| // SPDX-License-Identifier: GPL-2.0 |
| /* Copyright 2019 NXP |
| */ |
| #include <linux/dsa/ocelot.h> |
| #include "dsa_priv.h" |
| |
| /* If the port is under a VLAN-aware bridge, remove the VLAN header from the |
| * payload and move it into the DSA tag, which will make the switch classify |
| * the packet to the bridge VLAN. Otherwise, leave the classified VLAN at zero, |
| * which is the pvid of standalone and VLAN-unaware bridge ports. |
| */ |
| static void ocelot_xmit_get_vlan_info(struct sk_buff *skb, struct dsa_port *dp, |
| u64 *vlan_tci, u64 *tag_type) |
| { |
| struct net_device *br = READ_ONCE(dp->bridge_dev); |
| struct vlan_ethhdr *hdr; |
| u16 proto, tci; |
| |
| if (!br || !br_vlan_enabled(br)) { |
| *vlan_tci = 0; |
| *tag_type = IFH_TAG_TYPE_C; |
| return; |
| } |
| |
| hdr = (struct vlan_ethhdr *)skb_mac_header(skb); |
| br_vlan_get_proto(br, &proto); |
| |
| if (ntohs(hdr->h_vlan_proto) == proto) { |
| __skb_vlan_pop(skb, &tci); |
| *vlan_tci = tci; |
| } else { |
| rcu_read_lock(); |
| br_vlan_get_pvid_rcu(br, &tci); |
| rcu_read_unlock(); |
| *vlan_tci = tci; |
| } |
| |
| *tag_type = (proto != ETH_P_8021Q) ? IFH_TAG_TYPE_S : IFH_TAG_TYPE_C; |
| } |
| |
| static void ocelot_xmit_common(struct sk_buff *skb, struct net_device *netdev, |
| __be32 ifh_prefix, void **ifh) |
| { |
| struct dsa_port *dp = dsa_slave_to_port(netdev); |
| struct dsa_switch *ds = dp->ds; |
| u64 vlan_tci, tag_type; |
| void *injection; |
| __be32 *prefix; |
| u32 rew_op = 0; |
| |
| ocelot_xmit_get_vlan_info(skb, dp, &vlan_tci, &tag_type); |
| |
| injection = skb_push(skb, OCELOT_TAG_LEN); |
| prefix = skb_push(skb, OCELOT_SHORT_PREFIX_LEN); |
| |
| *prefix = ifh_prefix; |
| memset(injection, 0, OCELOT_TAG_LEN); |
| ocelot_ifh_set_bypass(injection, 1); |
| ocelot_ifh_set_src(injection, ds->num_ports); |
| ocelot_ifh_set_qos_class(injection, skb->priority); |
| ocelot_ifh_set_vlan_tci(injection, vlan_tci); |
| ocelot_ifh_set_tag_type(injection, tag_type); |
| |
| rew_op = ocelot_ptp_rew_op(skb); |
| if (rew_op) |
| ocelot_ifh_set_rew_op(injection, rew_op); |
| |
| *ifh = injection; |
| } |
| |
| static struct sk_buff *ocelot_xmit(struct sk_buff *skb, |
| struct net_device *netdev) |
| { |
| struct dsa_port *dp = dsa_slave_to_port(netdev); |
| void *injection; |
| |
| ocelot_xmit_common(skb, netdev, cpu_to_be32(0x8880000a), &injection); |
| ocelot_ifh_set_dest(injection, BIT_ULL(dp->index)); |
| |
| return skb; |
| } |
| |
| static struct sk_buff *seville_xmit(struct sk_buff *skb, |
| struct net_device *netdev) |
| { |
| struct dsa_port *dp = dsa_slave_to_port(netdev); |
| void *injection; |
| |
| ocelot_xmit_common(skb, netdev, cpu_to_be32(0x88800005), &injection); |
| seville_ifh_set_dest(injection, BIT_ULL(dp->index)); |
| |
| return skb; |
| } |
| |
| static struct sk_buff *ocelot_rcv(struct sk_buff *skb, |
| struct net_device *netdev) |
| { |
| u64 src_port, qos_class; |
| u64 vlan_tci, tag_type; |
| u8 *start = skb->data; |
| struct dsa_port *dp; |
| u8 *extraction; |
| u16 vlan_tpid; |
| u64 rew_val; |
| |
| /* Revert skb->data by the amount consumed by the DSA master, |
| * so it points to the beginning of the frame. |
| */ |
| skb_push(skb, ETH_HLEN); |
| /* We don't care about the short prefix, it is just for easy entrance |
| * into the DSA master's RX filter. Discard it now by moving it into |
| * the headroom. |
| */ |
| skb_pull(skb, OCELOT_SHORT_PREFIX_LEN); |
| /* And skb->data now points to the extraction frame header. |
| * Keep a pointer to it. |
| */ |
