diff options
Diffstat (limited to 'drivers/infiniband/hw/hfi1/driver.c')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/driver.c | 1905 |
1 files changed, 1905 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/hfi1/driver.c b/drivers/infiniband/hw/hfi1/driver.c new file mode 100644 index 000000000..8e71bef9d --- /dev/null +++ b/drivers/infiniband/hw/hfi1/driver.c @@ -0,0 +1,1905 @@ +// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause +/* + * Copyright(c) 2015-2020 Intel Corporation. + * Copyright(c) 2021 Cornelis Networks. + */ + +#include <linux/spinlock.h> +#include <linux/pci.h> +#include <linux/io.h> +#include <linux/delay.h> +#include <linux/netdevice.h> +#include <linux/vmalloc.h> +#include <linux/module.h> +#include <linux/prefetch.h> +#include <rdma/ib_verbs.h> +#include <linux/etherdevice.h> + +#include "hfi.h" +#include "trace.h" +#include "qp.h" +#include "sdma.h" +#include "debugfs.h" +#include "vnic.h" +#include "fault.h" + +#include "ipoib.h" +#include "netdev.h" + +#undef pr_fmt +#define pr_fmt(fmt) DRIVER_NAME ": " fmt + +DEFINE_MUTEX(hfi1_mutex); /* general driver use */ + +unsigned int hfi1_max_mtu = HFI1_DEFAULT_MAX_MTU; +module_param_named(max_mtu, hfi1_max_mtu, uint, S_IRUGO); +MODULE_PARM_DESC(max_mtu, "Set max MTU bytes, default is " __stringify( + HFI1_DEFAULT_MAX_MTU)); + +unsigned int hfi1_cu = 1; +module_param_named(cu, hfi1_cu, uint, S_IRUGO); +MODULE_PARM_DESC(cu, "Credit return units"); + +unsigned long hfi1_cap_mask = HFI1_CAP_MASK_DEFAULT; +static int hfi1_caps_set(const char *val, const struct kernel_param *kp); +static int hfi1_caps_get(char *buffer, const struct kernel_param *kp); +static const struct kernel_param_ops cap_ops = { + .set = hfi1_caps_set, + .get = hfi1_caps_get +}; +module_param_cb(cap_mask, &cap_ops, &hfi1_cap_mask, S_IWUSR | S_IRUGO); +MODULE_PARM_DESC(cap_mask, "Bit mask of enabled/disabled HW features"); + +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_DESCRIPTION("Cornelis Omni-Path Express driver"); + +/* + * MAX_PKT_RCV is the max # if packets processed per receive interrupt. + */ +#define MAX_PKT_RECV 64 +/* + * MAX_PKT_THREAD_RCV is the max # of packets processed before + * the qp_wait_list queue is flushed. + */ +#define MAX_PKT_RECV_THREAD (MAX_PKT_RECV * 4) +#define EGR_HEAD_UPDATE_THRESHOLD 16 + +struct hfi1_ib_stats hfi1_stats; + +static int hfi1_caps_set(const char *val, const struct kernel_param *kp) +{ + int ret = 0; + unsigned long *cap_mask_ptr = (unsigned long *)kp->arg, + cap_mask = *cap_mask_ptr, value, diff, + write_mask = ((HFI1_CAP_WRITABLE_MASK << HFI1_CAP_USER_SHIFT) | + HFI1_CAP_WRITABLE_MASK); + + ret = kstrtoul(val, 0, &value); + if (ret) { + pr_warn("Invalid module parameter value for 'cap_mask'\n"); + goto done; + } + /* Get the changed bits (except the locked bit) */ + diff = value ^ (cap_mask & ~HFI1_CAP_LOCKED_SMASK); + + /* Remove any bits that are not allowed to change after driver load */ + if (HFI1_CAP_LOCKED() && (diff & ~write_mask)) { + pr_warn("Ignoring non-writable capability bits %#lx\n", + diff & ~write_mask); + diff &= write_mask; + } + + /* Mask off any reserved bits */ + diff &= ~HFI1_CAP_RESERVED_MASK; + /* Clear any previously set and changing bits */ + cap_mask &= ~diff; + /* Update the bits with the new capability */ + cap_mask |= (value & diff); + /* Check for any kernel/user restrictions */ + diff = (cap_mask & (HFI1_CAP_MUST_HAVE_KERN << HFI1_CAP_USER_SHIFT)) ^ + ((cap_mask & HFI1_CAP_MUST_HAVE_KERN) << HFI1_CAP_USER_SHIFT); + cap_mask &= ~diff; + /* Set the bitmask to the final set */ + *cap_mask_ptr = cap_mask; +done: + return ret; +} + +static int hfi1_caps_get(char *buffer, const struct kernel_param *kp) +{ + unsigned long cap_mask = *(unsigned long *)kp->arg; + + cap_mask &= ~HFI1_CAP_LOCKED_SMASK; + cap_mask |= ((cap_mask & HFI1_CAP_K2U) << HFI1_CAP_USER_SHIFT); + + return scnprintf(buffer, PAGE_SIZE, "0x%lx", cap_mask); +} + +struct pci_dev *get_pci_dev(struct rvt_dev_info *rdi) +{ + struct hfi1_ibdev *ibdev = container_of(rdi, struct hfi1_ibdev, rdi); + struct hfi1_devdata *dd = container_of(ibdev, + struct hfi1_devdata, verbs_dev); + return dd->pcidev; +} + +/* + * Return count of units with at least one port ACTIVE. + */ +int hfi1_count_active_units(void) +{ + struct hfi1_devdata *dd; + struct hfi1_pportdata *ppd; + unsigned long index, flags; + int pidx, nunits_active = 0; + + xa_lock_irqsave(&hfi1_dev_table, flags); + xa_for_each(&hfi1_dev_table, index, dd) { + if (!(dd->flags & HFI1_PRESENT) || !dd->kregbase1) + continue; + for (pidx = 0; pidx < dd->num_pports; ++pidx) { + ppd = dd->pport + pidx; + if (ppd->lid && ppd->linkup) { + nunits_active++; + break; + } + } + } + xa_unlock_irqrestore(&hfi1_dev_table, flags); + return nunits_active; +} + +/* + * Get address of eager buffer from it's index (allocated in chunks, not + * contiguous). + */ +static inline void *get_egrbuf(const struct hfi1_ctxtdata *rcd, u64 rhf, + u8 *update) +{ + u32 idx = rhf_egr_index(rhf), offset = rhf_egr_buf_offset(rhf); + + *update |= !(idx & (rcd->egrbufs.threshold - 1)) && !offset; + return (void *)(((u64)(rcd->egrbufs.rcvtids[idx].addr)) + + (offset * RCV_BUF_BLOCK_SIZE)); +} + +static inline void *hfi1_get_header(struct hfi1_ctxtdata *rcd, + __le32 *rhf_addr) +{ + u32 offset = rhf_hdrq_offset(rhf_to_cpu(rhf_addr)); + + return (void *)(rhf_addr - rcd->rhf_offset + offset); +} + +static inline struct ib_header *hfi1_get_msgheader(struct hfi1_ctxtdata *rcd, + __le32 *rhf_addr) +{ + return (struct ib_header *)hfi1_get_header(rcd, rhf_addr); +} + +static inline struct hfi1_16b_header + *hfi1_get_16B_header(struct hfi1_ctxtdata *rcd, + __le32 *rhf_addr) +{ + return (struct hfi1_16b_header *)hfi1_get_header(rcd, rhf_addr); +} + +/* + * Validate and encode the a given RcvArray Buffer size. + * The function will check whether the given size falls within + * allowed size ranges for the respective type and, optionally, + * return the proper encoding. + */ +int hfi1_rcvbuf_validate(u32 size, u8 type, u16 *encoded) +{ + if (unlikely(!PAGE_ALIGNED(size))) + return 0; + if (unlikely(size < MIN_EAGER_BUFFER)) + return 0; + if (size > + (type == PT_EAGER ? MAX_EAGER_BUFFER : MAX_EXPECTED_BUFFER)) + return 0; + if (encoded) + *encoded = ilog2(size / PAGE_SIZE) + 1; + return 1; +} + +static void rcv_hdrerr(struct hfi1_ctxtdata *rcd, struct hfi1_pportdata *ppd, + struct hfi1_packet *packet) +{ + struct ib_header *rhdr = packet->hdr; + u32 rte = rhf_rcv_type_err(packet->rhf); + u32 mlid_base; + struct hfi1_ibport *ibp = rcd_to_iport(rcd); + struct hfi1_devdata *dd = ppd->dd; + struct hfi1_ibdev *verbs_dev = &dd->verbs_dev; + struct rvt_dev_info *rdi = &verbs_dev->rdi; + + if ((packet->rhf & RHF_DC_ERR) && + hfi1_dbg_fault_suppress_err(verbs_dev)) + return; + + if (packet->rhf & RHF_ICRC_ERR) + return; + + if (packet->etype == RHF_RCV_TYPE_BYPASS) { + goto drop; + } else { + u8 lnh = ib_get_lnh(rhdr); + + mlid_base = be16_to_cpu(IB_MULTICAST_LID_BASE); + if (lnh == HFI1_LRH_BTH) { + packet->ohdr = &rhdr->u.oth; + } else if (lnh == HFI1_LRH_GRH) { + packet->ohdr = &rhdr->u.l.oth; + packet->grh = &rhdr->u.l.grh; + } else { + goto drop; + } + } + + if (packet->rhf & RHF_TID_ERR) { + /* For TIDERR and RC QPs preemptively schedule a NAK */ + u32 tlen = rhf_pkt_len(packet->rhf); /* in bytes */ + u32 dlid = ib_get_dlid(rhdr); + u32 qp_num; + + /* Sanity check packet */ + if (tlen < 24) + goto drop; + + /* Check for GRH */ + if (packet->grh) { + u32 vtf; + struct ib_grh *grh = packet->grh; + + if (grh->next_hdr != IB_GRH_NEXT_HDR) + goto drop; + vtf = be32_to_cpu(grh->version_tclass_flow); + if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION) + goto drop; + } + + /* Get the destination QP number. */ + qp_num = ib_bth_get_qpn(packet->ohdr); + if (dlid < mlid_base) { + struct rvt_qp *qp; + unsigned long flags; + + rcu_read_lock(); + qp = rvt_lookup_qpn(rdi, &ibp->rvp, qp_num); + if (!qp) { + rcu_read_unlock(); + goto drop; + } + + /* + * Handle only RC QPs - for other QP types drop error + * packet. + */ + spin_lock_irqsave(&qp->r_lock, flags); + + /* Check for valid receive state. */ + if (!(ib_rvt_state_ops[qp->state] & + RVT_PROCESS_RECV_OK)) { + ibp->rvp.n_pkt_drops++; + } + + switch (qp->ibqp.qp_type) { + case IB_QPT_RC: + hfi1_rc_hdrerr(rcd, packet, qp); + break; + default: + /* For now don't handle any other QP types */ + break; + } + + spin_unlock_irqrestore(&qp->r_lock, flags); + rcu_read_unlock(); + } /* Unicast QP */ + } /* Valid packet with TIDErr */ + + /* handle "RcvTypeErr" flags */ + switch (rte) { + case RHF_RTE_ERROR_OP_CODE_ERR: + { + void *ebuf = NULL; + u8 opcode; + + if (rhf_use_egr_bfr(packet->rhf)) + ebuf = packet->ebuf; + + if (!ebuf) + goto drop; /* this should never happen */ + + opcode = ib_bth_get_opcode(packet->ohdr); + if (opcode == IB_OPCODE_CNP) { + /* + * Only in pre-B0 h/w is the CNP_OPCODE handled + * via this code path. + */ + struct rvt_qp *qp = NULL; + u32 lqpn, rqpn; + u16 rlid; + u8 svc_type, sl, sc5; + + sc5 = hfi1_9B_get_sc5(rhdr, packet->rhf); + sl = ibp->sc_to_sl[sc5]; + + lqpn = ib_bth_get_qpn(packet->ohdr); + rcu_read_lock(); + qp = rvt_lookup_qpn(rdi, &ibp->rvp, lqpn); + if (!qp) { + rcu_read_unlock(); + goto drop; + } + + switch (qp->ibqp.qp_type) { + case IB_QPT_UD: + rlid = 0; + rqpn = 0; + svc_type = IB_CC_SVCTYPE_UD; + break; + case IB_QPT_UC: + rlid = ib_get_slid(rhdr); + rqpn = qp->remote_qpn; + svc_type = IB_CC_SVCTYPE_UC; + break; + default: + rcu_read_unlock(); + goto drop; + } + + process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type); + rcu_read_unlock(); + } + + packet->rhf &= ~RHF_RCV_TYPE_ERR_SMASK; + break; + } + default: + break; + } + +drop: + return; +} + +static inline void init_packet(struct hfi1_ctxtdata *rcd, + struct hfi1_packet *packet) +{ + packet->rsize = get_hdrqentsize(rcd); /* words */ + packet->maxcnt = get_hdrq_cnt(rcd) * packet->rsize; /* words */ + packet->rcd = rcd; + packet->updegr = 0; + packet->etail = -1; + packet->rhf_addr = get_rhf_addr(rcd); + packet->rhf = rhf_to_cpu(packet->rhf_addr); + packet->rhqoff = hfi1_rcd_head(rcd); + packet->numpkt = 0; +} + +/* We support only two types - 9B and 16B for now */ +static const hfi1_handle_cnp hfi1_handle_cnp_tbl[2] = { + [HFI1_PKT_TYPE_9B] = &return_cnp, + [HFI1_PKT_TYPE_16B] = &return_cnp_16B +}; + +/** + * hfi1_process_ecn_slowpath - Process FECN or BECN bits + * @qp: The packet's destination QP + * @pkt: The packet itself. + * @prescan: Is the caller the RXQ prescan + * + * Process the packet's FECN or BECN bits. By now, the packet + * has already been evaluated whether processing of those bit should + * be done. + * The significance of the @prescan argument is that if the caller + * is the RXQ prescan, a CNP will be send out instead of waiting for the + * normal packet processing to send an ACK with BECN set (or a CNP). + */ +bool hfi1_process_ecn_slowpath(struct rvt_qp *qp, struct hfi1_packet *pkt, + bool prescan) +{ + struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); + struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); + struct ib_other_headers *ohdr = pkt->ohdr; + struct ib_grh *grh = pkt->grh; + u32 rqpn = 0; + u16 pkey; + u32 rlid, slid, dlid = 0; + u8 hdr_type, sc, svc_type, opcode; + bool is_mcast = false, ignore_fecn = false, do_cnp = false, + fecn, becn; + + /* can be called from prescan */ + if (pkt->etype == RHF_RCV_TYPE_BYPASS) { + pkey = hfi1_16B_get_pkey(pkt->hdr); + sc = hfi1_16B_get_sc(pkt->hdr); + dlid = hfi1_16B_get_dlid(pkt->hdr); + slid = hfi1_16B_get_slid(pkt->hdr); + is_mcast = hfi1_is_16B_mcast(dlid); + opcode = ib_bth_get_opcode(ohdr); + hdr_type = HFI1_PKT_TYPE_16B; + fecn = hfi1_16B_get_fecn(pkt->hdr); + becn = hfi1_16B_get_becn(pkt->hdr); + } else { + pkey = ib_bth_get_pkey(ohdr); + sc = hfi1_9B_get_sc5(pkt->hdr, pkt->rhf); + dlid = qp->ibqp.qp_type != IB_QPT_UD ? ib_get_dlid(pkt->hdr) : + ppd->lid; + slid = ib_get_slid(pkt->hdr); + is_mcast = (dlid > be16_to_cpu(IB_MULTICAST_LID_BASE)) && + (dlid != be16_to_cpu(IB_LID_PERMISSIVE)); + opcode = ib_bth_get_opcode(ohdr); + hdr_type = HFI1_PKT_TYPE_9B; + fecn = ib_bth_get_fecn(ohdr); + becn = ib_bth_get_becn(ohdr); + } + + switch (qp->ibqp.qp_type) { + case IB_QPT_UD: + rlid = slid; + rqpn = ib_get_sqpn(pkt->ohdr); + svc_type = IB_CC_SVCTYPE_UD; + break; + case IB_QPT_SMI: + case IB_QPT_GSI: + rlid = slid; + rqpn = ib_get_sqpn(pkt->ohdr); + svc_type = IB_CC_SVCTYPE_UD; + break; + case IB_QPT_UC: + rlid = rdma_ah_get_dlid(&qp->remote_ah_attr); + rqpn = qp->remote_qpn; + svc_type = IB_CC_SVCTYPE_UC; + break; + case IB_QPT_RC: + rlid = rdma_ah_get_dlid(&qp->remote_ah_attr); + rqpn = qp->remote_qpn; + svc_type = IB_CC_SVCTYPE_RC; + break; + default: + return false; + } + + ignore_fecn = is_mcast || (opcode == IB_OPCODE_CNP) || + (opcode == IB_OPCODE_RC_ACKNOWLEDGE); + /* + * ACKNOWLEDGE packets do not get a CNP but this will be + * guarded by ignore_fecn above. + */ + do_cnp = prescan || + (opcode >= IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST && + opcode <= IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE) || + opcode == TID_OP(READ_RESP) || + opcode == TID_OP(ACK); + + /* Call appropriate CNP handler */ + if (!ignore_fecn && do_cnp && fecn) + hfi1_handle_cnp_tbl[hdr_type](ibp, qp, rqpn, pkey, + dlid, rlid, sc, grh); + + if (becn) { + u32 lqpn = be32_to_cpu(ohdr->bth[1]) & RVT_QPN_MASK; + u8 sl = ibp->sc_to_sl[sc]; + + process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type); + } + return !ignore_fecn && fecn; +} + +struct ps_mdata { + struct hfi1_ctxtdata *rcd; + u32 rsize; + u32 maxcnt; + u32 ps_head; + u32 ps_tail; + u32 ps_seq; +}; + +static inline void init_ps_mdata(struct ps_mdata *mdata, + struct hfi1_packet *packet) +{ + struct hfi1_ctxtdata *rcd = packet->rcd; + + mdata->rcd = rcd; + mdata->rsize = packet->rsize; + mdata->maxcnt = packet->maxcnt; + mdata->ps_head = packet->rhqoff; + + if (get_dma_rtail_setting(rcd)) { + mdata->ps_tail = get_rcvhdrtail(rcd); + if (rcd->ctxt == HFI1_CTRL_CTXT) + mdata->ps_seq = hfi1_seq_cnt(rcd); + else + mdata->ps_seq = 0; /* not used with DMA_RTAIL */ + } else { + mdata->ps_tail = 0; /* used only with DMA_RTAIL*/ + mdata->ps_seq = hfi1_seq_cnt(rcd); + } +} + +static inline int ps_done(struct ps_mdata *mdata, u64 rhf, + struct hfi1_ctxtdata *rcd) +{ + if (get_dma_rtail_setting(rcd)) + return mdata->ps_head == mdata->ps_tail; + return mdata->ps_seq != rhf_rcv_seq(rhf); +} + +static inline int ps_skip(struct ps_mdata *mdata, u64 rhf, + struct hfi1_ctxtdata *rcd) +{ + /* + * Control context can potentially receive an invalid rhf. + * Drop such packets. + */ + if ((rcd->ctxt == HFI1_CTRL_CTXT) && (mdata->ps_head != mdata->ps_tail)) + return mdata->ps_seq != rhf_rcv_seq(rhf); + + return 0; +} + +static inline void update_ps_mdata(struct ps_mdata *mdata, + struct hfi1_ctxtdata *rcd) +{ + mdata->ps_head += mdata->rsize; + if (mdata->ps_head >= mdata->maxcnt) + mdata->ps_head = 0; + + /* Control context must do seq counting */ + if (!get_dma_rtail_setting(rcd) || + rcd->ctxt == HFI1_CTRL_CTXT) + mdata->ps_seq = hfi1_seq_incr_wrap(mdata->ps_seq); +} + +/* + * prescan_rxq - search through the receive queue looking for packets + * containing Excplicit Congestion Notifications (FECNs, or BECNs). + * When an ECN is found, process the Congestion Notification, and toggle + * it off. + * This is declared as a macro to allow quick checking of the port to avoid + * the overhead of a function call if not enabled. + */ +#define prescan_rxq(rcd, packet) \ + do { \ + if (rcd->ppd->cc_prescan) \ + __prescan_rxq(packet); \ + } while (0) +static void __prescan_rxq(struct hfi1_packet *packet) +{ + struct hfi1_ctxtdata *rcd = packet->rcd; + struct ps_mdata mdata; + + init_ps_mdata(&mdata, packet); + + while (1) { + struct hfi1_ibport *ibp = rcd_to_iport(rcd); + __le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head + + packet->rcd->rhf_offset; + struct rvt_qp *qp; + struct ib_header *hdr; + struct rvt_dev_info *rdi = &rcd->dd->verbs_dev.rdi; + u64 rhf = rhf_to_cpu(rhf_addr); + u32 etype = rhf_rcv_type(rhf), qpn, bth1; + u8 lnh; + + if (ps_done(&mdata, rhf, rcd)) + break; + + if (ps_skip(&mdata, rhf, rcd)) + goto next; + + if (etype != RHF_RCV_TYPE_IB) + goto next; + + packet->hdr = hfi1_get_msgheader(packet->rcd, rhf_addr); + hdr = packet->hdr; + lnh = ib_get_lnh(hdr); + + if (lnh == HFI1_LRH_BTH) { + packet->ohdr = &hdr->u.oth; + packet->grh = NULL; + } else if (lnh == HFI1_LRH_GRH) { + packet->ohdr = &hdr->u.l.oth; + packet->grh = &hdr->u.l.grh; + } else { + goto next; /* just in case */ + } + + if (!hfi1_may_ecn(packet)) + goto next; + + bth1 = be32_to_cpu(packet->ohdr->bth[1]); + qpn = bth1 & RVT_QPN_MASK; + rcu_read_lock(); + qp = rvt_lookup_qpn(rdi, &ibp->rvp, qpn); + + if (!qp) { + rcu_read_unlock(); + goto next; + } + + hfi1_process_ecn_slowpath(qp, packet, true); + rcu_read_unlock(); + + /* turn off BECN, FECN */ + bth1 &= ~(IB_FECN_SMASK | IB_BECN_SMASK); + packet->ohdr->bth[1] = cpu_to_be32(bth1); +next: + update_ps_mdata(&mdata, rcd); + } +} + +static void process_rcv_qp_work(struct hfi1_packet *packet) +{ + struct rvt_qp *qp, *nqp; + struct hfi1_ctxtdata *rcd = packet->rcd; + + /* + * Iterate over all QPs waiting to respond. + * The list won't change since the IRQ is only run on one CPU. + */ + list_for_each_entry_safe(qp, nqp, &rcd->qp_wait_list, rspwait) { + list_del_init(&qp->rspwait); + if (qp->r_flags & RVT_R_RSP_NAK) { + qp->r_flags &= ~RVT_R_RSP_NAK; + packet->qp = qp; + hfi1_send_rc_ack(packet, 0); + } + if (qp->r_flags & RVT_R_RSP_SEND) { + unsigned long flags; + + qp->r_flags &= ~RVT_R_RSP_SEND; + spin_lock_irqsave(&qp->s_lock, flags); + if (ib_rvt_state_ops[qp->state] & + RVT_PROCESS_OR_FLUSH_SEND) + hfi1_schedule_send(qp); + spin_unlock_irqrestore(&qp->s_lock, flags); + } + rvt_put_qp(qp); + } +} + +static noinline int max_packet_exceeded(struct hfi1_packet *packet, int thread) +{ + if (thread) { + if ((packet->numpkt & (MAX_PKT_RECV_THREAD - 1)) == 0) + /* allow defered processing */ + process_rcv_qp_work(packet); + cond_resched(); + return RCV_PKT_OK; + } else { + this_cpu_inc(*packet->rcd->dd->rcv_limit); + return RCV_PKT_LIMIT; + } +} + +static inline int check_max_packet(struct hfi1_packet *packet, int thread) +{ + int ret = RCV_PKT_OK; + + if (unlikely((packet->numpkt & (MAX_PKT_RECV - 1)) == 0)) + ret = max_packet_exceeded(packet, thread); + return ret; +} + +static noinline int skip_rcv_packet(struct hfi1_packet *packet, int thread) +{ + int ret; + + packet->rcd->dd->ctx0_seq_drop++; + /* Set up for the next packet */ + packet->rhqoff += packet->rsize; + if (packet->rhqoff >= packet->maxcnt) + packet->rhqoff = 0; + + packet->numpkt++; + ret = check_max_packet(packet, thread); + + packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff + + packet->rcd->rhf_offset; + packet->rhf = rhf_to_cpu(packet->rhf_addr); + + return ret; +} + +static void process_rcv_packet_napi(struct hfi1_packet *packet) +{ + packet->etype = rhf_rcv_type(packet->rhf); + + /* total length */ + packet->tlen = rhf_pkt_len(packet->rhf); /* in bytes */ + /* retrieve eager buffer details */ + packet->etail = rhf_egr_index(packet->rhf); + packet->ebuf = get_egrbuf(packet->rcd, packet->rhf, + &packet->updegr); + /* + * Prefetch