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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 13/17] TSO support.
This includes both TSO-send and TSO-receive support.
Signed-off-by: Steven Smith <steven.smith@xxxxxxxxxx>
---
drivers/net/xen-netchannel2/chan.c | 3 +-
drivers/net/xen-netchannel2/netchannel2_core.h | 4 +++
drivers/net/xen-netchannel2/offload.c | 33 ++++++++++++++++++++++-
drivers/net/xen-netchannel2/recv_packet.c | 19 +++++++++++++
drivers/net/xen-netchannel2/xmit_packet.c | 8 ++++++
include/xen/interface/io/netchannel2.h | 19 ++++++++++---
6 files changed, 78 insertions(+), 8 deletions(-)
diff --git a/drivers/net/xen-netchannel2/chan.c
b/drivers/net/xen-netchannel2/chan.c
index 238e7fe..d5eb26e 100644
--- a/drivers/net/xen-netchannel2/chan.c
+++ b/drivers/net/xen-netchannel2/chan.c
@@ -568,9 +568,10 @@ void nc2_detach_rings(struct netchannel2 *nc)
nc->rings.irq = -1;
/* Disable all offloads */
- nc->net_device->features &= ~(NETIF_F_IP_CSUM | NETIF_F_SG);
+ nc->net_device->features &= ~(NETIF_F_IP_CSUM | NETIF_F_SG |
NETIF_F_TSO);
nc->allow_tx_csum_offload = 0;
nc->rings.max_fragments_per_tx_packet = 1;
+ nc->allow_tso = 0;
}
#if defined(CONFIG_XEN_NETDEV2_BACKEND)
diff --git a/drivers/net/xen-netchannel2/netchannel2_core.h
b/drivers/net/xen-netchannel2/netchannel2_core.h
index 6197550..b5aa584 100644
--- a/drivers/net/xen-netchannel2/netchannel2_core.h
+++ b/drivers/net/xen-netchannel2/netchannel2_core.h
@@ -260,6 +260,10 @@ struct netchannel2 {
Whether we actually use TX checksumming is controlled by
the net device feature bits. */
uint8_t allow_tx_csum_offload;
+ /* The remote endpoint allows us to use TSO for TCPv4. As for
+ checksumming, we only actually use the feature if the net
+ device says to. */
+ uint8_t allow_tso;
/* At some point in the past, we tried to tell the other end
what our current offload policy is and failed. Try again
as soon as possible. */
diff --git a/drivers/net/xen-netchannel2/offload.c
b/drivers/net/xen-netchannel2/offload.c
index 552b0ad..5e9c8d0 100644
--- a/drivers/net/xen-netchannel2/offload.c
+++ b/drivers/net/xen-netchannel2/offload.c
@@ -6,6 +6,7 @@
static int nc2_set_tx_csum(struct net_device *nd, u32 val);
static int nc2_set_sg(struct net_device *nd, u32 val);
+static int nc2_set_tso(struct net_device *nd, u32 val);
/* ---------------- Interface to the other domain ----------------------- */
void nc2_handle_set_offload(struct netchannel2 *nc,
@@ -35,6 +36,11 @@ void nc2_handle_set_offload(struct netchannel2 *nc,
manually enable it every time. */
nc2_set_sg(nc->net_device, msg.csum);
}
+
+ if (msg.tcpv4_segmentation_offload != nc->allow_tso) {
+ nc->allow_tso = msg.tcpv4_segmentation_offload;
+ nc2_set_tso(nc->net_device, msg.tcpv4_segmentation_offload);
+ }
}
/* Tell the other end what sort of offloads it's allowed to use. */
@@ -46,6 +52,14 @@ void advertise_offloads(struct netchannel2 *nc)
if (nc2_can_send_payload_bytes(&nc->rings.prod_ring, sizeof(msg))) {
msg.csum = nc->use_rx_csum;
+ /* We always claim to be able to accept TSO packets,
+ and don't provide any way of turning it off through
+ ethtool. We used to use the LRO flag, but that's
+ not quite right: receiving an LRO packet and
+ receiving a TSO one are subtly different, due to
+ the way they get packed into the skbuff
+ structure. */
+ msg.tcpv4_segmentation_offload = 1;
nc2_send_message(&nc->rings.prod_ring,
NETCHANNEL2_MSG_SET_OFFLOAD,
0, &msg, sizeof(msg));
@@ -142,11 +156,26 @@ static int nc2_set_sg(struct net_device *nd, u32 val)
return 0;
}
+static int nc2_set_tso(struct net_device *nd, u32 val)
+{
+ struct netchannel2 *nc = netdev_priv(nd);
+ /* We only allow ourselves to use TSO if the other end's
+ allowed us to use sufficiently many fragments per
+ packet. */
