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kernel: bgmac: add more DMA related fixes

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

SVN-Revision: 45407
v19.07.3_mercusys_ac12_duma
Felix Fietkau 9 years ago
parent 09722d0bdc
commit afafbc0d74
8 changed files with 428 additions and 48 deletions
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68
target/linux/generic/patches-3.18/077-07-bgmac-simplify-rx-DMA-error-handling.patch
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@ -0,0 +1,68 @@
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.
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
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);
+ 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);
do {
- dma_addr_t old_dma_addr = slot->dma_addr;
int err;
/* 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);
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);
-
- 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 +
@@ -461,6 +446,8 @@ 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;

28
target/linux/generic/patches-3.18/077-08-bgmac-add-check-for-oversized-packets.patch
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@ -0,0 +1,28 @@
From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 12 Apr 2015 22:28:20 +0200
Subject: [PATCH] bgmac: add check for oversized packets
In very rare cases, the MAC can catch an internal buffer that is bigger
than it's supposed to be. Instead of crashing the kernel, simply pass
the buffer back to the hardware
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -422,6 +422,14 @@ static int bgmac_dma_rx_read(struct bgma
break;
}
+ if (len > BGMAC_RX_ALLOC_SIZE) {
+ bgmac_err(bgmac, "Found oversized packet at slot %d, DMA issue!\n",
+ ring->start);
+ rx->len = cpu_to_le16(0xdead);
+ rx->flags = cpu_to_le16(0xbeef);
+ break;
+ }
+
/* Omit CRC. */
len -= ETH_FCS_LEN;

23
target/linux/generic/patches-3.18/077-09-bgmac-increase-rx-ring-size-from-511-to-512.patch
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@ -0,0 +1,23 @@
From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 12 Apr 2015 22:36:16 +0200
Subject: [PATCH] bgmac: increase rx ring size from 511 to 512
Limiting it to 511 looks like a failed attempt at leaving one descriptor
empty to allow the hardware to stop processing a buffer that has not
been prepared yet. However, this doesn't work because this affects the
total ring size as well
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
--- a/drivers/net/ethernet/broadcom/bgmac.h
+++ b/drivers/net/ethernet/broadcom/bgmac.h
@@ -356,7 +356,7 @@
#define BGMAC_MAX_RX_RINGS 1
#define BGMAC_TX_RING_SLOTS 128
-#define BGMAC_RX_RING_SLOTS 512 - 1 /* Why -1? Well, Broadcom does that... */
+#define BGMAC_RX_RING_SLOTS 512
#define BGMAC_RX_HEADER_LEN 28 /* Last 24 bytes are unused. Well... */
#define BGMAC_RX_FRAME_OFFSET 30 /* There are 2 unused bytes between header and real data */

164
target/linux/generic/patches-3.18/077-10-bgmac-simplify-dma-init-cleanup.patch
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@ -0,0 +1,164 @@
From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 12 Apr 2015 23:19:32 +0200
Subject: [PATCH] bgmac: simplify dma init/cleanup
Instead of allocating buffers at device init time and initializing
descriptors at device open, do both at the same time (during open).
Free all buffers when closing the device.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -549,18 +549,26 @@ static void bgmac_dma_ring_desc_free(str
ring->dma_base);
}
-static void bgmac_dma_free(struct bgmac *bgmac)
+static void bgmac_dma_cleanup(struct bgmac *bgmac)
{
int i;
- for (i = 0; i < BGMAC_MAX_TX_RINGS; i++) {
+ for (i = 0; i < BGMAC_MAX_TX_RINGS; i++)
bgmac_dma_tx_ring_free(bgmac, &bgmac->tx_ring[i]);
- bgmac_dma_ring_desc_free(bgmac, &bgmac->tx_ring[i]);
- }
- for (i = 0; i < BGMAC_MAX_RX_RINGS; i++) {
+
+ for (i = 0; i < BGMAC_MAX_RX_RINGS; i++)
bgmac_dma_rx_ring_free(bgmac, &bgmac->rx_ring[i]);
+}
+
+static void bgmac_dma_free(struct bgmac *bgmac)
+{
+ int i;
+
+ for (i = 0; i < BGMAC_MAX_TX_RINGS; i++)
+ bgmac_dma_ring_desc_free(bgmac, &bgmac->tx_ring[i]);
+
+ for (i = 0; i < BGMAC_MAX_RX_RINGS; i++)
bgmac_dma_ring_desc_free(bgmac, &bgmac->rx_ring[i]);
- }
}
static int bgmac_dma_alloc(struct bgmac *bgmac)
@@ -608,8 +616,6 @@ static int bgmac_dma_alloc(struct bgmac
}
for (i = 0; i < BGMAC_MAX_RX_RINGS; i++) {
- int j;
-
ring = &bgmac->rx_ring[i];
ring->num_slots = BGMAC_RX_RING_SLOTS;
ring->mmio_base = ring_base[i];
@@ -632,15 +638,6 @@ static int bgmac_dma_alloc(struct bgmac
ring->index_base = lower_32_bits(ring->dma_base);
else
ring->index_base = 0;
-
- /* Alloc RX slots */
- for (j = 0; j < ring->num_slots; j++) {
- err = bgmac_dma_rx_skb_for_slot(bgmac, &ring->slots[j]);
- if (err) {
- bgmac_err(bgmac, "Can't allocate skb for slot in RX ring\n");
- goto err_dma_free;
- }
- }
}
return 0;
@@ -650,10 +647,10 @@ err_dma_free:
return -ENOMEM;
}
-static void bgmac_dma_init(struct bgmac *bgmac)
+static int bgmac_dma_init(struct bgmac *bgmac)
{
struct bgmac_dma_ring *ring;
- int i;
+ int i, err;
for (i = 0; i < BGMAC_MAX_TX_RINGS; i++) {
ring = &bgmac->tx_ring[i];
@@ -685,8 +682,13 @@ static void bgmac_dma_init(struct bgmac
if (ring->unaligned)
bgmac_dma_rx_enable(bgmac, ring);
- for (j = 0; j < ring->num_slots; j++)
+ for (j = 0; j < ring->num_slots; j++) {
+ err = bgmac_dma_rx_skb_for_slot(bgmac, &ring->slots[j]);
+ if (err)
+ return err;
+
bgmac_dma_rx_setup_desc(bgmac, ring, j);
+ }
bgmac_write(bgmac, ring->mmio_base + BGMAC_DMA_RX_INDEX,
ring->index_base +
@@ -695,6 +697,8 @@ static void bgmac_dma_init(struct bgmac
ring->start = 0;
ring->end = 0;
}
+
+ return 0;
}
/**************************************************
@@ -1170,11 +1174,8 @@ static void bgmac_enable(struct bgmac *b
}
/* http://bcm-v4.sipsolutions.net/mac-gbit/gmac/chipinit */
-static void bgmac_chip_init(struct bgmac *bgmac, bool full_init)
+static void bgmac_chip_init(struct bgmac *bgmac)
{
- struct bgmac_dma_ring *ring;
- int i;
-
/* 1 interrupt per received frame */
bgmac_write(bgmac, BGMAC_INT_RECV_LAZY, 1 << BGMAC_IRL_FC_SHIFT);
@@ -1192,16 +1193,7 @@ static void bgmac_chip_init(struct bgmac
bgmac_write(bgmac, BGMAC_RXMAX_LENGTH, 32 + ETHER_MAX_LEN);
- if (full_init) {
- bgmac_dma_init(bgmac);
- if (1) /* FIXME: is there any case we don't want IRQs? */
- bgmac_chip_intrs_on(bgmac);
- } else {
- for (i = 0; i < BGMAC_MAX_RX_RINGS; i++) {
- ring = &bgmac->rx_ring[i];
- bgmac_dma_rx_enable(bgmac, ring);
- }
- }
+ bgmac_chip_intrs_on(bgmac);
bgmac_enable(bgmac);
}
@@ -1261,8 +1253,15 @@ static int bgmac_open(struct net_device
int err = 0;
bgmac_chip_reset(bgmac);
+
+ err = bgmac_dma_init(bgmac);
+ if (err) {
+ bgmac_dma_cleanup(bgmac);
+ return err;
+ }
+
/* Specs say about reclaiming rings here, but we do that in DMA init */
- bgmac_chip_init(bgmac, true);
+ bgmac_chip_init(bgmac);
err = request_irq(bgmac->core->irq, bgmac_interrupt, IRQF_SHARED,
KBUILD_MODNAME, net_dev);
@@ -1293,6 +1292,7 @@ static int bgmac_stop(struct net_device
free_irq(bgmac->core->irq, net_dev);
bgmac_chip_reset(bgmac);
+ bgmac_dma_cleanup(bgmac);
return 0;
}

16
target/linux/generic/patches-3.18/077-07-bgmac-fix-DMA-rx-corruption.patch → target/linux/generic/patches-3.18/077-11-bgmac-fix-DMA-rx-corruption.patch
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@ -10,7 +10,7 @@ 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.
To fix this issue, always mark the last filled rx slot as invalid.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
@ -39,7 +39,7 @@ Signed-off-by: Felix Fietkau <nbd@openwrt.org>
dma_desc->ctl0 = cpu_to_le32(ctl0);
dma_desc->ctl1 = cpu_to_le32(ctl1);
+
+ ring->end = (desc_idx + 1) % BGMAC_RX_RING_SLOTS;
+ ring->end = desc_idx;
}
static int bgmac_dma_rx_read(struct bgmac *bgmac, struct bgmac_dma_ring *ring,
@ -54,7 +54,7 @@ Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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
@@ -463,6 +473,8 @@ static int bgmac_dma_rx_read(struct bgma
break;
}
@ -63,14 +63,18 @@ Signed-off-by: Felix Fietkau <nbd@openwrt.org>
return handled;
}
@@ -690,15 +702,12 @@ static void bgmac_dma_init(struct bgmac
@@ -682,6 +694,8 @@ static int 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++)
for (j = 0; j < ring->num_slots; j++) {
err = bgmac_dma_rx_skb_for_slot(bgmac, &ring->slots[j]);
if (err)
@@ -690,12 +704,7 @@ static int bgmac_dma_init(struct bgmac *
bgmac_dma_rx_setup_desc(bgmac, ring, j);
}
- bgmac_write(bgmac, ring->mmio_base + BGMAC_DMA_RX_INDEX,
- ring->index_base +
@ -80,5 +84,5 @@ Signed-off-by: Felix Fietkau <nbd@openwrt.org>
- ring->end = 0;
+ bgmac_dma_rx_update_index(bgmac, ring);
}
}
return 0;

