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(br)) { 24 *vlan_tci = 0; 25 *tag_type = IFH_TAG_TYPE_C; 26 return; 27 } 28 29 hdr = (struct vlan_ethhdr *)skb_mac_header(skb); 30 br_vlan_get_proto(br, &proto); 31 32 if (ntohs(hdr->h_vlan_proto) == proto) { 33 __skb_vlan_pop(skb, &tci); 34 *vlan_tci = tci; 35 } else { 36 rcu_read_lock(); 37 br_vlan_get_pvid_rcu(br, &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_slave_to_port(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, &tag_type); 57 58 qos_class = netdev_get_num_tc(netdev) ? 59 netdev_get_prio_tc_map(netdev, 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, 1); 67 ocelot_ifh_set_src(injection, 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_slave_to_port(netdev); 83 void *injection; 84 85 ocelot_xmit_common(skb, netdev, cpu_to_be32(0x8880000a), &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_slave_to_port(netdev); 95 void *injection; 96 97 ocelot_xmit_common(skb, netdev, cpu_to_be32(0x88800005), &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 *extraction; 111 u16 vlan_tpid; 112 u64 rew_val; 113 114 /* Revert skb->data by the amount consumed by the DSA master, 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 master'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); 139 ocelot_xfh_get_qos_class(extraction, &qos_class); 140 ocelot_xfh_get_tag_type(extraction, &tag_type); 141 ocelot_xfh_get_vlan_tci(extraction, &vlan_tci); 142 ocelot_xfh_get_rew_val(extraction, &rew_val); 143 144 skb->dev = dsa_master_find_slave(netdev, 0, src_port); 145 if (!skb->dev) 146 /* The switch will reflect back some frames sent through 147 * sockets opened on the bare DSA master. These will come back 148 * with src_port equal to the index of the CPU port, for which 149 * there is no slave 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_slave_to_port(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, &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_master = 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_master = 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_LICENSE("GPL v2"); 221