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https://github.com/torvalds/linux.git
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net: dsa: reduce number of protocol hooks
DSA is currently registering one packet_type function per EtherType it needs to intercept in the receive path of a DSA-enabled Ethernet device. Right now we have three of them: trailer, DSA and eDSA, and there might be more in the future, this will not scale to the addition of new protocols. This patch proceeds with adding a new layer of abstraction and two new functions: dsa_switch_rcv() which will dispatch into the tag-protocol specific receive function implemented by net/dsa/tag_*.c dsa_slave_xmit() which will dispatch into the tag-protocol specific transmit function implemented by net/dsa/tag_*.c When we do create the per-port slave network devices, we iterate over the switch protocol to assign the DSA-specific receive and transmit operations. A new fake ethertype value is used: ETH_P_XDSA to illustrate the fact that this is no longer going to look like ETH_P_DSA or ETH_P_TRAILER like it used to be. This allows us to greatly simplify the check in eth_type_trans() and always override the skb->protocol with ETH_P_XDSA for Ethernet switches tagged protocol, while also reducing the number repetitive slave netdevice_ops assignments. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli
David S. Miller
parent
8663dc2002
commit
3e8a72d1da
10 changed files with 68 additions and 105 deletions
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@ -1781,24 +1781,13 @@ void dev_net_set(struct net_device *dev, struct net *net)
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#endif
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}
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static inline bool netdev_uses_dsa_tags(struct net_device *dev)
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static inline bool netdev_uses_dsa(struct net_device *dev)
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{
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#ifdef CONFIG_NET_DSA_TAG_DSA
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if (dev->dsa_ptr != NULL)
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return dsa_uses_dsa_tags(dev->dsa_ptr);
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#ifdef CONFIG_NET_DSA
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return dev->dsa_ptr != NULL;
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#else
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return false;
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#endif
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return 0;
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}
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static inline bool netdev_uses_trailer_tags(struct net_device *dev)
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{
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#ifdef CONFIG_NET_DSA_TAG_TRAILER
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if (dev->dsa_ptr != NULL)
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return dsa_uses_trailer_tags(dev->dsa_ptr);
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#endif
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return 0;
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}
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/**
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@ -1933,6 +1922,13 @@ struct udp_offload {
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struct offload_callbacks callbacks;
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};
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struct dsa_device_ops {
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netdev_tx_t (*xmit)(struct sk_buff *skb, struct net_device *dev);
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int (*rcv)(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt, struct net_device *orig_dev);
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};
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/* often modified stats are per cpu, other are shared (netdev->stats) */
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struct pcpu_sw_netstats {
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u64 rx_packets;
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@ -59,6 +59,8 @@ struct dsa_platform_data {
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struct dsa_chip_data *chip;
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};
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struct dsa_device_ops;
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struct dsa_switch_tree {
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/*
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* Configuration data for the platform device that owns
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@ -71,6 +73,7 @@ struct dsa_switch_tree {
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* protocol to use.
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*/
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struct net_device *master_netdev;
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const struct dsa_device_ops *ops;
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__be16 tag_protocol;
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/*
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@ -186,21 +189,4 @@ static inline void *ds_to_priv(struct dsa_switch *ds)
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return (void *)(ds + 1);
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}
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/*
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* The original DSA tag format and some other tag formats have no
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* ethertype, which means that we need to add a little hack to the
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* networking receive path to make sure that received frames get
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* the right ->protocol assigned to them when one of those tag
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* formats is in use.
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*/
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static inline bool dsa_uses_dsa_tags(struct dsa_switch_tree *dst)
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{
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return !!(dst->tag_protocol == htons(ETH_P_DSA));
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}
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static inline bool dsa_uses_trailer_tags(struct dsa_switch_tree *dst)
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{
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return !!(dst->tag_protocol == htons(ETH_P_TRAILER));
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}
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#endif
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@ -128,6 +128,7 @@
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#define ETH_P_PHONET 0x00F5 /* Nokia Phonet frames */
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#define ETH_P_IEEE802154 0x00F6 /* IEEE802.15.4 frame */
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#define ETH_P_CAIF 0x00F7 /* ST-Ericsson CAIF protocol */
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#define ETH_P_XDSA 0x00F8 /* Multiplexed DSA protocol */
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/*
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* This is an Ethernet frame header.
