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-rw-r--r--target/linux/generic/pending-3.18/077-07-bgmac-simplify-rx-DMA-error-handling.patch130
1 files changed, 0 insertions, 130 deletions
diff --git a/target/linux/generic/pending-3.18/077-07-bgmac-simplify-rx-DMA-error-handling.patch b/target/linux/generic/pending-3.18/077-07-bgmac-simplify-rx-DMA-error-handling.patch
deleted file mode 100644
index 2be65b4544..0000000000
--- a/target/linux/generic/pending-3.18/077-07-bgmac-simplify-rx-DMA-error-handling.patch
+++ /dev/null
@@ -1,130 +0,0 @@
-From: Felix Fietkau <nbd@nbd.name>
-Date: Sun, 12 Apr 2015 22:23:07 +0200
-Subject: [PATCH] bgmac: simplify/optimize rx DMA error handling
-
-Allocate a new buffer before processing the completed one. If allocation
-fails, reuse the old buffer.
-
-Signed-off-by: Felix Fietkau <nbd@nbd.name>
----
-
---- a/drivers/net/ethernet/broadcom/bgmac.c
-+++ b/drivers/net/ethernet/broadcom/bgmac.c
-@@ -386,6 +386,19 @@ static void bgmac_dma_rx_setup_desc(stru
- dma_desc->ctl1 = cpu_to_le32(ctl1);
- }
-
-+static void bgmac_dma_rx_poison_buf(struct device *dma_dev,
-+ struct bgmac_slot_info *slot)
-+{
-+ struct bgmac_rx_header *rx = slot->buf + BGMAC_RX_BUF_OFFSET;
-+
-+ dma_sync_single_for_cpu(dma_dev, slot->dma_addr, BGMAC_RX_BUF_SIZE,
-+ DMA_FROM_DEVICE);
-+ rx->len = cpu_to_le16(0xdead);
-+ rx->flags = cpu_to_le16(0xbeef);
-+ dma_sync_single_for_device(dma_dev, slot->dma_addr, BGMAC_RX_BUF_SIZE,
-+ DMA_FROM_DEVICE);
-+}
-+
- static int bgmac_dma_rx_read(struct bgmac *bgmac, struct bgmac_dma_ring *ring,
- int weight)
- {
-@@ -406,53 +419,35 @@ static int bgmac_dma_rx_read(struct bgma
- struct bgmac_rx_header *rx = slot->buf + BGMAC_RX_BUF_OFFSET;
- struct sk_buff *skb;
- void *buf = slot->buf;
-+ dma_addr_t dma_addr = slot->dma_addr;
- u16 len, flags;
-
-- /* Unmap buffer to make it accessible to the CPU */
-- dma_sync_single_for_cpu(dma_dev, slot->dma_addr,
-- BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
--
-- /* Get info from the header */
-- len = le16_to_cpu(rx->len);
-- flags = le16_to_cpu(rx->flags);
--
- do {
-- dma_addr_t old_dma_addr = slot->dma_addr;
-- int err;
-+ /* Prepare new skb as replacement */
-+ if (bgmac_dma_rx_skb_for_slot(bgmac, slot)) {
-+ bgmac_dma_rx_poison_buf(dma_dev, slot);
-+ break;
-+ }
-+
-+ /* Unmap buffer to make it accessible to the CPU */
-+ dma_unmap_single(dma_dev, dma_addr,
-+ BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
-+
-+ /* Get info from the header */
-+ len = le16_to_cpu(rx->len);
-+ flags = le16_to_cpu(rx->flags);
-
- /* Check for poison and drop or pass the packet */
- if (len == 0xdead && flags == 0xbeef) {
- bgmac_err(bgmac, "Found poisoned packet at slot %d, DMA issue!\n",
- ring->start);
-- dma_sync_single_for_device(dma_dev,
-- slot->dma_addr,
-- BGMAC_RX_BUF_SIZE,
-- DMA_FROM_DEVICE);
-+ put_page(virt_to_head_page(buf));
- break;
- }
-
- /* Omit CRC. */
- len -= ETH_FCS_LEN;
-
-- /* Prepare new skb as replacement */
-- err = bgmac_dma_rx_skb_for_slot(bgmac, slot);
-- if (err) {
-- /* Poison the old skb */
-- rx->len = cpu_to_le16(0xdead);
-- rx->flags = cpu_to_le16(0xbeef);
--
-- dma_sync_single_for_device(dma_dev,
-- slot->dma_addr,
-- BGMAC_RX_BUF_SIZE,
-- DMA_FROM_DEVICE);
-- break;
-- }
-- bgmac_dma_rx_setup_desc(bgmac, ring, ring->start);
--
-- /* Unmap old skb, we'll pass it to the netfif */
-- dma_unmap_single(dma_dev, old_dma_addr,
-- BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
--
- skb = build_skb(buf, BGMAC_RX_ALLOC_SIZE);
- skb_put(skb, BGMAC_RX_FRAME_OFFSET +
- BGMAC_RX_BUF_OFFSET + len);
-@@ -465,6 +460,8 @@ static int bgmac_dma_rx_read(struct bgma
- handled++;
- } while (0);
-
-+ bgmac_dma_rx_setup_desc(bgmac, ring, ring->start);
-+
- if (++ring->start >= BGMAC_RX_RING_SLOTS)
- ring->start = 0;
-
-@@ -532,14 +529,14 @@ static void bgmac_dma_rx_ring_free(struc
-
- for (i = 0; i < ring->num_slots; i++) {
- slot = &ring->slots[i];
-- if (!slot->buf)
-+ if (!slot->dma_addr)
- continue;
-
-- if (slot->dma_addr)
-- dma_unmap_single(dma_dev, slot->dma_addr,
-- BGMAC_RX_BUF_SIZE,
-- DMA_FROM_DEVICE);
-+ dma_unmap_single(dma_dev, slot->dma_addr,
-+ BGMAC_RX_BUF_SIZE,
-+ DMA_FROM_DEVICE);
- put_page(virt_to_head_page(slot->buf));
-+ slot->dma_addr = 0;
- }
- }
-