diff options
Diffstat (limited to 'drivers/net/wireless/b43/dma.c')
| -rw-r--r-- | drivers/net/wireless/b43/dma.c | 106 |
1 files changed, 79 insertions, 27 deletions
diff --git a/drivers/net/wireless/b43/dma.c b/drivers/net/wireless/b43/dma.c index 38bc5a7997f..1d7982afc0a 100644 --- a/drivers/net/wireless/b43/dma.c +++ b/drivers/net/wireless/b43/dma.c @@ -419,8 +419,6 @@ static inline static int alloc_ringmemory(struct b43_dmaring *ring) { - gfp_t flags = GFP_KERNEL; - /* The specs call for 4K buffers for 30- and 32-bit DMA with 4K * alignment and 8K buffers for 64-bit DMA with 8K alignment. * In practice we could use smaller buffers for the latter, but the @@ -433,14 +431,11 @@ static int alloc_ringmemory(struct b43_dmaring *ring) u16 ring_mem_size = (ring->type == B43_DMA_64BIT) ? B43_DMA64_RINGMEMSIZE : B43_DMA32_RINGMEMSIZE; - ring->descbase = dma_alloc_coherent(ring->dev->dev->dma_dev, - ring_mem_size, &(ring->dmabase), - flags); - if (!ring->descbase) { - b43err(ring->dev->wl, "DMA ringmemory allocation failed\n"); + ring->descbase = dma_zalloc_coherent(ring->dev->dev->dma_dev, + ring_mem_size, &(ring->dmabase), + GFP_KERNEL); + if (!ring->descbase) return -ENOMEM; - } - memset(ring->descbase, 0, ring_mem_size); return 0; } @@ -1070,12 +1065,9 @@ static int b43_dma_set_mask(struct b43_wldev *dev, u64 mask) /* Try to set the DMA mask. If it fails, try falling back to a * lower mask, as we can always also support a lower one. */ while (1) { - err = dma_set_mask(dev->dev->dma_dev, mask); - if (!err) { - err = dma_set_coherent_mask(dev->dev->dma_dev, mask); - if (!err) - break; - } + err = dma_set_mask_and_coherent(dev->dev->dma_dev, mask); + if (!err) + break; if (mask == DMA_BIT_MASK(64)) { mask = DMA_BIT_MASK(32); fallback = true; @@ -1487,8 +1479,12 @@ void b43_dma_handle_txstatus(struct b43_wldev *dev, const struct b43_dma_ops *ops; struct b43_dmaring *ring; struct b43_dmadesc_meta *meta; + static const struct b43_txstatus fake; /* filled with 0 */ + const struct b43_txstatus *txstat; int slot, firstused; bool frame_succeed; + int skip; + static u8 err_out1, err_out2; ring = parse_cookie(dev, status->cookie, &slot); if (unlikely(!ring)) @@ -1501,13 +1497,36 @@ void b43_dma_handle_txstatus(struct b43_wldev *dev, firstused = ring->current_slot - ring->used_slots + 1; if (firstused < 0) firstused = ring->nr_slots + firstused; + + skip = 0; if (unlikely(slot != firstused)) { /* This possibly is a firmware bug and will result in - * malfunction, memory leaks and/or stall of DMA functionality. */ - b43dbg(dev->wl, "Out of order TX status report on DMA ring %d. " - "Expected %d, but got %d\n", - ring->index, firstused, slot); - return; + * malfunction, memory leaks and/or stall of DMA functionality. + */ + if (slot == next_slot(ring, next_slot(ring, firstused))) { + /* If a single header/data pair was missed, skip over + * the first two slots in an attempt to recover. + */ + slot = firstused; + skip = 2; + if (!err_out1) { + /* Report the error once. */ + b43dbg(dev->wl, + "Skip on DMA ring %d slot %d.\n", + ring->index, slot); + err_out1 = 1; + } + } else { + /* More than a single header/data pair were missed. + * Report this error once. + */ + if (!err_out2) + b43dbg(dev->wl, + "Out of order TX status report on DMA ring %d. Expected %d, but got %d\n", + ring->index, firstused, slot); + err_out2 = 1; + return; + } } ops = ring->ops; @@ -1522,11 +1541,13 @@ void b43_dma_handle_txstatus(struct b43_wldev *dev, slot, firstused, ring->index); break; } + if (meta->skb) { struct b43_private_tx_info *priv_info = - b43_get_priv_tx_info(IEEE80211_SKB_CB(meta->skb)); + b43_get_priv_tx_info(IEEE80211_SKB_CB(meta->skb)); - unmap_descbuffer(ring, meta->dmaaddr, meta->skb->len, 1); + unmap_descbuffer(ring, meta->dmaaddr, + meta->skb->len, 1); kfree(priv_info->bouncebuffer); priv_info->bouncebuffer = NULL; } else { @@ -1538,8 +1559,9 @@ void b43_dma_handle_txstatus(struct b43_wldev *dev, struct ieee80211_tx_info *info; if (unlikely(!meta->skb)) { - /* This is a scatter-gather fragment of a frame, so - * the skb pointer must not be NULL. */ + /* This is a scatter-gather fragment of a frame, + * so the skb pointer must not be NULL. + */ b43dbg(dev->wl, "TX status unexpected NULL skb " "at slot %d (first=%d) on ring %d\n", slot, firstused, ring->index); @@ -1550,9 +1572,18 @@ void b43_dma_handle_txstatus(struct b43_wldev *dev, /* * Call back to inform the ieee80211 subsystem about - * the status of the transmission. + * the status of the transmission. When skipping over + * a missed TX status report, use a status structure + * filled with zeros to indicate that the frame was not + * sent (frame_count 0) and not acknowledged */ - frame_succeed = b43_fill_txstatus_report(dev, info, status); + if (unlikely(skip)) + txstat = &fake; + else + txstat = status; + + frame_succeed = b43_fill_txstatus_report(dev, info, + txstat); #ifdef CONFIG_B43_DEBUG if (frame_succeed) ring->nr_succeed_tx_packets++; @@ -1580,12 +1611,14 @@ void b43_dma_handle_txstatus(struct b43_wldev *dev, /* Everything unmapped and free'd. So it's not used anymore. */ ring->used_slots--; - if (meta->is_last_fragment) { + if (meta->is_last_fragment && !skip) { /* This is the last scatter-gather * fragment of the frame. We are done. */ break; } slot = next_slot(ring, slot); + if (skip > 0) + --skip; } if (ring->stopped) { B43_WARN_ON(free_slots(ring) < TX_SLOTS_PER_FRAME); @@ -1692,6 +1725,25 @@ drop_recycle_buffer: sync_descbuffer_for_device(ring, dmaaddr, ring->rx_buffersize); } +void b43_dma_handle_rx_overflow(struct b43_dmaring *ring) +{ + int current_slot, previous_slot; + + B43_WARN_ON(ring->tx); + + /* Device has filled all buffers, drop all packets and let TCP + * decrease speed. + * Decrement RX index by one will let the device to see all slots + * as free again + */ + /* + *TODO: How to increase rx_drop in mac80211? + */ + current_slot = ring->ops->get_current_rxslot(ring); + previous_slot = prev_slot(ring, current_slot); + ring->ops->set_current_rxslot(ring, previous_slot); +} + void b43_dma_rx(struct b43_dmaring *ring) { const struct b43_dma_ops *ops = ring->ops; |