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bcm63xx: sync ethernet driver with net-next

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Sync ethernet driver code with upstream Linux kernel:
-Reduce xmit_more code changes.
-Combine rx cleanup code into a function.
-Convert to build_skb.
-Improve rx loop by optimizing loop tracking.

https://lore.kernel.org/netdev/20210106144208.1935-1-liew.s.piaw@gmail.com/
Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
[Amend commit description, move patches to the top since they are going to be
upstreamed]
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
This commit is contained in:
Sieng Piaw Liew 2021-01-12 10:35:55 +08:00 committed by Álvaro Fernández Rojas
parent 2d8422842c
commit 1d6f422e34
15 changed files with 703 additions and 191 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
target/linux/bcm63xx/patches-5.4/440-bcm63xx_enet-batch_process_RX_path.patch → target/linux/bcm63xx/patches-5.4/040-v5.12-bcm63xx_enet-batch-process-rx-path.patch
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@ -1,43 +1,45 @@
From 1606f78dc82e4f311ca5844a0605a62cd141a072 Mon Sep 17 00:00:00 2001
From 9cbfea02c1dbee0afb9128f065e6e793672b9ff7 Mon Sep 17 00:00:00 2001
From: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Date: Mon, 30 Nov 2020 11:07:47 +0800
Subject: [PATCH] bcm63xx: batch process RX path
Date: Wed, 6 Jan 2021 22:42:02 +0800
Subject: [PATCH 1/7] bcm63xx_enet: batch process rx path
Use netif_receive_skb_list to batch process skb in RX.
Use netif_receive_skb_list to batch process rx skb.
Tested on BCM6328 320 MHz using iperf3 -M 512, increasing performance
by 12.5%.
Before:
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-30.00 sec 120 MBytes 33.7 Mbits/sec 277 sender
[ 4] 0.00-30.00 sec 120 MBytes 33.5 Mbits/sec receiver
[ 4] 0.00-30.00 sec 120 MBytes 33.7 Mbits/sec 277 sender
[ 4] 0.00-30.00 sec 120 MBytes 33.5 Mbits/sec receiver
After:
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-30.00 sec 136 MBytes 37.9 Mbits/sec 203 sender
[ 4] 0.00-30.00 sec 135 MBytes 37.7 Mbits/sec receiver
[ 4] 0.00-30.00 sec 136 MBytes 37.9 Mbits/sec 203 sender
[ 4] 0.00-30.00 sec 135 MBytes 37.7 Mbits/sec receiver
Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/ethernet/broadcom/bcm63xx_enet.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -301,10 +301,12 @@ static int bcm_enet_receive_queue(struct
@@ -298,10 +298,12 @@ static void bcm_enet_refill_rx_timer(str
static int bcm_enet_receive_queue(struct net_device *dev, int budget)
{
struct bcm_enet_priv *priv;
+ struct list_head rx_list;
struct device *kdev;
int processed;
+ struct list_head rx_list;
priv = netdev_priv(dev);
+ INIT_LIST_HEAD(&rx_list);
kdev = &priv->pdev->dev;
processed = 0;
+ INIT_LIST_HEAD(&rx_list);
/* don't scan ring further than number of refilled
* descriptor */
@@ -393,10 +395,12 @@ static int bcm_enet_receive_queue(struct
@@ -392,10 +394,12 @@ static int bcm_enet_receive_queue(struct
skb->protocol = eth_type_trans(skb, dev);
dev->stats.rx_packets++;
dev->stats.rx_bytes += len;

68
target/linux/bcm63xx/patches-5.4/041-v5.12-bcm63xx_enet-add-BQL-support.patch Normal file
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@ -0,0 +1,68 @@
From 4c59b0f5543db80abbbe9efdd9b25e7899501db5 Mon Sep 17 00:00:00 2001
From: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Date: Wed, 6 Jan 2021 22:42:03 +0800
Subject: [PATCH 2/7] bcm63xx_enet: add BQL support
Add Byte Queue Limits support to reduce/remove bufferbloat in
bcm63xx_enet.
Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/ethernet/broadcom/bcm63xx_enet.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -418,9 +418,11 @@ static int bcm_enet_receive_queue(struct
static int bcm_enet_tx_reclaim(struct net_device *dev, int force)
{
struct bcm_enet_priv *priv;
+ unsigned int bytes;
int released;
priv = netdev_priv(dev);
+ bytes = 0;
released = 0;
while (priv->tx_desc_count < priv->tx_ring_size) {
@@ -457,10 +459,13 @@ static int bcm_enet_tx_reclaim(struct ne
if (desc->len_stat & DMADESC_UNDER_MASK)
dev->stats.tx_errors++;
+ bytes += skb->len;
dev_kfree_skb(skb);
released++;
}
+ netdev_completed_queue(dev, released, bytes);
+
if (netif_queue_stopped(dev) && released)
netif_wake_queue(dev);
@@ -627,6 +632,8 @@ bcm_enet_start_xmit(struct sk_buff *skb,
desc->len_stat = len_stat;
wmb();
+ netdev_sent_queue(dev, skb->len);
+
/* kick tx dma */
enet_dmac_writel(priv, priv->dma_chan_en_mask,
ENETDMAC_CHANCFG, priv->tx_chan);
@@ -1170,6 +1177,7 @@ static int bcm_enet_stop(struct net_devi
kdev = &priv->pdev->dev;
netif_stop_queue(dev);
+ netdev_reset_queue(dev);
napi_disable(&priv->napi);
if (priv->has_phy)
phy_stop(dev->phydev);
@@ -2343,6 +2351,7 @@ static int bcm_enetsw_stop(struct net_de
del_timer_sync(&priv->swphy_poll);
netif_stop_queue(dev);
+ netdev_reset_queue(dev);
napi_disable(&priv->napi);
del_timer_sync(&priv->rx_timeout);

