1 // SPDX-License-Identifier: GPL-2.0
4 #include <linux/dsa/ocelot.h>
7 /* If the port is under a VLAN-aware bridge, remove the VLAN header from the
8 * payload and move it into the DSA tag, which will make the switch classify
9 * the packet to the bridge VLAN. Otherwise, leave the classified VLAN at zero,
10 * which is the pvid of standalone and VLAN-unaware bridge ports.
12 static void ocelot_xmit_get_vlan_info(struct sk_buff *skb, struct dsa_port *dp,
13 u64 *vlan_tci, u64 *tag_type)
15 struct net_device *br = dsa_port_bridge_dev_get(dp);
16 struct vlan_ethhdr *hdr;
19 if (!br || !br_vlan_enabled(br)) {
21 *tag_type = IFH_TAG_TYPE_C;
25 hdr = (struct vlan_ethhdr *)skb_mac_header(skb);
26 br_vlan_get_proto(br, &proto);
28 if (ntohs(hdr->h_vlan_proto) == proto) {
29 __skb_vlan_pop(skb, &tci);
33 br_vlan_get_pvid_rcu(br, &tci);
38 *tag_type = (proto != ETH_P_8021Q) ? IFH_TAG_TYPE_S : IFH_TAG_TYPE_C;
41 static void ocelot_xmit_common(struct sk_buff *skb, struct net_device *netdev,
42 __be32 ifh_prefix, void **ifh)
44 struct dsa_port *dp = dsa_slave_to_port(netdev);
45 struct dsa_switch *ds = dp->ds;
46 u64 vlan_tci, tag_type;
52 ocelot_xmit_get_vlan_info(skb, dp, &vlan_tci, &tag_type);
54 qos_class = netdev_get_num_tc(netdev) ?
55 netdev_get_prio_tc_map(netdev, skb->priority) : skb->priority;
57 injection = skb_push(skb, OCELOT_TAG_LEN);
58 prefix = skb_push(skb, OCELOT_SHORT_PREFIX_LEN);
61 memset(injection, 0, OCELOT_TAG_LEN);
62 ocelot_ifh_set_bypass(injection, 1);
63 ocelot_ifh_set_src(injection, ds->num_ports);
64 ocelot_ifh_set_qos_class(injection, qos_class);
65 ocelot_ifh_set_vlan_tci(injection, vlan_tci);
66 ocelot_ifh_set_tag_type(injection, tag_type);
68 rew_op = ocelot_ptp_rew_op(skb);
70 ocelot_ifh_set_rew_op(injection, rew_op);
75 static struct sk_buff *ocelot_xmit(struct sk_buff *skb,
76 struct net_device *netdev)
78 struct dsa_port *dp = dsa_slave_to_port(netdev);
81 ocelot_xmit_common(skb, netdev, cpu_to_be32(0x8880000a), &injection);
82 ocelot_ifh_set_dest(injection, BIT_ULL(dp->index));
87 static struct sk_buff *seville_xmit(struct sk_buff *skb,
88 struct net_device *netdev)
90 struct dsa_port *dp = dsa_slave_to_port(netdev);
93 ocelot_xmit_common(skb, netdev, cpu_to_be32(0x88800005), &injection);
94 seville_ifh_set_dest(injection, BIT_ULL(dp->index));
99 static struct sk_buff *ocelot_rcv(struct sk_buff *skb,
100 struct net_device *netdev)
102 u64 src_port, qos_class;
103 u64 vlan_tci, tag_type;
104 u8 *start = skb->data;
110 /* Revert skb->data by the amount consumed by the DSA master,
111 * so it points to the beginning of the frame.
113 skb_push(skb, ETH_HLEN);
114 /* We don't care about the short prefix, it is just for easy entrance
115 * into the DSA master's RX filter. Discard it now by moving it into
118 skb_pull(skb, OCELOT_SHORT_PREFIX_LEN);
119 /* And skb->data now points to the extraction frame header.
120 * Keep a pointer to it.
