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Message-ID: <1376378913-879-2-git-send-email-hayeswang@realtek.com>
Date: Tue, 13 Aug 2013 15:28:32 +0800
From: Hayes Wang <hayeswang@...ltek.com>
To: <netdev@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
Hayes Wang <hayeswang@...ltek.com>
Subject: [PATCH net-next 2/3] net/usb/r8152: enable tx checksum
Enable tx checksum.
Signed-off-by: Hayes Wang <hayeswang@...ltek.com>
---
drivers/net/usb/r8152.c | 63 +++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 58 insertions(+), 5 deletions(-)
diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index c6c5aa2..5d9d949 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -20,6 +20,8 @@
#include <linux/if_vlan.h>
#include <linux/uaccess.h>
#include <linux/list.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
/* Version Information */
#define DRIVER_VERSION "v1.01.0 (2013/08/12)"
@@ -314,8 +316,13 @@ struct tx_desc {
u32 opts1;
#define TX_FS (1 << 31) /* First segment of a packet */
#define TX_LS (1 << 30) /* Final segment of a packet */
-#define TX_LEN_MASK 0xffff
+#define TX_LEN_MASK 0x3ffff
+
u32 opts2;
+#define UDP_CS (1 << 31) /* Calculate UDP/IP checksum */
+#define TCP_CS (1 << 30) /* Calculate TCP/IP checksum */
+#define IPV4_CS (1 << 29) /* Calculate IPv4 checksum */
+#define IPV6_CS (1 << 28) /* Calculate IPv6 checksum */
};
struct rx_agg {
@@ -964,6 +971,51 @@ err1:
return -ENOMEM;
}
+static void
+r8152_tx_csum(struct r8152 *tp, struct tx_desc *desc, struct sk_buff *skb)
+{
+ memset(desc, 0, sizeof(*desc));
+
+ desc->opts1 = cpu_to_le32((skb->len & TX_LEN_MASK) | TX_FS | TX_LS);
+
+ if (skb->ip_summed == CHECKSUM_PARTIAL) {
+ __be16 protocol;
+ u8 ip_protocol;
+ u32 opts2 = 0;
+
+ if (skb->protocol == htons(ETH_P_8021Q))
+ protocol = vlan_eth_hdr(skb)->h_vlan_encapsulated_proto;
+ else
+ protocol = skb->protocol;
+
+ switch (protocol) {
+ case htons(ETH_P_IP):
+ opts2 |= IPV4_CS;
+ ip_protocol = ip_hdr(skb)->protocol;
+ break;
+
+ case htons(ETH_P_IPV6):
+ opts2 |= IPV6_CS;
+ ip_protocol = ipv6_hdr(skb)->nexthdr;
+ break;
+
+ default:
+ ip_protocol = IPPROTO_RAW;
+ break;
+ }
+
+ if (ip_protocol == IPPROTO_TCP) {
+ opts2 |= TCP_CS;
+ opts2 |= (skb_transport_offset(skb) & 0x7fff) << 17;
+ } else if (ip_protocol == IPPROTO_UDP) {
+ opts2 |= UDP_CS;
+ } else
+ WARN_ON_ONCE(1);
+
+ desc->opts2 = cpu_to_le32(opts2);
+ }
+}
+
static void rx_bottom(struct r8152 *tp)
{
struct net_device_stats *stats;
@@ -1100,8 +1152,7 @@ next_agg:
tx_desc = (struct tx_desc *)agg->data;
agg->data += sizeof(*tx_desc);
- tx_desc->opts1 = cpu_to_le32((skb->len & TX_LEN_MASK) | TX_FS |
- TX_LS);
+ r8152_tx_csum(tp, tx_desc, skb);
memcpy(agg->data, skb->data, len);
agg->skb_num++;
agg->skb_len += len;
@@ -1249,7 +1300,7 @@ static netdev_tx_t rtl8152_start_xmit(struct sk_buff *skb,
agg->skb_num = agg->skb_len = 0;
len = skb->len;
- tx_desc->opts1 = cpu_to_le32((skb->len & TX_LEN_MASK) | TX_FS | TX_LS);
+ r8152_tx_csum(tp, tx_desc, skb);
memcpy(agg->data, skb->data, len);
dev_kfree_skb_any(skb);
agg->skb_num++;
@@ -1957,7 +2008,9 @@ static int rtl8152_probe(struct usb_interface *intf,
tp->netdev = netdev;
netdev->netdev_ops = &rtl8152_netdev_ops;
netdev->watchdog_timeo = RTL8152_TX_TIMEOUT;
- netdev->features &= ~NETIF_F_IP_CSUM;
+
+ netdev->features |= NETIF_F_IP_CSUM;
+ netdev->hw_features = NETIF_F_IP_CSUM;
SET_ETHTOOL_OPS(netdev, &ops);
tp->speed = 0;
--
1.8.3.1
--
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