1 /* 2 * Copyright 2008-2010 Cisco Systems, Inc. All rights reserved. 3 * Copyright 2007 Nuova Systems, Inc. All rights reserved. 4 * 5 * This program is free software; you may redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; version 2 of the License. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 16 * SOFTWARE. 17 * 18 */ 19 20 #include <linux/module.h> 21 #include <linux/kernel.h> 22 #include <linux/string.h> 23 #include <linux/errno.h> 24 #include <linux/types.h> 25 #include <linux/init.h> 26 #include <linux/interrupt.h> 27 #include <linux/workqueue.h> 28 #include <linux/pci.h> 29 #include <linux/netdevice.h> 30 #include <linux/etherdevice.h> 31 #include <linux/if.h> 32 #include <linux/if_ether.h> 33 #include <linux/if_vlan.h> 34 #include <linux/in.h> 35 #include <linux/ip.h> 36 #include <linux/ipv6.h> 37 #include <linux/tcp.h> 38 #include <linux/rtnetlink.h> 39 #include <linux/prefetch.h> 40 #include <net/ip6_checksum.h> 41 #include <linux/ktime.h> 42 #include <linux/numa.h> 43 #ifdef CONFIG_RFS_ACCEL 44 #include <linux/cpu_rmap.h> 45 #endif 46 #include <linux/crash_dump.h> 47 #include <net/busy_poll.h> 48 #include <net/vxlan.h> 49 50 #include "cq_enet_desc.h" 51 #include "vnic_dev.h" 52 #include "vnic_intr.h" 53 #include "vnic_stats.h" 54 #include "vnic_vic.h" 55 #include "enic_res.h" 56 #include "enic.h" 57 #include "enic_dev.h" 58 #include "enic_pp.h" 59 #include "enic_clsf.h" 60 61 #define ENIC_NOTIFY_TIMER_PERIOD (2 * HZ) 62 #define WQ_ENET_MAX_DESC_LEN (1 << WQ_ENET_LEN_BITS) 63 #define MAX_TSO (1 << 16) 64 #define ENIC_DESC_MAX_SPLITS (MAX_TSO / WQ_ENET_MAX_DESC_LEN + 1) 65 66 #define PCI_DEVICE_ID_CISCO_VIC_ENET 0x0043 /* ethernet vnic */ 67 #define PCI_DEVICE_ID_CISCO_VIC_ENET_DYN 0x0044 /* enet dynamic vnic */ 68 #define PCI_DEVICE_ID_CISCO_VIC_ENET_VF 0x0071 /* enet SRIOV VF */ 69 70 #define RX_COPYBREAK_DEFAULT 256 71 72 /* Supported devices */ 73 static const struct pci_device_id enic_id_table[] = { 74 { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET) }, 75 { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_DYN) }, 76 { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_VF) }, 77 { 0, } /* end of table */ 78 }; 79 80 MODULE_DESCRIPTION(DRV_DESCRIPTION); 81 MODULE_AUTHOR("Scott Feldman <scofeldm@cisco.com>"); 82 MODULE_LICENSE("GPL"); 83 MODULE_DEVICE_TABLE(pci, enic_id_table); 84 85 #define ENIC_LARGE_PKT_THRESHOLD 1000 86 #define ENIC_MAX_COALESCE_TIMERS 10 87 /* Interrupt moderation table, which will be used to decide the 88 * coalescing timer values 89 * {rx_rate in Mbps, mapping percentage of the range} 90 */ 91 static struct enic_intr_mod_table mod_table[ENIC_MAX_COALESCE_TIMERS + 1] = { 92 {4000, 0}, 93 {4400, 10}, 94 {5060, 20}, 95 {5230, 30}, 96 {5540, 40}, 97 {5820, 50}, 98 {6120, 60}, 99 {6435, 70}, 100 {6745, 80}, 101 {7000, 90}, 102 {0xFFFFFFFF, 100} 103 }; 104 105 /* This table helps the driver to pick different ranges for rx coalescing 106 * timer depending on the link speed. 107 */ 108 static struct enic_intr_mod_range mod_range[ENIC_MAX_LINK_SPEEDS] = { 109 {0, 0}, /* 0 - 4 Gbps */ 110 {0, 3}, /* 4 - 10 Gbps */ 111 {3, 6}, /* 10 - 40 Gbps */ 112 }; 113 114 static void enic_init_affinity_hint(struct enic *enic) 115 { 116 int numa_node = dev_to_node(&enic->pdev->dev); 117 int i; 118 119 for (i = 0; i < enic->intr_count; i++) { 120 if (enic_is_err_intr(enic, i) || enic_is_notify_intr(enic, i) || 121 (cpumask_available(enic->msix[i].affinity_mask) && 122 !cpumask_empty(enic->msix[i].affinity_mask))) 123 continue; 124 if (zalloc_cpumask_var(&enic->msix[i].affinity_mask, 125 GFP_KERNEL)) 126 cpumask_set_cpu(cpumask_local_spread(i, numa_node), 127 enic->msix[i].affinity_mask); 128 } 129 } 130 131 static void enic_free_affinity_hint(struct enic *enic) 132 { 133 int i; 134 135 for (i = 0; i < enic->intr_count; i++) { 136 if (enic_is_err_intr(enic, i) || enic_is_notify_intr(enic, i)) 137 continue; 138 free_cpumask_var(enic->msix[i].affinity_mask); 139 } 140 } 141 142 static void enic_set_affinity_hint(struct enic *enic) 143 { 144 int i; 145 int err; 146 147 for (i = 0; i < enic->intr_count; i++) { 148 if (enic_is_err_intr(enic, i) || 149 enic_is_notify_intr(enic, i) || 150 !cpumask_available(enic->msix[i].affinity_mask) || 151 cpumask_empty(enic->msix[i].affinity_mask)) 152 continue; 153 err = irq_set_affinity_hint(enic->msix_entry[i].vector, 154 enic->msix[i].affinity_mask); 155 if (err) 156 netdev_warn(enic->netdev, "irq_set_affinity_hint failed, err %d\n", 157 err); 158 } 159 160 for (i = 0; i < enic->wq_count; i++) { 161 int wq_intr = enic_msix_wq_intr(enic, i); 162 163 if (cpumask_available(enic->msix[wq_intr].affinity_mask) && 164 !cpumask_empty(enic->msix[wq_intr].affinity_mask)) 165 netif_set_xps_queue(enic->netdev, 166 enic->msix[wq_intr].affinity_mask, 167 i); 168 } 169 } 170 171 static void enic_unset_affinity_hint(struct enic *enic) 172 { 173 int i; 174 175 for (i = 0; i < enic->intr_count; i++) 176 irq_set_affinity_hint(enic->msix_entry[i].vector, NULL); 177 } 178 179 static int enic_udp_tunnel_set_port(struct net_device *netdev, 180 unsigned int table, unsigned int entry, 181 struct udp_tunnel_info *ti) 182 { 183 struct enic *enic = netdev_priv(netdev); 184 int err; 185 186 spin_lock_bh(&enic->devcmd_lock); 187 188 err = vnic_dev_overlay_offload_cfg(enic->vdev, 189 OVERLAY_CFG_VXLAN_PORT_UPDATE, 190 ntohs(ti->port)); 191 if (err) 192 goto error; 193 194 err = vnic_dev_overlay_offload_ctrl(enic->vdev, OVERLAY_FEATURE_VXLAN, 195 enic->vxlan.patch_level); 196 if (err) 197 goto error; 198 199 enic->vxlan.vxlan_udp_port_number = ntohs(ti->port); 200 error: 201 spin_unlock_bh(&enic->devcmd_lock); 202 203 return err; 204 } 205 206 static int enic_udp_tunnel_unset_port(struct net_device *netdev, 207 unsigned int table, unsigned int entry, 208 struct udp_tunnel_info *ti) 209 { 210 struct enic *enic = netdev_priv(netdev); 211 int err; 212 213 spin_lock_bh(&enic->devcmd_lock); 214 215 err = vnic_dev_overlay_offload_ctrl(enic->vdev, OVERLAY_FEATURE_VXLAN, 216 OVERLAY_OFFLOAD_DISABLE); 217 if (err) 218 goto unlock; 219 220 enic->vxlan.vxlan_udp_port_number = 0; 221 222 unlock: 223 spin_unlock_bh(&enic->devcmd_lock); 224 225 return err; 226 } 227 228 static const struct udp_tunnel_nic_info enic_udp_tunnels = { 229 .set_port = enic_udp_tunnel_set_port, 230 .unset_port = enic_udp_tunnel_unset_port, 231 .tables = { 232 { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, }, 233 }, 234 }, enic_udp_tunnels_v4 = { 235 .set_port = enic_udp_tunnel_set_port, 236 .unset_port = enic_udp_tunnel_unset_port, 237 .flags = UDP_TUNNEL_NIC_INFO_IPV4_ONLY, 238 .tables = { 239 { .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, }, 240 }, 241 }; 242 243 static netdev_features_t enic_features_check(struct sk_buff *skb, 244 struct net_device *dev, 245 netdev_features_t features) 246 { 247 const struct ethhdr *eth = (struct ethhdr *)skb_inner_mac_header(skb); 248 struct enic *enic = netdev_priv(dev); 249 struct udphdr *udph; 250 u16 port = 0; 251 u8 proto; 252 253 if (!skb->encapsulation) 254 return features; 255 256 features = vxlan_features_check(skb, features); 257 258 switch (vlan_get_protocol(skb)) { 259 case htons(ETH_P_IPV6): 260 if (!(enic->vxlan.flags & ENIC_VXLAN_OUTER_IPV6)) 261 goto out; 262 proto = ipv6_hdr(skb)->nexthdr; 263 break; 264 case htons(ETH_P_IP): 265 proto = ip_hdr(skb)->protocol; 266 break; 267 default: 268 goto out; 269 } 270 271 switch (eth->h_proto) { 272 case ntohs(ETH_P_IPV6): 273 if (!(enic->vxlan.flags & ENIC_VXLAN_INNER_IPV6)) 274 goto out; 275 fallthrough; 276 case ntohs(ETH_P_IP): 277 break; 278 default: 279 goto out; 280 } 281 282 283 if (proto == IPPROTO_UDP) { 284 udph = udp_hdr(skb); 285 port = be16_to_cpu(udph->dest); 286 } 287 288 /* HW supports offload of only one UDP port. Remove CSUM and GSO MASK 289 * for other UDP port tunnels 290 */ 291 if (port != enic->vxlan.vxlan_udp_port_number) 292 goto out; 293 294 return features; 295 296 out: 297 return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); 298 } 299 300 int enic_is_dynamic(struct enic *enic) 301 { 302 return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_DYN; 303 } 304 305 int enic_sriov_enabled(struct enic *enic) 306 { 307 return (enic->priv_flags & ENIC_SRIOV_ENABLED) ? 1 : 0; 308 } 309 310 static int enic_is_sriov_vf(struct enic *enic) 311 { 312 return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_VF; 313 } 314 315 int enic_is_valid_vf(struct enic *enic, int vf) 316 { 317 #ifdef CONFIG_PCI_IOV 318 return vf >= 0 && vf < enic->num_vfs; 319 #else 320 return 0; 321 #endif 322 } 323 324 static void enic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf) 325 { 326 struct enic *enic = vnic_dev_priv(wq->vdev); 327 328 if (buf->sop) 329 dma_unmap_single(&enic->pdev->dev, buf->dma_addr, buf->len, 330 DMA_TO_DEVICE); 331 else 332 dma_unmap_page(&enic->pdev->dev, buf->dma_addr, buf->len, 333 DMA_TO_DEVICE); 334 335 if (buf->os_buf) 336 dev_kfree_skb_any(buf->os_buf); 337 } 338 339 static void enic_wq_free_buf(struct vnic_wq *wq, 340 struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque) 341 { 342 enic_free_wq_buf(wq, buf); 343 } 344 345 static int enic_wq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc, 346 u8 type, u16 q_number, u16 completed_index, void *opaque) 347 { 348 struct enic *enic = vnic_dev_priv(vdev); 349 350 spin_lock(&enic->wq_lock[q_number]); 351 352 vnic_wq_service(&enic->wq[q_number], cq_desc, 353 completed_index, enic_wq_free_buf, 354 opaque); 355 356 if (netif_tx_queue_stopped(netdev_get_tx_queue(enic->netdev, q_number)) && 357 vnic_wq_desc_avail(&enic->wq[q_number]) >= 358 (MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS)) 359 netif_wake_subqueue(enic->netdev, q_number); 360 361 spin_unlock(&enic->wq_lock[q_number]); 362 363 return 0; 364 } 365 366 static bool enic_log_q_error(struct enic *enic) 367 { 368 unsigned int i; 369 u32 error_status; 370 bool err = false; 371 372 for (i = 0; i < enic->wq_count; i++) { 373 error_status = vnic_wq_error_status(&enic->wq[i]); 374 err |= error_status; 375 if (error_status) 376 netdev_err(enic->netdev, "WQ[%d] error_status %d\n", 377 i, error_status); 378 } 379 380 for (i = 0; i < enic->rq_count; i++) { 381 error_status = vnic_rq_error_status(&enic->rq[i]); 382 err |= error_status; 383 if (error_status) 384 netdev_err(enic->netdev, "RQ[%d] error_status %d\n", 385 i, error_status); 386 } 387 388 return err; 389 } 390 391 static void enic_msglvl_check(struct enic *enic) 392 { 393 u32 msg_enable = vnic_dev_msg_lvl(enic->vdev); 394 395 if (msg_enable != enic->msg_enable) { 396 netdev_info(enic->netdev, "msg lvl changed from 0x%x to 0x%x\n", 397 enic->msg_enable, msg_enable); 398 enic->msg_enable = msg_enable; 399 } 400 } 401 402 static void enic_mtu_check(struct enic *enic) 403 { 404 u32 mtu = vnic_dev_mtu(enic->vdev); 405 struct