1906 lines · c
1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause2/*3 * Copyright(c) 2015-2020 Intel Corporation.4 * Copyright(c) 2021 Cornelis Networks.5 */6 7#include <linux/spinlock.h>8#include <linux/pci.h>9#include <linux/io.h>10#include <linux/delay.h>11#include <linux/netdevice.h>12#include <linux/vmalloc.h>13#include <linux/module.h>14#include <linux/prefetch.h>15#include <rdma/ib_verbs.h>16#include <linux/etherdevice.h>17 18#include "hfi.h"19#include "trace.h"20#include "qp.h"21#include "sdma.h"22#include "debugfs.h"23#include "vnic.h"24#include "fault.h"25 26#include "ipoib.h"27#include "netdev.h"28 29#undef pr_fmt30#define pr_fmt(fmt) DRIVER_NAME ": " fmt31 32DEFINE_MUTEX(hfi1_mutex); /* general driver use */33 34unsigned int hfi1_max_mtu = HFI1_DEFAULT_MAX_MTU;35module_param_named(max_mtu, hfi1_max_mtu, uint, S_IRUGO);36MODULE_PARM_DESC(max_mtu, "Set max MTU bytes, default is " __stringify(37 HFI1_DEFAULT_MAX_MTU));38 39unsigned int hfi1_cu = 1;40module_param_named(cu, hfi1_cu, uint, S_IRUGO);41MODULE_PARM_DESC(cu, "Credit return units");42 43unsigned long hfi1_cap_mask = HFI1_CAP_MASK_DEFAULT;44static int hfi1_caps_set(const char *val, const struct kernel_param *kp);45static int hfi1_caps_get(char *buffer, const struct kernel_param *kp);46static const struct kernel_param_ops cap_ops = {47 .set = hfi1_caps_set,48 .get = hfi1_caps_get49};50module_param_cb(cap_mask, &cap_ops, &hfi1_cap_mask, S_IWUSR | S_IRUGO);51MODULE_PARM_DESC(cap_mask, "Bit mask of enabled/disabled HW features");52 53MODULE_LICENSE("Dual BSD/GPL");54MODULE_DESCRIPTION("Cornelis Omni-Path Express driver");55 56/*57 * MAX_PKT_RCV is the max # if packets processed per receive interrupt.58 */59#define MAX_PKT_RECV 6460/*61 * MAX_PKT_THREAD_RCV is the max # of packets processed before62 * the qp_wait_list queue is flushed.63 */64#define MAX_PKT_RECV_THREAD (MAX_PKT_RECV * 4)65#define EGR_HEAD_UPDATE_THRESHOLD 1666 67struct hfi1_ib_stats hfi1_stats;68 69static int hfi1_caps_set(const char *val, const struct kernel_param *kp)70{71 int ret = 0;72 unsigned long *cap_mask_ptr = (unsigned long *)kp->arg,73 cap_mask = *cap_mask_ptr, value, diff,74 write_mask = ((HFI1_CAP_WRITABLE_MASK << HFI1_CAP_USER_SHIFT) |75 HFI1_CAP_WRITABLE_MASK);76 77 ret = kstrtoul(val, 0, &value);78 if (ret) {79 pr_warn("Invalid module parameter value for 'cap_mask'\n");80 goto done;81 }82 /* Get the changed bits (except the locked bit) */83 diff = value ^ (cap_mask & ~HFI1_CAP_LOCKED_SMASK);84 85 /* Remove any bits that are not allowed to change after driver load */86 if (HFI1_CAP_LOCKED() && (diff & ~write_mask)) {87 pr_warn("Ignoring non-writable capability bits %#lx\n",88 diff & ~write_mask);89 diff &= write_mask;90 }91 92 /* Mask off any reserved bits */93 diff &= ~HFI1_CAP_RESERVED_MASK;94 /* Clear any previously set and changing bits */95 cap_mask &= ~diff;96 /* Update the bits with the new capability */97 cap_mask |= (value & diff);98 /* Check for any kernel/user restrictions */99 diff = (cap_mask & (HFI1_CAP_MUST_HAVE_KERN << HFI1_CAP_USER_SHIFT)) ^100 ((cap_mask & HFI1_CAP_MUST_HAVE_KERN) << HFI1_CAP_USER_SHIFT);101 cap_mask &= ~diff;102 /* Set the bitmask to the final set */103 *cap_mask_ptr = cap_mask;104done:105 return ret;106}107 108static int hfi1_caps_get(char *buffer, const struct kernel_param *kp)109{110 unsigned long cap_mask = *(unsigned long *)kp->arg;111 112 cap_mask &= ~HFI1_CAP_LOCKED_SMASK;113 cap_mask |= ((cap_mask & HFI1_CAP_K2U) << HFI1_CAP_USER_SHIFT);114 115 return sysfs_emit(buffer, "0x%lx\n", cap_mask);116}117 118struct pci_dev *get_pci_dev(struct rvt_dev_info *rdi)119{120 struct hfi1_ibdev *ibdev = container_of(rdi, struct hfi1_ibdev, rdi);121 struct hfi1_devdata *dd = container_of(ibdev,122 struct hfi1_devdata, verbs_dev);123 return dd->pcidev;124}125 126/*127 * Return count of units with at least one port ACTIVE.128 */129int hfi1_count_active_units(void)130{131 struct hfi1_devdata *dd;132 struct hfi1_pportdata *ppd;133 unsigned long index, flags;134 int pidx, nunits_active = 0;135 136 xa_lock_irqsave(&hfi1_dev_table, flags);137 xa_for_each(&hfi1_dev_table, index, dd) {138 if (!(dd->flags & HFI1_PRESENT) || !dd->kregbase1)139 continue;140 for (pidx = 0; pidx < dd->num_pports; ++pidx) {141 ppd = dd->pport + pidx;142 if (ppd->lid && ppd->linkup) {143 nunits_active++;144 break;145 }146 }147 }148 xa_unlock_irqrestore(&hfi1_dev_table, flags);149 return nunits_active;150}151 152/*153 * Get address of eager buffer from it's index (allocated in chunks, not154 * contiguous).155 */156static inline void *get_egrbuf(const struct hfi1_ctxtdata *rcd, u64 rhf,157 u8 *update)158{159 u32 idx = rhf_egr_index(rhf), offset = rhf_egr_buf_offset(rhf);160 161 *update |= !(idx & (rcd->egrbufs.threshold - 1)) && !offset;162 return (void *)(((u64)(rcd->egrbufs.rcvtids[idx].addr)) +163 (offset * RCV_BUF_BLOCK_SIZE));164}165 166static inline void *hfi1_get_header(struct hfi1_ctxtdata *rcd,167 __le32 *rhf_addr)168{169 u32 offset = rhf_hdrq_offset(rhf_to_cpu(rhf_addr));170 171 return (void *)(rhf_addr - rcd->rhf_offset + offset);172}173 174static inline struct ib_header *hfi1_get_msgheader(struct hfi1_ctxtdata *rcd,175 __le32 *rhf_addr)176{177 return (struct ib_header *)hfi1_get_header(rcd, rhf_addr);178}179 180static inline struct hfi1_16b_header181 *hfi1_get_16B_header(struct hfi1_ctxtdata *rcd,182 __le32 *rhf_addr)183{184 return (struct hfi1_16b_header *)hfi1_get_header(rcd, rhf_addr);185}186 187/*188 * Validate and encode the a given RcvArray Buffer size.189 * The function will check whether the given size falls within190 * allowed size ranges for the respective type and, optionally,191 * return the proper encoding.192 */193int hfi1_rcvbuf_validate(u32 size, u8 type, u16 *encoded)194{195 if (unlikely(!PAGE_ALIGNED(size)))196 return 0;197 if (unlikely(size < MIN_EAGER_BUFFER))198 return 0;199 if (size >200 (type == PT_EAGER ? MAX_EAGER_BUFFER : MAX_EXPECTED_BUFFER))201 return 0;202 if (encoded)203 *encoded = ilog2(size / PAGE_SIZE) + 1;204 return 1;205}206 207static void rcv_hdrerr(struct hfi1_ctxtdata *rcd, struct hfi1_pportdata *ppd,208 struct hfi1_packet *packet)209{210 struct ib_header *rhdr = packet->hdr;211 u32 rte = rhf_rcv_type_err(packet->rhf);212 u32 mlid_base;213 struct hfi1_ibport *ibp = rcd_to_iport(rcd);214 struct hfi1_devdata *dd = ppd->dd;215 struct hfi1_ibdev *verbs_dev = &dd->verbs_dev;216 struct rvt_dev_info *rdi = &verbs_dev->rdi;217 218 if ((packet->rhf & RHF_DC_ERR) &&219 hfi1_dbg_fault_suppress_err(verbs_dev))220 return;221 222 if (packet->rhf & RHF_ICRC_ERR)223 return;224 225 if (packet->etype == RHF_RCV_TYPE_BYPASS) {226 goto drop;227 } else {228 u8 lnh = ib_get_lnh(rhdr);229 230 mlid_base = be16_to_cpu(IB_MULTICAST_LID_BASE);231 if (lnh == HFI1_LRH_BTH) {232 packet->ohdr = &rhdr->u.oth;233 } else if (lnh == HFI1_LRH_GRH) {234 packet->ohdr = &rhdr->u.l.oth;235 packet->grh = &rhdr->u.l.grh;236 } else {237 goto drop;238 }239 }240 241 if (packet->rhf & RHF_TID_ERR) {242 /* For TIDERR and RC QPs preemptively schedule a NAK */243 u32 tlen = rhf_pkt_len(packet->rhf); /* in bytes */244 u32 dlid = ib_get_dlid(rhdr);245 u32 qp_num;246 247 /* Sanity check packet */248 if (tlen < 24)249 goto drop;250 251 /* Check for GRH */252 if (packet->grh) {253 u32 vtf;254 struct ib_grh *grh = packet->grh;255 256 if (grh->next_hdr != IB_GRH_NEXT_HDR)257 goto drop;258 vtf = be32_to_cpu(grh->version_tclass_flow);259 if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)260 goto drop;261 }262 263 /* Get the destination QP number. */264 qp_num = ib_bth_get_qpn(packet->ohdr);265 if (dlid < mlid_base) {266 struct rvt_qp *qp;267 unsigned long flags;268 269 rcu_read_lock();270 qp = rvt_lookup_qpn(rdi, &ibp->rvp, qp_num);271 if (!qp) {272 rcu_read_unlock();273 goto drop;274 }275 276 /*277 * Handle only RC QPs - for other QP types drop error278 * packet.279 */280 spin_lock_irqsave(&qp->r_lock, flags);281 282 /* Check for valid receive state. */283 if (!(ib_rvt_state_ops[qp->state] &284 RVT_PROCESS_RECV_OK)) {285 ibp->rvp.n_pkt_drops++;286 }287 288 switch (qp->ibqp.qp_type) {289 case IB_QPT_RC:290 hfi1_rc_hdrerr(rcd, packet, qp);291 break;292 default:293 /* For now don't handle any other QP types */294 break;295 }296 297 spin_unlock_irqrestore(&qp->r_lock, flags);298 rcu_read_unlock();299 } /* Unicast QP */300 } /* Valid packet with TIDErr */301 302 /* handle "RcvTypeErr" flags */303 switch (rte) {304 case RHF_RTE_ERROR_OP_CODE_ERR:305 {306 void *ebuf = NULL;307 u8 opcode;308 309 if (rhf_use_egr_bfr(packet->rhf))310 ebuf = packet->ebuf;311 312 if (!ebuf)313 goto drop; /* this should never happen */314 315 opcode = ib_bth_get_opcode(packet->ohdr);316 if (opcode == IB_OPCODE_CNP) {317 /*318 * Only in pre-B0 h/w is the CNP_OPCODE handled319 * via this code path.320 */321 struct rvt_qp *qp = NULL;322 u32 lqpn, rqpn;323 u16 rlid;324 u8 svc_type, sl, sc5;325 326 sc5 = hfi1_9B_get_sc5(rhdr, packet->rhf);327 sl = ibp->sc_to_sl[sc5];328 329 lqpn = ib_bth_get_qpn(packet->ohdr);330 rcu_read_lock();331 qp = rvt_lookup_qpn(rdi, &ibp->rvp, lqpn);332 if (!qp) {333 rcu_read_unlock();334 goto drop;335 }336 337 switch (qp->ibqp.qp_type) {338 case IB_QPT_UD:339 rlid = 0;340 rqpn = 0;341 svc_type = IB_CC_SVCTYPE_UD;342 break;343 case IB_QPT_UC:344 rlid = ib_get_slid(rhdr);345 rqpn = qp->remote_qpn;346 svc_type = IB_CC_SVCTYPE_UC;347 break;348 default:349 rcu_read_unlock();350 goto drop;351 }352 353 process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);354 rcu_read_unlock();355 }356 357 packet->rhf &= ~RHF_RCV_TYPE_ERR_SMASK;358 break;359 }360 default:361 break;362 }363 364drop:365 return;366}367 368static inline void init_packet(struct hfi1_ctxtdata *rcd,369 struct hfi1_packet *packet)370{371 packet->rsize = get_hdrqentsize(rcd); /* words */372 packet->maxcnt = get_hdrq_cnt(rcd) * packet->rsize; /* words */373 packet->rcd = rcd;374 packet->updegr = 0;375 packet->etail = -1;376 packet->rhf_addr = get_rhf_addr(rcd);377 packet->rhf = rhf_to_cpu(packet->rhf_addr);378 packet->rhqoff = hfi1_rcd_head(rcd);379 packet->numpkt = 0;380}381 382/* We support only two types - 9B and 16B for now */383static const hfi1_handle_cnp hfi1_handle_cnp_tbl[2] = {384 [HFI1_PKT_TYPE_9B] = &return_cnp,385 [HFI1_PKT_TYPE_16B] = &return_cnp_16B386};387 388/**389 * hfi1_process_ecn_slowpath - Process FECN or BECN bits390 * @qp: The packet's destination QP391 * @pkt: The packet itself.392 * @prescan: Is the caller the RXQ prescan393 *394 * Process the packet's FECN or BECN bits. By now, the packet395 * has already been evaluated whether processing of those bit should396 * be done.397 * The significance of the @prescan argument is that if the caller398 * is the RXQ prescan, a CNP will be send out instead of waiting for the399 * normal packet processing to send an ACK with BECN set (or a CNP).400 */401bool hfi1_process_ecn_slowpath(struct rvt_qp *qp, struct hfi1_packet *pkt,402 bool prescan)403{404 struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);405 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);406 struct ib_other_headers *ohdr = pkt->ohdr;407 struct ib_grh *grh = pkt->grh;408 u32 rqpn = 0;409 u16 pkey;410 u32 rlid, slid, dlid = 0;411 u8 hdr_type, sc, svc_type, opcode;412 bool is_mcast = false, ignore_fecn = false, do_cnp = false,413 fecn, becn;414 415 /* can be called from prescan */416 if (pkt->etype == RHF_RCV_TYPE_BYPASS) {417 pkey = hfi1_16B_get_pkey(pkt->hdr);418 sc = hfi1_16B_get_sc(pkt->hdr);419 dlid = hfi1_16B_get_dlid(pkt->hdr);420 slid = hfi1_16B_get_slid(pkt->hdr);421 is_mcast = hfi1_is_16B_mcast(dlid);422 opcode = ib_bth_get_opcode(ohdr);423 hdr_type = HFI1_PKT_TYPE_16B;424 fecn = hfi1_16B_get_fecn(pkt->hdr);425 becn = hfi1_16B_get_becn(pkt->hdr);426 } else {427 pkey = ib_bth_get_pkey(ohdr);428 sc = hfi1_9B_get_sc5(pkt->hdr, pkt->rhf);429 dlid = qp->ibqp.qp_type != IB_QPT_UD ? ib_get_dlid(pkt->hdr) :430 ppd->lid;431 slid = ib_get_slid(pkt->hdr);432 is_mcast = (dlid > be16_to_cpu(IB_MULTICAST_LID_BASE)) &&433 (dlid != be16_to_cpu(IB_LID_PERMISSIVE));434 opcode = ib_bth_get_opcode(ohdr);435 hdr_type = HFI1_PKT_TYPE_9B;436 fecn = ib_bth_get_fecn(ohdr);437 becn = ib_bth_get_becn(ohdr);438 }439 440 switch (qp->ibqp.qp_type) {441 case IB_QPT_UD:442 rlid = slid;443 rqpn = ib_get_sqpn(pkt->ohdr);444 svc_type = IB_CC_SVCTYPE_UD;445 break;446 case IB_QPT_SMI:447 case IB_QPT_GSI:448 rlid = slid;449 rqpn = ib_get_sqpn(pkt->ohdr);450 svc_type = IB_CC_SVCTYPE_UD;451 break;452 case IB_QPT_UC:453 rlid = rdma_ah_get_dlid(&qp->remote_ah_attr);454 rqpn = qp->remote_qpn;455 svc_type = IB_CC_SVCTYPE_UC;456 break;457 case IB_QPT_RC:458 rlid = rdma_ah_get_dlid(&qp->remote_ah_attr);459 rqpn = qp->remote_qpn;460 svc_type = IB_CC_SVCTYPE_RC;461 break;462 default:463 return false;464 }465 466 ignore_fecn = is_mcast || (opcode == IB_OPCODE_CNP) ||467 (opcode == IB_OPCODE_RC_ACKNOWLEDGE);468 /*469 * ACKNOWLEDGE packets do not get a CNP but this will be470 * guarded by ignore_fecn above.471 */472 do_cnp = prescan ||473 (opcode >= IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST &&474 opcode <= IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE) ||475 opcode == TID_OP(READ_RESP) ||476 opcode == TID_OP(ACK);477 478 /* Call appropriate CNP handler */479 if (!ignore_fecn && do_cnp && fecn)480 hfi1_handle_cnp_tbl[hdr_type](ibp, qp, rqpn, pkey,481 dlid, rlid, sc, grh);482 483 if (becn) {484 u32 lqpn = be32_to_cpu(ohdr->bth[1]) & RVT_QPN_MASK;485 u8 sl = ibp->sc_to_sl[sc];486 487 process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);488 }489 return !ignore_fecn && fecn;490}491 492struct ps_mdata {493 struct hfi1_ctxtdata *rcd;494 u32 rsize;495 u32 maxcnt;496 u32 ps_head;497 u32 ps_tail;498 u32 ps_seq;499};500 501static inline void init_ps_mdata(struct ps_mdata *mdata,502 struct hfi1_packet *packet)503{504 struct hfi1_ctxtdata *rcd = packet->rcd;505 506 mdata->rcd = rcd;507 mdata->rsize = packet->rsize;508 mdata->maxcnt = packet->maxcnt;509 mdata->ps_head = packet->rhqoff;510 511 if (get_dma_rtail_setting(rcd)) {512 mdata->ps_tail = get_rcvhdrtail(rcd);513 if (rcd->ctxt == HFI1_CTRL_CTXT)514 mdata->ps_seq = hfi1_seq_cnt(rcd);515 else516 mdata->ps_seq = 0; /* not used with DMA_RTAIL */517 } else {518 mdata->ps_tail = 0; /* used only with DMA_RTAIL*/519 mdata->ps_seq = hfi1_seq_cnt(rcd);520 }521}522 523static inline int ps_done(struct ps_mdata *mdata, u64 rhf,524 struct hfi1_ctxtdata *rcd)525{526 if (get_dma_rtail_setting(rcd))527 return mdata->ps_head == mdata->ps_tail;528 return mdata->ps_seq != rhf_rcv_seq(rhf);529}530 531static inline int ps_skip(struct ps_mdata *mdata, u64 rhf,532 struct hfi1_ctxtdata *rcd)533{534 /*535 * Control context can potentially receive an invalid rhf.536 * Drop such packets.537 */538 if ((rcd->ctxt == HFI1_CTRL_CTXT) && (mdata->ps_head != mdata->ps_tail))539 return mdata->ps_seq != rhf_rcv_seq(rhf);540 541 return 0;542}543 544static inline void update_ps_mdata(struct ps_mdata *mdata,545 struct hfi1_ctxtdata *rcd)546{547 mdata->ps_head += mdata->rsize;548 if (mdata->ps_head >= mdata->maxcnt)549 mdata->ps_head = 0;550 551 /* Control context must do seq counting */552 if (!get_dma_rtail_setting(rcd) ||553 rcd->ctxt == HFI1_CTRL_CTXT)554 mdata->ps_seq = hfi1_seq_incr_wrap(mdata->ps_seq);555}556 557/*558 * prescan_rxq - search through the receive queue looking for packets559 * containing Excplicit Congestion Notifications (FECNs, or BECNs).560 * When an ECN is found, process the Congestion Notification, and toggle561 * it off.562 * This is declared as a macro to allow quick checking of the port to avoid563 * the overhead of a function call if not enabled.564 */565#define prescan_rxq(rcd, packet) \566 do { \567 if (rcd->ppd->cc_prescan) \568 __prescan_rxq(packet); \569 } while (0)570static void __prescan_rxq(struct hfi1_packet *packet)571{572 struct hfi1_ctxtdata *rcd = packet->rcd;573 struct ps_mdata mdata;574 575 init_ps_mdata(&mdata, packet);576 577 while (1) {578 struct hfi1_ibport *ibp = rcd_to_iport(rcd);579 __le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head +580 packet->rcd->rhf_offset;581 struct rvt_qp *qp;582 struct ib_header *hdr;583 struct rvt_dev_info *rdi = &rcd->dd->verbs_dev.rdi;584 u64 rhf = rhf_to_cpu(rhf_addr);585 u32 etype = rhf_rcv_type(rhf), qpn, bth1;586 u8 lnh;587 588 if (ps_done(&mdata, rhf, rcd))589 break;590 591 if (ps_skip(&mdata, rhf, rcd))592 goto next;593 594 if (etype != RHF_RCV_TYPE_IB)595 goto next;596 597 packet->hdr = hfi1_get_msgheader(packet->rcd, rhf_addr);598 hdr = packet->hdr;599 lnh = ib_get_lnh(hdr);600 601 if (lnh == HFI1_LRH_BTH) {602 packet->ohdr = &hdr->u.oth;603 packet->grh = NULL;604 } else if (lnh == HFI1_LRH_GRH) {605 packet->ohdr = &hdr->u.l.oth;606 packet->grh = &hdr->u.l.grh;607 } else {608 goto next; /* just in case */609 }610 611 if (!hfi1_may_ecn(packet))612 goto next;613 614 bth1 = be32_to_cpu(packet->ohdr->bth[1]);615 qpn = bth1 & RVT_QPN_MASK;616 rcu_read_lock();617 qp = rvt_lookup_qpn(rdi, &ibp->rvp, qpn);618 619 if (!qp) {620 rcu_read_unlock();621 goto next;622 }623 624 hfi1_process_ecn_slowpath(qp, packet, true);625 rcu_read_unlock();626 627 /* turn off BECN, FECN */628 bth1 &= ~(IB_FECN_SMASK | IB_BECN_SMASK);629 packet->ohdr->bth[1] = cpu_to_be32(bth1);630next:631 update_ps_mdata(&mdata, rcd);632 }633}634 635static void process_rcv_qp_work(struct hfi1_packet *packet)636{637 struct rvt_qp *qp, *nqp;638 struct hfi1_ctxtdata *rcd = packet->rcd;639 640 /*641 * Iterate over all QPs waiting to respond.642 * The list won't change since the IRQ is only run on one CPU.643 */644 list_for_each_entry_safe(qp, nqp, &rcd->qp_wait_list, rspwait) {645 list_del_init(&qp->rspwait);646 if (qp->r_flags & RVT_R_RSP_NAK) {647 qp->r_flags &= ~RVT_R_RSP_NAK;648 packet->qp = qp;649 hfi1_send_rc_ack(packet, 0);650 }651 if (qp->r_flags & RVT_R_RSP_SEND) {652 unsigned long flags;653 654 qp->r_flags &= ~RVT_R_RSP_SEND;655 spin_lock_irqsave(&qp->s_lock, flags);656 if (ib_rvt_state_ops[qp->state] &657 RVT_PROCESS_OR_FLUSH_SEND)658 hfi1_schedule_send(qp);659 spin_unlock_irqrestore(&qp->s_lock, flags);660 }661 rvt_put_qp(qp);662 }663}664 665static noinline int max_packet_exceeded(struct hfi1_packet *packet, int thread)666{667 if (thread) {668 if ((packet->numpkt & (MAX_PKT_RECV_THREAD - 1)) == 0)669 /* allow defered processing */670 process_rcv_qp_work(packet);671 cond_resched();672 return RCV_PKT_OK;673 } else {674 this_cpu_inc(*packet->rcd->dd->rcv_limit);675 return RCV_PKT_LIMIT;676 }677}678 679static inline int check_max_packet(struct hfi1_packet *packet, int thread)680{681 int ret = RCV_PKT_OK;682 683 if (unlikely((packet->numpkt & (MAX_PKT_RECV - 1)) == 0))684 ret = max_packet_exceeded(packet, thread);685 return ret;686}687 688static noinline int skip_rcv_packet(struct hfi1_packet *packet, int thread)689{690 int ret;691 692 packet->rcd->dd->ctx0_seq_drop++;693 /* Set up for the next packet */694 packet->rhqoff += packet->rsize;695 if (packet->rhqoff >= packet->maxcnt)696 packet->rhqoff = 0;697 698 packet->numpkt++;699 ret = check_max_packet(packet, thread);700 701 packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +702 packet->rcd->rhf_offset;703 packet->rhf = rhf_to_cpu(packet->rhf_addr);704 705 return ret;706}707 708static void process_rcv_packet_napi(struct hfi1_packet *packet)709{710 packet->etype = rhf_rcv_type(packet->rhf);711 712 /* total length */713 packet->tlen = rhf_pkt_len(packet->rhf); /* in bytes */714 /* retrieve eager buffer details */715 packet->etail = rhf_egr_index(packet->rhf);716 packet->ebuf = get_egrbuf(packet->rcd, packet->rhf,717 &packet->updegr);718 /*719 * Prefetch the contents of the eager buffer. It is720 * OK to send a negative length to prefetch_range().721 * The +2 is the size of the RHF.722 */723 prefetch_range(packet->ebuf,724 packet->tlen - ((packet->rcd->rcvhdrqentsize -725 (rhf_hdrq_offset(packet->rhf)726 + 2)) * 4));727 728 packet->rcd->rhf_rcv_function_map[packet->etype](packet);729 packet->numpkt++;730 731 /* Set up for the next packet */732 packet->rhqoff += packet->rsize;733 if (packet->rhqoff >= packet->maxcnt)734 packet->rhqoff = 0;735 736 packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +737 packet->rcd->rhf_offset;738 packet->rhf = rhf_to_cpu(packet->rhf_addr);739}740 741static inline int