cnic: Fine-tune ring init code.

Initialize the rings only during cnic_uio_open() and shut them down
during cnic_uio_close().  Check for the new bit CNIC_LCL_FL_RINGS_INITED
before checking for ring interrupt.

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

2 files changed, 19 insertions, 6 deletions

diff --git a/drivers/net/cnic.c b/drivers/net/cnic.c
index 50cded7fff51..4e9d4ae1f303 100644
--- a/drivers/net/cnic.c
+++ b/drivers/net/cnic.c
@@ -2202,13 +2202,14 @@ static int cnic_l2_completion(struct cnic_local *cp)
 
 static void cnic_chk_pkt_rings(struct cnic_local *cp)
 {
-        u16 rx_cons = *cp->rx_cons_ptr;
-        u16 tx_cons = *cp->tx_cons_ptr;
+        u16 rx_cons, tx_cons;
         int comp = 0;
 
-        if (!test_bit(CNIC_F_CNIC_UP, &cp->dev->flags))
+        if (!test_bit(CNIC_LCL_FL_RINGS_INITED, &cp->cnic_local_flags))
                 return;
 
+        rx_cons = *cp->rx_cons_ptr;
+        tx_cons = *cp->tx_cons_ptr;
         if (cp->tx_cons != tx_cons || cp->rx_cons != rx_cons) {
                 if (test_bit(CNIC_LCL_FL_L2_WAIT, &cp->cnic_local_flags))
                         comp = cnic_l2_completion(cp);
@@ -4202,17 +4203,20 @@ static int cnic_start_bnx2x_hw(struct cnic_dev *dev)
         if (ret)
                 return ret;
 
-        cnic_init_bnx2x_tx_ring(dev);
-        cnic_init_bnx2x_rx_ring(dev);
-
         return 0;
 }
 
 static void cnic_init_rings(struct cnic_dev *dev)
 {
+        struct cnic_local *cp = dev->cnic_priv;
+
+        if (test_bit(CNIC_LCL_FL_RINGS_INITED, &cp->cnic_local_flags))
+                return;
+
         if (test_bit(CNIC_F_BNX2_CLASS, &dev->flags)) {
                 cnic_init_bnx2_tx_ring(dev);
                 cnic_init_bnx2_rx_ring(dev);
+                set_bit(CNIC_LCL_FL_RINGS_INITED, &cp->cnic_local_flags);
         } else if (test_bit(CNIC_F_BNX2X_CLASS, &dev->flags)) {
                 struct cnic_local *cp = dev->cnic_priv;
                 u32 cli = BNX2X_ISCSI_CL_ID(CNIC_E1HVN(cp));
@@ -4235,6 +4239,8 @@ static void cnic_init_rings(struct cnic_dev *dev)
                 cnic_init_bnx2x_tx_ring(dev);
                 cnic_init_bnx2x_rx_ring(dev);
 
+                set_bit(CNIC_LCL_FL_RINGS_INITED, &cp->cnic_local_flags);
+
                 l5_data.phy_address.lo = cli;
                 l5_data.phy_address.hi = 0;
                 cnic_submit_kwqe_16(dev, RAMROD_CMD_ID_ETH_CLIENT_SETUP,
@@ -4254,6 +4260,11 @@ static void cnic_init_rings(struct cnic_dev *dev)
 
 static void cnic_shutdown_rings(struct cnic_dev *dev)
 {
+        struct cnic_local *cp = dev->cnic_priv;
+
+        if (!test_bit(CNIC_LCL_FL_RINGS_INITED, &cp->cnic_local_flags))
+                return;
+
         if (test_bit(CNIC_F_BNX2_CLASS, &dev->flags)) {
                 cnic_shutdown_bnx2_rx_ring(dev);
         } else if (test_bit(CNIC_F_BNX2X_CLASS, &dev->flags)) {
@@ -4286,6 +4297,7 @@ static void cnic_shutdown_rings(struct cnic_dev *dev)
                         (1 << SPE_HDR_COMMON_RAMROD_SHIFT), &l5_data);
                 msleep(10);
         }
+        clear_bit(CNIC_LCL_FL_RINGS_INITED, &cp->cnic_local_flags);
 }
 
 static int cnic_register_netdev(struct cnic_dev *dev)
diff --git a/drivers/net/cnic.h b/drivers/net/cnic.h
index ef2c25e4962d..481618399b1f 100644
--- a/drivers/net/cnic.h
+++ b/drivers/net/cnic.h
@@ -192,6 +192,7 @@ struct cnic_local {
         unsigned long cnic_local_flags;
 #define CNIC_LCL_FL_KWQ_INIT            0x0
 #define CNIC_LCL_FL_L2_WAIT             0x1
+#define CNIC_LCL_FL_RINGS_INITED        0x2
 
         struct cnic_dev *dev;