net_device *netdev = enic->netdev; 406 407 if (mtu && mtu != enic->port_mtu) { 408 enic->port_mtu = mtu; 409 if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) { 410 mtu = max_t(int, ENIC_MIN_MTU, 411 min_t(int, ENIC_MAX_MTU, mtu)); 412 if (mtu != netdev->mtu) 413 schedule_work(&enic->change_mtu_work); 414 } else { 415 if (mtu < netdev->mtu) 416 netdev_warn(netdev, 417 "interface MTU (%d) set higher " 418 "than switch port MTU (%d)\n", 419 netdev->mtu, mtu); 420 } 421 } 422 } 423 424 static void enic_link_check(struct enic *enic) 425 { 426 int link_status = vnic_dev_link_status(enic->vdev); 427 int carrier_ok = netif_carrier_ok(enic->netdev); 428 429 if (link_status && !carrier_ok) { 430 netdev_info(enic->netdev, "Link UP\n"); 431 netif_carrier_on(enic->netdev); 432 } else if (!link_status && carrier_ok) { 433 netdev_info(enic->netdev, "Link DOWN\n"); 434 netif_carrier_off(enic->netdev); 435 } 436 } 437 438 static void enic_notify_check(struct enic *enic) 439 { 440 enic_msglvl_check(enic); 441 enic_mtu_check(enic); 442 enic_link_check(enic); 443 } 444 445 #define ENIC_TEST_INTR(pba, i) (pba & (1 << i)) 446 447 static irqreturn_t enic_isr_legacy(int irq, void *data) 448 { 449 struct net_device *netdev = data; 450 struct enic *enic = netdev_priv(netdev); 451 unsigned int io_intr = enic_legacy_io_intr(); 452 unsigned int err_intr = enic_legacy_err_intr(); 453 unsigned int notify_intr = enic_legacy_notify_intr(); 454 u32 pba; 455 456 vnic_intr_mask(&enic->intr[io_intr]); 457 458 pba = vnic_intr_legacy_pba(enic->legacy_pba); 459 if (!pba) { 460 vnic_intr_unmask(&enic->intr[io_intr]); 461 return IRQ_NONE; /* not our interrupt */ 462 } 463 464 if (ENIC_TEST_INTR(pba, notify_intr)) { 465 enic_notify_check(enic); 466 vnic_intr_return_all_credits(&enic->intr[notify_intr]); 467 } 468 469 if (ENIC_TEST_INTR(pba, err_intr)) { 470 vnic_intr_return_all_credits(&enic->intr[err_intr]); 471 enic_log_q_error(enic); 472 /* schedule recovery from WQ/RQ error */ 473 schedule_work(&enic->reset); 474 return IRQ_HANDLED; 475 } 476 477 if (ENIC_TEST_INTR(pba, io_intr)) 478 napi_schedule_irqoff(&enic->napi[0]); 479 else 480 vnic_intr_unmask(&enic->intr[io_intr]); 481 482 return IRQ_HANDLED; 483 } 484 485 static irqreturn_t enic_isr_msi(int irq, void *data) 486 { 487 struct enic *enic = data; 488 489 /* With MSI, there is no sharing of interrupts, so this is 490 * our interrupt and there is no need to ack it. The device 491 * is not providing per-vector masking, so the OS will not 492 * write to PCI config space to mask/unmask the interrupt. 493 * We're using mask_on_assertion for MSI, so the device 494 * automatically masks the interrupt when the interrupt is 495 * generated. Later, when exiting polling, the interrupt 496 * will be unmasked (see enic_poll). 497 * 498 * Also, the device uses the same PCIe Traffic Class (TC) 499 * for Memory Write data and MSI, so there are no ordering 500 * issues; the MSI will always arrive at the Root Complex 501 * _after_ corresponding Memory Writes (i.e. descriptor 502 * writes). 503 */ 504 505 napi_schedule_irqoff(&enic->napi[0]); 506 507 return IRQ_HANDLED; 508 } 509 510 static irqreturn_t enic_isr_msix(int irq, void *data) 511 { 512 struct napi_struct *napi = data; 513 514 napi_schedule_irqoff(napi); 515 516 return IRQ_HANDLED; 517 } 518 519 static irqreturn_t enic_isr_msix_err(int irq, void *data) 520 { 521 struct enic *enic = data; 522 unsigned int intr = enic_msix_err_intr(enic); 523 524 vnic_intr_return_all_credits(&enic->intr[intr]); 525 526 if (enic_log_q_error(enic)) 527 /* schedule recovery from WQ/RQ error */ 528 schedule_work(&enic->reset); 529 530 return IRQ_HANDLED; 531 } 532 533 static irqreturn_t enic_isr_msix_notify(int irq, void *data) 534 { 535 struct enic *enic = data; 536 unsigned int intr = enic_msix_notify_intr(enic); 537 538 enic_notify_check(enic); 539 vnic_intr_return_all_credits(&enic->intr[intr]); 540 541 return IRQ_HANDLED; 542 } 543 544 static int enic_queue_wq_skb_cont(struct enic *enic, struct vnic_wq *wq, 545 struct sk_buff *skb, unsigned int len_left, 546 int loopback) 547 { 548 const skb_frag_t *frag; 549 dma_addr_t dma_addr; 550 551 /* Queue additional data fragments */ 552 for (frag = skb_shinfo(skb)->frags; len_left; frag++) { 553 len_left -= skb_frag_size(frag); 554 dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag, 0, 555 skb_frag_size(frag), 556 DMA_TO_DEVICE); 557 if (unlikely(enic_dma_map_check(enic, dma_addr))) 558 return -ENOMEM; 559 enic_queue_wq_desc_cont(wq, skb, dma_addr, skb_frag_size(frag), 560 (len_left == 0), /* EOP? */ 561 loopback); 562 } 563 564 return 0; 565 } 566 567 static int enic_queue_wq_skb_vlan(struct enic *enic, struct vnic_wq *wq, 568 struct sk_buff *skb, int vlan_tag_insert, 569 unsigned int vlan_tag, int loopback) 570 { 571 unsigned int head_len = skb_headlen(skb); 572 unsigned int len_left = skb->len - head_len; 573 int eop = (len_left == 0); 574 dma_addr_t dma_addr; 575 int err = 0; 576 577 dma_addr = dma_map_single(&enic->pdev->dev, skb->data, head_len, 578 DMA_TO_DEVICE); 579 if (unlikely(enic_dma_map_check(enic, dma_addr))) 580 return -ENOMEM; 581 582 /* Queue the main skb fragment. The fragments are no larger 583 * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less 584 * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor 585 * per fragment is queued. 586 */ 587 enic_queue_wq_desc(wq, skb, dma_addr, head_len, vlan_tag_insert, 588 vlan_tag, eop, loopback); 589 590 if (!eop) 591 err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback); 592 593 return err; 594 } 595 596 static int enic_queue_wq_skb_csum_l4(struct enic *enic, struct vnic_wq *wq, 597 struct sk_buff *skb, int vlan_tag_insert, 598 unsigned int vlan_tag, int loopback) 599 { 600 unsigned int head_len = skb_headlen(skb); 601 unsigned int len_left = skb->len - head_len; 602 unsigned int hdr_len = skb_checksum_start_offset(skb); 603 unsigned int csum_offset = hdr_len + skb->csum_offset; 604 int eop = (len_left == 0); 605 dma_addr_t dma_addr; 606 int err = 0; 607 608 dma_addr = dma_map_single(&enic->pdev->dev, skb->data, head_len, 609 DMA_TO_DEVICE); 610 if (unlikely(enic_dma_map_check(enic, dma_addr))) 611 return -ENOMEM; 612 613 /* Queue the main skb fragment. The fragments are no larger 614 * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less 615 * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor 616 * per fragment is queued. 617 */ 618 enic_queue_wq_desc_csum_l4(wq, skb, dma_addr, head_len, csum_offset, 619 hdr_len, vlan_tag_insert, vlan_tag, eop, 620 loopback); 621 622 if (!eop) 623 err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback); 624 625 return err; 626 } 627 628 static void enic_preload_tcp_csum_encap(struct sk_buff *skb) 629 { 630 const struct ethhdr *eth = (struct ethhdr *)skb_inner_mac_header(skb); 631 632 switch (eth->h_proto) { 633 case ntohs(ETH_P_IP): 634 inner_ip_hdr(skb)->check = 0; 635 inner_tcp_hdr(skb)->check = 636 ~csum_tcpudp_magic(inner_ip_hdr(skb)->saddr, 637 inner_ip_hdr(skb)->daddr, 0, 638 IPPROTO_TCP, 0); 639 break; 640 case ntohs(ETH_P_IPV6): 641 inner_tcp_hdr(skb)->check = 642 ~csum_ipv6_magic(&inner_ipv6_hdr(skb)->saddr, 643 &inner_ipv6_hdr(skb)->daddr, 0, 644 IPPROTO_TCP, 0); 645 break; 646 default: 647 WARN_ONCE(1, "Non ipv4/ipv6 inner pkt for encap offload"); 648 break; 649 } 650 } 651 652 static void enic_preload_tcp_csum(struct sk_buff *skb) 653 { 654 /* Preload TCP csum field with IP pseudo hdr calculated 655 * with IP length set to zero. HW will later add in length 656 * to each TCP segment resulting from the TSO. 657 */ 658 659 if (skb->protocol == cpu_to_be16(ETH_P_IP)) { 660 ip_hdr(skb)->check = 0; 661 tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr, 662 ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0); 663 } else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) { 664 tcp_v6_gso_csum_prep(skb); 665 } 666 } 667 668 static int enic_queue_wq_skb_tso(struct enic *enic, struct vnic_wq *wq, 669 struct sk_buff *skb, unsigned int mss, 670 int vlan_tag_insert, unsigned int vlan_tag, 671 int loopback) 672 { 673 unsigned int frag_len_left = skb_headlen(skb); 674 unsigned int len_left = skb->len - frag_len_left; 675 int eop = (len_left == 0); 676 unsigned int offset = 0; 677 unsigned int hdr_len; 678 dma_addr_t dma_addr; 679 unsigned int len; 680 skb_frag_t *frag; 681 682 if (skb->encapsulation) { 683 hdr_len = skb_inner_transport_header(skb) - skb->data; 684 hdr_len += inner_tcp_hdrlen(skb); 685 enic_preload_tcp_csum_encap(skb); 686 } else { 687 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb); 688 enic_preload_tcp_csum(skb); 689 } 690 691 /* Queue WQ_ENET_MAX_DESC_LEN length descriptors 692 * for the main skb fragment 693 */ 694 while (frag_len_left) { 695 len = min(frag_len_left, (unsigned int)WQ_ENET_MAX_DESC_LEN); 696 dma_addr = dma_map_single(&enic->pdev->dev, 697 skb->data + offset, len, 698 DMA_TO_DEVICE); 699 if (unlikely(enic_dma_map_check(enic, dma_addr))) 700 return -ENOMEM; 701 enic_queue_wq_desc_tso(wq, skb, dma_addr, len, mss, hdr_len, 702 vlan_tag_insert, vlan_tag, 703 eop && (len == frag_len_left), loopback); 704 frag_len_left -= len; 705 offset += len; 706 } 707 708 if (eop) 709 return 0; 710 711 /* Queue WQ_ENET_MAX_DESC_LEN length descriptors 712 * for additional data fragments 713 */ 714 for (frag = skb_shinfo(skb)->frags; len_left; frag++) { 715 len_left -= skb_frag_size(frag); 716 frag_len_left = skb_frag_size(frag); 717 offset = 0; 718 719 while (frag_len_left) { 720 len = min(frag_len_left, 721 (unsigned int)WQ_ENET_MAX_DESC_LEN); 722 dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag, 723 offset, len, 724 DMA_TO_DEVICE); 725 if (unlikely(enic_dma_map_check(enic, dma_addr))) 726 return -ENOMEM; 727 enic_queue_wq_desc_cont(wq, skb, dma_addr, len, 728 (len_left == 0) && 729 (len == frag_len_left),/*EOP*/ 730 loopback); 731 frag_len_left -= len; 732 offset += len; 733 } 734 } 735 736 return 0; 737 } 738 739 static inline int enic_queue_wq_skb_encap(struct enic *enic, struct vnic_wq *wq, 740 struct sk_buff *skb, 741 int vlan_tag_insert, 742 unsigned int vlan_tag, int loopback) 743 { 744 unsigned int head_len = skb_headlen(skb); 745 unsigned int len_left = skb->len - head_len; 746 /* Hardware will overwrite the checksum fields, calculating from 747 * scratch and ignoring the value placed by software. 