diff options
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00queue.c')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00queue.c | 136 |
1 files changed, 114 insertions, 22 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c index 898cdd7f57d9..1676ac484790 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; |