Re: [PATCH 4/7] rt2800usb: Let rt2x00usb handle USB padding
From: Ivo Van Doorn <hidden>
Date: 2011-12-28 20:12:10
On Wed, Dec 28, 2011 at 1:53 AM, Gertjan van Wingerde [off-list ref] wrote:
From: Jakub Kiciński <redacted> Older USB drivers does not append end padding to skb but instead report it in size of data to be transmitted to HW. rt2800usb should follow that behaviour. Custom write_tx_data callback which was adding pad to skb is not be needed any more. Thanks to this patch frames handed back from rt2800usb to mac80211 will no longer contain end padding.
What happened to the reports that after this (and the next) patch, the non-2800 USB drivers are failing?
quoted hunk ↗ jump to hunk
Signed-off-by: Jakub Kicinski <redacted> Signed-off-by: Gertjan van Wingerde <redacted> --- drivers/net/wireless/rt2x00/rt2800usb.c | 37 ++++++++---------------------- 1 files changed, 10 insertions(+), 27 deletions(-)diff --git a/drivers/net/wireless/rt2x00/rt2800usb.c b/drivers/net/wireless/rt2x00/rt2800usb.c index 313cc7f..b15c215 100644 --- a/drivers/net/wireless/rt2x00/rt2800usb.c +++ b/drivers/net/wireless/rt2x00/rt2800usb.c@@ -400,10 +400,10 @@ static void rt2800usb_write_tx_desc(struct queue_entry *entry,/* * The size of TXINFO_W0_USB_DMA_TX_PKT_LEN is * TXWI + 802.11 header + L2 pad + payload + pad, - * so need to decrease size of TXINFO and USB end pad. + * so need to decrease size of TXINFO. */ rt2x00_set_field32(&word, TXINFO_W0_USB_DMA_TX_PKT_LEN, - entry->skb->len - TXINFO_DESC_SIZE - 4); + roundup(entry->skb->len, 4) - TXINFO_DESC_SIZE); rt2x00_set_field32(&word, TXINFO_W0_WIV, !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc->flags)); rt2x00_set_field32(&word, TXINFO_W0_QSEL, 2);@@ -421,37 +421,20 @@ static void rt2800usb_write_tx_desc(struct queue_entry *entry,skbdesc->desc_len = TXINFO_DESC_SIZE + TXWI_DESC_SIZE; } -static void rt2800usb_write_tx_data(struct queue_entry *entry, - struct txentry_desc *txdesc) +/* + * TX data initialization + */ +static int rt2800usb_get_tx_data_len(struct queue_entry *entry) { - unsigned int len; - int err; - - rt2800_write_tx_data(entry, txdesc); - /* - * pad(1~3 bytes) is added after each 802.11 payload. - * USB end pad(4 bytes) is added at each USB bulk out packet end. + * pad(1~3 bytes) is needed after each 802.11 payload. + * USB end pad(4 bytes) is needed at each USB bulk out packet end. * TX frame format is : * | TXINFO | TXWI | 802.11 header | L2 pad | payload | pad | USB end pad | * |<------------- tx_pkt_len ------------->| */ - len = roundup(entry->skb->len, 4) + 4; - err = skb_padto(entry->skb, len); - if (unlikely(err)) { - WARNING(entry->queue->rt2x00dev, "TX SKB padding error, out of memory\n"); - return; - } - entry->skb->len = len; -} - -/* - * TX data initialization - */ -static int rt2800usb_get_tx_data_len(struct queue_entry *entry) -{ - return entry->skb->len; + return roundup(entry->skb->len, 4) + 4; } /*@@ -807,7 +790,7 @@ static const struct rt2x00lib_ops rt2800usb_rt2x00_ops = {.flush_queue = rt2x00usb_flush_queue, .tx_dma_done = rt2800usb_tx_dma_done, .write_tx_desc = rt2800usb_write_tx_desc, - .write_tx_data = rt2800usb_write_tx_data, + .write_tx_data = rt2800_write_tx_data, .write_beacon = rt2800_write_beacon, .clear_beacon = rt2800_clear_beacon, .get_tx_data_len = rt2800usb_get_tx_data_len, -- 1.7.7.4