748 * Offload mode = 00 749 * mss[2], mss[1], mss[0] bits are set 750 */ 751 unsigned int mss_or_csum = 7; 752 int eop = (len_left == 0); 753 dma_addr_t dma_addr; 754 int err = 0; 755 756 dma_addr = dma_map_single(&enic->pdev->dev, skb->data, head_len, 757 DMA_TO_DEVICE); 758 if (unlikely(enic_dma_map_check(enic, dma_addr))) 759 return -ENOMEM; 760 761 enic_queue_wq_desc_ex(wq, skb, dma_addr, head_len, mss_or_csum, 0, 762 vlan_tag_insert, vlan_tag, 763 WQ_ENET_OFFLOAD_MODE_CSUM, eop, 1 /* SOP */, eop, 764 loopback); 765 if (!eop) 766 err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback); 767 768 return err; 769 } 770 771 static inline int enic_queue_wq_skb(struct enic *enic, 772 struct vnic_wq *wq, struct sk_buff *skb) 773 { 774 unsigned int mss = skb_shinfo(skb)->gso_size; 775 unsigned int vlan_tag = 0; 776 int vlan_tag_insert = 0; 777 int loopback = 0; 778 int err; 779 780 if (skb_vlan_tag_present(skb)) { 781 /* VLAN tag from trunking driver */ 782 vlan_tag_insert = 1; 783 vlan_tag = skb_vlan_tag_get(skb); 784 } else if (enic->loop_enable) { 785 vlan_tag = enic->loop_tag; 786 loopback = 1; 787 } 788 789 if (mss) 790 err = enic_queue_wq_skb_tso(enic, wq, skb, mss, 791 vlan_tag_insert, vlan_tag, 792 loopback); 793 else if (skb->encapsulation) 794 err = enic_queue_wq_skb_encap(enic, wq, skb, vlan_tag_insert, 795 vlan_tag, loopback); 796 else if (skb->ip_summed == CHECKSUM_PARTIAL) 797 err = enic_queue_wq_skb_csum_l4(enic, wq, skb, vlan_tag_insert, 798 vlan_tag, loopback); 799 else 800 err = enic_queue_wq_skb_vlan(enic, wq, skb, vlan_tag_insert, 801 vlan_tag, loopback); 802 if (unlikely(err)) { 803 struct vnic_wq_buf *buf; 804 805 buf = wq->to_use->prev; 806 /* while not EOP of previous pkt && queue not empty. 807 * For all non EOP bufs, os_buf is NULL. 808 */ 809 while (!buf->os_buf && (buf->next != wq->to_clean)) { 810 enic_free_wq_buf(wq, buf); 811 wq->ring.desc_avail++; 812 buf = buf->prev; 813 } 814 wq->to_use = buf->next; 815 dev_kfree_skb(skb); 816 } 817 return err; 818 } 819 820 /* netif_tx_lock held, process context with BHs disabled, or BH */ 821 static netdev_tx_t enic_hard_start_xmit(struct sk_buff *skb, 822 struct net_device *netdev) 823 { 824 struct enic *enic = netdev_priv(netdev); 825 struct vnic_wq *wq; 826 unsigned int txq_map; 827 struct netdev_queue *txq; 828 829 if (skb->len <= 0) { 830 dev_kfree_skb_any(skb); 831 return NETDEV_TX_OK; 832 } 833 834 txq_map = skb_get_queue_mapping(skb) % enic->wq_count; 835 wq = &enic->wq[txq_map]; 836 txq = netdev_get_tx_queue(netdev, txq_map); 837 838 /* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs, 839 * which is very likely. In the off chance it's going to take 840 * more than * ENIC_NON_TSO_MAX_DESC, linearize the skb. 841 */ 842 843 if (skb_shinfo(skb)->gso_size == 0 && 844 skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC && 845 skb_linearize(skb)) { 846 dev_kfree_skb_any(skb); 847 return NETDEV_TX_OK; 848 } 849 850 spin_lock(&enic->wq_lock[txq_map]); 851 852 if (vnic_wq_desc_avail(wq) < 853 skb_shinfo(skb)->nr_frags + ENIC_DESC_MAX_SPLITS) { 854 netif_tx_stop_queue(txq); 855 /* This is a hard error, log it */ 856 netdev_err(netdev, "BUG! Tx ring full when queue awake!\n"); 857 spin_unlock(&enic->wq_lock[txq_map]); 858 return NETDEV_TX_BUSY; 859 } 860 861 if (enic_queue_wq_skb(enic, wq, skb)) 862 goto error; 863 864 if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS) 865 netif_tx_stop_queue(txq); 866 skb_tx_timestamp(skb); 867 if (!netdev_xmit_more() || netif_xmit_stopped(txq)) 868 vnic_wq_doorbell(wq); 869 870 error: 871 spin_unlock(&enic->wq_lock[txq_map]); 872 873 return NETDEV_TX_OK; 874 } 875 876 /* dev_base_lock rwlock held, nominally process context */ 877 static void enic_get_stats(struct net_device *netdev, 878 struct rtnl_link_stats64 *net_stats) 879 { 880 struct enic *enic = netdev_priv(netdev); 881 struct vnic_stats *stats; 882 int err; 883 884 err = enic_dev_stats_dump(enic, &stats); 885 /* return only when pci_zalloc_consistent fails in vnic_dev_stats_dump 886 * For other failures, like devcmd failure, we return previously 887 * recorded stats. 888 */ 889 if (err == -ENOMEM) 890 return; 891 892 net_stats->tx_packets = stats->tx.tx_frames_ok; 893 net_stats->tx_bytes = stats->tx.tx_bytes_ok; 894 net_stats->tx_errors = stats->tx.tx_errors; 895 net_stats->tx_dropped = stats->tx.tx_drops; 896 897 net_stats->rx_packets = stats->rx.rx_frames_ok; 898 net_stats->rx_bytes = stats->rx.rx_bytes_ok; 899 net_stats->rx_errors = stats->rx.rx_errors; 900 net_stats->multicast = stats->rx.rx_multicast_frames_ok; 901 net_stats->rx_over_errors = enic->rq_truncated_pkts; 902 net_stats->rx_crc_errors = enic->rq_bad_fcs; 903 net_stats->rx_dropped = stats->rx.rx_no_bufs + stats->rx.rx_drop; 904 } 905 906 static int enic_mc_sync(struct net_device *netdev, const u8 *mc_addr) 907 { 908 struct enic *enic = netdev_priv(netdev); 909 910 if (enic->mc_count == ENIC_MULTICAST_PERFECT_FILTERS) { 911 unsigned int mc_count = netdev_mc_count(netdev); 912 913 netdev_warn(netdev, "Registering only %d out of %d multicast addresses\n", 914 ENIC_MULTICAST_PERFECT_FILTERS, mc_count); 915 916 return -ENOSPC; 917 } 918 919 enic_dev_add_addr(enic, mc_addr); 920 enic->mc_count++; 921 922 return 0; 923 } 924 925 static int enic_mc_unsync(struct net_device *netdev, const u8 *mc_addr) 926 { 927 struct enic *enic = netdev_priv(netdev); 928 929 enic_dev_del_addr(enic, mc_addr); 930 enic->mc_count--; 931 932 return 0; 933 } 934 935 static int enic_uc_sync(struct net_device *netdev, const u8 *uc_addr) 936 { 937 struct enic *enic = netdev_priv(netdev); 938 939 if (enic->uc_count == ENIC_UNICAST_PERFECT_FILTERS) { 940 unsigned int uc_count = netdev_uc_count(netdev); 941 942 netdev_warn(netdev, "Registering only %d out of %d unicast addresses\n", 943 ENIC_UNICAST_PERFECT_FILTERS, uc_count); 944 945 return -ENOSPC; 946 } 947 948 enic_dev_add_addr(enic, uc_addr); 949 enic->uc_count++; 950 951 return 0; 952 } 953 954 static int enic_uc_unsync(struct net_device *netdev, const u8 *uc_addr) 955 { 956 struct enic *enic = netdev_priv(netdev); 957 958 enic_dev_del_addr(enic, uc_addr); 959 enic->uc_count--; 960 961 return 0; 962 } 963 964 void enic_reset_addr_lists(struct enic *enic) 965 { 966 struct net_device *netdev = enic->netdev; 967 968 __dev_uc_unsync(netdev, NULL); 969 __dev_mc_unsync(netdev, NULL); 970 971 enic->mc_count = 0; 972 enic->uc_count = 0; 973 enic->flags = 0; 974 } 975 976 static int enic_set_mac_addr(struct net_device *netdev, char *addr) 977 { 978 struct enic *enic = netdev_priv(netdev); 979 980 if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) { 981 if (!is_valid_ether_addr(addr) && !is_zero_ether_addr(addr)) 982 return -EADDRNOTAVAIL; 983 } else { 984 if (!is_valid_ether_addr(addr)) 985 return -EADDRNOTAVAIL; 986 } 987 988 memcpy(netdev->dev_addr, addr, netdev->addr_len); 989 990 return 0; 991 } 992 993 static int enic_set_mac_address_dynamic(struct net_device *netdev, void *p) 994 { 995 struct enic *enic = netdev_priv(netdev); 996 struct sockaddr *saddr = p; 997 char *addr = saddr->sa_data; 998 int err; 999 1000 if (netif_running(enic->netdev)) { 1001 err = enic_dev_del_station_addr(enic); 1002 if (err) 1003 return err; 1004 } 1005 1006 err = enic_set_mac_addr(netdev, addr); 1007 if (err) 1008 return err; 1009 1010 if (netif_running(enic->netdev)) { 1011 err = enic_dev_add_station_addr(enic); 1012 if (err) 1013 return err; 1014 } 1015 1016 return err; 1017 } 1018 1019 static int enic_set_mac_address(struct net_device *netdev, void *p) 1020 { 1021 struct sockaddr *saddr = p; 1022 char *addr = saddr->sa_data; 1023 struct enic *enic = netdev_priv(netdev); 1024 int err; 1025 1026 err = enic_dev_del_station_addr(enic); 1027 if (err) 1028 return err; 1029 1030 err = enic_set_mac_addr(netdev, addr); 1031 if (err) 1032 return err; 1033 1034 return enic_dev_add_station_addr(enic); 1035 } 1036 1037 /* netif_tx_lock held, BHs disabled */ 1038 static void enic_set_rx_mode(struct net_device *netdev) 1039 { 1040 struct enic *enic = netdev_priv(netdev); 1041 int directed = 1; 1042 int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0; 1043 int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0; 1044 int promisc = (netdev->flags & IFF_PROMISC) || 1045 netdev_uc_count(netdev) > ENIC_UNICAST_PERFECT_FILTERS; 1046 int allmulti = (netdev->flags & IFF_ALLMULTI) || 1047 netdev_mc_count(netdev) > ENIC_MULTICAST_PERFECT_FILTERS; 1048 unsigned int flags = netdev->flags | 1049 (allmulti ? IFF_ALLMULTI : 0) | 1050 (promisc ? IFF_PROMISC : 0); 1051 1052 if (enic->flags != flags) { 1053 enic->flags = flags; 1054 enic_dev_packet_filter(enic, directed, 1055 multicast, broadcast, promisc, allmulti); 1056 } 1057 1058 if (!promisc) { 1059 __dev_uc_sync(netdev, enic_uc_sync, enic_uc_unsync); 1060 if (!allmulti) 1061 __dev_mc_sync(netdev, enic_mc_sync, enic_mc_unsync); 1062 } 1063 } 1064 1065 /* netif_tx_lock held, BHs disabled */ 1066 static void enic_tx_timeout(struct net_device *netdev, unsigned int txqueue) 1067 { 1068 struct enic *enic = netdev_priv(netdev); 1069 schedule_work(&enic->tx_hang_reset); 1070 } 1071 1072 static int enic_set_vf_mac(struct net_device *netdev, int vf, u8 *mac) 1073 { 1074 struct enic *enic = netdev_priv(netdev); 1075 struct enic_port_profile *pp; 1076 int err; 1077 1078 ENIC_PP_BY_INDEX(enic, vf, pp, &err); 1079 if (err) 1080 return err; 1081 1082 if (is_valid_ether_addr(mac) || is_zero_ether_addr(mac)) { 1083 if (vf == PORT_SELF_VF) { 1084 memcpy(pp->vf_mac, mac, ETH_ALEN); 1085 return 0; 1086 } else { 1087 /* 1088 * For sriov vf's set the mac in hw 1089 */ 1090 ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic, 1091 vnic_dev_set_mac_addr, mac); 1092 return enic_dev_status_to_errno(err); 1093 } 1094 } else 1095 return -EINVAL; 1096 } 1097 1098 static int enic_set_vf_port(struct net_device *netdev, int vf, 1099 struct nlattr *port[]) 1100 { 1101 struct enic *enic = netdev_priv(netdev); 1102 struct enic_port_profile prev_pp; 1103 struct enic_port_profile *pp; 1104 int err = 0, restore_pp = 1; 1105 1106 ENIC_PP_BY_INDEX(enic, vf, pp, &err); 1107 if (err) 1108 return err; 1109 1110 if (!port[IFLA_PORT_REQUEST]) 1111 return -EOPNOTSUPP; 1112 1113 memcpy(&prev_pp, pp, sizeof(*enic->pp)); 1114 memset(pp, 0, sizeof(*enic->pp)); 1115 1116 pp->set |= ENIC_SET_REQUEST; 1117 pp->request = nla_get_u8(port[IFLA_PORT_REQUEST]); 1118 1119 if (port[IFLA_PORT_PROFILE]) { 1120 pp->set |= ENIC_SET_NAME; 1121 memcpy(pp->name, nla_data(port[IFLA_PORT_PROFILE]), 1122 PORT_PROFILE_MAX); 1123 } 1124 1125 if (port[IFLA_PORT_INSTANCE_UUID]) { 1126 pp->set |= ENIC_SET_INSTANCE; 1127 memcpy(pp->instance_uuid, 1128 nla_data(port[IFLA_PORT_INSTANCE_UUID]), PORT_UUID_MAX); 1129 } 1130 1131 if (port[IFLA_PORT_HOST_UUID]) { 1132 pp->set |= ENIC_SET_HOST; 1133 memcpy(pp->host_uuid, 1134 nla_data(port[IFLA_PORT_HOST_UUID]), PORT_UUID_MAX); 1135 } 1136 1137 if (vf == PORT_SELF_VF) { 1138 /* Special case handling: mac came from IFLA_VF_MAC */ 1139 if (!is_zero_ether_addr(prev_pp.vf_mac)) 1140 memcpy(pp->mac_addr, prev_pp.vf_mac, ETH_ALEN); 1141 1142 if (is_zero_ether_addr(netdev->dev_addr)) 1143 eth_hw_addr_random(netdev); 1144 } else { 1145 /* SR-IOV VF: get mac from adapter */ 1146 ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic, 1147 vnic_dev_get_mac_addr, pp->mac_addr); 1148 if (err) { 1149 netdev_err(netdev, "Error getting mac for vf %d\n", vf); 1150 memcpy(pp, &prev_pp, sizeof(*pp)); 1151 return enic_dev_status_to_errno(err); 1152 } 1153 } 1154 1155 err = enic_process_set_pp_request(enic, vf, &prev_pp, &restore_pp); 1156 if (err) { 1157 if (restore_pp) { 1158 /* Things are still the way they were: Implicit 1159 * DISASSOCIATE failed 1160 */ 1161 memcpy(pp, &prev_pp, sizeof(*pp)); 1162 } else { 1163 memset(pp, 0, sizeof(*pp)); 1164 if (vf == PORT_SELF_VF) 1165 eth_zero_addr(netdev->dev_addr); 1166 } 1167 } else { 1168 /* Set flag to indicate that the port assoc/disassoc 1169 * request has been sent out to fw 1170 */ 1171 pp->set |= ENIC_PORT_REQUEST_APPLIED; 1172 1173 /* If DISASSOCIATE, clean up all assigned/saved macaddresses */ 1174 if (pp->request == PORT_REQUEST_DISASSOCIATE) { 1175 eth_zero_addr(pp->mac_addr); 1176 if (vf == PORT_SELF_VF) 1177 eth_zero_addr(netdev->dev_addr); 1178 } 1179 } 1180 1181 if (vf == PORT_SELF_VF) 1182 eth_zero_addr(pp->vf_mac); 1183 1184 return err; 1185 } 1186 1187 static int enic_get_vf_port(struct net_device *netdev, int vf, 1188 struct sk_buff *skb) 1189 { 1190 struct enic *enic = netdev_priv(netdev); 1191 u16 response = PORT_PROFILE_RESPONSE_SUCCESS; 1192 struct enic_port_profile *pp; 1193 int err; 1194 1195 ENIC_PP_BY_INDEX(enic, vf, pp, &err); 1196 if (err) 1197 return err; 1198 1199 if (!