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 | |
11 | /* If the port is under a VLAN-aware bridge, remove the VLAN header from the |
12 | * payload and move it into the DSA tag, which will make the switch classify |
13 | * the packet to the bridge VLAN. Otherwise, leave the classified VLAN at zero, |
14 | * which is the pvid of standalone and VLAN-unaware bridge ports. |
15 | */ |
16 | static void ocelot_xmit_get_vlan_info(struct sk_buff *skb, struct dsa_port *dp, |
17 | u64 *vlan_tci, u64 *tag_type) |
18 | { |
19 | struct net_device *br = dsa_port_bridge_dev_get(dp); |
20 | struct vlan_ethhdr *hdr; |
21 | u16 proto, tci; |
22 | |
23 | if (!br || !br_vlan_enabled(dev: br)) { |
24 | *vlan_tci = 0; |
25 | *tag_type = IFH_TAG_TYPE_C; |
26 | return; |
27 | } |
28 | |
29 | hdr = skb_vlan_eth_hdr(skb); |
30 | br_vlan_get_proto(dev: br, p_proto: &proto); |
31 | |
32 | if (ntohs(hdr->h_vlan_proto) == proto) { |
33 | vlan_remove_tag(skb, vlan_tci: &tci); |
34 | *vlan_tci = tci; |
35 | } else { |
36 | rcu_read_lock(); |
37 | br_vlan_get_pvid_rcu(dev: br, p_pvid: &tci); |
38 | rcu_read_unlock(); |
39 | *vlan_tci = tci; |
40 | } |
41 | |
42 | *tag_type = (proto != ETH_P_8021Q) ? IFH_TAG_TYPE_S : IFH_TAG_TYPE_C; |
43 | } |
44 | |
45 | static void ocelot_xmit_common(struct sk_buff *skb, struct net_device *netdev, |
46 | __be32 ifh_prefix, void **ifh) |
47 | { |
48 | struct dsa_port *dp = dsa_user_to_port(dev: netdev); |
49 | struct dsa_switch *ds = dp->ds; |
50 | u64 vlan_tci, tag_type; |
51 | void *injection; |
52 | __be32 *prefix; |
53 | u32 rew_op = 0; |
54 | u64 qos_class; |
55 | |
56 | ocelot_xmit_get_vlan_info(skb, dp, vlan_tci: &vlan_tci, tag_type: &tag_type); |
57 | |
58 | qos_class = netdev_get_num_tc(dev: netdev) ? |
59 | netdev_get_prio_tc_map(dev: netdev, prio: skb->priority) : skb->priority; |
60 | |
61 | injection = skb_push(skb, OCELOT_TAG_LEN); |
62 | prefix = skb_push(skb, OCELOT_SHORT_PREFIX_LEN); |
63 | |
64 | *prefix = ifh_prefix; |
65 | memset(injection, 0, OCELOT_TAG_LEN); |
66 | ocelot_ifh_set_bypass(injection, bypass: 1); |
67 | ocelot_ifh_set_src(injection, src: ds->num_ports); |
68 | ocelot_ifh_set_qos_class(injection, qos_class); |
69 | ocelot_ifh_set_vlan_tci(injection, vlan_tci); |
70 | ocelot_ifh_set_tag_type(injection, tag_type); |
71 | |
72 | rew_op = ocelot_ptp_rew_op(skb); |
73 | if (rew_op) |
74 | ocelot_ifh_set_rew_op(injection, rew_op); |
75 | |
76 | *ifh = injection; |
77 | } |
78 | |
79 | static struct sk_buff *ocelot_xmit(struct sk_buff *skb, |
80 | struct net_device *netdev) |
81 | { |
82 | struct dsa_port *dp = dsa_user_to_port(dev: netdev); |
83 | void *injection; |
84 | |
85 | ocelot_xmit_common(skb, netdev, cpu_to_be32(0x8880000a), ifh: &injection); |
86 | ocelot_ifh_set_dest(injection, BIT_ULL(dp->index)); |
87 | |
88 | return skb; |
89 | } |
90 | |
91 | static struct sk_buff *seville_xmit(struct sk_buff *skb, |
92 | struct net_device *netdev) |
93 | { |
94 | struct dsa_port *dp = dsa_user_to_port(dev: netdev); |
95 | void *injection; |
96 | |
97 | ocelot_xmit_common(skb, netdev, cpu_to_be32(0x88800005), ifh: &injection); |
98 | seville_ifh_set_dest(injection, BIT_ULL(dp->index)); |
99 | |
100 | return skb; |
101 | } |
102 | |
103 | static struct sk_buff *ocelot_rcv(struct sk_buff *skb, |
104 | struct net_device *netdev) |
105 | { |
106 | u64 src_port, qos_class; |
107 | u64 vlan_tci, tag_type; |
108 | u8 *start = skb->data; |
109 | struct dsa_port *dp; |
110 | u8 *; |
111 | u16 vlan_tpid; |
112 | u64 rew_val; |
113 | |
114 | /* Revert skb->data by the amount consumed by the DSA conduit, |
115 | * so it points to the beginning of the frame. |
116 | */ |
117 | skb_push(skb, ETH_HLEN); |
118 | /* We don't care about the short prefix, it is just for easy entrance |
119 | * into the DSA conduit's RX filter. Discard it now by moving it into |
120 | * the headroom. |
121 | */ |
122 | skb_pull(skb, OCELOT_SHORT_PREFIX_LEN); |
123 | /* And skb->data now points to the extraction frame header. |
124 | * Keep a pointer to it. |
125 | */ |
126 | extraction = skb->data; |