process_rcv_packet(struct hfi1_packet *packet, int thread)742{743 int ret;744 745 packet->etype = rhf_rcv_type(packet->rhf);746 747 /* total length */748 packet->tlen = rhf_pkt_len(packet->rhf); /* in bytes */749 /* retrieve eager buffer details */750 packet->ebuf = NULL;751 if (rhf_use_egr_bfr(packet->rhf)) {752 packet->etail = rhf_egr_index(packet->rhf);753 packet->ebuf = get_egrbuf(packet->rcd, packet->rhf,754 &packet->updegr);755 /*756 * Prefetch the contents of the eager buffer. It is757 * OK to send a negative length to prefetch_range().758 * The +2 is the size of the RHF.759 */760 prefetch_range(packet->ebuf,761 packet->tlen - ((get_hdrqentsize(packet->rcd) -762 (rhf_hdrq_offset(packet->rhf)763 + 2)) * 4));764 }765 766 /*767 * Call a type specific handler for the packet. We768 * should be able to trust that etype won't be beyond769 * the range of valid indexes. If so something is really770 * wrong and we can probably just let things come771 * crashing down. There is no need to eat another772 * comparison in this performance critical code.773 */774 packet->rcd->rhf_rcv_function_map[packet->etype](packet);775 packet->numpkt++;776 777 /* Set up for the next packet */778 packet->rhqoff += packet->rsize;779 if (packet->rhqoff >= packet->maxcnt)780 packet->rhqoff = 0;781 782 ret = check_max_packet(packet, thread);783 784 packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +785 packet->rcd->rhf_offset;786 packet->rhf = rhf_to_cpu(packet->rhf_addr);787 788 return ret;789}790 791static inline void process_rcv_update(int last, struct hfi1_packet *packet)792{793 /*794 * Update head regs etc., every 16 packets, if not last pkt,795 * to help prevent rcvhdrq overflows, when many packets796 * are processed and queue is nearly full.797 * Don't request an interrupt for intermediate updates.798 */799 if (!last && !(packet->numpkt & 0xf)) {800 update_usrhead(packet->rcd, packet->rhqoff, packet->updegr,801 packet->etail, 0, 0);802 packet->updegr = 0;803 }804 packet->grh = NULL;805}806 807static inline void finish_packet(struct hfi1_packet *packet)808{809 /*810 * Nothing we need to free for the packet.811 *812 * The only thing we need to do is a final update and call for an813 * interrupt814 */815 update_usrhead(packet->rcd, hfi1_rcd_head(packet->rcd), packet->updegr,816 packet->etail, rcv_intr_dynamic, packet->numpkt);817}818 819/*820 * handle_receive_interrupt_napi_fp - receive a packet821 * @rcd: the context822 * @budget: polling budget823 *824 * Called from interrupt handler for receive interrupt.825 * This is the fast path interrupt handler826 * when executing napi soft irq environment.827 */828int handle_receive_interrupt_napi_fp(struct hfi1_ctxtdata *rcd, int budget)829{830 struct hfi1_packet packet;831 832 init_packet(rcd, &packet);833 if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf)))834 goto bail;835 836 while (packet.numpkt < budget) {837 process_rcv_packet_napi(&packet);838 if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))839 break;840 841 process_rcv_update(0, &packet);842 }843 hfi1_set_rcd_head(rcd, packet.rhqoff);844bail:845 finish_packet(&packet);846 return packet.numpkt;847}848 849/*850 * Handle receive interrupts when using the no dma rtail option.851 */852int handle_receive_interrupt_nodma_rtail(struct hfi1_ctxtdata *rcd, int thread)853{854 int last = RCV_PKT_OK;855 struct hfi1_packet packet;856 857 init_packet(rcd, &packet);858 if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf))) {859 last = RCV_PKT_DONE;860 goto bail;861 }862 863 prescan_rxq(rcd, &packet);864 865 while (last == RCV_PKT_OK) {866 last = process_rcv_packet(&packet, thread);867 if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))868 last = RCV_PKT_DONE;869 process_rcv_update(last, &packet);870 }871 process_rcv_qp_work(&packet);872 hfi1_set_rcd_head(rcd, packet.rhqoff);873bail:874 finish_packet(&packet);875 return last;876}877 878int handle_receive_interrupt_dma_rtail(struct hfi1_ctxtdata *rcd, int thread)879{880 u32 hdrqtail;881 int last = RCV_PKT_OK;882 struct hfi1_packet packet;883 884 init_packet(rcd, &packet);885 hdrqtail = get_rcvhdrtail(rcd);886 if (packet.rhqoff == hdrqtail) {887 last = RCV_PKT_DONE;888 goto bail;889 }890 smp_rmb(); /* prevent speculative reads of dma'ed hdrq */891 892 prescan_rxq(rcd, &packet);893 894 while (last == RCV_PKT_OK) {895 last = process_rcv_packet(&packet, thread);896 if (packet.rhqoff == hdrqtail)897 last = RCV_PKT_DONE;898 process_rcv_update(last, &packet);899 }900 process_rcv_qp_work(&packet);901 hfi1_set_rcd_head(rcd, packet.rhqoff);902bail:903 finish_packet(&packet);904 return last;905}906 907static void set_all_fastpath(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd)908{909 u16 i;910 911 /*912 * For dynamically allocated kernel contexts (like vnic) switch913 * interrupt handler only for that context. Otherwise, switch914 * interrupt handler for all statically allocated kernel contexts.915 */916 if (rcd->ctxt >= dd->first_dyn_alloc_ctxt && !rcd->is_vnic) {917 hfi1_rcd_get(rcd);918 hfi1_set_fast(rcd);919 hfi1_rcd_put(rcd);920 return;921 }922 923 for (i = HFI1_CTRL_CTXT + 1; i < dd->num_rcv_contexts; i++) {924 rcd = hfi1_rcd_get_by_index(dd, i);925 if (rcd && (i < dd->first_dyn_alloc_ctxt || rcd->is_vnic))926 hfi1_set_fast(rcd);927 hfi1_rcd_put(rcd);928 }929}930 931void set_all_slowpath(struct hfi1_devdata *dd)932{933 struct hfi1_ctxtdata *rcd;934 u16 i;935 936 /* HFI1_CTRL_CTXT must always use the slow path interrupt handler */937 for (i = HFI1_CTRL_CTXT + 1; i < dd->num_rcv_contexts; i++) {938 rcd = hfi1_rcd_get_by_index(dd, i);939 if (!rcd)940 continue;941 if (i < dd->first_dyn_alloc_ctxt || rcd->is_vnic)942 rcd->do_interrupt = rcd->slow_handler;943 944 hfi1_rcd_put(rcd);945 }946}947 948static bool __set_armed_to_active(struct hfi1_packet *packet)949{950 u8 etype = rhf_rcv_type(packet->rhf);951 u8 sc = SC15_PACKET;952 953 if (etype == RHF_RCV_TYPE_IB) {954 struct ib_header *hdr = hfi1_get_msgheader(packet->rcd,955 packet->rhf_addr);956 sc = hfi1_9B_get_sc5(hdr, packet->rhf);957 } else if (etype == RHF_RCV_TYPE_BYPASS) {958 struct hfi1_16b_header *hdr = hfi1_get_16B_header(959 packet->rcd,960 packet->rhf_addr);961 sc = hfi1_16B_get_sc(hdr);962 }963 if (sc != SC15_PACKET) {964 int hwstate = driver_lstate(packet->rcd->ppd);965 struct work_struct *lsaw =966 &packet->rcd->ppd->linkstate_active_work;967 968 if (hwstate != IB_PORT_ACTIVE) {969 dd_dev_info(packet->rcd->dd,970 "Unexpected link state %s\n",971 opa_lstate_name(hwstate));972 return false;973 }974 975 queue_work(packet->rcd->ppd->link_wq, lsaw);976 return true;977 }978 return false;979}980 981/**982 * set_armed_to_active - the fast path for armed to active983 * @packet: the packet structure984 *985 * Return true if packet processing needs to bail.986 */987static bool set_armed_to_active(struct hfi1_packet *packet)988{989 if (likely(packet->rcd->ppd->host_link_state != HLS_UP_ARMED))990 return false;991 return __set_armed_to_active(packet);992}993 994/*995 * handle_receive_interrupt - receive a packet996 * @rcd: the context997 *998 * Called from interrupt handler for errors or receive interrupt.999 * This is the slow path interrupt handler.1000 */1001int handle_receive_interrupt(struct hfi1_ctxtdata *rcd, int thread)1002{1003 struct hfi1_devdata *dd = rcd->dd;1004 u32 hdrqtail;1005 int needset, last = RCV_PKT_OK;1006 struct hfi1_packet packet;1007 int skip_pkt = 0;1008 1009 if (!rcd->rcvhdrq)1010 return RCV_PKT_OK;1011 /* Control context will always use the slow path interrupt handler */1012 needset = (rcd->ctxt == HFI1_CTRL_CTXT) ? 