From 7199435414868bd656284349edc1a1f528fe3662 Mon Sep 17 00:00:00 2001 From: Kaike Wan Date: Wed, 11 Sep 2019 07:30:47 -0400 Subject: [PATCH] IB/{rdmavt, hfi1, qib}: Add a counter for credit waits This patch adds a counter for credit waits to assist field debugging. Link: https://lore.kernel.org/r/20190911113047.126040.10857.stgit@awfm-01.aw.intel.com Reviewed-by: Mike Marciniszyn Signed-off-by: Kaike Wan Signed-off-by: Mike Marciniszyn Signed-off-by: Dennis Dalessandro Signed-off-by: Jason Gunthorpe --- drivers/infiniband/hw/hfi1/chip.c | 2 ++ drivers/infiniband/hw/hfi1/chip.h | 1 + drivers/infiniband/hw/hfi1/rc.c | 10 ++------ drivers/infiniband/hw/qib/qib_rc.c | 10 ++------ drivers/infiniband/hw/qib/qib_sysfs.c | 2 ++ include/rdma/rdma_vt.h | 1 + include/rdma/rdmavt_qp.h | 35 +++++++++++++++++++++++++++ 7 files changed, 45 insertions(+), 16 deletions(-) diff --git a/drivers/infiniband/hw/hfi1/chip.c b/drivers/infiniband/hw/hfi1/chip.c index 67052dc3100c..9b1fb84a3d45 100644 --- a/drivers/infiniband/hw/hfi1/chip.c +++ b/drivers/infiniband/hw/hfi1/chip.c @@ -4101,6 +4101,7 @@ def_access_ibp_counter(rc_dupreq); def_access_ibp_counter(rdma_seq); def_access_ibp_counter(unaligned); def_access_ibp_counter(seq_naks); +def_access_ibp_counter(rc_crwaits); static struct cntr_entry dev_cntrs[DEV_CNTR_LAST] = { [C_RCV_OVF] = RXE32_DEV_CNTR_ELEM(RcvOverflow, RCV_BUF_OVFL_CNT, CNTR_SYNTH), @@ -5119,6 +5120,7 @@ static struct cntr_entry port_cntrs[PORT_CNTR_LAST] = { [C_SW_IBP_RDMA_SEQ] = SW_IBP_CNTR(RdmaSeq, rdma_seq), [C_SW_IBP_UNALIGNED] = SW_IBP_CNTR(Unaligned, unaligned), [C_SW_IBP_SEQ_NAK] = SW_IBP_CNTR(SeqNak, seq_naks), +[C_SW_IBP_RC_CRWAITS] = SW_IBP_CNTR(RcCrWait, rc_crwaits), [C_SW_CPU_RC_ACKS] = CNTR_ELEM("RcAcks", 0, 0, CNTR_NORMAL, access_sw_cpu_rc_acks), [C_SW_CPU_RC_QACKS] = CNTR_ELEM("RcQacks", 0, 0, CNTR_NORMAL, diff --git a/drivers/infiniband/hw/hfi1/chip.h b/drivers/infiniband/hw/hfi1/chip.h index b76cf81f927f..4ca5ac8d7e9e 100644 --- a/drivers/infiniband/hw/hfi1/chip.h +++ b/drivers/infiniband/hw/hfi1/chip.h @@ -1245,6 +1245,7 @@ enum { C_SW_IBP_RDMA_SEQ, C_SW_IBP_UNALIGNED, C_SW_IBP_SEQ_NAK, + C_SW_IBP_RC_CRWAITS, C_SW_CPU_RC_ACKS, C_SW_CPU_RC_QACKS, C_SW_CPU_RC_DELAYED_COMP, diff --git a/drivers/infiniband/hw/hfi1/rc.c b/drivers/infiniband/hw/hfi1/rc.c index eeca08d3b470..513a8aac9ccd 100644 --- a/drivers/infiniband/hw/hfi1/rc.c +++ b/drivers/infiniband/hw/hfi1/rc.c @@ -595,11 +595,8 @@ int hfi1_make_rc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps) case IB_WR_SEND_WITH_IMM: case IB_WR_SEND_WITH_INV: /* If no credit, return. */ - if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) && - rvt_cmp_msn(wqe->ssn, qp->s_lsn + 1) > 0) { - qp->s_flags |= RVT_S_WAIT_SSN_CREDIT; + if (!rvt_rc_credit_avail(qp, wqe)) goto bail; - } if (len > pmtu) { qp->s_state = OP(SEND_FIRST); len = pmtu; @@ -632,11 +629,8 @@ int hfi1_make_rc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps) goto no_flow_control; case IB_WR_RDMA_WRITE_WITH_IMM: /* If no credit, return. */ - if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) && - rvt_cmp_msn(wqe->ssn, qp->s_lsn + 1) > 0) { - qp->s_flags |= RVT_S_WAIT_SSN_CREDIT; + if (!rvt_rc_credit_avail(qp, wqe)) goto bail; - } no_flow_control: put_ib_reth_vaddr( wqe->rdma_wr.remote_addr, diff --git a/drivers/infiniband/hw/qib/qib_rc.c