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_update_affinity_hint(enic->msix_entry[i].vector, 154 enic->msix[i].affinity_mask); 155 if (err) 156 netdev_warn(enic->netdev, "irq_update_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_update_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_tcp_all_headers(skb); 684 enic_preload_tcp_csum_encap(skb); 685 } else { 686 hdr_len = skb_tcp_all_headers(skb); 687 enic_preload_tcp_csum(skb); 688 } 689 690 /* Queue WQ_ENET_MAX_DESC_LEN length descriptors 691 * for the main skb fragment 692 */ 693 while (frag_len_left) { 694 len = min(frag_len_left, (unsigned int)WQ_ENET_MAX_DESC_LEN); 695 dma_addr = dma_map_single(&enic->pdev->dev, 696 skb->data + offset, len, 697 DMA_TO_DEVICE); 698 if (unlikely(enic_dma_map_check(enic, dma_addr))) 699 return -ENOMEM; 700 enic_queue_wq_desc_tso(wq, skb, dma_addr, len, mss, hdr_len, 701 vlan_tag_insert, vlan_tag, 702 eop && (len == frag_len_left), loopback); 703 frag_len_left -= len; 704 offset += len; 705 } 706 707 if (eop) 708 return 0; 709 710 /* Queue WQ_ENET_MAX_DESC_LEN length descriptors 711 * for additional data fragments 712 */ 713 for (frag = skb_shinfo(skb)->frags; len_left; frag++) { 714 len_left -= skb_frag_size(frag); 715 frag_len_left = skb_frag_size(frag); 716 offset = 0; 717 718 while (frag_len_left) { 719 len = min(frag_len_left, 720 (unsigned int)WQ_ENET_MAX_DESC_LEN); 721 dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag, 722 offset, len, 723 DMA_TO_DEVICE); 724 if (unlikely(enic_dma_map_check(enic, dma_addr))) 725 return -ENOMEM; 726 enic_queue_wq_desc_cont(wq, skb, dma_addr, len, 727 (len_left == 0) && 728 (len == frag_len_left),/*EOP*/ 729 loopback); 730 frag_len_left -= len; 731 offset += len; 732 } 733 } 734 735 return 0; 736 } 737 738 static inline int enic_queue_wq_skb_encap(struct enic *enic, struct vnic_wq *wq, 739 struct sk_buff *skb, 740 int vlan_tag_insert, 741 unsigned int vlan_tag, int loopback) 742 { 743 unsigned int head_len = skb_headlen(skb); 744 unsigned int len_left = skb->len - head_len; 745 /* Hardware will overwrite the checksum fields, calculating from 746 * scratch and ignoring the value placed by software. 747 * Offload mode = 00 748 * mss[2], mss[1], mss[0] bits are set 749 */ 750 unsigned int mss_or_csum = 7; 751 int eop = (len_left == 0); 752 dma_addr_t dma_addr; 753 int err = 0; 754 755 dma_addr = dma_map_single(&enic->pdev->dev, skb->data, head_len, 756 DMA_TO_DEVICE); 757 if (unlikely(enic_dma_map_check(enic, dma_addr))) 758 return -ENOMEM; 759 760 enic_queue_wq_desc_ex(wq, skb, dma_addr, head_len, mss_or_csum, 0, 761 vlan_tag_insert, vlan_tag, 762 WQ_ENET_OFFLOAD_MODE_CSUM, eop, 1 /* SOP */, eop, 763 loopback); 764 if (!eop) 765 err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback); 766 767 return err; 768 } 769 770 static inline int enic_queue_wq_skb(struct enic *enic, 771 struct vnic_wq *wq, struct sk_buff *skb) 772 { 773 unsigned int mss = skb_shinfo(skb)->gso_size; 774 unsigned int vlan_tag = 0; 775 int vlan_tag_insert = 0; 776 int loopback = 0; 777 int err; 778 779 if (skb_vlan_tag_present(skb)) { 780 /* VLAN tag from trunking driver */ 781 vlan_tag_insert = 1; 782 vlan_tag = skb_vlan_tag_get(skb); 783 } else if (enic->loop_enable) { 784 vlan_tag = enic->loop_tag; 785 loopback = 1; 786 } 787 788 if (mss) 789 err = enic_queue_wq_skb_tso(enic, wq, skb, mss, 790 vlan_tag_insert, vlan_tag, 791 loopback); 792 else if (skb->encapsulation) 793 err = enic_queue_wq_skb_encap(enic, wq, skb, vlan_tag_insert, 794 vlan_tag, loopback); 795 else if (skb->ip_summed == CHECKSUM_PARTIAL) 796 err = enic_queue_wq_skb_csum_l4(enic, wq, skb, vlan_tag_insert, 797 vlan_tag, loopback); 798 else 799 err = enic_queue_wq_skb_vlan(enic, wq, skb, vlan_tag_insert, 800 vlan_tag, loopback); 801 if (unlikely(err)) { 802 struct vnic_wq_buf *buf; 803 804 buf = wq->to_use->prev; 805 /* while not EOP of previous pkt && queue not empty. 806 * For all non EOP bufs, os_buf is NULL. 807 */ 808 while (!buf->os_buf && (buf->next != wq->to_clean)) { 809 enic_free_wq_buf(wq, buf); 810 wq->ring.desc_avail++; 811 buf = buf->prev; 812 } 813 wq->to_use = buf->next; 814 dev_kfree_skb(skb); 815 } 816 return err; 817 } 818 819 /* netif_tx_lock held, process context with BHs disabled, or BH */ 820 static netdev_tx_t enic_hard_start_xmit(struct sk_buff *skb, 821 struct net_device *netdev) 822 { 823 struct enic *enic = netdev_priv(netdev); 824 struct vnic_wq *wq; 825 unsigned int txq_map; 826 struct netdev_queue *txq; 827 828 if (skb->len <= 0) { 829 dev_kfree_skb_any(skb); 830 return NETDEV_TX_OK; 831 } 832 833 txq_map = skb_get_queue_mapping(skb) % enic->wq_count; 834 wq = &enic->wq[txq_map]; 835 txq = netdev_get_tx_queue(netdev, txq_map); 836 837 /* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs, 838 * which is very likely. In the off chance it's going to take 839 * more than * ENIC_NON_TSO_MAX_DESC, linearize the skb. 840 */ 841 842 if (skb_shinfo(skb)->gso_size == 0 && 843 skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC && 844 skb_linearize(skb)) { 845 dev_kfree_skb_any(skb); 846 return NETDEV_TX_OK; 847 } 848 849 spin_lock(&enic->wq_lock[txq_map]); 850 851 if (vnic_wq_desc_avail(wq) < 852 skb_shinfo(skb)->nr_frags + ENIC_DESC_MAX_SPLITS) { 853 netif_tx_stop_queue(txq); 854 /* This is a hard error, log it */ 855 netdev_err(netdev, "BUG! Tx ring full when queue awake!