mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-30 10:39:04 +00:00
85 lines
2.5 KiB
Diff
85 lines
2.5 KiB
Diff
From: Felix Fietkau <nbd@openwrt.org>
|
|
Date: Sun, 12 Apr 2015 11:59:47 +0200
|
|
Subject: [PATCH] bgmac: fix DMA rx corruption
|
|
|
|
The driver needs to inform the hardware about the first invalid (not yet
|
|
filled) rx slot, by writing its DMA descriptor pointer offset to the
|
|
BGMAC_DMA_RX_INDEX register.
|
|
|
|
This register was set to a value exceeding the rx ring size, effectively
|
|
allowing the hardware constant access to the full ring, regardless of
|
|
which slots are initialized.
|
|
|
|
Fix this by updating the register in bgmac_dma_rx_setup_desc.
|
|
|
|
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
|
|
---
|
|
|
|
--- a/drivers/net/ethernet/broadcom/bgmac.c
|
|
+++ b/drivers/net/ethernet/broadcom/bgmac.c
|
|
@@ -362,6 +362,16 @@ static int bgmac_dma_rx_skb_for_slot(str
|
|
return 0;
|
|
}
|
|
|
|
+static void bgmac_dma_rx_update_index(struct bgmac *bgmac,
|
|
+ struct bgmac_dma_ring *ring)
|
|
+{
|
|
+ wmb();
|
|
+
|
|
+ bgmac_write(bgmac, ring->mmio_base + BGMAC_DMA_RX_INDEX,
|
|
+ ring->index_base +
|
|
+ ring->end * sizeof(struct bgmac_dma_desc));
|
|
+}
|
|
+
|
|
static void bgmac_dma_rx_setup_desc(struct bgmac *bgmac,
|
|
struct bgmac_dma_ring *ring, int desc_idx)
|
|
{
|
|
@@ -380,6 +390,8 @@ static void bgmac_dma_rx_setup_desc(stru
|
|
dma_desc->addr_high = cpu_to_le32(upper_32_bits(ring->slots[desc_idx].dma_addr));
|
|
dma_desc->ctl0 = cpu_to_le32(ctl0);
|
|
dma_desc->ctl1 = cpu_to_le32(ctl1);
|
|
+
|
|
+ ring->end = (desc_idx + 1) % BGMAC_RX_RING_SLOTS;
|
|
}
|
|
|
|
static int bgmac_dma_rx_read(struct bgmac *bgmac, struct bgmac_dma_ring *ring,
|
|
@@ -394,9 +406,7 @@ static int bgmac_dma_rx_read(struct bgma
|
|
end_slot &= BGMAC_DMA_RX_STATDPTR;
|
|
end_slot /= sizeof(struct bgmac_dma_desc);
|
|
|
|
- ring->end = end_slot;
|
|
-
|
|
- while (ring->start != ring->end) {
|
|
+ while (ring->start != end_slot) {
|
|
struct device *dma_dev = bgmac->core->dma_dev;
|
|
struct bgmac_slot_info *slot = &ring->slots[ring->start];
|
|
struct bgmac_rx_header *rx = slot->buf + BGMAC_RX_BUF_OFFSET;
|
|
@@ -468,6 +478,8 @@ static int bgmac_dma_rx_read(struct bgma
|
|
break;
|
|
}
|
|
|
|
+ bgmac_dma_rx_update_index(bgmac, ring);
|
|
+
|
|
return handled;
|
|
}
|
|
|
|
@@ -690,15 +702,12 @@ static void bgmac_dma_init(struct bgmac
|
|
if (ring->unaligned)
|
|
bgmac_dma_rx_enable(bgmac, ring);
|
|
|
|
+ ring->start = 0;
|
|
+ ring->end = 0;
|
|
for (j = 0; j < ring->num_slots; j++)
|
|
bgmac_dma_rx_setup_desc(bgmac, ring, j);
|
|
|
|
- bgmac_write(bgmac, ring->mmio_base + BGMAC_DMA_RX_INDEX,
|
|
- ring->index_base +
|
|
- ring->num_slots * sizeof(struct bgmac_dma_desc));
|
|
-
|
|
- ring->start = 0;
|
|
- ring->end = 0;
|
|
+ bgmac_dma_rx_update_index(bgmac, ring);
|
|
}
|
|
}
|
|
|