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authorKY Srinivasan <kys@microsoft.com>2014-04-09 15:00:47 -0700
committerDavid S. Miller <davem@davemloft.net>2014-04-11 15:15:12 -0400
commitaf9893a3dc790ae0c4d3e68adde12bc3cb9c63fa (patch)
tree7a95879de0f7b22181a67c2e7e23e7407d97b529
parent1f73db495aaa0f1eb4de84856d9ea46711898c08 (diff)
Drivers: net: hyperv: Address UDP checksum issues
ws2008r2 does not support UDP checksum offload. Thus, we cannnot turn on UDP offload in the host. Also, on ws2012 and ws2012 r2, there appear to be an issue with UDP checksum offload. Fix this issue by computing the UDP checksum in the Hyper-V driver. Based on Dave Miller's comments, in this version, I have COWed the skb before modifying the UDP header (the checksum field). Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/hyperv/hyperv_net.h1
-rw-r--r--drivers/net/hyperv/netvsc_drv.c26
-rw-r--r--drivers/net/hyperv/rndis_filter.c12
3 files changed, 37 insertions, 2 deletions
diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index 13010b4dae5b..d18f711d0b0c 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -747,6 +747,7 @@ struct ndis_oject_header {
#define NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4 0
#define NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6 1
+#define VERSION_4_OFFLOAD_SIZE 22
/*
* New offload OIDs for NDIS 6
*/
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 6f39baa67a5f..31e55fba7cad 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -398,7 +398,30 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
csum_info->transmit.tcp_checksum = 1;
csum_info->transmit.tcp_header_offset = hdr_offset;
} else if (net_trans_info & INFO_UDP) {
- csum_info->transmit.udp_checksum = 1;
+ /* UDP checksum offload is not supported on ws2008r2.
+ * Furthermore, on ws2012 and ws2012r2, there are some
+ * issues with udp checksum offload from Linux guests.
+ * (these are host issues).
+ * For now compute the checksum here.
+ */
+ struct udphdr *uh;
+ u16 udp_len;
+
+ ret = skb_cow_head(skb, 0);
+ if (ret)
+ goto drop;
+
+ uh = udp_hdr(skb);
+ udp_len = ntohs(uh->len);
+ uh->check = 0;
+ uh->check = csum_tcpudp_magic(ip_hdr(skb)->saddr,
+ ip_hdr(skb)->daddr,
+ udp_len, IPPROTO_UDP,
+ csum_partial(uh, udp_len, 0));
+ if (uh->check == 0)
+ uh->check = CSUM_MANGLED_0;
+
+ csum_info->transmit.udp_checksum = 0;
}
goto do_send;
@@ -438,6 +461,7 @@ do_send:
ret = netvsc_send(net_device_ctx->device_ctx, packet);
+drop:
if (ret == 0) {
net->stats.tx_bytes += skb->len;
net->stats.tx_packets++;
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index 4a37e3db9e32..143a98caf618 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -641,6 +641,16 @@ int rndis_filter_set_offload_params(struct hv_device *hdev,
struct rndis_set_complete *set_complete;
u32 extlen = sizeof(struct ndis_offload_params);
int ret, t;
+ u32 vsp_version = nvdev->nvsp_version;
+
+ if (vsp_version <= NVSP_PROTOCOL_VERSION_4) {
+ extlen = VERSION_4_OFFLOAD_SIZE;
+ /* On NVSP_PROTOCOL_VERSION_4 and below, we do not support
+ * UDP checksum offload.
+ */
+ req_offloads->udp_ip_v4_csum = 0;
+ req_offloads->udp_ip_v6_csum = 0;
+ }
request = get_rndis_request(rdev, RNDIS_MSG_SET,
RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
@@ -674,7 +684,7 @@ int rndis_filter_set_offload_params(struct hv_device *hdev,
} else {
set_complete = &request->response_msg.msg.set_complete;
if (set_complete->status != RNDIS_STATUS_SUCCESS) {
- netdev_err(ndev, "Fail to set MAC on host side:0x%x\n",
+ netdev_err(ndev, "Fail to set offload on host side:0x%x\n",
set_complete->status);
ret = -EINVAL;
}