From: Mike Marciniszyn <mike.marciniszyn@intel.com>
Date: Tue, 26 Feb 2019 08:45:16 -0800
Subject: IB/rdmavt: Fix loopback send with invalidate ordering
Patch-mainline: v5.1-rc1
Git-commit: 38bbc9f0381550d1d227fc57afa08436e36b32fc
References: jsc#SLE-4925

The IBTA spec notes:

o9-5.2.1: For any HCA which supports SEND with Invalidate, upon receiving
an IETH, the Invalidate operation must not take place until after the
normal transport header validation checks have been successfully
completed.

The rdmavt loopback code does the validation after the invalidate.

Fix by relocating the operation specific logic for all SEND variants until
after the validity checks.

Cc: <stable@vger.kernel.org> #v4.20+
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/sw/rdmavt/qp.c |   26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

--- a/drivers/infiniband/sw/rdmavt/qp.c
+++ b/drivers/infiniband/sw/rdmavt/qp.c
@@ -2898,18 +2898,8 @@ again:
 		goto send_comp;
 
 	case IB_WR_SEND_WITH_INV:
-		if (!rvt_invalidate_rkey(qp, wqe->wr.ex.invalidate_rkey)) {
-			wc.wc_flags = IB_WC_WITH_INVALIDATE;
-			wc.ex.invalidate_rkey = wqe->wr.ex.invalidate_rkey;
-		}
-		goto send;
-
 	case IB_WR_SEND_WITH_IMM:
-		wc.wc_flags = IB_WC_WITH_IMM;
-		wc.ex.imm_data = wqe->wr.ex.imm_data;
-		/* FALLTHROUGH */
 	case IB_WR_SEND:
-send:
 		ret = rvt_get_rwqe(qp, false);
 		if (ret < 0)
 			goto op_err;
@@ -2917,6 +2907,22 @@ send:
 			goto rnr_nak;
 		if (wqe->length > qp->r_len)
 			goto inv_err;
+		switch (wqe->wr.opcode) {
+		case IB_WR_SEND_WITH_INV:
+			if (!rvt_invalidate_rkey(qp,
+						 wqe->wr.ex.invalidate_rkey)) {
+				wc.wc_flags = IB_WC_WITH_INVALIDATE;
+				wc.ex.invalidate_rkey =
+					wqe->wr.ex.invalidate_rkey;
+			}
+			break;
+		case IB_WR_SEND_WITH_IMM:
+			wc.wc_flags = IB_WC_WITH_IMM;
+			wc.ex.imm_data = wqe->wr.ex.imm_data;
+			break;
+		default:
+			break;
+		}
 		break;
 
 	case IB_WR_RDMA_WRITE_WITH_IMM: