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stmmac: do not perform zero-copy for rx frames

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This patch is to allow this driver to copy tiny frames during the reception
process. This is giving more stability while stressing the driver on STi
embedded systems.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Giuseppe Cavallaro 2016-02-29 14:27:41 +01:00 committed by David S. Miller
parent 8ecd80a5f6
commit 22ad383815
3 changed files with 86 additions and 15 deletions
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1
drivers/net/ethernet/stmicro/stmmac/stmmac.h
View File

@ -74,6 +74,7 @@ struct stmmac_priv {
unsigned int cur_rx;
unsigned int dirty_rx;
unsigned int dma_buf_sz;
unsigned int rx_copybreak;
u32 rx_riwt;
int hwts_rx_en;
dma_addr_t *rx_skbuff_dma;

39
drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
View File

@ -781,6 +781,43 @@ static int stmmac_get_ts_info(struct net_device *dev,
return ethtool_op_get_ts_info(dev, info);
}
static int stmmac_get_tunable(struct net_device *dev,
const struct ethtool_tunable *tuna, void *data)
{
struct stmmac_priv *priv = netdev_priv(dev);
int ret = 0;
switch (tuna->id) {
case ETHTOOL_RX_COPYBREAK:
*(u32 *)data = priv->rx_copybreak;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int stmmac_set_tunable(struct net_device *dev,
const struct ethtool_tunable *tuna,
const void *data)
{
struct stmmac_priv *priv = netdev_priv(dev);
int ret = 0;
switch (tuna->id) {
case ETHTOOL_RX_COPYBREAK:
priv->rx_copybreak = *(u32 *)data;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static const struct ethtool_ops stmmac_ethtool_ops = {
.begin = stmmac_check_if_running,
.get_drvinfo = stmmac_ethtool_getdrvinfo,
@ -803,6 +840,8 @@ static const struct ethtool_ops stmmac_ethtool_ops = {
.get_ts_info = stmmac_get_ts_info,
.get_coalesce = stmmac_get_coalesce,
.set_coalesce = stmmac_set_coalesce,
.get_tunable = stmmac_get_tunable,
.set_tunable = stmmac_set_tunable,
};
void stmmac_set_ethtool_ops(struct net_device *netdev)

61
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View File

@ -91,6 +91,8 @@ static int buf_sz = DEFAULT_BUFSIZE;
module_param(buf_sz, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(buf_sz, "DMA buffer size");
#define STMMAC_RX_COPYBREAK 256
static const u32 default_msg_level = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
NETIF_MSG_LINK | NETIF_MSG_IFUP |
NETIF_MSG_IFDOWN | NETIF_MSG_TIMER);
@ -1808,6 +1810,7 @@ static int stmmac_open(struct net_device *dev)
priv->xstats.threshold = tc;
priv->dma_buf_sz = STMMAC_ALIGN(buf_sz);
priv->rx_copybreak = STMMAC_RX_COPYBREAK;
ret = alloc_dma_desc_resources(priv);
if (ret < 0) {
@ -2159,8 +2162,7 @@ static inline void stmmac_rx_refill(struct stmmac_priv *priv)
struct sk_buff *skb;
skb = netdev_alloc_skb_ip_align(priv->dev, bfsize);
if (unlikely(skb == NULL))
if (unlikely(!skb))
break;
priv->rx_skbuff[entry] = skb;
@ -2282,23 +2284,52 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit)
pr_debug("\tframe size %d, COE: %d\n",
frame_len, status);
}
skb = priv->rx_skbuff[entry];
if (unlikely(!skb)) {
pr_err("%s: Inconsistent Rx descriptor chain\n",
priv->dev->name);
priv->dev->stats.rx_dropped++;
break;
if (unlikely(frame_len < priv->rx_copybreak)) {
skb = netdev_alloc_skb_ip_align(priv->dev,
frame_len);
if (unlikely(!skb)) {
if (net_ratelimit())
dev_warn(priv->device,
"packet dropped\n");
priv->dev->stats.rx_dropped++;
break;
}
dma_sync_single_for_cpu(priv->device,
priv->rx_skbuff_dma
[entry], frame_len,
DMA_FROM_DEVICE);
skb_copy_to_linear_data(skb,
priv->
rx_skbuff[entry]->data,
frame_len);
skb_put(skb, frame_len);
dma_sync_single_for_device(priv->device,
priv->rx_skbuff_dma
[entry], frame_len,
DMA_FROM_DEVICE);
} else {
skb = priv->rx_skbuff[entry];
if (unlikely(!skb)) {
pr_err("%s: Inconsistent Rx chain\n",
priv->dev->name);
priv->dev->stats.rx_dropped++;
break;
}
prefetch(skb->data - NET_IP_ALIGN);
priv->rx_skbuff[entry] = NULL;
skb_put(skb, frame_len);
dma_unmap_single(priv->device,
priv->rx_skbuff_dma[entry],
priv->dma_buf_sz,
DMA_FROM_DEVICE);
}
prefetch(skb->data - NET_IP_ALIGN);
priv->rx_skbuff[entry] = NULL;
stmmac_get_rx_hwtstamp(priv, entry, skb);
skb_put(skb, frame_len);
dma_unmap_single(priv->device,
priv->rx_skbuff_dma[entry],
priv->dma_buf_sz, DMA_FROM_DEVICE);
if (netif_msg_pktdata(priv)) {
pr_debug("frame received (%dbytes)", frame_len);
print_pkt(skb->data, frame_len);