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path: root/drivers/net/ethernet/lantiq_xrx200.c
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Diffstat (limited to 'drivers/net/ethernet/lantiq_xrx200.c')
-rw-r--r--drivers/net/ethernet/lantiq_xrx200.c107
1 files changed, 79 insertions, 28 deletions
diff --git a/drivers/net/ethernet/lantiq_xrx200.c b/drivers/net/ethernet/lantiq_xrx200.c
index 80bfaf2fec92..41d11137cde0 100644
--- a/drivers/net/ethernet/lantiq_xrx200.c
+++ b/drivers/net/ethernet/lantiq_xrx200.c
@@ -27,6 +27,9 @@
#define XRX200_DMA_TX 1
#define XRX200_DMA_BURST_LEN 8
+#define XRX200_DMA_PACKET_COMPLETE 0
+#define XRX200_DMA_PACKET_IN_PROGRESS 1
+
/* cpu port mac */
#define PMAC_RX_IPG 0x0024
#define PMAC_RX_IPG_MASK 0xf
@@ -60,7 +63,14 @@ struct xrx200_chan {
struct napi_struct napi;
struct ltq_dma_channel dma;
- struct sk_buff *skb[LTQ_DESC_NUM];
+
+ union {
+ struct sk_buff *skb[LTQ_DESC_NUM];
+ void *rx_buff[LTQ_DESC_NUM];
+ };
+
+ struct sk_buff *skb_head;
+ struct sk_buff *skb_tail;
struct xrx200_priv *priv;
};
@@ -72,6 +82,7 @@ struct xrx200_priv {
struct xrx200_chan chan_rx;
u16 rx_buf_size;
+ u16 rx_skb_size;
struct net_device *net_dev;
struct device *dev;
@@ -109,6 +120,12 @@ static int xrx200_buffer_size(int mtu)
return round_up(xrx200_max_frame_len(mtu), 4 * XRX200_DMA_BURST_LEN);
}
+static int xrx200_skb_size(u16 buf_size)
+{
+ return SKB_DATA_ALIGN(buf_size + NET_SKB_PAD + NET_IP_ALIGN) +
+ SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
+}
+
/* drop all the packets from the DMA ring */
static void xrx200_flush_dma(struct xrx200_chan *ch)
{
@@ -167,30 +184,29 @@ static int xrx200_close(struct net_device *net_dev)
return 0;
}
-static int xrx200_alloc_skb(struct xrx200_chan *ch)
+static int xrx200_alloc_buf(struct xrx200_chan *ch, void *(*alloc)(unsigned int size))
{
- struct sk_buff *skb = ch->skb[ch->dma.desc];
+ void *buf = ch->rx_buff[ch->dma.desc];
struct xrx200_priv *priv = ch->priv;
dma_addr_t mapping;
int ret = 0;
- ch->skb[ch->dma.desc] = netdev_alloc_skb_ip_align(priv->net_dev,
- priv->rx_buf_size);
- if (!ch->skb[ch->dma.desc]) {
+ ch->rx_buff[ch->dma.desc] = alloc(priv->rx_skb_size);
+ if (!ch->rx_buff[ch->dma.desc]) {
ret = -ENOMEM;
goto skip;
}
- mapping = dma_map_single(priv->dev, ch->skb[ch->dma.desc]->data,
+ mapping = dma_map_single(priv->dev, ch->rx_buff[ch->dma.desc],
priv->rx_buf_size, DMA_FROM_DEVICE);
if (unlikely(dma_mapping_error(priv->dev, mapping))) {
- dev_kfree_skb_any(ch->skb[ch->dma.desc]);
- ch->skb[ch->dma.desc] = skb;
+ skb_free_frag(ch->rx_buff[ch->dma.desc]);
+ ch->rx_buff[ch->dma.desc] = buf;
ret = -ENOMEM;
goto skip;
}
- ch->dma.desc_base[ch->dma.desc].addr = mapping;
+ ch->dma.desc_base[ch->dma.desc].addr = mapping + NET_SKB_PAD + NET_IP_ALIGN;
/* Make sure the address is written before we give it to HW */
wmb();
skip:
@@ -204,12 +220,14 @@ static int xrx200_hw_receive(struct xrx200_chan *ch)
{
struct xrx200_priv *priv = ch->priv;
struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
- struct sk_buff *skb = ch->skb[ch->dma.desc];
- int len = (desc->ctl & LTQ_DMA_SIZE_MASK);
+ void *buf = ch->rx_buff[ch->dma.desc];
+ u32 ctl = desc->ctl;
+ int len = (ctl & LTQ_DMA_SIZE_MASK);
struct net_device *net_dev = priv->net_dev;
+ struct sk_buff *skb;
int ret;
- ret = xrx200_alloc_skb(ch);
+ ret = xrx200_alloc_buf(ch, napi_alloc_frag);
ch->dma.desc++;
ch->dma.desc %= LTQ_DESC_NUM;
@@ -220,13 +238,39 @@ static int xrx200_hw_receive(struct xrx200_chan *ch)
return ret;
}
+ skb = build_skb(buf, priv->rx_skb_size);
+ skb_reserve(skb, NET_SKB_PAD);
skb_put(skb, len);
- skb->protocol = eth_type_trans(skb, net_dev);
- netif_receive_skb(skb);
- net_dev->stats.rx_packets++;
- net_dev->stats.rx_bytes += len;
- return 0;
+ /* add buffers to skb via skb->frag_list */
