diff options
Diffstat (limited to 'net/dsa/tag_ocelot.c')
-rw-r--r-- | net/dsa/tag_ocelot.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/net/dsa/tag_ocelot.c b/net/dsa/tag_ocelot.c new file mode 100644 index 000000000000..8e3e7283d430 --- /dev/null +++ b/net/dsa/tag_ocelot.c @@ -0,0 +1,241 @@ +// 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); + u64 bypass, dest, src, qos_class, rew_op; + struct dsa_switch *ds = dp->ds; + int port = dp->index; + struct ocelot *ocelot = ds->priv; + struct ocelot_port *ocelot_port = ocelot->ports[port]; + u8 *injection; + + if (unlikely(skb_cow_head(skb, OCELOT_TAG_LEN) < 0)) { + netdev_err(netdev, "Cannot make room for tag.\n"); + return NULL; + } + + injection = skb_push(skb, OCELOT_TAG_LEN); + + memset(injection, 0, OCELOT_TAG_LEN); + + src = dsa_upstream_port(ds, port); + dest = BIT(port); + bypass = true; + qos_class = skb->priority; + + packing(injection, &bypass, 127, 127, OCELOT_TAG_LEN, PACK, 0); + packing(injection, &dest, 68, 56, OCELOT_TAG_LEN, PACK, 0); + packing(injection, &src, 46, 43, OCELOT_TAG_LEN, PACK, 0); + packing(injection, &qos_class, 19, 17, OCELOT_TAG_LEN, PACK, 0); + + if (ocelot->ptp && (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) { + rew_op = ocelot_port->ptp_cmd; + if (ocelot_port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP) { + rew_op |= (ocelot_port->ts_id % 4) << 3; + ocelot_port->ts_id++; + } + + 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 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); |