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// SPDX-License-Identifier: GPL-2.0
/* Copyright 2019 NXP
*/
#include <linux/dsa/ocelot.h>
#include "dsa_priv.h"
/* If the port is under a VLAN-aware bridge, remove the VLAN header from the
* payload and move it into the DSA tag, which will make the switch classify
* the packet to the bridge VLAN. Otherwise, leave the classified VLAN at zero,
* which is the pvid of standalone and VLAN-unaware bridge ports.
*/
static void ocelot_xmit_get_vlan_info(struct sk_buff *skb, struct dsa_port *dp,
u64 *vlan_tci, u64 *tag_type)
{
struct net_device *br = READ_ONCE(dp->bridge_dev);
struct vlan_ethhdr *hdr;
u16 proto, tci;
if (!br || !br_vlan_enabled(br)) {
*vlan_tci = 0;
*tag_type = IFH_TAG_TYPE_C;
return;
}
hdr = (struct vlan_ethhdr *)skb_mac_header(skb);
br_vlan_get_proto(br, &proto);
if (ntohs(hdr->h_vlan_proto) == proto) {
__skb_vlan_pop(skb, &tci);
*vlan_tci = tci;
} else {
rcu_read_lock();
br_vlan_get_pvid_rcu(br, &tci);
rcu_read_unlock();
*vlan_tci = tci;
}
*tag_type = (proto != ETH_P_8021Q) ? IFH_TAG_TYPE_S : IFH_TAG_TYPE_C;
}
static void ocelot_xmit_common(struct sk_buff *skb, struct net_device *netdev,
__be32 ifh_prefix, void **ifh)
{
struct dsa_port *dp = dsa_slave_to_port(netdev);
struct dsa_switch *ds = dp->ds;
u64 vlan_tci, tag_type;
void *injection;
__be32 *prefix;
u32 rew_op = 0;
ocelot_xmit_get_vlan_info(skb, dp, &vlan_tci, &tag_type);
injection = skb_push(skb, OCELOT_TAG_LEN);
prefix = skb_push(skb, OCELOT_SHORT_PREFIX_LEN);
*prefix = ifh_prefix;
memset(injection, 0, OCELOT_TAG_LEN);
ocelot_ifh_set_bypass(injection, 1);
ocelot_ifh_set_src(injection, ds->num_ports);
ocelot_ifh_set_qos_class(injection, skb->priority);
ocelot_ifh_set_vlan_tci(injection, vlan_tci);
ocelot_ifh_set_tag_type(injection, tag_type);
rew_op = ocelot_ptp_rew_op(skb);
if (rew_op)
ocelot_ifh_set_rew_op(injection, rew_op);
*ifh = injection;
}
static struct sk_buff *ocelot_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct dsa_port *dp = dsa_slave_to_port(netdev);
void *injection;
ocelot_xmit_common(skb, netdev, cpu_to_be32(0x8880000a), &injection);
ocelot_ifh_set_dest(injection, BIT_ULL(dp->index));
return skb;
}
static struct sk_buff *seville_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct dsa_port *dp = dsa_slave_to_port(netdev);
void *injection;
ocelot_xmit_common(skb, netdev, cpu_to_be32(0x88800005), &injection);
seville_ifh_set_dest(injection, BIT_ULL(dp->index));
return skb;
}
static struct sk_buff *ocelot_rcv(struct sk_buff *skb,
struct net_device *netdev)
{
u64 src_port, qos_class;
u64 vlan_tci, tag_type;
u8 *start = skb->data;
struct dsa_port *dp;
u8 *extraction;
u16 vlan_tpid;
/* Revert skb->data by the amount consumed by the DSA master,
* so it points to the beginning of the frame.
*/
skb_push(skb, ETH_HLEN);
/* We don't care about the short prefix, it is just for easy entrance
* into the DSA master's RX filter. Discard it now by moving it into
* the headroom.
