1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright 2019 NXP
3 */
4 #include <linux/dsa/ocelot.h>
5
6 #include "tag.h"
7
8 #define OCELOT_NAME "ocelot"
9 #define SEVILLE_NAME "seville"
10
ocelot_xmit_common(struct sk_buff * skb,struct net_device * netdev,__be32 ifh_prefix,void ** ifh)11 static void ocelot_xmit_common(struct sk_buff *skb, struct net_device *netdev,
12 __be32 ifh_prefix, void **ifh)
13 {
14 struct dsa_port *dp = dsa_slave_to_port(netdev);
15 struct dsa_switch *ds = dp->ds;
16 u64 vlan_tci, tag_type;
17 void *injection;
18 __be32 *prefix;
19 u32 rew_op = 0;
20 u64 qos_class;
21
22 ocelot_xmit_get_vlan_info(skb, dsa_port_bridge_dev_get(dp), &vlan_tci,
23 &tag_type);
24
25 qos_class = netdev_get_num_tc(netdev) ?
26 netdev_get_prio_tc_map(netdev, skb->priority) : skb->priority;
27
28 injection = skb_push(skb, OCELOT_TAG_LEN);
29 prefix = skb_push(skb, OCELOT_SHORT_PREFIX_LEN);
30
31 *prefix = ifh_prefix;
32 memset(injection, 0, OCELOT_TAG_LEN);
33 ocelot_ifh_set_bypass(injection, 1);
34 ocelot_ifh_set_src(injection, ds->num_ports);
35 ocelot_ifh_set_qos_class(injection, qos_class);
36 ocelot_ifh_set_vlan_tci(injection, vlan_tci);
37 ocelot_ifh_set_tag_type(injection, tag_type);
38
39 rew_op = ocelot_ptp_rew_op(skb);
40 if (rew_op)
41 ocelot_ifh_set_rew_op(injection, rew_op);
42
43 *ifh = injection;
44 }
45
ocelot_xmit(struct sk_buff * skb,struct net_device * netdev)46 static struct sk_buff *ocelot_xmit(struct sk_buff *skb,
47 struct net_device *netdev)
48 {
49 struct dsa_port *dp = dsa_slave_to_port(netdev);
50 void *injection;
51
52 ocelot_xmit_common(skb, netdev, cpu_to_be32(0x8880000a), &injection);
53 ocelot_ifh_set_dest(injection, BIT_ULL(dp->index));
54
55 return skb;
56 }
57
seville_xmit(struct sk_buff * skb,struct net_device * netdev)58 static struct sk_buff *seville_xmit(struct sk_buff *skb,
59 struct net_device *netdev)
60 {
61 struct dsa_port *dp = dsa_slave_to_port(netdev);
62 void *injection;
63
64 ocelot_xmit_common(skb, netdev, cpu_to_be32(0x88800005), &injection);
65 seville_ifh_set_dest(injection, BIT_ULL(dp->index));
66
67 return skb;
68 }
69
ocelot_rcv(struct sk_buff * skb,struct net_device * netdev)70 static struct sk_buff *ocelot_rcv(struct sk_buff *skb,
71 struct net_device *netdev)
72 {
73 u64 src_port, qos_class;
74 u64 vlan_tci, tag_type;
75 u8 *start = skb->data;
76 struct dsa_port *dp;
77 u8 *extraction;
78 u16 vlan_tpid;
79 u64 rew_val;
80
81 /* Revert skb->data by the amount consumed by the DSA master,
82 * so it points to the beginning of the frame.
83 */
84 skb_push(skb, ETH_HLEN);
85 /* We don't care about the short prefix, it is just for easy entrance
86 * into the DSA master's RX filter. Discard it now by moving it into
87 * the headroom.
88 */
89 skb_pull(skb, OCELOT_SHORT_PREFIX_LEN);
90 /* And skb->data now points to the extraction frame header.
91 * Keep a pointer to it.
