netxen: fix ipv6 offload and tx cleanup

o fix the ip/tcp hdr offset in tx descriptors for ipv6.
o cleanup xmit function, move the tso checks into separate function,
  this reduces unnecessary endian conversions back and forth.
o optimize macros to initialize tx descriptors.

Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 57 insertions, 91 deletions

diff --git a/drivers/net/netxen/netxen_nic.h b/drivers/net/netxen/netxen_nic.h
index 31311cc66d18..acb2ac971ca3 100644
--- a/drivers/net/netxen/netxen_nic.h
+++ b/drivers/net/netxen/netxen_nic.h
@@ -308,27 +308,16 @@ struct netxen_ring_ctx {
 #define netxen_set_cmd_desc_ctxid(cmd_desc, var)        \
         ((cmd_desc)->port_ctxid |= ((var) << 4 & 0xF0))
 
-#define netxen_set_cmd_desc_flags(cmd_desc, val)        \
-        (cmd_desc)->flags_opcode = ((cmd_desc)->flags_opcode & \
-                ~cpu_to_le16(0x7f)) | cpu_to_le16((val) & 0x7f)
-#define netxen_set_cmd_desc_opcode(cmd_desc, val)       \
-        (cmd_desc)->flags_opcode = ((cmd_desc)->flags_opcode & \
-                ~cpu_to_le16((u16)0x3f << 7)) | cpu_to_le16(((val) & 0x3f) << 7)
-
-#define netxen_set_cmd_desc_num_of_buff(cmd_desc, val)  \
-        (cmd_desc)->num_of_buffers_total_length = \
-                ((cmd_desc)->num_of_buffers_total_length & \
-                ~cpu_to_le32(0xff)) | cpu_to_le32((val) & 0xff)
-#define netxen_set_cmd_desc_totallength(cmd_desc, val)  \
-        (cmd_desc)->num_of_buffers_total_length = \
-                ((cmd_desc)->num_of_buffers_total_length & \
-                ~cpu_to_le32((u32)0xffffff << 8)) | \
-                cpu_to_le32(((val) & 0xffffff) << 8)
-
-#define netxen_get_cmd_desc_opcode(cmd_desc)    \
-        ((le16_to_cpu((cmd_desc)->flags_opcode) >> 7) & 0x003f)
-#define netxen_get_cmd_desc_totallength(cmd_desc)       \
-        ((le32_to_cpu((cmd_desc)->num_of_buffers_total_length) >> 8) & 0xffffff)
+#define netxen_set_tx_port(_desc, _port) \
+        (_desc)->port_ctxid = ((_port) & 0xf) | (((_port) << 4) & 0xf0)
+
+#define netxen_set_tx_flags_opcode(_desc, _flags, _opcode) \
+        (_desc)->flags_opcode = \
+        cpu_to_le16(((_flags) & 0x7f) | (((_opcode) & 0x3f) << 7))
+
+#define netxen_set_tx_frags_len(_desc, _frags, _len) \
+        (_desc)->num_of_buffers_total_length = \
+        cpu_to_le32(((_frags) & 0xff) | (((_len) & 0xffffff) << 8))
 
 struct cmd_desc_type0 {
         u8 tcp_hdr_offset;      /* For LSO only */
@@ -757,7 +746,7 @@ extern char netxen_nic_driver_name[];
  */
 struct netxen_skb_frag {
         u64 dma;
-        u32 length;
+        ulong length;
 };
 
 #define _netxen_set_bits(config_word, start, bits, val) {\
@@ -783,13 +772,7 @@ struct netxen_skb_frag {
 struct netxen_cmd_buffer {
         struct sk_buff *skb;
         struct netxen_skb_frag frag_array[MAX_BUFFERS_PER_CMD + 1];
-        u32 total_length;
-        u32 mss;
-        u16 port;
-        u8 cmd;
-        u8 frag_count;
-        unsigned long time_stamp;
-        u32 state;
+        u32 frag_count;
 };
 