the contents of the eager buffer. It is + * OK to send a negative length to prefetch_range(). + * The +2 is the size of the RHF. + */ + prefetch_range(packet->ebuf, + packet->tlen - ((packet->rcd->rcvhdrqentsize - + (rhf_hdrq_offset(packet->rhf) + + 2)) * 4)); + + packet->rcd->rhf_rcv_function_map[packet->etype](packet); + packet->numpkt++; + + /* Set up for the next packet */ + packet->rhqoff += packet->rsize; + if (packet->rhqoff >= packet->maxcnt) + packet->rhqoff = 0; + + packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff + + packet->rcd->rhf_offset; + packet->rhf = rhf_to_cpu(packet->rhf_addr); +} + +static inline int process_rcv_packet(struct hfi1_packet *packet, int thread) +{ + int ret; + + packet->etype = rhf_rcv_type(packet->rhf); + + /* total length */ + packet->tlen = rhf_pkt_len(packet->rhf); /* in bytes */ + /* retrieve eager buffer details */ + packet->ebuf = NULL; + if (rhf_use_egr_bfr(packet->rhf)) { + packet->etail = rhf_egr_index(packet->rhf); + packet->ebuf = get_egrbuf(packet->rcd, packet->rhf, + &packet->updegr); + /* + * Prefetch the contents of the eager buffer. It is + * OK to send a negative length to prefetch_range(). + * The +2 is the size of the RHF. + */ + prefetch_range(packet->ebuf, + packet->tlen - ((get_hdrqentsize(packet->rcd) - + (rhf_hdrq_offset(packet->rhf) + + 2)) * 4)); + } + + /* + * Call a type specific handler for the packet. We + * should be able to trust that etype won't be beyond + * the range of valid indexes. If so something is really + * wrong and we can probably just let things come + * crashing down. There is no need to eat another + * comparison in this performance critical code. + */ + packet->rcd->rhf_rcv_function_map[packet->etype](packet); + packet->numpkt++; + + /* Set up for the next packet */ + packet->rhqoff += packet->rsize; + if (packet->rhqoff >= packet->maxcnt) + packet->rhqoff = 0; + + ret = check_max_packet(packet, thread); + + packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff + + packet->rcd->rhf_offset; + packet->rhf = rhf_to_cpu(packet->rhf_addr); + + return ret; +} + +static inline void process_rcv_update(int last, struct hfi1_packet *packet) +{ + /* + * Update head regs etc., every 16 packets, if not last pkt, + * to help prevent rcvhdrq overflows, when many packets + * are processed and queue is nearly full. + * Don't request an interrupt for intermediate updates. + */ + if (!last && !(packet->numpkt & 0xf)) { + update_usrhead(packet->rcd, packet->rhqoff, packet->updegr, + packet->etail, 0, 0); + packet->updegr = 0; + } + packet->grh = NULL; +} + +static inline void finish_packet(struct hfi1_packet *packet) +{ + /* + * Nothing we need to free for the packet. + * + * The only thing we need to do is a final update and call for an + * interrupt + */ + update_usrhead(packet->rcd, hfi1_rcd_head(packet->rcd), packet->updegr, + packet->etail, rcv_intr_dynamic, packet->numpkt); +} + +/* + * handle_receive_interrupt_napi_fp - receive a packet + * @rcd: the context + * @budget: polling budget + * + * Called from interrupt handler for receive interrupt. + * This is the fast path interrupt handler + * when executing napi soft irq environment. + */ +int handle_receive_interrupt_napi_fp(struct hfi1_ctxtdata *rcd, int budget) +{ + struct hfi1_packet packet; + + init_packet(rcd, &packet); + if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf))) + goto bail; + + while (packet.numpkt < budget) { + process_rcv_packet_napi(&packet); + if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf))) + break; + + process_rcv_update(0, &packet); + } + hfi1_set_rcd_head(rcd, packet.rhqoff); +bail: + finish_packet(&packet); + return packet.numpkt; +} + +/* + * Handle receive interrupts when using the no dma rtail option. + */ +int handle_receive_interrupt_nodma_rtail(struct hfi1_ctxtdata *rcd, int thread) +{ + int last = RCV_PKT_OK; + struct hfi1_packet packet; + + init_packet(rcd, &packet); + if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf))) { + last = RCV_PKT_DONE; + goto bail; + } + + prescan_rxq(rcd, &packet); + + while (last == RCV_PKT_OK) { + last = process_rcv_packet(&packet, thread); + if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf))) + last = RCV_PKT_DONE; + process_rcv_update(last, &packet); + } + process_rcv_qp_work(&packet); + hfi1_set_rcd_head(rcd, packet.rhqoff); +bail: + finish_packet(&packet); + return last; +} + +int handle_receive_interrupt_dma_rtail(struct hfi1_ctxtdata *rcd, int thread) +{ + u32 hdrqtail; + int last = RCV_PKT_OK; + struct hfi1_packet packet; + + init_packet(rcd, &packet); + hdrqtail = get_rcvhdrtail(rcd); + if (packet.rhqoff == hdrqtail) { + last = RCV_PKT_DONE; + goto bail; + } + smp_rmb(); /* prevent speculative reads of dma'ed hdrq */ + + prescan_rxq(rcd, &packet); + + while (last == RCV_PKT_OK) { + last = process_rcv_packet(&packet, thread); + if (packet.rhqoff == hdrqtail) + last = RCV_PKT_DONE; + process_rcv_update(last, &packet); + } + process_rcv_qp_work(&packet); + hfi1_set_rcd_head(rcd, packet.rhqoff); +bail: + finish_packet(&packet); + return last; +} + +static void set_all_fastpath(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd) +{ + u16 i; + + /* + * For dynamically allocated kernel contexts (like vnic) switch + * interrupt handler only for that context. Otherwise, switch + * interrupt handler for all statically allocated kernel contexts. + */ + if (rcd->ctxt >= dd->first_dyn_alloc_ctxt && !rcd->is_vnic) { + hfi1_rcd_get(rcd); + hfi1_set_fast(rcd); + hfi1_rcd_put(rcd); + return; + } + + for (i = HFI1_CTRL_CTXT + 1; i < dd->num_rcv_contexts; i++) { + rcd = hfi1_rcd_get_by_index(dd, i); + if (rcd && (i < dd->first_dyn_alloc_ctxt || rcd->is_vnic)) + hfi1_set_fast(rcd); + hfi1_rcd_put(rcd); + } +} + +void set_all_slowpath(struct hfi1_devdata *dd) +{ + struct hfi1_ctxtdata *rcd; + u16 i; + + /* HFI1_CTRL_CTXT must always use the slow path interrupt handler */ + for (i = HFI1_CTRL_CTXT + 1; i < dd->num_rcv_contexts; i++) { + rcd = hfi1_rcd_get_by_index(dd, i); + if (!rcd) + continue; + if (i < dd->first_dyn_alloc_ctxt || rcd->is_vnic) + rcd->do_interrupt = rcd->slow_handler; + + hfi1_rcd_put(rcd); + } +} + +static bool __set_armed_to_active(struct hfi1_packet *packet) +{ + u8 etype = rhf_rcv_type(packet->rhf); + u8 sc = SC15_PACKET; + + if (etype == RHF_RCV_TYPE_IB) { + struct ib_header *hdr = hfi1_get_msgheader(packet->rcd, + packet->rhf_addr); + sc = hfi1_9B_get_sc5(hdr, packet->rhf); + } else if (etype == RHF_RCV_TYPE_BYPASS) { + struct hfi1_16b_header *hdr = hfi1_get_16B_header( + packet->rcd, + packet->rhf_addr); + sc = hfi1_16B_get_sc(hdr); + } + if (sc != SC15_PACKET) { + int hwstate = driver_lstate(packet->rcd->ppd); + struct work_struct *lsaw = + &packet->rcd->ppd->linkstate_active_work; + + if (hwstate != IB_PORT_ACTIVE) { + dd_dev_info(packet->rcd->dd, + "Unexpected link state %s\n", + opa_lstate_name(hwstate)); + return false; + } + + queue_work(packet->rcd->ppd->link_wq, lsaw); + return true; + } + return false; +} + +/** + * set_armed_to_active - the fast path for armed to active + * @packet: the packet structure + * + * Return true if packet processing needs to bail. + */ +static bool set_armed_to_active(struct hfi1_packet *packet) +{ + if (likely(packet->rcd->ppd->host_link_state != HLS_UP_ARMED)) + return false; + return __set_armed_to_active(packet); +} + +/* + * handle_receive_interrupt - receive a packet + * @rcd: the context + * + * Called from interrupt handler for errors or receive interrupt. + * This is the slow path interrupt handler. + */ +int handle_receive_interrupt(struct hfi1_ctxtdata *rcd, int thread) +{ + struct hfi1_devdata *dd = rcd->dd; + u32 hdrqtail; + int needset, last = RCV_PKT_OK; + struct hfi1_packet packet; + int skip_pkt = 0; + + if (!rcd->rcvhdrq) + return RCV_PKT_OK; + /* Control context will always use the slow path interrupt handler */ + needset = (rcd->ctxt == HFI1_CTRL_CTXT) ? 0 : 1; + + init_packet(rcd, &packet); + + if (!get_dma_rtail_setting(rcd)) { + if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf))) { + last = RCV_PKT_DONE; + goto bail; + } + hdrqtail = 0; + } else { + hdrqtail = get_rcvhdrtail(rcd); + if (packet.rhqoff == hdrqtail) { + last = RCV_PKT_DONE; + goto bail; + } + smp_rmb(); /* prevent speculative reads of dma'ed hdrq */ + + /* + * Control context can potentially receive an invalid + * rhf. Drop such packets. + */ + if (rcd->ctxt == HFI1_CTRL_CTXT) + if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf))) + skip_pkt = 1; + } + + prescan_rxq(rcd, &packet); + + while (last == RCV_PKT_OK) { + if (hfi1_need_drop(dd)) { + /* On to the next packet */ + packet.rhqoff += packet.rsize; + packet.rhf_addr = (__le32 *)rcd->rcvhdrq + + packet.rhqoff + + rcd->rhf_offset; + packet.rhf = rhf_to_cpu(packet.rhf_addr); + + } else if (skip_pkt) { + last = skip_rcv_packet(&packet, thread); + skip_pkt = 0; + } else { + if (set_armed_to_active(&packet)) + goto bail; + last = process_rcv_packet(&packet, thread); + } + + if (!get_dma_rtail_setting(rcd)) { + if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf))) + last = RCV_PKT_DONE; + } else { + if (packet.rhqoff == hdrqtail) + last = RCV_PKT_DONE; + /* + * Control context can potentially receive an invalid + * rhf. Drop such packets. + */ + if (rcd->ctxt == HFI1_CTRL_CTXT) { + bool lseq; + + lseq = hfi1_seq_incr(rcd, + rhf_rcv_seq(packet.rhf)); + if (!last && lseq) + skip_pkt = 1; + } + } + + if (needset) { + needset = false; + set_all_fastpath(dd, rcd); + } + process_rcv_update(last, &packet); + } + + process_rcv_qp_work(&packet); + hfi1_set_rcd_head(rcd, packet.rhqoff); + +bail: + /* + * Always write head at end, and setup rcv interrupt, even + * if no packets were processed. + */ + finish_packet(&packet); + return last; +} + +/* + * handle_receive_interrupt_napi_sp - receive a packet + * @rcd: the context + * @budget: polling budget + * + * Called from interrupt handler for errors or receive interrupt. + * This is the slow path interrupt handler + * when executing napi soft irq environment. + */ +int handle_receive_interrupt_napi_sp(struct hfi1_ctxtdata *rcd, int budget) +{ + struct hfi1_devdata *dd = rcd->dd; + int last = RCV_PKT_OK; + bool needset = true; + struct hfi1_packet packet; + + init_packet(rcd, &packet); + if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf))) + goto bail; + + while (last != RCV_PKT_DONE && packet.numpkt < budget) { + if (hfi1_need_drop(dd)) { + /* On to the next packet */ + packet.rhqoff += packet.rsize; + packet.rhf_addr = (__le32 *)rcd->rcvhdrq + + packet.rhqoff + + rcd->rhf_offset; + packet.rhf = rhf_to_cpu(packet.rhf_addr); + + } else { + if (set_armed_to_active(&packet)) + goto bail; + process_rcv_packet_napi(&packet); + } + + if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf))) + last = RCV_PKT_DONE; + + if (needset) { + needset = false; + set_all_fastpath(dd, rcd); + } + + process_rcv_update(last, &packet); + } + + hfi1_set_rcd_head(rcd, packet.rhqoff); + +bail: + /* + * Always write head at end, and setup rcv interrupt, even + * if no packets were processed. + */ + finish_packet(&packet); + return packet.numpkt; +} + +/* + * We may discover in the interrupt that the hardware link state has + * changed from ARMED to ACTIVE (due to the arrival of a non-SC15 packet), + * and we need to update the driver's notion of the link state. We cannot + * run set_link_state from interrupt context, so we queue this function on + * a workqueue. + * + * We delay the regular interrupt processing until after the state changes + * so that the link will be in the correct state by the time any application + * we wake up attempts to send a reply to any message it received. + * (Subsequent receive interrupts may possibly force the wakeup before we + * update the link state.) + * + * The rcd is freed in hfi1_free_ctxtdata after hfi1_postinit_cleanup invokes + * dd->f_cleanup(dd) to disable the interrupt handler and flush workqueues, + * so we're safe from use-after-free of the rcd. + */ +void receive_interrupt_work(struct work_struct *work) +{ + struct hfi1_pportdata *ppd = container_of(work, struct hfi1_pportdata, + linkstate_active_work); + struct hfi1_devdata *dd = ppd->dd; + struct hfi1_ctxtdata *rcd; + u16 i; + + /* Received non-SC15 packet implies neighbor_normal */ + ppd->neighbor_normal = 1; + set_link_state(ppd, HLS_UP_ACTIVE); + + /* + * Interrupt all statically allocated kernel contexts that could + * have had an interrupt during auto activation. + */ + for (i = HFI1_CTRL_CTXT; i < dd->first_dyn_alloc_ctxt; i++) { + rcd = hfi1_rcd_get_by_index(dd, i); + if (rcd) + force_recv_intr(rcd); + hfi1_rcd_put(rcd); + } +} + +/* + * Convert a given MTU size to the on-wire MAD packet enumeration. + * Return -1 if the size is invalid. + */ +int mtu_to_enum(u32 mtu, int default_if_bad) +{ + switch (mtu) { + case 0: return OPA_MTU_0; + case 256: return OPA_MTU_256; + case 512: return OPA_MTU_512; + case 1024: return OPA_MTU_1024; + case 2048: return OPA_MTU_2048; + case 4096: return OPA_MTU_4096; + case 8192: return OPA_MTU_8192; + case 10240: return OPA_MTU_10240; + } + return default_if_bad; +} + +u16 enum_to_mtu(int mtu) +{ + switch (mtu) { + case OPA_MTU_0: return 0; + case OPA_MTU_256: return 256; + case OPA_MTU_512: return 512; + case OPA_MTU_1024: return 1024; + case OPA_MTU_2048: return 2048; + case OPA_MTU_4096: return 4096; + case OPA_MTU_8192: return 8192; + case OPA_MTU_10240: return 10240; + default: return 0xffff; + } +} + +/* + * set_mtu - set the MTU + * @ppd: the per port data + * + * We can handle "any" incoming size, the issue here is whether we + * need to restrict our outgoing size. We do not deal with what happens + * to programs that are already running when the size changes. + */ +int set_mtu(struct hfi1_pportdata *ppd) +{ + struct hfi1_devdata *dd = ppd->dd; + int i, drain, ret = 0, is_up = 0; + + ppd->ibmtu = 0; + for (i = 0; i < ppd->vls_supported; i++) + if (ppd->ibmtu < dd->vld[i].mtu) + ppd->ibmtu = dd->vld[i].mtu; + ppd->ibmaxlen = ppd->ibmtu + lrh_max_header_bytes(ppd->dd); + + mutex_lock(&ppd->hls_lock); + if (ppd->host_link_state == HLS_UP_INIT || + ppd->host_link_state == HLS_UP_ARMED || + ppd->host_link_state == HLS_UP_ACTIVE) + is_up = 1; + + drain = !is_ax(dd) && is_up; + + if (drain) + /* + * MTU is specified per-VL. To ensure that no packet gets + * stuck (due, e.g., to the MTU for the packet's VL being + * reduced), empty the per-VL FIFOs before adjusting MTU. + */ + ret = stop_drain_data_vls(dd); + + if (ret) { + dd_dev_err(dd, "%s: cannot stop/drain VLs - refusing to change per-VL MTUs\n", + __func__); + goto err; + } + + hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_MTU, 0); + + if (drain) + open_fill_data_vls(dd); /* reopen all VLs */ + +err: + mutex_unlock(&ppd->hls_lock); + + return ret; +} + +int hfi1_set_lid(struct hfi1_pportdata *ppd, u32 lid, u8 lmc) +{ + struct hfi1_devdata *dd = ppd->dd; + + ppd->lid = lid; + ppd->lmc = lmc; + hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_LIDLMC, 0); + + dd_dev_info(dd, "port %u: got a lid: 0x%x\n", ppd->port, lid); + + return 0; +} + +void shutdown_led_override(struct hfi1_pportdata *ppd) +{ + struct hfi1_devdata *dd = ppd->dd; + + /* + * This pairs with the memory barrier in hfi1_start_led_override to + * ensure that we read the correct state of LED beaconing represented + * by led_override_timer_active + */ + smp_rmb(); + if (atomic_read(&ppd->led_override_timer_active)) { + del_timer_sync(&ppd->led_override_timer); + atomic_set(&ppd->led_override_timer_active, 0); + /* Ensure the atomic_set is visible to all CPUs */ + smp_wmb(); + } + + /* Hand control of the LED to the DC for normal operation */ + write_csr(dd, DCC_CFG_LED_CNTRL, 0); +} + +static void run_led_override(struct timer_list *t) +{ + struct hfi1_pportdata *ppd = from_timer(ppd, t, led_override_timer); + struct hfi1_devdata *dd = ppd->dd; + unsigned long timeout; + int phase_idx; + + if (!(dd->flags & HFI1_INITTED)) + return; + + phase_idx = ppd->led_override_phase & 1; + + setextled(dd, phase_idx); + + timeout = ppd->led_override_vals[phase_idx]; + + /* Set up for next phase */ + ppd->led_override_phase = !ppd->led_override_phase; + + mod_timer(&ppd->led_override_timer, jiffies + timeout); +} + +/* + * To have the LED blink in a particular pattern, provide timeon and timeoff + * in milliseconds. + * To turn off custom blinking and return to normal operation, use + * shutdown_led_override() + */ +void hfi1_start_led_override(struct hfi1_pportdata *ppd, unsigned int timeon, + unsigned int timeoff) +{ + if (!(ppd->dd->flags & HFI1_INITTED)) + return; + + /* Convert to jiffies for direct use in timer */ + ppd->led_override_vals[0] = msecs_to_jiffies(timeoff); + ppd->led_override_vals[1] = msecs_to_jiffies(timeon); + + /* Arbitrarily start from LED on phase */ + ppd->led_override_phase = 1; + + /* + * If the timer has not already been started, do so. Use a "quick" + * timeout so the handler will be called soon to look at our request. + */ + if (!timer_pending(&ppd->led_override_timer)) { + timer_setup(&ppd->led_override_timer, run_led_override, 0); + ppd->led_override_timer.expires = jiffies + 1; + add_timer(&ppd->led_override_timer); + atomic_set(&ppd->led_override_timer_active, 1); + /* Ensure the atomic_set is visible to all CPUs */ + smp_wmb(); + } +} + +/** + * hfi1_reset_device - reset the chip if possible + * @unit: the device to reset + * + * Whether or not reset is successful, we attempt to re-initialize the chip + * (that is, much like a driver unload/reload). We clear the INITTED flag + * so that the various entry points will fail until we reinitialize. For + * now, we only allow this if no user contexts are open that use chip resources + */ +int hfi1_reset_device(int unit) +{ + int ret; + struct hfi1_devdata *dd = hfi1_lookup(unit); + struct hfi1_pportdata *ppd; + int pidx; + + if (!dd) { + ret = -ENODEV; + goto bail; + } + + dd_dev_info(dd, "Reset on unit %u requested\n", unit); + + if (!dd->kregbase1 || !(dd->flags & HFI1_PRESENT)) { + dd_dev_info(dd, + "Invalid unit number %u or not initialized or not present\n", + unit); + ret = -ENXIO; + goto bail; + } + + /* If there are any user/vnic contexts, we cannot reset */ + mutex_lock(&hfi1_mutex); + if (dd->rcd) + if (hfi1_stats.sps_ctxts) { + mutex_unlock(&hfi1_mutex); + ret = -EBUSY; + goto bail; + } + mutex_unlock(&hfi1_mutex); + + for (pidx = 0; pidx < dd->num_pports; ++pidx) { + ppd = dd->pport + pidx; + + shutdown_led_override(ppd); + } + if (dd->flags & HFI1_HAS_SEND_DMA) + sdma_exit(dd); + + hfi1_reset_cpu_counters(dd); + + ret = hfi1_init(dd, 1); + + if (ret) + dd_dev_err(dd, + "Reinitialize unit %u after reset failed with %d\n", + unit, ret); + else + dd_dev_info(dd, "Reinitialized unit %u after resetting\n", + unit); + +bail: + return ret; +} + +static inline void hfi1_setup_ib_header(struct hfi1_packet *packet) +{ + packet->hdr = (struct hfi1_ib_message_header *) + hfi1_get_msgheader(packet->rcd, + packet->rhf_addr); + packet->hlen = (u8 *)packet->rhf_addr - (u8 *)packet->hdr; +} + +static int hfi1_bypass_ingress_pkt_check(struct hfi1_packet *packet) +{ + struct hfi1_pportdata *ppd = packet->rcd->ppd; + + /* slid and dlid cannot be 0 */ + if ((!packet->slid) || (!packet->dlid)) + return -EINVAL; + + /* Compare port lid with incoming packet dlid */ + if ((!