| // SPDX-License-Identifier: GPL-2.0 |
| /* Copyright 2019 NXP Semiconductors |
| */ |
| #include <soc/mscc/ocelot.h> |
| #include <linux/packing.h> |
| #include "dsa_priv.h" |
| |
| /* The CPU injection header and the CPU extraction header can have 3 types of |
| * prefixes: long, short and no prefix. The format of the header itself is the |
| * same in all 3 cases. |
| * |
| * Extraction with long prefix: |
| * |
| * +-------------------+-------------------+------+------+------------+-------+ |
| * | ff:ff:ff:ff:ff:ff | ff:ff:ff:ff:ff:ff | 8880 | 000a | extraction | frame | |
| * | | | | | header | | |
| * +-------------------+-------------------+------+------+------------+-------+ |
| * 48 bits 48 bits 16 bits 16 bits 128 bits |
| * |
| * Extraction with short prefix: |
| * |
| * +------+------+------------+-------+ |
| * | 8880 | 000a | extraction | frame | |
| * | | | header | | |
| * +------+------+------------+-------+ |
| * 16 bits 16 bits 128 bits |
| * |
| * Extraction with no prefix: |
| * |
| * +------------+-------+ |
| * | extraction | frame | |
| * | header | | |
| * +------------+-------+ |
| * 128 bits |
| * |
| * |
| * Injection with long prefix: |
| * |
| * +-------------------+-------------------+------+------+------------+-------+ |
| * | any dmac | any smac | 8880 | 000a | injection | frame | |
| * | | | | | header | | |
| * +-------------------+-------------------+------+------+------------+-------+ |
| * 48 bits 48 bits 16 bits 16 bits 128 bits |
| * |
| * Injection with short prefix: |
| * |
| * +------+------+------------+-------+ |
| * | 8880 | 000a | injection | frame | |
| * | | | header | | |
| * +------+------+------------+-------+ |
| * 16 bits 16 bits 128 bits |
| * |
| * Injection with no prefix: |
| * |
| * +------------+-------+ |
| * | injection | frame | |
| * | header | | |
| * +------------+-------+ |
| * 128 bits |
| * |
| * The injection header looks like this (network byte order, bit 127 |
| * is part of lowest address byte in memory, bit 0 is part of highest |
| * address byte): |
| * |
| * +------+------+------+------+------+------+------+------+ |
| * 127:120 |BYPASS| MASQ | MASQ_PORT |REW_OP|REW_OP| |
| * +------+------+------+------+------+------+------+------+ |
| * 119:112 | REW_OP | |
| * +------+------+------+------+------+------+------+------+ |
| * 111:104 | REW_VAL | |
| * +------+------+------+------+------+------+------+------+ |
| * 103: 96 | REW_VAL | |
| * +------+------+------+------+------+------+------+------+ |
| * 95: 88 | REW_VAL | |
| * +------+------+------+------+------+------+------+------+ |
| * 87: 80 | REW_VAL | |
| * +------+------+------+------+------+------+------+------+ |
| * 79: 72 | RSV | |
| * +------+------+------+------+------+------+------+------+ |
| * 71: 64 | RSV | DEST | |
| * +------+------+------+------+------+------+------+------+ |
| * 63: 56 | DEST | |
| * +------+------+------+------+------+------+------+------+ |
| * 55: 48 | RSV | |
| * +------+------+------+------+------+------+------+------+ |
| * 47: 40 | RSV | SRC_PORT | RSV |TFRM_TIMER| |
| * +------+------+------+------+------+------+------+------+ |
| * 39: 32 | TFRM_TIMER | RSV | |
| * +------+------+------+------+------+------+------+------+ |
| * 31: 24 | RSV | DP | POP_CNT | CPUQ | |
| * +------+------+------+------+------+------+------+------+ |
| * 23: 16 | CPUQ | QOS_CLASS |TAG_TYPE| |
| * +------+------+------+------+------+------+------+------+ |
| * 15: 8 | PCP | DEI | VID | |
| * +------+------+------+------+------+------+------+------+ |
| * 7: 0 | VID | |
| * +------+------+------+------+------+------+------+------+ |
| * |
| * And the extraction header looks like this: |
| * |
| * +------+------+------+------+------+------+------+------+ |
| * 127:120 | RSV | REW_OP | |
| * +------+------+------+------+------+------+------+------+ |
| * 119:112 | REW_OP | REW_VAL | |
| * +------+------+------+------+------+------+------+------+ |
| * 111:104 | REW_VAL | |
| * +------+------+------+------+------+------+------+------+ |
| * 103: 96 | REW_VAL | |
| * +------+------+------+------+------+------+------+------+ |
| * 95: 88 | REW_VAL | |
| * +------+------+------+------+------+------+------+------+ |
| * 87: 80 | REW_VAL | LLEN | |
| * +------+------+------+------+------+------+------+------+ |
| * 79: 72 | LLEN | WLEN | |
| * +------+------+------+------+------+------+------+------+ |
| * 71: 64 | WLEN | RSV | |
| * +------+------+------+------+------+------+------+------+ |
| * 63: 56 | RSV | |
| * +------+------+------+------+------+------+------+------+ |
| * 55: 48 | RSV | |
| * +------+------+------+------+------+------+------+------+ |
| * 47: 40 | RSV | SRC_PORT | ACL_ID | |
| * +------+------+------+------+------+------+------+------+ |
| * 39: 32 | ACL_ID | RSV | SFLOW_ID | |
| * +------+------+------+------+------+------+------+------+ |
| * 31: 24 |ACL_HIT| DP | LRN_FLAGS | CPUQ | |
| * +------+------+------+------+------+------+------+------+ |
| * 23: 16 | CPUQ | QOS_CLASS |TAG_TYPE| |
| * +------+------+------+------+------+------+------+------+ |
| * 15: 8 | PCP | DEI | VID | |
| * +------+------+------+------+------+------+------+------+ |
| * 7: 0 | VID | |
| * +------+------+------+------+------+------+------+------+ |
| */ |
| |
| static struct sk_buff *ocelot_xmit(struct sk_buff *skb, |
| struct net_device *netdev) |
| { |
| struct dsa_port *dp = dsa_slave_to_port(netdev); |
| struct dsa_switch *ds = dp->ds; |
| struct ocelot *ocelot = ds->priv; |
| struct ocelot_port *ocelot_port; |
| u64 qos_class, rew_op; |
| u8 *injection; |
| |
| if (unlikely(skb_cow_head(skb, OCELOT_TAG_LEN) < 0)) { |
| netdev_err(netdev, "Cannot make room for tag.\n"); |
| return NULL; |
| } |
| |
| ocelot_port = ocelot->ports[dp->index]; |
| |
| injection = skb_push(skb, OCELOT_TAG_LEN); |
| |
| memcpy(injection, ocelot_port->xmit_template, OCELOT_TAG_LEN); |
| /* Fix up the fields which are not statically determined |
| * in the template |
| */ |
| qos_class = skb->priority; |
| packing(injection, &qos_class, 19, 17, OCELOT_TAG_LEN, PACK, 0); |
| |
| if (ocelot->ptp && (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) { |
| struct sk_buff *clone = DSA_SKB_CB(skb)->clone; |
| |
| rew_op = ocelot_port->ptp_cmd; |
| /* Retrieve timestamp ID populated inside skb->cb[0] of the |
| * clone by ocelot_port_add_txtstamp_skb |
| */ |
| if (ocelot_port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP) |
| rew_op |= clone->cb[0] << 3; |
| |
| packing(injection, &rew_op, 125, 117, OCELOT_TAG_LEN, PACK, 0); |
| } |
| |
| return skb; |
| } |
| |
| static struct sk_buff *ocelot_rcv(struct sk_buff *skb, |
| struct net_device *netdev, |
| struct packet_type *pt) |
| { |
| u64 src_port, qos_class; |
| u8 *start = skb->data; |
| u8 *extraction; |
| |
| /* 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 long 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_LONG_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_LONG_PREFIX_LEN + OCELOT_TAG_LEN); |
| |
| packing(extraction, &src_port, 46, 43, OCELOT_TAG_LEN, UNPACK, 0); |
| packing(extraction, &qos_class, 19, 17, OCELOT_TAG_LEN, UNPACK, 0); |
| |
| 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; |
| |
| skb->offload_fwd_mark = 1; |
| skb->priority = qos_class; |
| |
| return skb; |
| } |
| |
| static const struct dsa_device_ops ocelot_netdev_ops = { |
| .name = "ocelot", |
| .proto = DSA_TAG_PROTO_OCELOT, |
| .xmit = ocelot_xmit, |
| .rcv = ocelot_rcv, |
| .overhead = OCELOT_TAG_LEN + OCELOT_LONG_PREFIX_LEN, |
| }; |
| |
| MODULE_LICENSE("GPL v2"); |
| MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_OCELOT); |
| |
| module_dsa_tag_driver(ocelot_netdev_ops); |
