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>

diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index 054fab8..08930ca 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -87,6 +87,7 @@ enum {
        IPOIB_MCAST_STARTED       = 8,
        IPOIB_FLAG_ADMIN_CM       = 9,
        IPOIB_FLAG_UMCAST         = 10,
+       IPOIB_FLAG_CSUM           = 11,
 
        IPOIB_MAX_BACKOFF_SECONDS = 16,
 

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
index 2490b2d..edf63dc 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_cm.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
@@ -1383,6 +1383,10 @@ static ssize_t set_mode(struct device *d, struct device_attribute *attr,
                set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
                ipoib_warn(priv, "enabling connected mode "
                           "will cause multicast packet drops\n");
+
+               dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_SG);
+               priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
+
                ipoib_flush_paths(dev);
                return count;
        }
@@ -1391,6 +1395,10 @@ static ssize_t set_mode(struct device *d, struct device_attribute *attr,
                clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
                dev->mtu = min(priv->mcast_mtu, dev->mtu);
                ipoib_flush_paths(dev);
+
+               if (test_bit(IPOIB_FLAG_CSUM, &priv->flags))
+                       dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
+
                return count;
        }
 

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index 08c4396..d13f4fb 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -231,6 +231,10 @@ static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
        skb->dev = dev;
        /* XXX get correct PACKET_ type here */
        skb->pkt_type = PACKET_HOST;
+
+       if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok))
+               skb->ip_summed = CHECKSUM_UNNECESSARY;
+
        netif_receive_skb(skb);
 
 repost:
@@ -442,6 +446,11 @@ void ipoib_send(struct net_device *dev, struct sk_buff *skb,
                return;
        }
 
+       if (skb->ip_summed == CHECKSUM_PARTIAL)
+               priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
+       else
+               priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
+
        if (unlikely(post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
                               address->ah, qpn,
                               tx_req->mapping, skb_headlen(skb),

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 5728204..329b467 100644 (file)
--- 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",