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-rw-r--r--target/linux/generic/patches-4.0/072-04-bgmac-simplify-tx-ring-index-handling.patch125
1 files changed, 0 insertions, 125 deletions
diff --git a/target/linux/generic/patches-4.0/072-04-bgmac-simplify-tx-ring-index-handling.patch b/target/linux/generic/patches-4.0/072-04-bgmac-simplify-tx-ring-index-handling.patch
deleted file mode 100644
index 241a3083a9..0000000000
--- a/target/linux/generic/patches-4.0/072-04-bgmac-simplify-tx-ring-index-handling.patch
+++ /dev/null
@@ -1,125 +0,0 @@
-From: Felix Fietkau <nbd@openwrt.org>
-Date: Sun, 12 Apr 2015 09:58:56 +0200
-Subject: [PATCH] bgmac: simplify tx ring index handling
-
-Keep incrementing ring->start and ring->end instead of pointing it to
-the actual ring slot entry. This simplifies the calculation of the
-number of free slots.
-
-Signed-off-by: Felix Fietkau <nbd@openwrt.org>
----
-
---- a/drivers/net/ethernet/broadcom/bgmac.c
-+++ b/drivers/net/ethernet/broadcom/bgmac.c
-@@ -142,11 +142,10 @@ static netdev_tx_t bgmac_dma_tx_add(stru
- {
- struct device *dma_dev = bgmac->core->dma_dev;
- struct net_device *net_dev = bgmac->net_dev;
-- struct bgmac_slot_info *slot = &ring->slots[ring->end];
-- int free_slots;
-+ int index = ring->end % BGMAC_TX_RING_SLOTS;
-+ struct bgmac_slot_info *slot = &ring->slots[index];
- int nr_frags;
- u32 flags;
-- int index = ring->end;
- int i;
-
- if (skb->len > BGMAC_DESC_CTL1_LEN) {
-@@ -159,12 +158,10 @@ static netdev_tx_t bgmac_dma_tx_add(stru
-
- nr_frags = skb_shinfo(skb)->nr_frags;
-
-- if (ring->start <= ring->end)
-- free_slots = ring->start - ring->end + BGMAC_TX_RING_SLOTS;
-- else
-- free_slots = ring->start - ring->end;
--
-- if (free_slots <= nr_frags + 1) {
-+ /* ring->end - ring->start will return the number of valid slots,
-+ * even when ring->end overflows
-+ */
-+ if (ring->end - ring->start + nr_frags + 1 >= BGMAC_TX_RING_SLOTS) {
- bgmac_err(bgmac, "TX ring is full, queue should be stopped!\n");
- netif_stop_queue(net_dev);
- return NETDEV_TX_BUSY;
-@@ -200,7 +197,7 @@ static netdev_tx_t bgmac_dma_tx_add(stru
- }
-
- slot->skb = skb;
--
-+ ring->end += nr_frags + 1;
- netdev_sent_queue(net_dev, skb->len);
-
- wmb();
-@@ -208,13 +205,12 @@ static netdev_tx_t bgmac_dma_tx_add(stru
- /* Increase ring->end to point empty slot. We tell hardware the first
- * slot it should *not* read.
- */
-- ring->end = (index + 1) % BGMAC_TX_RING_SLOTS;
- bgmac_write(bgmac, ring->mmio_base + BGMAC_DMA_TX_INDEX,
- ring->index_base +
-- ring->end * sizeof(struct bgmac_dma_desc));
-+ (ring->end % BGMAC_TX_RING_SLOTS) *
-+ sizeof(struct bgmac_dma_desc));
-
-- free_slots -= nr_frags + 1;
-- if (free_slots < 8)
-+ if (ring->end - ring->start >= BGMAC_TX_RING_SLOTS - 8)
- netif_stop_queue(net_dev);
-
- return NETDEV_TX_OK;
-@@ -256,17 +252,17 @@ static void bgmac_dma_tx_free(struct bgm
- empty_slot &= BGMAC_DMA_TX_STATDPTR;
- empty_slot /= sizeof(struct bgmac_dma_desc);
-
-- while (ring->start != empty_slot) {
-- struct bgmac_slot_info *slot = &ring->slots[ring->start];
-- u32 ctl1 = le32_to_cpu(ring->cpu_base[ring->start].ctl1);
-- int len = ctl1 & BGMAC_DESC_CTL1_LEN;
-+ while (ring->start != ring->end) {
-+ int slot_idx = ring->start % BGMAC_TX_RING_SLOTS;
-+ struct bgmac_slot_info *slot = &ring->slots[slot_idx];
-+ u32 ctl1;
-+ int len;
-
-- if (!slot->dma_addr) {
-- bgmac_err(bgmac, "Hardware reported transmission for empty TX ring slot %d! End of ring: %d\n",
-- ring->start, ring->end);
-- goto next;
-- }
-+ if (slot_idx == empty_slot)
-+ break;
-
-+ ctl1 = le32_to_cpu(ring->cpu_base[slot_idx].ctl1);
-+ len = ctl1 & BGMAC_DESC_CTL1_LEN;
- if (ctl1 & BGMAC_DESC_CTL0_SOF)
- /* Unmap no longer used buffer */
- dma_unmap_single(dma_dev, slot->dma_addr, len,
-@@ -284,10 +280,8 @@ static void bgmac_dma_tx_free(struct bgm
- slot->skb = NULL;
- }
-
--next:
- slot->dma_addr = 0;
-- if (++ring->start >= BGMAC_TX_RING_SLOTS)
-- ring->start = 0;
-+ ring->start++;
- freed = true;
- }
-
---- a/drivers/net/ethernet/broadcom/bgmac.h
-+++ b/drivers/net/ethernet/broadcom/bgmac.h
-@@ -414,10 +414,10 @@ enum bgmac_dma_ring_type {
- * empty.
- */
- struct bgmac_dma_ring {
-- u16 num_slots;
-- u16 start;
-- u16 end;
-+ u32 start;
-+ u32 end;
-
-+ u16 num_slots;
- u16 mmio_base;
- struct bgmac_dma_desc *cpu_base;
- dma_addr_t dma_base;