ioctl = nicvf_ioctl, 2104 .ndo_set_rx_mode = nicvf_set_rx_mode, 2105 }; 2106 2107 static int nicvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 2108 { 2109 struct device *dev = &pdev->dev; 2110 struct net_device *netdev; 2111 struct nicvf *nic; 2112 int err, qcount; 2113 u16 sdevid; 2114 struct cavium_ptp *ptp_clock; 2115 2116 ptp_clock = cavium_ptp_get(); 2117 if (IS_ERR(ptp_clock)) { 2118 if (PTR_ERR(ptp_clock) == -ENODEV) 2119 /* In virtualized environment we proceed without ptp */ 2120 ptp_clock = NULL; 2121 else 2122 return PTR_ERR(ptp_clock); 2123 } 2124 2125 err = pci_enable_device(pdev); 2126 if (err) { 2127 dev_err(dev, "Failed to enable PCI device\n"); 2128 return err; 2129 } 2130 2131 err = pci_request_regions(pdev, DRV_NAME); 2132 if (err) { 2133 dev_err(dev, "PCI request regions failed 0x%x\n", err); 2134 goto err_disable_device; 2135 } 2136 2137 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(48)); 2138 if (err) { 2139 dev_err(dev, "Unable to get usable DMA configuration\n"); 2140 goto err_release_regions; 2141 } 2142 2143 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(48)); 2144 if (err) { 2145 dev_err(dev, "unable to get 48-bit DMA for consistent allocations\n"); 2146 goto err_release_regions; 2147 } 2148 2149 qcount = netif_get_num_default_rss_queues(); 2150 2151 /* Restrict multiqset support only for host bound VFs */ 2152 if (pdev->is_virtfn) { 2153 /* Set max number of queues per VF */ 2154 qcount = min_t(int, num_online_cpus(), 2155 (MAX_SQS_PER_VF + 1) * MAX_CMP_QUEUES_PER_QS); 2156 } 2157 2158 netdev = alloc_etherdev_mqs(sizeof(struct nicvf), qcount, qcount); 2159 if (!netdev) { 2160 err = -ENOMEM; 2161 goto err_release_regions; 2162 } 2163 2164 pci_set_drvdata(pdev, netdev); 2165 2166 SET_NETDEV_DEV(netdev, &pdev->dev); 2167 2168 nic = netdev_priv(netdev); 2169 nic->netdev = netdev; 2170 nic->pdev = pdev; 2171 nic->pnicvf = nic; 2172 nic->max_queues = qcount; 2173 /* If no of CPUs are too low, there won't be any queues left 2174 * for XDP_TX, hence double it. 2175 */ 2176 if (!nic->t88) 2177 nic->max_queues *= 2; 2178 nic->ptp_clock = ptp_clock; 2179 2180 /* Initialize mutex that serializes usage of VF's mailbox */ 2181 mutex_init(&nic->rx_mode_mtx); 2182 2183 /* MAP VF's configuration registers */ 2184 nic->reg_base = pcim_iomap(pdev, PCI_CFG_REG_BAR_NUM, 0); 2185 if (!nic->reg_base) { 2186 dev_err(dev, "Cannot map config register space, aborting\n"); 2187 err = -ENOMEM; 2188 goto err_free_netdev; 2189 } 2190 2191 nic->drv_stats = netdev_alloc_pcpu_stats(struct nicvf_drv_stats); 2192 if (!nic->drv_stats) { 2193 err = -ENOMEM; 2194 goto err_free_netdev; 2195 } 2196 2197 err = nicvf_set_qset_resources(nic); 2198 if (err) 2199 goto err_free_netdev; 2200 2201 /* Check if PF is alive and get MAC address for this VF */ 2202 err = nicvf_register_misc_interrupt(nic); 2203 if (err) 2204 goto err_free_netdev; 2205 2206 nicvf_send_vf_struct(nic); 2207 2208 if (!pass1_silicon(nic->pdev)) 2209 nic->hw_tso = true; 2210 2211 /* Get iommu domain for iova to physical addr conversion */ 2212 nic->iommu_domain = iommu_get_domain_for_dev(dev); 2213 2214 pci_read_config_word(nic->pdev, PCI_SUBSYSTEM_ID, &sdevid); 2215 if (sdevid == 0xA134) 2216 nic->t88 = true; 2217 2218 /* Check if this VF is in QS only mode */ 2219 if (nic->sqs_mode) 2220 return 0; 2221 2222 err = nicvf_set_real_num_queues(netdev, nic->tx_queues, nic->rx_queues); 2223 if (err) 2224 goto err_unregister_interrupts; 2225 2226 netdev->hw_features = (NETIF_F_RXCSUM | NETIF_F_SG | 2227 NETIF_F_TSO | NETIF_F_GRO | NETIF_F_TSO6 | 2228 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | 2229 NETIF_F_HW_VLAN_CTAG_RX); 2230 2231 netdev->hw_features |= NETIF_F_RXHASH; 2232 2233 netdev->features |= netdev->hw_features; 2234 netdev->hw_features |= NETIF_F_LOOPBACK; 2235 2236 netdev->vlan_features = NETIF_F_SG | NETIF_F_IP_CSUM | 2237 NETIF_F_IPV6_CSUM | NETIF_F_TSO | NETIF_F_TSO6; 2238 2239 netdev->netdev_ops = &nicvf_netdev_ops; 2240 netdev->watchdog_timeo = NICVF_TX_TIMEOUT; 2241 2242 /* MTU range: 64 - 9200 */ 2243 netdev->min_mtu = NIC_HW_MIN_FRS; 2244 netdev->max_mtu = NIC_HW_MAX_FRS; 2245 2246 INIT_WORK(&nic->reset_task, nicvf_reset_task); 2247 2248 nic->nicvf_rx_mode_wq = alloc_ordered_workqueue("nicvf_rx_mode_wq_VF%d", 2249 WQ_MEM_RECLAIM, 2250 nic->vf_id); 2251 if (!nic->nicvf_rx_mode_wq) { 2252 err = -ENOMEM; 2253 dev_err(dev, "Failed to allocate work queue\n"); 2254 goto err_unregister_interrupts; 2255 } 2256 2257 INIT_WORK(&nic->rx_mode_work.work, nicvf_set_rx_mode_task); 2258 spin_lock_init(&nic->rx_mode_wq_lock); 2259 2260 err = register_netdev(netdev); 2261 if (err) { 2262 dev_err(dev, "Failed to register netdevice\n"); 2263 goto err_unregister_interrupts; 2264 } 2265 2266 nic->msg_enable = debug; 2267 2268 nicvf_set_ethtool_ops(netdev); 2269 2270 return 0; 2271 2272 err_unregister_interrupts: 2273 nicvf_unregister_interrupts(nic); 2274 err_free_netdev: 2275 pci_set_drvdata(pdev, NULL); 2276 if (nic->drv_stats) 2277 free_percpu(nic->drv_stats); 2278 free_netdev(netdev); 2279 err_release_regions: 2280 pci_release_regions(pdev); 2281 err_disable_device: 2282 pci_disable_device(pdev); 2283 return err; 2284 } 2285 2286 static void nicvf_remove(struct pci_dev *pdev) 2287 { 2288 struct net_device *netdev = pci_get_drvdata(pdev); 2289 struct nicvf *nic; 2290 struct net_device *pnetdev; 2291 2292 if (!netdev) 2293 return; 2294 2295 nic = netdev_priv(netdev); 2296 pnetdev = nic->pnicvf->netdev; 2297 2298 /* Check if this Qset is assigned to different VF. 2299 * If yes, clean primary and all secondary Qsets. 2300 */ 2301 if (pnetdev && (pnetdev->reg_state == NETREG_REGISTERED)) 2302 unregister_netdev(pnetdev); 2303 if (nic->nicvf_rx_mode_wq) { 2304 destroy_workqueue(nic->nicvf_rx_mode_wq); 2305 nic->nicvf_rx_mode_wq = NULL; 2306 } 2307 nicvf_unregister_interrupts(nic); 2308 pci_set_drvdata(pdev, NULL); 2309 if (nic->drv_stats) 2310 free_percpu(nic->drv_stats); 2311 cavium_ptp_put(nic->ptp_clock); 2312 free_netdev(netdev); 2313 pci_release_regions(pdev); 2314 pci_disable_device(pdev); 2315 } 2316 2317 static void nicvf_shutdown(struct pci_dev *pdev) 2318 { 2319 nicvf_remove(pdev); 2320 } 2321 2322 static struct pci_driver nicvf_driver = { 2323 .name = DRV_NAME, 2324 .id_table = nicvf_id_table, 2325 .probe = nicvf_probe, 2326 .remove = nicvf_remove, 2327 .shutdown = nicvf_shutdown, 2328 }; 2329 2330 static int __init nicvf_init_module(void) 2331 { 2332 pr_info("%s, ver %s\n", DRV_NAME, DRV_VERSION); 2333 return pci_register_driver(&nicvf_driver); 2334 } 2335 2336 static void __exit nicvf_cleanup_module(void) 2337 { 2338 pci_unregister_driver(&nicvf_driver); 2339 } 2340 2341 module_init(nicvf_init_module); 2342 module_exit(nicvf_cleanup_module); 2343