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path: root/drivers/net/wireless/rt2x00/rt2x00queue.c
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Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00queue.c')
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00queue.c136
1 files changed, 114 insertions, 22 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c
index 898cdd7f57d..1676ac48479 100644
--- a/drivers/net/wireless/rt2x00/rt2x00queue.c
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
@@ -33,10 +33,11 @@
struct sk_buff *rt2x00queue_alloc_rxskb(struct rt2x00_dev *rt2x00dev,
struct queue_entry *entry)
{
- unsigned int frame_size;
- unsigned int reserved_size;
struct sk_buff *skb;
struct skb_frame_desc *skbdesc;
+ unsigned int frame_size;
+ unsigned int head_size = 0;
+ unsigned int tail_size = 0;
/*
* The frame size includes descriptor size, because the
@@ -49,16 +50,32 @@ struct sk_buff *rt2x00queue_alloc_rxskb(struct rt2x00_dev *rt2x00dev,
* this means we need at least 3 bytes for moving the frame
* into the correct offset.
*/
- reserved_size = 4;
+ head_size = 4;
+
+ /*
+ * For IV/EIV/ICV assembly we must make sure there is
+ * at least 8 bytes bytes available in headroom for IV/EIV
+ * and 4 bytes for ICV data as tailroon.
+ */
+#ifdef CONFIG_RT2X00_LIB_CRYPTO
+ if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags)) {
+ head_size += 8;
+ tail_size += 4;
+ }
+#endif /* CONFIG_RT2X00_LIB_CRYPTO */
/*
* Allocate skbuffer.
*/
- skb = dev_alloc_skb(frame_size + reserved_size);
+ skb = dev_alloc_skb(frame_size + head_size + tail_size);
if (!skb)
return NULL;
- skb_reserve(skb, reserved_size);
+ /*
+ * Make sure we not have a frame with the requested bytes
+ * available in the head and tail.
+ */
+ skb_reserve(skb, head_size);
skb_put(skb, frame_size);
/*
@@ -83,8 +100,21 @@ void rt2x00queue_map_txskb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
{
struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
- skbdesc->skb_dma = dma_map_single(rt2x00dev->dev, skb->data, skb->len,
- DMA_TO_DEVICE);
+ /*
+ * If device has requested headroom, we should make sure that
+ * 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);
+
+ 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);
+
skbdesc->flags |= SKBDESC_DMA_MAPPED_TX;
}
EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb);
@@ -100,7 +130,12 @@ void rt2x00queue_unmap_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
}
if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) {
- dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len,
+ /*
+ * Add headroom to the skb length, it has been removed
+ * 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,
DMA_TO_DEVICE);
skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX;
}
@@ -120,7 +155,6 @@ static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
{
struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
- struct rt2x00_intf *intf = vif_to_intf(tx_info->control.vif);
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
struct ieee80211_rate *rate =
ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
@@ -140,7 +174,7 @@ static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
txdesc->cw_max = entry->queue->cw_max;
txdesc->aifs = entry->queue->aifs;
- /* Data length should be extended with 4 bytes for CRC */
+ /* Data length + CRC + IV/EIV/ICV/MMIC (when using encryption) */
data_length = entry->skb->len + 4;
/*
@@ -149,6 +183,35 @@ static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
__set_bit(ENTRY_TXD_ACK, &txdesc->flags);
+#ifdef CONFIG_RT2X00_LIB_CRYPTO
+ if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags) &&
+ !entry->skb->do_not_encrypt) {
+ struct ieee80211_key_conf *hw_key = tx_info->control.hw_key;
+
+ __set_bit(ENTRY_TXD_ENCRYPT, &txdesc->flags);
+
+ txdesc->cipher = rt2x00crypto_key_to_cipher(hw_key);
+
+ if (hw_key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
+ __set_bit(ENTRY_TXD_ENCRYPT_PAIRWISE, &txdesc->flags);
+
+ txdesc->key_idx = hw_key->hw_key_idx;
+ txdesc->iv_offset = ieee80211_get_hdrlen_from_skb(entry->skb);
+
+ /*
+ * Extend frame length to include all encryption overhead
+ * that will be added by the hardware.
+ */
+ data_length += rt2x00crypto_tx_overhead(tx_info);
+
+ if (!(hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV))
+ __set_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc->flags);
+
+ if (!(hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_MMIC))
+ __set_bit(ENTRY_TXD_ENCRYPT_MMIC, &txdesc->flags);
+ }
+#endif /* CONFIG_RT2X00_LIB_CRYPTO */
+
/*
* Check if this is a RTS/CTS frame
*/
@@ -214,16 +277,22 @@ static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
* sequence counter given by mac80211.
*/
if (tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
- spin_lock_irqsave(&intf->seqlock, irqflags);
+ if (likely(tx_info->control.vif)) {
+ struct rt2x00_intf *intf;
- if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
- intf->seqno += 0x10;
- hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
- hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
+ intf = vif_to_intf(tx_info->control.vif);
- spin_unlock_irqrestore(&intf->seqlock, irqflags);
+ spin_lock_irqsave(&intf->seqlock, irqflags);
- __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
+ if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
+ intf->seqno += 0x10;
+ hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
+ hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
+
+ spin_unlock_irqrestore(&intf->seqlock, irqflags);
+
+ __set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
+ }
}
/*
@@ -305,11 +374,12 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
struct txentry_desc txdesc;
struct skb_frame_desc *skbdesc;
+ unsigned int iv_len;
if (unlikely(rt2x00queue_full(queue)))
return -EINVAL;
- if (__test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
+ if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
ERROR(queue->rt2x00dev,
"Arrived at non-free entry in the non-full queue %d.\n"
"Please file bug report to %s.\n",
@@ -326,21 +396,42 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
rt2x00queue_create_tx_descriptor(entry, &txdesc);
/*
- * skb->cb array is now ours and we are free to use it.
+ * All information is retreived from the skb->cb array,
+ * now we should claim ownership of the driver part of that
+ * array.
*/
skbdesc = get_skb_frame_desc(entry->skb);
memset(skbdesc, 0, sizeof(*skbdesc));
skbdesc->entry = entry;
+ /*
+ * When hardware encryption is supported, and this frame
+ * is to be encrypted, we should strip the IV/EIV data from
+ * the frame so we can provide it to the driver seperately.
+ */
+ if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
+ !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags) &&
+ (IEEE80211_SKB_CB(skb)->control.hw_key != NULL)) {
+ iv_len = IEEE80211_SKB_CB(skb)->control.hw_key->iv_len;
+ rt2x00crypto_tx_remove_iv(skb, iv_len);
+ }
+
+ /*
+ * It could be possible that the queue was corrupted and this
+ * call failed. Just drop the frame, we cannot rollback and pass
+ * the frame to mac80211 because the skb->cb has now been tainted.
+ */
if (unlikely(queue->rt2x00dev->ops->lib->write_tx_data(entry))) {
- __clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
- return -EIO;
+ clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
+ dev_kfree_skb_any(entry->skb);
+ entry->skb = NULL;
+ return 0;
}
if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
rt2x00queue_map_txskb(queue->rt2x00dev, skb);
- __set_bit(ENTRY_DATA_PENDING, &entry->flags);
+ set_bit(ENTRY_DATA_PENDING, &entry->flags);
rt2x00queue_index_inc(queue, Q_INDEX);
rt2x00queue_write_tx_descriptor(entry, &txdesc);
@@ -653,6 +744,7 @@ static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
queue->rt2x00dev = rt2x00dev;
queue->qid = qid;
+ queue->txop = 0;
queue->aifs = 2;
queue->cw_min = 5;
queue->cw_max = 10;