+ if (ctl & LTQ_DMA_SOP) {
+ ch->skb_head = skb;
+ ch->skb_tail = skb;
+ skb_reserve(skb, NET_IP_ALIGN);
+ } else if (ch->skb_head) {
+ if (ch->skb_head == ch->skb_tail)
+ skb_shinfo(ch->skb_tail)->frag_list = skb;
+ else
+ ch->skb_tail->next = skb;
+ ch->skb_tail = skb;
+ ch->skb_head->len += skb->len;
+ ch->skb_head->data_len += skb->len;
+ ch->skb_head->truesize += skb->truesize;
+ }
+
+ if (ctl & LTQ_DMA_EOP) {
+ ch->skb_head->protocol = eth_type_trans(ch->skb_head, net_dev);
+ netif_receive_skb(ch->skb_head);
+ net_dev->stats.rx_packets++;
+ net_dev->stats.rx_bytes += ch->skb_head->len;
+ ch->skb_head = NULL;
+ ch->skb_tail = NULL;
+ ret = XRX200_DMA_PACKET_COMPLETE;
+ } else {
+ ret = XRX200_DMA_PACKET_IN_PROGRESS;
+ }
+
+ return ret;
}
static int xrx200_poll_rx(struct napi_struct *napi, int budget)
@@ -241,7 +285,9 @@ static int xrx200_poll_rx(struct napi_struct *napi, int budget)
if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) {
ret = xrx200_hw_receive(ch);
- if (ret)
+ if (ret == XRX200_DMA_PACKET_IN_PROGRESS)
+ continue;
+ if (ret != XRX200_DMA_PACKET_COMPLETE)
return ret;
rx++;
} else {
@@ -362,12 +408,13 @@ xrx200_change_mtu(struct net_device *net_dev, int new_mtu)
struct xrx200_chan *ch_rx = &priv->chan_rx;
int old_mtu = net_dev->mtu;
bool running = false;
- struct sk_buff *skb;
+ void *buff;
int curr_desc;
int ret = 0;
net_dev->mtu = new_mtu;
priv->rx_buf_size = xrx200_buffer_size(new_mtu);
+ priv->rx_skb_size = xrx200_skb_size(priv->rx_buf_size);
if (new_mtu <= old_mtu)
return ret;
@@ -383,14 +430,15 @@ xrx200_change_mtu(struct net_device *net_dev, int new_mtu)
for (ch_rx->dma.desc = 0; ch_rx->dma.desc < LTQ_DESC_NUM;
ch_rx->dma.desc++) {
- skb = ch_rx->skb[ch_rx->dma.desc];
- ret = xrx200_alloc_skb(ch_rx);
+ buff = ch_rx->rx_buff[ch_rx->dma.desc];
+ ret = xrx200_alloc_buf(ch_rx, netdev_alloc_frag);
if (ret) {
net_dev->mtu = old_mtu;
priv->rx_buf_size = xrx200_buffer_size(old_mtu);
+ priv->rx_skb_size = xrx200_skb_size(priv->rx_buf_size);
break;
}
- dev_kfree_skb_any(skb);
+ skb_free_frag(buff);
}
ch_rx->dma.desc = curr_desc;
@@ -443,7 +491,7 @@ static int xrx200_dma_init(struct xrx200_priv *priv)
ltq_dma_alloc_rx(&ch_rx->dma);
for (ch_rx->dma.desc = 0; ch_rx->dma.desc < LTQ_DESC_NUM;
ch_rx->dma.desc++) {
- ret = xrx200_alloc_skb(ch_rx);
+ ret = xrx200_alloc_buf(ch_rx, netdev_alloc_frag);
if (ret)
goto rx_free;
}
@@ -478,7 +526,7 @@ rx_ring_free:
/* free the allocated RX ring */
for (i = 0; i < LTQ_DESC_NUM; i++) {
if (priv->chan_rx.skb[i])
- dev_kfree_skb_any(priv->chan_rx.skb[i]);
+ skb_free_frag(priv->chan_rx.rx_buff[i]);
}
rx_free:
@@ -495,7 +543,7 @@ static void xrx200_hw_cleanup(struct xrx200_priv *priv)
/* free the allocated RX ring */
for (i = 0; i < LTQ_DESC_NUM; i++)
- dev_kfree_skb_any(priv->chan_rx.skb[i]);
+ skb_free_frag(priv->chan_rx.rx_buff[i]);
}
static int xrx200_probe(struct platform_device *pdev)
@@ -520,6 +568,7 @@ static int xrx200_probe(struct platform_device *pdev)
net_dev->min_mtu = ETH_ZLEN;
net_dev->max_mtu = XRX200_DMA_DATA_LEN - xrx200_max_frame_len(0);
priv->rx_buf_size = xrx200_buffer_size(ETH_DATA_LEN);
+ priv->rx_skb_size = xrx200_skb_size(priv->rx_buf_size);
/* load the memory ranges */
priv->pmac_reg = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
@@ -564,8 +613,10 @@ static int xrx200_probe(struct platform_device *pdev)
PMAC_HD_CTL);
/* setup NAPI */
- netif_napi_add(net_dev, &priv->chan_rx.napi, xrx200_poll_rx, 32);
- netif_tx_napi_add(net_dev, &priv->chan_tx.napi, xrx200_tx_housekeeping, 32);
+ netif_napi_add(net_dev, &priv->chan_rx.napi, xrx200_poll_rx,
+ NAPI_POLL_WEIGHT);
+ netif_tx_napi_add(net_dev, &priv->chan_tx.napi, xrx200_tx_housekeeping,
+ NAPI_POLL_WEIGHT);
platform_set_drvdata(pdev, priv);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.