cxgb4: Allow firmware flash, only if cxgb4 is the master driver

Adapter can go for a toss, if cxgb4 is loaded as slave and we try to
upgrade the firmware. So add a check for the same before flashing
firmware using ethtool.

Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ethtool.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ethtool.c
index 687acf7..5eedb98 100644 (file)
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ethtool.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_ethtool.c
@@ -925,6 +925,20 @@ static int set_flash(struct net_device *netdev, struct ethtool_flash *ef)
        const struct firmware *fw;
        struct adapter *adap = netdev2adap(netdev);
        unsigned int mbox = PCIE_FW_MASTER_M + 1;
+       u32 pcie_fw;
+       unsigned int master;
+       u8 master_vld = 0;
+
+       pcie_fw = t4_read_reg(adap, PCIE_FW_A);
+       master = PCIE_FW_MASTER_G(pcie_fw);
+       if (pcie_fw & PCIE_FW_MASTER_VLD_F)
+               master_vld = 1;
+       /* if csiostor is the master return */
+       if (master_vld && (master != adap->pf)) {
+               dev_warn(adap->pdev_dev,
+                        "cxgb4 driver needs to be loaded as MASTER to support FW flash\n");
+               return -EOPNOTSUPP;
+       }
 
        ef->data[sizeof(ef->data) - 1] = '\0';
        ret = request_firmware(&fw, ef->data, adap->pdev_dev);