(hfi1_is_16B_mcast(packet->dlid))) && + (packet->dlid != + opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE), 16B))) { + if ((packet->dlid & ~((1 << ppd->lmc) - 1)) != ppd->lid) + return -EINVAL; + } + + /* No multicast packets with SC15 */ + if ((hfi1_is_16B_mcast(packet->dlid)) && (packet->sc == 0xF)) + return -EINVAL; + + /* Packets with permissive DLID always on SC15 */ + if ((packet->dlid == opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE), + 16B)) && + (packet->sc != 0xF)) + return -EINVAL; + + return 0; +} + +static int hfi1_setup_9B_packet(struct hfi1_packet *packet) +{ + struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd); + struct ib_header *hdr; + u8 lnh; + + hfi1_setup_ib_header(packet); + hdr = packet->hdr; + + lnh = ib_get_lnh(hdr); + if (lnh == HFI1_LRH_BTH) { + packet->ohdr = &hdr->u.oth; + packet->grh = NULL; + } else if (lnh == HFI1_LRH_GRH) { + u32 vtf; + + packet->ohdr = &hdr->u.l.oth; + packet->grh = &hdr->u.l.grh; + if (packet->grh->next_hdr != IB_GRH_NEXT_HDR) + goto drop; + vtf = be32_to_cpu(packet->grh->version_tclass_flow); + if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION) + goto drop; + } else { + goto drop; + } + + /* Query commonly used fields from packet header */ + packet->payload = packet->ebuf; + packet->opcode = ib_bth_get_opcode(packet->ohdr); + packet->slid = ib_get_slid(hdr); + packet->dlid = ib_get_dlid(hdr); + if (unlikely((packet->dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE)) && + (packet->dlid != be16_to_cpu(IB_LID_PERMISSIVE)))) + packet->dlid += opa_get_mcast_base(OPA_MCAST_NR) - + be16_to_cpu(IB_MULTICAST_LID_BASE); + packet->sl = ib_get_sl(hdr); + packet->sc = hfi1_9B_get_sc5(hdr, packet->rhf); + packet->pad = ib_bth_get_pad(packet->ohdr); + packet->extra_byte = 0; + packet->pkey = ib_bth_get_pkey(packet->ohdr); + packet->migrated = ib_bth_is_migration(packet->ohdr); + + return 0; +drop: + ibp->rvp.n_pkt_drops++; + return -EINVAL; +} + +static int hfi1_setup_bypass_packet(struct hfi1_packet *packet) +{ + /* + * Bypass packets have a different header/payload split + * compared to an IB packet. + * Current split is set such that 16 bytes of the actual + * header is in the header buffer and the remining is in + * the eager buffer. We chose 16 since hfi1 driver only + * supports 16B bypass packets and we will be able to + * receive the entire LRH with such a split. + */ + + struct hfi1_ctxtdata *rcd = packet->rcd; + struct hfi1_pportdata *ppd = rcd->ppd; + struct hfi1_ibport *ibp = &ppd->ibport_data; + u8 l4; + + packet->hdr = (struct hfi1_16b_header *) + hfi1_get_16B_header(packet->rcd, + packet->rhf_addr); + l4 = hfi1_16B_get_l4(packet->hdr); + if (l4 == OPA_16B_L4_IB_LOCAL) { + packet->ohdr = packet->ebuf; + packet->grh = NULL; + packet->opcode = ib_bth_get_opcode(packet->ohdr); + packet->pad = hfi1_16B_bth_get_pad(packet->ohdr); + /* hdr_len_by_opcode already has an IB LRH factored in */ + packet->hlen = hdr_len_by_opcode[packet->opcode] + + (LRH_16B_BYTES - LRH_9B_BYTES); + packet->migrated = opa_bth_is_migration(packet->ohdr); + } else if (l4 == OPA_16B_L4_IB_GLOBAL) { + u32 vtf; + u8 grh_len = sizeof(struct ib_grh); + + packet->ohdr = packet->ebuf + grh_len; + packet->grh = packet->ebuf; + packet->opcode = ib_bth_get_opcode(packet->ohdr); + packet->pad = hfi1_16B_bth_get_pad(packet->ohdr); + /* hdr_len_by_opcode already has an IB LRH factored in */ + packet->hlen = hdr_len_by_opcode[packet->opcode] + + (LRH_16B_BYTES - LRH_9B_BYTES) + grh_len; + packet->migrated = opa_bth_is_migration(packet->ohdr); + + if (packet->grh->next_hdr != IB_GRH_NEXT_HDR) + goto drop; + vtf = be32_to_cpu(packet->grh->version_tclass_flow); + if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION) + goto drop; + } else if (l4 == OPA_16B_L4_FM) { + packet->mgmt = packet->ebuf; + packet->ohdr = NULL; + packet->grh = NULL; + packet->opcode = IB_OPCODE_UD_SEND_ONLY; + packet->pad = OPA_16B_L4_FM_PAD; + packet->hlen = OPA_16B_L4_FM_HLEN; + packet->migrated = false; + } else { + goto drop; + } + + /* Query commonly used fields from packet header */ + packet->payload = packet->ebuf + packet->hlen - LRH_16B_BYTES; + packet->slid = hfi1_16B_get_slid(packet->hdr); + packet->dlid = hfi1_16B_get_dlid(packet->hdr); + if (unlikely(hfi1_is_16B_mcast(packet->dlid))) + packet->dlid += opa_get_mcast_base(OPA_MCAST_NR) - + opa_get_lid(opa_get_mcast_base(OPA_MCAST_NR), + 16B); + packet->sc = hfi1_16B_get_sc(packet->hdr); + packet->sl = ibp->sc_to_sl[packet->sc]; + packet->extra_byte = SIZE_OF_LT; + packet->pkey = hfi1_16B_get_pkey(packet->hdr); + + if (hfi1_bypass_ingress_pkt_check(packet)) + goto drop; + + return 0; +drop: + hfi1_cdbg(PKT, "%s: packet dropped\n", __func__); + ibp->rvp.n_pkt_drops++; + return -EINVAL; +} + +static void show_eflags_errs(struct hfi1_packet *packet) +{ + struct hfi1_ctxtdata *rcd = packet->rcd; + u32 rte = rhf_rcv_type_err(packet->rhf); + + dd_dev_err(rcd->dd, + "receive context %d: rhf 0x%016llx, errs [ %s%s%s%s%s%s%s] rte 0x%x\n", + rcd->ctxt, packet->rhf, + packet->rhf & RHF_K_HDR_LEN_ERR ? "k_hdr_len " : "", + packet->rhf & RHF_DC_UNC_ERR ? "dc_unc " : "", + packet->rhf & RHF_DC_ERR ? "dc " : "", + packet->rhf & RHF_TID_ERR ? "tid " : "", + packet->rhf & RHF_LEN_ERR ? "len " : "", + packet->rhf & RHF_ECC_ERR ? "ecc " : "", + packet->rhf & RHF_ICRC_ERR ? "icrc " : "", + rte); +} + +void handle_eflags(struct hfi1_packet *packet) +{ + struct hfi1_ctxtdata *rcd = packet->rcd; + + rcv_hdrerr(rcd, rcd->ppd, packet); + if (rhf_err_flags(packet->rhf)) + show_eflags_errs(packet); +} + +static void hfi1_ipoib_ib_rcv(struct hfi1_packet *packet) +{ + struct hfi1_ibport *ibp; + struct net_device *netdev; + struct hfi1_ctxtdata *rcd = packet->rcd; + struct napi_struct *napi = rcd->napi; + struct sk_buff *skb; + struct hfi1_netdev_rxq *rxq = container_of(napi, + struct hfi1_netdev_rxq, napi); + u32 extra_bytes; + u32 tlen, qpnum; + bool do_work, do_cnp; + + trace_hfi1_rcvhdr(packet); + + hfi1_setup_ib_header(packet); + + packet->ohdr = &((struct ib_header *)packet->hdr)->u.oth; + packet->grh = NULL; + + if (unlikely(rhf_err_flags(packet->rhf))) { + handle_eflags(packet); + return; + } + + qpnum = ib_bth_get_qpn(packet->ohdr); + netdev = hfi1_netdev_get_data(rcd->dd, qpnum); + if (!netdev) + goto drop_no_nd; + + trace_input_ibhdr(rcd->dd, packet, !!