/*
- Copyright (C) 2004 - 2009 rt2x00 SourceForge Project
+ Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
+ Copyright (C) 2004 - 2009 Gertjan van Wingerde <gwingerde@gmail.com>
<http://rt2x00.serialmonkey.com>
This program is free software; you can redistribute it and/or modify
* is also mapped to the DMA so it can be used for transfering
* additional descriptor information to the hardware.
*/
- skb_push(skb, rt2x00dev->hw->extra_tx_headroom);
+ skb_push(skb, rt2x00dev->ops->extra_tx_headroom);
skbdesc->skb_dma =
dma_map_single(rt2x00dev->dev, skb->data, skb->len, DMA_TO_DEVICE);
/*
* Restore data pointer to original location again.
*/
- skb_pull(skb, rt2x00dev->hw->extra_tx_headroom);
+ skb_pull(skb, rt2x00dev->ops->extra_tx_headroom);
skbdesc->flags |= SKBDESC_DMA_MAPPED_TX;
}
* by the driver, but it was actually mapped to DMA.
*/
dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma,
- skb->len + rt2x00dev->hw->extra_tx_headroom,
+ skb->len + rt2x00dev->ops->extra_tx_headroom,
DMA_TO_DEVICE);
skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX;
}
dev_kfree_skb_any(skb);
}
-void rt2x00queue_payload_align(struct sk_buff *skb,
- bool l2pad, unsigned int header_length)
+void rt2x00queue_align_frame(struct sk_buff *skb)
+{
+ unsigned int frame_length = skb->len;
+ unsigned int align = ALIGN_SIZE(skb, 0);
+
+ if (!align)
+ return;
+
+ skb_push(skb, align);
+ memmove(skb->data, skb->data + align, frame_length);
+ skb_trim(skb, frame_length);
+}
+
+void rt2x00queue_align_payload(struct sk_buff *skb, unsigned int header_length)
{
- struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
unsigned int frame_length = skb->len;
unsigned int align = ALIGN_SIZE(skb, header_length);
if (!align)
return;
- if (l2pad) {
- if (skbdesc->flags & SKBDESC_L2_PADDED) {
- /* Remove L2 padding */
- memmove(skb->data + align, skb->data, header_length);
- skb_pull(skb, align);
- skbdesc->flags &= ~SKBDESC_L2_PADDED;
- } else {
- /* Add L2 padding */
- skb_push(skb, align);
- memmove(skb->data, skb->data + align, header_length);
- skbdesc->flags |= SKBDESC_L2_PADDED;
- }
+ skb_push(skb, align);
+ memmove(skb->data, skb->data + align, frame_length);
+ skb_trim(skb, frame_length);
+}
+
+void rt2x00queue_insert_l2pad(struct sk_buff *skb, unsigned int header_length)
+{
+ struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
+ unsigned int frame_length = skb->len;
+ unsigned int header_align = ALIGN_SIZE(skb, 0);
+ unsigned int payload_align = ALIGN_SIZE(skb, header_length);
+ unsigned int l2pad = 4 - (payload_align - header_align);
+
+ if (header_align == payload_align) {
+ /*
+ * Both header and payload must be moved the same
+ * amount of bytes to align them properly. This means
+ * we don't use the L2 padding but just move the entire
+ * frame.
+ */
+ rt2x00queue_align_frame(skb);
+ } else if (!payload_align) {
+ /*
+ * Simple L2 padding, only the header needs to be moved,
+ * the payload is already properly aligned.
+ */
+ skb_push(skb, header_align);
+ memmove(skb->data, skb->data + header_align, frame_length);
+ skbdesc->flags |= SKBDESC_L2_PADDED;
} else {
- /* Generic payload alignment to 4-byte boundary */
- skb_push(skb, align);
- memmove(skb->data, skb->data + align, frame_length);
+ /*
+ *
+ * Complicated L2 padding, both header and payload need
+ * to be moved. By default we only move to the start
+ * of the buffer, so our header alignment needs to be
+ * increased if there is not enough room for the header
+ * to be moved.
+ */
+ if (payload_align > header_align)
+ header_align += 4;
+
+ skb_push(skb, header_align);
+ memmove(skb->data, skb->data + header_align, header_length);
+ memmove(skb->data + header_length + l2pad,
+ skb->data + header_length + l2pad + payload_align,
+ frame_length - header_length);
+ skbdesc->flags |= SKBDESC_L2_PADDED;
}
}
+void rt2x00queue_remove_l2pad(struct sk_buff *skb, unsigned int header_length)
+{
+ struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
+ unsigned int l2pad = 4 - (header_length & 3);
+
+ if (!l2pad || (skbdesc->flags & SKBDESC_L2_PADDED))
+ return;
+
+ memmove(skb->data + l2pad, skb->data, header_length);
+ skb_pull(skb, l2pad);
+}
+
static void rt2x00queue_create_tx_descriptor_seq(struct queue_entry *entry,
struct txentry_desc *txdesc)
{
rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, queue->qid);
}
-int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
+int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb,
+ bool local)
{
struct ieee80211_tx_info *tx_info;
struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
skbdesc->tx_rate_idx = rate_idx;
skbdesc->tx_rate_flags = rate_flags;
+ if (local)
+ skbdesc->flags |= SKBDESC_NOT_MAC80211;
+
/*
* When hardware encryption is supported, and this frame
* is to be encrypted, we should strip the IV/EIV data from
/*
* When DMA allocation is required we should guarentee to the
* driver that the DMA is aligned to a 4-byte boundary.
- * Aligning the header to this boundary can be done by calling
- * rt2x00queue_payload_align with the header length of 0.
* However some drivers require L2 padding to pad the payload
* rather then the header. This could be a requirement for
* PCI and USB devices, while header alignment only is valid
* for PCI devices.
*/
if (test_bit(DRIVER_REQUIRE_L2PAD, &queue->rt2x00dev->flags))
- rt2x00queue_payload_align(entry->skb, true,
- txdesc.header_length);
+ rt2x00queue_insert_l2pad(entry->skb, txdesc.header_length);
else if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
- rt2x00queue_payload_align(entry->skb, false, 0);
+ rt2x00queue_align_frame(entry->skb);
/*
* It could be possible that the queue was corrupted and this
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff