diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/infiniband/hw/hfi1/ruc.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/infiniband/hw/hfi1/ruc.c')
-rw-r--r-- | drivers/infiniband/hw/hfi1/ruc.c | 575 |
1 files changed, 575 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/hfi1/ruc.c b/drivers/infiniband/hw/hfi1/ruc.c new file mode 100644 index 000000000..b0151b729 --- /dev/null +++ b/drivers/infiniband/hw/hfi1/ruc.c @@ -0,0 +1,575 @@ +// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause +/* + * Copyright(c) 2015 - 2018 Intel Corporation. + */ + +#include <linux/spinlock.h> + +#include "hfi.h" +#include "mad.h" +#include "qp.h" +#include "verbs_txreq.h" +#include "trace.h" + +static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id) +{ + return (gid->global.interface_id == id && + (gid->global.subnet_prefix == gid_prefix || + gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX)); +} + +/* + * + * This should be called with the QP r_lock held. + * + * The s_lock will be acquired around the hfi1_migrate_qp() call. + */ +int hfi1_ruc_check_hdr(struct hfi1_ibport *ibp, struct hfi1_packet *packet) +{ + __be64 guid; + unsigned long flags; + struct rvt_qp *qp = packet->qp; + u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(&qp->remote_ah_attr)]; + u32 dlid = packet->dlid; + u32 slid = packet->slid; + u32 sl = packet->sl; + bool migrated = packet->migrated; + u16 pkey = packet->pkey; + + if (qp->s_mig_state == IB_MIG_ARMED && migrated) { + if (!packet->grh) { + if ((rdma_ah_get_ah_flags(&qp->alt_ah_attr) & + IB_AH_GRH) && + (packet->etype != RHF_RCV_TYPE_BYPASS)) + return 1; + } else { + const struct ib_global_route *grh; + + if (!(rdma_ah_get_ah_flags(&qp->alt_ah_attr) & + IB_AH_GRH)) + return 1; + grh = rdma_ah_read_grh(&qp->alt_ah_attr); + guid = get_sguid(ibp, grh->sgid_index); + if (!gid_ok(&packet->grh->dgid, ibp->rvp.gid_prefix, + guid)) + return 1; + if (!gid_ok( + &packet->grh->sgid, + grh->dgid.global.subnet_prefix, + grh->dgid.global.interface_id)) + return 1; + } + if (unlikely(rcv_pkey_check(ppd_from_ibp(ibp), pkey, + sc5, slid))) { + hfi1_bad_pkey(ibp, pkey, sl, 0, qp->ibqp.qp_num, + slid, dlid); + return 1; + } + /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */ + if (slid != rdma_ah_get_dlid(&qp->alt_ah_attr) || + ppd_from_ibp(ibp)->port != + rdma_ah_get_port_num(&qp->alt_ah_attr)) + return 1; + spin_lock_irqsave(&qp->s_lock, flags); + hfi1_migrate_qp(qp); + spin_unlock_irqrestore(&qp->s_lock, flags); + } else { + if (!packet->grh) { + if ((rdma_ah_get_ah_flags(&qp->remote_ah_attr) & + IB_AH_GRH) && + (packet->etype != RHF_RCV_TYPE_BYPASS)) + return 1; + } else { + const struct ib_global_route *grh; + + if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & + IB_AH_GRH)) + return 1; + grh = rdma_ah_read_grh(&qp->remote_ah_attr); + guid = get_sguid(ibp, grh->sgid_index); + if (!gid_ok(&packet->grh->dgid, ibp->rvp.gid_prefix, + guid)) + return 1; + if (!gid_ok( + &packet->grh->sgid, + grh->dgid.global.subnet_prefix, + grh->dgid.global.interface_id)) + return 1; + } + if (unlikely(rcv_pkey_check(ppd_from_ibp(ibp), pkey, + sc5, slid))) { + hfi1_bad_pkey(ibp, pkey, sl, 0, qp->ibqp.qp_num, + slid, dlid); + return 1; + } + /* Validate the SLID. See Ch. 9.6.1.5 */ + if ((slid != rdma_ah_get_dlid(&qp->remote_ah_attr)) || + ppd_from_ibp(ibp)->port != qp->port_num) + return 1; + if (qp->s_mig_state == IB_MIG_REARM && !migrated) + qp->s_mig_state = IB_MIG_ARMED; + } + + return 0; +} + +/** + * hfi1_make_grh - construct a GRH header + * @ibp: a pointer to the IB port + * @hdr: a pointer to the GRH header being constructed + * @grh: the global route address to send to + * @hwords: size of header after grh being sent in dwords + * @nwords: the number of 32 bit words of data being sent + * + * Return the size of the header in 32 bit words. + */ +u32 hfi1_make_grh(struct hfi1_ibport *ibp, struct ib_grh *hdr, + const struct ib_global_route *grh, u32 hwords, u32 nwords) +{ + hdr->version_tclass_flow = + cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) | + (grh->traffic_class << IB_GRH_TCLASS_SHIFT) | + (grh->flow_label << IB_GRH_FLOW_SHIFT)); + hdr->paylen = cpu_to_be16((hwords + nwords) << 2); + /* next_hdr is defined by C8-7 in ch. 8.4.1 */ + hdr->next_hdr = IB_GRH_NEXT_HDR; + hdr->hop_limit = grh->hop_limit; + /* The SGID is 32-bit aligned. */ + hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix; + hdr->sgid.global.interface_id = + grh->sgid_index < HFI1_GUIDS_PER_PORT ? + get_sguid(ibp, grh->sgid_index) : + get_sguid(ibp, HFI1_PORT_GUID_INDEX); + hdr->dgid = grh->dgid; + + /* GRH header size in 32-bit words. */ + return sizeof(struct ib_grh) / sizeof(u32); +} + +#define BTH2_OFFSET (offsetof(struct hfi1_sdma_header, \ + hdr.ibh.u.oth.bth[2]) / 4) + +/** + * build_ahg - create ahg in s_ahg + * @qp: a pointer to QP + * @npsn: the next PSN for the request/response + * + * This routine handles the AHG by allocating an ahg entry and causing the + * copy of the first middle. + * + * Subsequent middles use the copied entry, editing the + * PSN with 1 or 2 edits. + */ +static inline void build_ahg(struct rvt_qp *qp, u32 npsn) +{ + struct hfi1_qp_priv *priv = qp->priv; + + if (unlikely(qp->s_flags & HFI1_S_AHG_CLEAR)) + clear_ahg(qp); + if (!(qp->s_flags & HFI1_S_AHG_VALID)) { + /* first middle that needs copy */ + if (qp->s_ahgidx < 0) + qp->s_ahgidx = sdma_ahg_alloc(priv->s_sde); + if (qp->s_ahgidx >= 0) { + qp->s_ahgpsn = npsn; + priv->s_ahg->tx_flags |= SDMA_TXREQ_F_AHG_COPY; + /* save to protect a change in another thread */ + priv->s_ahg->ahgidx = qp->s_ahgidx; + qp->s_flags |= HFI1_S_AHG_VALID; + } + } else { + /* subsequent middle after valid */ + if (qp->s_ahgidx >= 0) { + priv->s_ahg->tx_flags |= SDMA_TXREQ_F_USE_AHG; + priv->s_ahg->ahgidx = qp->s_ahgidx; + priv->s_ahg->ahgcount++; + priv->s_ahg->ahgdesc[0] = + sdma_build_ahg_descriptor( + (__force u16)cpu_to_be16((u16)npsn), + BTH2_OFFSET, + 16, + 16); + if ((npsn & 0xffff0000) != + (qp->s_ahgpsn & 0xffff0000)) { + priv->s_ahg->ahgcount++; + priv->s_ahg->ahgdesc[1] = + sdma_build_ahg_descriptor( + (__force u16)cpu_to_be16( + (u16)(npsn >> 16)), + BTH2_OFFSET, + 0, + 16); + } + } + } +} + +static inline void hfi1_make_ruc_bth(struct rvt_qp *qp, + struct ib_other_headers *ohdr, + u32 bth0, u32 bth1, u32 bth2) +{ + ohdr->bth[0] = cpu_to_be32(bth0); + ohdr->bth[1] = cpu_to_be32(bth1); + ohdr->bth[2] = cpu_to_be32(bth2); +} + +/** + * hfi1_make_ruc_header_16B - build a 16B header + * @qp: the queue pair + * @ohdr: a pointer to the destination header memory + * @bth0: bth0 passed in from the RC/UC builder + * @bth1: bth1 passed in from the RC/UC builder + * @bth2: bth2 passed in from the RC/UC builder + * @middle: non zero implies indicates ahg "could" be used + * @ps: the current packet state + * + * This routine may disarm ahg under these situations: + * - packet needs a GRH + * - BECN needed + * - migration state not IB_MIG_MIGRATED + */ +static inline void hfi1_make_ruc_header_16B(struct rvt_qp *qp, + struct ib_other_headers *ohdr, + u32 bth0, u32 bth1, u32 bth2, + int middle, + struct hfi1_pkt_state *ps) +{ + struct hfi1_qp_priv *priv = qp->priv; + struct hfi1_ibport *ibp = ps->ibp; + struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); + u32 slid; + u16 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index); + u8 l4 = OPA_16B_L4_IB_LOCAL; + u8 extra_bytes = hfi1_get_16b_padding( + (ps->s_txreq->hdr_dwords << 2), + ps->s_txreq->s_cur_size); + u32 nwords = SIZE_OF_CRC + ((ps->s_txreq->s_cur_size + + extra_bytes + SIZE_OF_LT) >> 2); + bool becn = false; + + if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) && + hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))) { + struct ib_grh *grh; + struct ib_global_route *grd = + rdma_ah_retrieve_grh(&qp->remote_ah_attr); + /* + * Ensure OPA GIDs are transformed to IB gids + * before creating the GRH. + */ + if (grd->sgid_index == OPA_GID_INDEX) + grd->sgid_index = 0; + grh = &ps->s_txreq->phdr.hdr.opah.u.l.grh; + l4 = OPA_16B_L4_IB_GLOBAL; + ps->s_txreq->hdr_dwords += + hfi1_make_grh(ibp, grh, grd, + ps->s_txreq->hdr_dwords - LRH_16B_DWORDS, + nwords); + middle = 0; + } + + if (qp->s_mig_state == IB_MIG_MIGRATED) + bth1 |= OPA_BTH_MIG_REQ; + else + middle = 0; + + if (qp->s_flags & RVT_S_ECN) { + qp->s_flags &= ~RVT_S_ECN; + /* we recently received a FECN, so return a BECN */ + becn = true; + middle = 0; + } + if (middle) + build_ahg(qp, bth2); + else + qp->s_flags &= ~HFI1_S_AHG_VALID; + + bth0 |= pkey; + bth0 |= extra_bytes << 20; + hfi1_make_ruc_bth(qp, ohdr, bth0, bth1, bth2); + + if (!ppd->lid) + slid = be32_to_cpu(OPA_LID_PERMISSIVE); + else + slid = ppd->lid | + (rdma_ah_get_path_bits(&qp->remote_ah_attr) & + ((1 << ppd->lmc) - 1)); + + hfi1_make_16b_hdr(&ps->s_txreq->phdr.hdr.opah, + slid, + opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), + 16B), + (ps->s_txreq->hdr_dwords + nwords) >> 1, + pkey, becn, 0, l4, priv->s_sc); +} + +/** + * hfi1_make_ruc_header_9B - build a 9B header + * @qp: the queue pair + * @ohdr: a pointer to the destination header memory + * @bth0: bth0 passed in from the RC/UC builder + * @bth1: bth1 passed in from the RC/UC builder + * @bth2: bth2 passed in from the RC/UC builder + * @middle: non zero implies indicates ahg "could" be used + * @ps: the current packet state + * + * This routine may disarm ahg under these situations: + * - packet needs a GRH + * - BECN needed + * - migration state not IB_MIG_MIGRATED + */ +static inline void hfi1_make_ruc_header_9B(struct rvt_qp *qp, + struct ib_other_headers *ohdr, + u32 bth0, u32 bth1, u32 bth2, + int middle, + struct hfi1_pkt_state *ps) +{ + struct hfi1_qp_priv *priv = qp->priv; + struct hfi1_ibport *ibp = ps->ibp; + u16 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index); + u16 lrh0 = HFI1_LRH_BTH; + u8 extra_bytes = -ps->s_txreq->s_cur_size & 3; + u32 nwords = SIZE_OF_CRC + ((ps->s_txreq->s_cur_size + + extra_bytes) >> 2); + + if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) { + struct ib_grh *grh = &ps->s_txreq->phdr.hdr.ibh.u.l.grh; + + lrh0 = HFI1_LRH_GRH; + ps->s_txreq->hdr_dwords += + hfi1_make_grh(ibp, grh, + rdma_ah_read_grh(&qp->remote_ah_attr), + ps->s_txreq->hdr_dwords - LRH_9B_DWORDS, + nwords); + middle = 0; + } + lrh0 |= (priv->s_sc & 0xf) << 12 | + (rdma_ah_get_sl(&qp->remote_ah_attr) & 0xf) << 4; + + if (qp->s_mig_state == IB_MIG_MIGRATED) + bth0 |= IB_BTH_MIG_REQ; + else + middle = 0; + + if (qp->s_flags & RVT_S_ECN) { + qp->s_flags &= ~RVT_S_ECN; + /* we recently received a FECN, so return a BECN */ + bth1 |= (IB_BECN_MASK << IB_BECN_SHIFT); + middle = 0; + } + if (middle) + build_ahg(qp, bth2); + else + qp->s_flags &= ~HFI1_S_AHG_VALID; + + bth0 |= pkey; + bth0 |= extra_bytes << 20; + hfi1_make_ruc_bth(qp, ohdr, bth0, bth1, bth2); + hfi1_make_ib_hdr(&ps->s_txreq->phdr.hdr.ibh, + lrh0, + ps->s_txreq->hdr_dwords + nwords, + opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), 9B), + ppd_from_ibp(ibp)->lid | + rdma_ah_get_path_bits(&qp->remote_ah_attr)); +} + +typedef void (*hfi1_make_ruc_hdr)(struct rvt_qp *qp, + struct ib_other_headers *ohdr, + u32 bth0, u32 bth1, u32 bth2, int middle, + struct hfi1_pkt_state *ps); + +/* We support only two types - 9B and 16B for now */ +static const hfi1_make_ruc_hdr hfi1_ruc_header_tbl[2] = { + [HFI1_PKT_TYPE_9B] = &hfi1_make_ruc_header_9B, + [HFI1_PKT_TYPE_16B] = &hfi1_make_ruc_header_16B +}; + +void hfi1_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr, + u32 bth0, u32 bth1, u32 bth2, int middle, + struct hfi1_pkt_state *ps) +{ + struct hfi1_qp_priv *priv = qp->priv; + + /* + * reset s_ahg/AHG fields + * + * This insures that the ahgentry/ahgcount + * are at a non-AHG default to protect + * build_verbs_tx_desc() from using + * an include ahgidx. + * + * build_ahg() will modify as appropriate + * to use the AHG feature. + */ + priv->s_ahg->tx_flags = 0; + priv->s_ahg->ahgcount = 0; + priv->s_ahg->ahgidx = 0; + + /* Make the appropriate header */ + hfi1_ruc_header_tbl[priv->hdr_type](qp, ohdr, bth0, bth1, bth2, middle, + ps); +} + +/* when sending, force a reschedule every one of these periods */ +#define SEND_RESCHED_TIMEOUT (5 * HZ) /* 5s in jiffies */ + +/** + * hfi1_schedule_send_yield - test for a yield required for QP + * send engine + * @qp: a pointer to QP + * @ps: a pointer to a structure with commonly lookup values for + * the send engine progress + * @tid: true if it is the tid leg + * + * This routine checks if the time slice for the QP has expired + * for RC QPs, if so an additional work entry is queued. At this + * point, other QPs have an opportunity to be scheduled. It + * returns true if a yield is required, otherwise, false + * is returned. + */ +bool hfi1_schedule_send_yield(struct rvt_qp *qp, struct hfi1_pkt_state *ps, + bool tid) +{ + ps->pkts_sent = true; + + if (unlikely(time_after(jiffies, ps->timeout))) { + if (!ps->in_thread || + workqueue_congested(ps->cpu, ps->ppd->hfi1_wq)) { + spin_lock_irqsave(&qp->s_lock, ps->flags); + if (!tid) { + qp->s_flags &= ~RVT_S_BUSY; + hfi1_schedule_send(qp); + } else { + struct hfi1_qp_priv *priv = qp->priv; + + if (priv->s_flags & + HFI1_S_TID_BUSY_SET) { + qp->s_flags &= ~RVT_S_BUSY; + priv->s_flags &= + ~(HFI1_S_TID_BUSY_SET | + RVT_S_BUSY); + } else { + priv->s_flags &= ~RVT_S_BUSY; + } + hfi1_schedule_tid_send(qp); + } + + spin_unlock_irqrestore(&qp->s_lock, ps->flags); + this_cpu_inc(*ps->ppd->dd->send_schedule); + trace_hfi1_rc_expired_time_slice(qp, true); + return true; + } + + cond_resched(); + this_cpu_inc(*ps->ppd->dd->send_schedule); + ps->timeout = jiffies + ps->timeout_int; + } + + trace_hfi1_rc_expired_time_slice(qp, false); + return false; +} + +void hfi1_do_send_from_rvt(struct rvt_qp *qp) +{ + hfi1_do_send(qp, false); +} + +void _hfi1_do_send(struct work_struct *work) +{ + struct iowait_work *w = container_of(work, struct iowait_work, iowork); + struct rvt_qp *qp = iowait_to_qp(w->iow); + + hfi1_do_send(qp, true); +} + +/** + * hfi1_do_send - perform a send on a QP + * @qp: a pointer to the QP + * @in_thread: true if in a workqueue thread + * + * Process entries in the send work queue until credit or queue is + * exhausted. Only allow one CPU to send a packet per QP. + * Otherwise, two threads could send packets out of order. + */ +void hfi1_do_send(struct rvt_qp *qp, bool in_thread) +{ + struct hfi1_pkt_state ps; + struct hfi1_qp_priv *priv = qp->priv; + int (*make_req)(struct rvt_qp *qp, struct hfi1_pkt_state *ps); + + ps.dev = to_idev(qp->ibqp.device); + ps.ibp = to_iport(qp->ibqp.device, qp->port_num); + ps.ppd = ppd_from_ibp(ps.ibp); + ps.in_thread = in_thread; + ps.wait = iowait_get_ib_work(&priv->s_iowait); + + trace_hfi1_rc_do_send(qp, in_thread); + + switch (qp->ibqp.qp_type) { + case IB_QPT_RC: + if (!loopback && ((rdma_ah_get_dlid(&qp->remote_ah_attr) & + ~((1 << ps.ppd->lmc) - 1)) == + ps.ppd->lid)) { + rvt_ruc_loopback(qp); + return; + } + make_req = hfi1_make_rc_req; + ps.timeout_int = qp->timeout_jiffies; + break; + case IB_QPT_UC: + if (!loopback && ((rdma_ah_get_dlid(&qp->remote_ah_attr) & + ~((1 << ps.ppd->lmc) - 1)) == + ps.ppd->lid)) { + rvt_ruc_loopback(qp); + return; + } + make_req = hfi1_make_uc_req; + ps.timeout_int = SEND_RESCHED_TIMEOUT; + break; + default: + make_req = hfi1_make_ud_req; + ps.timeout_int = SEND_RESCHED_TIMEOUT; + } + + spin_lock_irqsave(&qp->s_lock, ps.flags); + + /* Return if we are already busy processing a work request. */ + if (!hfi1_send_ok(qp)) { + if (qp->s_flags & HFI1_S_ANY_WAIT_IO) + iowait_set_flag(&priv->s_iowait, IOWAIT_PENDING_IB); + spin_unlock_irqrestore(&qp->s_lock, ps.flags); + return; + } + + qp->s_flags |= RVT_S_BUSY; + + ps.timeout_int = ps.timeout_int / 8; + ps.timeout = jiffies + ps.timeout_int; + ps.cpu = priv->s_sde ? priv->s_sde->cpu : + cpumask_first(cpumask_of_node(ps.ppd->dd->node)); + ps.pkts_sent = false; + + /* insure a pre-built packet is handled */ + ps.s_txreq = get_waiting_verbs_txreq(ps.wait); + do { + /* Check for a constructed packet to be sent. */ + if (ps.s_txreq) { + if (priv->s_flags & HFI1_S_TID_BUSY_SET) + qp->s_flags |= RVT_S_BUSY; + spin_unlock_irqrestore(&qp->s_lock, ps.flags); + /* + * If the packet cannot be sent now, return and + * the send engine will be woken up later. + */ + if (hfi1_verbs_send(qp, &ps)) + return; + + /* allow other tasks to run */ + if (hfi1_schedule_send_yield(qp, &ps, false)) + return; + + spin_lock_irqsave(&qp->s_lock, ps.flags); + } + } while (make_req(qp, &ps)); + iowait_starve_clear(ps.pkts_sent, &priv->s_iowait); + spin_unlock_irqrestore(&qp->s_lock, ps.flags); +} |