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