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@ -608,6 +608,24 @@ static void dsa_shutdown(struct platform_device *pdev)
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{
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}
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static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt, struct net_device *orig_dev)
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{
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struct dsa_switch_tree *dst = dev->dsa_ptr;
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if (unlikely(dst == NULL)) {
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kfree_skb(skb);
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return 0;
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}
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return dst->ops->rcv(skb, dev, pt, orig_dev);
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}
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struct packet_type dsa_pack_type __read_mostly = {
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.type = cpu_to_be16(ETH_P_XDSA),
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.func = dsa_switch_rcv,
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};
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static const struct of_device_id dsa_of_match_table[] = {
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{ .compatible = "marvell,dsa", },
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{}
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@ -633,30 +651,15 @@ static int __init dsa_init_module(void)
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if (rc)
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return rc;
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#ifdef CONFIG_NET_DSA_TAG_DSA
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dev_add_pack(&dsa_packet_type);
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#endif
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#ifdef CONFIG_NET_DSA_TAG_EDSA
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dev_add_pack(&edsa_packet_type);
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#endif
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#ifdef CONFIG_NET_DSA_TAG_TRAILER
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dev_add_pack(&trailer_packet_type);
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#endif
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dev_add_pack(&dsa_pack_type);
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return 0;
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}
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module_init(dsa_init_module);
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static void __exit dsa_cleanup_module(void)
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{
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#ifdef CONFIG_NET_DSA_TAG_TRAILER
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dev_remove_pack(&trailer_packet_type);
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#endif
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#ifdef CONFIG_NET_DSA_TAG_EDSA
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dev_remove_pack(&edsa_packet_type);
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#endif
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#ifdef CONFIG_NET_DSA_TAG_DSA
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dev_remove_pack(&dsa_packet_type);
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#endif
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dev_remove_pack(&dsa_pack_type);
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platform_driver_unregister(&dsa_driver);
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}
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module_exit(dsa_cleanup_module);
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@ -45,16 +45,13 @@ struct net_device *dsa_slave_create(struct dsa_switch *ds,
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int port, char *name);
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/* tag_dsa.c */
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netdev_tx_t dsa_xmit(struct sk_buff *skb, struct net_device *dev);
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extern struct packet_type dsa_packet_type;
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extern const struct dsa_device_ops dsa_netdev_ops;
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/* tag_edsa.c */
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netdev_tx_t edsa_xmit(struct sk_buff *skb, struct net_device *dev);
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extern struct packet_type edsa_packet_type;
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extern const struct dsa_device_ops edsa_netdev_ops;
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/* tag_trailer.c */
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netdev_tx_t trailer_xmit(struct sk_buff *skb, struct net_device *dev);
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extern struct packet_type trailer_packet_type;
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extern const struct dsa_device_ops trailer_netdev_ops;
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#endif
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@ -171,6 +171,14 @@ static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
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return -EOPNOTSUPP;
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}
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static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct dsa_slave_priv *p = netdev_priv(dev);
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struct dsa_switch_tree *dst = p->parent->dst;
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return dst->ops->xmit(skb, dev);
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}
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/* ethtool operations *******************************************************/
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static int
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@ -293,42 +301,16 @@ static const struct ethtool_ops dsa_slave_ethtool_ops = {
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.get_sset_count = dsa_slave_get_sset_count,
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};
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#ifdef CONFIG_NET_DSA_TAG_DSA
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static const struct net_device_ops dsa_netdev_ops = {
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static const struct net_device_ops dsa_slave_netdev_ops = {
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.ndo_init = dsa_slave_init,
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.ndo_open = dsa_slave_open,
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.ndo_stop = dsa_slave_close,
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.ndo_start_xmit = dsa_xmit,
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.ndo_start_xmit = dsa_slave_xmit,
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.ndo_change_rx_flags = dsa_slave_change_rx_flags,
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.ndo_set_rx_mode = dsa_slave_set_rx_mode,
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.ndo_set_mac_address = dsa_slave_set_mac_address,
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.ndo_do_ioctl = dsa_slave_ioctl,
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};
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#endif
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#ifdef CONFIG_NET_DSA_TAG_EDSA
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static const struct net_device_ops edsa_netdev_ops = {
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.ndo_init = dsa_slave_init,
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.ndo_open = dsa_slave_open,
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.ndo_stop = dsa_slave_close,
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.ndo_start_xmit = edsa_xmit,
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.ndo_change_rx_flags = dsa_slave_change_rx_flags,
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.ndo_set_rx_mode = dsa_slave_set_rx_mode,
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.ndo_set_mac_address = dsa_slave_set_mac_address,
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.ndo_do_ioctl = dsa_slave_ioctl,
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};
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#endif
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#ifdef CONFIG_NET_DSA_TAG_TRAILER
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static const struct net_device_ops trailer_netdev_ops = {
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.ndo_init = dsa_slave_init,
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.ndo_open = dsa_slave_open,
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.ndo_stop = dsa_slave_close,
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.ndo_start_xmit = trailer_xmit,
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.ndo_change_rx_flags = dsa_slave_change_rx_flags,
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.ndo_set_rx_mode = dsa_slave_set_rx_mode,
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.ndo_set_mac_address = dsa_slave_set_mac_address,
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.ndo_do_ioctl = dsa_slave_ioctl,
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};
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#endif
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/* slave device setup *******************************************************/
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struct net_device *
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@ -349,21 +331,22 @@ dsa_slave_create(struct dsa_switch *ds, struct device *parent,
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slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
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eth_hw_addr_inherit(slave_dev, master);
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slave_dev->tx_queue_len = 0;
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slave_dev->netdev_ops = &dsa_slave_netdev_ops;
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switch (ds->dst->tag_protocol) {
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#ifdef CONFIG_NET_DSA_TAG_DSA
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case htons(ETH_P_DSA):
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slave_dev->netdev_ops = &dsa_netdev_ops;
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ds->dst->ops = &dsa_netdev_ops;
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break;
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#endif
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#ifdef CONFIG_NET_DSA_TAG_EDSA
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case htons(ETH_P_EDSA):
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slave_dev->netdev_ops = &edsa_netdev_ops;
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ds->dst->ops = &edsa_netdev_ops;
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break;
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#endif
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#ifdef CONFIG_NET_DSA_TAG_TRAILER
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case htons(ETH_P_TRAILER):
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slave_dev->netdev_ops = &trailer_netdev_ops;
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ds->dst->ops = &trailer_netdev_ops;
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break;
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#endif
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default:
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@ -16,7 +16,7 @@
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#define DSA_HLEN 4
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netdev_tx_t dsa_xmit(struct sk_buff *skb, struct net_device *dev)
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static netdev_tx_t dsa_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct dsa_slave_priv *p = netdev_priv(dev);
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u8 *dsa_header;
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@ -186,7 +186,7 @@ static int dsa_rcv(struct sk_buff *skb, struct net_device *dev,
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return 0;
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}
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struct packet_type dsa_packet_type __read_mostly = {
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.type = cpu_to_be16(ETH_P_DSA),
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.func = dsa_rcv,
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const struct dsa_device_ops dsa_netdev_ops = {
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.xmit = dsa_xmit,
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.rcv = dsa_rcv,
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};
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@ -17,7 +17,7 @@
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#define DSA_HLEN 4
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#define EDSA_HLEN 8
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netdev_tx_t edsa_xmit(struct sk_buff *skb, struct net_device *dev)
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static netdev_tx_t edsa_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct dsa_slave_priv *p = netdev_priv(dev);
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u8 *edsa_header;
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@ -205,7 +205,7 @@ static int edsa_rcv(struct sk_buff *skb, struct net_device *dev,
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return 0;
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}
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struct packet_type edsa_packet_type __read_mostly = {
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.type = cpu_to_be16(ETH_P_EDSA),
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.func = edsa_rcv,
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const struct dsa_device_ops edsa_netdev_ops = {
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.xmit = edsa_xmit,
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.rcv = edsa_rcv,
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};
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@ -14,7 +14,7 @@
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#include <linux/slab.h>
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#include "dsa_priv.h"
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netdev_tx_t trailer_xmit(struct sk_buff *skb, struct net_device *dev)
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static netdev_tx_t trailer_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct dsa_slave_priv *p = netdev_priv(dev);
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struct sk_buff *nskb;
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@ -114,7 +114,7 @@ static int trailer_rcv(struct sk_buff *skb, struct net_device *dev,
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return 0;
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}
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struct packet_type trailer_packet_type __read_mostly = {
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.type = cpu_to_be16(ETH_P_TRAILER),
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.func = trailer_rcv,
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const struct dsa_device_ops trailer_netdev_ops = {
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.xmit = trailer_xmit,
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.rcv = trailer_rcv,
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};
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@ -181,11 +181,8 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
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* variants has been configured on the receiving interface,
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* and if so, set skb->protocol without looking at the packet.
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*/
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if (unlikely(netdev_uses_dsa_tags(dev)))
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return htons(ETH_P_DSA);
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if (unlikely(netdev_uses_trailer_tags(dev)))
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return htons(ETH_P_TRAILER);
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if (unlikely(netdev_uses_dsa(dev)))
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return htons(ETH_P_XDSA);
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if (likely(ntohs(eth->h_proto) >= ETH_P_802_3_MIN))
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return eth->h_proto;
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