132
target/linux/generic/patches-3.18/077-12-bgmac-drop-ring-num_slots.patch
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@ -0,0 +1,132 @@
From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 12 Apr 2015 23:28:38 +0200
Subject: [PATCH] bgmac: drop ring->num_slots
The ring size is always known at compile time, so make the code a bit
more efficient
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -123,7 +123,7 @@ bgmac_dma_tx_add_buf(struct bgmac *bgmac
struct bgmac_dma_desc *dma_desc;
u32 ctl1;
- if (i == ring->num_slots - 1)
+ if (i == BGMAC_TX_RING_SLOTS - 1)
ctl0 |= BGMAC_DESC_CTL0_EOT;
ctl1 = len & BGMAC_DESC_CTL1_LEN;
@@ -378,7 +378,7 @@ static void bgmac_dma_rx_setup_desc(stru
struct bgmac_dma_desc *dma_desc = ring->cpu_base + desc_idx;
u32 ctl0 = 0, ctl1 = 0;
- if (desc_idx == ring->num_slots - 1)
+ if (desc_idx == BGMAC_RX_RING_SLOTS - 1)
ctl0 |= BGMAC_DESC_CTL0_EOT;
ctl1 |= BGMAC_RX_BUF_SIZE & BGMAC_DESC_CTL1_LEN;
/* Is there any BGMAC device that requires extension? */
@@ -508,7 +508,7 @@ static void bgmac_dma_tx_ring_free(struc
struct bgmac_slot_info *slot;
int i;
- for (i = 0; i < ring->num_slots; i++) {
+ for (i = 0; i < BGMAC_TX_RING_SLOTS; i++) {
int len = dma_desc[i].ctl1 & BGMAC_DESC_CTL1_LEN;
slot = &ring->slots[i];
@@ -533,7 +533,7 @@ static void bgmac_dma_rx_ring_free(struc
struct bgmac_slot_info *slot;
int i;
- for (i = 0; i < ring->num_slots; i++) {
+ for (i = 0; i < BGMAC_RX_RING_SLOTS; i++) {
slot = &ring->slots[i];
if (!slot->buf)
continue;
@@ -547,7 +547,8 @@ static void bgmac_dma_rx_ring_free(struc
}
static void bgmac_dma_ring_desc_free(struct bgmac *bgmac,
- struct bgmac_dma_ring *ring)
+ struct bgmac_dma_ring *ring,
+ int num_slots)
{
struct device *dma_dev = bgmac->core->dma_dev;
int size;
@@ -556,7 +557,7 @@ static void bgmac_dma_ring_desc_free(str
return;
/* Free ring of descriptors */
- size = ring->num_slots * sizeof(struct bgmac_dma_desc);
+ size = num_slots * sizeof(struct bgmac_dma_desc);
dma_free_coherent(dma_dev, size, ring->cpu_base,
ring->dma_base);
}
@@ -577,10 +578,12 @@ static void bgmac_dma_free(struct bgmac
int i;
for (i = 0; i < BGMAC_MAX_TX_RINGS; i++)
- bgmac_dma_ring_desc_free(bgmac, &bgmac->tx_ring[i]);
+ bgmac_dma_ring_desc_free(bgmac, &bgmac->tx_ring[i],
+ BGMAC_TX_RING_SLOTS);
for (i = 0; i < BGMAC_MAX_RX_RINGS; i++)
- bgmac_dma_ring_desc_free(bgmac, &bgmac->rx_ring[i]);
+ bgmac_dma_ring_desc_free(bgmac, &bgmac->rx_ring[i],
+ BGMAC_RX_RING_SLOTS);
}
static int bgmac_dma_alloc(struct bgmac *bgmac)
@@ -603,11 +606,10 @@ static int bgmac_dma_alloc(struct bgmac
for (i = 0; i < BGMAC_MAX_TX_RINGS; i++) {
ring = &bgmac->tx_ring[i];
- ring->num_slots = BGMAC_TX_RING_SLOTS;
ring->mmio_base = ring_base[i];
/* Alloc ring of descriptors */
- size = ring->num_slots * sizeof(struct bgmac_dma_desc);
+ size = BGMAC_TX_RING_SLOTS * sizeof(struct bgmac_dma_desc);
ring->cpu_base = dma_zalloc_coherent(dma_dev, size,
&ring->dma_base,
GFP_KERNEL);
@@ -629,11 +631,10 @@ static int bgmac_dma_alloc(struct bgmac
for (i = 0; i < BGMAC_MAX_RX_RINGS; i++) {
ring = &bgmac->rx_ring[i];
- ring->num_slots = BGMAC_RX_RING_SLOTS;
ring->mmio_base = ring_base[i];
/* Alloc ring of descriptors */
- size = ring->num_slots * sizeof(struct bgmac_dma_desc);
+ size = BGMAC_RX_RING_SLOTS * sizeof(struct bgmac_dma_desc);
ring->cpu_base = dma_zalloc_coherent(dma_dev, size,
&ring->dma_base,
GFP_KERNEL);
@@ -696,7 +697,7 @@ static int bgmac_dma_init(struct bgmac *
ring->start = 0;
ring->end = 0;
- for (j = 0; j < ring->num_slots; j++) {
+ for (j = 0; j < BGMAC_RX_RING_SLOTS; j++) {
err = bgmac_dma_rx_skb_for_slot(bgmac, &ring->slots[j]);
if (err)
return err;
--- a/drivers/net/ethernet/broadcom/bgmac.h
+++ b/drivers/net/ethernet/broadcom/bgmac.h
@@ -419,11 +419,10 @@ struct bgmac_dma_ring {
u32 start;
u32 end;
- u16 num_slots;
- u16 mmio_base;
struct bgmac_dma_desc *cpu_base;
dma_addr_t dma_base;
u32 index_base; /* Used for unaligned rings only, otherwise 0 */
+ u16 mmio_base;
bool unaligned;
struct bgmac_slot_info slots[BGMAC_RX_RING_SLOTS];

