Hi:
[NET] front: Transmit TSO packets if supported
This patch adds TSO transmission support to the frontend.
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
--
diff -r 9853b45712e8 -r 9f4e79081e4a 
linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c
--- a/linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c Wed Jun 28 
13:55:13 2006 +1000
+++ b/linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c Wed Jun 28 
13:55:32 2006 +1000
@@ -463,7 +463,7 @@ static int network_open(struct net_devic
 
 static inline int netfront_tx_slot_available(struct netfront_info *np)
 {
- return RING_FREE_REQUESTS(&np->tx) >= MAX_SKB_FRAGS + 1;
+ return RING_FREE_REQUESTS(&np->tx) >= MAX_SKB_FRAGS + 2;
 }
 
 static inline void network_maybe_wake_tx(struct net_device *dev)
@@ -491,7 +491,13 @@ static void network_tx_buf_gc(struct net
 rmb(); /* Ensure we see responses up to 'rp'. */
 
 for (cons = np->tx.rsp_cons; cons != prod; cons++) {
- id = RING_GET_RESPONSE(&np->tx, cons)->id;
+ struct netif_tx_response *txrsp;
+
+ txrsp = RING_GET_RESPONSE(&np->tx, cons);
+ if (txrsp->status == NETIF_RSP_NULL)
+ continue;
+
+ id = txrsp->id;
 skb = np->tx_skbs[id];
 if (unlikely(gnttab_query_foreign_access(
 np->grant_tx_ref[id]) != 0)) {
@@ -739,7 +745,8 @@ static int network_start_xmit(struct sk_
 spin_lock_irq(&np->tx_lock);
 
 if (unlikely(!netif_carrier_ok(dev) ||
- (frags > 1 && !xennet_can_sg(dev)))) {
+ (frags > 1 && !xennet_can_sg(dev)) ||
+ netif_needs_gso(dev, skb))) {
 spin_unlock_irq(&np->tx_lock);
 goto drop;
 }
@@ -762,9 +769,21 @@ static int network_start_xmit(struct sk_
 tx->size = len;
 
 tx->flags = 0;
- if (skb->ip_summed == CHECKSUM_HW) /* local packet? */
+ if (skb->ip_summed == CHECKSUM_HW) {
+ /* local packet? */
 tx->flags |= NETTXF_csum_blank | NETTXF_data_validated;
- if (skb->proto_data_valid) /* remote but checksummed? */
+
+ if (skb_shinfo(skb)->gso_size) {
+ struct netif_tx_extra *txtra =
+ (struct netif_tx_extra *)
+ RING_GET_REQUEST(&np->tx, ++i);
+
+ tx->flags |= NETTXF_gso;
+ txtra->gso_size = skb_shinfo(skb)->gso_size;
+ txtra->gso_segs = skb_shinfo(skb)->gso_segs;
+ txtra->gso_type = skb_shinfo(skb)->gso_type;
+ }
+ } else if (skb->proto_data_valid) /* remote but checksummed? */
 tx->flags |= NETTXF_data_validated;
 
 np->tx.req_prod_pvt = i + 1;
@@ -1065,9 +1084,26 @@ static int xennet_set_sg(struct net_devi
 return ethtool_op_set_sg(dev, data);
 }
 
+static int xennet_set_tso(struct net_device *dev, u32 data)
+{
+ if (data) {
+ struct netfront_info *np = netdev_priv(dev);
+ int val;
+
+ if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-tso",
+ "%d", &val) < 0)
+ val = 0;
+ if (!val)
+ return -ENOSYS;
+ }
+
+ return ethtool_op_set_tso(dev, data);
+}
+
 static void xennet_set_features(struct net_device *dev)
 {
- xennet_set_sg(dev, 1);
+ if (!xennet_set_sg(dev, 1))
+ xennet_set_tso(dev, 1);
 }
 
 static void network_connect(struct net_device *dev)
@@ -1148,6 +1184,8 @@ static struct ethtool_ops network_ethtoo
 .set_tx_csum = ethtool_op_set_tx_csum,
 .get_sg = ethtool_op_get_sg,
 .set_sg = xennet_set_sg,
+ .get_tso = ethtool_op_get_tso,
+ .set_tso = xennet_set_tso,
 };
 
 #ifdef CONFIG_SYSFS
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