diff options
author | Aleksander Jan Bajkowski <olek2@wp.pl> | 2021-09-19 21:24:28 +0300 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2021-09-20 12:07:52 +0300 |
commit | 998ac358019e491217e752bc6dcbb3afb2a6fa3e (patch) | |
tree | 0a0c57c35563fd536e121d6dd2890f094add0064 | |
parent | 13f356f5dc9de17181fa255a379fde29eea060d4 (diff) | |
download | linux-998ac358019e491217e752bc6dcbb3afb2a6fa3e.tar.xz |
net: lantiq: add support for jumbo frames
Add support for jumbo frames. Full support for jumbo frames requires
changes in the DSA switch driver (lantiq_gswip.c).
Tested on BT Hone Hub 5A.
Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r-- | drivers/net/ethernet/lantiq_xrx200.c | 64 |
1 files changed, 57 insertions, 7 deletions
diff --git a/drivers/net/ethernet/lantiq_xrx200.c b/drivers/net/ethernet/lantiq_xrx200.c index 5d96248ce83b..9b7307eba97c 100644 --- a/drivers/net/ethernet/lantiq_xrx200.c +++ b/drivers/net/ethernet/lantiq_xrx200.c @@ -14,13 +14,15 @@ #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 @@ -109,7 +111,8 @@ 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->net_dev->mtu + VLAN_ETH_HLEN + + ETH_FCS_LEN); ch->dma.desc++; ch->dma.desc %= LTQ_DESC_NUM; } @@ -157,19 +160,20 @@ static int xrx200_close(struct net_device *net_dev) static int xrx200_alloc_skb(struct xrx200_chan *ch) { + int len = ch->priv->net_dev->mtu + VLAN_ETH_HLEN + ETH_FCS_LEN; struct sk_buff *skb = ch->skb[ch->dma.desc]; 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); + len); 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); + 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; @@ -182,8 +186,7 @@ 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) | len; return ret; } @@ -343,10 +346,57 @@ 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; + + 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; + 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, }; @@ -456,7 +506,7 @@ 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 - VLAN_ETH_HLEN - ETH_FCS_LEN; /* load the memory ranges */ priv->pmac_reg = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); |