\n"); 856 spin_unlock(&enic->wq_lock[txq_map]); 857 return NETDEV_TX_BUSY; 858 } 859 860 if (enic_queue_wq_skb(enic, wq, skb)) 861 goto error; 862 863 if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS) 864 netif_tx_stop_queue(txq); 865 skb_tx_timestamp(skb); 866 if (!netdev_xmit_more() || netif_xmit_stopped(txq)) 867 vnic_wq_doorbell(wq); 868 869 error: 870 spin_unlock(&enic->wq_lock[txq_map]); 871 872 return NETDEV_TX_OK; 873 } 874 875 /* dev_base_lock rwlock held, nominally process context */ 876 static void enic_get_stats(struct net_device *netdev, 877 struct rtnl_link_stats64 *net_stats) 878 { 879 struct enic *enic = netdev_priv(netdev); 880 struct vnic_stats *stats; 881 int err; 882 883 err = enic_dev_stats_dump(enic, &stats); 884 /* return only when dma_alloc_coherent fails in vnic_dev_stats_dump 885 * For other failures, like devcmd failure, we return previously 886 * recorded stats. 887 */ 888 if (err == -ENOMEM) 889 return; 890 891 net_stats->tx_packets = stats->tx.tx_frames_ok; 892 net_stats->tx_bytes = stats->tx.tx_bytes_ok; 893 net_stats->tx_errors = stats->tx.tx_errors; 894 net_stats->tx_dropped = stats->tx.tx_drops; 895 896 net_stats->rx_packets = stats->rx.rx_frames_ok; 897 net_stats->rx_bytes = stats->rx.rx_bytes_ok; 898 net_stats->rx_errors = stats->rx.rx_errors; 899 net_stats->multicast = stats->rx.rx_multicast_frames_ok; 900 net_stats->rx_over_errors = enic->rq_truncated_pkts; 901 net_stats->rx_crc_errors = enic->rq_bad_fcs; 902 net_stats->rx_dropped = stats->rx.rx_no_bufs + stats->rx.rx_drop; 903 } 904 905 static int enic_mc_sync(struct net_device *netdev, const u8 *mc_addr) 906 { 907 struct enic *enic = netdev_priv(netdev); 908 909 if (enic->mc_count == ENIC_MULTICAST_PERFECT_FILTERS) { 910 unsigned int mc_count = netdev_mc_count(netdev); 911 912 netdev_warn(netdev, "Registering only %d out of %d multicast addresses\n", 913 ENIC_MULTICAST_PERFECT_FILTERS, mc_count); 914 915 return -ENOSPC; 916 } 917 918 enic_dev_add_addr(enic, mc_addr); 919 enic->mc_count++; 920 921 return 0; 922 } 923 924 static int enic_mc_unsync(struct net_device *netdev, const u8 *mc_addr) 925 { 926 struct enic *enic = netdev_priv(netdev); 927 928 enic_dev_del_addr(enic, mc_addr); 929 enic->mc_count--; 930 931 return 0; 932 } 933 934 static int enic_uc_sync(struct net_device *netdev, const u8 *uc_addr) 935 { 936 struct enic *enic = netdev_priv(netdev); 937 938 if (enic->uc_count == ENIC_UNICAST_PERFECT_FILTERS) { 939 unsigned int uc_count = netdev_uc_count(netdev); 940 941 netdev_warn(netdev, "Registering only %d out of %d unicast addresses\n", 942 ENIC_UNICAST_PERFECT_FILTERS, uc_count); 943 944 return -ENOSPC; 945 } 946 947 enic_dev_add_addr(enic, uc_addr); 948 enic->uc_count++; 949 950 return 0; 951 } 952 953 static int enic_uc_unsync(struct net_device *netdev, const u8 *uc_addr) 954 { 955 struct enic *enic = netdev_priv(netdev); 956 957 enic_dev_del_addr(enic, uc_addr); 958 enic->uc_count--; 959 960 return 0; 961 } 962 963 void enic_reset_addr_lists(struct enic *enic) 964 { 965 struct net_device *netdev = enic->netdev; 966 967 __dev_uc_unsync(netdev, NULL); 968 __dev_mc_unsync(netdev, NULL); 969 970 enic->mc_count = 0; 971 enic->uc_count = 0; 972 enic->flags = 0; 973 } 974 975 static int enic_set_mac_addr(struct net_device *netdev, char *addr) 976 { 977 struct enic *enic = netdev_priv(netdev); 978 979 if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) { 980 if (!is_valid_ether_addr(addr) && !is_zero_ether_addr(addr)) 981 return -EADDRNOTAVAIL; 982 } else { 983 if (!is_valid_ether_addr(addr)) 984 return -EADDRNOTAVAIL; 985 } 986 987 eth_hw_addr_set(netdev, addr); 988 989 return 0; 990 } 991 992 static int enic_set_mac_address_dynamic(struct net_device *netdev, void *p) 993 { 994 struct enic *enic = netdev_priv(netdev); 995 struct sockaddr *saddr = p; 996 char *addr = saddr->sa_data; 997 int err; 998 999 if (netif_running(enic->netdev)) { 1000 err = enic_dev_del_station_addr(enic); 1001 if (err) 1002 return err; 1003 } 1004 1005 err = enic_set_mac_addr(netdev, addr); 1006 if (err) 1007 return err; 1008 1009 if (netif_running(enic->netdev)) { 1010 err = enic_dev_add_station_addr(enic); 1011 if (err) 1012 return err; 1013 } 1014 1015 return err; 1016 } 1017 1018 static int enic_set_mac_address(struct net_device *netdev, void *p) 1019 { 1020 struct sockaddr *saddr = p; 1021 char *addr = saddr->sa_data; 1022 struct enic *enic = netdev_priv(netdev); 1023 int err; 1024 1025 err = enic_dev_del_station_addr(enic); 1026 if (err) 1027 return err; 1028 1029 err = enic_set_mac_addr(netdev, addr); 1030 if (err) 1031 return err; 1032 1033 return enic_dev_add_station_addr(enic); 1034 } 1035 1036 /* netif_tx_lock held, BHs disabled */ 1037 static void enic_set_rx_mode(struct net_device *netdev) 1038 { 1039 struct enic *enic = netdev_priv(netdev); 1040 int directed = 1; 1041 int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0; 1042 int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0; 1043 int promisc = (netdev->flags & IFF_PROMISC) || 1044 netdev_uc_count(netdev) > ENIC_UNICAST_PERFECT_FILTERS; 1045 int allmulti = (netdev->flags & IFF_ALLMULTI) || 1046 netdev_mc_count(netdev) > ENIC_MULTICAST_PERFECT_FILTERS; 1047 unsigned int flags = netdev->flags | 1048 (allmulti ? IFF_ALLMULTI : 0) | 1049 (promisc ? IFF_PROMISC : 0); 1050 1051 if (enic->flags != flags) { 1052 enic->flags = flags; 1053 enic_dev_packet_filter(enic, directed, 1054 multicast, broadcast, promisc, allmulti); 1055 } 1056 1057 if (!promisc) { 1058 __dev_uc_sync(netdev, enic_uc_sync, enic_uc_unsync); 1059 if (!allmulti) 1060 __dev_mc_sync(netdev, enic_mc_sync, enic_mc_unsync); 1061 } 1062 } 1063 1064 /* netif_tx_lock held, BHs disabled */ 1065 static void enic_tx_timeout(struct net_device *netdev, unsigned int