122 extraction = skb->data;
123 /* Now the EFH is part of the headroom as well */
124 skb_pull(skb, OCELOT_TAG_LEN);
125 /* Reset the pointer to the real MAC header */
126 skb_reset_mac_header(skb);
127 skb_reset_mac_len(skb);
128 /* And move skb->data to the correct location again */
129 skb_pull(skb, ETH_HLEN);
131 /* Remove from inet csum the extraction header */
132 skb_postpull_rcsum(skb, start, OCELOT_TOTAL_TAG_LEN);
134 ocelot_xfh_get_src_port(extraction, &src_port);
135 ocelot_xfh_get_qos_class(extraction, &qos_class);
136 ocelot_xfh_get_tag_type(extraction, &tag_type);
137 ocelot_xfh_get_vlan_tci(extraction, &vlan_tci);
138 ocelot_xfh_get_rew_val(extraction, &rew_val);
140 skb->dev = dsa_master_find_slave(netdev, 0, src_port);
142 /* The switch will reflect back some frames sent through
143 * sockets opened on the bare DSA master. These will come back
144 * with src_port equal to the index of the CPU port, for which
145 * there is no slave registered. So don't print any error
146 * message here (ignore and drop those frames).
150 dsa_default_offload_fwd_mark(skb);
151 skb->priority = qos_class;
152 OCELOT_SKB_CB(skb)->tstamp_lo = rew_val;
154 /* Ocelot switches copy frames unmodified to the CPU. However, it is
155 * possible for the user to request a VLAN modification through
156 * VCAP_IS1_ACT_VID_REPLACE_ENA. In this case, what will happen is that
157 * the VLAN ID field from the Extraction Header gets updated, but the
158 * 802.1Q header does not (the classified VLAN only becomes visible on
159 * egress through the "port tag" of front-panel ports).
160 * So, for traffic extracted by the CPU, we want to pick up the
161 * classified VLAN and manually replace the existing 802.1Q header from
162 * the packet with it, so that the operating system is always up to
163 * date with the result of tc-vlan actions.
164 * NOTE: In VLAN-unaware mode, we don't want to do that, we want the
165 * frame to remain unmodified, because the classified VLAN is always
166 * equal to the pvid of the ingress port and should not be used for
169 dp = dsa_slave_to_port(skb->dev);
170 vlan_tpid = tag_type ? ETH_P_8021AD : ETH_P_8021Q;
172 if (dsa_port_is_vlan_filtering(dp) &&
173 eth_hdr(skb)->h_proto == htons(vlan_tpid)) {
176 skb_push_rcsum(skb, ETH_HLEN);
177 __skb_vlan_pop(skb, &dummy_vlan_tci);
178 skb_pull_rcsum(skb, ETH_HLEN);
179 __vlan_hwaccel_put_tag(skb, htons(vlan_tpid), vlan_tci);
185 static const struct dsa_device_ops ocelot_netdev_ops = {
187 .proto = DSA_TAG_PROTO_OCELOT,
190 .needed_headroom = OCELOT_TOTAL_TAG_LEN,
191 .promisc_on_master = true,
194 DSA_TAG_DRIVER(ocelot_netdev_ops);
195 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_OCELOT);
197 static const struct dsa_device_ops seville_netdev_ops = {
199 .proto = DSA_TAG_PROTO_SEVILLE,
200 .xmit = seville_xmit,
202 .needed_headroom = OCELOT_TOTAL_TAG_LEN,
203 .promisc_on_master = true,
206 DSA_TAG_DRIVER(seville_netdev_ops);
207 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SEVILLE);
209 static struct dsa_tag_driver *ocelot_tag_driver_array[] = {
210 &DSA_TAG_DRIVER_NAME(ocelot_netdev_ops),
211 &DSA_TAG_DRIVER_NAME(seville_netdev_ops),
214 module_dsa_tag_drivers(ocelot_tag_driver_array);
216 MODULE_LICENSE("GPL v2");