IPoIB: Use checksum offload support if available

For HCAs that support checksum offload (ie that set IB_DEVICE_UD_IP_CSUM
in the device capabilities flags), have IPoIB set NETIF_F_IP_CSUM and
use the HCA to generate and verify IP checksums.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 23 insertions, 1 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 57282048865..329b4675aec 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -1105,6 +1105,7 @@ static struct net_device *ipoib_add_port(const char *format,
                                          struct ib_device *hca, u8 port)
 {
         struct ipoib_dev_priv *priv;
+        struct ib_device_attr *device_attr;
         int result = -ENOMEM;
 
         priv = ipoib_intf_alloc(format);
@@ -1120,6 +1121,28 @@ static struct net_device *ipoib_add_port(const char *format,
                 goto device_init_failed;
         }
 
+        device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
+        if (!device_attr) {
+                printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
+                       hca->name, sizeof *device_attr);
+                goto device_init_failed;
+        }
+
+        result = ib_query_device(hca, device_attr);
+        if (result) {
+                printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
+                       hca->name, result);
+                kfree(device_attr);
+                goto device_init_failed;
+        }
+
+        if (device_attr->device_cap_flags & IB_DEVICE_UD_IP_CSUM) {
+                set_bit(IPOIB_FLAG_CSUM, &priv->flags);
+                priv->dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
+        }
+
+        kfree(device_attr);
+
         /*
          * Set the full membership bit, so that we join the right
          * broadcast group, etc.
@@ -1137,7 +1160,6 @@ static struct net_device *ipoib_add_port(const char *format,
         } else
                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 
-
         result = ipoib_dev_init(priv->dev, hca, port);
         if (result < 0) {
                 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",