0 : 1;1013 1014 init_packet(rcd, &packet);1015 1016 if (!get_dma_rtail_setting(rcd)) {1017 if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf))) {1018 last = RCV_PKT_DONE;1019 goto bail;1020 }1021 hdrqtail = 0;1022 } else {1023 hdrqtail = get_rcvhdrtail(rcd);1024 if (packet.rhqoff == hdrqtail) {1025 last = RCV_PKT_DONE;1026 goto bail;1027 }1028 smp_rmb(); /* prevent speculative reads of dma'ed hdrq */1029 1030 /*1031 * Control context can potentially receive an invalid1032 * rhf. Drop such packets.1033 */1034 if (rcd->ctxt == HFI1_CTRL_CTXT)1035 if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf)))1036 skip_pkt = 1;1037 }1038 1039 prescan_rxq(rcd, &packet);1040 1041 while (last == RCV_PKT_OK) {1042 if (hfi1_need_drop(dd)) {1043 /* On to the next packet */1044 packet.rhqoff += packet.rsize;1045 packet.rhf_addr = (__le32 *)rcd->rcvhdrq +1046 packet.rhqoff +1047 rcd->rhf_offset;1048 packet.rhf = rhf_to_cpu(packet.rhf_addr);1049 1050 } else if (skip_pkt) {1051 last = skip_rcv_packet(&packet, thread);1052 skip_pkt = 0;1053 } else {1054 if (set_armed_to_active(&packet))1055 goto bail;1056 last = process_rcv_packet(&packet, thread);1057 }1058 1059 if (!get_dma_rtail_setting(rcd)) {1060 if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))1061 last = RCV_PKT_DONE;1062 } else {1063 if (packet.rhqoff == hdrqtail)1064 last = RCV_PKT_DONE;1065 /*1066 * Control context can potentially receive an invalid1067 * rhf. Drop such packets.1068 */1069 if (rcd->ctxt == HFI1_CTRL_CTXT) {1070 bool lseq;1071 1072 lseq = hfi1_seq_incr(rcd,1073 rhf_rcv_seq(packet.rhf));1074 if (!last && lseq)1075 skip_pkt = 1;1076 }1077 }1078 1079 if (needset) {1080 needset = false;1081 set_all_fastpath(dd, rcd);1082 }1083 process_rcv_update(last, &packet);1084 }1085 1086 process_rcv_qp_work(&packet);1087 hfi1_set_rcd_head(rcd, packet.rhqoff);1088 1089bail:1090 /*1091 * Always write head at end, and setup rcv interrupt, even1092 * if no packets were processed.1093 */1094 finish_packet(&packet);1095 return last;1096}1097 1098/*1099 * handle_receive_interrupt_napi_sp - receive a packet1100 * @rcd: the context1101 * @budget: polling budget1102 *1103 * Called from interrupt handler for errors or receive interrupt.1104 * This is the slow path interrupt handler1105 * when executing napi soft irq environment.1106 */1107int handle_receive_interrupt_napi_sp(struct hfi1_ctxtdata *rcd, int budget)1108{1109 struct hfi1_devdata *dd = rcd->dd;1110 int last = RCV_PKT_OK;1111 bool needset = true;1112 struct hfi1_packet packet;1113 1114 init_packet(rcd, &packet);1115 if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf)))1116 goto bail;1117 1118 while (last != RCV_PKT_DONE && packet.numpkt < budget) {1119 if (hfi1_need_drop(dd)) {1120 /* On to the next packet */1121 packet.rhqoff += packet.rsize;1122 packet.rhf_addr = (__le32 *)rcd->rcvhdrq +1123 packet.rhqoff +1124 rcd->rhf_offset;1125 packet.rhf = rhf_to_cpu(packet.rhf_addr);1126 1127 } else {1128 if (set_armed_to_active(&packet))1129 goto bail;1130 process_rcv_packet_napi(&packet);1131 }1132 1133 if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))1134 last = RCV_PKT_DONE;1135 1136 if (needset) {1137 needset = false;1138 set_all_fastpath(dd, rcd);1139 }1140 1141 process_rcv_update(last, &packet);1142 }1143 1144 hfi1_set_rcd_head(rcd, packet.rhqoff);1145 1146bail:1147 /*1148 * Always write head at end, and setup rcv interrupt, even1149 * if no packets were processed.1150 */1151 finish_packet(&packet);1152 return packet.numpkt;1153}1154 1155/*1156 * We may discover in the interrupt that the hardware link state has1157 * changed from ARMED to ACTIVE (due to the arrival of a non-SC15 packet),1158 * and we need to update the driver's notion of the link state. We cannot1159 * run set_link_state from interrupt context, so we queue this function on1160 * a workqueue.1161 *1162 * We delay the regular interrupt processing until after the state changes1163 * so that the link will be in the correct state by the time any application1164 * we wake up attempts to send a reply to any message it received.1165 * (Subsequent receive interrupts may possibly force the wakeup before we1166 * update the link state.)1167 *1168 * The rcd is freed in hfi1_free_ctxtdata after hfi1_postinit_cleanup invokes1169 * dd->f_cleanup(dd) to disable the interrupt handler and flush workqueues,1170 * so we're safe from use-after-free of the rcd.1171 */1172void receive_interrupt_work(struct work_struct *work)1173{1174 struct hfi1_pportdata *ppd = container_of(work, struct hfi1_pportdata,1175 linkstate_active_work);1176 struct hfi1_devdata *dd = ppd->dd;1177 struct hfi1_ctxtdata *rcd;1178 u16 i;1179 1180 /* Received non-SC15 packet implies neighbor_normal */1181 ppd->neighbor_normal = 1;1182 set_link_state(ppd, HLS_UP_ACTIVE);1183 1184 /*1185 * Interrupt all statically allocated kernel contexts that could1186 * have had an interrupt during auto activation.1187 */1188 for (i = HFI1_CTRL_CTXT; i < dd->first_dyn_alloc_ctxt; i++) {1189 rcd = hfi1_rcd_get_by_index(dd, i);1190 if (rcd)1191 force_recv_intr(rcd);1192 hfi1_rcd_put(rcd);1193 }1194}1195 1196/*1197 * Convert a given MTU size to the on-wire MAD packet enumeration.1198 * Return -1 if the size is invalid.1199 */1200int mtu_to_enum(u32 mtu, int default_if_bad)1201{1202 switch (mtu) {1203 case 0: return OPA_MTU_0;1204 case 256: return OPA_MTU_256;1205 case 512: return OPA_MTU_512;1206 case 1024: return OPA_MTU_1024;1207 case 2048: return OPA_MTU_2048;1208 case 4096: return OPA_MTU_4096;1209 case 8192: return OPA_MTU_8192;1210 case 10240: return OPA_MTU_10240;1211 }1212 return default_if_bad;1213}1214 1215u16 enum_to_mtu(int mtu)1216{1217 switch (mtu) {1218 case OPA_MTU_0: return 0;1219 case OPA_MTU_256: return 256;1220 case OPA_MTU_512: return 512;1221 case OPA_MTU_1024: return 1024;1222 case OPA_MTU_2048: return 2048;1223 case OPA_MTU_4096: return 4096;1224 case OPA_MTU_8192: return 8192;1225 case OPA_MTU_10240: return 10240;1226 default: return 0xffff;1227 }1228}1229 1230/*1231 * set_mtu - set the MTU1232 * @ppd: the per port data1233 *1234 * We can handle "any" incoming size, the issue here is whether we1235 * need to restrict our outgoing size. We do not deal with what happens1236 * to programs that are already running when the size changes.1237 */1238int set_mtu(struct hfi1_pportdata *ppd)1239{1240 struct hfi1_devdata *dd = ppd->dd;1241 int i, drain, ret = 0, is_up = 0;1242 1243 ppd->ibmtu = 0;1244 for (i = 0; i < ppd->vls_supported; i++)1245 if (ppd->ibmtu < dd->vld[i].mtu)1246 ppd->ibmtu = dd->vld[i].mtu;1247 ppd->ibmaxlen = ppd->ibmtu + lrh_max_header_bytes(ppd->dd);1248 1249 mutex_lock(&ppd->hls_lock);1250 if (ppd->host_link_state == HLS_UP_INIT ||1251 ppd->host_link_state == HLS_UP_ARMED ||1252 ppd->host_link_state == HLS_UP_ACTIVE)1253 is_up = 1;1254 1255 drain = !is_ax(dd) && is_up;1256 1257 if (drain)1258 /*1259 * MTU is specified per-VL. To ensure that no packet gets1260 * stuck (due, e.g., to the MTU for the packet's VL being1261 * reduced), empty the per-VL FIFOs before adjusting MTU.1262 */1263 ret = stop_drain_data_vls(dd);1264 1265 if (ret) {1266 dd_dev_err(dd, "%s: cannot stop/drain VLs - refusing to change per-VL MTUs\n",1267 __func__);1268 goto err;1269 }1270 1271 hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_MTU, 0);1272 1273 if (drain)1274 open_fill_data_vls(dd); /* reopen all VLs */1275 1276err:1277 mutex_unlock(&ppd->hls_lock);1278 1279 return ret;1280}1281 1282int hfi1_set_lid(struct hfi1_pportdata *ppd, u32 lid, u8 lmc)1283{1284 struct hfi1_devdata *dd = ppd->dd;1285 1286 ppd->lid = lid;1287 ppd->lmc = lmc;1288 hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_LIDLMC, 0);1289 1290 dd_dev_info(dd, "port %u: got a lid: 0x%x\n", ppd->port, lid);1291 1292 return 0;1293}1294 1295void shutdown_led_override(struct hfi1_pportdata *ppd)1296{1297 struct hfi1_devdata *dd = ppd->dd;1298 1299 /*1300 * This pairs with the memory barrier in hfi1_start_led_override to1301 * ensure that we read the correct state of LED beaconing represented1302 * by led_override_timer_active1303 */1304 smp_rmb();1305 if (atomic_read(&ppd->led_override_timer_active)) {1306 del_timer_sync(&ppd->led_override_timer);1307 atomic_set(&ppd->led_override_timer_active, 0);1308 /* Ensure the atomic_set is visible to all CPUs */1309 smp_wmb();1310 }1311 1312 /* Hand control of the LED to the DC for normal operation */1313 write_csr(dd, DCC_CFG_LED_CNTRL, 0);1314}1315 1316static void run_led_override(struct timer_list *t)1317{1318 struct hfi1_pportdata *ppd = from_timer(ppd, t, led_override_timer);1319 struct hfi1_devdata *dd = ppd->dd;1320 unsigned long timeout;1321 int phase_idx;1322 1323 if (!(dd->flags & HFI1_INITTED))1324 return;1325 1326 phase_idx = ppd->led_override_phase & 1;1327 1328 setextled(dd, phase_idx);1329 1330 timeout = ppd->led_override_vals[phase_idx];1331 1332 /* Set up for next phase */1333 ppd->led_override_phase = !ppd->led_override_phase;1334 1335 mod_timer(&ppd->led_override_timer, jiffies + timeout);1336}1337 1338/*1339 * To have the LED blink in a particular pattern, provide timeon and timeoff1340 * in milliseconds.1341 * To turn off custom blinking and return to normal operation, use1342 * shutdown_led_override()1343 */1344void hfi1_start_led_override(struct hfi1_pportdata *ppd, unsigned int timeon,1345 unsigned int timeoff)1346{1347 if (!(ppd->dd->flags & HFI1_INITTED))1348 return;1349 1350 /* Convert to jiffies for direct use in timer */1351 ppd->led_override_vals[0] = msecs_to_jiffies(timeoff);1352 ppd->led_override_vals[1] = msecs_to_jiffies(timeon);1353 1354 /* Arbitrarily start from LED on phase */1355 ppd->led_override_phase = 1;1356 1357 /*1358 * If the timer has not already been started, do so. Use a "quick"1359 * timeout so the handler will be called soon to look at our request.1360 */1361 if (!timer_pending(&ppd->led_override_timer)) {1362 timer_setup(&ppd->led_override_timer, run_led_override, 0);1363 ppd->led_override_timer.expires = jiffies + 1;1364 add_timer(&ppd->led_override_timer);1365 atomic_set(&ppd->led_override_timer_active, 1);1366 /* Ensure the atomic_set is visible to all CPUs */1367 smp_wmb();1368 }1369}1370 1371/**1372 * hfi1_reset_device - reset the chip if possible1373 * @unit: the device to reset1374 *1375 * Whether or not reset is successful, we attempt to re-initialize the chip1376 * (that is, much like a driver unload/reload). We clear the INITTED flag1377 * so that the various entry points will fail until we reinitialize. For1378 * now, we only allow this if no user contexts are open that use chip resources1379 */1380int hfi1_reset_device(int unit)1381{1382 int ret;1383 struct hfi1_devdata *dd = hfi1_lookup(unit);1384 struct hfi1_pportdata *ppd;1385 int pidx;1386 1387 if (!dd) {1388 ret = -ENODEV;1389 goto bail;1390 }1391 1392 dd_dev_info(dd, "Reset on unit %u requested\n", unit);1393 1394 if (!dd->kregbase1 || !(dd->flags & HFI1_PRESENT)) {1395 dd_dev_info(dd,1396 "Invalid unit number %u or not initialized or not present\n",1397 unit);1398 ret = -ENXIO;1399 goto bail;1400 }1401 1402 /* If there are any user/vnic contexts, we cannot reset */1403 mutex_lock(&hfi1_mutex);1404 if (dd->rcd)1405 if (hfi1_stats.sps_ctxts) {1406 mutex_unlock(&hfi1_mutex);1407 ret = -EBUSY;1408 goto bail;1409 }1410 mutex_unlock(&hfi1_mutex);1411 1412 for (pidx = 0; pidx < dd->num_pports; ++pidx) {1413 ppd = dd->pport + pidx;1414 1415 shutdown_led_override(ppd);1416 }1417 if (dd->flags & HFI1_HAS_SEND_DMA)1418 sdma_exit(dd);1419 1420 hfi1_reset_cpu_counters(dd);1421 1422 ret = hfi1_init(dd, 1);1423 1424 if (ret)1425 dd_dev_err(dd,1426 "Reinitialize unit %u after reset failed with %d\n",1427 unit, ret);1428 else1429 dd_dev_info(dd, "Reinitialized unit %u after resetting\n",1430 unit);1431 1432bail:1433 return ret;1434}1435 1436static inline void hfi1_setup_ib_header(struct hfi1_packet *packet)1437{1438 packet->hdr = (struct hfi1_ib_message_header *)1439 hfi1_get_msgheader(packet->rcd,1440 packet->rhf_addr);1441 packet->hlen = (u8 *)packet->rhf_addr - (u8 *)packet->hdr;1442}1443 1444static int hfi1_bypass_ingress_pkt_check(struct hfi1_packet *packet)1445{1446 struct hfi1_pportdata *ppd = packet->rcd->ppd;1447 1448 /* slid and dlid cannot be 0 */1449 if ((!packet->slid) || (!packet->dlid))1450 return -EINVAL;1451 1452 /* Compare port lid with incoming packet dlid */1453 if ((!(hfi1_is_16B_mcast(packet->dlid))) &&1454 (packet->dlid !=1455 opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE), 16B))) {1456 if ((packet->dlid & ~((1 << ppd->lmc) - 1)) != ppd->lid)1457 return -EINVAL;1458 }1459 1460 /* No multicast packets with SC15 */1461 if ((hfi1_is_16B_mcast(packet->dlid)) && (packet->sc == 0xF))1462 return -EINVAL;1463 1464 /* Packets with permissive DLID always on SC15 */1465 if ((packet->dlid == opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE),1466 16B)) &&1467 (packet->sc != 0xF))1468 return -EINVAL;1469 1470 return 0;1471}1472 1473static int hfi1_setup_9B_packet(struct hfi1_packet *packet)1474{1475 struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);1476 struct ib_header *hdr;1477 u8 lnh;1478 1479 hfi1_setup_ib_header(packet);1480 hdr = packet->hdr;1481 1482 lnh = ib_get_lnh(hdr);1483 if (lnh == HFI1_LRH_BTH) {1484 packet->ohdr = &hdr->u.oth;1485 packet->grh = NULL;1486 } else if (lnh == HFI1_LRH_GRH) {1487 u32 vtf;1488 1489 packet->ohdr = &hdr->u.l.oth;1490 packet->grh = &hdr->u.l.grh;1491 if (packet->grh->next_hdr != IB_GRH_NEXT_HDR)1492 goto drop;1493 vtf = be32_to_cpu(packet->grh->version_tclass_flow);1494 if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)1495 goto drop;1496 } else {1497 goto drop;1498 }1499 1500 /* Query commonly used fields from packet header */1501 packet->payload = packet->ebuf;1502 packet->opcode = ib_bth_get_opcode(packet->ohdr);1503 packet->slid = ib_get_slid(hdr);1504 packet->dlid = ib_get_dlid(hdr);1505 if (unlikely((packet->dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE)) &&1506 (packet->dlid != be16_to_cpu(IB_LID_PERMISSIVE))))1507 packet->dlid += opa_get_mcast_base(OPA_MCAST_NR) -1508 be16_to_cpu(IB_MULTICAST_LID_BASE);1509 packet->sl = ib_get_sl(hdr);1510 packet->sc = hfi1_9B_get_sc5(hdr, packet->rhf);1511 packet->pad = ib_bth_get_pad(packet->ohdr);1512 packet->extra_byte = 0;1513 packet->pkey = ib_bth_get_pkey(packet->ohdr);1514 packet->migrated = ib_bth_is_migration(packet->ohdr);1515 1516 return 0;1517drop:1518 ibp->rvp.n_pkt_drops++;1519 return -EINVAL;1520}1521 1522static int hfi1_setup_bypass_packet(struct hfi1_packet *packet)1523{1524 /*1525 * Bypass packets have a different header/payload split1526 * compared to an IB packet.1527 * Current split is set such that 16 bytes of the actual1528 * header is in the header buffer and the remining is in1529 * the eager buffer. We chose 16 since hfi1 driver only1530 * supports 16B bypass packets and we will be able to1531 * receive the entire LRH with such a split.1532 */1533 1534 struct hfi1_ctxtdata *rcd = packet->rcd;1535 struct hfi1_pportdata *ppd = rcd->ppd;1536 struct hfi1_ibport *ibp = &ppd->ibport_data;1537 u8 l4;1538 1539 packet->hdr = (struct hfi1_16b_header *)1540 hfi1_get_16B_header(packet->rcd,1541 packet->rhf_addr);1542 l4 = hfi1_16B_get_l4(packet->hdr);1543 if (l4 == OPA_16B_L4_IB_LOCAL) {1544 packet->ohdr = packet->ebuf;1545 packet->grh = NULL;1546 packet->opcode = ib_bth_get_opcode(packet->ohdr);1547 packet->pad = hfi1_16B_bth_get_pad(packet->ohdr);1548 /* hdr_len_by_opcode already has an IB LRH factored in */1549 packet->hlen = hdr_len_by_opcode[packet->opcode] +1550 (LRH_16B_BYTES - LRH_9B_BYTES);1551 packet->migrated = opa_bth_is_migration(packet->ohdr);1552 } else if (l4 == OPA_16B_L4_IB_GLOBAL) {1553 u32 vtf;1554 u8 grh_len = sizeof(struct ib_grh);1555 1556 packet->ohdr = packet->ebuf + grh_len;1557 packet->grh = packet->ebuf;1558 packet->opcode = ib_bth_get_opcode(packet->ohdr);1559 packet->pad = hfi1_16B_bth_get_pad(packet->ohdr);1560 /* hdr_len_by_opcode already has an IB LRH factored in */1561 packet->hlen = hdr_len_by_opcode[packet->opcode] +1562 (LRH_16B_BYTES - LRH_9B_BYTES) + grh_len;1563 packet->migrated = opa_bth_is_migration(packet->ohdr);1564 1565 if (packet->grh->next_hdr != IB_GRH_NEXT_HDR)1566 goto drop;1567 vtf = be32_to_cpu(packet->grh->version_tclass_flow);1568 if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)1569 goto drop;1570 } else if (l4 == OPA_16B_L4_FM) {1571 packet->mgmt = packet->ebuf;1572 packet->ohdr = NULL;1573 packet->grh = NULL;1574 packet->opcode = IB_OPCODE_UD_SEND_ONLY;1575 packet->pad = OPA_16B_L4_FM_PAD;1576 packet->hlen = OPA_16B_L4_FM_HLEN;1577 packet->migrated = false;1578 } else {1579 goto drop;1580 }1581 1582 /* Query commonly used fields from packet header */1583 packet->payload = packet->ebuf + packet->hlen - LRH_16B_BYTES;1584 packet->slid = hfi1_16B_get_slid(packet->hdr);1585 packet->dlid = hfi1_16B_get_dlid(packet->hdr);1586 if (unlikely(hfi1_is_16B_mcast(packet->dlid)))1587 packet->dlid += opa_get_mcast_base(OPA_MCAST_NR) -1588 opa_get_lid(opa_get_mcast_base(OPA_MCAST_NR),1589 16B);1590 packet->sc = hfi1_16B_get_sc(packet->hdr);1591 packet->sl = ibp->sc_to_sl[packet->sc];1592 packet->extra_byte = SIZE_OF_LT;1593 packet->pkey = hfi1_16B_get_pkey(packet->hdr);1594 1595 if (hfi1_bypass_ingress_pkt_check(packet))1596 goto drop;1597 1598 return 0;1599drop:1600 hfi1_cdbg(PKT, "%s: packet dropped", __func__);1601 ibp->rvp.n_pkt_drops++;1602 return -EINVAL;1603}1604 1605static void show_eflags_errs(struct hfi1_packet *packet)1606{1607 struct hfi1_ctxtdata *rcd = packet->rcd;1608 u32 rte = rhf_rcv_type_err(packet->rhf);1609 1610 dd_dev_err(rcd->dd,1611 "receive context %d: rhf 0x%016llx, errs [ %s%s%s%s%s%s%s] rte 0x%x\n",1612 rcd->ctxt, packet->rhf,1613 packet->rhf & RHF_K_HDR_LEN_ERR ? "k_hdr_len " : "",1614 packet->rhf & RHF_DC_UNC_ERR ? "dc_unc " : "",1615 packet->rhf & RHF_DC_ERR ? "dc " : "",1616 packet->rhf & RHF_TID_ERR ? "tid " : "",1617 packet->rhf & RHF_LEN_ERR ? "len " : "",1618 packet->rhf & RHF_ECC_ERR ? "ecc " : "",1619 packet->rhf & RHF_ICRC_ERR ? "icrc " : "",1620 rte);1621}1622 1623void handle_eflags(struct hfi1_packet *packet)1624{1625 struct hfi1_ctxtdata *rcd = packet->rcd;1626 1627 rcv_hdrerr(rcd, rcd->ppd, packet);1628 if (rhf_err_flags(packet->rhf))1629 show_eflags_errs(packet);1630}1631 1632static void hfi1_ipoib_ib_rcv(struct hfi1_packet *packet)1633{1634 struct hfi1_ibport *ibp;1635 struct net_device *netdev;1636 struct hfi1_ctxtdata *rcd = packet->rcd;1637 struct napi_struct *napi = rcd->napi;1638 struct sk_buff *skb;1639 struct hfi1_netdev_rxq *rxq = container_of(napi,1640 struct hfi1_netdev_rxq, napi);1641 u32 extra_bytes;1642 u32 tlen, qpnum;1643 bool do_work, do_cnp;1644 1645 trace_hfi1_rcvhdr(packet);1646 1647 hfi1_setup_ib_header(packet);1648 1649 packet->ohdr = &((struct ib_header *)packet->hdr)->u.oth;1650 packet->grh = NULL;1651 1652 if (unlikely(rhf_err_flags(packet->rhf))) {1653 handle_eflags(packet);1654 return;1655 }1656 1657 qpnum = ib_bth_get_qpn(packet->ohdr);1658 netdev = hfi1_netdev_get_data(rcd->dd, qpnum);1659 if (!netdev)1660 goto drop_no_nd;1661 1662 trace_input_ibhdr(rcd->dd, packet, !!