IPoIB/cm: Drain cq in ipoib_cm_dev_stop()

Since NAPI polling is disabled while ipoib_cm_dev_stop() is running,
ipoib_cm_dev_stop() must poll the CQ itself in order to see the
packets draining.

Signed-off-by: Michael S. Tsirkin <mst@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

3 files changed, 21 insertions, 12 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index a0b3782c762..158759e28a5 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -429,6 +429,7 @@ int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey);
 
 void ipoib_pkey_poll(struct work_struct *work);
 int ipoib_pkey_dev_delay_open(struct net_device *dev);
+void ipoib_drain_cq(struct net_device *dev);
 
 #ifdef CONFIG_INFINIBAND_IPOIB_CM
 
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
index e8fcd628be7..f133b56fd97 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_cm.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
@@ -726,6 +726,7 @@ void ipoib_cm_dev_stop(struct net_device *dev)
                 }
                 spin_unlock_irq(&priv->lock);
                 msleep(1);
+                ipoib_drain_cq(dev);
                 spin_lock_irq(&priv->lock);
         }
 
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index c1aad06eb4e..8404f05b2b6 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -550,13 +550,30 @@ static int recvs_pending(struct net_device *dev)
         return pending;
 }
 
+void ipoib_drain_cq(struct net_device *dev)
+{
+        struct ipoib_dev_priv *priv = netdev_priv(dev);
+        int i, n;
+        do {
+                n = ib_poll_cq(priv->cq, IPOIB_NUM_WC, priv->ibwc);
+                for (i = 0; i < n; ++i) {
+                        if (priv->ibwc[i].wr_id & IPOIB_CM_OP_SRQ)
+                                ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
+                        else if (priv->ibwc[i].wr_id & IPOIB_OP_RECV)
+                                ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
+                        else
+                                ipoib_ib_handle_tx_wc(dev, priv->ibwc + i);
+                }
+        } while (n == IPOIB_NUM_WC);
+}
+
 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
 {
         struct ipoib_dev_priv *priv = netdev_priv(dev);
         struct ib_qp_attr qp_attr;
         unsigned long begin;
         struct ipoib_tx_buf *tx_req;
-        int i, n;
+        int i;
 
         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
         netif_poll_disable(dev);
@@ -611,17 +628,7 @@ int ipoib_ib_dev_stop(struct net_device *dev, int flush)
                         goto timeout;
                 }
 
-                do {
-                        n = ib_poll_cq(priv->cq, IPOIB_NUM_WC, priv->ibwc);
-                        for (i = 0; i < n; ++i) {
-                                if (priv->ibwc[i].wr_id & IPOIB_CM_OP_SRQ)
-                                        ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
-                                else if (priv->ibwc[i].wr_id & IPOIB_OP_RECV)
-                                        ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
-                                else
-                                        ipoib_ib_handle_tx_wc(dev, priv->ibwc + i);
-                        }
-                } while (n == IPOIB_NUM_WC);
+                ipoib_drain_cq(dev);
 
                 msleep(1);
         }