26
target/linux/bcm63xx/patches-5.4/042-v5.12-bcm63xx_enet-add-xmit_more-support.patch Normal file
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@ -0,0 +1,26 @@
From 375281d3a6dcabaa98f489ee412aedca6d99dffb Mon Sep 17 00:00:00 2001
From: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Date: Wed, 6 Jan 2021 22:42:04 +0800
Subject: [PATCH 3/7] bcm63xx_enet: add xmit_more support
Support bulking hardware TX queue by using netdev_xmit_more().
Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/ethernet/broadcom/bcm63xx_enet.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -635,7 +635,8 @@ bcm_enet_start_xmit(struct sk_buff *skb,
netdev_sent_queue(dev, skb->len);
/* kick tx dma */
- enet_dmac_writel(priv, priv->dma_chan_en_mask,
+ if (!netdev_xmit_more() || !priv->tx_desc_count)
+ enet_dmac_writel(priv, priv->dma_chan_en_mask,
ENETDMAC_CHANCFG, priv->tx_chan);
/* stop queue if no more desc available */

45
target/linux/bcm63xx/patches-5.4/043-v5.12-bcm63xx_enet-alloc-rx-skb-with-NET_IP_ALIGN.patch Normal file
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@ -0,0 +1,45 @@
From c4a207865e7ea310dc146ff4aa1b0aa0c78d3fe1 Mon Sep 17 00:00:00 2001
From: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Date: Wed, 6 Jan 2021 22:42:05 +0800
Subject: [PATCH 4/7] bcm63xx_enet: alloc rx skb with NET_IP_ALIGN
Use netdev_alloc_skb_ip_align on newer SoCs with integrated switch
(enetsw) when refilling RX. Increases packet processing performance
by 30% (with netif_receive_skb_list).
Non-enetsw SoCs cannot function with the extra pad so continue to use
the regular netdev_alloc_skb.
Tested on BCM6328 320 MHz and iperf3 -M 512 to measure packet/sec
performance.
Before:
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-30.00 sec 120 MBytes 33.7 Mbits/sec 277 sender
[ 4] 0.00-30.00 sec 120 MBytes 33.5 Mbits/sec receiver
After (+netif_receive_skb_list):
[ 4] 0.00-30.00 sec 155 MBytes 43.3 Mbits/sec 354 sender
[ 4] 0.00-30.00 sec 154 MBytes 43.1 Mbits/sec receiver
Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/ethernet/broadcom/bcm63xx_enet.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -238,7 +238,10 @@ static int bcm_enet_refill_rx(struct net
desc = &priv->rx_desc_cpu[desc_idx];
if (!priv->rx_skb[desc_idx]) {
- skb = netdev_alloc_skb(dev, priv->rx_skb_size);
+ if (priv->enet_is_sw)
+ skb = netdev_alloc_skb_ip_align(dev, priv->rx_skb_size);
+ else
+ skb = netdev_alloc_skb(dev, priv->rx_skb_size);
if (!skb)
break;
priv->rx_skb[desc_idx] = skb;