92 */
93 extraction = skb->data;
94 /* Now the EFH is part of the headroom as well */
95 skb_pull(skb, OCELOT_TAG_LEN);
96 /* Reset the pointer to the real MAC header */
97 skb_reset_mac_header(skb);
98 skb_reset_mac_len(skb);
99 /* And move skb->data to the correct location again */
100 skb_pull(skb, ETH_HLEN);
101
102 /* Remove from inet csum the extraction header */
103 skb_postpull_rcsum(skb, start, OCELOT_TOTAL_TAG_LEN);
104
105 ocelot_xfh_get_src_port(extraction, &src_port);
106 ocelot_xfh_get_qos_class(extraction, &qos_class);
107 ocelot_xfh_get_tag_type(extraction, &tag_type);
108 ocelot_xfh_get_vlan_tci(extraction, &vlan_tci);
109 ocelot_xfh_get_rew_val(extraction, &rew_val);
110
111 skb->dev = dsa_master_find_slave(netdev, 0, src_port);
112 if (!skb->dev)
113 /* The switch will reflect back some frames sent through
114 * sockets opened on the bare DSA master. These will come back
115 * with src_port equal to the index of the CPU port, for which
116 * there is no slave registered. So don't print any error
117 * message here (ignore and drop those frames).
118 */
119 return NULL;
120
121 dsa_default_offload_fwd_mark(skb);
122 skb->priority = qos_class;
123 OCELOT_SKB_CB(skb)->tstamp_lo = rew_val;
124
125 /* Ocelot switches copy frames unmodified to the CPU. However, it is
126 * possible for the user to request a VLAN modification through
127 * VCAP_IS1_ACT_VID_REPLACE_ENA. In this case, what will happen is that
128 * the VLAN ID field from the Extraction Header gets updated, but the
129 * 802.1Q header does not (the classified VLAN only becomes visible on
130 * egress through the "port tag" of front-panel ports).
131 * So, for traffic extracted by the CPU, we want to pick up the
132 * classified VLAN and manually replace the existing 802.1Q header from
133 * the packet with it, so that the operating system is always up to
134 * date with the result of tc-vlan actions.
135 * NOTE: In VLAN-unaware mode, we don't want to do that, we want the
136 * frame to remain unmodified, because the classified VLAN is always
137 * equal to the pvid of the ingress port and should not be used for
138 * processing.
139 */
140 dp = dsa_slave_to_port(skb->dev);
141 vlan_tpid = tag_type ? ETH_P_8021AD : ETH_P_8021Q;
142
143 if (dsa_port_is_vlan_filtering(dp) &&
144 eth_hdr(skb)->h_proto == htons(vlan_tpid)) {
145 u16 dummy_vlan_tci;
146
147 skb_push_rcsum(skb, ETH_HLEN);
148 __skb_vlan_pop(skb, &dummy_vlan_tci);
149 skb_pull_rcsum(skb, ETH_HLEN);
150 __vlan_hwaccel_put_tag(skb, htons(vlan_tpid), vlan_tci);
151 }
152
153 return skb;
154 }
155
156 static const struct dsa_device_ops ocelot_netdev_ops = {
157 .name = OCELOT_NAME,
158 .proto = DSA_TAG_PROTO_OCELOT,
159 .xmit = ocelot_xmit,
160 .rcv = ocelot_rcv,
161 .needed_headroom = OCELOT_TOTAL_TAG_LEN,
162 .promisc_on_master = true,
163 };
164
165 DSA_TAG_DRIVER(ocelot_netdev_ops);
166 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_OCELOT, OCELOT_NAME);
167
168 static const struct dsa_device_ops seville_netdev_ops = {
169 .name = SEVILLE_NAME,
170 .proto = DSA_TAG_PROTO_SEVILLE,
171 .xmit = seville_xmit,
172 .rcv = ocelot_rcv,
173 .needed_headroom = OCELOT_TOTAL_TAG_LEN,
174 .promisc_on_master = true,
175 };
176
177 DSA_TAG_DRIVER(seville_netdev_ops);
178 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SEVILLE, SEVILLE_NAME);
179
180 static struct dsa_tag_driver *ocelot_tag_driver_array[] = {
181 &DSA_TAG_DRIVER_NAME(ocelot_netdev_ops),
182 &DSA_TAG_DRIVER_NAME(seville_netdev_ops),
183 };
184
185 module_dsa_tag_drivers(ocelot_tag_driver_array);
186
187 MODULE_LICENSE("GPL v2");
188