txqueue) 1066 { 1067 struct enic *enic = netdev_priv(netdev); 1068 schedule_work(&enic->tx_hang_reset); 1069 } 1070 1071 static int enic_set_vf_mac(struct net_device *netdev, int vf, u8 *mac) 1072 { 1073 struct enic *enic = netdev_priv(netdev); 1074 struct enic_port_profile *pp; 1075 int err; 1076 1077 ENIC_PP_BY_INDEX(enic, vf, pp, &err); 1078 if (err) 1079 return err; 1080 1081 if (is_valid_ether_addr(mac) || is_zero_ether_addr(mac)) { 1082 if (vf == PORT_SELF_VF) { 1083 memcpy(pp->vf_mac, mac, ETH_ALEN); 1084 return 0; 1085 } else { 1086 /* 1087 * For sriov vf's set the mac in hw 1088 */ 1089 ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic, 1090 vnic_dev_set_mac_addr, mac); 1091 return enic_dev_status_to_errno(err); 1092 } 1093 } else 1094 return -EINVAL; 1095 } 1096 1097 static int enic_set_vf_port(struct net_device *netdev, int vf, 1098 struct nlattr *port[]) 1099 { 1100 static const u8 zero_addr[ETH_ALEN] = {}; 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_hw_addr_set(netdev, zero_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_hw_addr_set(netdev, zero_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, ENIC_LEGACY_NOTIFY_INTR); 1860 break; 1861 case VNIC_DEV_INTR_MODE_MSIX: 1862 err = vnic_dev_notify_set(enic->vdev, 1863 enic_msix_notify_intr(enic)); 1864 break; 1865 default: 1866 err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */); 1867 break; 1868 } 1869 spin_unlock_bh(&enic->devcmd_lock); 1870 1871 return err; 1872 } 1873 1874 static void enic_notify_timer_start(struct enic *enic) 1875 { 1876 switch (vnic_dev_get_intr_mode(enic->vdev)) { 1877 case VNIC_DEV_INTR_MODE_MSI: 1878 mod_timer(&enic->notify_timer, jiffies); 1879 break; 1880 default: 1881 /* Using intr for notification for INTx/MSI-X */ 1882 break; 1883 } 1884 } 1885 1886 /* rtnl lock is held, process context */ 1887 static int enic_open(struct net_device *netdev) 1888 { 1889 struct enic *enic = netdev_priv(netdev); 1890 unsigned int i; 1891 int err, ret; 1892 1893 err = enic_request_intr(enic); 1894 if (err) { 1895 netdev_err(netdev, "Unable to request irq.\n"); 1896 return err; 1897 } 1898 enic_init_affinity_hint(enic); 1899 enic_set_affinity_hint(enic); 1900 1901 err = enic_dev_notify_set(enic); 1902 if (err) { 1903 netdev_err(netdev, 1904 "Failed to alloc notify buffer, aborting.\n"); 1905 goto err_out_free_intr; 1906 } 1907 1908 for (i = 0; i < enic->rq_count; i++) { 1909 /* enable rq before updating rq desc */ 1910 vnic_rq_enable(&enic->rq[i]); 1911 vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf); 1912 /* Need at least one buffer on ring to get going */ 1913 if (vnic_rq_desc_used(&enic->rq[i]) == 0) { 1914 netdev_err(netdev, "Unable to alloc receive buffers\n"); 1915 err = -ENOMEM; 1916 goto err_out_free_rq; 1917 } 1918 } 1919 1920 for (i = 0; i < enic->wq_count; i++) 1921 vnic_wq_enable(&enic->wq[i]); 1922 1923 if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic)) 1924 enic_dev_add_station_addr(enic); 1925 1926 enic_set_rx_mode(netdev); 1927 1928 netif_tx_wake_all_queues(netdev); 1929 1930 for (i = 0; i < enic->rq_count; i++) 1931 napi_enable(&enic->napi[i]); 1932 1933 if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) 1934 for (i = 0; i < enic->wq_count; i++) 1935 napi_enable(&enic->napi[enic_cq_wq(enic, i)]); 1936 enic_dev_enable(enic); 1937 1938 for (i = 0; i < enic->intr_count; i++) 1939 vnic_intr_unmask(&enic->intr[i]); 1940 1941 enic_notify_timer_start(enic); 1942 enic_rfs_timer_start(enic); 1943 1944 return 0; 1945 1946 err_out_free_rq: 1947 for (i = 0; i < enic->rq_count; i++) { 1948 ret = vnic_rq_disable(&enic->rq[i]); 1949 if (!ret) 1950 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf); 1951 } 1952 enic_dev_notify_unset(enic); 1953 err_out_free_intr: 1954 enic_unset_affinity_hint(enic); 1955 enic_free_intr(enic); 1956 1957 return err; 1958 } 1959 1960 /* rtnl lock is held, process context */ 1961 static int enic_stop(struct net_device *netdev) 1962 { 1963 struct enic *enic = netdev_priv(netdev); 1964 unsigned int i; 1965 int err; 1966 1967 for (i = 0; i < enic->intr_count; i++) { 1968 vnic_intr_mask(&enic->intr[i]); 1969 (void)vnic_intr_masked(&enic->intr[i]); /* flush write */ 1970 } 1971 1972 enic_synchronize_irqs(enic); 1973 1974 del_timer_sync(&enic->notify_timer); 1975 enic_rfs_flw_tbl_free(enic); 1976 1977 enic_dev_disable(enic); 1978 1979 for (i = 0; i < enic->rq_count; i++) 1980 napi_disable(&enic->napi[i]); 1981 1982 netif_carrier_off(netdev); 1983 if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) 1984 for (i = 0; i < enic->wq_count; i++) 1985 napi_disable(&enic->napi[enic_cq_wq(enic, i)]); 1986 netif_tx_disable(netdev); 1987 1988 if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic)) 1989 enic_dev_del_station_addr(enic); 1990 1991 for (i = 0; i < enic->wq_count; i++) { 1992 err = vnic_wq_disable(&enic->wq[i]); 1993 if (err) 1994 return err; 1995 } 1996 for (i = 0; i < enic->rq_count; i++) { 1997 err = vnic_rq_disable(&enic->rq[i]); 1998 if (err) 1999 return err; 2000 } 2001 2002 enic_dev_notify_unset(enic); 2003 enic_unset_affinity_hint(enic); 2004 enic_free_intr(enic); 2005 2006 for (i = 0; i < enic->wq_count; i++) 2007 vnic_wq_clean(&enic->wq[i], enic_free_wq_buf); 2008 for (i = 0; i < enic->rq_count; i++) 2009 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf); 2010 for (i = 0; i < enic->cq_count; i++) 2011 vnic_cq_clean(&enic->cq[i]); 2012 for (i = 0; i < enic->intr_count; i++) 2013 vnic_intr_clean(&enic->intr[i]); 2014 2015 return 0; 2016 } 2017 2018 static int _enic_change_mtu(struct net_device *netdev, int