From 90fdae66e72bf0381d168f12dca0259617927895 Mon Sep 17 00:00:00 2001 From: Kaike Wan Date: Thu, 15 Aug 2019 15:20:51 -0400 Subject: [PATCH] IB/hfi1: Add additional checks when handling TID RDMA WRITE DATA packet In a congested fabric with adaptive routing enabled, traces show that packets could be delivered out of order, which could cause incorrect processing of stale packets. For stale TID RDMA WRITE DATA packets that cause KDETH EFLAGS errors, this patch adds additional checks before processing the packets. Fixes: d72fe7d5008b ("IB/hfi1: Add a function to receive TID RDMA WRITE DATA packet") Cc: Reviewed-by: Mike Marciniszyn Signed-off-by: Kaike Wan Signed-off-by: Dennis Dalessandro Link: https://lore.kernel.org/r/20190815192051.105923.69979.stgit@awfm-01.aw.intel.com Signed-off-by: Doug Ledford --- drivers/infiniband/hw/hfi1/tid_rdma.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/infiniband/hw/hfi1/tid_rdma.c b/drivers/infiniband/hw/hfi1/tid_rdma.c index 23bb2498e5b4..7bccb59d8a30 100644 --- a/drivers/infiniband/hw/hfi1/tid_rdma.c +++ b/drivers/infiniband/hw/hfi1/tid_rdma.c @@ -2945,8 +2945,15 @@ bool hfi1_handle_kdeth_eflags(struct hfi1_ctxtdata *rcd, */ spin_lock(&qp->s_lock); qpriv = qp->priv; + if (qpriv->r_tid_tail == HFI1_QP_WQE_INVALID || + qpriv->r_tid_tail == qpriv->r_tid_head) + goto unlock; e = &qp->s_ack_queue[qpriv->r_tid_tail]; + if (e->opcode != TID_OP(WRITE_REQ)) + goto unlock; req = ack_to_tid_req(e); + if (req->comp_seg == req->cur_seg) + goto unlock; flow = &req->flows[req->clear_tail]; trace_hfi1_eflags_err_write(qp, rcv_type, rte, psn); trace_hfi1_rsp_handle_kdeth_eflags(qp, psn); -- 2.30.2