linux-kernel - [PATCH 5.4 078/120] iavf: Fix set max MTU size with port VLAN and jumbo frames

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Date:   Mon, 26 Sep 2022 12:11:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Michal Jaron <michalx.jaron@...el.com>,
        Mateusz Palczewski <mateusz.palczewski@...el.com>,
        Konrad Jankowski <konrad0.jankowski@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 078/120] iavf: Fix set max MTU size with port VLAN and jumbo frames

From: Michal Jaron <michalx.jaron@...el.com>

[ Upstream commit 399c98c4dc50b7eb7e9f24da7ffdda6f025676ef ]

After setting port VLAN and MTU to 9000 on VF with ice driver there
was an iavf error
"PF returned error -5 (IAVF_ERR_PARAM) to our request 6".

During queue configuration, VF's max packet size was set to
IAVF_MAX_RXBUFFER but on ice max frame size was smaller by VLAN_HLEN
due to making some space for port VLAN as VF is not aware whether it's
in a port VLAN. This mismatch in sizes caused ice to reject queue
configuration with ERR_PARAM error. Proper max_mtu is sent from ice PF
to VF with GET_VF_RESOURCES msg but VF does not look at this.

In iavf change max_frame from IAVF_MAX_RXBUFFER to max_mtu
received from pf with GET_VF_RESOURCES msg to make vf's
max_frame_size dependent from pf. Add check if received max_mtu is
not in eligible range then set it to IAVF_MAX_RXBUFFER.

Fixes: dab86afdbbd1 ("i40e/i40evf: Change the way we limit the maximum frame size for Rx")
Signed-off-by: Michal Jaron <michalx.jaron@...el.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@...el.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/intel/iavf/iavf_virtchnl.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
index 4d471a6f2946..7a17694b6a0b 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
@@ -241,11 +241,14 @@ int iavf_get_vf_config(struct iavf_adapter *adapter)
 void iavf_configure_queues(struct iavf_adapter *adapter)
 {
 	struct virtchnl_vsi_queue_config_info *vqci;
-	struct virtchnl_queue_pair_info *vqpi;
+	int i, max_frame = adapter->vf_res->max_mtu;
 	int pairs = adapter->num_active_queues;
-	int i, max_frame = IAVF_MAX_RXBUFFER;
+	struct virtchnl_queue_pair_info *vqpi;
 	size_t len;
 
+	if (max_frame > IAVF_MAX_RXBUFFER || !max_frame)
+		max_frame = IAVF_MAX_RXBUFFER;
+
 	if (adapter->current_op != VIRTCHNL_OP_UNKNOWN) {
 		/* bail because we already have a command pending */
 		dev_err(&adapter->pdev->dev, "Cannot configure queues, command %d pending\n",
-- 
2.35.1