(rhf_dc_info(packet->rhf)));1663 trace_ctxt_rsm_hist(rcd->ctxt);1664 1665 /* handle congestion notifications */1666 do_work = hfi1_may_ecn(packet);1667 if (unlikely(do_work)) {1668 do_cnp = (packet->opcode != IB_OPCODE_CNP);1669 (void)hfi1_process_ecn_slowpath(hfi1_ipoib_priv(netdev)->qp,1670 packet, do_cnp);1671 }1672 1673 /*1674 * We have split point after last byte of DETH1675 * lets strip padding and CRC and ICRC.1676 * tlen is whole packet len so we need to1677 * subtract header size as well.1678 */1679 tlen = packet->tlen;1680 extra_bytes = ib_bth_get_pad(packet->ohdr) + (SIZE_OF_CRC << 2) +1681 packet->hlen;1682 if (unlikely(tlen < extra_bytes))1683 goto drop;1684 1685 tlen -= extra_bytes;1686 1687 skb = hfi1_ipoib_prepare_skb(rxq, tlen, packet->ebuf);1688 if (unlikely(!skb))1689 goto drop;1690 1691 dev_sw_netstats_rx_add(netdev, skb->len);1692 1693 skb->dev = netdev;1694 skb->pkt_type = PACKET_HOST;1695 netif_receive_skb(skb);1696 1697 return;1698 1699drop:1700 ++netdev->stats.rx_dropped;1701drop_no_nd:1702 ibp = rcd_to_iport(packet->rcd);1703 ++ibp->rvp.n_pkt_drops;1704}1705 1706/*1707 * The following functions are called by the interrupt handler. They are type1708 * specific handlers for each packet type.1709 */1710static void process_receive_ib(struct hfi1_packet *packet)1711{1712 if (hfi1_setup_9B_packet(packet))1713 return;1714 1715 if (unlikely(hfi1_dbg_should_fault_rx(packet)))1716 return;1717 1718 trace_hfi1_rcvhdr(packet);1719 1720 if (unlikely(rhf_err_flags(packet->rhf))) {1721 handle_eflags(packet);1722 return;1723 }1724 1725 hfi1_ib_rcv(packet);1726}1727 1728static void process_receive_bypass(struct hfi1_packet *packet)1729{1730 struct hfi1_devdata *dd = packet->rcd->dd;1731 1732 if (hfi1_setup_bypass_packet(packet))1733 return;1734 1735 trace_hfi1_rcvhdr(packet);1736 1737 if (unlikely(rhf_err_flags(packet->rhf))) {1738 handle_eflags(packet);1739 return;1740 }1741 1742 if (hfi1_16B_get_l2(packet->hdr) == 0x2) {1743 hfi1_16B_rcv(packet);1744 } else {1745 dd_dev_err(dd,1746 "Bypass packets other than 16B are not supported in normal operation. Dropping\n");1747 incr_cntr64(&dd->sw_rcv_bypass_packet_errors);1748 if (!(dd->err_info_rcvport.status_and_code &1749 OPA_EI_STATUS_SMASK)) {1750 u64 *flits = packet->ebuf;1751 1752 if (flits && !(packet->rhf & RHF_LEN_ERR)) {1753 dd->err_info_rcvport.packet_flit1 = flits[0];1754 dd->err_info_rcvport.packet_flit2 =1755 packet->tlen > sizeof(flits[0]) ?1756 flits[1] : 0;1757 }1758 dd->err_info_rcvport.status_and_code |=1759 (OPA_EI_STATUS_SMASK | BAD_L2_ERR);1760 }1761 }1762}1763 1764static void process_receive_error(struct hfi1_packet *packet)1765{1766 /* KHdrHCRCErr -- KDETH packet with a bad HCRC */1767 if (unlikely(1768 hfi1_dbg_fault_suppress_err(&packet->rcd->dd->verbs_dev) &&1769 (rhf_rcv_type_err(packet->rhf) == RHF_RCV_TYPE_ERROR ||1770 packet->rhf & RHF_DC_ERR)))1771 return;1772 1773 hfi1_setup_ib_header(packet);1774 handle_eflags(packet);1775 1776 if (unlikely(rhf_err_flags(packet->rhf)))1777 dd_dev_err(packet->rcd->dd,1778 "Unhandled error packet received. Dropping.\n");1779}1780 1781static void kdeth_process_expected(struct hfi1_packet *packet)1782{1783 hfi1_setup_9B_packet(packet);1784 if (unlikely(hfi1_dbg_should_fault_rx(packet)))1785 return;1786 1787 if (unlikely(rhf_err_flags(packet->rhf))) {1788 struct hfi1_ctxtdata *rcd = packet->rcd;1789 1790 if (hfi1_handle_kdeth_eflags(rcd, rcd->ppd, packet))1791 return;1792 }1793 1794 hfi1_kdeth_expected_rcv(packet);1795}1796 1797static void kdeth_process_eager(struct hfi1_packet *packet)1798{1799 hfi1_setup_9B_packet(packet);1800 if (unlikely(hfi1_dbg_should_fault_rx(packet)))1801 return;1802 1803 trace_hfi1_rcvhdr(packet);1804 if (unlikely(rhf_err_flags(packet->rhf))) {1805 struct hfi1_ctxtdata *rcd = packet->rcd;1806 1807 show_eflags_errs(packet);1808 if (hfi1_handle_kdeth_eflags(rcd, rcd->ppd, packet))1809 return;1810 }1811 1812 hfi1_kdeth_eager_rcv(packet);1813}1814 1815static void process_receive_invalid(struct hfi1_packet *packet)1816{1817 dd_dev_err(packet->rcd->dd, "Invalid packet type %d. Dropping\n",1818 rhf_rcv_type(packet->rhf));1819}1820 1821#define HFI1_RCVHDR_DUMP_MAX 51822 1823void seqfile_dump_rcd(struct seq_file *s, struct hfi1_ctxtdata *rcd)1824{1825 struct hfi1_packet packet;1826 struct ps_mdata mdata;1827 int i;1828 1829 seq_printf(s, "Rcd %u: RcvHdr cnt %u entsize %u %s ctrl 0x%08llx status 0x%08llx, head %llu tail %llu sw head %u\n",1830 rcd->ctxt, get_hdrq_cnt(rcd), get_hdrqentsize(rcd),1831 get_dma_rtail_setting(rcd) ?1832 "dma_rtail" : "nodma_rtail",1833 read_kctxt_csr(rcd->dd, rcd->ctxt, RCV_CTXT_CTRL),1834 read_kctxt_csr(rcd->dd, rcd->ctxt, RCV_CTXT_STATUS),1835 read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_HEAD) &1836 RCV_HDR_HEAD_HEAD_MASK,1837 read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_TAIL),1838 rcd->head);1839 1840 init_packet(rcd, &packet);1841 init_ps_mdata(&mdata, &packet);1842 1843 for (i = 0; i < HFI1_RCVHDR_DUMP_MAX; i++) {1844 __le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head +1845 rcd->rhf_offset;1846 struct ib_header *hdr;1847 u64 rhf = rhf_to_cpu(rhf_addr);1848 u32 etype = rhf_rcv_type(rhf), qpn;1849 u8 opcode;1850 u32 psn;1851 u8 lnh;1852 1853 if (ps_done(&mdata, rhf, rcd))1854 break;1855 1856 if (ps_skip(&mdata, rhf, rcd))1857 goto next;1858 1859 if (etype > RHF_RCV_TYPE_IB)1860 goto next;1861 1862 packet.hdr = hfi1_get_msgheader(rcd, rhf_addr);1863 hdr = packet.hdr;1864 1865 lnh = be16_to_cpu(hdr->lrh[0]) & 3;1866 1867 if (lnh == HFI1_LRH_BTH)1868 packet.ohdr = &hdr->u.oth;1869 else if (lnh == HFI1_LRH_GRH)1870 packet.ohdr = &hdr->u.l.oth;1871 else1872 goto next; /* just in case */1873 1874 opcode = (be32_to_cpu(packet.ohdr->bth[0]) >> 24);1875 qpn = be32_to_cpu(packet.ohdr->bth[1]) & RVT_QPN_MASK;1876 psn = mask_psn(be32_to_cpu(packet.ohdr->bth[2]));1877 1878 seq_printf(s, "\tEnt %u: opcode 0x%x, qpn 0x%x, psn 0x%x\n",1879 mdata.ps_head, opcode, qpn, psn);1880next:1881 update_ps_mdata(&mdata, rcd);1882 }1883}1884 1885const rhf_rcv_function_ptr normal_rhf_rcv_functions[] = {1886 [RHF_RCV_TYPE_EXPECTED] = kdeth_process_expected,1887 [RHF_RCV_TYPE_EAGER] = kdeth_process_eager,1888 [RHF_RCV_TYPE_IB] = process_receive_ib,1889 [RHF_RCV_TYPE_ERROR] = process_receive_error,1890 [RHF_RCV_TYPE_BYPASS] = process_receive_bypass,1891 [RHF_RCV_TYPE_INVALID5] = process_receive_invalid,1892 [RHF_RCV_TYPE_INVALID6] = process_receive_invalid,1893 [RHF_RCV_TYPE_INVALID7] = process_receive_invalid,1894};1895 1896const rhf_rcv_function_ptr netdev_rhf_rcv_functions[] = {1897 [RHF_RCV_TYPE_EXPECTED] = process_receive_invalid,1898 [RHF_RCV_TYPE_EAGER] = process_receive_invalid,1899 [RHF_RCV_TYPE_IB] = hfi1_ipoib_ib_rcv,1900 [RHF_RCV_TYPE_ERROR] = process_receive_error,1901 [RHF_RCV_TYPE_BYPASS] = hfi1_vnic_bypass_rcv,1902 [RHF_RCV_TYPE_INVALID5] = process_receive_invalid,1903 [RHF_RCV_TYPE_INVALID6] = process_receive_invalid,1904 [RHF_RCV_TYPE_INVALID7] = process_receive_invalid,1905};1906