 /* In rx_buffer, we do not need multiple fragments as is a single buffer */
@@ -1486,8 +1469,6 @@ void netxen_release_tx_buffers(struct netxen_adapter *adapter);
 
 void netxen_initialize_adapter_ops(struct netxen_adapter *adapter);
 int netxen_init_firmware(struct netxen_adapter *adapter);
-void netxen_tso_check(struct netxen_adapter *adapter,
-                      struct cmd_desc_type0 *desc, struct sk_buff *skb);
 void netxen_nic_clear_stats(struct netxen_adapter *adapter);
 void netxen_watchdog_task(struct work_struct *work);
 void netxen_post_rx_buffers(struct netxen_adapter *adapter, u32 ctx,
diff --git a/drivers/net/netxen/netxen_nic_hw.c b/drivers/net/netxen/netxen_nic_hw.c
index e8a0eed0078e..98d0bcda5f4f 100644
--- a/drivers/net/netxen/netxen_nic_hw.c
+++ b/drivers/net/netxen/netxen_nic_hw.c
@@ -508,12 +508,8 @@ netxen_send_cmd_descs(struct netxen_adapter *adapter,
                 cmd_desc = &cmd_desc_arr[i];
 
                 pbuf = &adapter->cmd_buf_arr[producer];
-                pbuf->mss = 0;
-                pbuf->total_length = 0;
                 pbuf->skb = NULL;
-                pbuf->cmd = 0;
                 pbuf->frag_count = 0;
-                pbuf->port = 0;
 
                 /* adapter->ahw.cmd_desc_head[producer] = *cmd_desc; */
                 memcpy(&adapter->ahw.cmd_desc_head[producer],
diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
index ba01524b5531..cb3912381802 100644
--- a/drivers/net/netxen/netxen_nic_main.c
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -39,6 +39,7 @@
 #include "netxen_nic_phan_reg.h"
 
 #include <linux/dma-mapping.h>
+#include <linux/if_vlan.h>
 #include <net/ip.h>
 
 MODULE_DESCRIPTION("NetXen Multi port (1/10) Gigabit Network Driver");
@@ -1137,29 +1138,46 @@ static int netxen_nic_close(struct net_device *netdev)
         return 0;
 }
 
-void netxen_tso_check(struct netxen_adapter *adapter,
+static bool netxen_tso_check(struct net_device *netdev,
                       struct cmd_desc_type0 *desc, struct sk_buff *skb)
 {
-        if (desc->mss) {
-                desc->total_hdr_length = (sizeof(struct ethhdr) +
-                                          ip_hdrlen(skb) + tcp_hdrlen(skb));
+        bool tso = false;
+        u8 opcode = TX_ETHER_PKT;
 
-                if ((NX_IS_REVISION_P3(adapter->ahw.revision_id)) &&
-                                (skb->protocol == htons(ETH_P_IPV6)))
-                        netxen_set_cmd_desc_opcode(desc, TX_TCP_LSO6);
-                else
-                        netxen_set_cmd_desc_opcode(desc, TX_TCP_LSO);
+        if ((netdev->features & (NETIF_F_TSO | NETIF_F_TSO6)) &&
+                        skb_shinfo(skb)->gso_size > 0) {
+
+                desc->mss = cpu_to_le16(skb_shinfo(skb)->gso_size);
+                desc->total_hdr_length =
+                        skb_transport_offset(skb) + tcp_hdrlen(skb);
+
+                opcode = (skb->protocol == htons(ETH_P_IPV6)) ?
+                                TX_TCP_LSO6 : TX_TCP_LSO;
+                tso = true;
 
         } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
-                if (ip_hdr(skb)->protocol == IPPROTO_TCP)
-                        netxen_set_cmd_desc_opcode(desc, TX_TCP_PKT);
-                else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
-                        netxen_set_cmd_desc_opcode(desc, TX_UDP_PKT);
-                else
-                        return;
+                u8 l4proto;
+
+                if (skb->protocol == htons(ETH_P_IP)) {
+                        l4proto = ip_hdr(skb)->protocol;
+
+                        if (l4proto == IPPROTO_TCP)
+                                opcode = TX_TCP_PKT;
+                        else if(l4proto == IPPROTO_UDP)
+                                opcode = TX_UDP_PKT;
+                } else if (skb->protocol == htons(ETH_P_IPV6)) {
+                        l4proto = ipv6_hdr(skb)->nexthdr;
+
+                        if (l4proto == IPPROTO_TCP)
+                                opcode = TX_TCPV6_PKT;
+                        else if(l4proto == IPPROTO_UDP)
+                                opcode = TX_UDPV6_PKT;
+                }
         }
         desc->tcp_hdr_offset = skb_transport_offset(skb);
         desc->ip_hdr_offset = skb_network_offset(skb);
+        netxen_set_tx_flags_opcode(desc, 0, opcode);
+        return tso;
 }
 