142
target/linux/bcm63xx/patches-5.4/044-v5.12-bcm63xx_enet-consolidate-rx-SKB-ring-cleanup-code.patch Normal file
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@ -0,0 +1,142 @@
From 3d0b72654b0c8304424503e7560ee8635dd56340 Mon Sep 17 00:00:00 2001
From: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Date: Wed, 6 Jan 2021 22:42:06 +0800
Subject: [PATCH 5/7] bcm63xx_enet: consolidate rx SKB ring cleanup code
The rx SKB ring use the same code for cleanup at various points.
Combine them into a function to reduce lines of code.
Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/ethernet/broadcom/bcm63xx_enet.c | 72 ++++++--------------
1 file changed, 22 insertions(+), 50 deletions(-)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -861,6 +861,24 @@ static void bcm_enet_adjust_link(struct
priv->pause_tx ? "tx" : "off");
}
+static void bcm_enet_free_rx_skb_ring(struct device *kdev, struct bcm_enet_priv *priv)
+{
+ int i;
+
+ for (i = 0; i < priv->rx_ring_size; i++) {
+ struct bcm_enet_desc *desc;
+
+ if (!priv->rx_skb[i])
+ continue;
+
+ desc = &priv->rx_desc_cpu[i];
+ dma_unmap_single(kdev, desc->address, priv->rx_skb_size,
+ DMA_FROM_DEVICE);
+ kfree_skb(priv->rx_skb[i]);
+ }
+ kfree(priv->rx_skb);
+}
+
/*
* open callback, allocate dma rings & buffers and start rx operation
*/
@@ -1085,18 +1103,7 @@ static int bcm_enet_open(struct net_devi
return 0;
out:
- for (i = 0; i < priv->rx_ring_size; i++) {
- struct bcm_enet_desc *desc;
-
- if (!priv->rx_skb[i])
- continue;
-
- desc = &priv->rx_desc_cpu[i];
- dma_unmap_single(kdev, desc->address, priv->rx_skb_size,
- DMA_FROM_DEVICE);
- kfree_skb(priv->rx_skb[i]);
- }
- kfree(priv->rx_skb);
+ bcm_enet_free_rx_skb_ring(kdev, priv);
out_free_tx_skb:
kfree(priv->tx_skb);
@@ -1175,7 +1182,6 @@ static int bcm_enet_stop(struct net_devi
{
struct bcm_enet_priv *priv;
struct device *kdev;
- int i;
priv = netdev_priv(dev);
kdev = &priv->pdev->dev;
@@ -1204,20 +1210,9 @@ static int bcm_enet_stop(struct net_devi
bcm_enet_tx_reclaim(dev, 1);
/* free the rx skb ring */
- for (i = 0; i < priv->rx_ring_size; i++) {
- struct bcm_enet_desc *desc;
-
- if (!priv->rx_skb[i])
- continue;
-
- desc = &priv->rx_desc_cpu[i];
- dma_unmap_single(kdev, desc->address, priv->rx_skb_size,
- DMA_FROM_DEVICE);
- kfree_skb(priv->rx_skb[i]);
- }
+ bcm_enet_free_rx_skb_ring(kdev, priv);
/* free remaining allocated memory */
- kfree(priv->rx_skb);
kfree(priv->tx_skb);
dma_free_coherent(kdev, priv->rx_desc_alloc_size,
priv->rx_desc_cpu, priv->rx_desc_dma);
@@ -2308,18 +2303,7 @@ static int bcm_enetsw_open(struct net_de
return 0;
out:
- for (i = 0; i < priv->rx_ring_size; i++) {
- struct bcm_enet_desc *desc;
-
- if (!priv->rx_skb[i])
- continue;
-
- desc = &priv->rx_desc_cpu[i];
- dma_unmap_single(kdev, desc->address, priv->rx_skb_size,
- DMA_FROM_DEVICE);
- kfree_skb(priv->rx_skb[i]);
- }
- kfree(priv->rx_skb);
+ bcm_enet_free_rx_skb_ring(kdev, priv);
out_free_tx_skb:
kfree(priv->tx_skb);
@@ -2348,7 +2332,6 @@ static int bcm_enetsw_stop(struct net_de
{
struct bcm_enet_priv *priv;
struct device *kdev;
- int i;
priv = netdev_priv(dev);
kdev = &priv->pdev->dev;
@@ -2371,20 +2354,9 @@ static int bcm_enetsw_stop(struct net_de
bcm_enet_tx_reclaim(dev, 1);
/* free the rx skb ring */
- for (i = 0; i < priv->rx_ring_size; i++) {
- struct bcm_enet_desc *desc;
-
- if (!priv->rx_skb[i])
- continue;
-
- desc = &priv->rx_desc_cpu[i];
- dma_unmap_single(kdev, desc->address, priv->rx_skb_size,
- DMA_FROM_DEVICE);
- kfree_skb(priv->rx_skb[i]);
- }
+ bcm_enet_free_rx_skb_ring(kdev, priv);
/* free remaining allocated memory */
- kfree(priv->rx_skb);
kfree(priv->tx_skb);
dma_free_coherent(kdev, priv->rx_desc_alloc_size,
priv->rx_desc_cpu, priv->rx_desc_dma);

