1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright 2019 NXP 3 */ 4 #include <linux/dsa/ocelot.h> 5 #include "dsa_priv.h" 6 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. 11 */ 12 static void ocelot_xmit_get_vlan_info(struct sk_buff *skb, struct dsa_port *dp, 13 u64 *vlan_tci, u64 *tag_type) 14 { 15 struct net_device *br = dsa_port_bridge_dev_get(dp); 16 struct vlan_ethhdr *hdr; 17 u16 proto, tci; 18 19 if (!br || !br_vlan_enabled(br)) { 20 *vlan_tci = 0; 21 *tag_type = IFH_TAG_TYPE_C; 22 return; 23 } 24 25 hdr = (struct vlan_ethhdr *)skb_mac_header(skb); 26 br_vlan_get_proto(br, &proto); 27 28 if (ntohs(hdr->h_vlan_proto) == proto) { 29 __skb_vlan_pop(skb, &tci); 30 *vlan_tci = tci; 31 } else { 32 rcu_read_lock(); 33 br_vlan_get_pvid_rcu(br, &tci); 34 rcu_read_unlock(); 35 *vlan_tci = tci; 36 } 37 38 *tag_type = (proto != ETH_P_8021Q) ? IFH_TAG_TYPE_S : IFH_TAG_TYPE_C; 39 } 40 41 static void ocelot_xmit_common(struct sk_buff *skb, struct net_device *netdev, 42 __be32 ifh_prefix, void **ifh) 43 { 44 struct dsa_port *dp = dsa_slave_to_port(netdev); 45 struct dsa_switch *ds = dp->ds; 46 u64 vlan_tci, tag_type; 47 void *injection; 48 __be32 *prefix; 49 u32 rew_op = 0; 50 u64 qos_class; 51 52 ocelot_xmit_get_vlan_info(skb, dp, &vlan_tci, &tag_type); 53 54 qos_class = netdev_get_num_tc(netdev) ? 55 netdev_get_prio_tc_map(netdev, skb->priority) : skb->priority; 56 57 injection = skb_push(skb, OCELOT_TAG_LEN); 58 prefix = skb_push(skb, OCELOT_SHORT_PREFIX_LEN); 59 60 *prefix = ifh_prefix; 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); 67 68 rew_op = ocelot_ptp_rew_op(skb); 69 if (rew_op) 70 ocelot_ifh_set_rew_op(injection, rew_op); 71 72 *ifh = injection; 73 } 74 75 static struct sk_buff *ocelot_xmit(struct sk_buff *skb, 76 struct net_device *netdev) 77 { 78 struct dsa_port *dp = dsa_slave_to_port(netdev); 79 void *injection; 80 81 ocelot_xmit_common(skb, netdev, cpu_to_be32(0x8880000a), &injection); 82 ocelot_ifh_set_dest(injection, BIT_ULL(dp->index)); 83 84 return skb; 85 } 86 87 static struct sk_buff *seville_xmit(struct sk_buff *skb, 88 struct net_device *netdev) 89 { 90 struct dsa_port *dp = dsa_slave_to_port(netdev); 91 void *injection; 92 93 ocelot_xmit_common(skb, netdev, cpu_to_be32(0x88800005), &injection); 94 seville_ifh_set_dest(injection, BIT_ULL(dp->index)); 95 96 return skb; 97 } 98 99 static struct sk_buff *ocelot_rcv(struct sk_buff *skb, 100 struct net_device *netdev) 101 { 102 u64 src_port, qos_class; 103 u64 vlan_tci, tag_type; 104 u8 *start = skb->data; 105 struct dsa_port *dp; 106 u8 *extraction; 107 u16 vlan_tpid; 108 u64 rew_val; 109 110 /* Revert skb->data by the amount consumed by the DSA master, 111 * so it points to the beginning of the frame. 112 */ 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 116 * the headroom. 117 */ 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. 121 */ 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); 130 131 /* Remove from inet csum the extraction header */ 132 skb_postpull_rcsum(skb, start, OCELOT_TOTAL_TAG_LEN); 133 134 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); 139 140 skb->dev = dsa_master_find_slave(netdev, 0, src_port); 141 if (!skb->dev) 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). 147 */ 148 return NULL; 149 150 dsa_default_offload_fwd_mark(skb); 151 skb->priority = qos_class; 152 OCELOT_SKB_CB(skb)->tstamp_lo = rew_val; 153 154 /* 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 167 * processing. 168 */ 169 dp = dsa_slave_to_port(skb->dev); 170 vlan_tpid = tag_type ? ETH_P_8021AD : ETH_P_8021Q; 171 172 if (dsa_port_is_vlan_filtering(dp) && 173 eth_hdr(skb)->h_proto == htons(vlan_tpid)) { 174 u16 dummy_vlan_tci; 175 176 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); 180 } 181 182 return skb; 183 } 184 185 static const struct dsa_device_ops ocelot_netdev_ops = { 186 .name = "ocelot", 187 .proto = DSA_TAG_PROTO_OCELOT, 188 .xmit = ocelot_xmit, 189 .rcv = ocelot_rcv, 190 .needed_headroom = OCELOT_TOTAL_TAG_LEN, 191 .promisc_on_master = true, 192 }; 193 194 DSA_TAG_DRIVER(ocelot_netdev_ops); 195 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_OCELOT); 196 197 static const struct dsa_device_ops seville_netdev_ops = { 198 .name = "seville", 199 .proto = DSA_TAG_PROTO_SEVILLE, 200 .xmit = seville_xmit, 201 .rcv = ocelot_rcv, 202 .needed_headroom = OCELOT_TOTAL_TAG_LEN, 203 .promisc_on_master = true, 204 }; 205 206 DSA_TAG_DRIVER(seville_netdev_ops); 207 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SEVILLE); 208 209 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), 212 }; 213 214 module_dsa_tag_drivers(ocelot_tag_driver_array); 215 216 MODULE_LICENSE("GPL v2"); 217