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