127 | /* Now the EFH is part of the headroom as well */ |
128 | skb_pull(skb, OCELOT_TAG_LEN); |
129 | /* Reset the pointer to the real MAC header */ |
130 | skb_reset_mac_header(skb); |
131 | skb_reset_mac_len(skb); |
132 | /* And move skb->data to the correct location again */ |
133 | skb_pull(skb, ETH_HLEN); |
134 | |
135 | /* Remove from inet csum the extraction header */ |
136 | skb_postpull_rcsum(skb, start, OCELOT_TOTAL_TAG_LEN); |
137 | |
138 | ocelot_xfh_get_src_port(extraction, src_port: &src_port); |
139 | ocelot_xfh_get_qos_class(extraction, qos_class: &qos_class); |
140 | ocelot_xfh_get_tag_type(extraction, tag_type: &tag_type); |
141 | ocelot_xfh_get_vlan_tci(extraction, vlan_tci: &vlan_tci); |
142 | ocelot_xfh_get_rew_val(extraction, rew_val: &rew_val); |
143 | |
144 | skb->dev = dsa_conduit_find_user(dev: netdev, device: 0, port: src_port); |
145 | if (!skb->dev) |
146 | /* The switch will reflect back some frames sent through |
147 | * sockets opened on the bare DSA conduit. These will come back |
148 | * with src_port equal to the index of the CPU port, for which |
149 | * there is no user registered. So don't print any error |
150 | * message here (ignore and drop those frames). |
151 | */ |
152 | return NULL; |
153 | |
154 | dsa_default_offload_fwd_mark(skb); |
155 | skb->priority = qos_class; |
156 | OCELOT_SKB_CB(skb)->tstamp_lo = rew_val; |
157 | |
158 | /* Ocelot switches copy frames unmodified to the CPU. However, it is |
159 | * possible for the user to request a VLAN modification through |
160 | * VCAP_IS1_ACT_VID_REPLACE_ENA. In this case, what will happen is that |
161 | * the VLAN ID field from the Extraction Header gets updated, but the |
162 | * 802.1Q header does not (the classified VLAN only becomes visible on |
163 | * egress through the "port tag" of front-panel ports). |
164 | * So, for traffic extracted by the CPU, we want to pick up the |
165 | * classified VLAN and manually replace the existing 802.1Q header from |
166 | * the packet with it, so that the operating system is always up to |
167 | * date with the result of tc-vlan actions. |
168 | * NOTE: In VLAN-unaware mode, we don't want to do that, we want the |
169 | * frame to remain unmodified, because the classified VLAN is always |
170 | * equal to the pvid of the ingress port and should not be used for |
171 | * processing. |
172 | */ |
173 | dp = dsa_user_to_port(dev: skb->dev); |
174 | vlan_tpid = tag_type ? ETH_P_8021AD : ETH_P_8021Q; |
175 | |
176 | if (dsa_port_is_vlan_filtering(dp) && |
177 | eth_hdr(skb)->h_proto == htons(vlan_tpid)) { |
178 | u16 dummy_vlan_tci; |
179 | |
180 | skb_push_rcsum(skb, ETH_HLEN); |
181 | __skb_vlan_pop(skb, vlan_tci: &dummy_vlan_tci); |
182 | skb_pull_rcsum(skb, ETH_HLEN); |
183 | __vlan_hwaccel_put_tag(skb, htons(vlan_tpid), vlan_tci); |
184 | } |
185 | |
186 | return skb; |
187 | } |
188 | |
189 | static const struct dsa_device_ops ocelot_netdev_ops = { |
190 | .name = OCELOT_NAME, |
191 | .proto = DSA_TAG_PROTO_OCELOT, |
192 | .xmit = ocelot_xmit, |
193 | .rcv = ocelot_rcv, |
194 | .needed_headroom = OCELOT_TOTAL_TAG_LEN, |
195 | .promisc_on_conduit = true, |
196 | }; |
197 | |
198 | DSA_TAG_DRIVER(ocelot_netdev_ops); |
199 | MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_OCELOT, OCELOT_NAME); |
200 | |
201 | static const struct dsa_device_ops seville_netdev_ops = { |
202 | .name = SEVILLE_NAME, |
203 | .proto = DSA_TAG_PROTO_SEVILLE, |
204 | .xmit = seville_xmit, |
205 | .rcv = ocelot_rcv, |
206 | .needed_headroom = OCELOT_TOTAL_TAG_LEN, |
207 | .promisc_on_conduit = true, |
208 | }; |
209 | |
210 | DSA_TAG_DRIVER(seville_netdev_ops); |
211 | MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SEVILLE, SEVILLE_NAME); |
212 | |
213 | static struct dsa_tag_driver *ocelot_tag_driver_array[] = { |
214 | &DSA_TAG_DRIVER_NAME(ocelot_netdev_ops), |
215 | &DSA_TAG_DRIVER_NAME(seville_netdev_ops), |
216 | }; |
217 | |
218 | module_dsa_tag_drivers(ocelot_tag_driver_array); |
219 | |
220 | MODULE_DESCRIPTION("DSA tag driver for Ocelot family of switches, using NPI port" ); |
221 | MODULE_LICENSE("GPL v2" ); |
222 | |