347
target/linux/bcm63xx/patches-5.4/045-v5.12-bcm63xx_enet-convert-to-build_skb.patch Normal file
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@ -0,0 +1,347 @@
From d27de0ef5ef995df2cc5f5c006c0efcf0a62b6af Mon Sep 17 00:00:00 2001
From: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Date: Wed, 6 Jan 2021 22:42:07 +0800
Subject: [PATCH 6/7] bcm63xx_enet: convert to build_skb
We can increase the efficiency of rx path by using buffers to receive
packets then build SKBs around them just before passing into the network
stack. In contrast, preallocating SKBs too early reduces CPU cache
efficiency.
Check if we're in NAPI context when refilling RX. Normally we're almost
always running in NAPI context. Dispatch to napi_alloc_frag directly
instead of relying on netdev_alloc_frag which does the same but
with the overhead of local_bh_disable/enable.
Tested on BCM6328 320 MHz and iperf3 -M 512 to measure packet/sec
performance. Included netif_receive_skb_list and NET_IP_ALIGN
optimizations.
Before:
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 49.9 MBytes 41.9 Mbits/sec 197 sender
[ 4] 0.00-10.00 sec 49.3 MBytes 41.3 Mbits/sec receiver
After:
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-30.00 sec 171 MBytes 47.8 Mbits/sec 272 sender
[ 4] 0.00-30.00 sec 170 MBytes 47.6 Mbits/sec receiver
Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/ethernet/broadcom/bcm63xx_enet.c | 111 ++++++++++---------
drivers/net/ethernet/broadcom/bcm63xx_enet.h | 14 ++-
2 files changed, 71 insertions(+), 54 deletions(-)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -221,7 +221,7 @@ static void bcm_enet_mdio_write_mii(stru
/*
* refill rx queue
*/
-static int bcm_enet_refill_rx(struct net_device *dev)
+static int bcm_enet_refill_rx(struct net_device *dev, bool napi_mode)
{
struct bcm_enet_priv *priv;
@@ -229,29 +229,29 @@ static int bcm_enet_refill_rx(struct net
while (priv->rx_desc_count < priv->rx_ring_size) {
struct bcm_enet_desc *desc;
- struct sk_buff *skb;
- dma_addr_t p;
int desc_idx;
u32 len_stat;
desc_idx = priv->rx_dirty_desc;
desc = &priv->rx_desc_cpu[desc_idx];
- if (!priv->rx_skb[desc_idx]) {
- if (priv->enet_is_sw)
- skb = netdev_alloc_skb_ip_align(dev, priv->rx_skb_size);
+ if (!priv->rx_buf[desc_idx]) {
+ void *buf;
+
+ if (likely(napi_mode))
+ buf = napi_alloc_frag(priv->rx_frag_size);
else
- skb = netdev_alloc_skb(dev, priv->rx_skb_size);
- if (!skb)
+ buf = netdev_alloc_frag(priv->rx_frag_size);
+ if (unlikely(!buf))
break;
- priv->rx_skb[desc_idx] = skb;
- p = dma_map_single(&priv->pdev->dev, skb->data,
- priv->rx_skb_size,
- DMA_FROM_DEVICE);
- desc->address = p;
+ priv->rx_buf[desc_idx] = buf;
+ desc->address = dma_map_single(&priv->pdev->dev,
+ buf + priv->rx_buf_offset,
+ priv->rx_buf_size,
+ DMA_FROM_DEVICE);
}
- len_stat = priv->rx_skb_size << DMADESC_LENGTH_SHIFT;
+ len_stat = priv->rx_buf_size << DMADESC_LENGTH_SHIFT;
len_stat |= DMADESC_OWNER_MASK;
if (priv->rx_dirty_desc == priv->rx_ring_size - 1) {
len_stat |= (DMADESC_WRAP_MASK >> priv->dma_desc_shift);
@@ -291,7 +291,7 @@ static void bcm_enet_refill_rx_timer(str
struct net_device *dev = priv->net_dev;
spin_lock(&priv->rx_lock);
- bcm_enet_refill_rx(dev);
+ bcm_enet_refill_rx(dev, false);
spin_unlock(&priv->rx_lock);
}
@@ -321,6 +321,7 @@ static int bcm_enet_receive_queue(struct
int desc_idx;
u32 len_stat;
unsigned int len;
+ void *buf;
desc_idx = priv->rx_curr_desc;
desc = &priv->rx_desc_cpu[desc_idx];
@@ -366,16 +367,14 @@ static int bcm_enet_receive_queue(struct
}
/* valid packet */
- skb = priv->rx_skb[desc_idx];
+ buf = priv->rx_buf[desc_idx];
len = (len_stat & DMADESC_LENGTH_MASK) >> DMADESC_LENGTH_SHIFT;
/* don't include FCS */
len -= 4;
if (len < copybreak) {
- struct sk_buff *nskb;
-
- nskb = napi_alloc_skb(&priv->napi, len);
- if (!nskb) {
+ skb = napi_alloc_skb(&priv->napi, len);
+ if (unlikely(!skb)) {
/* forget packet, just rearm desc */
dev->stats.rx_dropped++;
continue;
@@ -383,14 +382,21 @@ static int bcm_enet_receive_queue(struct
dma_sync_single_for_cpu(kdev, desc->address,
len, DMA_FROM_DEVICE);
- memcpy(nskb->data, skb->data, len);
+ memcpy(skb->data, buf + priv->rx_buf_offset, len);
dma_sync_single_for_device(kdev, desc->address,
len, DMA_FROM_DEVICE);
- skb = nskb;
} else {
- dma_unmap_single(&priv->pdev->dev, desc->address,
- priv->rx_skb_size, DMA_FROM_DEVICE);
- priv->rx_skb[desc_idx] = NULL;
+ dma_unmap_single(kdev, desc->address,
+ priv->rx_buf_size, DMA_FROM_DEVICE);
+ priv->rx_buf[desc_idx] = NULL;
+
+ skb = build_skb(buf, priv->rx_frag_size);
+ if (unlikely(!skb)) {
+ skb_free_frag(buf);
+ dev->stats.rx_dropped++;
+ continue;
+ }
+ skb_reserve(skb, priv->rx_buf_offset);
}
skb_put(skb, len);
@@ -404,7 +410,7 @@ static int bcm_enet_receive_queue(struct
netif_receive_skb_list(&rx_list);
if (processed || !priv->rx_desc_count) {
- bcm_enet_refill_rx(dev);
+ bcm_enet_refill_rx(dev, true);
/* kick rx dma */
enet_dmac_writel(priv, priv->dma_chan_en_mask,
@@ -861,22 +867,22 @@ static void bcm_enet_adjust_link(struct
priv->pause_tx ? "tx" : "off");
}
-static void bcm_enet_free_rx_skb_ring(struct device *kdev, struct bcm_enet_priv *priv)