(pp->set & ENIC_PORT_REQUEST_APPLIED)) 1200 return -ENODATA; 1201 1202 err = enic_process_get_pp_request(enic, vf, pp->request, &response); 1203 if (err) 1204 return err; 1205 1206 if (nla_put_u16(skb, IFLA_PORT_REQUEST, pp->request) || 1207 nla_put_u16(skb, IFLA_PORT_RESPONSE, response) || 1208 ((pp->set & ENIC_SET_NAME) && 1209 nla_put(skb, IFLA_PORT_PROFILE, PORT_PROFILE_MAX, pp->name)) || 1210 ((pp->set & ENIC_SET_INSTANCE) && 1211 nla_put(skb, IFLA_PORT_INSTANCE_UUID, PORT_UUID_MAX, 1212 pp->instance_uuid)) || 1213 ((pp->set & ENIC_SET_HOST) && 1214 nla_put(skb, IFLA_PORT_HOST_UUID, PORT_UUID_MAX, pp->host_uuid))) 1215 goto nla_put_failure; 1216 return 0; 1217 1218 nla_put_failure: 1219 return -EMSGSIZE; 1220 } 1221 1222 static void enic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf) 1223 { 1224 struct enic *enic = vnic_dev_priv(rq->vdev); 1225 1226 if (!buf->os_buf) 1227 return; 1228 1229 dma_unmap_single(&enic->pdev->dev, buf->dma_addr, buf->len, 1230 DMA_FROM_DEVICE); 1231 dev_kfree_skb_any(buf->os_buf); 1232 buf->os_buf = NULL; 1233 } 1234 1235 static int enic_rq_alloc_buf(struct vnic_rq *rq) 1236 { 1237 struct enic *enic = vnic_dev_priv(rq->vdev); 1238 struct net_device *netdev = enic->netdev; 1239 struct sk_buff *skb; 1240 unsigned int len = netdev->mtu + VLAN_ETH_HLEN; 1241 unsigned int os_buf_index = 0; 1242 dma_addr_t dma_addr; 1243 struct vnic_rq_buf *buf = rq->to_use; 1244 1245 if (buf->os_buf) { 1246 enic_queue_rq_desc(rq, buf->os_buf, os_buf_index, buf->dma_addr, 1247 buf->len); 1248 1249 return 0; 1250 } 1251 skb = netdev_alloc_skb_ip_align(netdev, len); 1252 if (!skb) 1253 return -ENOMEM; 1254 1255 dma_addr = dma_map_single(&enic->pdev->dev, skb->data, len, 1256 DMA_FROM_DEVICE); 1257 if (unlikely(enic_dma_map_check(enic, dma_addr))) { 1258 dev_kfree_skb(skb); 1259 return -ENOMEM; 1260 } 1261 1262 enic_queue_rq_desc(rq, skb, os_buf_index, 1263 dma_addr, len); 1264 1265 return 0; 1266 } 1267 1268 static void enic_intr_update_pkt_size(struct vnic_rx_bytes_counter *pkt_size, 1269 u32 pkt_len) 1270 { 1271 if (ENIC_LARGE_PKT_THRESHOLD <= pkt_len) 1272 pkt_size->large_pkt_bytes_cnt += pkt_len; 1273 else 1274 pkt_size->small_pkt_bytes_cnt += pkt_len; 1275 } 1276 1277 static bool enic_rxcopybreak(struct net_device *netdev, struct sk_buff **skb, 1278 struct vnic_rq_buf *buf, u16 len) 1279 { 1280 struct enic *enic = netdev_priv(netdev); 1281 struct sk_buff *new_skb; 1282 1283 if (len > enic->rx_copybreak) 1284 return false; 1285 new_skb = netdev_alloc_skb_ip_align(netdev, len); 1286 if (!new_skb) 1287 return false; 1288 dma_sync_single_for_cpu(&enic->pdev->dev, buf->dma_addr, len, 1289 DMA_FROM_DEVICE); 1290 memcpy(new_skb->data, (*skb)->data, len); 1291 *skb = new_skb; 1292 1293 return true; 1294 } 1295 1296 static void enic_rq_indicate_buf(struct vnic_rq *rq, 1297 struct cq_desc *cq_desc, struct vnic_rq_buf *buf, 1298 int skipped, void *opaque) 1299 { 1300 struct enic *enic = vnic_dev_priv(rq->vdev); 1301 struct net_device *netdev = enic->netdev; 1302 struct sk_buff *skb; 1303 struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)]; 1304 1305 u8 type, color, eop, sop, ingress_port, vlan_stripped; 1306 u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof; 1307 u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok; 1308 u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc; 1309 u8 packet_error; 1310 u16 q_number, completed_index, bytes_written, vlan_tci, checksum; 1311 u32 rss_hash; 1312 bool outer_csum_ok = true, encap = false; 1313 1314 if (skipped) 1315 return; 1316 1317 skb = buf->os_buf; 1318 1319 cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc, 1320 &type, &color, &q_number, &completed_index, 1321 &ingress_port, &fcoe, &eop, &sop, &rss_type, 1322 &csum_not_calc, &rss_hash, &bytes_written, 1323 &packet_error, &vlan_stripped, &vlan_tci, &checksum, 1324 &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error, 1325 &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp, 1326 &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment, 1327 &fcs_ok); 1328 1329 if (packet_error) { 1330 1331 if (!fcs_ok) { 1332 if (bytes_written > 0) 1333 enic->rq_bad_fcs++; 1334 else if (bytes_written == 0) 1335 enic->rq_truncated_pkts++; 1336 } 1337 1338 dma_unmap_single(&enic->pdev->dev, buf->dma_addr, buf->len, 1339 DMA_FROM_DEVICE); 1340 dev_kfree_skb_any(skb); 1341 buf->os_buf = NULL; 1342 1343 return; 1344 } 1345 1346 if (eop && bytes_written > 0) { 1347 1348 /* Good receive 1349 */ 1350 1351 if (!enic_rxcopybreak(netdev, &skb, buf, bytes_written)) { 1352 buf->os_buf = NULL; 1353 dma_unmap_single(&enic->pdev->dev, buf->dma_addr, 1354 buf->len, DMA_FROM_DEVICE); 1355 } 1356 prefetch(skb->data - NET_IP_ALIGN); 1357 1358 skb_put(skb, bytes_written); 1359 skb->protocol = eth_type_trans(skb, netdev); 1360 skb_record_rx_queue(skb, q_number); 1361 if ((netdev->features & NETIF_F_RXHASH) && rss_hash && 1362 (type == 3)) { 1363 switch (rss_type) { 1364 case CQ_ENET_RQ_DESC_RSS_TYPE_TCP_IPv4: 1365 case CQ_ENET_RQ_DESC_RSS_TYPE_TCP_IPv6: 1366 case CQ_ENET_RQ_DESC_RSS_TYPE_TCP_IPv6_EX: 1367 skb_set_hash(skb, rss_hash, PKT_HASH_TYPE_L4); 1368 break; 1369 case CQ_ENET_RQ_DESC_RSS_TYPE_IPv4: 1370 case CQ_ENET_RQ_DESC_RSS_TYPE_IPv6: 1371 case CQ_ENET_RQ_DESC_RSS_TYPE_IPv6_EX: 1372 skb_set_hash(skb, rss_hash, PKT_HASH_TYPE_L3); 1373 break; 1374 } 1375 } 1376 if (enic->vxlan.vxlan_udp_port_number) { 1377 switch (enic->vxlan.patch_level) { 1378 case 0: 1379 if (fcoe) { 1380 encap = true; 1381 outer_csum_ok = fcoe_fc_crc_ok; 1382 } 1383 break; 1384 case 2: 1385 if ((type == 7) && 1386 (rss_hash & BIT(0))) { 1387 encap = true; 1388 outer_csum_ok = (rss_hash & BIT(1)) && 1389 (rss_hash & BIT(2)); 1390 } 1391 break; 1392 } 1393 } 1394 1395 /* Hardware does not provide whole packet checksum. It only 1396 * provides pseudo checksum. Since hw validates the packet 1397 * checksum but not provide us the checksum value. use 1398 * CHECSUM_UNNECESSARY. 1399 * 1400 * In case of encap pkt tcp_udp_csum_ok/tcp_udp_csum_ok is 1401 * inner csum_ok. outer_csum_ok is set by hw when outer udp 1402 * csum is correct or is zero. 1403 */ 1404 if ((netdev->features & NETIF_F_RXCSUM) && !csum_not_calc && 1405 tcp_udp_csum_ok && outer_csum_ok && 1406 (ipv4_csum_ok || ipv6)) { 1407 skb->ip_summed = CHECKSUM_UNNECESSARY; 1408 skb->csum_level = encap; 1409 } 1410 1411 if (vlan_stripped) 1412 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci); 1413 1414 skb_mark_napi_id(skb, &enic->napi[rq->index]); 1415 if (!(netdev->features & NETIF_F_GRO)) 1416 netif_receive_skb(skb); 1417 else 1418 napi_gro_receive(&enic->napi[q_number], skb); 1419 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce) 1420 enic_intr_update_pkt_size(&cq->pkt_size_counter, 1421 bytes_written); 1422 } else { 1423 1424 /* Buffer overflow 1425 */ 1426 1427 dma_unmap_single(&enic->pdev->dev, buf->dma_addr, buf->len, 1428 DMA_FROM_DEVICE); 1429 dev_kfree_skb_any(skb); 1430 buf->os_buf = NULL; 1431 } 1432 } 1433 1434 static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc, 1435 u8 type, u16 q_number, u16 completed_index, void *opaque) 1436 { 1437 struct enic *enic = vnic_dev_priv(vdev); 1438 1439 vnic_rq_service(&enic->rq[q_number], cq_desc, 1440 completed_index, VNIC_RQ_RETURN_DESC, 1441 enic_rq_indicate_buf, opaque); 1442 1443 return 0; 1444 } 1445 1446 static void enic_set_int_moderation(struct enic *enic, struct vnic_rq *rq) 1447 { 1448 unsigned int intr = enic_msix_rq_intr(enic, rq->index); 1449 struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)]; 1450 u32 timer = cq->tobe_rx_coal_timeval; 1451 1452 if (cq->tobe_rx_coal_timeval != cq->cur_rx_coal_timeval) { 1453 vnic_intr_coalescing_timer_set(&enic->intr[intr], timer); 1454 cq->cur_rx_coal_timeval = cq->tobe_rx_coal_timeval; 1455 } 1456 } 1457 1458 static void enic_calc_int_moderation(struct enic *enic, struct vnic_rq *rq) 1459 { 1460 struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting; 1461 struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)]; 1462 struct vnic_rx_bytes_counter *pkt_size_counter = &cq->pkt_size_counter; 1463 int index; 1464 u32 timer; 1465 u32 range_start; 1466 u32 traffic; 1467 u64 delta; 1468 ktime_t now = ktime_get(); 1469 1470 delta = ktime_us_delta(now, cq->prev_ts); 1471 if (delta < ENIC_AIC_TS_BREAK) 1472 return; 1473 cq->prev_ts = now; 1474 1475 traffic = pkt_size_counter->large_pkt_bytes_cnt + 1476 pkt_size_counter->small_pkt_bytes_cnt; 1477 /* The table takes Mbps 1478 * traffic *= 8 => bits 1479 * traffic *= (10^6 / delta) => bps 1480 * traffic /= 10^6 => Mbps 1481 * 1482 * Combining, traffic *= (8 / delta) 1483 */ 1484 1485 traffic <<= 3; 1486 traffic = delta > UINT_MAX ? 0 : traffic / (u32)delta; 1487 1488 for (index = 0; index < ENIC_MAX_COALESCE_TIMERS; index++) 1489 if (traffic < mod_table[index].rx_rate) 1490 break; 1491 range_start = (pkt_size_counter->small_pkt_bytes_cnt > 1492 pkt_size_counter->large_pkt_bytes_cnt << 1) ? 