new_mtu) 2019 { 2020 bool running = netif_running(netdev); 2021 int err = 0; 2022 2023 ASSERT_RTNL(); 2024 if (running) { 2025 err = enic_stop(netdev); 2026 if (err) 2027 return err; 2028 } 2029 2030 netdev->mtu = new_mtu; 2031 2032 if (running) { 2033 err = enic_open(netdev); 2034 if (err) 2035 return err; 2036 } 2037 2038 return 0; 2039 } 2040 2041 static int enic_change_mtu(struct net_device *netdev, int new_mtu) 2042 { 2043 struct enic *enic = netdev_priv(netdev); 2044 2045 if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) 2046 return -EOPNOTSUPP; 2047 2048 if (netdev->mtu > enic->port_mtu) 2049 netdev_warn(netdev, 2050 "interface MTU (%d) set higher than port MTU (%d)\n", 2051 netdev->mtu, enic->port_mtu); 2052 2053 return _enic_change_mtu(netdev, new_mtu); 2054 } 2055 2056 static void enic_change_mtu_work(struct work_struct *work) 2057 { 2058 struct enic *enic = container_of(work, struct enic, change_mtu_work); 2059 struct net_device *netdev = enic->netdev; 2060 int new_mtu = vnic_dev_mtu(enic->vdev); 2061 2062 rtnl_lock(); 2063 (void)_enic_change_mtu(netdev, new_mtu); 2064 rtnl_unlock(); 2065 2066 netdev_info(netdev, "interface MTU set as %d\n", netdev->mtu); 2067 } 2068 2069 #ifdef CONFIG_NET_POLL_CONTROLLER 2070 static void enic_poll_controller(struct net_device *netdev) 2071 { 2072 struct enic *enic = netdev_priv(netdev); 2073 struct vnic_dev *vdev = enic->vdev; 2074 unsigned int i, intr; 2075 2076 switch (vnic_dev_get_intr_mode(vdev)) { 2077 case VNIC_DEV_INTR_MODE_MSIX: 2078 for (i = 0; i < enic->rq_count; i++) { 2079 intr = enic_msix_rq_intr(enic, i); 2080 enic_isr_msix(enic->msix_entry[intr].vector, 2081 &enic->napi[i]); 2082 } 2083 2084 for (i = 0; i < enic->wq_count; i++) { 2085 intr = enic_msix_wq_intr(enic, i); 2086 enic_isr_msix(enic->msix_entry[intr].vector, 2087 &enic->napi[enic_cq_wq(enic, i)]); 2088 } 2089 2090 break; 2091 case VNIC_DEV_INTR_MODE_MSI: 2092 enic_isr_msi(enic->pdev->irq, enic); 2093 break; 2094 case VNIC_DEV_INTR_MODE_INTX: 2095 enic_isr_legacy(enic->pdev->irq, netdev); 2096 break; 2097 default: 2098 break; 2099 } 2100 } 2101 #endif 2102 2103 static int enic_dev_wait(struct vnic_dev *vdev, 2104 int (*start)(struct vnic_dev *, int), 2105 int (*finished)(struct vnic_dev *, int *), 2106 int arg) 2107 { 2108 unsigned long time; 2109 int done; 2110 int err; 2111 2112 err = start(vdev, arg); 2113 if (err) 2114 return err; 2115 2116 /* Wait for func to complete...2 seconds max 2117 */ 2118 2119 time = jiffies + (HZ * 2); 2120 do { 2121 2122 err = finished(vdev, &done); 2123 if (err) 2124 return err; 2125 2126 if (done) 2127 return 0; 2128 2129 schedule_timeout_uninterruptible(HZ / 10); 2130 2131 } while (time_after(time, jiffies)); 2132 2133 return -ETIMEDOUT; 2134 } 2135 2136 static int enic_dev_open(struct enic *enic) 2137 { 2138 int err; 2139 u32 flags = CMD_OPENF_IG_DESCCACHE; 2140 2141 err = enic_dev_wait(enic->vdev, vnic_dev_open, 2142 vnic_dev_open_done, flags); 2143 if (err) 2144 dev_err(enic_get_dev(enic), "vNIC device open failed, err %d\n", 2145 err); 2146 2147 return err; 2148 } 2149 2150 static int enic_dev_soft_reset(struct enic *enic) 2151 { 2152 int err; 2153 2154 err = enic_dev_wait(enic->vdev, vnic_dev_soft_reset, 2155 vnic_dev_soft_reset_done, 0); 2156 if (err) 2157 netdev_err(enic->netdev, "vNIC soft reset failed, err %d\n", 2158 err); 2159 2160 return err; 2161 } 2162 2163 static int enic_dev_hang_reset(struct enic *enic) 2164 { 2165 int err; 2166 2167 err = enic_dev_wait(enic->vdev, vnic_dev_hang_reset, 2168 vnic_dev_hang_reset_done, 0); 2169 if (err) 2170 netdev_err(enic->netdev, "vNIC hang reset failed, err %d\n", 2171 err); 2172 2173 return err; 2174 } 2175 2176 int __enic_set_rsskey(struct enic *enic) 2177 { 2178 union vnic_rss_key *rss_key_buf_va; 2179 dma_addr_t rss_key_buf_pa; 2180 int i, kidx, bidx, err; 2181 2182 rss_key_buf_va = dma_alloc_coherent(&enic->pdev->dev, 2183 sizeof(union vnic_rss_key), 2184 &rss_key_buf_pa, GFP_ATOMIC); 2185 if (!rss_key_buf_va) 2186 return -ENOMEM; 2187 2188 for (i = 0; i < ENIC_RSS_LEN; i++) { 2189 kidx = i / ENIC_RSS_BYTES_PER_KEY; 2190 bidx = i % ENIC_RSS_BYTES_PER_KEY; 2191 rss_key_buf_va->key[kidx].b[bidx] = enic->rss_key[i]; 2192 } 2193 spin_lock_bh(&enic->devcmd_lock); 2194 err = enic_set_rss_key(enic, 2195 rss_key_buf_pa, 2196 sizeof(union vnic_rss_key)); 2197 spin_unlock_bh(&enic->devcmd_lock); 2198 2199 dma_free_coherent(&enic->pdev->dev, sizeof(union vnic_rss_key), 2200 rss_key_buf_va, rss_key_buf_pa); 2201 2202 return err; 2203 } 2204 2205 static int enic_set_rsskey(struct enic *enic) 2206 { 2207 netdev_rss_key_fill(enic->rss_key, ENIC_RSS_LEN); 2208 2209 return __enic_set_rsskey(enic); 2210 } 2211 2212 static int enic_set_rsscpu(struct enic *enic, u8 rss_hash_bits) 2213 { 2214 dma_addr_t rss_cpu_buf_pa; 2215 union vnic_rss_cpu *rss_cpu_buf_va = NULL; 2216 unsigned int i; 2217 int err; 2218 2219 rss_cpu_buf_va = dma_alloc_coherent(&enic->pdev->dev, 2220 sizeof(union vnic_rss_cpu), 2221 &rss_cpu_buf_pa, GFP_ATOMIC); 2222 if (!rss_cpu_buf_va) 2223 return -ENOMEM; 2224 2225 for (i = 0; i < (1 << rss_hash_bits); i++) 2226 (*rss_cpu_buf_va).cpu[i/4].b[i%4] = i % enic->rq_count; 2227 2228 spin_lock_bh(&enic->devcmd_lock); 2229 err = enic_set_rss_cpu(enic, 2230 rss_cpu_buf_pa, 2231 sizeof(union vnic_rss_cpu)); 2232 spin_unlock_bh(&enic->devcmd_lock); 2233 2234 dma_free_coherent(&enic->pdev->dev, sizeof(union vnic_rss_cpu), 2235 rss_cpu_buf_va, rss_cpu_buf_pa); 2236 2237 return err; 2238 } 2239 2240 static int enic_set_niccfg(struct enic *enic, u8 rss_default_cpu, 2241 u8 rss_hash_type, u8 rss_hash_bits, u8 rss_base_cpu, u8 rss_enable) 2242 { 2243 const u8 tso_ipid_split_en = 0; 2244 const u8 ig_vlan_strip_en = 1; 2245 int err; 2246 2247 /* Enable VLAN tag stripping. 