+static void bcm_enet_free_rx_buf_ring(struct device *kdev, struct bcm_enet_priv *priv)
{
int i;
for (i = 0; i < priv->rx_ring_size; i++) {
struct bcm_enet_desc *desc;
- if (!priv->rx_skb[i])
+ if (!priv->rx_buf[i])
continue;
desc = &priv->rx_desc_cpu[i];
- dma_unmap_single(kdev, desc->address, priv->rx_skb_size,
+ dma_unmap_single(kdev, desc->address, priv->rx_buf_size,
DMA_FROM_DEVICE);
- kfree_skb(priv->rx_skb[i]);
+ skb_free_frag(priv->rx_buf[i]);
}
- kfree(priv->rx_skb);
+ kfree(priv->rx_buf);
}
/*
@@ -988,10 +994,10 @@ static int bcm_enet_open(struct net_devi
priv->tx_curr_desc = 0;
spin_lock_init(&priv->tx_lock);
- /* init & fill rx ring with skbs */
- priv->rx_skb = kcalloc(priv->rx_ring_size, sizeof(struct sk_buff *),
+ /* init & fill rx ring with buffers */
+ priv->rx_buf = kcalloc(priv->rx_ring_size, sizeof(void *),
GFP_KERNEL);
- if (!priv->rx_skb) {
+ if (!priv->rx_buf) {
ret = -ENOMEM;
goto out_free_tx_skb;
}
@@ -1008,8 +1014,8 @@ static int bcm_enet_open(struct net_devi
enet_dmac_writel(priv, ENETDMA_BUFALLOC_FORCE_MASK | 0,
ENETDMAC_BUFALLOC, priv->rx_chan);
- if (bcm_enet_refill_rx(dev)) {
- dev_err(kdev, "cannot allocate rx skb queue\n");
+ if (bcm_enet_refill_rx(dev, false)) {
+ dev_err(kdev, "cannot allocate rx buffer queue\n");
ret = -ENOMEM;
goto out;
}
@@ -1103,7 +1109,7 @@ static int bcm_enet_open(struct net_devi
return 0;
out:
- bcm_enet_free_rx_skb_ring(kdev, priv);
+ bcm_enet_free_rx_buf_ring(kdev, priv);
out_free_tx_skb:
kfree(priv->tx_skb);
@@ -1209,8 +1215,8 @@ static int bcm_enet_stop(struct net_devi
/* force reclaim of all tx buffers */
bcm_enet_tx_reclaim(dev, 1);
- /* free the rx skb ring */
- bcm_enet_free_rx_skb_ring(kdev, priv);
+ /* free the rx buffer ring */
+ bcm_enet_free_rx_buf_ring(kdev, priv);
/* free remaining allocated memory */
kfree(priv->tx_skb);
@@ -1637,9 +1643,12 @@ static int bcm_enet_change_mtu(struct ne
* align rx buffer size to dma burst len, account FCS since
* it's appended
*/
- priv->rx_skb_size = ALIGN(actual_mtu + ETH_FCS_LEN,
+ priv->rx_buf_size = ALIGN(actual_mtu + ETH_FCS_LEN,
priv->dma_maxburst * 4);
+ priv->rx_frag_size = SKB_DATA_ALIGN(priv->rx_buf_offset + priv->rx_buf_size) +
+ SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
+
dev->mtu = new_mtu;
return 0;
}
@@ -1725,6 +1734,7 @@ static int bcm_enet_probe(struct platfor
priv->enet_is_sw = false;
priv->dma_maxburst = BCMENET_DMA_MAXBURST;
+ priv->rx_buf_offset = NET_SKB_PAD;
ret = bcm_enet_change_mtu(dev, dev->mtu);
if (ret)
@@ -2142,7 +2152,7 @@ static int bcm_enetsw_open(struct net_de
priv->tx_skb = kcalloc(priv->tx_ring_size, sizeof(struct sk_buff *),
GFP_KERNEL);
if (!priv->tx_skb) {
- dev_err(kdev, "cannot allocate rx skb queue\n");
+ dev_err(kdev, "cannot allocate tx skb queue\n");
ret = -ENOMEM;
goto out_free_tx_ring;
}
@@ -2152,11 +2162,11 @@ static int bcm_enetsw_open(struct net_de
priv->tx_curr_desc = 0;
spin_lock_init(&priv->tx_lock);
- /* init & fill rx ring with skbs */
- priv->rx_skb = kcalloc(priv->rx_ring_size, sizeof(struct sk_buff *),
+ /* init & fill rx ring with buffers */
+ priv->rx_buf = kcalloc(priv->rx_ring_size, sizeof(void *),
GFP_KERNEL);
- if (!priv->rx_skb) {
- dev_err(kdev, "cannot allocate rx skb queue\n");
+ if (!priv->rx_buf) {
+ dev_err(kdev, "cannot allocate rx buffer queue\n");
ret = -ENOMEM;
goto out_free_tx_skb;
}
@@ -2203,8 +2213,8 @@ static int bcm_enetsw_open(struct net_de
enet_dma_writel(priv, ENETDMA_BUFALLOC_FORCE_MASK | 0,
ENETDMA_BUFALLOC_REG(priv->rx_chan));
- if (bcm_enet_refill_rx(dev)) {
- dev_err(kdev, "cannot allocate rx skb queue\n");
+ if (bcm_enet_refill_rx(dev, false)) {
+ dev_err(kdev, "cannot allocate rx buffer queue\n");
ret = -ENOMEM;
goto out;
}
@@ -2303,7 +2313,7 @@ static int bcm_enetsw_open(struct net_de
return 0;
out:
- bcm_enet_free_rx_skb_ring(kdev, priv);
+ bcm_enet_free_rx_buf_ring(kdev, priv);
out_free_tx_skb:
kfree(priv->tx_skb);
@@ -2353,8 +2363,8 @@ static int bcm_enetsw_stop(struct net_de
/* force reclaim of all tx buffers */
bcm_enet_tx_reclaim(dev, 1);
- /* free the rx skb ring */
- bcm_enet_free_rx_skb_ring(kdev, priv);
+ /* free the rx buffer ring */
+ bcm_enet_free_rx_buf_ring(kdev, priv);
/* free remaining allocated memory */
kfree(priv->tx_skb);
@@ -2655,6 +2665,7 @@ static int bcm_enetsw_probe(struct platf
priv->rx_ring_size = BCMENET_DEF_RX_DESC;
priv->tx_ring_size = BCMENET_DEF_TX_DESC;
priv->dma_maxburst = BCMENETSW_DMA_MAXBURST;
+ priv->rx_buf_offset = NET_SKB_PAD + NET_IP_ALIGN;
pd = dev_get_platdata(&pdev->dev);
if (pd) {
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.h
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.h
@@ -230,11 +230,17 @@ struct bcm_enet_priv {
/* next dirty rx descriptor to refill */
int rx_dirty_desc;
- /* size of allocated rx skbs */
- unsigned int rx_skb_size;
+ /* size of allocated rx buffers */
+ unsigned int rx_buf_size;
- /* list of skb given to hw for rx */
- struct sk_buff **rx_skb;
+ /* allocated rx buffer offset */
+ unsigned int rx_buf_offset;
+
+ /* size of allocated rx frag */
+ unsigned int rx_frag_size;
+
+ /* list of buffer given to hw for rx */
+ void **rx_buf;
/* used when rx skb allocation failed, so we defer rx queue
* refill */