+ if (val != 0 &&
+ (!nc->allow_tso ||
+ nc->rings.max_fragments_per_tx_packet < MAX_SKB_FRAGS))
+ return -EOPNOTSUPP;
+ return ethtool_op_set_tso(nd, val);
+}
+
struct ethtool_ops nc2_ethtool_ops = {
.get_tx_csum = ethtool_op_get_tx_csum,
.set_tx_csum = nc2_set_tx_csum,
.get_rx_csum = nc2_get_rx_csum,
.set_rx_csum = nc2_set_rx_csum,
- .get_sg = ethtool_op_get_sg,
- .set_sg = nc2_set_sg,
+ .get_sg = ethtool_op_get_sg,
+ .set_sg = nc2_set_sg,
+ .get_tso = ethtool_op_get_tso,
+ .set_tso = nc2_set_tso
};
diff --git a/drivers/net/xen-netchannel2/recv_packet.c
b/drivers/net/xen-netchannel2/recv_packet.c
index 958a3a6..80c5d5d 100644
--- a/drivers/net/xen-netchannel2/recv_packet.c
+++ b/drivers/net/xen-netchannel2/recv_packet.c
@@ -169,6 +169,25 @@ void nc2_handle_packet_msg(struct netchannel2 *nc,
break;
}
+ switch (msg.segmentation_type) {
+ case NC2_PACKET_SEGMENTATION_TYPE_none:
+ break;
+ case NC2_PACKET_SEGMENTATION_TYPE_tcpv4:
+ if (msg.mss == 0) {
+ pr_debug("TSO request with mss == 0?\n");
+ goto err;
+ }
+ skb_shinfo(skb)->gso_type =
+ SKB_GSO_TCPV4 | SKB_GSO_DODGY;
+ skb_shinfo(skb)->gso_size = msg.mss;
+ skb_shinfo(skb)->gso_segs = 0;
+ break;
+ default:
+ pr_debug("Unknown segmentation offload type %d!\n",
+ msg.segmentation_type);
+ goto err;
+ }
+
__skb_queue_tail(pending_rx_queue, skb);
if (ncrp->pending_rx_hypercalls.nr_pending_gops >=
diff --git a/drivers/net/xen-netchannel2/xmit_packet.c
b/drivers/net/xen-netchannel2/xmit_packet.c
index a3304f2..4c9e0b5 100644
--- a/drivers/net/xen-netchannel2/xmit_packet.c
+++ b/drivers/net/xen-netchannel2/xmit_packet.c
@@ -102,6 +102,14 @@ static void set_offload_flags(struct sk_buff *skb,
msg->csum_offset = msg->csum_start + skb->csum_offset;
} else if (skb->ip_summed == CHECKSUM_UNNECESSARY)
msg->flags |= NC2_PACKET_FLAG_data_validated;
+
+ if (skb_shinfo(skb)->gso_size != 0) {
+ msg->mss = skb_shinfo(skb)->gso_size;
+ msg->segmentation_type = NC2_PACKET_SEGMENTATION_TYPE_tcpv4;
+ } else {
+ msg->mss = 0;
+ msg->segmentation_type = NC2_PACKET_SEGMENTATION_TYPE_none;
+ }
}
/* Transmit a packet which has previously been prepared with
diff --git a/include/xen/interface/io/netchannel2.h
b/include/xen/interface/io/netchannel2.h
index 11bb469..1cca607 100644
--- a/include/xen/interface/io/netchannel2.h
+++ b/include/xen/interface/io/netchannel2.h
@@ -54,13 +54,13 @@ struct netchannel2_msg_packet {
packet message. */
uint8_t type;
uint8_t flags;
- uint8_t pad0;
- uint8_t pad1;
+ uint8_t segmentation_type;
+ uint8_t pad;
uint16_t prefix_size;
- uint16_t pad2;
+ uint16_t mss;
uint16_t csum_start;
uint16_t csum_offset;
- /* Variable-size array. The number of elements is determined
+ /* Variable-size array. The number of elements is determined
by the size of the message. */
struct netchannel2_fragment frags[0];
};
@@ -112,6 +112,9 @@ struct netchannel2_msg_packet {
#define NC2_PACKET_TYPE_receiver_copy 1
#define NC2_PACKET_TYPE_small 4
+#define NC2_PACKET_SEGMENTATION_TYPE_none 0
+#define NC2_PACKET_SEGMENTATION_TYPE_tcpv4 1
+
/* Tell the other end that we're finished with a message it sent us,
and it can release the transmit buffers etc. This must be sent in
response to receiver_copy and receiver_map packets. It must not be
@@ -140,7 +143,13 @@ struct netchannel2_msg_set_offload {
* the other end does not have to perform the calculation.
*/
uint8_t csum;
- uint8_t pad;
+ /* Segmentation offload. If this is 0, the other end must not
+ * generate any packet messages with a segmentation type other
+ * than NC2_PACKET_SEGMENTATION_TYPE_none. If it is 1, the
+ * other end may also generate packets with a type of
+ * NC2_PACKET_SEGMENTATION_TYPE_tcpv4.
+ */
+ uint8_t tcpv4_segmentation_offload;
uint16_t reserved;
};
--
1.6.3.1
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