6
target/linux/generic/patches-3.18/773-bgmac-add-srab-switch.patch
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@ -12,7 +12,7 @@ Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
#include <bcm47xx_nvram.h>
static const struct bcma_device_id bgmac_bcma_tbl[] = {
@@ -1538,6 +1539,17 @@ static void bgmac_mii_unregister(struct
@@ -1524,6 +1525,17 @@ static void bgmac_mii_unregister(struct
mdiobus_free(mii_bus);
}
@ -30,7 +30,7 @@ Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
/**************************************************
* BCMA bus ops
**************************************************/
@@ -1661,6 +1673,16 @@ static int bgmac_probe(struct bcma_devic
@@ -1647,6 +1659,16 @@ static int bgmac_probe(struct bcma_devic
net_dev->hw_features = net_dev->features;
net_dev->vlan_features = net_dev->features;
@ -47,7 +47,7 @@ Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
err = register_netdev(bgmac->net_dev);
if (err) {
bgmac_err(bgmac, "Cannot register net device\n");
@@ -1687,6 +1709,10 @@ static void bgmac_remove(struct bcma_dev
@@ -1673,6 +1695,10 @@ static void bgmac_remove(struct bcma_dev
{
struct bgmac *bgmac = bcma_get_drvdata(core);

39
target/linux/generic/patches-3.18/775-bgmac-check-length-of-received-frame.patch
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@ -1,39 +0,0 @@
From 2d12a9abf3f81de5b51852e3cfcba8cedac82642 Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Fri, 6 Dec 2013 01:14:52 +0100
Subject: [PATCH] bgmac: check length of received frame
---
drivers/net/ethernet/broadcom/bgmac.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -427,6 +427,27 @@ static int bgmac_dma_rx_read(struct bgma
dma_addr_t old_dma_addr = slot->dma_addr;
int err;
+ if (len > BGMAC_RX_MAX_FRAME_SIZE) {
+ struct bgmac_dma_desc *dma_desc = ring->cpu_base + ring->start;
+
+ bgmac_err(bgmac, "Hardware reported invalid packet length %d for slot %d!\n", len, ring->start);
+ bgmac_err(bgmac, "flags: 0x%04X\n", flags);
+ bgmac_err(bgmac, "ctl0: 0x%08X\tctl1: 0x%08X\n", le32_to_cpu(dma_desc->ctl0), le32_to_cpu(dma_desc->ctl1));
+
+ bgmac_err(bgmac, " BGMAC_DMA_RX_CTL: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_CTL));
+ bgmac_err(bgmac, " BGMAC_DMA_RX_INDEX: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_INDEX));
+ bgmac_err(bgmac, "BGMAC_DMA_RX_RINGLO: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_RINGLO));
+ bgmac_err(bgmac, "BGMAC_DMA_RX_RINGHI: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_RINGHI));
+ bgmac_err(bgmac, "BGMAC_DMA_RX_STATUS: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_STATUS));
+ bgmac_err(bgmac, " BGMAC_DMA_RX_ERROR: 0x%08X\n", bgmac_read(bgmac, ring->mmio_base + BGMAC_DMA_RX_ERROR));
+
+ dma_sync_single_for_device(dma_dev,
+ slot->dma_addr,
+ BGMAC_RX_BUF_SIZE,
+ DMA_FROM_DEVICE);
+ break;
+ }
+
/* 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",
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