mirror of
git://git.openwrt.org/openwrt/openwrt.git
synced 2025-10-24 18:44:27 -04:00
131 lines
3.7 KiB
Diff
131 lines
3.7 KiB
Diff
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;
|
|
}
|
|
}
|
|
|