mirror of https://gitee.com/openkylin/linux.git
370 lines
8.2 KiB
C
370 lines
8.2 KiB
C
/*
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* net/dsa/dsa.c - Hardware switch handling
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* Copyright (c) 2008-2009 Marvell Semiconductor
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* Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/of.h>
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#include <linux/of_mdio.h>
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#include <linux/of_platform.h>
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#include <linux/of_net.h>
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#include <linux/netdevice.h>
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#include <linux/sysfs.h>
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#include <linux/phy_fixed.h>
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#include <linux/ptp_classify.h>
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#include <linux/etherdevice.h>
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#include "dsa_priv.h"
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static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
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struct net_device *dev)
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{
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/* Just return the original SKB */
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return skb;
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}
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static const struct dsa_device_ops none_ops = {
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.xmit = dsa_slave_notag_xmit,
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.rcv = NULL,
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};
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const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
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#ifdef CONFIG_NET_DSA_TAG_BRCM
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[DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
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#endif
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#ifdef CONFIG_NET_DSA_TAG_BRCM_PREPEND
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[DSA_TAG_PROTO_BRCM_PREPEND] = &brcm_prepend_netdev_ops,
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#endif
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#ifdef CONFIG_NET_DSA_TAG_DSA
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[DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
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#endif
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#ifdef CONFIG_NET_DSA_TAG_EDSA
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[DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
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#endif
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#ifdef CONFIG_NET_DSA_TAG_GSWIP
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[DSA_TAG_PROTO_GSWIP] = &gswip_netdev_ops,
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#endif
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#ifdef CONFIG_NET_DSA_TAG_KSZ
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[DSA_TAG_PROTO_KSZ] = &ksz_netdev_ops,
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#endif
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#ifdef CONFIG_NET_DSA_TAG_LAN9303
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[DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
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#endif
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#ifdef CONFIG_NET_DSA_TAG_MTK
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[DSA_TAG_PROTO_MTK] = &mtk_netdev_ops,
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#endif
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#ifdef CONFIG_NET_DSA_TAG_QCA
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[DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
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#endif
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#ifdef CONFIG_NET_DSA_TAG_TRAILER
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[DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
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#endif
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[DSA_TAG_PROTO_NONE] = &none_ops,
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};
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const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops)
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{
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const char *protocol_name[DSA_TAG_LAST] = {
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#ifdef CONFIG_NET_DSA_TAG_BRCM
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[DSA_TAG_PROTO_BRCM] = "brcm",
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#endif
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#ifdef CONFIG_NET_DSA_TAG_BRCM_PREPEND
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[DSA_TAG_PROTO_BRCM_PREPEND] = "brcm-prepend",
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#endif
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#ifdef CONFIG_NET_DSA_TAG_DSA
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[DSA_TAG_PROTO_DSA] = "dsa",
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#endif
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#ifdef CONFIG_NET_DSA_TAG_EDSA
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[DSA_TAG_PROTO_EDSA] = "edsa",
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#endif
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#ifdef CONFIG_NET_DSA_TAG_GSWIP
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[DSA_TAG_PROTO_GSWIP] = "gswip",
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#endif
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#ifdef CONFIG_NET_DSA_TAG_KSZ
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[DSA_TAG_PROTO_KSZ] = "ksz",
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#endif
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#ifdef CONFIG_NET_DSA_TAG_LAN9303
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[DSA_TAG_PROTO_LAN9303] = "lan9303",
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#endif
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#ifdef CONFIG_NET_DSA_TAG_MTK
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[DSA_TAG_PROTO_MTK] = "mtk",
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#endif
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#ifdef CONFIG_NET_DSA_TAG_QCA
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[DSA_TAG_PROTO_QCA] = "qca",
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#endif
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#ifdef CONFIG_NET_DSA_TAG_TRAILER
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[DSA_TAG_PROTO_TRAILER] = "trailer",
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#endif
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[DSA_TAG_PROTO_NONE] = "none",
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};
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unsigned int i;
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BUILD_BUG_ON(ARRAY_SIZE(protocol_name) != DSA_TAG_LAST);
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for (i = 0; i < ARRAY_SIZE(dsa_device_ops); i++)
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if (ops == dsa_device_ops[i])
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return protocol_name[i];
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return protocol_name[DSA_TAG_PROTO_NONE];
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};
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const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
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{
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const struct dsa_device_ops *ops;
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if (tag_protocol >= DSA_TAG_LAST)
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return ERR_PTR(-EINVAL);
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ops = dsa_device_ops[tag_protocol];
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if (!ops)
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return ERR_PTR(-ENOPROTOOPT);
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return ops;
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}
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static int dev_is_class(struct device *dev, void *class)
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{
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if (dev->class != NULL && !strcmp(dev->class->name, class))
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return 1;
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return 0;
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}
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static struct device *dev_find_class(struct device *parent, char *class)
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{
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if (dev_is_class(parent, class)) {
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get_device(parent);
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return parent;
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}
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return device_find_child(parent, class, dev_is_class);
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}
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struct net_device *dsa_dev_to_net_device(struct device *dev)
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{
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struct device *d;
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d = dev_find_class(dev, "net");
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if (d != NULL) {
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struct net_device *nd;
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nd = to_net_dev(d);
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dev_hold(nd);
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put_device(d);
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return nd;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);
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/* Determine if we should defer delivery of skb until we have a rx timestamp.
