diff options
Diffstat (limited to 'drivers/net/ethernet/lantiq_xrx200.c')
| -rw-r--r-- | drivers/net/ethernet/lantiq_xrx200.c | 143 |
1 files changed, 107 insertions, 36 deletions
diff --git a/drivers/net/ethernet/lantiq_xrx200.c b/drivers/net/ethernet/lantiq_xrx200.c index 0da09ea81980..8d646c7f8c82 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; }; @@ -71,6 +81,9 @@ struct xrx200_priv { struct xrx200_chan chan_tx; struct xrx200_chan chan_rx; + u16 rx_buf_size; + u16 rx_skb_size; + struct net_device *net_dev; struct device *dev; @@ -97,6 +110,22 @@ 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); +} + +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) { @@ -109,8 +138,7 @@ static void xrx200_flush_dma(struct xrx200_chan *ch) break; desc->ctl = LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(NET_IP_ALIGN) | - (ch->priv->net_dev->mtu + VLAN_ETH_HLEN + - ETH_FCS_LEN); + ch->priv->rx_buf_size; ch->dma.desc++; ch->dma.desc %= LTQ_DESC_NUM; } @@ -156,35 +184,35 @@ 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)) { - int len = ch->priv->net_dev->mtu + VLAN_ETH_HLEN + ETH_FCS_LEN; - 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(ch->priv->net_dev, - len); - if (!ch->skb[ch->dma.desc]) { + ch->rx_buff[ch->dma.desc] = alloc(priv->rx_skb_size); + if (!ch->rx_buff[ch->dma.desc]) { + ch->rx_buff[ch->dma.desc] = buf; ret = -ENOMEM; goto skip; } - mapping = dma_map_single(ch->priv->dev, ch->skb[ch->dma.desc]->data, - len, DMA_FROM_DEVICE); - if (unlikely(dma_mapping_error(ch->priv->dev, mapping))) { - dev_kfree_skb_any(ch->skb[ch->dma.desc]); - ch->skb[ch->dma.desc] = skb; + 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))) { + 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: ch->dma.desc_base[ch->dma.desc].ctl = - LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(NET_IP_ALIGN) | len; + LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(NET_IP_ALIGN) | priv->rx_buf_size; return ret; } @@ -193,12 +221,14 @@ 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; @@ -209,13 +239,45 @@ static int xrx200_hw_receive(struct xrx200_chan *ch) return ret; } + skb = build_skb(buf, priv->rx_skb_size); + if (!skb) { + skb_free_frag(buf); + net_dev->stats.rx_dropped++; + return -ENOMEM; + } + + 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 - ETH_FCS_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); + net_dev->stats.rx_packets++; + net_dev->stats.rx_bytes += ch->skb_head->len; + netif_receive_skb(ch->skb_head); + 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) @@ -230,8 +292,10 @@ 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) - return ret; + if (ret == XRX200_DMA_PACKET_IN_PROGRESS) + continue; + if (ret != XRX200_DMA_PACKET_COMPLETE) + break; rx++; } else { break; @@ -351,11 +415,13 @@ 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; @@ -371,13 +437,15 @@ 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; @@ -430,7 +498,7 @@ 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; } @@ -465,7 +533,7 @@ 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: @@ -482,7 +550,7 @@ 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) @@ -505,7 +573,9 @@ 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 - VLAN_ETH_HLEN - ETH_FCS_LEN; + 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); @@ -550,8 +620,9 @@ 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); + netif_napi_add_tx(net_dev, &priv->chan_tx.napi, + xrx200_tx_housekeeping); platform_set_drvdata(pdev, priv); |