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authorIvo van Doorn <ivdoorn@gmail.com>2008-03-09 22:38:18 +0100
committerJohn W. Linville <linville@tuxdriver.com>2008-03-13 16:02:33 -0400
commitf855c10b6e7b0c448c35b88266f788dd3738375e (patch)
tree0144787573334e3b87b957347d01453196dc870b /drivers/net/wireless/rt2x00
parent40e024de932cca8b54fbcd0e5faf8f364cc84ec0 (diff)
rt2x00: Align RX descriptor to 4 bytes
Some architectures give problems when reading RX frame descriptor words when the descriptor is not aligned on a 4 byte boundrary. Due to optimalizations for the ieee80211 payload 4 byte alignment, it is no longer guarenteed that the descriptor is placed on the 4 byte boundrary (In fact, for rt73usb it is absolutely never aligned to 4 bytes, for rt2500usb it depends on the length of the payload). This will copy the descriptor to a 4 byte aligned location before it is read for the first time. This will also move the payload data alignment in rt2x00usb (instead of inside the driver) where it has always belonged. Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/rt2x00')
-rw-r--r--drivers/net/wireless/rt2x00/rt2500usb.c37
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00usb.c17
-rw-r--r--drivers/net/wireless/rt2x00/rt73usb.c39
3 files changed, 49 insertions, 44 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c
index 9f59db91cfc..86cd9a5eee2 100644
--- a/drivers/net/wireless/rt2x00/rt2500usb.c
+++ b/drivers/net/wireless/rt2x00/rt2500usb.c
@@ -1117,11 +1117,24 @@ static void rt2500usb_fill_rxdone(struct queue_entry *entry,
__le32 *rxd =
(__le32 *)(entry->skb->data +
(priv_rx->urb->actual_length - entry->queue->desc_size));
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
- int header_size = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
+ unsigned int offset = entry->queue->desc_size + 2;
u32 word0;
u32 word1;
+ /*
+ * Copy descriptor to the available headroom inside the skbuffer.
+ * Remove the original copy by trimming the skbuffer.
+ */
+ skb_push(entry->skb, offset);
+ memcpy(entry->skb->data, rxd, entry->queue->desc_size);
+ rxd = (__le32 *)entry->skb->data;
+ skb_pull(entry->skb, offset);
+ skb_trim(entry->skb, rxdesc->size);
+
+ /*
+ * The descriptor is now aligned to 4 bytes and thus it is
+ * now safe to read it on all architectures.
+ */
rt2x00_desc_read(rxd, 0, &word0);
rt2x00_desc_read(rxd, 1, &word1);
@@ -1142,28 +1155,12 @@ static void rt2500usb_fill_rxdone(struct queue_entry *entry,
rxdesc->my_bss = !!rt2x00_get_field32(word0, RXD_W0_MY_BSS);
/*
- * The data behind the ieee80211 header must be
- * aligned on a 4 byte boundary.
- */
- if (header_size % 4 == 0) {
- skb_push(entry->skb, 2);
- memmove(entry->skb->data, entry->skb->data + 2,
- entry->skb->len - 2);
- }
-
- /*
- * Set descriptor pointer.
+ * Set descriptor and data pointer.
*/
skbdesc->data = entry->skb->data;
skbdesc->data_len = rxdesc->size;
- skbdesc->desc = entry->skb->data + rxdesc->size;
+ skbdesc->desc = entry->skb->data - offset;
skbdesc->desc_len = entry->queue->desc_size;
-
- /*
- * Remove descriptor from skb buffer and trim the whole thing
- * down to only contain data.
- */
- skb_trim(entry->skb, rxdesc->size);
}
/*
diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c
index 063b167da31..512ff391481 100644
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -247,11 +247,11 @@ static struct sk_buff* rt2x00usb_alloc_rxskb(struct data_queue *queue)
* advance.
*/
frame_size = queue->data_size + queue->desc_size;
- skb = dev_alloc_skb(frame_size + 2);
+ skb = dev_alloc_skb(queue->desc_size + frame_size + 2);
if (!skb)
return NULL;
- skb_reserve(skb, 2);
+ skb_reserve(skb, queue->desc_size + 2);
skb_put(skb, frame_size);
return skb;
@@ -264,6 +264,7 @@ static void rt2x00usb_interrupt_rxdone(struct urb *urb)
struct sk_buff *skb;
struct skb_frame_desc *skbdesc;
struct rxdone_entry_desc rxdesc;
+ int header_size;
if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
@@ -288,6 +289,18 @@ static void rt2x00usb_interrupt_rxdone(struct urb *urb)
rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
/*
+ * The data behind the ieee80211 header must be
+ * aligned on a 4 byte boundary.
+ */
+ header_size = ieee80211_get_hdrlen_from_skb(entry->skb);
+ if (header_size % 4 == 0) {
+ skb_push(entry->skb, 2);
+ memmove(entry->skb->data, entry->skb->data + 2,
+ entry->skb->len - 2);
+ skbdesc->data = entry->skb->data;
+ }
+
+ /*
* Allocate a new sk buffer to replace the current one.
* If allocation fails, we should drop the current frame
* so we can recycle the existing sk buffer for the new frame.
diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index 6546b0d607b..b4b70850edf 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -1370,12 +1370,24 @@ static void rt73usb_fill_rxdone(struct queue_entry *entry,
{
struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
__le32 *rxd = (__le32 *)entry->skb->data;
- struct ieee80211_hdr *hdr =
- (struct ieee80211_hdr *)entry->skb->data + entry->queue->desc_size;
- int header_size = ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
+ unsigned int offset = entry->queue->desc_size + 2;
u32 word0;
u32 word1;
+ /*
+ * Copy descriptor to the available headroom inside the skbuffer.
+ * Remove the original copy by pulling the skbuffer.
+ */
+ skb_push(entry->skb, offset);
+ memcpy(entry->skb->data, rxd, entry->queue->desc_size);
+ rxd = (__le32 *)entry->skb->data;
+ skb_pull(entry->skb, offset + skbdesc->desc_len);
+ skb_trim(entry->skb, rxdesc->size);
+
+ /*
+ * The descriptor is now aligned to 4 bytes and thus it is
+ * now safe to read it on all architectures.
+ */
rt2x00_desc_read(rxd, 0, &word0);
rt2x00_desc_read(rxd, 1, &word1);
@@ -1393,29 +1405,12 @@ static void rt73usb_fill_rxdone(struct queue_entry *entry,
rxdesc->my_bss = !!rt2x00_get_field32(word0, RXD_W0_MY_BSS);
/*
- * The data behind the ieee80211 header must be
- * aligned on a 4 byte boundary.
- */
- if (header_size % 4 == 0) {
- skb_push(entry->skb, 2);
- memmove(entry->skb->data, entry->skb->data + 2,
- entry->skb->len - 2);
- }
-
- /*
* Set descriptor and data pointer.
*/
- skbdesc->data = entry->skb->data + entry->queue->desc_size;
+ skbdesc->data = entry->skb->data;
skbdesc->data_len = rxdesc->size;
- skbdesc->desc = entry->skb->data;
+ skbdesc->desc = entry->skb->data - offset;
skbdesc->desc_len = entry->queue->desc_size;
-
- /*
- * Remove descriptor from skb buffer and trim the whole thing
- * down to only contain data.
- */
- skb_pull(entry->skb, skbdesc->desc_len);
- skb_trim(entry->skb, rxdesc->size);
}
/*