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path: root/drivers/net/wireless/b43/dma.c
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Diffstat (limited to 'drivers/net/wireless/b43/dma.c')
-rw-r--r--drivers/net/wireless/b43/dma.c65
1 files changed, 36 insertions, 29 deletions
diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c
index 6d65a02b7052..0cc804d0a214 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,
@@ -74,8 +80,7 @@ static void op32_fill_descriptor(struct b43_dmaring *ring,
addrext = (u32) (dmaaddr & SSB_DMA_TRANSLATION_MASK)
>> SSB_DMA_TRANSLATION_SHIFT;
addr |= ssb_dma_translation(ring->dev->dev);
- ctl = (bufsize - ring->frameoffset)
- & B43_DMA32_DCTL_BYTECNT;
+ ctl = bufsize & B43_DMA32_DCTL_BYTECNT;
if (slot == ring->nr_slots - 1)
ctl |= B43_DMA32_DCTL_DTABLEEND;
if (start)
@@ -177,8 +182,7 @@ static void op64_fill_descriptor(struct b43_dmaring *ring,
ctl0 |= B43_DMA64_DCTL0_FRAMEEND;
if (irq)
ctl0 |= B43_DMA64_DCTL0_IRQ;
- ctl1 |= (bufsize - ring->frameoffset)
- & B43_DMA64_DCTL1_BYTECNT;
+ ctl1 |= bufsize & B43_DMA64_DCTL1_BYTECNT;
ctl1 |= (addrext << B43_DMA64_DCTL1_ADDREXT_SHIFT)
& B43_DMA64_DCTL1_ADDREXT_MASK;
@@ -576,12 +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;
@@ -830,9 +833,6 @@ struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev,
if (ring->index == 0) {
ring->rx_buffersize = B43_DMA0_RX_BUFFERSIZE;
ring->frameoffset = B43_DMA0_RX_FRAMEOFFSET;
- } else if (ring->index == 3) {
- ring->rx_buffersize = B43_DMA3_RX_BUFFERSIZE;
- ring->frameoffset = B43_DMA3_RX_FRAMEOFFSET;
} else
B43_WARN_ON(1);
}
@@ -842,7 +842,10 @@ struct b43_dmaring *b43_setup_dmaring(struct b43_wldev *dev,
#endif
if (for_tx) {
- ring->txhdr_cache = kcalloc(ring->nr_slots,
+ /* Assumption: B43_TXRING_SLOTS can be divided by TX_SLOTS_PER_FRAME */
+ BUILD_BUG_ON(B43_TXRING_SLOTS % TX_SLOTS_PER_FRAME != 0);
+
+ ring->txhdr_cache = kcalloc(ring->nr_slots / TX_SLOTS_PER_FRAME,
b43_txhdr_size(dev),
GFP_KERNEL);
if (!ring->txhdr_cache)
@@ -858,7 +861,7 @@ 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)
@@ -1149,7 +1152,10 @@ 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;
@@ -1159,7 +1165,7 @@ 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);
@@ -1254,8 +1260,8 @@ static inline int should_inject_overflow(struct b43_dmaring *ring)
}
/* Static mapping of mac80211's queues (priorities) to b43 DMA rings. */
-static struct b43_dmaring * select_ring_by_priority(struct b43_wldev *dev,
- u8 queue_prio)
+static struct b43_dmaring *select_ring_by_priority(struct b43_wldev *dev,
+ u8 queue_prio)
{
struct b43_dmaring *ring;
@@ -1306,17 +1312,19 @@ int b43_dma_tx(struct b43_wldev *dev, struct sk_buff *skb)
}
spin_lock_irqsave(&ring->lock, flags);
+
B43_WARN_ON(!ring->tx);
- if (unlikely(free_slots(ring) < SLOTS_PER_PACKET)) {
- b43warn(dev->wl, "DMA queue overflow\n");
- err = -ENOSPC;
- goto out_unlock;
- }
/* Check if the queue was stopped in mac80211,
* but we got called nevertheless.
* That would be a mac80211 bug. */
B43_WARN_ON(ring->stopped);
+ if (unlikely(free_slots(ring) < TX_SLOTS_PER_FRAME)) {
+ b43warn(dev->wl, "DMA queue overflow\n");
+ err = -ENOSPC;
+ goto out_unlock;
+ }
+
/* Assign the queue number to the ring (if not already done before)
* so TX status handling can use it. The queue to ring mapping is
* static, so we don't need to store it per frame. */
@@ -1335,7 +1343,7 @@ 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));
@@ -1417,9 +1425,8 @@ void b43_dma_handle_txstatus(struct b43_wldev *dev,
break;
slot = next_slot(ring, slot);
}
- 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)) {
@@ -1442,8 +1449,8 @@ 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);
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.