40
target/linux/bcm63xx/patches-5.4/046-v5.12-bcm63xx_enet-improve-rx-loop.patch Normal file
View File

@ -0,0 +1,40 @@
From ae2259eebeacb7753e3043278957b45840123972 Mon Sep 17 00:00:00 2001
From: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Date: Wed, 6 Jan 2021 22:42:08 +0800
Subject: [PATCH 7/7] bcm63xx_enet: improve rx loop
Use existing rx processed count to track against budget, thereby making
budget decrement operation redundant.
rx_desc_count can be calculated outside the rx loop, making the loop a
bit smaller.
Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/ethernet/broadcom/bcm63xx_enet.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -340,7 +340,6 @@ static int bcm_enet_receive_queue(struct
priv->rx_curr_desc++;
if (priv->rx_curr_desc == priv->rx_ring_size)
priv->rx_curr_desc = 0;
- priv->rx_desc_count--;
/* if the packet does not have start of packet _and_
* end of packet flag set, then just recycle it */
@@ -405,9 +404,10 @@ static int bcm_enet_receive_queue(struct
dev->stats.rx_bytes += len;
list_add_tail(&skb->list, &rx_list);
- } while (--budget > 0);
+ } while (processed < budget);
netif_receive_skb_list(&rx_list);
+ priv->rx_desc_count -= processed;
if (processed || !priv->rx_desc_count) {
bcm_enet_refill_rx(dev, true);

2
target/linux/bcm63xx/patches-5.4/402_bcm63xx_enet_vlan_incoming_fixed.patch
View File

@ -1,6 +1,6 @@
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -1612,7 +1612,7 @@ static int bcm_enet_change_mtu(struct ne
@@ -1629,7 +1629,7 @@ static int bcm_enet_change_mtu(struct ne
return -EBUSY;
/* add ethernet header + vlan tag size */

22
target/linux/bcm63xx/patches-5.4/404-NET-bcm63xx_enet-move-phy_-dis-connect-into-probe-re.patch
View File

@ -15,7 +15,7 @@ Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -854,10 +854,8 @@ static int bcm_enet_open(struct net_devi
@@ -893,10 +893,8 @@ static int bcm_enet_open(struct net_devi
struct bcm_enet_priv *priv;
struct sockaddr addr;
struct device *kdev;
@ -26,7 +26,7 @@ Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
void *p;
u32 val;
@@ -865,31 +863,10 @@ static int bcm_enet_open(struct net_devi
@@ -904,31 +902,10 @@ static int bcm_enet_open(struct net_devi
kdev = &priv->pdev->dev;
if (priv->has_phy) {
@ -59,7 +59,7 @@ Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
}
/* mask all interrupts and request them */
@@ -899,7 +876,7 @@ static int bcm_enet_open(struct net_devi
@@ -938,7 +915,7 @@ static int bcm_enet_open(struct net_devi
ret = request_irq(dev->irq, bcm_enet_isr_mac, 0, dev->name, dev);
if (ret)
@ -68,7 +68,7 @@ Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
ret = request_irq(priv->irq_rx, bcm_enet_isr_dma, 0,
dev->name, dev);
@@ -1061,8 +1038,8 @@ static int bcm_enet_open(struct net_devi
@@ -1100,8 +1077,8 @@ static int bcm_enet_open(struct net_devi
enet_dmac_writel(priv, priv->dma_chan_int_mask,
ENETDMAC_IRMASK, priv->tx_chan);
@ -79,7 +79,7 @@ Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
else
bcm_enet_adjust_link(dev);
@@ -1103,10 +1080,6 @@ out_freeirq_rx:
@@ -1131,10 +1108,6 @@ out_freeirq_rx:
out_freeirq:
free_irq(dev->irq, dev);
@ -90,7 +90,7 @@ Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
return ret;
}
@@ -1211,10 +1184,6 @@ static int bcm_enet_stop(struct net_devi
@@ -1228,10 +1201,6 @@ static int bcm_enet_stop(struct net_devi
free_irq(priv->irq_rx, dev);
free_irq(dev->irq, dev);
@ -101,7 +101,7 @@ Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
return 0;
}
@@ -1779,14 +1748,47 @@ static int bcm_enet_probe(struct platfor
@@ -1800,14 +1769,47 @@ static int bcm_enet_probe(struct platfor
/* do minimal hardware init to be able to probe mii bus */
bcm_enet_hw_preinit(priv);
@ -150,7 +150,7 @@ Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
}
bus = priv->mii_bus;
@@ -1810,6 +1812,26 @@ static int bcm_enet_probe(struct platfor
@@ -1831,6 +1833,26 @@ static int bcm_enet_probe(struct platfor
dev_err(&pdev->dev, "unable to register mdio bus\n");
goto out_free_mdio;
}
@ -177,7 +177,7 @@ Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
} else {
/* run platform code to initialize PHY device */
@@ -1817,45 +1839,16 @@ static int bcm_enet_probe(struct platfor
@@ -1838,45 +1860,16 @@ static int bcm_enet_probe(struct platfor
pd->mii_config(dev, 1, bcm_enet_mdio_read_mii,
bcm_enet_mdio_write_mii)) {
dev_err(&pdev->dev, "unable to configure mdio bus\n");
@ -227,7 +227,7 @@ Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
if (priv->mii_bus)
mdiobus_unregister(priv->mii_bus);
@@ -1863,6 +1856,9 @@ out_free_mdio:
@@ -1884,6 +1877,9 @@ out_free_mdio:
if (priv->mii_bus)
mdiobus_free(priv->mii_bus);
@ -237,7 +237,7 @@ Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
out_uninit_hw:
/* turn off mdc clock */
enet_writel(priv, 0, ENET_MIISC_REG);
@@ -1893,6 +1889,7 @@ static int bcm_enet_remove(struct platfo
@@ -1914,6 +1910,7 @@ static int bcm_enet_remove(struct platfo
enet_writel(priv, 0, ENET_MIISC_REG);
if (priv->has_phy) {

