Subject: [PATCH 11/21] orinoco: don't use any padding for Tx frames

From: Pavel Roskin <proski-mXXj517/[email-masked]>
Date: Fri, 07 Apr 2006 04:10:41 -0400

From: Pavel Roskin <proski-mXXj517/[email-masked]>

hermes_bap_pwrite() supports odd-sized packets now.   There is no
minimal packet size for 802.11.  Also, hermes_bap_pwrite() supports
odd-sized packets now.  This removes all reasons to pad the Tx data.

Signed-off-by: Pavel Roskin <proski-mXXj517/[email-masked]>
---

 drivers/net/wireless/hermes.c  |   38 --------------------------------------
 drivers/net/wireless/hermes.h  |    2 --
 drivers/net/wireless/orinoco.c |   25 +++++++------------------
 3 files changed, 7 insertions(+), 58 deletions(-)

diff --git a/drivers/net/wireless/hermes.c b/drivers/net/wireless/hermes.c
index be24f01..2aa2f38 100644
--- a/drivers/net/wireless/hermes.c
+++ b/drivers/net/wireless/hermes.c
@@ -424,43 +424,6 @@ int hermes_bap_pwrite(hermes_t *hw, int 
 	return err;
 }
 
-/* Write a block of data to the chip's buffer with padding if
- * neccessary, via the BAP. Synchronization/serialization is the
- * caller's problem.
- *
- * Returns: < 0 on internal failure (errno), 0 on success, > 0 on error from firmware
- */
-int hermes_bap_pwrite_pad(hermes_t *hw, int bap, const void *buf, unsigned data_len, int len,
-		      u16 id, u16 offset)
-{
-	int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
-	int err = 0;
-
-	if (len < 0 || data_len > len)
-		return -EINVAL;
-
-	err = hermes_bap_seek(hw, bap, id, offset);
-	if (err)
-		goto out;
-
-	/* Transfer all the complete words of data */
-	hermes_write_bytes(hw, dreg, buf, data_len);
-	/* If there is an odd byte left over pad and transfer it */
-	if (data_len & 1) {
-		u8 end[2];
-		end[1] = 0;
-		end[0] = ((unsigned char *)buf)[data_len - 1];
-		hermes_write_bytes(hw, dreg, end, 2);
-		data_len ++;
-	}
-	/* Now send zeros for the padding */
-	if (data_len < len)
-		hermes_clear_words(hw, dreg, (len - data_len) / 2);
-	/* Complete */
- out:
-	return err;
-}
-
 /* Read a Length-Type-Value record from the card.
  *
  * If length is NULL, we ignore the length read from the card, and
@@ -548,7 +511,6 @@ EXPORT_SYMBOL(hermes_allocate);
 
 EXPORT_SYMBOL(hermes_bap_pread);
 EXPORT_SYMBOL(hermes_bap_pwrite);
-EXPORT_SYMBOL(hermes_bap_pwrite_pad);
 EXPORT_SYMBOL(hermes_read_ltv);
 EXPORT_SYMBOL(hermes_write_ltv);
 
diff --git a/drivers/net/wireless/hermes.h b/drivers/net/wireless/hermes.h
index e1b279e..8e3f0e3 100644
--- a/drivers/net/wireless/hermes.h
+++ b/drivers/net/wireless/hermes.h
@@ -359,8 +359,6 @@ int hermes_bap_pread(hermes_t *hw, int b
 		       u16 id, u16 offset);
 int hermes_bap_pwrite(hermes_t *hw, int bap, const void *buf, int len,
 			u16 id, u16 offset);
-int hermes_bap_pwrite_pad(hermes_t *hw, int bap, const void *buf,
-			unsigned data_len, int len, u16 id, u16 offset);
 int hermes_read_ltv(hermes_t *hw, int bap, u16 rid, unsigned buflen,
 		    u16 *length, void *buf);
 int hermes_write_ltv(hermes_t *hw, int bap, u16 rid,
diff --git a/drivers/net/wireless/orinoco.c b/drivers/net/wireless/orinoco.c
index 173e9e4..9fde17b 100644
--- a/drivers/net/wireless/orinoco.c
+++ b/drivers/net/wireless/orinoco.c
@@ -423,7 +423,7 @@ static int orinoco_xmit(struct sk_buff *
 	u16 txfid = priv->txfid;
 	char *p;
 	struct ethhdr *eh;
-	int len, data_len, data_off;
+	int data_len, data_off;
 	struct hermes_tx_descriptor desc;
 	unsigned long flags;
 
@@ -455,13 +455,10 @@ static int orinoco_xmit(struct sk_buff *
 		return NETDEV_TX_OK;
 	}
 
-	/* Length of the packet body */
-	/* FIXME: what if the skb is smaller than this? */
-	len = max_t(int, ALIGN(skb->len, 2), ETH_ZLEN);
-	skb = skb_padto(skb, len);
-	if (skb == NULL)
+	/* Check packet length */
+	data_len = skb->len;
+	if (data_len < ETH_HLEN)
 		goto fail;
-	len -= ETH_HLEN;
 
 	eh = (struct ethhdr *)skb->data;
 
@@ -485,7 +482,7 @@ static int orinoco_xmit(struct sk_buff *
 	/* Encapsulate Ethernet-II frames */
 	if (ntohs(eh->h_proto) > ETH_DATA_LEN) { /* Ethernet-II frame */
 		struct header_struct hdr;
-		data_len = len;
+		data_len = skb->len - ETH_HLEN;
 		data_off = HERMES_802_3_OFFSET + sizeof(hdr);
 		p = skb->data + ETH_HLEN;
 
@@ -507,21 +504,13 @@ static int orinoco_xmit(struct sk_buff *
 			stats->tx_errors++;
 			goto fail;
 		}
-		/* Actual xfer length - allow for padding */
-		len = ALIGN(data_len, 2);
-		if (len < ETH_ZLEN - ETH_HLEN)
-			len = ETH_ZLEN - ETH_HLEN;
 	} else { /* IEEE 802.3 frame */
-		data_len = len + ETH_HLEN;
+		data_len = skb->len;
 		data_off = HERMES_802_3_OFFSET;
 		p = skb->data;
-		/* Actual xfer length - round up for odd length packets */
-		len = ALIGN(data_len, 2);
-		if (len < ETH_ZLEN)
-			len = ETH_ZLEN;
 	}
 
-	err = hermes_bap_pwrite_pad(hw, USER_BAP, p, data_len, len,
+	err = hermes_bap_pwrite(hw, USER_BAP, p, data_len,
 				txfid, data_off);
 	if (err) {
 		printk(KERN_ERR "%s: Error %d writing packet to BAP\n",

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