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*
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* Called from dsa_switch_rcv. For now, this will only work if tagging is
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* enabled on the switch. Normally the MAC driver would retrieve the hardware
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* timestamp when it reads the packet out of the hardware. However in a DSA
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* switch, the DSA driver owning the interface to which the packet is
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* delivered is never notified unless we do so here.
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*/
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static bool dsa_skb_defer_rx_timestamp(struct dsa_slave_priv *p,
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struct sk_buff *skb)
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{
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struct dsa_switch *ds = p->dp->ds;
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unsigned int type;
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if (skb_headroom(skb) < ETH_HLEN)
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return false;
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__skb_push(skb, ETH_HLEN);
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type = ptp_classify_raw(skb);
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__skb_pull(skb, ETH_HLEN);
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if (type == PTP_CLASS_NONE)
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return false;
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if (likely(ds->ops->port_rxtstamp))
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return ds->ops->port_rxtstamp(ds, p->dp->index, skb, type);
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return false;
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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 *unused)
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{
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struct dsa_port *cpu_dp = dev->dsa_ptr;
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struct sk_buff *nskb = NULL;
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struct pcpu_sw_netstats *s;
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struct dsa_slave_priv *p;
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if (unlikely(!cpu_dp)) {
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kfree_skb(skb);
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return 0;
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}
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skb = skb_unshare(skb, GFP_ATOMIC);
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if (!skb)
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return 0;
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nskb = cpu_dp->rcv(skb, dev, pt);
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if (!nskb) {
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kfree_skb(skb);
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return 0;
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}
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skb = nskb;
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p = netdev_priv(skb->dev);
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skb_push(skb, ETH_HLEN);
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skb->pkt_type = PACKET_HOST;
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skb->protocol = eth_type_trans(skb, skb->dev);
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s = this_cpu_ptr(p->stats64);
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u64_stats_update_begin(&s->syncp);
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s->rx_packets++;
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s->rx_bytes += skb->len;
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u64_stats_update_end(&s->syncp);
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if (dsa_skb_defer_rx_timestamp(p, skb))
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return 0;
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netif_receive_skb(skb);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
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{
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return dsa_is_user_port(ds, p) && ds->ports[p].slave;
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}
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int dsa_switch_suspend(struct dsa_switch *ds)
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{
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int i, ret = 0;
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/* Suspend slave network devices */
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for (i = 0; i < ds->num_ports; i++) {
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if (!dsa_is_port_initialized(ds, i))
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continue;
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ret = dsa_slave_suspend(ds->ports[i].slave);
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if (ret)
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return ret;
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}
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if (ds->ops->suspend)
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ret = ds->ops->suspend(ds);
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return ret;
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}
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EXPORT_SYMBOL_GPL(dsa_switch_suspend);
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int dsa_switch_resume(struct dsa_switch *ds)
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{
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int i, ret = 0;
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if (ds->ops->resume)
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ret = ds->ops->resume(ds);
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if (ret)
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return ret;
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/* Resume slave network devices */
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for (i = 0; i < ds->num_ports; i++) {
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if (!dsa_is_port_initialized(ds, i))
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continue;
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ret = dsa_slave_resume(ds->ports[i].slave);
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if (ret)
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(dsa_switch_resume);
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#endif
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static 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 struct workqueue_struct *dsa_owq;
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bool dsa_schedule_work(struct work_struct *work)
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{
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return queue_work(dsa_owq, work);
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}
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static ATOMIC_NOTIFIER_HEAD(dsa_notif_chain);
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int register_dsa_notifier(struct notifier_block *nb)
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{
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return atomic_notifier_chain_register(&dsa_notif_chain, nb);
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}
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EXPORT_SYMBOL_GPL(register_dsa_notifier);
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int unregister_dsa_notifier(struct notifier_block *nb)
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{
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return atomic_notifier_chain_unregister(&dsa_notif_chain, nb);
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}
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EXPORT_SYMBOL_GPL(unregister_dsa_notifier);
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int call_dsa_notifiers(unsigned long val, struct net_device *dev,
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struct dsa_notifier_info *info)
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{
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info->dev = dev;
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return atomic_notifier_call_chain(&dsa_notif_chain, val, info);
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}
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EXPORT_SYMBOL_GPL(call_dsa_notifiers);
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static int __init dsa_init_module(void)
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{
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int rc;
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dsa_owq = alloc_ordered_workqueue("dsa_ordered",
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WQ_MEM_RECLAIM);
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if (!dsa_owq)
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return -ENOMEM;
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rc = dsa_slave_register_notifier();
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if (rc)
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return rc;
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rc = dsa_legacy_register();
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if (rc)
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return rc;
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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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dsa_slave_unregister_notifier();
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dev_remove_pack(&dsa_pack_type);
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dsa_legacy_unregister();
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destroy_workqueue(dsa_owq);
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}
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module_exit(dsa_cleanup_module);
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MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
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MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:dsa");
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