*/
skb_pull(skb, OCELOT_SHORT_PREFIX_LEN);
/* And skb->data now points to the extraction frame header.
* Keep a pointer to it.
*/
extraction = skb->data;
/* Now the EFH is part of the headroom as well */
skb_pull(skb, OCELOT_TAG_LEN);
/* Reset the pointer to the real MAC header */
skb_reset_mac_header(skb);
skb_reset_mac_len(skb);
/* And move skb->data to the correct location again */
skb_pull(skb, ETH_HLEN);
/* Remove from inet csum the extraction header */
skb_postpull_rcsum(skb, start, OCELOT_TOTAL_TAG_LEN);
ocelot_xfh_get_src_port(extraction, &src_port);
ocelot_xfh_get_qos_class(extraction, &qos_class);
ocelot_xfh_get_tag_type(extraction, &tag_type);
ocelot_xfh_get_vlan_tci(extraction, &vlan_tci);
skb->dev = dsa_master_find_slave(netdev, 0, src_port);
if (!skb->dev)
/* The switch will reflect back some frames sent through
* sockets opened on the bare DSA master. These will come back
* with src_port equal to the index of the CPU port, for which
* there is no slave registered. So don't print any error
* message here (ignore and drop those frames).
*/
return NULL;
dsa_default_offload_fwd_mark(skb);
skb->priority = qos_class;
/* Ocelot switches copy frames unmodified to the CPU. However, it is
* possible for the user to request a VLAN modification through
* VCAP_IS1_ACT_VID_REPLACE_ENA. In this case, what will happen is that
* the VLAN ID field from the Extraction Header gets updated, but the
* 802.1Q header does not (the classified VLAN only becomes visible on
* egress through the "port tag" of front-panel ports).
* So, for traffic extracted by the CPU, we want to pick up the
* classified VLAN and manually replace the existing 802.1Q header from
* the packet with it, so that the operating system is always up to
* date with the result of tc-vlan actions.
* NOTE: In VLAN-unaware mode, we don't want to do that, we want the
* frame to remain unmodified, because the classified VLAN is always
* equal to the pvid of the ingress port and should not be used for
* processing.
*/
dp = dsa_slave_to_port(skb->dev);
vlan_tpid = tag_type ? ETH_P_8021AD : ETH_P_8021Q;
if (dsa_port_is_vlan_filtering(dp) &&
eth_hdr(skb)->h_proto == htons(vlan_tpid)) {
u16 dummy_vlan_tci;
skb_push_rcsum(skb, ETH_HLEN);
__skb_vlan_pop(skb, &dummy_vlan_tci);
skb_pull_rcsum(skb, ETH_HLEN);
__vlan_hwaccel_put_tag(skb, htons(vlan_tpid), vlan_tci);
}
return skb;
}
static const struct dsa_device_ops ocelot_netdev_ops = {
.name = "ocelot",
.proto = DSA_TAG_PROTO_OCELOT,
.xmit = ocelot_xmit,
.rcv = ocelot_rcv,
.needed_headroom = OCELOT_TOTAL_TAG_LEN,
.promisc_on_master = true,
};
DSA_TAG_DRIVER(ocelot_netdev_ops);
MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_OCELOT);
static const struct dsa_device_ops seville_netdev_ops = {
.name = "seville",
.proto = DSA_TAG_PROTO_SEVILLE,
.xmit = seville_xmit,
.rcv = ocelot_rcv,
.needed_headroom = OCELOT_TOTAL_TAG_LEN,
.promisc_on_master = true,
};
DSA_TAG_DRIVER(seville_netdev_ops);
MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SEVILLE);
static struct dsa_tag_driver *ocelot_tag_driver_array[] = {
&DSA_TAG_DRIVER_NAME(ocelot_netdev_ops),
&DSA_TAG_DRIVER_NAME(seville_netdev_ops),
};
module_dsa_tag_drivers(ocelot_tag_driver_array);
MODULE_LICENSE("GPL v2");
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