2248 */ 2249 2250 spin_lock_bh(&enic->devcmd_lock); 2251 err = enic_set_nic_cfg(enic, 2252 rss_default_cpu, rss_hash_type, 2253 rss_hash_bits, rss_base_cpu, 2254 rss_enable, tso_ipid_split_en, 2255 ig_vlan_strip_en); 2256 spin_unlock_bh(&enic->devcmd_lock); 2257 2258 return err; 2259 } 2260 2261 static int enic_set_rss_nic_cfg(struct enic *enic) 2262 { 2263 struct device *dev = enic_get_dev(enic); 2264 const u8 rss_default_cpu = 0; 2265 const u8 rss_hash_bits = 7; 2266 const u8 rss_base_cpu = 0; 2267 u8 rss_hash_type; 2268 int res; 2269 u8 rss_enable = ENIC_SETTING(enic, RSS) && (enic->rq_count > 1); 2270 2271 spin_lock_bh(&enic->devcmd_lock); 2272 res = vnic_dev_capable_rss_hash_type(enic->vdev, &rss_hash_type); 2273 spin_unlock_bh(&enic->devcmd_lock); 2274 if (res) { 2275 /* defaults for old adapters 2276 */ 2277 rss_hash_type = NIC_CFG_RSS_HASH_TYPE_IPV4 | 2278 NIC_CFG_RSS_HASH_TYPE_TCP_IPV4 | 2279 NIC_CFG_RSS_HASH_TYPE_IPV6 | 2280 NIC_CFG_RSS_HASH_TYPE_TCP_IPV6; 2281 } 2282 2283 if (rss_enable) { 2284 if (!enic_set_rsskey(enic)) { 2285 if (enic_set_rsscpu(enic, rss_hash_bits)) { 2286 rss_enable = 0; 2287 dev_warn(dev, "RSS disabled, " 2288 "Failed to set RSS cpu indirection table."); 2289 } 2290 } else { 2291 rss_enable = 0; 2292 dev_warn(dev, "RSS disabled, Failed to set RSS key.\n"); 2293 } 2294 } 2295 2296 return enic_set_niccfg(enic, rss_default_cpu, rss_hash_type, 2297 rss_hash_bits, rss_base_cpu, rss_enable); 2298 } 2299 2300 static void enic_set_api_busy(struct enic *enic, bool busy) 2301 { 2302 spin_lock(&enic->enic_api_lock); 2303 enic->enic_api_busy = busy; 2304 spin_unlock(&enic->enic_api_lock); 2305 } 2306 2307 static void enic_reset(struct work_struct *work) 2308 { 2309 struct enic *enic = container_of(work, struct enic, reset); 2310 2311 if (!netif_running(enic->netdev)) 2312 return; 2313 2314 rtnl_lock(); 2315 2316 /* Stop any activity from infiniband */ 2317 enic_set_api_busy(enic, true); 2318 2319 enic_stop(enic->netdev); 2320 enic_dev_soft_reset(enic); 2321 enic_reset_addr_lists(enic); 2322 enic_init_vnic_resources(enic); 2323 enic_set_rss_nic_cfg(enic); 2324 enic_dev_set_ig_vlan_rewrite_mode(enic); 2325 enic_open(enic->netdev); 2326 2327 /* Allow infiniband to fiddle with the device again */ 2328 enic_set_api_busy(enic, false); 2329 2330 call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev); 2331 2332 rtnl_unlock(); 2333 } 2334 2335 static void enic_tx_hang_reset(struct work_struct *work) 2336 { 2337 struct enic *enic = container_of(work, struct enic, tx_hang_reset); 2338 2339 rtnl_lock(); 2340 2341 /* Stop any activity from infiniband */ 2342 enic_set_api_busy(enic, true); 2343 2344 enic_dev_hang_notify(enic); 2345 enic_stop(enic->netdev); 2346 enic_dev_hang_reset(enic); 2347 enic_reset_addr_lists(enic); 2348 enic_init_vnic_resources(enic); 2349 enic_set_rss_nic_cfg(enic); 2350 enic_dev_set_ig_vlan_rewrite_mode(enic); 2351 enic_open(enic->netdev); 2352 2353 /* Allow infiniband to fiddle with the device again */ 2354 enic_set_api_busy(enic, false); 2355 2356 call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev); 2357 2358 rtnl_unlock(); 2359 } 2360 2361 static int enic_set_intr_mode(struct enic *enic) 2362 { 2363 unsigned int n = min_t(unsigned int, enic->rq_count, ENIC_RQ_MAX); 2364 unsigned int m = min_t(unsigned int, enic->wq_count, ENIC_WQ_MAX); 2365 unsigned int i; 2366 2367 /* Set interrupt mode (INTx, MSI, MSI-X) depending 2368 * on system capabilities. 2369 * 2370 * Try MSI-X first 2371 * 2372 * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs 2373 * (the second to last INTR is used for WQ/RQ errors) 2374 * (the last INTR is used for notifications) 2375 */ 2376 2377 BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2); 2378 for (i = 0; i < n + m + 2; i++) 2379 enic->msix_entry[i].entry = i; 2380 2381 /* Use multiple RQs if RSS is enabled 2382 */ 2383 2384 if (ENIC_SETTING(enic, RSS) && 2385 enic->config.intr_mode < 1 && 2386 enic->rq_count >= n && 2387 enic->wq_count >= m && 2388 enic->cq_count >= n + m && 2389 enic->intr_count >= n + m + 2) { 2390 2391 if (pci_enable_msix_range(enic->pdev, enic->msix_entry, 2392 n + m + 2, n + m + 2) > 0) { 2393 2394 enic->rq_count = n; 2395 enic->wq_count = m; 2396 enic->cq_count = n + m; 2397 enic->intr_count = n + m + 2; 2398 2399 vnic_dev_set_intr_mode(enic->vdev, 2400 VNIC_DEV_INTR_MODE_MSIX); 2401 2402 return 0; 2403 } 2404 } 2405 2406 if (enic->config.intr_mode < 1 && 2407 enic->rq_count >= 1 && 2408 enic->wq_count >= m && 2409 enic->cq_count >= 1 + m && 2410 enic->intr_count >= 1 + m + 2) { 2411 if (pci_enable_msix_range(enic->pdev, enic->msix_entry, 2412 1 + m + 2, 1 + m + 2) > 0) { 2413 2414 enic->rq_count = 1; 2415 enic->wq_count = m; 2416 enic->cq_count = 1 + m; 2417 enic->intr_count = 1 + m + 2; 2418 2419 vnic_dev_set_intr_mode(enic->vdev, 2420 VNIC_DEV_INTR_MODE_MSIX); 2421 2422 return 0; 2423 } 2424 } 2425 2426 /* Next try MSI 2427 * 2428 * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR 2429 */ 2430 2431 if (enic->config.intr_mode < 2 && 2432 enic->rq_count >= 1 && 2433 enic->wq_count >= 1 && 2434 enic->cq_count >= 2 && 2435 enic->intr_count >= 1 && 2436 !pci_enable_msi(enic->pdev)) { 2437 2438 enic->rq_count = 1; 2439 enic->wq_count = 1; 2440 enic->cq_count = 2; 2441 enic->intr_count = 1; 2442 2443 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI); 2444 2445 return 0; 2446 } 2447 