cxgb4vf: add call to Firmware to reset VF State.

Add call to Firmware to reset its VF State when we first attach to the VF.

Signed-off-by: Casey Leedom <leedom@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/net/cxgb4vf/cxgb4vf_main.c b/drivers/net/cxgb4vf/cxgb4vf_main.c
index 8da3bda13f33..c3449bbc585a 100644
--- a/drivers/net/cxgb4vf/cxgb4vf_main.c
+++ b/drivers/net/cxgb4vf/cxgb4vf_main.c
@@ -2065,6 +2065,22 @@ static int adap_init0(struct adapter *adapter)
         }
 
         /*
+         * Some environments do not properly handle PCIE FLRs -- e.g. in Linux
+         * 2.6.31 and later we can't call pci_reset_function() in order to
+         * issue an FLR because of a self- deadlock on the device semaphore.
+         * Meanwhile, the OS infrastructure doesn't issue FLRs in all the
+         * cases where they're needed -- for instance, some versions of KVM
+         * fail to reset "Assigned Devices" when the VM reboots.  Therefore we
+         * use the firmware based reset in order to reset any per function
+         * state.
+         */
+        err = t4vf_fw_reset(adapter);
+        if (err < 0) {
+                dev_err(adapter->pdev_dev, "FW reset failed: err=%d\n", err);
+                return err;
+        }
+
+        /*
          * Grab basic operational parameters.  These will predominantly have
          * been set up by the Physical Function Driver or will be hard coded
          * into the adapter.  We just have to live with them ...  Note that