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Message-ID: <20180907003816.57852-14-alexander.levin@microsoft.com>
Date: Fri, 7 Sep 2018 00:38:28 +0000
From: Sasha Levin <Alexander.Levin@...rosoft.com>
To: "stable@...r.kernel.org" <stable@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: Zhu Yanjun <yanjun.zhu@...cle.com>,
Jason Gunthorpe <jgg@...lanox.com>,
Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.9 14/43] IB/rxe: Drop QP0 silently
From: Zhu Yanjun <yanjun.zhu@...cle.com>
[ Upstream commit 536ca245c512aedfd84cde072d7b3ca14b6e1792 ]
According to "Annex A16: RDMA over Converged Ethernet (RoCE)":
A16.4.3 MANAGEMENT INTERFACES
As defined in the base specification, a special Queue Pair, QP0 is defined
solely for communication between subnet manager(s) and subnet management
agents. Since such an IB-defined subnet management architecture is outside
the scope of this annex, it follows that there is also no requirement that
a port which conforms to this annex be associated with a QP0. Thus, for
end nodes designed to conform to this annex, the concept of QP0 is
undefined and unused for any port connected to an Ethernet network.
CA16-8: A packet arriving at a RoCE port containing a BTH with the
destination QP field set to QP0 shall be silently dropped.
Signed-off-by: Zhu Yanjun <yanjun.zhu@...cle.com>
Acked-by: Moni Shoua <monis@...lanox.com>
Reviewed-by: Yuval Shaia <yuval.shaia@...cle.com>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
drivers/infiniband/sw/rxe/rxe_recv.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/sw/rxe/rxe_recv.c b/drivers/infiniband/sw/rxe/rxe_recv.c
index 46f062842a9a..db6bb026ae90 100644
--- a/drivers/infiniband/sw/rxe/rxe_recv.c
+++ b/drivers/infiniband/sw/rxe/rxe_recv.c
@@ -225,9 +225,14 @@ static int hdr_check(struct rxe_pkt_info *pkt)
goto err1;
}
+ if (unlikely(qpn == 0)) {
+ pr_warn_once("QP 0 not supported");
+ goto err1;
+ }
+
if (qpn != IB_MULTICAST_QPN) {
- index = (qpn == 0) ? port->qp_smi_index :
- ((qpn == 1) ? port->qp_gsi_index : qpn);
+ index = (qpn == 1) ? port->qp_gsi_index : qpn;
+
qp = rxe_pool_get_index(&rxe->qp_pool, index);
if (unlikely(!qp)) {
pr_warn_ratelimited("no qp matches qpn 0x%x\n", qpn);
--
2.17.1
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