| extraction = skb->data; |
| /* Now the EFH is part of the headroom as well */ |
| skb_pull(skb, OCELOT_TAG_LEN); |
| /* Reset the pointer to the real MAC header */ |
| skb_reset_mac_header(skb); |
| skb_reset_mac_len(skb); |
| /* And move skb->data to the correct location again */ |
| skb_pull(skb, ETH_HLEN); |
| |
| /* Remove from inet csum the extraction header */ |
| skb_postpull_rcsum(skb, start, OCELOT_TOTAL_TAG_LEN); |
| |
| ocelot_xfh_get_src_port(extraction, &src_port); |
| ocelot_xfh_get_qos_class(extraction, &qos_class); |
| ocelot_xfh_get_tag_type(extraction, &tag_type); |
| ocelot_xfh_get_vlan_tci(extraction, &vlan_tci); |
| ocelot_xfh_get_rew_val(extraction, &rew_val); |
| |
| skb->dev = dsa_master_find_slave(netdev, 0, src_port); |
| if (!skb->dev) |
| /* The switch will reflect back some frames sent through |
| * sockets opened on the bare DSA master. These will come back |
| * with src_port equal to the index of the CPU port, for which |
| * there is no slave registered. So don't print any error |
| * message here (ignore and drop those frames). |
| */ |
| return NULL; |
| |
| dsa_default_offload_fwd_mark(skb); |
| skb->priority = qos_class; |
| OCELOT_SKB_CB(skb)->tstamp_lo = rew_val; |
| |
| /* Ocelot switches copy frames unmodified to the CPU. However, it is |
| * possible for the user to request a VLAN modification through |
| * VCAP_IS1_ACT_VID_REPLACE_ENA. In this case, what will happen is that |
| * the VLAN ID field from the Extraction Header gets updated, but the |
| * 802.1Q header does not (the classified VLAN only becomes visible on |
| * egress through the "port tag" of front-panel ports). |
| * So, for traffic extracted by the CPU, we want to pick up the |
| * classified VLAN and manually replace the existing 802.1Q header from |
| * the packet with it, so that the operating system is always up to |
| * date with the result of tc-vlan actions. |
| * NOTE: In VLAN-unaware mode, we don't want to do that, we want the |
| * frame to remain unmodified, because the classified VLAN is always |
| * equal to the pvid of the ingress port and should not be used for |
| * processing. |
| */ |
| dp = dsa_slave_to_port(skb->dev); |
| vlan_tpid = tag_type ? ETH_P_8021AD : ETH_P_8021Q; |
| |
| if (dsa_port_is_vlan_filtering(dp) && |
| eth_hdr(skb)->h_proto == htons(vlan_tpid)) { |
| u16 dummy_vlan_tci; |
| |
| skb_push_rcsum(skb, ETH_HLEN); |
| __skb_vlan_pop(skb, &dummy_vlan_tci); |
| skb_pull_rcsum(skb, ETH_HLEN); |
| __vlan_hwaccel_put_tag(skb, htons(vlan_tpid), vlan_tci); |
| } |
| |
| return skb; |
| } |
| |
| static const struct dsa_device_ops ocelot_netdev_ops = { |
| .name = "ocelot", |
| .proto = DSA_TAG_PROTO_OCELOT, |
| .xmit = ocelot_xmit, |
| .rcv = ocelot_rcv, |
| .needed_headroom = OCELOT_TOTAL_TAG_LEN, |
| .promisc_on_master = true, |
| }; |
| |
| DSA_TAG_DRIVER(ocelot_netdev_ops); |
| MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_OCELOT); |
| |
| static const struct dsa_device_ops seville_netdev_ops = { |
| .name = "seville", |
| .proto = DSA_TAG_PROTO_SEVILLE, |
| .xmit = seville_xmit, |
| .rcv = ocelot_rcv, |
| .needed_headroom = OCELOT_TOTAL_TAG_LEN, |
| .promisc_on_master = true, |
| }; |
| |
| DSA_TAG_DRIVER(seville_netdev_ops); |
| MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SEVILLE); |
| |
| static struct dsa_tag_driver *ocelot_tag_driver_array[] = { |
| &DSA_TAG_DRIVER_NAME(ocelot_netdev_ops), |
| &DSA_TAG_DRIVER_NAME(seville_netdev_ops), |
| }; |
| |
| module_dsa_tag_drivers(ocelot_tag_driver_array); |
| |
| MODULE_LICENSE("GPL v2"); |