2448 /* Next try INTx 2449 * 2450 * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs 2451 * (the first INTR is used for WQ/RQ) 2452 * (the second INTR is used for WQ/RQ errors) 2453 * (the last INTR is used for notifications) 2454 */ 2455 2456 if (enic->config.intr_mode < 3 && 2457 enic->rq_count >= 1 && 2458 enic->wq_count >= 1 && 2459 enic->cq_count >= 2 && 2460 enic->intr_count >= 3) { 2461 2462 enic->rq_count = 1; 2463 enic->wq_count = 1; 2464 enic->cq_count = 2; 2465 enic->intr_count = 3; 2466 2467 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX); 2468 2469 return 0; 2470 } 2471 2472 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN); 2473 2474 return -EINVAL; 2475 } 2476 2477 static void enic_clear_intr_mode(struct enic *enic) 2478 { 2479 switch (vnic_dev_get_intr_mode(enic->vdev)) { 2480 case VNIC_DEV_INTR_MODE_MSIX: 2481 pci_disable_msix(enic->pdev); 2482 break; 2483 case VNIC_DEV_INTR_MODE_MSI: 2484 pci_disable_msi(enic->pdev); 2485 break; 2486 default: 2487 break; 2488 } 2489 2490 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN); 2491 } 2492 2493 static const struct net_device_ops enic_netdev_dynamic_ops = { 2494 .ndo_open = enic_open, 2495 .ndo_stop = enic_stop, 2496 .ndo_start_xmit = enic_hard_start_xmit, 2497 .ndo_get_stats64 = enic_get_stats, 2498 .ndo_validate_addr = eth_validate_addr, 2499 .ndo_set_rx_mode = enic_set_rx_mode, 2500 .ndo_set_mac_address = enic_set_mac_address_dynamic, 2501 .ndo_change_mtu = enic_change_mtu, 2502 .ndo_vlan_rx_add_vid = enic_vlan_rx_add_vid, 2503 .ndo_vlan_rx_kill_vid = enic_vlan_rx_kill_vid, 2504 .ndo_tx_timeout = enic_tx_timeout, 2505 .ndo_set_vf_port = enic_set_vf_port, 2506 .ndo_get_vf_port = enic_get_vf_port, 2507 .ndo_set_vf_mac = enic_set_vf_mac, 2508 #ifdef CONFIG_NET_POLL_CONTROLLER 2509 .ndo_poll_controller = enic_poll_controller, 2510 #endif 2511 #ifdef CONFIG_RFS_ACCEL 2512 .ndo_rx_flow_steer = enic_rx_flow_steer, 2513 #endif 2514 .ndo_features_check = enic_features_check, 2515 }; 2516 2517 static const struct net_device_ops enic_netdev_ops = { 2518 .ndo_open = enic_open, 2519 .ndo_stop = enic_stop, 2520 .ndo_start_xmit = enic_hard_start_xmit, 2521 .ndo_get_stats64 = enic_get_stats, 2522 .ndo_validate_addr = eth_validate_addr, 2523 .ndo_set_mac_address = enic_set_mac_address, 2524 .ndo_set_rx_mode = enic_set_rx_mode, 2525 .ndo_change_mtu = enic_change_mtu, 2526 .ndo_vlan_rx_add_vid = enic_vlan_rx_add_vid, 2527 .ndo_vlan_rx_kill_vid = enic_vlan_rx_kill_vid, 2528 .ndo_tx_timeout = enic_tx_timeout, 2529 .ndo_set_vf_port = enic_set_vf_port, 2530 .ndo_get_vf_port = enic_get_vf_port, 2531 .ndo_set_vf_mac = enic_set_vf_mac, 2532 #ifdef CONFIG_NET_POLL_CONTROLLER 2533 .ndo_poll_controller = enic_poll_controller, 2534 #endif 2535 #ifdef CONFIG_RFS_ACCEL 2536 .ndo_rx_flow_steer = enic_rx_flow_steer, 2537 #endif 2538 .ndo_features_check = enic_features_check, 2539 }; 2540 2541 static void enic_dev_deinit(struct enic *enic) 2542 { 2543 unsigned int i; 2544 2545 for (i = 0; i < enic->rq_count; i++) 2546 __netif_napi_del(&enic->napi[i]); 2547 2548 if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) 2549 for (i = 0; i < enic->wq_count; i++) 2550 __netif_napi_del(&enic->napi[enic_cq_wq(enic, i)]); 2551 2552 /* observe RCU grace period after __netif_napi_del() calls */ 2553 synchronize_net(); 2554 2555 enic_free_vnic_resources(enic); 2556 enic_clear_intr_mode(enic); 2557 enic_free_affinity_hint(enic); 2558 } 2559 2560 static void enic_kdump_kernel_config(struct enic *enic) 2561 { 2562 if (is_kdump_kernel()) { 2563 dev_info(enic_get_dev(enic), "Running from within kdump kernel. Using minimal resources\n"); 2564 enic->rq_count = 1; 2565 enic->wq_count = 1; 2566 enic->config.rq_desc_count = ENIC_MIN_RQ_DESCS; 2567 enic->config.wq_desc_count = ENIC_MIN_WQ_DESCS; 2568 enic->config.mtu = min_t(u16, 1500, enic->config.mtu); 2569 } 2570 } 2571 2572 static int enic_dev_init(struct enic *enic) 2573 { 2574 struct device *dev = enic_get_dev(enic); 2575 struct net_device *netdev = enic->netdev; 2576 unsigned int i; 2577 int err; 2578 2579 /* Get interrupt coalesce timer info */ 2580 err = enic_dev_intr_coal_timer_info(enic); 2581 if (err) { 2582 dev_warn(dev, "Using default conversion factor for " 2583 "interrupt coalesce timer\n"); 2584 vnic_dev_intr_coal_timer_info_default(enic->vdev); 2585 } 2586 2587 /* Get vNIC configuration 2588 */ 2589 2590 err = enic_get_vnic_config(enic); 2591 if (err) { 2592 dev_err(dev, "Get vNIC configuration failed, aborting\n"); 2593 return err; 2594 } 2595 2596 /* Get available resource counts 2597 */ 2598 2599 enic_get_res_counts(enic); 2600 2601 /* modify resource count if we are in kdump_kernel 2602 */ 2603 enic_kdump_kernel_config(enic); 2604 2605 /* Set interrupt mode based on resource counts and system 2606 * capabilities 2607 */ 2608 2609 err = enic_set_intr_mode(enic); 2610 if (err) { 2611 dev_err(dev, "Failed to set intr mode based on resource " 2612 "counts and system capabilities, aborting\n"); 2613 return err; 2614 } 2615 2616 /* Allocate and configure vNIC resources 2617 */ 2618 2619 err = enic_alloc_vnic_resources(enic); 2620 if (err) { 2621 dev_err(dev, "Failed to alloc vNIC resources, aborting\n"); 2622 goto err_out_free_vnic_resources; 2623 } 2624 2625 enic_init_vnic_resources(enic); 2626 2627 err = enic_set_rss_nic_cfg(enic); 2628 if (err) { 2629 dev_err(dev, "Failed to config nic, aborting\n"); 2630 goto err_out_free_vnic_resources; 2631 } 2632 2633 switch (vnic_dev_get_intr_mode(enic->vdev)) { 2634 default: 2635 netif_napi_add(netdev, &enic->napi[0], enic_poll); 2636 break; 