1493 rx_coal->small_pkt_range_start : 1494 rx_coal->large_pkt_range_start; 1495 timer = range_start + ((rx_coal->range_end - range_start) * 1496 mod_table[index].range_percent / 100); 1497 /* Damping */ 1498 cq->tobe_rx_coal_timeval = (timer + cq->tobe_rx_coal_timeval) >> 1; 1499 1500 pkt_size_counter->large_pkt_bytes_cnt = 0; 1501 pkt_size_counter->small_pkt_bytes_cnt = 0; 1502 } 1503 1504 static int enic_poll(struct napi_struct *napi, int budget) 1505 { 1506 struct net_device *netdev = napi->dev; 1507 struct enic *enic = netdev_priv(netdev); 1508 unsigned int cq_rq = enic_cq_rq(enic, 0); 1509 unsigned int cq_wq = enic_cq_wq(enic, 0); 1510 unsigned int intr = enic_legacy_io_intr(); 1511 unsigned int rq_work_to_do = budget; 1512 unsigned int wq_work_to_do = ENIC_WQ_NAPI_BUDGET; 1513 unsigned int work_done, rq_work_done = 0, wq_work_done; 1514 int err; 1515 1516 wq_work_done = vnic_cq_service(&enic->cq[cq_wq], wq_work_to_do, 1517 enic_wq_service, NULL); 1518 1519 if (budget > 0) 1520 rq_work_done = vnic_cq_service(&enic->cq[cq_rq], 1521 rq_work_to_do, enic_rq_service, NULL); 1522 1523 /* Accumulate intr event credits for this polling 1524 * cycle. An intr event is the completion of a 1525 * a WQ or RQ packet. 1526 */ 1527 1528 work_done = rq_work_done + wq_work_done; 1529 1530 if (work_done > 0) 1531 vnic_intr_return_credits(&enic->intr[intr], 1532 work_done, 1533 0 /* don't unmask intr */, 1534 0 /* don't reset intr timer */); 1535 1536 err = vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf); 1537 1538 /* Buffer allocation failed. Stay in polling 1539 * mode so we can try to fill the ring again. 1540 */ 1541 1542 if (err) 1543 rq_work_done = rq_work_to_do; 1544 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce) 1545 /* Call the function which refreshes the intr coalescing timer 1546 * value based on the traffic. 1547 */ 1548 enic_calc_int_moderation(enic, &enic->rq[0]); 1549 1550 if ((rq_work_done < budget) && napi_complete_done(napi, rq_work_done)) { 1551 1552 /* Some work done, but not enough to stay in polling, 1553 * exit polling 1554 */ 1555 1556 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce) 1557 enic_set_int_moderation(enic, &enic->rq[0]); 1558 vnic_intr_unmask(&enic->intr[intr]); 1559 } 1560 1561 return rq_work_done; 1562 } 1563 1564 #ifdef CONFIG_RFS_ACCEL 1565 static void enic_free_rx_cpu_rmap(struct enic *enic) 1566 { 1567 free_irq_cpu_rmap(enic->netdev->rx_cpu_rmap); 1568 enic->netdev->rx_cpu_rmap = NULL; 1569 } 1570 1571 static void enic_set_rx_cpu_rmap(struct enic *enic) 1572 { 1573 int i, res; 1574 1575 if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) { 1576 enic->netdev->rx_cpu_rmap = alloc_irq_cpu_rmap(enic->rq_count); 1577 if (unlikely(!enic->netdev->rx_cpu_rmap)) 1578 return; 1579 for (i = 0; i < enic->rq_count; i++) { 1580 res = irq_cpu_rmap_add(enic->netdev->rx_cpu_rmap, 1581 enic->msix_entry[i].vector); 1582 if (unlikely(res)) { 1583 enic_free_rx_cpu_rmap(enic); 1584 return; 1585 } 1586 } 1587 } 1588 } 1589 1590 #else 1591 1592 static void enic_free_rx_cpu_rmap(struct enic *enic) 1593 { 1594 } 1595 1596 static void enic_set_rx_cpu_rmap(struct enic *enic) 1597 { 1598 } 1599 1600 #endif /* CONFIG_RFS_ACCEL */ 1601 1602 static int enic_poll_msix_wq(struct napi_struct *napi, int budget) 1603 { 1604 struct net_device *netdev = napi->dev; 1605 struct enic *enic = netdev_priv(netdev); 1606 unsigned int wq_index = (napi - &enic->napi[0]) - enic->rq_count; 1607 struct vnic_wq *wq = &enic->wq[wq_index]; 1608 unsigned int cq; 1609 unsigned int intr; 1610 unsigned int wq_work_to_do = ENIC_WQ_NAPI_BUDGET; 1611 unsigned int wq_work_done; 1612 unsigned int wq_irq; 1613 1614 wq_irq = wq->index; 1615 cq = enic_cq_wq(enic, wq_irq); 1616 intr = enic_msix_wq_intr(enic, wq_irq); 1617 wq_work_done = vnic_cq_service(&enic->cq[cq], wq_work_to_do, 1618 enic_wq_service, NULL); 1619 1620 vnic_intr_return_credits(&enic->intr[intr], wq_work_done, 1621 0 /* don't unmask intr */, 1622 1 /* reset intr timer */); 1623 if (!wq_work_done) { 1624 napi_complete(napi); 1625 vnic_intr_unmask(&enic->intr[intr]); 1626 return 0; 1627 } 1628 1629 return budget; 1630 } 1631 1632 static int enic_poll_msix_rq(struct napi_struct *napi, int budget) 1633 { 1634 struct net_device *netdev = napi->dev; 1635 struct enic *enic = netdev_priv(netdev); 1636 unsigned int rq = (napi - &enic->napi[0]); 1637 unsigned int cq = enic_cq_rq(enic, rq); 1638 unsigned int intr = enic_msix_rq_intr(enic, rq); 1639 unsigned int work_to_do = budget; 1640 unsigned int work_done = 0; 1641 int err; 1642 1643 /* Service RQ 1644 */ 1645 1646 if (budget > 0) 1647 work_done = vnic_cq_service(&enic->cq[cq], 1648 work_to_do, enic_rq_service, NULL); 1649 1650 /* Return intr event credits for this polling 1651 * cycle. An intr event is the completion of a 1652 * RQ packet. 1653 */ 1654 1655 if (work_done > 0) 1656 vnic_intr_return_credits(&enic->intr[intr], 1657 work_done, 1658 0 /* don't unmask intr */, 1659 0 /* don't reset intr timer */); 1660 1661 err = vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf); 1662 1663 /* Buffer allocation failed. Stay in polling mode 1664 * so we can try to fill the ring again. 1665 */ 1666 1667 if (err) 1668 work_done = work_to_do; 1669 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce) 1670 /* Call the function which refreshes the intr coalescing timer 1671 * value based on the traffic. 1672 */ 1673 enic_calc_int_moderation(enic, &enic->rq[rq]); 1674 1675 if ((work_done < budget) && napi_complete_done(napi, work_done)) { 1676 1677 /* Some work done, but not enough to stay in polling, 1678 * exit polling 1679 */ 1680 1681 if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce) 1682 enic_set_int_moderation(enic, &enic->rq[rq]); 1683 vnic_intr_unmask(&enic->intr[intr]); 1684 } 1685 1686 return work_done; 1687 } 1688 1689 static void enic_notify_timer(struct timer_list *t) 1690 { 1691 struct enic *enic = from_timer(enic, t, notify_timer); 1692 1693 enic_notify_check(enic); 1694 1695 mod_timer(&enic->notify_timer, 1696 round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD)); 1697 } 1698 1699 static void enic_free_intr(struct enic *enic) 1700 { 1701 struct net_device *netdev = enic->netdev; 1702 unsigned int i; 1703 1704 enic_free_rx_cpu_rmap(enic); 1705 switch (vnic_dev_get_intr_mode(enic->vdev)) { 1706 case VNIC_DEV_INTR_MODE_INTX: 1707 free_irq(enic->pdev->irq, netdev); 1708 break; 1709 case VNIC_DEV_INTR_MODE_MSI: 1710 free_irq(enic->pdev->irq, enic); 1711 break; 1712 case VNIC_DEV_INTR_MODE_MSIX: 1713 for (i = 0; i < ARRAY_SIZE(enic->msix); i++) 1714 if (enic->msix[i].requested) 1715 free_irq(enic->msix_entry[i].vector, 1716 enic->msix[i].devid); 1717 break; 1718 default: 1719 break; 1720 } 1721 } 1722 1723 static int enic_request_intr(struct enic *enic) 1724 { 1725 struct net_device *netdev = enic->netdev; 1726 unsigned int i, intr; 1727 int err = 0; 1728 1729 enic_set_rx_cpu_rmap(enic); 1730 switch (vnic_dev_get_intr_mode(enic->vdev)) { 1731 1732 case VNIC_DEV_INTR_MODE_INTX: 1733 1734 err = request_irq(enic->pdev->irq, enic_isr_legacy, 1735 IRQF_SHARED, netdev->name, netdev); 1736 break; 1737 1738 case VNIC_DEV_INTR_MODE_MSI: 1739 1740 err = request_irq(enic->pdev->irq, enic_isr_msi, 1741 0, netdev->name, enic); 1742 break; 1743 1744 case VNIC_DEV_INTR_MODE_MSIX: 1745 1746 for (i = 0; i < enic->rq_count; i++) { 1747 intr = enic_msix_rq_intr(enic, i); 1748 snprintf(enic->msix[intr].devname, 1749 sizeof(enic->msix[intr].devname), 1750 "%s-rx-%u", netdev->name, i); 1751 enic->msix[intr].isr = enic_isr_msix; 1752 enic->msix[intr].devid = &enic->napi[i]; 1753 } 1754 1755 for (i = 0; i < enic->wq_count; i++) { 1756 int wq = enic_cq_wq(enic, i); 1757 1758 intr = enic_msix_wq_intr(enic, i); 1759 snprintf(enic->msix[intr].devname, 1760 sizeof(enic->msix[intr].devname), 1761 "%s-tx-%u", netdev->name, i); 1762 enic->msix[intr].isr = enic_isr_msix; 1763 enic->msix[intr].devid = &enic->napi[wq]; 1764 } 1765 1766 intr = enic_msix_err_intr(enic); 1767 snprintf(enic->msix[intr].devname, 1768 sizeof(enic->msix[intr].devname), 1769 "%s-err", netdev->name); 1770 enic->msix[intr].isr = enic_isr_msix_err; 1771 enic->msix[intr].devid = enic; 1772 1773 intr = enic_msix_notify_intr(enic); 1774 snprintf(enic->msix[intr].devname, 1775 sizeof(enic->msix[intr].devname), 1776 "%s-notify", netdev->name); 1777 enic->msix[intr].isr = enic_isr_msix_notify; 1778 enic->msix[intr].devid = enic; 1779 1780 for (i = 0; i < ARRAY_SIZE(enic->msix); i++) 1781 enic->msix[i].requested = 0; 1782 1783 for (i = 0; i < enic->intr_count; i++) { 1784 err = request_irq(enic->msix_entry[i].vector, 1785 enic->msix[i].isr, 0, 1786 enic->msix[i].devname, 1787 enic->msix[i].devid); 1788 if (err) { 1789 enic_free_intr(enic); 1790 break; 1791 } 1792 enic->msix[i].requested = 1; 1793 } 1794 1795 break; 1796 1797 default: 1798 break; 1799 } 1800 1801 return err; 1802 } 1803 1804 static void enic_synchronize_irqs(struct enic *enic) 1805 { 1806 unsigned int i; 1807 1808 switch (vnic_dev_get_intr_mode(enic->vdev)) { 1809 case VNIC_DEV_INTR_MODE_INTX: 1810 case VNIC_DEV_INTR_MODE_MSI: 1811 synchronize_irq(enic->pdev->irq); 1812 break; 1813 case VNIC_DEV_INTR_MODE_MSIX: 1814 for (i = 0; i < enic->intr_count; i++) 1815 synchronize_irq(enic->msix_entry[i].vector); 1816 break; 1817 default: 1818 break; 1819 } 1820 } 1821 1822 static void enic_set_rx_coal_setting(struct enic *enic) 1823 { 1824 unsigned int speed; 1825 int index = -1; 1826 struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting; 1827 1828 /* 1. Read the link speed from fw 1829 * 2. Pick the default range for the speed 1830 * 3. Update it in enic->rx_coalesce_setting 1831 */ 1832 speed = vnic_dev_port_speed(enic->vdev); 1833 if (ENIC_LINK_SPEED_10G < speed) 1834 index = ENIC_LINK_40G_INDEX; 1835 else if (ENIC_LINK_SPEED_4G < speed) 1836 index = ENIC_LINK_10G_INDEX; 1837 else 1838 index = ENIC_LINK_4G_INDEX; 1839 1840 rx_coal->small_pkt_range_start = mod_range[index].small_pkt_range_start; 1841 rx_coal->large_pkt_range_start = mod_range[index].large_pkt_range_start; 1842 rx_coal->range_end = ENIC_RX_COALESCE_RANGE_END; 1843 1844 /* Start with the value provided by UCSM */ 1845 for (index = 0; index < enic->rq_count; index++) 1846 enic->cq[index].cur_rx_coal_timeval = 1847 enic->config.intr_timer_usec; 1848 1849 rx_coal->use_adaptive_rx_coalesce = 1; 1850 } 1851 1852 static int enic_dev_notify_set(struct enic *enic) 1853 { 1854 int err; 1855 1856 spin_lock_bh(&enic->devcmd_lock); 1857 switch (vnic_dev_get_intr_mode(enic->vdev)) { 1858 case VNIC_DEV_INTR_MODE_INTX: 1859 err = vnic_dev_notify_set(enic->vdev, 1860 enic_legacy_notify_intr()); 1861 break; 1862 case VNIC_DEV_INTR_MODE_MSIX: 1863 err = vnic_dev_notify_set(enic->vdev, 1864 enic_msix_notify_intr(enic)); 1865 break; 1866 default: 1867 err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */); 1868 break; 1869 } 1870 spin_unlock_bh(&enic->devcmd_lock); 1871 1872 return err; 1873 } 1874 1875 static void enic_notify_timer_start(struct enic *enic) 1876 { 1877 switch (vnic_dev_get_intr_mode(enic->vdev)) { 1878 case VNIC_DEV_INTR_MODE_MSI: 1879 mod_timer(&enic->notify_timer, jiffies); 1880 break; 1881 default: 1882 /* Using intr for notification for INTx/MSI-X */ 1883 break; 1884 } 1885 } 1886 1887 /* rtnl lock is held, process context */ 1888 static int enic_open(struct net_device *netdev) 1889 { 1890 struct enic *enic = netdev_priv(netdev); 1891 unsigned int i; 1892 int err, ret; 1893 1894 err = enic_request_intr(enic); 1895 if (err) { 1896 netdev_err(netdev, "Unable to request irq.