2
target/linux/bcm63xx/patches-5.4/408-bcm63xx_enet-enable-rgmii-clock-on-external-ports.patch
View File

@ -32,7 +32,7 @@ Subject: [PATCH 54/81] bcm63xx_enet: enable rgmii clock on external ports
#define ENETSW_MDIOC_EXT_MASK (1 << 16)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -2162,6 +2162,18 @@ static int bcm_enetsw_open(struct net_de
@@ -2183,6 +2183,18 @@ static int bcm_enetsw_open(struct net_de
priv->sw_port_link[i] = 0;
}

10
target/linux/bcm63xx/patches-5.4/423-bcm63xx_enet_add_b53_support.patch
View File

@ -1,6 +1,6 @@
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.h
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.h
@@ -332,6 +332,9 @@ struct bcm_enet_priv {
@@ -338,6 +338,9 @@ struct bcm_enet_priv {
struct bcm63xx_enetsw_port used_ports[ENETSW_MAX_PORT];
int sw_port_link[ENETSW_MAX_PORT];
@ -20,7 +20,7 @@
#include <bcm63xx_dev_enet.h>
#include "bcm63xx_enet.h"
@@ -1909,7 +1910,8 @@ static int bcm_enet_remove(struct platfo
@@ -1930,7 +1931,8 @@ static int bcm_enet_remove(struct platfo
return 0;
}
@ -30,7 +30,7 @@
.probe = bcm_enet_probe,
.remove = bcm_enet_remove,
.driver = {
@@ -1918,6 +1920,42 @@ struct platform_driver bcm63xx_enet_driv
@@ -1939,6 +1941,42 @@ struct platform_driver bcm63xx_enet_driv
},
};
@ -73,7 +73,7 @@
/*
* switch mii access callbacks
*/
@@ -2174,29 +2212,6 @@ static int bcm_enetsw_open(struct net_de
@@ -2195,29 +2233,6 @@ static int bcm_enetsw_open(struct net_de
enetsw_writeb(priv, rgmii_ctrl, ENETSW_RGMII_CTRL_REG(i));
}
@ -103,7 +103,7 @@
/* initialize flow control buffer allocation */
enet_dma_writel(priv, ENETDMA_BUFALLOC_FORCE_MASK | 0,
ENETDMA_BUFALLOC_REG(priv->rx_chan));
@@ -2652,6 +2667,9 @@ static int bcm_enetsw_probe(struct platf
@@ -2651,6 +2666,9 @@ static int bcm_enetsw_probe(struct platf
struct bcm63xx_enetsw_platform_data *pd;
struct resource *res_mem;
int ret, irq_rx, irq_tx;

2
target/linux/bcm63xx/patches-5.4/428-bcm63xx_enet-rgmii-ctrl-fix.patch
View File

@ -12,7 +12,7 @@
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -2209,6 +2209,10 @@ static int bcm_enetsw_open(struct net_de
@@ -2230,6 +2230,10 @@ static int bcm_enetsw_open(struct net_de
rgmii_ctrl = enetsw_readb(priv, ENETSW_RGMII_CTRL_REG(i));
rgmii_ctrl |= ENETSW_RGMII_CTRL_GMII_CLK_EN;

37
target/linux/bcm63xx/patches-5.4/441-bcm63xx_enet-alloc_rx_skb_ip_align.patch
View File

