[PATCH] orinoco: simplify 802.3 encapsulation code

Use skb_pull() to strip the addresses from the original packet.  Don't
strip protocol bytes.

Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 20 insertions, 24 deletions

diff --git a/drivers/net/wireless/orinoco.c b/drivers/net/wireless/orinoco.c
index e7d06b90afe2..4d6373814b93 100644
--- a/drivers/net/wireless/orinoco.c
+++ b/drivers/net/wireless/orinoco.c
@@ -421,9 +421,8 @@ static int orinoco_xmit(struct sk_buff *skb, struct net_device *dev)
         hermes_t *hw = &priv->hw;
         int err = 0;
         u16 txfid = priv->txfid;
-        char *p;
         struct ethhdr *eh;
-        int data_len, data_off;
+        int data_off;
         struct hermes_tx_descriptor desc;
         unsigned long flags;
 
@@ -453,8 +452,7 @@ static int orinoco_xmit(struct sk_buff *skb, struct net_device *dev)
         }
 
         /* Check packet length */
-        data_len = skb->len;
-        if (data_len < ETH_HLEN)
+        if (skb->len < ETH_HLEN)
                 goto drop;
 
         eh = (struct ethhdr *)skb->data;
@@ -477,22 +475,22 @@ static int orinoco_xmit(struct sk_buff *skb, struct net_device *dev)
 
         /* Encapsulate Ethernet-II frames */
         if (ntohs(eh->h_proto) > ETH_DATA_LEN) { /* Ethernet-II frame */
-                struct header_struct hdr;
-                data_len = skb->len - ETH_HLEN;
-                data_off = HERMES_802_3_OFFSET + sizeof(hdr);
-                p = skb->data + ETH_HLEN;
-
-                /* 802.3 header */
-                memcpy(hdr.dest, eh->h_dest, ETH_ALEN);
-                memcpy(hdr.src, eh->h_source, ETH_ALEN);
-                hdr.len = htons(data_len + ENCAPS_OVERHEAD);
-                
-                /* 802.2 header */
-                memcpy(&hdr.dsap, &encaps_hdr, sizeof(encaps_hdr));
-                        
-                hdr.ethertype = eh->h_proto;
-                err  = hermes_bap_pwrite(hw, USER_BAP, &hdr, sizeof(hdr),
-                                         txfid, HERMES_802_3_OFFSET);
+                struct header_struct {
+                        struct ethhdr eth;      /* 802.3 header */
+                        u8 encap[6];            /* 802.2 header */
+                } __attribute__ ((packed)) hdr;
+
+                /* Strip destination and source from the data */
+                skb_pull(skb, 2 * ETH_ALEN);
+                data_off = HERMES_802_2_OFFSET + sizeof(encaps_hdr);
+
+                /* And move them to a separate header */
+                memcpy(&hdr.eth, eh, 2 * ETH_ALEN);
+                hdr.eth.h_proto = htons(sizeof(encaps_hdr) + skb->len);
+                memcpy(hdr.encap, encaps_hdr, sizeof(encaps_hdr));
+
+                err = hermes_bap_pwrite(hw, USER_BAP, &hdr, sizeof(hdr),
+                                        txfid, HERMES_802_3_OFFSET);
                 if (err) {
                         if (net_ratelimit())
                                 printk(KERN_ERR "%s: Error %d writing packet "
@@ -500,12 +498,10 @@ static int orinoco_xmit(struct sk_buff *skb, struct net_device *dev)
                         goto busy;
                 }
         } else { /* IEEE 802.3 frame */
-                data_len = skb->len;
                 data_off = HERMES_802_3_OFFSET;
-                p = skb->data;
         }
 
-        err = hermes_bap_pwrite(hw, USER_BAP, p, data_len,
+        err = hermes_bap_pwrite(hw, USER_BAP, skb->data, skb->len,
                                 txfid, data_off);
         if (err) {
                 printk(KERN_ERR "%s: Error %d writing packet to BAP\n",
@@ -527,7 +523,7 @@ static int orinoco_xmit(struct sk_buff *skb, struct net_device *dev)
         }
 
         dev->trans_start = jiffies;
-        stats->tx_bytes += data_off + data_len;
+        stats->tx_bytes += data_off + skb->len;
         goto ok;
 
  drop: