diff options
Diffstat (limited to 'drivers/net/ethernet/lantiq_xrx200.c')
| -rw-r--r-- | drivers/net/ethernet/lantiq_xrx200.c | 96 |
1 files changed, 81 insertions, 15 deletions
diff --git a/drivers/net/ethernet/lantiq_xrx200.c b/drivers/net/ethernet/lantiq_xrx200.c index fb78f17d734f..80bfaf2fec92 100644 --- a/drivers/net/ethernet/lantiq_xrx200.c +++ b/drivers/net/ethernet/lantiq_xrx200.c @@ -14,15 +14,18 @@ #include <linux/clk.h> #include <linux/delay.h> +#include <linux/if_vlan.h> + #include <linux/of_net.h> #include <linux/of_platform.h> #include <xway_dma.h> /* DMA */ -#define XRX200_DMA_DATA_LEN 0x600 +#define XRX200_DMA_DATA_LEN (SZ_64K - 1) #define XRX200_DMA_RX 0 #define XRX200_DMA_TX 1 +#define XRX200_DMA_BURST_LEN 8 /* cpu port mac */ #define PMAC_RX_IPG 0x0024 @@ -68,6 +71,8 @@ struct xrx200_priv { struct xrx200_chan chan_tx; struct xrx200_chan chan_rx; + u16 rx_buf_size; + struct net_device *net_dev; struct device *dev; @@ -94,6 +99,16 @@ static void xrx200_pmac_mask(struct xrx200_priv *priv, u32 clear, u32 set, xrx200_pmac_w32(priv, val, offset); } +static int xrx200_max_frame_len(int mtu) +{ + return VLAN_ETH_HLEN + mtu; +} + +static int xrx200_buffer_size(int mtu) +{ + return round_up(xrx200_max_frame_len(mtu), 4 * XRX200_DMA_BURST_LEN); +} + /* drop all the packets from the DMA ring */ static void xrx200_flush_dma(struct xrx200_chan *ch) { @@ -106,7 +121,7 @@ static void xrx200_flush_dma(struct xrx200_chan *ch) break; desc->ctl = LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(NET_IP_ALIGN) | - XRX200_DMA_DATA_LEN; + ch->priv->rx_buf_size; ch->dma.desc++; ch->dma.desc %= LTQ_DESC_NUM; } @@ -155,19 +170,20 @@ static int xrx200_close(struct net_device *net_dev) static int xrx200_alloc_skb(struct xrx200_chan *ch) { struct sk_buff *skb = ch->skb[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(ch->priv->net_dev, - XRX200_DMA_DATA_LEN); + ch->skb[ch->dma.desc] = netdev_alloc_skb_ip_align(priv->net_dev, + priv->rx_buf_size); if (!ch->skb[ch->dma.desc]) { ret = -ENOMEM; goto skip; } - mapping = dma_map_single(ch->priv->dev, ch->skb[ch->dma.desc]->data, - XRX200_DMA_DATA_LEN, DMA_FROM_DEVICE); - if (unlikely(dma_mapping_error(ch->priv->dev, mapping))) { + mapping = dma_map_single(priv->dev, ch->skb[ch->dma.desc]->data, + 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; ret = -ENOMEM; @@ -179,8 +195,7 @@ static int xrx200_alloc_skb(struct xrx200_chan *ch) wmb(); skip: ch->dma.desc_base[ch->dma.desc].ctl = - LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(NET_IP_ALIGN) | - XRX200_DMA_DATA_LEN; + LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(NET_IP_ALIGN) | priv->rx_buf_size; return ret; } @@ -209,7 +224,7 @@ static int xrx200_hw_receive(struct xrx200_chan *ch) skb->protocol = eth_type_trans(skb, net_dev); netif_receive_skb(skb); net_dev->stats.rx_packets++; - net_dev->stats.rx_bytes += len - ETH_FCS_LEN; + net_dev->stats.rx_bytes += len; return 0; } @@ -316,8 +331,8 @@ static netdev_tx_t xrx200_start_xmit(struct sk_buff *skb, if (unlikely(dma_mapping_error(priv->dev, mapping))) goto err_drop; - /* dma needs to start on a 16 byte aligned address */ - byte_offset = mapping % 16; + /* dma needs to start on a burst length value aligned address */ + byte_offset = mapping % (XRX200_DMA_BURST_LEN * 4); desc->addr = mapping - byte_offset; /* Make sure the address is written before we give it to HW */ @@ -340,10 +355,59 @@ err_drop: return NETDEV_TX_OK; } +static int +xrx200_change_mtu(struct net_device *net_dev, int new_mtu) +{ + struct xrx200_priv *priv = netdev_priv(net_dev); + struct xrx200_chan *ch_rx = &priv->chan_rx; + int old_mtu = net_dev->mtu; + bool running = false; + struct sk_buff *skb; + int curr_desc; + int ret = 0; + + net_dev->mtu = new_mtu; + priv->rx_buf_size = xrx200_buffer_size(new_mtu); + + if (new_mtu <= old_mtu) + return ret; + + running = netif_running(net_dev); + if (running) { + napi_disable(&ch_rx->napi); + ltq_dma_close(&ch_rx->dma); + } + + xrx200_poll_rx(&ch_rx->napi, LTQ_DESC_NUM); + curr_desc = ch_rx->dma.desc; + + 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); + if (ret) { + net_dev->mtu = old_mtu; + priv->rx_buf_size = xrx200_buffer_size(old_mtu); + break; + } + dev_kfree_skb_any(skb); + } + + ch_rx->dma.desc = curr_desc; + if (running) { + napi_enable(&ch_rx->napi); + ltq_dma_open(&ch_rx->dma); + ltq_dma_enable_irq(&ch_rx->dma); + } + + return ret; +} + static const struct net_device_ops xrx200_netdev_ops = { .ndo_open = xrx200_open, .ndo_stop = xrx200_close, .ndo_start_xmit = xrx200_start_xmit, + .ndo_change_mtu = xrx200_change_mtu, .ndo_set_mac_address = eth_mac_addr, .ndo_validate_addr = eth_validate_addr, }; @@ -369,7 +433,8 @@ static int xrx200_dma_init(struct xrx200_priv *priv) int ret = 0; int i; - ltq_dma_init_port(DMA_PORT_ETOP); + ltq_dma_init_port(DMA_PORT_ETOP, XRX200_DMA_BURST_LEN, + XRX200_DMA_BURST_LEN); ch_rx->dma.nr = XRX200_DMA_RX; ch_rx->dma.dev = priv->dev; @@ -453,7 +518,8 @@ static int xrx200_probe(struct platform_device *pdev) net_dev->netdev_ops = &xrx200_netdev_ops; SET_NETDEV_DEV(net_dev, dev); net_dev->min_mtu = ETH_ZLEN; - net_dev->max_mtu = XRX200_DMA_DATA_LEN; + net_dev->max_mtu = XRX200_DMA_DATA_LEN - xrx200_max_frame_len(0); + priv->rx_buf_size = xrx200_buffer_size(ETH_DATA_LEN); /* load the memory ranges */ priv->pmac_reg = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); @@ -474,7 +540,7 @@ static int xrx200_probe(struct platform_device *pdev) return PTR_ERR(priv->clk); } - err = of_get_mac_address(np, net_dev->dev_addr); + err = of_get_ethdev_address(np, net_dev); if (err) eth_hw_addr_random(net_dev); |