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_common(struct sk_buff *skb, struct net_device *netdev, 9 __be32 ifh_prefix, void **ifh) 10 { 11 struct dsa_port *dp = dsa_slave_to_port(netdev); 12 struct dsa_switch *ds = dp->ds; 13 void *injection; 14 __be32 *prefix; 15 u32 rew_op = 0; 16 17 injection = skb_push(skb, OCELOT_TAG_LEN); 18 prefix = skb_push(skb, OCELOT_SHORT_PREFIX_LEN); 19 20 *prefix = ifh_prefix; 21 memset(injection, 0, OCELOT_TAG_LEN); 22 ocelot_ifh_set_bypass(injection, 1); 23 ocelot_ifh_set_src(injection, ds->num_ports); 24 ocelot_ifh_set_qos_class(injection, skb->priority); 25 26 rew_op = ocelot_ptp_rew_op(skb); 27 if (rew_op) 28 ocelot_ifh_set_rew_op(injection, rew_op); 29 30 *ifh = injection; 31 } 32 33 static struct sk_buff *ocelot_xmit(struct sk_buff *skb, 34 struct net_device *netdev) 35 { 36 struct dsa_port *dp = dsa_slave_to_port(netdev); 37 void *injection; 38 39 ocelot_xmit_common(skb, netdev, cpu_to_be32(0x8880000a), &injection); 40 ocelot_ifh_set_dest(injection, BIT_ULL(dp->index)); 41 42 return skb; 43 } 44 45 static struct sk_buff *seville_xmit(struct sk_buff *skb, 46 struct net_device *netdev) 47 { 48 struct dsa_port *dp = dsa_slave_to_port(netdev); 49 void *injection; 50 51 ocelot_xmit_common(skb, netdev, cpu_to_be32(0x88800005), &injection); 52 seville_ifh_set_dest(injection, BIT_ULL(dp->index)); 53 54 return skb; 55 } 56 57 static struct sk_buff *ocelot_rcv(struct sk_buff *skb, 58 struct net_device *netdev, 59 struct packet_type *pt) 60 { 61 u64 src_port, qos_class; 62 u64 vlan_tci, tag_type; 63 u8 *start = skb->data; 64 struct dsa_port *dp; 65 u8 *extraction; 66 u16 vlan_tpid; 67 68 /* Revert skb->data by the amount consumed by the DSA master, 69 * so it points to the beginning of the frame. 70 */ 71 skb_push(skb, ETH_HLEN); 72 /* We don't care about the short prefix, it is just for easy entrance 73 * into the DSA master's RX filter. Discard it now by moving it into 74 * the headroom. 75 */ 76 skb_pull(skb, OCELOT_SHORT_PREFIX_LEN); 77 /* And skb->data now points to the extraction frame header. 78 * Keep a pointer to it. 79 */ 80 extraction = skb->data; 81 /* Now the EFH is part of the headroom as well */ 82 skb_pull(skb, OCELOT_TAG_LEN); 83 /* Reset the pointer to the real MAC header */ 84 skb_reset_mac_header(skb); 85 skb_reset_mac_len(skb); 86 /* And move skb->data to the correct location again */ 87 skb_pull(skb, ETH_HLEN); 88 89 /* Remove from inet csum the extraction header */ 90 skb_postpull_rcsum(skb, start, OCELOT_TOTAL_TAG_LEN); 91 92 ocelot_xfh_get_src_port(extraction, &src_port); 93 ocelot_xfh_get_qos_class(extraction, &qos_class); 94 ocelot_xfh_get_tag_type(extraction, &tag_type); 95 ocelot_xfh_get_vlan_tci(extraction, &vlan_tci); 96 97 skb->dev = dsa_master_find_slave(netdev, 0, src_port); 98 if (!skb->dev) 99 /* The switch will reflect back some frames sent through 100 * sockets opened on the bare DSA master. These will come back 101 * with src_port equal to the index of the CPU port, for which 102 * there is no slave registered. So don't print any error 103 * message here (ignore and drop those frames). 104 */ 105 return NULL; 106 107 skb->offload_fwd_mark = 1; 108 skb->priority = qos_class; 109 110 /* Ocelot switches copy frames unmodified to the CPU. However, it is 111 * possible for the user to request a VLAN modification through 112 * VCAP_IS1_ACT_VID_REPLACE_ENA. In this case, what will happen is that 113 * the VLAN ID field from the Extraction Header gets updated, but the 114 * 802.1Q header does not (the classified VLAN only becomes visible on 115 * egress through the "port tag" of front-panel ports). 116 * So, for traffic extracted by the CPU, we want to pick up the 117 * classified VLAN and manually replace the existing 802.1Q header from 118 * the packet with it, so that the operating system is always up to 119 * date with the result of tc-vlan actions. 120 * NOTE: In VLAN-unaware mode, we don't want to do that, we want the 121 * frame to remain unmodified, because the classified VLAN is always 122 * equal to the pvid of the ingress port and should not be used for 123 * processing. 124 */ 125 dp = dsa_slave_to_port(skb->dev); 126 vlan_tpid = tag_type ? ETH_P_8021AD : ETH_P_8021Q; 127 128 if (dsa_port_is_vlan_filtering(dp) && 129 eth_hdr(skb)->h_proto == htons(vlan_tpid)) { 130 u16 dummy_vlan_tci; 131 132 skb_push_rcsum(skb, ETH_HLEN); 133 __skb_vlan_pop(skb, &dummy_vlan_tci); 134 skb_pull_rcsum(skb, ETH_HLEN); 135 __vlan_hwaccel_put_tag(skb, htons(vlan_tpid), vlan_tci); 136 } 137 138 return skb; 139 } 140 141 static const struct dsa_device_ops ocelot_netdev_ops = { 142 .name = "ocelot", 143 .proto = DSA_TAG_PROTO_OCELOT, 144 .xmit = ocelot_xmit, 145 .rcv = ocelot_rcv, 146 .needed_headroom = OCELOT_TOTAL_TAG_LEN, 147 .promisc_on_master = true, 148 }; 149 150 DSA_TAG_DRIVER(ocelot_netdev_ops); 151 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_OCELOT); 152 153 static const struct dsa_device_ops seville_netdev_ops = { 154 .name = "seville", 155 .proto = DSA_TAG_PROTO_SEVILLE, 156 .xmit = seville_xmit, 157 .rcv = ocelot_rcv, 158 .needed_headroom = OCELOT_TOTAL_TAG_LEN, 159 .promisc_on_master = true, 160 }; 161 162 DSA_TAG_DRIVER(seville_netdev_ops); 163 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SEVILLE); 164 165 static struct dsa_tag_driver *ocelot_tag_driver_array[] = { 166 &DSA_TAG_DRIVER_NAME(ocelot_netdev_ops), 167 &DSA_TAG_DRIVER_NAME(seville_netdev_ops), 168 }; 169 170 module_dsa_tag_drivers(ocelot_tag_driver_array); 171 172 MODULE_LICENSE("GPL v2"); 173