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Date: Mon, 13 Apr 2015 19:27:42 +0200
From: Felix Fietkau <nbd@...nwrt.org>
To: netdev@...r.kernel.org
Cc: zajec5@...il.com, hauke@...ke-m.de
Subject: [PATCH v5 4/9] bgmac: simplify rx DMA error handling
Unmap the DMA buffer before checking it. If an error occurs, free the
buffer and allocate a new one. If allocation or mapping fails, retry as
long as there is NAPI poll budget left (count every attempt instead of
every frame).
Signed-off-by: Felix Fietkau <nbd@...nwrt.org>
---
drivers/net/ethernet/broadcom/bgmac.c | 56 +++++++++++++----------------------
1 file changed, 20 insertions(+), 36 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
index 9a6742e..1916ebc 100644
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -404,51 +404,33 @@ static int bgmac_dma_rx_read(struct bgmac *bgmac, struct bgmac_dma_ring *ring,
void *buf = slot->buf;
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);
+ if (++handled >= weight - 1) /* Should never be greater */
+ break;
do {
- dma_addr_t old_dma_addr = slot->dma_addr;
- int err;
+ if (!slot->dma_addr)
+ break;
+
+ /* Unmap buffer to make it accessible to the CPU */
+ dma_unmap_single(dma_dev, slot->dma_addr,
+ BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
+ slot->dma_addr = 0;
+
+ /* 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);
+ kfree(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);
@@ -458,14 +440,16 @@ static int bgmac_dma_rx_read(struct bgmac *bgmac, struct bgmac_dma_ring *ring,
skb_checksum_none_assert(skb);
skb->protocol = eth_type_trans(skb, bgmac->net_dev);
napi_gro_receive(&bgmac->napi, skb);
- handled++;
} while (0);
+ /* Prepare new skb as replacement */
+ if (bgmac_dma_rx_skb_for_slot(bgmac, slot))
+ continue;
+
+ bgmac_dma_rx_setup_desc(bgmac, ring, ring->start);
+
if (++ring->start >= BGMAC_RX_RING_SLOTS)
ring->start = 0;
-
- if (handled >= weight) /* Should never be greater */
- break;
}
return handled;
--
2.2.2
--
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