netdev - [PATCH net v3 1/2] ice: Prevent set_channel from changing queues while RDMA active

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Message-Id: <20230120211231.431147-2-anthony.l.nguyen@intel.com>
Date:   Fri, 20 Jan 2023 13:12:30 -0800
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com
Cc:     Dave Ertman <david.m.ertman@...el.com>, netdev@...r.kernel.org,
        anthony.l.nguyen@...el.com, leonro@...dia.com,
        Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
        Gurucharan G <gurucharanx.g@...el.com>
Subject: [PATCH net v3 1/2] ice: Prevent set_channel from changing queues while RDMA active

From: Dave Ertman <david.m.ertman@...el.com>

The PF controls the set of queues that the RDMA auxiliary_driver requests
resources from.  The set_channel command will alter that pool and trigger a
reconfiguration of the VSI, which breaks RDMA functionality.

Prevent set_channel from executing when RDMA driver bound to auxiliary
device.

Fixes: 348048e724a0 ("ice: Implement iidc operations")
Co-developed-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
Signed-off-by: Dave Ertman <david.m.ertman@...el.com>
Tested-by: Gurucharan G <gurucharanx.g@...el.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/ice/ice_ethtool.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
index 4191994d8f3a..16006eedfceb 100644
--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
+++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
@@ -3705,6 +3705,14 @@ static int ice_set_channels(struct net_device *dev, struct ethtool_channels *ch)
 		return -EINVAL;
 	}
 
+	mutex_lock(&pf->adev_mutex);
+	if (pf->adev && pf->adev->dev.driver) {
+		netdev_err(dev, "Cannot change channels when RDMA is active\n");
+		mutex_unlock(&pf->adev_mutex);
+		return -EINVAL;
+	}
+	mutex_unlock(&pf->adev_mutex);
+
 	ice_vsi_recfg_qs(vsi, new_rx, new_tx);
 
 	if (!netif_is_rxfh_configured(dev))
-- 
2.38.1