\n"); 1897 return err; 1898 } 1899 enic_init_affinity_hint(enic); 1900 enic_set_affinity_hint(enic); 1901 1902 err = enic_dev_notify_set(enic); 1903 if (err) { 1904 netdev_err(netdev, 1905 "Failed to alloc notify buffer, aborting.\n"); 1906 goto err_out_free_intr; 1907 } 1908 1909 for (i = 0; i < enic->rq_count; i++) { 1910 /* enable rq before updating rq desc */ 1911 vnic_rq_enable(&enic->rq[i]); 1912 vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf); 1913 /* Need at least one buffer on ring to get going */ 1914 if (vnic_rq_desc_used(&enic->rq[i]) == 0) { 1915 netdev_err(netdev, "Unable to alloc receive buffers\n"); 1916 err = -ENOMEM; 1917 goto err_out_free_rq; 1918 } 1919 } 1920 1921 for (i = 0; i < enic->wq_count; i++) 1922 vnic_wq_enable(&enic->wq[i]); 1923 1924 if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic)) 1925 enic_dev_add_station_addr(enic); 1926 1927 enic_set_rx_mode(netdev); 1928 1929 netif_tx_wake_all_queues(netdev); 1930 1931 for (i = 0; i < enic->rq_count; i++) 1932 napi_enable(&enic->napi[i]); 1933 1934 if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) 1935 for (i = 0; i < enic->wq_count; i++) 1936 napi_enable(&enic->napi[enic_cq_wq(enic, i)]); 1937 enic_dev_enable(enic); 1938 1939 for (i = 0; i < enic->intr_count; i++) 1940 vnic_intr_unmask(&enic->intr[i]); 1941 1942 enic_notify_timer_start(enic); 1943 enic_rfs_timer_start(enic); 1944 1945 return 0; 1946 1947 err_out_free_rq: 1948 for (i = 0; i < enic->rq_count; i++) { 1949 ret = vnic_rq_disable(&enic->rq[i]); 1950 if (!ret) 1951 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf); 1952 } 1953 enic_dev_notify_unset(enic); 1954 err_out_free_intr: 1955 enic_unset_affinity_hint(enic); 1956 enic_free_intr(enic); 1957 1958 return err; 1959 } 1960 1961 /* rtnl lock is held, process context */ 1962 static int enic_stop(struct net_device *netdev) 1963 { 1964 struct enic *enic = netdev_priv(netdev); 1965 unsigned int i; 1966 int err; 1967 1968 for (i = 0; i < enic->intr_count; i++) { 1969 vnic_intr_mask(&enic->intr[i]); 1970 (void)vnic_intr_masked(&enic->intr[i]); /* flush write */ 1971 } 1972 1973 enic_synchronize_irqs(enic); 1974 1975 del_timer_sync(&enic->notify_timer); 1976 enic_rfs_flw_tbl_free(enic); 1977 1978 enic_dev_disable(enic); 1979 1980 for (i = 0; i < enic->rq_count; i++) 1981 napi_disable(&enic->napi[i]); 1982 1983 netif_carrier_off(netdev); 1984 if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) 1985 for (i = 0; i < enic->wq_count; i++) 1986 napi_disable(&enic->napi[enic_cq_wq(enic, i)]); 1987 netif_tx_disable(netdev); 1988 1989 if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic)) 1990 enic_dev_del_station_addr(enic); 1991 1992 for (i = 0; i < enic->wq_count; i++) { 1993 err = vnic_wq_disable(&enic->wq[i]); 1994 if (err) 1995 return err; 1996 } 1997 for (i = 0; i < enic->rq_count; i++) { 1998 err = vnic_rq_disable(&enic->rq[i]); 1999 if (err) 2000 return err; 2001 } 2002 2003 enic_dev_notify_unset(enic); 2004 enic_unset_affinity_hint(enic); 2005 enic_free_intr(enic); 2006 2007 for (i = 0; i < enic->wq_count; i++) 2008 vnic_wq_clean(&enic->wq[i], enic_free_wq_buf); 2009 for (i = 0; i < enic->rq_count; i++) 2010 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf); 2011 for (i = 0; i < enic->cq_count; i++) 2012 vnic_cq_clean(&enic->cq[i]); 2013 for (i = 0; i < enic->intr_count; i++) 2014 vnic_intr_clean(&enic->intr[i]); 2015 2016 return 0; 2017 } 2018 2019 static int _enic_change_mtu(struct net_device *netdev, int new_mtu) 2020 { 2021 bool running = netif_running(netdev); 2022 int err = 0; 2023 2024 ASSERT_RTNL(); 2025 if (running) { 2026 err = enic_stop(netdev); 2027 if (err) 2028 return err; 2029 } 2030 2031 netdev->mtu = new_mtu; 2032 2033 if (running) { 2034 err = enic_open(netdev); 2035 if (err) 2036 return err; 2037 } 2038 2039 return 0; 2040 } 2041 2042 static int enic_change_mtu(struct net_device *netdev, int new_mtu) 2043 { 2044 struct enic *enic = netdev_priv(netdev); 2045 2046 if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) 2047 return -EOPNOTSUPP; 2048 2049 if (netdev->mtu > enic->port_mtu) 2050 netdev_warn(netdev, 2051 "interface MTU (%d) set higher than port MTU (%d)\n", 2052 netdev->mtu, enic->port_mtu); 2053 2054 return _enic_change_mtu(netdev, new_mtu); 2055 } 2056 2057 static void enic_change_mtu_work(struct work_struct *work) 2058 { 2059 struct enic *enic = container_of(work, struct enic, change_mtu_work); 2060 struct net_device *netdev = enic->netdev; 2061 int new_mtu = vnic_dev_mtu(enic->vdev); 2062 2063 rtnl_lock(); 2064 (void)_enic_change_mtu(netdev, new_mtu); 2065 rtnl_unlock(); 2066 2067 netdev_info(netdev, "interface MTU set as %d\n", netdev->mtu); 2068 } 2069 2070 #ifdef CONFIG_NET_POLL_CONTROLLER 2071 static void enic_poll_controller(struct net_device *netdev) 2072 { 2073 struct enic *enic = netdev_priv(netdev); 2074 struct vnic_dev *vdev = enic->vdev; 2075 unsigned int i, intr; 2076 2077 switch (vnic_dev_get_intr_mode(vdev)) { 2078 case VNIC_DEV_INTR_MODE_MSIX: 2079 for (i = 0; i < enic->rq_count; i++) { 2080 intr = enic_msix_rq_intr(enic, i); 2081 enic_isr_msix(enic->msix_entry[intr].vector, 2082 &enic->napi[i]); 2083 } 2084 2085 for (i = 0; i < enic->wq_count; i++) { 2086 intr = enic_msix_wq_intr(enic, i); 2087 enic_isr_msix(enic->msix_entry[intr].vector, 2088 &enic->napi[enic_cq_wq(enic, i)]); 2089 } 2090 2091 break; 2092 case VNIC_DEV_INTR_MODE_MSI: 2093 enic_isr_msi(enic->pdev->irq, enic); 2094 break; 2095 case VNIC_DEV_INTR_MODE_INTX: 2096 enic_isr_legacy(enic->pdev->irq, netdev); 2097 break; 2098 default: 2099 break; 2100 } 2101 } 2102 #endif 2103 2104 static int enic_dev_wait(struct vnic_dev *vdev, 2105 int (*start)(struct vnic_dev *, int), 2106 int (*finished)(struct vnic_dev *, int *), 2107 int arg) 2108 { 2109 unsigned long time; 2110 int done; 2111 int err; 2112 2113 err = start(vdev, arg); 2114 if (err) 2115 return err; 2116 2117 /* Wait for func to complete...2 seconds max 2118 */ 2119 2120 time = jiffies + (HZ * 2); 2121 do { 2122 2123 err = finished(vdev, &done); 2124 if (err) 2125 return err; 2126 2127 if (done) 2128 return 0; 2129 2130 schedule_timeout_uninterruptible(HZ / 10); 2131 2132 } while (time_after(time, jiffies)); 2133 2134 return -ETIMEDOUT; 2135 } 2136 2137 static int enic_dev_open(struct enic *enic) 2138 { 2139 int err; 2140 u32 flags = CMD_OPENF_IG_DESCCACHE; 2141 2142 err = enic_dev_wait(enic->vdev, vnic_dev_open, 2143 vnic_dev_open_done, flags); 2144 if (err) 2145 dev_err(enic_get_dev(enic), "vNIC device open failed, err %d\n", 2146 err); 2147 2148 return err; 2149 } 2150 2151 static int enic_dev_soft_reset(struct enic *enic) 2152 { 2153 int err; 2154 2155 err = enic_dev_wait(enic->vdev, vnic_dev_soft_reset, 2156 vnic_dev_soft_reset_done, 0); 2157 if (err) 2158 netdev_err(enic->netdev, "vNIC soft reset failed, err %d\n", 2159 err); 2160 2161 return err; 2162 } 2163 2164 static int enic_dev_hang_reset(struct enic *enic) 2165 { 2166 int err; 2167 2168 err = enic_dev_wait(enic->vdev, vnic_dev_hang_reset, 2169 vnic_dev_hang_reset_done, 0); 2170 if (err) 2171 netdev_err(enic->netdev, "vNIC hang reset failed, err %d\n", 2172 err); 2173 2174 return err; 2175 } 2176 2177 int __enic_set_rsskey(struct enic *enic) 2178 { 2179 union vnic_rss_key *rss_key_buf_va; 2180 dma_addr_t rss_key_buf_pa; 2181 int i, kidx, bidx, err; 2182 2183 rss_key_buf_va = dma_alloc_coherent(&enic->pdev->dev, 2184 sizeof(union vnic_rss_key), 2185 &rss_key_buf_pa, GFP_ATOMIC); 2186 if (!rss_key_buf_va) 2187 return -ENOMEM; 2188 2189 for (i = 0; i < ENIC_RSS_LEN; i++) { 2190 kidx = i / ENIC_RSS_BYTES_PER_KEY; 2191 bidx = i % ENIC_RSS_BYTES_PER_KEY; 2192 rss_key_buf_va->key[kidx].b[bidx] = enic->rss_key[i]; 2193 } 2194 spin_lock_bh(&enic->devcmd_lock); 2195 err = enic_set_rss_key(enic, 2196 rss_key_buf_pa, 2197 sizeof(union vnic_rss_key)); 2198 spin_unlock_bh(&enic->devcmd_lock); 2199 2200 dma_free_coherent(&enic->pdev->dev, sizeof(union vnic_rss_key), 2201 rss_key_buf_va, rss_key_buf_pa); 2202 2203 return err; 2204 } 2205 2206 static int enic_set_rsskey(struct enic *enic) 2207 { 2208 netdev_rss_key_fill(enic->rss_key, ENIC_RSS_LEN); 2209 2210 return __enic_set_rsskey(enic); 2211 } 2212 2213 static int enic_set_rsscpu(struct enic *enic, u8 rss_hash_bits) 2214 { 2215 dma_addr_t rss_cpu_buf_pa; 2216 union vnic_rss_cpu *rss_cpu_buf_va = NULL; 2217 unsigned int i; 2218 int err; 2219 2220 rss_cpu_buf_va = dma_alloc_coherent(&enic->pdev->dev, 2221 sizeof(union vnic_rss_cpu), 2222 &rss_cpu_buf_pa, GFP_ATOMIC); 2223 if (!rss_cpu_buf_va) 2224 return -ENOMEM; 2225 2226 for (i = 0; i < (1 << rss_hash_bits); i++) 2227 (*rss_cpu_buf_va).cpu[i/4].b[i%4] = i % enic->rq_count; 2228 2229 spin_lock_bh(&enic->devcmd_lock); 2230 err = enic_set_rss_cpu(enic, 2231 rss_cpu_buf_pa, 2232 sizeof(union vnic_rss_cpu)); 2233 spin_unlock_bh(&enic->devcmd_lock); 2234 2235 dma_free_coherent(&enic->pdev->dev, sizeof(union vnic_rss_cpu), 2236 rss_cpu_buf_va, rss_cpu_buf_pa); 2237 2238 return err; 2239 } 2240 2241 static int enic_set_niccfg(struct enic *enic, u8 rss_default_cpu, 2242 u8 rss_hash_type, u8 rss_hash_bits, u8 rss_base_cpu, u8 rss_enable) 2243 { 2244 const u8 tso_ipid_split_en = 0; 2245 const u8 ig_vlan_strip_en = 1; 2246 int err; 2247 2248 /* Enable VLAN tag stripping. 2249 */ 2250 2251 spin_lock_bh(&enic->devcmd_lock); 2252 err = enic_set_nic_cfg(enic, 2253 rss_default_cpu, rss_hash_type, 2254 rss_hash_bits, rss_base_cpu, 2255 rss_enable, tso_ipid_split_en, 2256 ig_vlan_strip_en); 2257 spin_unlock_bh(&enic->devcmd_lock); 2258 2259 return err; 2260 } 2261 2262 static int enic_set_rss_nic_cfg(struct enic *enic) 2263 { 2264 struct device *dev = enic_get_dev(enic); 2265 const u8 rss_default_cpu = 0; 2266 const u8 rss_hash_bits = 7; 2267 const u8 rss_base_cpu = 0; 2268 u8 rss_hash_type; 2269 int res; 2270 u8 rss_enable = ENIC_SETTING(enic, RSS) && (enic->rq_count > 1); 2271 2272 spin_lock_bh(&enic->devcmd_lock); 2273 res = vnic_dev_capable_rss_hash_type(enic->vdev, &rss_hash_type); 2274 spin_unlock_bh(&enic->devcmd_lock); 2275 if (res) { 2276 /* defaults for old adapters 2277 */ 2278 rss_hash_type = NIC_CFG_RSS_HASH_TYPE_IPV4 | 2279 NIC_CFG_RSS_HASH_TYPE_TCP_IPV4 | 2280 NIC_CFG_RSS_HASH_TYPE_IPV6 | 2281 NIC_CFG_RSS_HASH_TYPE_TCP_IPV6; 2282 } 2283 2284 if (rss_enable) { 2285 if (!enic_set_rsskey(enic)) { 2286 if (enic_set_rsscpu(enic, rss_hash_bits)) { 2287 rss_enable = 0; 2288 dev_warn(dev, "RSS disabled, " 2289 "Failed to set RSS cpu indirection table."); 2290 } 2291 } else { 2292 rss_enable = 0; 2293 dev_warn(dev, "RSS disabled, Failed to set RSS key.\n"); 2294 } 2295 } 2296 2297 return enic_set_niccfg(enic, rss_default_cpu, rss_hash_type, 2298 rss_hash_bits, rss_base_cpu, rss_enable); 2299 } 2300 2301 static void enic_set_api_busy(struct enic *enic, bool busy) 2302 { 2303 spin_lock(&enic->enic_api_lock); 2304 enic->enic_api_busy = busy; 2305 spin_unlock(&enic->enic_api_lock); 2306 } 2307 2308 static void enic_reset(struct work_struct *work) 2309 { 2310 struct enic *enic = container_of(work, struct enic, reset); 2311 2312 if (!netif_running(enic->netdev)) 2313 return; 2314 2315 rtnl_lock(); 2316 2317 /* Stop any activity from infiniband */ 2318 enic_set_api_busy(enic, true); 2319 2320 enic_stop(enic->netdev); 2321 enic_dev_soft_reset(enic); 2322 enic_reset_addr_lists(enic); 2323 enic_init_vnic_resources(enic); 2324 enic_set_rss_nic_cfg(enic); 2325 enic_dev_set_ig_vlan_rewrite_mode(enic); 2326 enic_open(enic->netdev); 2327 2328 /* Allow infiniband to fiddle with the device again */ 2329 enic_set_api_busy(enic, false); 2330 2331 call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev); 2332 2333 rtnl_unlock(); 2334 } 2335 2336 static void enic_tx_hang_reset(struct work_struct *work) 2337 { 2338 struct enic *enic = container_of(work, struct enic, tx_hang_reset); 2339 2340 rtnl_lock(); 2341 2342 /* Stop any activity from infiniband */ 2343 enic_set_api_busy(enic, true); 2344 2345 enic_dev_hang_notify(enic); 2346 enic_stop(enic->netdev); 2347 enic_dev_hang_reset(enic); 2348 enic_reset_addr_lists(enic); 2349 enic_init_vnic_resources(enic); 2350 enic_set_rss_nic_cfg(enic); 2351 enic_dev_set_ig_vlan_rewrite_mode(enic); 2352 enic_open(enic->netdev); 2353 2354 /* Allow infiniband to fiddle with the device again */ 2355 enic_set_api_busy(enic, false); 2356 2357 call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev); 2358 2359 rtnl_unlock(); 2360 } 2361 2362 static int enic_set_intr_mode(struct enic *enic) 2363 { 2364 unsigned int n = min_t(unsigned int, enic->rq_count, ENIC_RQ_MAX); 2365 unsigned int m = min_t(unsigned int, enic->wq_count, ENIC_WQ_MAX); 2366 unsigned int i; 2367 2368 /* Set interrupt mode (INTx, MSI, MSI-X) depending 2369 * on system capabilities. 2370 * 2371 * Try MSI-X first 2372 * 2373 * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs 2374 * (the second to last INTR is used for WQ/RQ errors) 2375 * (the last INTR is used for notifications) 2376 */ 2377 2378 BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2); 2379 for (i = 0; i < n + m + 2; i++) 2380 enic->msix_entry[i].entry = i; 2381 2382 /* Use multiple RQs if RSS is enabled 2383 */ 2384 2385 if (ENIC_SETTING(enic, RSS) && 2386 enic->config.intr_mode < 1 && 2387 enic->rq_count >= n && 2388 enic->wq_count >= m && 2389 enic->cq_count >= n + m && 2390 enic->intr_count >= n + m + 2) { 2391 2392 if (pci_enable_msix_range(enic->pdev, enic->msix_entry, 2393 n + m + 2, n + m + 2) > 0) { 2394 2395 enic->rq_count = n; 2396 enic->wq_count = m; 2397 enic->cq_count = n + m; 2398 enic->intr_count = n + m + 2; 2399 2400 vnic_dev_set_intr_mode(enic->vdev, 2401 VNIC_DEV_INTR_MODE_MSIX); 2402 2403 return 0; 2404 } 2405 } 2406 2407 if (enic->config.intr_mode < 1 && 2408 enic->rq_count >= 1 && 2409 enic->wq_count >= m && 2410 enic->cq_count >= 1 + m && 2411 enic->intr_count >= 1 + m + 2) { 2412 if (pci_enable_msix_range(enic->pdev, enic->msix_entry, 2413 1 + m + 2, 1 + m + 2) > 0) { 2414 2415 enic->rq_count = 1; 2416 enic->wq_count = m; 2417 enic->cq_count = 1 + m; 2418 enic->intr_count = 1 + m + 2; 2419 2420 vnic_dev_set_intr_mode(enic->vdev, 2421 VNIC_DEV_INTR_MODE_MSIX); 2422 2423 return 0; 2424 } 2425 } 2426 2427 /* Next try MSI 2428 * 2429 * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR 2430 */ 2431 2432 if (enic->config.intr_mode < 2 && 2433 enic->rq_count >= 1 && 2434 enic->wq_count >= 1 && 2435 enic->cq_count >= 2 && 2436 enic->intr_count >= 1 && 2437 !pci_enable_msi(enic->pdev)) { 2438 2439 enic->rq_count = 1; 2440 enic->wq_count = 1; 2441 enic->cq_count = 2; 2442 enic->intr_count = 1; 2443 2444 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI); 2445 2446 return 0; 2447 } 2448 2449 /* Next try INTx 2450 * 2451 * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs 2452 * (the first INTR is used for WQ/RQ) 2453 * (the second INTR is used for WQ/RQ errors) 2454 * (the last INTR is used for notifications) 2455 */ 2456 2457 if (enic->config.intr_mode < 3 && 2458 enic->rq_count >= 1 && 2459 enic->wq_count >= 1 && 2460 enic->cq_count >= 2 && 2461 enic->intr_count >= 3) { 2462 2463 enic->rq_count = 1; 2464 enic->wq_count = 1; 2465 enic->cq_count = 2; 2466 enic->intr_count = 3; 2467 2468 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX); 2469 2470 return 0; 2471 } 2472 2473 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN); 2474 2475 return -EINVAL; 2476 } 2477 2478 static void enic_clear_intr_mode(struct enic *enic) 2479 { 2480 switch (vnic_dev_get_intr_mode(enic->vdev)) { 2481 case VNIC_DEV_INTR_MODE_MSIX: 2482 pci_disable_msix(enic->pdev); 2483 break; 2484 case VNIC_DEV_INTR_MODE_MSI: 2485 pci_disable_msi(enic->pdev); 2486 break; 2487 default: 2488 break; 2489 } 2490 2491 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN); 2492 } 2493 2494 static const struct net_device_ops enic_netdev_dynamic_ops = { 2495 .ndo_open = enic_open, 2496 .ndo_stop = enic_stop, 2497 .ndo_start_xmit = enic_hard_start_xmit, 2498 .ndo_get_stats64 = enic_get_stats, 2499 .ndo_validate_addr = eth_validate_addr, 2500 .ndo_set_rx_mode = enic_set_rx_mode, 2501 .ndo_set_mac_address = enic_set_mac_address_dynamic, 2502 .ndo_change_mtu = enic_change_mtu, 2503 .ndo_vlan_rx_add_vid = enic_vlan_rx_add_vid, 2504 .ndo_vlan_rx_kill_vid = enic_vlan_rx_kill_vid, 2505 .ndo_tx_timeout = enic_tx_timeout, 2506 .ndo_set_vf_port = enic_set_vf_port, 2507 .ndo_get_vf_port = enic_get_vf_port, 2508 .ndo_set_vf_mac = enic_set_vf_mac, 2509 #ifdef CONFIG_NET_POLL_CONTROLLER 2510 .ndo_poll_controller = enic_poll_controller, 2511 #endif 2512 #ifdef CONFIG_RFS_ACCEL 2513 .ndo_rx_flow_steer = enic_rx_flow_steer, 2514 #endif 2515 .ndo_udp_tunnel_add = udp_tunnel_nic_add_port, 2516 .ndo_udp_tunnel_del = udp_tunnel_nic_del_port, 2517 .ndo_features_check = enic_features_check, 2518 }; 2519 2520 static const struct net_device_ops enic_netdev_ops = { 2521 .ndo_open = enic_open, 2522 .ndo_stop = enic_stop, 2523 .ndo_start_xmit = enic_hard_start_xmit, 2524 .ndo_get_stats64 = enic_get_stats, 2525 .ndo_validate_addr = eth_validate_addr, 2526 .ndo_set_mac_address = enic_set_mac_address, 2527 .ndo_set_rx_mode = enic_set_rx_mode, 2528 .ndo_change_mtu = enic_change_mtu, 2529 .ndo_vlan_rx_add_vid = enic_vlan_rx_add_vid, 2530 .ndo_vlan_rx_kill_vid = enic_vlan_rx_kill_vid, 2531 .ndo_tx_timeout = enic_tx_timeout, 2532 .ndo_set_vf_port = enic_set_vf_port, 2533 .ndo_get_vf_port = enic_get_vf_port, 2534 .ndo_set_vf_mac = enic_set_vf_mac, 2535 #ifdef CONFIG_NET_POLL_CONTROLLER 2536 .ndo_poll_controller = enic_poll_controller, 2537 #endif 2538 #ifdef CONFIG_RFS_ACCEL 2539 .ndo_rx_flow_steer = enic_rx_flow_steer, 2540 #endif 2541 .ndo_udp_tunnel_add = udp_tunnel_nic_add_port, 2542 .ndo_udp_tunnel_del = udp_tunnel_nic_del_port, 2543 .ndo_features_check = enic_features_check, 2544 }; 2545 2546 static void enic_dev_deinit(struct enic *enic) 2547 { 2548 unsigned int i; 2549 2550 for (i = 0; i < enic->rq_count; i++) 2551 __netif_napi_del(&enic->napi[i]); 2552 2553 if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) 2554 for (i = 0; i < enic->wq_count; i++) 2555 __netif_napi_del(&enic->napi[enic_cq_wq(enic, i)]); 2556 2557 /* observe RCU grace period after __netif_napi_del() calls */ 2558 synchronize_net(); 2559 2560 enic_free_vnic_resources(enic); 2561 enic_clear_intr_mode(enic); 2562 enic_free_affinity_hint(enic); 2563 } 2564 2565 static void enic_kdump_kernel_config(struct enic *enic) 2566 { 2567 if (is_kdump_kernel()) { 2568 dev_info(enic_get_dev(enic), "Running from within kdump kernel. Using minimal resources\n"); 2569 enic->rq_count = 1; 2570 enic->wq_count = 1; 2571 enic->config.rq_desc_count = ENIC_MIN_RQ_DESCS; 2572 enic->config.wq_desc_count = ENIC_MIN_WQ_DESCS; 2573 enic->config.mtu = min_t(u16, 1500, enic->config.mtu); 2574 } 2575 } 2576 2577 static int enic_dev_init(struct enic *enic) 2578 { 2579 struct device *dev = enic_get_dev(enic); 2580 struct net_device *netdev = enic->netdev; 2581 unsigned int i; 2582 int err; 2583 2584 /* Get interrupt coalesce timer info */ 2585 err = enic_dev_intr_coal_timer_info(enic); 2586 if (err) { 2587 dev_warn(dev, "Using default conversion factor for " 2588 "interrupt coalesce timer\n"); 2589 vnic_dev_intr_coal_timer_info_default(enic->vdev); 2590 } 2591 2592 /* Get vNIC configuration 2593 */ 2594 2595 err = enic_get_vnic_config(enic); 2596 if (err) { 2597 dev_err(dev, "Get vNIC configuration failed, aborting\n"); 2598 return err; 2599 } 2600 2601 /* Get available resource counts 2602 */ 2603 2604 enic_get_res_counts(enic); 2605 2606 /* modify resource count if we are in kdump_kernel 2607 */ 2608 enic_kdump_kernel_config(enic); 2609 2610 /* Set interrupt mode based on resource counts and system 2611 * capabilities 2612 */ 2613 2614 err = enic_set_intr_mode(enic); 2615 if (err) { 2616 dev_err(dev, "Failed to set intr mode based on resource " 2617 "counts and system capabilities, aborting\n"); 2618 return err; 2619 } 2620 2621 /* Allocate and configure vNIC resources 2622 */ 2623 2624 err = enic_alloc_vnic_resources(enic); 2625 if (err) { 2626 dev_err(dev, "Failed to alloc vNIC resources, aborting\n"); 2627 goto err_out_free_vnic_resources; 2628 } 2629 2630 enic_init_vnic_resources(enic); 2631 2632 err = enic_set_rss_nic_cfg(enic); 2633 if (err) { 2634 dev_err(dev, "Failed to config nic, aborting\n"); 2635 goto err_out_free_vnic_resources; 2636 } 2637 2638 switch (vnic_dev_get_intr_mode(enic->vdev)) { 2639 default: 2640 netif_napi_add(netdev, &enic->napi[0], enic_poll, 64); 2641 break; 2642 case VNIC_DEV_INTR_MODE_MSIX: 2643 for (i = 0; i < enic->rq_count; i++) { 2644 netif_napi_add(netdev, &enic->napi[i], 2645 enic_poll_msix_rq, NAPI_POLL_WEIGHT); 2646 } 2647 for (i = 0; i < enic->wq_count; i++) 2648 netif_napi_add(netdev, &enic->napi[enic_cq_wq(enic, i)], 2649 enic_poll_msix_wq, NAPI_POLL_WEIGHT); 2650 break; 2651 } 2652 2653 return 0; 2654 2655 err_out_free_vnic_resources: 2656 enic_free_affinity_hint(enic); 2657 enic_clear_intr_mode(enic); 2658 enic_free_vnic_resources(enic); 2659 2660 return err; 2661 } 2662 2663 static void enic_iounmap(struct enic *enic) 2664 { 2665 unsigned int i; 2666 2667 for (i = 0; i < ARRAY_SIZE(enic->bar); i++) 2668 if (enic->bar[i].vaddr) 2669 iounmap(enic->bar[i].vaddr); 2670 } 2671 2672 static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 2673 { 2674 struct device *dev = &pdev->dev; 2675 struct net_device *netdev; 2676 struct enic *enic; 2677 int using_dac = 0; 2678 unsigned int i; 2679 int err; 2680 #ifdef CONFIG_PCI_IOV 2681 int pos = 0; 2682 #endif 2683 int num_pps = 1; 2684 