1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
// 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 = dsa_port_bridge_dev_get(dp);
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;
u64 qos_class;
ocelot_xmit_get_vlan_info(skb, dp, &vlan_tci, &tag_type);
qos_class = netdev_get_num_tc(netdev) ?
netdev_get_prio_tc_map(netdev, skb->priority) : skb->priority;
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, qos_class);
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;
u64 rew_val;
/* 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);
ocelot_xfh_get_rew_val(extraction, &rew_val);
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_SKB_CB(skb)->tstamp_lo = rew_val;
/* 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");
|