2637 case VNIC_DEV_INTR_MODE_MSIX: 2638 for (i = 0; i < enic->rq_count; i++) { 2639 netif_napi_add(netdev, &enic->napi[i], 2640 enic_poll_msix_rq); 2641 } 2642 for (i = 0; i < enic->wq_count; i++) 2643 netif_napi_add(netdev, 2644 &enic->napi[enic_cq_wq(enic, i)], 2645 enic_poll_msix_wq); 2646 break; 2647 } 2648 2649 return 0; 2650 2651 err_out_free_vnic_resources: 2652 enic_free_affinity_hint(enic); 2653 enic_clear_intr_mode(enic); 2654 enic_free_vnic_resources(enic); 2655 2656 return err; 2657 } 2658 2659 static void enic_iounmap(struct enic *enic) 2660 { 2661 unsigned int i; 2662 2663 for (i = 0; i < ARRAY_SIZE(enic->bar); i++) 2664 if (enic->bar[i].vaddr) 2665 iounmap(enic->bar[i].vaddr); 2666 } 2667 2668 static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 2669 { 2670 struct device *dev = &pdev->dev; 2671 struct net_device *netdev; 2672 struct enic *enic; 2673 int using_dac = 0; 2674 unsigned int i; 2675 int err; 2676 #ifdef CONFIG_PCI_IOV 2677 int pos = 0; 2678 #endif 2679 int num_pps = 1; 2680 2681 /* Allocate net device structure and initialize. Private 2682 * instance data is initialized to zero. 2683 */ 2684 2685 netdev = alloc_etherdev_mqs(sizeof(struct enic), 2686 ENIC_RQ_MAX, ENIC_WQ_MAX); 2687 if (!netdev) 2688 return -ENOMEM; 2689 2690 pci_set_drvdata(pdev, netdev); 2691 2692 SET_NETDEV_DEV(netdev, &pdev->dev); 2693 2694 enic = netdev_priv(netdev); 2695 enic->netdev = netdev; 2696 enic->pdev = pdev; 2697 2698 /* Setup PCI resources 2699 */ 2700 2701 err = pci_enable_device_mem(pdev); 2702 if (err) { 2703 dev_err(dev, "Cannot enable PCI device, aborting\n"); 2704 goto err_out_free_netdev; 2705 } 2706 2707 err = pci_request_regions(pdev, DRV_NAME); 2708 if (err) { 2709 dev_err(dev, "Cannot request PCI regions, aborting\n"); 2710 goto err_out_disable_device; 2711 } 2712 2713 pci_set_master(pdev); 2714 2715 /* Query PCI controller on system for DMA addressing 2716 * limitation for the device. Try 47-bit first, and 2717 * fail to 32-bit. 2718 */ 2719 2720 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(47)); 2721 if (err) { 2722 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 2723 if (err) { 2724 dev_err(dev, "No usable DMA configuration, aborting\n"); 2725 goto err_out_release_regions; 2726 } 2727 } else { 2728 using_dac = 1; 2729 } 2730 2731 /* Map vNIC resources from BAR0-5 2732 */ 2733 2734 for (i = 0; i < ARRAY_SIZE(enic->bar); i++) { 2735 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM)) 2736 continue; 2737 enic->bar[i].len = pci_resource_len(pdev, i); 2738 enic->bar[i].vaddr = pci_iomap(pdev, i, enic->bar[i].len); 2739 if (!enic->bar[i].vaddr) { 2740 dev_err(dev, "Cannot memory-map BAR %d, aborting\n", i); 2741 err = -ENODEV; 2742 goto err_out_iounmap; 2743 } 2744 enic->bar[i].bus_addr = pci_resource_start(pdev, i); 2745 } 2746 2747 /* Register vNIC device 2748 */ 2749 2750 enic->vdev = vnic_dev_register(NULL, enic, pdev, enic->bar, 2751 ARRAY_SIZE(enic->bar)); 2752 if (!enic->vdev) { 2753 dev_err(dev, "vNIC registration failed, aborting\n"); 2754 err = -ENODEV; 2755 goto err_out_iounmap; 2756 } 2757 2758 err = vnic_devcmd_init(enic->vdev); 2759 2760 if (err) 2761 goto err_out_vnic_unregister; 2762 2763 #ifdef CONFIG_PCI_IOV 2764 /* Get number of subvnics */ 2765 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV); 2766 if (pos) { 2767 pci_read_config_word(pdev, pos + PCI_SRIOV_TOTAL_VF, 2768 &enic->num_vfs); 2769 if (enic->num_vfs) { 2770 err = pci_enable_sriov(pdev, enic->num_vfs); 2771 if (err) { 2772 dev_err(dev, "SRIOV enable failed, aborting." 2773 " pci_enable_sriov() returned %d\n", 2774 err); 2775 goto err_out_vnic_unregister; 2776 } 2777 enic->priv_flags |= ENIC_SRIOV_ENABLED; 2778 num_pps = enic->num_vfs; 2779 } 2780 } 2781 #endif 2782 2783 /* Allocate structure for port profiles */ 2784 enic->pp = kcalloc(num_pps, sizeof(*enic->pp), GFP_KERNEL); 2785 if (!enic->pp) { 2786 err = -ENOMEM; 2787 goto err_out_disable_sriov_pp; 2788 } 2789 2790 /* Issue device open to get device in known state 2791 */ 2792 2793 err = enic_dev_open(enic); 2794 if (err) { 2795 dev_err(dev, "vNIC dev open failed, aborting\n"); 2796 goto err_out_disable_sriov; 2797 } 2798 2799 /* Setup devcmd lock 2800 */ 2801 2802 spin_lock_init(&enic->devcmd_lock); 2803 spin_lock_init(&enic->enic_api_lock); 2804 2805 /* 2806 * Set ingress vlan rewrite mode before vnic initialization 2807 */ 2808 2809 err = enic_dev_set_ig_vlan_rewrite_mode(enic); 2810 if (err) { 2811 dev_err(dev, 2812 "Failed to set ingress vlan rewrite mode, aborting.\n"); 2813 goto err_out_dev_close; 2814 } 2815 2816 /* Issue device init to initialize the vnic-to-switch link. 2817 * We'll start with carrier off and wait for link UP 2818 * notification later to turn on carrier. We don't need 2819 * to wait here for the vnic-to-switch link initialization 2820 * to complete; link UP notification is the indication that 2821 * the process is complete. 2822 */ 2823 2824 netif_carrier_off(netdev); 2825 2826 /* Do not call dev_init for a dynamic vnic. 2827 * For a dynamic vnic, init_prov_info will be 2828 * called later by an upper layer. 