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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>
This commit is contained in:
Eli Cohen 2008-04-16 21:01:10 -07:00 committed by Roland Dreier
parent 3371836383
commit 6046136c74
4 changed files with 41 additions and 1 deletions
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1
drivers/infiniband/ulp/ipoib/ipoib.h
View File

@ -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,

8
drivers/infiniband/ulp/ipoib/ipoib_cm.c
View File

@ -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;
}

9
drivers/infiniband/ulp/ipoib/ipoib_ib.c
View File

@ -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),

24
drivers/infiniband/ulp/ipoib/ipoib_main.c
View File

@ -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",