1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright 2019 NXP Semiconductors 3 */ 4 #include <linux/dsa/ocelot.h> 5 #include <soc/mscc/ocelot.h> 6 #include "dsa_priv.h" 7 8 static void ocelot_xmit_ptp(struct dsa_port *dp, void *injection, 9 struct sk_buff *clone) 10 { 11 struct ocelot *ocelot = dp->ds->priv; 12 struct ocelot_port *ocelot_port; 13 u64 rew_op; 14 15 ocelot_port = ocelot->ports[dp->index]; 16 rew_op = ocelot_port->ptp_cmd; 17 18 /* Retrieve timestamp ID populated inside skb->cb[0] of the 19 * clone by ocelot_port_add_txtstamp_skb 20 */ 21 if (ocelot_port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP) 22 rew_op |= clone->cb[0] << 3; 23 24 ocelot_ifh_set_rew_op(injection, rew_op); 25 } 26 27 static void ocelot_xmit_common(struct sk_buff *skb, struct net_device *netdev, 28 __be32 ifh_prefix, void **ifh) 29 { 30 struct dsa_port *dp = dsa_slave_to_port(netdev); 31 struct sk_buff *clone = DSA_SKB_CB(skb)->clone; 32 struct dsa_switch *ds = dp->ds; 33 void *injection; 34 __be32 *prefix; 35 36 injection = skb_push(skb, OCELOT_TAG_LEN); 37 prefix = skb_push(skb, OCELOT_SHORT_PREFIX_LEN); 38 39 *prefix = ifh_prefix; 40 memset(injection, 0, OCELOT_TAG_LEN); 41 ocelot_ifh_set_bypass(injection, 1); 42 ocelot_ifh_set_src(injection, ds->num_ports); 43 ocelot_ifh_set_qos_class(injection, skb->priority); 44 45 /* TX timestamping was requested */ 46 if (clone) 47 ocelot_xmit_ptp(dp, injection, clone); 48 49 *ifh = injection; 50 } 51 52 static struct sk_buff *ocelot_xmit(struct sk_buff *skb, 53 struct net_device *netdev) 54 { 55 struct dsa_port *dp = dsa_slave_to_port(netdev); 56 void *injection; 57 58 ocelot_xmit_common(skb, netdev, cpu_to_be32(0x8880000a), &injection); 59 ocelot_ifh_set_dest(injection, BIT_ULL(dp->index)); 60 61 return skb; 62 } 63 64 static struct sk_buff *seville_xmit(struct sk_buff *skb, 65 struct net_device *netdev) 66 { 67 struct dsa_port *dp = dsa_slave_to_port(netdev); 68 void *injection; 69 70 ocelot_xmit_common(skb, netdev, cpu_to_be32(0x88800005), &injection); 71 seville_ifh_set_dest(injection, BIT_ULL(dp->index)); 72 73 return skb; 74 } 75 76 static struct sk_buff *ocelot_rcv(struct sk_buff *skb, 77 struct net_device *netdev, 78 struct packet_type *pt) 79 { 80 u64 src_port, qos_class; 81 u64 vlan_tci, tag_type; 82 u8 *start = skb->data; 83 struct dsa_port *dp; 84 u8 *extraction; 85 u16 vlan_tpid; 86 u64 cpuq; 87 88 /* Revert skb->data by the amount consumed by the DSA master, 89 * so it points to the beginning of the frame. 90 */ 91 skb_push(skb, ETH_HLEN); 92 /* We don't care about the short prefix, it is just for easy entrance 93 * into the DSA master's RX filter. Discard it now by moving it into 94 * the headroom. 95 */ 96 skb_pull(skb, OCELOT_SHORT_PREFIX_LEN); 97 /* And skb->data now points to the extraction frame header. 