IPoIB: Allocate priv->tx_ring with vmalloc()

Commit 7143740d ("IPoIB: Add send gather support") made struct
ipoib_tx_buf significantly larger, since the mapping member changed
from a single u64 to an array with MAX_SKB_FRAGS + 1 entries.  This
means that allocating tx_rings with kzalloc() may fail because there
is not enough contiguous memory for the new, much bigger size.  Fix
this regression by allocating the rings with vmalloc() instead.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

2 files changed, 10 insertions, 7 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
index 4e8d0281f8bc..2490b2d79dbb 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_cm.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
@@ -38,6 +38,7 @@
 #include <net/icmp.h>
 #include <linux/icmpv6.h>
 #include <linux/delay.h>
+#include <linux/vmalloc.h>
 
 #include "ipoib.h"
 
@@ -1031,13 +1032,13 @@ static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
         int ret;
 
-        p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring,
-                                GFP_KERNEL);
+        p->tx_ring = vmalloc(ipoib_sendq_size * sizeof *p->tx_ring);
         if (!p->tx_ring) {
                 ipoib_warn(priv, "failed to allocate tx ring\n");
                 ret = -ENOMEM;
                 goto err_tx;
         }
+        memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
 
         p->qp = ipoib_cm_create_tx_qp(p->dev, p);
         if (IS_ERR(p->qp)) {
@@ -1078,6 +1079,7 @@ err_id:
         ib_destroy_qp(p->qp);
 err_qp:
         p->qp = NULL;
+        vfree(p->tx_ring);
 err_tx:
         return ret;
 }
@@ -1128,7 +1130,7 @@ timeout:
         if (p->qp)
                 ib_destroy_qp(p->qp);
 
-        kfree(p->tx_ring);
+        vfree(p->tx_ring);
         kfree(p);
 }
 
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index f96477a8ca5a..57282048865c 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -41,6 +41,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/kernel.h>
+#include <linux/vmalloc.h>
 
 #include <linux/if_arp.h>       /* For ARPHRD_xxx */
 
@@ -887,13 +888,13 @@ int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
                 goto out;
         }
 
-        priv->tx_ring = kzalloc(ipoib_sendq_size * sizeof *priv->tx_ring,
-                                GFP_KERNEL);
+        priv->tx_ring = vmalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
         if (!priv->tx_ring) {
                 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
                        ca->name, ipoib_sendq_size);
                 goto out_rx_ring_cleanup;
         }
+        memset(priv->tx_ring, 0, ipoib_sendq_size * sizeof *priv->tx_ring);
 
         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
 
@@ -903,7 +904,7 @@ int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
         return 0;
 
 out_tx_ring_cleanup:
-        kfree(priv->tx_ring);
+        vfree(priv->tx_ring);
 
 out_rx_ring_cleanup:
         kfree(priv->rx_ring);
@@ -928,7 +929,7 @@ void ipoib_dev_cleanup(struct net_device *dev)
         ipoib_ib_dev_cleanup(dev);
 
         kfree(priv->rx_ring);
-        kfree(priv->tx_ring);
+        vfree(priv->tx_ring);
 
         priv->rx_ring = NULL;
         priv->tx_ring = NULL;