From: Mike Marciniszyn mike.marciniszyn@intel.com
[ Upstream commit 4bb02e9572af1383038d83ad196d7166c515f2ee ]
SDMA and pio flushes will cause a lot of packets to be transmitted after a link has gone down, using a lot of CPU to retransmit packets.
Fix for RC QPs by recognizing the flush status and: - Forcing a timer start - Putting the QP into a "send one" mode
Fixes: 7724105686e7 ("IB/hfi1: add driver files") Reviewed-by: Kaike Wan kaike.wan@intel.com Signed-off-by: Mike Marciniszyn mike.marciniszyn@intel.com Signed-off-by: Dennis Dalessandro dennis.dalessandro@intel.com Signed-off-by: Doug Ledford dledford@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/hw/hfi1/rc.c | 30 ++++++++++++++++++++++++++++++ drivers/infiniband/hw/hfi1/verbs.c | 10 ++++++---- drivers/infiniband/hw/hfi1/verbs.h | 1 + 3 files changed, 37 insertions(+), 4 deletions(-)
diff --git a/drivers/infiniband/hw/hfi1/rc.c b/drivers/infiniband/hw/hfi1/rc.c index 82f101878e33..24cbac277bf0 100644 --- a/drivers/infiniband/hw/hfi1/rc.c +++ b/drivers/infiniband/hw/hfi1/rc.c @@ -1703,6 +1703,36 @@ static void reset_sending_psn(struct rvt_qp *qp, u32 psn) } }
+/** + * hfi1_rc_verbs_aborted - handle abort status + * @qp: the QP + * @opah: the opa header + * + * This code modifies both ACK bit in BTH[2] + * and the s_flags to go into send one mode. + * + * This serves to throttle the send engine to only + * send a single packet in the likely case the + * a link has gone down. + */ +void hfi1_rc_verbs_aborted(struct rvt_qp *qp, struct hfi1_opa_header *opah) +{ + struct ib_other_headers *ohdr = hfi1_get_rc_ohdr(opah); + u8 opcode = ib_bth_get_opcode(ohdr); + u32 psn; + + /* ignore responses */ + if ((opcode >= OP(RDMA_READ_RESPONSE_FIRST) && + opcode <= OP(ATOMIC_ACKNOWLEDGE)) || + opcode == TID_OP(READ_RESP) || + opcode == TID_OP(WRITE_RESP)) + return; + + psn = ib_bth_get_psn(ohdr) | IB_BTH_REQ_ACK; + ohdr->bth[2] = cpu_to_be32(psn); + qp->s_flags |= RVT_S_SEND_ONE; +} + /* * This should be called with the QP s_lock held and interrupts disabled. */ diff --git a/drivers/infiniband/hw/hfi1/verbs.c b/drivers/infiniband/hw/hfi1/verbs.c index 55a56b3d7f83..8d64972c6226 100644 --- a/drivers/infiniband/hw/hfi1/verbs.c +++ b/drivers/infiniband/hw/hfi1/verbs.c @@ -638,6 +638,8 @@ static void verbs_sdma_complete( struct hfi1_opa_header *hdr;
hdr = &tx->phdr.hdr; + if (unlikely(status == SDMA_TXREQ_S_ABORTED)) + hfi1_rc_verbs_aborted(qp, hdr); hfi1_rc_send_complete(qp, hdr); } spin_unlock(&qp->s_lock); @@ -1095,15 +1097,15 @@ int hfi1_verbs_send_pio(struct rvt_qp *qp, struct hfi1_pkt_state *ps, &ps->s_txreq->phdr.hdr, ib_is_sc5(sc5));
pio_bail: + spin_lock_irqsave(&qp->s_lock, flags); if (qp->s_wqe) { - spin_lock_irqsave(&qp->s_lock, flags); rvt_send_complete(qp, qp->s_wqe, wc_status); - spin_unlock_irqrestore(&qp->s_lock, flags); } else if (qp->ibqp.qp_type == IB_QPT_RC) { - spin_lock_irqsave(&qp->s_lock, flags); + if (unlikely(wc_status == IB_WC_GENERAL_ERR)) + hfi1_rc_verbs_aborted(qp, &ps->s_txreq->phdr.hdr); hfi1_rc_send_complete(qp, &ps->s_txreq->phdr.hdr); - spin_unlock_irqrestore(&qp->s_lock, flags); } + spin_unlock_irqrestore(&qp->s_lock, flags);
ret = 0;
diff --git a/drivers/infiniband/hw/hfi1/verbs.h b/drivers/infiniband/hw/hfi1/verbs.h index 62ace0b2d17a..1714c0f6475d 100644 --- a/drivers/infiniband/hw/hfi1/verbs.h +++ b/drivers/infiniband/hw/hfi1/verbs.h @@ -415,6 +415,7 @@ void hfi1_rc_hdrerr(
u8 ah_to_sc(struct ib_device *ibdev, struct rdma_ah_attr *ah_attr);
+void hfi1_rc_verbs_aborted(struct rvt_qp *qp, struct hfi1_opa_header *opah); void hfi1_rc_send_complete(struct rvt_qp *qp, struct hfi1_opa_header *opah);
void hfi1_ud_rcv(struct hfi1_packet *packet);