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kernel: sync bgmac changes with latest upstream submission

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Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 45420
This commit is contained in:
Felix Fietkau
2015-04-13 17:32:33 +00:00
parent 24e9f52106
commit 1bf8e555bb
8 changed files with 92 additions and 54 deletions
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73
target/linux/generic/patches-3.18/077-07-bgmac-simplify-rx-DMA-error-handling.patch
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@@ -2,30 +2,44 @@ From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 12 Apr 2015 22:23:07 +0200
Subject: [PATCH] bgmac: simplify rx DMA error handling
Unmap the DMA buffer before checking it. If it is poisoned, map it again
and pass it back to the hardware.
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@openwrt.org>
---
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -405,25 +405,20 @@ static int bgmac_dma_rx_read(struct bgma
@@ -404,51 +404,33 @@ static int bgmac_dma_rx_read(struct bgma
void *buf = slot->buf;
u16 len, flags;
/* Unmap buffer to make it accessible to the CPU */
- /* 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);
+ dma_unmap_single(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);
-
- /* 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;
- 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) {
@@ -35,34 +49,53 @@ Signed-off-by: Felix Fietkau <nbd@openwrt.org>
- slot->dma_addr,
- BGMAC_RX_BUF_SIZE,
- DMA_FROM_DEVICE);
+ kfree(buf);
break;
}
@@ -436,18 +431,8 @@ static int bgmac_dma_rx_read(struct bgma
/* Poison the old skb */
rx->len = cpu_to_le16(0xdead);
rx->flags = cpu_to_le16(0xbeef);
/* 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;
}
- 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 +
@@ -461,6 +446,8 @@ static int bgmac_dma_rx_read(struct bgma
handled++;
BGMAC_RX_BUF_OFFSET + len);
@@ -458,14 +440,16 @@ static int bgmac_dma_rx_read(struct bgma
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;