2685 /* Allocate net device structure and initialize. Private 2686 * instance data is initialized to zero. 2687 */ 2688 2689 netdev = alloc_etherdev_mqs(sizeof(struct enic), 2690 ENIC_RQ_MAX, ENIC_WQ_MAX); 2691 if (!netdev) 2692 return -ENOMEM; 2693 2694 pci_set_drvdata(pdev, netdev); 2695 2696 SET_NETDEV_DEV(netdev, &pdev->dev); 2697 2698 enic = netdev_priv(netdev); 2699 enic->netdev = netdev; 2700 enic->pdev = pdev; 2701 2702 /* Setup PCI resources 2703 */ 2704 2705 err = pci_enable_device_mem(pdev); 2706 if (err) { 2707 dev_err(dev, "Cannot enable PCI device, aborting\n"); 2708 goto err_out_free_netdev; 2709 } 2710 2711 err = pci_request_regions(pdev, DRV_NAME); 2712 if (err) { 2713 dev_err(dev, "Cannot request PCI regions, aborting\n"); 2714 goto err_out_disable_device; 2715 } 2716 2717 pci_set_master(pdev); 2718 2719 /* Query PCI controller on system for DMA addressing 2720 * limitation for the device. Try 47-bit first, and 2721 * fail to 32-bit. 2722 */ 2723 2724 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(47)); 2725 if (err) { 2726 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32)); 2727 if (err) { 2728 dev_err(dev, "No usable DMA configuration, aborting\n"); 2729 goto err_out_release_regions; 2730 } 2731 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); 2732 if (err) { 2733 dev_err(dev, "Unable to obtain %u-bit DMA " 2734 "for consistent allocations, aborting\n", 32); 2735 goto err_out_release_regions; 2736 } 2737 } else { 2738 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(47)); 2739 if (err) { 2740 dev_err(dev, "Unable to obtain %u-bit DMA " 2741 "for consistent allocations, aborting\n", 47); 2742 goto err_out_release_regions; 2743 } 2744 using_dac = 1; 2745 } 2746 2747 /* Map vNIC resources from BAR0-5 2748 */ 2749 2750 for (i = 0; i < ARRAY_SIZE(enic->bar); i++) { 2751 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM)) 2752 continue; 2753 enic->bar[i].len = pci_resource_len(pdev, i); 2754 enic->bar[i].vaddr = pci_iomap(pdev, i, enic->bar[i].len); 2755 if (!enic->bar[i].vaddr) { 2756 dev_err(dev, "Cannot memory-map BAR %d, aborting\n", i); 2757 err = -ENODEV; 2758 goto err_out_iounmap; 2759 } 2760 enic->bar[i].bus_addr = pci_resource_start(pdev, i); 2761 } 2762 2763 /* Register vNIC device 2764 */ 2765 2766 enic->vdev = vnic_dev_register(NULL, enic, pdev, enic->bar, 2767 ARRAY_SIZE(enic->bar)); 2768 if (!enic->vdev) { 2769 dev_err(dev, "vNIC registration failed, aborting\n"); 2770 err = -ENODEV; 2771 goto err_out_iounmap; 2772 } 2773 2774 err = vnic_devcmd_init(enic->vdev); 2775 2776 if (err) 2777 goto err_out_vnic_unregister; 2778 2779 #ifdef CONFIG_PCI_IOV 2780 /* Get number of subvnics */ 2781 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV); 2782 if (pos) { 2783 pci_read_config_word(pdev, pos + PCI_SRIOV_TOTAL_VF, 2784 &enic->num_vfs); 2785 if (enic->num_vfs) { 2786 err = pci_enable_sriov(pdev, enic->num_vfs); 2787 if (err) { 2788 dev_err(dev, "SRIOV enable failed, aborting." 2789 " pci_enable_sriov() returned %d\n", 2790 err); 2791 goto err_out_vnic_unregister; 2792 } 2793 enic->priv_flags |= ENIC_SRIOV_ENABLED; 2794 num_pps = enic->num_vfs; 2795 } 2796 } 2797 #endif 2798 2799 /* Allocate structure for port profiles */ 2800 enic->pp = kcalloc(num_pps, sizeof(*enic->pp), GFP_KERNEL); 2801 if (!enic->pp) { 2802 err = -ENOMEM; 2803 goto err_out_disable_sriov_pp; 2804 } 2805 2806 /* Issue device open to get device in known state 2807 */ 2808 2809 err = enic_dev_open(enic); 2810 if (err) { 2811 dev_err(dev, "vNIC dev open failed, aborting\n"); 2812 goto err_out_disable_sriov; 2813 } 2814 2815 /* Setup devcmd lock 2816 */ 2817 2818 spin_lock_init(&enic->devcmd_lock); 2819 spin_lock_init(&enic->enic_api_lock); 2820 2821 /* 2822 * Set ingress vlan rewrite mode before vnic initialization 2823 */ 2824 2825 err = enic_dev_set_ig_vlan_rewrite_mode(enic); 2826 if (err) { 2827 dev_err(dev, 2828 "Failed to set ingress vlan rewrite mode, aborting.\n"); 2829 goto err_out_dev_close; 2830 } 2831 2832 /* Issue device init to initialize the vnic-to-switch link. 2833 * We'll start with carrier off and wait for link UP 2834 * notification later to turn on carrier. We don't need 2835 * to wait here for the vnic-to-switch link initialization 2836 * to complete; link UP notification is the indication that 2837 * the process is complete. 2838 */ 2839 2840 netif_carrier_off(netdev); 2841 2842 /* Do not call dev_init for a dynamic vnic. 2843 * For a dynamic vnic, init_prov_info will be 2844 * called later by an upper layer. 2845 */ 2846 2847 if (!enic_is_dynamic(enic)) { 2848 err = vnic_dev_init(enic->vdev, 0); 2849 if (err) { 2850 dev_err(dev, "vNIC dev init failed, aborting\n"); 2851 goto err_out_dev_close; 2852 } 2853 } 2854 2855 err = enic_dev_init(enic); 2856 if (err) { 2857 dev_err(dev, "Device initialization failed, aborting\n"); 2858 goto err_out_dev_close; 2859 } 2860 2861 netif_set_real_num_tx_queues(netdev, enic->wq_count); 2862 netif_set_real_num_rx_queues(netdev, enic->rq_count); 2863 2864 /* Setup notification timer, HW reset task, and wq locks 2865 */ 2866 2867 timer_setup(&enic->notify_timer, enic_notify_timer, 0); 2868 2869 enic_rfs_flw_tbl_init(enic); 2870 enic_set_rx_coal_setting(enic); 2871 INIT_WORK(&enic->reset, enic_reset); 2872 INIT_WORK(&enic->tx_hang_reset, enic_tx_hang_reset); 2873 INIT_WORK(&enic->change_mtu_work, enic_change_mtu_work); 2874 2875 for (i = 0; i < enic->wq_count; i++) 2876 spin_lock_init(&enic->wq_lock[i]); 2877 2878 /* Register net device 2879 */ 2880 2881 enic->port_mtu = enic->config.mtu; 2882 2883 err = enic_set_mac_addr(netdev, enic->mac_addr); 2884 if (err) { 2885 dev_err(dev, "Invalid MAC address, aborting\n"); 2886 goto err_out_dev_deinit; 2887 } 2888 2889 enic->tx_coalesce_usecs = enic->config.intr_timer_usec; 2890 /* rx coalesce time already got initialized. This gets used 2891 * if adaptive coal is turned off 2892 */ 2893 enic->rx_coalesce_usecs = enic->tx_coalesce_usecs; 2894 2895 if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) 2896 netdev->netdev_ops = &enic_netdev_dynamic_ops; 2897 else 2898 netdev->netdev_ops = &enic_netdev_ops; 2899 2900 netdev->watchdog_timeo = 2 * HZ; 2901 enic_set_ethtool_ops(netdev); 2902 2903 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX; 2904 if (ENIC_SETTING(enic, LOOP)) { 2905 netdev->features &= ~NETIF_F_HW_VLAN_CTAG_TX; 2906 enic->loop_enable = 1; 2907 enic->loop_tag = enic->config.loop_tag; 2908 dev_info(dev, "loopback tag=0x%04x\n", enic->loop_tag); 2909 } 2910 if (ENIC_SETTING(enic, TXCSUM)) 2911 netdev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM; 2912 if (ENIC_SETTING(enic, TSO)) 2913 netdev->hw_features |= NETIF_F_TSO | 2914 NETIF_F_TSO6 | NETIF_F_TSO_ECN; 2915 if (ENIC_SETTING(enic, RSS)) 2916 netdev->hw_features |= NETIF_F_RXHASH; 2917 if (ENIC_SETTING(enic, RXCSUM)) 2918 netdev->hw_features |= NETIF_F_RXCSUM; 2919 if (ENIC_SETTING(enic, VXLAN)) { 2920 u64 patch_level; 2921 u64 a1 = 0; 2922 2923 netdev->hw_enc_features |= NETIF_F_RXCSUM | 2924 NETIF_F_TSO | 2925 NETIF_F_TSO6 | 2926 NETIF_F_TSO_ECN | 2927 NETIF_F_GSO_UDP_TUNNEL | 2928 NETIF_F_HW_CSUM | 2929 NETIF_F_GSO_UDP_TUNNEL_CSUM; 2930 netdev->hw_features |= netdev->hw_enc_features; 2931 /* get bit mask from hw about supported offload bit level 2932 * BIT(0) = fw supports patch_level 0 2933 * fcoe bit = encap 2934 * fcoe_fc_crc_ok = outer csum ok 2935 * BIT(1) = always set by fw 2936 * BIT(2) = fw supports patch_level 2 2937 * BIT(0) in rss_hash = encap 2938 * BIT(1,2) in rss_hash = outer_ip_csum_ok/ 2939 * outer_tcp_csum_ok 2940 * used in enic_rq_indicate_buf 2941 */ 2942 err = vnic_dev_get_supported_feature_ver(enic->vdev, 2943 VIC_FEATURE_VXLAN, 2944 &patch_level, &a1); 2945 if (err) 2946 patch_level = 0; 2947 enic->vxlan.flags = (u8)a1; 2948 /* mask bits that are supported by driver 2949 */ 2950 patch_level &= BIT_ULL(0) | BIT_ULL(2); 2951 patch_level = fls(patch_level); 2952 patch_level = patch_level ? patch_level - 1 : 0; 2953 enic->vxlan.patch_level = patch_level; 2954 2955 if (vnic_dev_get_res_count(enic->vdev, RES_TYPE_WQ) == 1 || 2956 enic->vxlan.flags & ENIC_VXLAN_MULTI_WQ) { 2957 netdev->udp_tunnel_nic_info = &enic_udp_tunnels_v4; 2958 if (enic->vxlan.flags & ENIC_VXLAN_OUTER_IPV6) 2959 netdev->udp_tunnel_nic_info = &enic_udp_tunnels; 2960 } 2961 } 2962 2963 netdev->features |= netdev->hw_features; 2964 netdev->vlan_features |= netdev->features; 2965 2966 #ifdef CONFIG_RFS_ACCEL 2967 netdev->hw_features |= NETIF_F_NTUPLE; 2968 #endif 2969 2970 if (using_dac) 2971 netdev->features |= NETIF_F_HIGHDMA; 2972 2973 netdev->priv_flags |= IFF_UNICAST_FLT; 2974 2975 /* MTU range: 68 - 9000 */ 2976 netdev->min_mtu = ENIC_MIN_MTU; 2977 netdev->max_mtu = ENIC_MAX_MTU; 2978 netdev->mtu = enic->port_mtu; 2979 2980 err = register_netdev(netdev); 2981 if (err) { 2982 dev_err(dev, "Cannot register net device, aborting\n"); 2983 goto err_out_dev_deinit; 2984 } 2985 enic->rx_copybreak = RX_COPYBREAK_DEFAULT; 2986 2987 return 0; 2988 2989 err_out_dev_deinit: 2990 enic_dev_deinit(enic); 2991 err_out_dev_close: 2992 vnic_dev_close(enic->vdev); 2993 err_out_disable_sriov: 2994 kfree(enic->pp); 2995 err_out_disable_sriov_pp: 2996 #ifdef CONFIG_PCI_IOV 2997 if (enic_sriov_enabled(enic)) { 2998 pci_disable_sriov(pdev); 2999 enic->priv_flags &= ~ENIC_SRIOV_ENABLED; 3000 } 3001 #endif 3002 err_out_vnic_unregister: 3003 vnic_dev_unregister(enic->vdev); 3004 err_out_iounmap: 3005 enic_iounmap(enic); 3006 err_out_release_regions: 3007 pci_release_regions(pdev); 3008 err_out_disable_device: 3009 pci_disable_device(pdev); 3010 err_out_free_netdev: 3011 free_netdev(netdev); 3012 3013 return err; 3014 } 3015 3016 static void enic_remove(struct pci_dev *pdev) 3017 { 3018 struct net_device *netdev = pci_get_drvdata(pdev); 3019 3020 if (netdev) { 3021 struct enic *enic = netdev_priv(netdev); 3022 3023 cancel_work_sync(&enic->reset); 3024 cancel_work_sync(&enic->change_mtu_work); 3025 unregister_netdev(netdev); 3026 enic_dev_deinit(enic); 3027 vnic_dev_close(enic->vdev); 3028 #ifdef CONFIG_PCI_IOV 3029 if (enic_sriov_enabled(enic)) { 3030 pci_disable_sriov(pdev); 3031 enic->priv_flags &= ~ENIC_SRIOV_ENABLED; 3032 } 3033 #endif 3034 kfree(enic->pp); 3035 vnic_dev_unregister(enic->vdev); 3036 enic_iounmap(enic); 3037 pci_release_regions(pdev); 3038 pci_disable_device(pdev); 3039 free_netdev(netdev); 3040 } 3041 } 3042 3043 static struct pci_driver enic_driver = { 3044 .name = DRV_NAME, 3045 .id_table = enic_id_table, 3046 .probe = enic_probe, 3047 .remove = enic_remove, 3048 }; 3049 3050 static int __init enic_init_module(void) 3051 { 3052 return pci_register_driver(&enic_driver); 3053 } 3054 3055 static void __exit enic_cleanup_module(void) 3056 { 3057 pci_unregister_driver(&enic_driver); 3058 } 3059 3060 module_init(enic_init_module); 3061 module_exit(enic_cleanup_module); 3062