98 * Keep a pointer to it. 99 */ 100 extraction = skb->data; 101 /* Now the EFH is part of the headroom as well */ 102 skb_pull(skb, OCELOT_TAG_LEN); 103 /* Reset the pointer to the real MAC header */ 104 skb_reset_mac_header(skb); 105 skb_reset_mac_len(skb); 106 /* And move skb->data to the correct location again */ 107 skb_pull(skb, ETH_HLEN); 108 109 /* Remove from inet csum the extraction header */ 110 skb_postpull_rcsum(skb, start, OCELOT_TOTAL_TAG_LEN); 111 112 ocelot_xfh_get_src_port(extraction, &src_port); 113 ocelot_xfh_get_qos_class(extraction, &qos_class); 114 ocelot_xfh_get_tag_type(extraction, &tag_type); 115 ocelot_xfh_get_vlan_tci(extraction, &vlan_tci); 116 ocelot_xfh_get_cpuq(extraction, &cpuq); 117 118 skb->dev = dsa_master_find_slave(netdev, 0, src_port); 119 if (!skb->dev) 120 /* The switch will reflect back some frames sent through 121 * sockets opened on the bare DSA master. These will come back 122 * with src_port equal to the index of the CPU port, for which 123 * there is no slave registered. So don't print any error 124 * message here (ignore and drop those frames). 125 */ 126 return NULL; 127 128 skb->offload_fwd_mark = 1; 129 skb->priority = qos_class; 130 131 #if IS_ENABLED(CONFIG_BRIDGE_MRP) 132 if (eth_hdr(skb)->h_proto == cpu_to_be16(ETH_P_MRP) && 133 cpuq & BIT(OCELOT_MRP_CPUQ)) 134 skb->offload_fwd_mark = 0; 135 #endif 136 137 /* Ocelot switches copy frames unmodified to the CPU. However, it is 138 * possible for the user to request a VLAN modification through 139 * VCAP_IS1_ACT_VID_REPLACE_ENA. In this case, what will happen is that 140 * the VLAN ID field from the Extraction Header gets updated, but the 141 * 802.1Q header does not (the classified VLAN only becomes visible on 142 * egress through the "port tag" of front-panel ports). 143 * So, for traffic extracted by the CPU, we want to pick up the 144 * classified VLAN and manually replace the existing 802.1Q header from 145 * the packet with it, so that the operating system is always up to 146 * date with the result of tc-vlan actions. 147 * NOTE: In VLAN-unaware mode, we don't want to do that, we want the 148 * frame to remain unmodified, because the classified VLAN is always 149 * equal to the pvid of the ingress port and should not be used for 150 * processing. 151 */ 152 dp = dsa_slave_to_port(skb->dev); 153 vlan_tpid = tag_type ? ETH_P_8021AD : ETH_P_8021Q; 154 155 if (dsa_port_is_vlan_filtering(dp) && 156 eth_hdr(skb)->h_proto == htons(vlan_tpid)) { 157 u16 dummy_vlan_tci; 158 159 skb_push_rcsum(skb, ETH_HLEN); 160 __skb_vlan_pop(skb, &dummy_vlan_tci); 161 skb_pull_rcsum(skb, ETH_HLEN); 162 __vlan_hwaccel_put_tag(skb, htons(vlan_tpid), vlan_tci); 163 } 164 165 return skb; 166 } 167 168 static const struct dsa_device_ops ocelot_netdev_ops = { 169 .name = "ocelot", 170 .proto = DSA_TAG_PROTO_OCELOT, 171 .xmit = ocelot_xmit, 172 .rcv = ocelot_rcv, 173 .overhead = OCELOT_TOTAL_TAG_LEN, 174 .promisc_on_master = true, 175 }; 176 177 DSA_TAG_DRIVER(ocelot_netdev_ops); 178 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_OCELOT); 179 180 static const struct dsa_device_ops seville_netdev_ops = { 181 .name = "seville", 182 .proto = DSA_TAG_PROTO_SEVILLE, 183 .xmit = seville_xmit, 184 .rcv = ocelot_rcv, 185 .overhead = OCELOT_TOTAL_TAG_LEN, 186 .promisc_on_master = true, 187 }; 188 189 DSA_TAG_DRIVER(seville_netdev_ops); 190 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SEVILLE); 191 192 static struct dsa_tag_driver *ocelot_tag_driver_array[] = { 193 &DSA_TAG_DRIVER_NAME(ocelot_netdev_ops), 194 &DSA_TAG_DRIVER_NAME(seville_netdev_ops), 195 }; 196 197 module_dsa_tag_drivers(ocelot_tag_driver_array); 198 199 MODULE_LICENSE("GPL v2"); 200