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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>,
        Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>,
        Jason Gunthorpe <jgg@nvidia.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.15 515/913] IB/hfi1: Allow larger MTU without AIP
Date:   Tue,  5 Apr 2022 09:26:17 +0200
Message-Id: <20220405070355.290973807@linuxfoundation.org>
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References: <20220405070339.801210740@linuxfoundation.org>
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From: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>

[ Upstream commit b135e324d7a2e7fa0a7ef925076136e799b79f44 ]

The AIP code signals the phys_mtu in the following query_port()
fragment:

	props->phys_mtu = HFI1_CAP_IS_KSET(AIP) ? hfi1_max_mtu :
				ib_mtu_enum_to_int(props->max_mtu);

Using the largest MTU possible should not depend on AIP.

Fix by unconditionally using the hfi1_max_mtu value.

Fixes: 6d72344cf6c4 ("IB/ipoib: Increase ipoib Datagram mode MTU's upper limit")
Link: https://lore.kernel.org/r/1644348309-174874-1-git-send-email-mike.marciniszyn@cornelisnetworks.com
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/infiniband/hw/hfi1/verbs.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/verbs.c b/drivers/infiniband/hw/hfi1/verbs.c
index 26bea51869bf..ef8e0bdacb51 100644
--- a/drivers/infiniband/hw/hfi1/verbs.c
+++ b/drivers/infiniband/hw/hfi1/verbs.c
@@ -1397,8 +1397,7 @@ static int query_port(struct rvt_dev_info *rdi, u32 port_num,
 				      4096 : hfi1_max_mtu), IB_MTU_4096);
 	props->active_mtu = !valid_ib_mtu(ppd->ibmtu) ? props->max_mtu :
 		mtu_to_enum(ppd->ibmtu, IB_MTU_4096);
-	props->phys_mtu = HFI1_CAP_IS_KSET(AIP) ? hfi1_max_mtu :
-				ib_mtu_enum_to_int(props->max_mtu);
+	props->phys_mtu = hfi1_max_mtu;
 
 	return 0;
 }
-- 
2.34.1