diff options
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00queue.c')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00queue.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c index 493066519ef3..2f3dd1d91a12 100644 --- a/drivers/net/wireless/rt2x00/rt2x00queue.c +++ b/drivers/net/wireless/rt2x00/rt2x00queue.c @@ -29,6 +29,45 @@ #include "rt2x00.h" #include "rt2x00lib.h" +struct sk_buff *rt2x00queue_alloc_rxskb(struct data_queue *queue) +{ + struct sk_buff *skb; + unsigned int frame_size; + unsigned int reserved_size; + + /* + * The frame size includes descriptor size, because the + * hardware directly receive the frame into the skbuffer. + */ + frame_size = queue->data_size + queue->desc_size; + + /* + * For the allocation we should keep a few things in mind: + * 1) 4byte alignment of 802.11 payload + * + * For (1) we need at most 4 bytes to guarentee the correct + * alignment. We are going to optimize the fact that the chance + * that the 802.11 header_size % 4 == 2 is much bigger then + * anything else. However since we need to move the frame up + * to 3 bytes to the front, which means we need to preallocate + * 6 bytes. + */ + reserved_size = 6; + + /* + * Allocate skbuffer. + */ + skb = dev_alloc_skb(frame_size + reserved_size); + if (!skb) + return NULL; + + skb_reserve(skb, reserved_size); + skb_put(skb, frame_size); + + return skb; +} +EXPORT_SYMBOL_GPL(rt2x00queue_alloc_rxskb); + void rt2x00queue_create_tx_descriptor(struct queue_entry *entry, struct txentry_desc *txdesc) { |