 static int netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
@@ -1167,33 +1185,20 @@ static int netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
         struct netxen_adapter *adapter = netdev_priv(netdev);
         struct netxen_hardware_context *hw = &adapter->ahw;
         unsigned int first_seg_len = skb->len - skb->data_len;
+        struct netxen_cmd_buffer *pbuf;
         struct netxen_skb_frag *buffrag;
-        unsigned int i;
+        struct cmd_desc_type0 *hwdesc;
+        int i, k;
 
         u32 producer, consumer;
-        u32 saved_producer = 0;
-        struct cmd_desc_type0 *hwdesc;
-        int k;
-        struct netxen_cmd_buffer *pbuf = NULL;
-        int frag_count;
-        int no_of_desc;
+        int frag_count, no_of_desc;
         u32 num_txd = adapter->max_tx_desc_count;
+        bool is_tso = false;
 
         frag_count = skb_shinfo(skb)->nr_frags + 1;
 
         /* There 4 fragments per descriptor */
         no_of_desc = (frag_count + 3) >> 2;
-        if (netdev->features & (NETIF_F_TSO | NETIF_F_TSO6)) {
-                if (skb_shinfo(skb)->gso_size > 0) {
-
-                        no_of_desc++;
-                        if ((ip_hdrlen(skb) + tcp_hdrlen(skb) +
-                             sizeof(struct ethhdr)) >
-                            (sizeof(struct cmd_desc_type0) - 2)) {
-                                no_of_desc++;
-                        }
-                }
-        }
 
         producer = adapter->cmd_producer;
         smp_mb();
@@ -1205,34 +1210,22 @@ static int netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
         }
 
         /* Copy the descriptors into the hardware    */
-        saved_producer = producer;
         hwdesc = &hw->cmd_desc_head[producer];
         memset(hwdesc, 0, sizeof(struct cmd_desc_type0));
         /* Take skb->data itself */
         pbuf = &adapter->cmd_buf_arr[producer];
-        if ((netdev->features & (NETIF_F_TSO | NETIF_F_TSO6)) &&
-                        skb_shinfo(skb)->gso_size > 0) {
-                pbuf->mss = skb_shinfo(skb)->gso_size;
-                hwdesc->mss = cpu_to_le16(skb_shinfo(skb)->gso_size);
-        } else {
-                pbuf->mss = 0;
-                hwdesc->mss = 0;
-        }
-        pbuf->total_length = skb->len;
+
+        is_tso = netxen_tso_check(netdev, hwdesc, skb);
+
         pbuf->skb = skb;
-        pbuf->cmd = TX_ETHER_PKT;
         pbuf->frag_count = frag_count;
-        pbuf->port = adapter->portnum;
         buffrag = &pbuf->frag_array[0];
         buffrag->dma = pci_map_single(adapter->pdev, skb->data, first_seg_len,
                                       PCI_DMA_TODEVICE);
         buffrag->length = first_seg_len;
-        netxen_set_cmd_desc_totallength(hwdesc, skb->len);
-        netxen_set_cmd_desc_num_of_buff(hwdesc, frag_count);
-        netxen_set_cmd_desc_opcode(hwdesc, TX_ETHER_PKT);
+        netxen_set_tx_frags_len(hwdesc, frag_count, skb->len);
+        netxen_set_tx_port(hwdesc, adapter->portnum);
 
-        netxen_set_cmd_desc_port(hwdesc, adapter->portnum);
-        netxen_set_cmd_desc_ctxid(hwdesc, adapter->portnum);
         hwdesc->buffer1_length = cpu_to_le16(first_seg_len);
         hwdesc->addr_buffer1 = cpu_to_le64(buffrag->dma);
 
@@ -1285,16 +1278,12 @@ static int netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
         }
         producer = get_next_index(producer, num_txd);
 
-        /* might change opcode to TX_TCP_LSO */
-        netxen_tso_check(adapter, &hw->cmd_desc_head[saved_producer], skb);
-
         /* For LSO, we need to copy the MAC/IP/TCP headers into
          * the descriptor ring
          */
-        if (netxen_get_cmd_desc_opcode(&hw->cmd_desc_head[saved_producer])
-            == TX_TCP_LSO) {
+        if (is_tso) {
                 int hdr_len, first_hdr_len, more_hdr;
-                hdr_len = hw->cmd_desc_head[saved_producer].total_hdr_length;
+                hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
                 if (hdr_len > (sizeof(struct cmd_desc_type0) - 2)) {
                         first_hdr_len = sizeof(struct cmd_desc_type0) - 2;
                         more_hdr = 1;