bnx2x, cnic: Disable iSCSI if DCBX negotiation is successful

With current bnx2x firmware 6.2.9, iSCSI is not supported in DCB
network, so we need to disable it.  Add cnic command to disconnect
iSCSI connections and prevent future connections when DCBX negotiation
succeeds.

Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 33 insertions, 2 deletions

diff --git a/drivers/net/bnx2x/bnx2x_dcb.c b/drivers/net/bnx2x/bnx2x_dcb.c
index 9a24d79c71d9..1214907d00d9 100644
--- a/drivers/net/bnx2x/bnx2x_dcb.c
+++ b/drivers/net/bnx2x/bnx2x_dcb.c
@@ -571,6 +571,28 @@ void bnx2x_dcbx_set_params(struct bnx2x *bp, u32 state)
 {
         switch (state) {
         case BNX2X_DCBX_STATE_NEG_RECEIVED:
+#ifdef BCM_CNIC
+                if (bp->state != BNX2X_STATE_OPENING_WAIT4_LOAD) {
+                        struct cnic_ops *c_ops;
+                        struct cnic_eth_dev *cp = &bp->cnic_eth_dev;
+                        bp->flags |= NO_ISCSI_OOO_FLAG | NO_ISCSI_FLAG;
+                        cp->drv_state |= CNIC_DRV_STATE_NO_ISCSI_OOO;
+                        cp->drv_state |= CNIC_DRV_STATE_NO_ISCSI;
+
+                        rcu_read_lock();
+                        c_ops = rcu_dereference(bp->cnic_ops);
+                        if (c_ops) {
+                                bnx2x_cnic_notify(bp, CNIC_CTL_STOP_ISCSI_CMD);
+                                rcu_read_unlock();
+                                return;
+                        }
+                        rcu_read_unlock();
+                }
+
+                /* fall through if no CNIC initialized  */
+        case BNX2X_DCBX_STATE_ISCSI_STOPPED:
+#endif
+
                 {
                         DP(NETIF_MSG_LINK, "BNX2X_DCBX_STATE_NEG_RECEIVED\n");
 #ifdef BCM_DCBNL
diff --git a/drivers/net/bnx2x/bnx2x_dcb.h b/drivers/net/bnx2x/bnx2x_dcb.h
index 71b8eda43bd0..1e14775a18cb 100644
--- a/drivers/net/bnx2x/bnx2x_dcb.h
+++ b/drivers/net/bnx2x/bnx2x_dcb.h
@@ -183,9 +183,13 @@ void bnx2x_dcbx_set_state(struct bnx2x *bp, bool dcb_on, u32 dcbx_enabled);
 
 enum {
         BNX2X_DCBX_STATE_NEG_RECEIVED = 0x1,
-        BNX2X_DCBX_STATE_TX_PAUSED = 0x2,
-        BNX2X_DCBX_STATE_TX_RELEASED = 0x4
+#ifdef BCM_CNIC
+        BNX2X_DCBX_STATE_ISCSI_STOPPED,
+#endif
+        BNX2X_DCBX_STATE_TX_PAUSED,
+        BNX2X_DCBX_STATE_TX_RELEASED
 };
+
 void bnx2x_dcbx_set_params(struct bnx2x *bp, u32 state);
 
 /* DCB netlink */
diff --git a/drivers/net/bnx2x/bnx2x_main.c b/drivers/net/bnx2x/bnx2x_main.c
index 32e64cc85d2c..f3cf88918a9e 100644
--- a/drivers/net/bnx2x/bnx2x_main.c
+++ b/drivers/net/bnx2x/bnx2x_main.c
@@ -10342,6 +10342,11 @@ static int bnx2x_drv_ctl(struct net_device *dev, struct drv_ctl_info *ctl)
                 break;
         }
 
+        case DRV_CTL_ISCSI_STOPPED_CMD: {
+                bnx2x_dcbx_set_params(bp, BNX2X_DCBX_STATE_ISCSI_STOPPED);
+                break;
+        }
+
         default:
                 BNX2X_ERR("unknown command %x\n", ctl->cmd);
                 rc = -EINVAL;