(rhf_dc_info(packet->rhf))); + trace_ctxt_rsm_hist(rcd->ctxt); + + /* handle congestion notifications */ + do_work = hfi1_may_ecn(packet); + if (unlikely(do_work)) { + do_cnp = (packet->opcode != IB_OPCODE_CNP); + (void)hfi1_process_ecn_slowpath(hfi1_ipoib_priv(netdev)->qp, + packet, do_cnp); + } + + /* + * We have split point after last byte of DETH + * lets strip padding and CRC and ICRC. + * tlen is whole packet len so we need to + * subtract header size as well. + */ + tlen = packet->tlen; + extra_bytes = ib_bth_get_pad(packet->ohdr) + (SIZE_OF_CRC << 2) + + packet->hlen; + if (unlikely(tlen < extra_bytes)) + goto drop; + + tlen -= extra_bytes; + + skb = hfi1_ipoib_prepare_skb(rxq, tlen, packet->ebuf); + if (unlikely(!skb)) + goto drop; + + dev_sw_netstats_rx_add(netdev, skb->len); + + skb->dev = netdev; + skb->pkt_type = PACKET_HOST; + netif_receive_skb(skb); + + return; + +drop: + ++netdev->stats.rx_dropped; +drop_no_nd: + ibp = rcd_to_iport(packet->rcd); + ++ibp->rvp.n_pkt_drops; +} + +/* + * The following functions are called by the interrupt handler. They are type + * specific handlers for each packet type. + */ +static void process_receive_ib(struct hfi1_packet *packet) +{ + if (hfi1_setup_9B_packet(packet)) + return; + + if (unlikely(hfi1_dbg_should_fault_rx(packet))) + return; + + trace_hfi1_rcvhdr(packet); + + if (unlikely(rhf_err_flags(packet->rhf))) { + handle_eflags(packet); + return; + } + + hfi1_ib_rcv(packet); +} + +static void process_receive_bypass(struct hfi1_packet *packet) +{ + struct hfi1_devdata *dd = packet->rcd->dd; + + if (hfi1_setup_bypass_packet(packet)) + return; + + trace_hfi1_rcvhdr(packet); + + if (unlikely(rhf_err_flags(packet->rhf))) { + handle_eflags(packet); + return; + } + + if (hfi1_16B_get_l2(packet->hdr) == 0x2) { + hfi1_16B_rcv(packet); + } else { + dd_dev_err(dd, + "Bypass packets other than 16B are not supported in normal operation. Dropping\n"); + incr_cntr64(&dd->sw_rcv_bypass_packet_errors); + if (!(dd->err_info_rcvport.status_and_code & + OPA_EI_STATUS_SMASK)) { + u64 *flits = packet->ebuf; + + if (flits && !(packet->rhf & RHF_LEN_ERR)) { + dd->err_info_rcvport.packet_flit1 = flits[0]; + dd->err_info_rcvport.packet_flit2 = + packet->tlen > sizeof(flits[0]) ? + flits[1] : 0; + } + dd->err_info_rcvport.status_and_code |= + (OPA_EI_STATUS_SMASK | BAD_L2_ERR); + } + } +} + +static void process_receive_error(struct hfi1_packet *packet) +{ + /* KHdrHCRCErr -- KDETH packet with a bad HCRC */ + if (unlikely( + hfi1_dbg_fault_suppress_err(&packet->rcd->dd->verbs_dev) && + (rhf_rcv_type_err(packet->rhf) == RHF_RCV_TYPE_ERROR || + packet->rhf & RHF_DC_ERR))) + return; + + hfi1_setup_ib_header(packet); + handle_eflags(packet); + + if (unlikely(rhf_err_flags(packet->rhf))) + dd_dev_err(packet->rcd->dd, + "Unhandled error packet received. Dropping.\n"); +} + +static void kdeth_process_expected(struct hfi1_packet *packet) +{ + hfi1_setup_9B_packet(packet); + if (unlikely(hfi1_dbg_should_fault_rx(packet))) + return; + + if (unlikely(rhf_err_flags(packet->rhf))) { + struct hfi1_ctxtdata *rcd = packet->rcd; + + if (hfi1_handle_kdeth_eflags(rcd, rcd->ppd, packet)) + return; + } + + hfi1_kdeth_expected_rcv(packet); +} + +static void kdeth_process_eager(struct hfi1_packet *packet) +{ + hfi1_setup_9B_packet(packet); + if (unlikely(hfi1_dbg_should_fault_rx(packet))) + return; + + trace_hfi1_rcvhdr(packet); + if (unlikely(rhf_err_flags(packet->rhf))) { + struct hfi1_ctxtdata *rcd = packet->rcd; + + show_eflags_errs(packet); + if (hfi1_handle_kdeth_eflags(rcd, rcd->ppd, packet)) + return; + } + + hfi1_kdeth_eager_rcv(packet); +} + +static void process_receive_invalid(struct hfi1_packet *packet) +{ + dd_dev_err(packet->rcd->dd, "Invalid packet type %d. Dropping\n", + rhf_rcv_type(packet->rhf)); +} + +#define HFI1_RCVHDR_DUMP_MAX 5 + +void seqfile_dump_rcd(struct seq_file *s, struct hfi1_ctxtdata *rcd) +{ + struct hfi1_packet packet; + struct ps_mdata mdata; + int i; + + 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", + rcd->ctxt, get_hdrq_cnt(rcd), get_hdrqentsize(rcd), + get_dma_rtail_setting(rcd) ? + "dma_rtail" : "nodma_rtail", + read_kctxt_csr(rcd->dd, rcd->ctxt, RCV_CTXT_CTRL), + read_kctxt_csr(rcd->dd, rcd->ctxt, RCV_CTXT_STATUS), + read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_HEAD) & + RCV_HDR_HEAD_HEAD_MASK, + read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_TAIL), + rcd->head); + + init_packet(rcd, &packet); + init_ps_mdata(&mdata, &packet); + + for (i = 0; i < HFI1_RCVHDR_DUMP_MAX; i++) { + __le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head + + rcd->rhf_offset; + struct ib_header *hdr; + u64 rhf = rhf_to_cpu(rhf_addr); + u32 etype = rhf_rcv_type(rhf), qpn; + u8 opcode; + u32 psn; + u8 lnh; + + if (ps_done(&mdata, rhf, rcd)) + break; + + if (ps_skip(&mdata, rhf, rcd)) + goto next; + + if (etype > RHF_RCV_TYPE_IB) + goto next; + + packet.hdr = hfi1_get_msgheader(rcd, rhf_addr); + hdr = packet.hdr; + + lnh = be16_to_cpu(hdr->lrh[0]) & 3; + + if (lnh == HFI1_LRH_BTH) + packet.ohdr = &hdr->u.oth; + else if (lnh == HFI1_LRH_GRH) + packet.ohdr = &hdr->u.l.oth; + else + goto next; /* just in case */ + + opcode = (be32_to_cpu(packet.ohdr->bth[0]) >> 24); + qpn = be32_to_cpu(packet.ohdr->bth[1]) & RVT_QPN_MASK; + psn = mask_psn(be32_to_cpu(packet.ohdr->bth[2])); + + seq_printf(s, "\tEnt %u: opcode 0x%x, qpn 0x%x, psn 0x%x\n", + mdata.ps_head, opcode, qpn, psn); +next: + update_ps_mdata(&mdata, rcd); + } +} + +const rhf_rcv_function_ptr normal_rhf_rcv_functions[] = { + [RHF_RCV_TYPE_EXPECTED] = kdeth_process_expected, + [RHF_RCV_TYPE_EAGER] = kdeth_process_eager, + [RHF_RCV_TYPE_IB] = process_receive_ib, + [RHF_RCV_TYPE_ERROR] = process_receive_error, + [RHF_RCV_TYPE_BYPASS] = process_receive_bypass, + [RHF_RCV_TYPE_INVALID5] = process_receive_invalid, + [RHF_RCV_TYPE_INVALID6] = process_receive_invalid, + [RHF_RCV_TYPE_INVALID7] = process_receive_invalid, +}; + +const rhf_rcv_function_ptr netdev_rhf_rcv_functions[] = { + [RHF_RCV_TYPE_EXPECTED] = process_receive_invalid, + [RHF_RCV_TYPE_EAGER] = process_receive_invalid, + [RHF_RCV_TYPE_IB] = hfi1_ipoib_ib_rcv, + [RHF_RCV_TYPE_ERROR] = process_receive_error, + [RHF_RCV_TYPE_BYPASS] = hfi1_vnic_bypass_rcv, + [RHF_RCV_TYPE_INVALID5] = process_receive_invalid, + [RHF_RCV_TYPE_INVALID6] = process_receive_invalid, + [RHF_RCV_TYPE_INVALID7] = process_receive_invalid, +}; |