@ -1,37 +0,0 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Date: Mon, 30 Nov 2020 11:07:47 +0800
Subject: [PATCH] bcm63xx: enetsw: switch to netdev_alloc_skb_ip_align
Increases packet processing performance by 30%.
Tested on BCM6328 320 MHz and iperf3 -M 512 for packet/sec performance.
Before:
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-30.00 sec 120 MBytes 33.7 Mbits/sec 277 sender
[ 4] 0.00-30.00 sec 120 MBytes 33.5 Mbits/sec receiver
After:
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-30.00 sec 155 MBytes 43.3 Mbits/sec 354 sender
[ 4] 0.00-30.00 sec 154 MBytes 43.1 Mbits/sec receiver
Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
---
drivers/net/ethernet/broadcom/bcm63xx_enet.c | 6 +++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -239,7 +239,10 @@ static int bcm_enet_refill_rx(struct net
desc = &priv->rx_desc_cpu[desc_idx];
if (!priv->rx_skb[desc_idx]) {
- skb = netdev_alloc_skb(dev, priv->rx_skb_size);
+ if (priv->enet_is_sw)
+ skb = netdev_alloc_skb_ip_align(dev, priv->rx_skb_size);
+ else
+ skb = netdev_alloc_skb(dev, priv->rx_skb_size);
if (!skb)
break;
priv->rx_skb[desc_idx] = skb;

67
target/linux/bcm63xx/patches-5.4/442-bcm63xx_enet-add_bql_support.patch
View File

@ -1,67 +0,0 @@
From 3c0e8e1259d223a1493c47f7e277d05b93909b6b Mon Sep 17 00:00:00 2001
From: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Date: Mon, 2 Nov 2020 11:34:06 +0800
Subject: [PATCH 1/2] bcm63xx: add BQL support
Add Byte Queue Limits support to reduce/remove bufferbloat in bcm63xx target.
Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
---
bcm63xx_enet.c | 11 +++++++++++
1 file changed, 11 insertions(+)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -423,9 +423,11 @@ static int bcm_enet_tx_reclaim(struct ne
{
struct bcm_enet_priv *priv;
int released;
+ unsigned int bytes;
priv = netdev_priv(dev);
released = 0;
+ bytes = 0;
while (priv->tx_desc_count < priv->tx_ring_size) {
struct bcm_enet_desc *desc;
@@ -461,10 +463,13 @@ static int bcm_enet_tx_reclaim(struct ne
if (desc->len_stat & DMADESC_UNDER_MASK)
dev->stats.tx_errors++;
+ bytes += skb->len;
dev_kfree_skb(skb);
released++;
}
+ netdev_completed_queue(dev, released, bytes);
+
if (netif_queue_stopped(dev) && released)
netif_wake_queue(dev);
@@ -631,6 +636,8 @@ bcm_enet_start_xmit(struct sk_buff *skb,
desc->len_stat = len_stat;
wmb();
+ netdev_sent_queue(dev, skb->len);
+
/* kick tx dma */
enet_dmac_writel(priv, priv->dma_chan_en_mask,
ENETDMAC_CHANCFG, priv->tx_chan);
@@ -1051,6 +1058,8 @@ static int bcm_enet_open(struct net_devi
else
bcm_enet_adjust_link(dev);
+ netdev_reset_queue(dev);
+
netif_start_queue(dev);
return 0;
@@ -2281,6 +2290,8 @@ static int bcm_enetsw_open(struct net_de
enet_dmac_writel(priv, ENETDMAC_IR_PKTDONE_MASK,
ENETDMAC_IRMASK, priv->tx_chan);
+ netdev_reset_queue(dev);
+
netif_carrier_on(dev);
netif_start_queue(dev);

54
target/linux/bcm63xx/patches-5.4/443-bcm63xx_enet-support_xmit_more_in_bql.patch
View File

@ -1,54 +0,0 @@
From 79bfb73319098bc4cb701139a6677dcdec99182f Mon Sep 17 00:00:00 2001
From: Sieng Piaw Liew <liew.s.piaw@gmail.com>
Date: Tue, 3 Nov 2020 08:14:35 +0800
Subject: [PATCH 2/2] bcm63xx: support xmit_more in BQL
Support bulking hardware TX queue by using xmit_more.
Signed-off-by: Sieng Piaw Liew <liew.s.piaw@gmail.com>
---
bcm63xx_enet.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -638,14 +638,16 @@ bcm_enet_start_xmit(struct sk_buff *skb,
netdev_sent_queue(dev, skb->len);
- /* kick tx dma */
- enet_dmac_writel(priv, priv->dma_chan_en_mask,
- ENETDMAC_CHANCFG, priv->tx_chan);
-
/* stop queue if no more desc available */
if (!priv->tx_desc_count)
netif_stop_queue(dev);
+ /* kick tx dma */
+ if(!netdev_xmit_more() || !priv->tx_desc_count)
+ enet_dmac_writel(priv, priv->dma_chan_en_mask,
+ ENETDMAC_CHANCFG, priv->tx_chan);
+
+
dev->stats.tx_bytes += skb->len;
dev->stats.tx_packets++;
ret = NETDEV_TX_OK;
@@ -2713,7 +2715,7 @@ static int bcm_enetsw_probe(struct platf
priv->irq_rx = irq_rx;
priv->irq_tx = irq_tx;
priv->rx_ring_size = BCMENET_DEF_RX_DESC;
- priv->tx_ring_size = BCMENET_DEF_TX_DESC;
+ priv->tx_ring_size = BCMENETSW_DEF_TX_DESC;
priv->dma_maxburst = BCMENETSW_DMA_MAXBURST;
pd = dev_get_platdata(&pdev->dev);
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.h
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.h
@@ -15,6 +15,7 @@
/* default number of descriptor */
#define BCMENET_DEF_RX_DESC 64
#define BCMENET_DEF_TX_DESC 32
+#define BCMENETSW_DEF_TX_DESC 48
/* maximum burst len for dma (4 bytes unit) */
#define BCMENET_DMA_MAXBURST 16