b/drivers/infiniband/hw/qib/qib_rc.c index 1d5e2d4ee257..aaf7438258fa 100644 --- a/drivers/infiniband/hw/qib/qib_rc.c +++ b/drivers/infiniband/hw/qib/qib_rc.c @@ -313,11 +313,8 @@ int qib_make_rc_req(struct rvt_qp *qp, unsigned long *flags) case IB_WR_SEND: case IB_WR_SEND_WITH_IMM: /* If no credit, return. */ - if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) && - rvt_cmp_msn(wqe->ssn, qp->s_lsn + 1) > 0) { - qp->s_flags |= RVT_S_WAIT_SSN_CREDIT; + if (!rvt_rc_credit_avail(qp, wqe)) goto bail; - } if (len > pmtu) { qp->s_state = OP(SEND_FIRST); len = pmtu; @@ -344,11 +341,8 @@ int qib_make_rc_req(struct rvt_qp *qp, unsigned long *flags) goto no_flow_control; case IB_WR_RDMA_WRITE_WITH_IMM: /* If no credit, return. */ - if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) && - rvt_cmp_msn(wqe->ssn, qp->s_lsn + 1) > 0) { - qp->s_flags |= RVT_S_WAIT_SSN_CREDIT; + if (!rvt_rc_credit_avail(qp, wqe)) goto bail; - } no_flow_control: ohdr->u.rc.reth.vaddr = cpu_to_be64(wqe->rdma_wr.remote_addr); diff --git a/drivers/infiniband/hw/qib/qib_sysfs.c b/drivers/infiniband/hw/qib/qib_sysfs.c index 905206a0c2d5..3926be78036e 100644 --- a/drivers/infiniband/hw/qib/qib_sysfs.c +++ b/drivers/infiniband/hw/qib/qib_sysfs.c @@ -436,6 +436,7 @@ QIB_DIAGC_ATTR(dmawait); QIB_DIAGC_ATTR(unaligned); QIB_DIAGC_ATTR(rc_dupreq); QIB_DIAGC_ATTR(rc_seqnak); +QIB_DIAGC_ATTR(rc_crwaits); static struct attribute *diagc_default_attributes[] = { &qib_diagc_attr_rc_resends.attr, @@ -453,6 +454,7 @@ static struct attribute *diagc_default_attributes[] = { &qib_diagc_attr_unaligned.attr, &qib_diagc_attr_rc_dupreq.attr, &qib_diagc_attr_rc_seqnak.attr, + &qib_diagc_attr_rc_crwaits.attr, NULL }; diff --git a/include/rdma/rdma_vt.h b/include/rdma/rdma_vt.h index 525848e227dc..ac5a9430abb6 100644 --- a/include/rdma/rdma_vt.h +++ b/include/rdma/rdma_vt.h @@ -116,6 +116,7 @@ struct rvt_ibport { u64 n_unaligned; u64 n_rc_dupreq; u64 n_rc_seqnak; + u64 n_rc_crwaits; u16 pkey_violations; u16 qkey_violations; u16 mkey_violations; diff --git a/include/rdma/rdmavt_qp.h b/include/rdma/rdmavt_qp.h index e06c77d76463..b550ae89bf85 100644 --- a/include/rdma/rdmavt_qp.h +++ b/include/rdma/rdmavt_qp.h @@ -973,6 +973,41 @@ static inline void rvt_free_rq(struct rvt_rq *rq) rq->wq = NULL; } +/** + * rvt_to_iport - Get the ibport pointer + * @qp: the qp pointer + * + * This function returns the ibport pointer from the qp pointer. + */ +static inline struct rvt_ibport *rvt_to_iport(struct rvt_qp *qp) +{ + struct rvt_dev_info *rdi = ib_to_rvt(qp->ibqp.device); + + return rdi->ports[qp->port_num - 1]; +} + +/** + * rvt_rc_credit_avail - Check if there are enough RC credits for the request + * @qp: the qp + * @wqe: the request + * + * This function returns false when there are not enough credits for the given + * request and true otherwise. + */ +static inline bool rvt_rc_credit_avail(struct rvt_qp *qp, struct rvt_swqe *wqe) +{ + lockdep_assert_held(&qp->s_lock); + if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) && + rvt_cmp_msn(wqe->ssn, qp->s_lsn + 1) > 0) { + struct rvt_ibport *rvp = rvt_to_iport(qp); + + qp->s_flags |= RVT_S_WAIT_SSN_CREDIT; + rvp->n_rc_crwaits++; + return false; + } + return true; +} + struct rvt_qp_iter *rvt_qp_iter_init(struct rvt_dev_info *rdi, u64 v, void (*cb)(struct rvt_qp *qp, u64 v));