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-rw-r--r--drivers/net/wireless/b43/dma.c38
-rw-r--r--drivers/net/wireless/b43/dma.h4
2 files changed, 25 insertions, 17 deletions
diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c
index 38246046a42f..189b2ec1bac7 100644
--- a/drivers/net/wireless/b43/dma.c
+++ b/drivers/net/wireless/b43/dma.c
@@ -41,6 +41,12 @@
#include <asm/div64.h>
+/* Required number of TX DMA slots per TX frame.
+ * This currently is 2, because we put the header and the ieee80211 frame
+ * into separate slots. */
+#define TX_SLOTS_PER_FRAME 2
+
+
/* 32bit DMA ops. */
static
struct b43_dmadesc_generic *op32_idx2desc(struct b43_dmaring *ring,
@@ -574,12 +580,11 @@ static int setup_rx_descbuffer(struct b43_dmaring *ring,
return -ENOMEM;
dmaaddr = map_descbuffer(ring, skb->data,
ring->rx_buffersize, 0);
- }
-
- if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) {
- b43err(ring->dev->wl, "RX DMA buffer allocation failed\n");
- dev_kfree_skb_any(skb);
- return -EIO;
+ if (b43_dma_mapping_error(ring, dmaaddr, ring->rx_buffersize, 0)) {
+ b43err(ring->dev->wl, "RX DMA buffer allocation failed\n");
+ dev_kfree_skb_any(skb);
+ return -EIO;
+ }
}
meta->skb = skb;
@@ -837,7 +842,7 @@ struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev,
#endif
if (for_tx) {
- ring->txhdr_cache = kcalloc(ring->nr_slots,
+ ring->txhdr_cache = kcalloc(ring->nr_slots / TX_SLOTS_PER_FRAME,
b43_txhdr_size(dev),
GFP_KERNEL);
if (!ring->txhdr_cache)
@@ -853,7 +858,7 @@ struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev,
b43_txhdr_size(dev), 1)) {
/* ugh realloc */
kfree(ring->txhdr_cache);
- ring->txhdr_cache = kcalloc(ring->nr_slots,
+ ring->txhdr_cache = kcalloc(ring->nr_slots / TX_SLOTS_PER_FRAME,
b43_txhdr_size(dev),
GFP_KERNEL | GFP_DMA);
if (!ring->txhdr_cache)
@@ -1144,7 +1149,10 @@ static int dma_tx_fragment(struct b43_dmaring *ring,
u16 cookie;
size_t hdrsize = b43_txhdr_size(ring->dev);
-#define SLOTS_PER_PACKET 2
+ /* Important note: If the number of used DMA slots per TX frame
+ * is changed here, the TX_SLOTS_PER_FRAME definition at the top of
+ * the file has to be updated, too!
+ */
old_top_slot = ring->current_slot;
old_used_slots = ring->used_slots;
@@ -1154,7 +1162,7 @@ static int dma_tx_fragment(struct b43_dmaring *ring,
desc = ops->idx2desc(ring, slot, &meta_hdr);
memset(meta_hdr, 0, sizeof(*meta_hdr));
- header = &(ring->txhdr_cache[slot * hdrsize]);
+ header = &(ring->txhdr_cache[(slot / TX_SLOTS_PER_FRAME) * hdrsize]);
cookie = generate_cookie(ring, slot);
err = b43_generate_txhdr(ring->dev, header,
skb->data, skb->len, info, cookie);
@@ -1308,7 +1316,7 @@ int b43_dma_tx(struct b43_wldev *dev, struct sk_buff *skb)
* That would be a mac80211 bug. */
B43_WARN_ON(ring->stopped);
- if (unlikely(free_slots(ring) < SLOTS_PER_PACKET)) {
+ if (unlikely(free_slots(ring) < TX_SLOTS_PER_FRAME)) {
b43warn(dev->wl, "DMA queue overflow\n");
err = -ENOSPC;
goto out_unlock;
@@ -1332,7 +1340,7 @@ int b43_dma_tx(struct b43_wldev *dev, struct sk_buff *skb)
goto out_unlock;
}
ring->nr_tx_packets++;
- if ((free_slots(ring) < SLOTS_PER_PACKET) ||
+ if ((free_slots(ring) < TX_SLOTS_PER_FRAME) ||
should_inject_overflow(ring)) {
/* This TX ring is full. */
ieee80211_stop_queue(dev->wl->hw, skb_get_queue_mapping(skb));
@@ -1416,7 +1424,7 @@ void b43_dma_handle_txstatus(struct b43_wldev *dev,
}
dev->stats.last_tx = jiffies;
if (ring->stopped) {
- B43_WARN_ON(free_slots(ring) < SLOTS_PER_PACKET);
+ B43_WARN_ON(free_slots(ring) < TX_SLOTS_PER_FRAME);
ieee80211_wake_queue(dev->wl->hw, ring->queue_prio);
ring->stopped = 0;
if (b43_debug(dev, B43_DBG_DMAVERBOSE)) {
@@ -1439,8 +1447,8 @@ void b43_dma_get_tx_stats(struct b43_wldev *dev,
ring = select_ring_by_priority(dev, i);
spin_lock_irqsave(&ring->lock, flags);
- stats[i].len = ring->used_slots / SLOTS_PER_PACKET;
- stats[i].limit = ring->nr_slots / SLOTS_PER_PACKET;
+ stats[i].len = ring->used_slots / TX_SLOTS_PER_FRAME;
+ stats[i].limit = ring->nr_slots / TX_SLOTS_PER_FRAME;
stats[i].count = ring->nr_tx_packets;
spin_unlock_irqrestore(&ring->lock, flags);
}
diff --git a/drivers/net/wireless/b43/dma.h b/drivers/net/wireless/b43/dma.h
index 4ec24e8f4fd7..05dde646d831 100644
--- a/drivers/net/wireless/b43/dma.h
+++ b/drivers/net/wireless/b43/dma.h
@@ -162,7 +162,7 @@ struct b43_dmadesc_generic {
#define B43_DMA0_RX_FRAMEOFFSET 30
/* DMA engine tuning knobs */
-#define B43_TXRING_SLOTS 128
+#define B43_TXRING_SLOTS 256
#define B43_RXRING_SLOTS 64
#define B43_DMA0_RX_BUFFERSIZE IEEE80211_MAX_FRAME_LEN
@@ -212,7 +212,7 @@ struct b43_dmaring {
void *descbase;
/* Meta data about all descriptors. */
struct b43_dmadesc_meta *meta;
- /* Cache of TX headers for each slot.
+ /* Cache of TX headers for each TX frame.
* This is to avoid an allocation on each TX.
* This is NULL for an RX ring.
*/