2829 */ 2830 2831 if (!enic_is_dynamic(enic)) { 2832 err = vnic_dev_init(enic->vdev, 0); 2833 if (err) { 2834 dev_err(dev, "vNIC dev init failed, aborting\n"); 2835 goto err_out_dev_close; 2836 } 2837 } 2838 2839 err = enic_dev_init(enic); 2840 if (err) { 2841 dev_err(dev, "Device initialization failed, aborting\n"); 2842 goto err_out_dev_close; 2843 } 2844 2845 netif_set_real_num_tx_queues(netdev, enic->wq_count); 2846 netif_set_real_num_rx_queues(netdev, enic->rq_count); 2847 2848 /* Setup notification timer, HW reset task, and wq locks 2849 */ 2850 2851 timer_setup(&enic->notify_timer, enic_notify_timer, 0); 2852 2853 enic_rfs_flw_tbl_init(enic); 2854 enic_set_rx_coal_setting(enic); 2855 INIT_WORK(&enic->reset, enic_reset); 2856 INIT_WORK(&enic->tx_hang_reset, enic_tx_hang_reset); 2857 INIT_WORK(&enic->change_mtu_work, enic_change_mtu_work); 2858 2859 for (i = 0; i < enic->wq_count; i++) 2860 spin_lock_init(&enic->wq_lock[i]); 2861 2862 /* Register net device 2863 */ 2864 2865 enic->port_mtu = enic->config.mtu; 2866 2867 err = enic_set_mac_addr(netdev, enic->mac_addr); 2868 if (err) { 2869 dev_err(dev, "Invalid MAC address, aborting\n"); 2870 goto err_out_dev_deinit; 2871 } 2872 2873 enic->tx_coalesce_usecs = enic->config.intr_timer_usec; 2874 /* rx coalesce time already got initialized. This gets used 2875 * if adaptive coal is turned off 2876 */ 2877 enic->rx_coalesce_usecs = enic->tx_coalesce_usecs; 2878 2879 if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) 2880 netdev->netdev_ops = &enic_netdev_dynamic_ops; 2881 else 2882 netdev->netdev_ops = &enic_netdev_ops; 2883 2884 netdev->watchdog_timeo = 2 * HZ; 2885 enic_set_ethtool_ops(netdev); 2886 2887 netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX; 2888 if (ENIC_SETTING(enic, LOOP)) { 2889 netdev->features &= ~NETIF_F_HW_VLAN_CTAG_TX; 2890 enic->loop_enable = 1; 2891 enic->loop_tag = enic->config.loop_tag; 2892 dev_info(dev, "loopback tag=0x%04x\n", enic->loop_tag); 2893 } 2894 if (ENIC_SETTING(enic, TXCSUM)) 2895 netdev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM; 2896 if (ENIC_SETTING(enic, TSO)) 2897 netdev->hw_features |= NETIF_F_TSO | 2898 NETIF_F_TSO6 | NETIF_F_TSO_ECN; 2899 if (ENIC_SETTING(enic, RSS)) 2900 netdev->hw_features |= NETIF_F_RXHASH; 2901 if (ENIC_SETTING(enic, RXCSUM)) 2902 netdev->hw_features |= NETIF_F_RXCSUM; 2903 if (ENIC_SETTING(enic, VXLAN)) { 2904 u64 patch_level; 2905 u64 a1 = 0; 2906 2907 netdev->hw_enc_features |= NETIF_F_RXCSUM | 2908 NETIF_F_TSO | 2909 NETIF_F_TSO6 | 2910 NETIF_F_TSO_ECN | 2911 NETIF_F_GSO_UDP_TUNNEL | 2912 NETIF_F_HW_CSUM | 2913 NETIF_F_GSO_UDP_TUNNEL_CSUM; 2914 netdev->hw_features |= netdev->hw_enc_features; 2915 /* get bit mask from hw about supported offload bit level 2916 * BIT(0) = fw supports patch_level 0 2917 * fcoe bit = encap 2918 * fcoe_fc_crc_ok = outer csum ok 2919 * BIT(1) = always set by fw 2920 * BIT(2) = fw supports patch_level 2 2921 * BIT(0) in rss_hash = encap 2922 * BIT(1,2) in rss_hash = outer_ip_csum_ok/ 2923 * outer_tcp_csum_ok 2924 * used in enic_rq_indicate_buf 2925 */ 2926 err = vnic_dev_get_supported_feature_ver(enic->vdev, 2927 VIC_FEATURE_VXLAN, 2928 &patch_level, &a1); 2929 if (err) 2930 patch_level = 0; 2931 enic->vxlan.flags = (u8)a1; 2932 /* mask bits that are supported by driver 2933 */ 2934 patch_level &= BIT_ULL(0) | BIT_ULL(2); 2935 patch_level = fls(patch_level); 2936 patch_level = patch_level ? patch_level - 1 : 0; 2937 enic->vxlan.patch_level = patch_level; 2938 2939 if (vnic_dev_get_res_count(enic->vdev, RES_TYPE_WQ) == 1 || 2940 enic->vxlan.flags & ENIC_VXLAN_MULTI_WQ) { 2941 netdev->udp_tunnel_nic_info = &enic_udp_tunnels_v4; 2942 if (enic->vxlan.flags & ENIC_VXLAN_OUTER_IPV6) 2943 netdev->udp_tunnel_nic_info = &enic_udp_tunnels; 2944 } 2945 } 2946 2947 netdev->features |= netdev->hw_features; 2948 netdev->vlan_features |= netdev->features; 2949 2950 #ifdef CONFIG_RFS_ACCEL 2951 netdev->hw_features |= NETIF_F_NTUPLE; 2952 #endif 2953 2954 if (using_dac) 2955 netdev->features |= NETIF_F_HIGHDMA; 2956 2957 netdev->priv_flags |= IFF_UNICAST_FLT; 2958 2959 /* MTU range: 68 - 9000 */ 2960 netdev->min_mtu = ENIC_MIN_MTU; 2961 netdev->max_mtu = ENIC_MAX_MTU; 2962 netdev->mtu = enic->port_mtu; 2963 2964 err = register_netdev(netdev); 2965 if (err) { 2966 dev_err(dev, "Cannot register net device, aborting\n"); 2967 goto err_out_dev_deinit; 2968 } 2969 enic->rx_copybreak = RX_COPYBREAK_DEFAULT; 2970 2971 return 0; 2972 2973 err_out_dev_deinit: 2974 enic_dev_deinit(enic); 2975 err_out_dev_close: 2976 vnic_dev_close(enic->vdev); 2977 err_out_disable_sriov: 2978 kfree(enic->pp); 2979 err_out_disable_sriov_pp: 2980 #ifdef CONFIG_PCI_IOV 2981 if (enic_sriov_enabled(enic)) { 2982 pci_disable_sriov(pdev); 2983 enic->priv_flags &= ~ENIC_SRIOV_ENABLED; 2984 } 2985 #endif 2986 err_out_vnic_unregister: 2987 vnic_dev_unregister(enic->vdev); 2988 err_out_iounmap: 2989 enic_iounmap(enic); 2990 err_out_release_regions: 2991 pci_release_regions(pdev); 2992 err_out_disable_device: 2993 pci_disable_device(pdev); 2994 err_out_free_netdev: 2995 free_netdev(netdev); 2996 2997 return err; 2998 } 2999 3000 static void enic_remove(struct pci_dev *pdev) 3001 { 3002 struct net_device *netdev = pci_get_drvdata(pdev); 3003 3004 if (netdev) { 3005 struct enic *enic = netdev_priv(netdev); 3006 3007 cancel_work_sync(&enic->reset); 3008 cancel_work_sync(&enic->change_mtu_work); 3009 unregister_netdev(netdev); 3010 enic_dev_deinit(enic); 3011 vnic_dev_close(enic->vdev); 3012 #ifdef CONFIG_PCI_IOV 3013 if (enic_sriov_enabled(enic)) { 3014 pci_disable_sriov(pdev); 3015 enic->priv_flags &= ~ENIC_SRIOV_ENABLED; 3016 } 3017 #endif 3018 kfree(enic->pp); 3019 vnic_dev_unregister(enic->vdev); 3020 enic_iounmap(enic); 3021 pci_release_regions(pdev); 3022 pci_disable_device(pdev); 3023 free_netdev(netdev); 3024 } 3025 } 3026 3027 static struct pci_driver enic_driver = { 3028 .name = DRV_NAME, 3029 .id_table = enic_id_table, 3030 .probe = enic_probe, 3031 .remove = enic_remove, 3032 }; 3033 3034 module_pci_driver(enic_driver); 3035