c0bcf53766
This patch is to reuse ocelot functions as possible to enable PTP clock and to support hardware timestamping on Felix. On TX path, timestamping works on packet which requires timestamp. The injection header will be configured accordingly, and skb clone requires timestamp will be added into a list. The TX timestamp is final handled in threaded interrupt handler when PTP timestamp FIFO is ready. On RX path, timestamping is always working. The RX timestamp could be got from extraction header. Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
242 lines
11 KiB
C
242 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright 2019 NXP Semiconductors
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*/
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#include <soc/mscc/ocelot.h>
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#include <linux/packing.h>
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#include "dsa_priv.h"
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/* The CPU injection header and the CPU extraction header can have 3 types of
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* prefixes: long, short and no prefix. The format of the header itself is the
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* same in all 3 cases.
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*
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* Extraction with long prefix:
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*
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* +-------------------+-------------------+------+------+------------+-------+
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* | ff:ff:ff:ff:ff:ff | ff:ff:ff:ff:ff:ff | 8880 | 000a | extraction | frame |
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* | | | | | header | |
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* +-------------------+-------------------+------+------+------------+-------+
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* 48 bits 48 bits 16 bits 16 bits 128 bits
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*
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* Extraction with short prefix:
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*
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* +------+------+------------+-------+
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* | 8880 | 000a | extraction | frame |
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* | | | header | |
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* +------+------+------------+-------+
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* 16 bits 16 bits 128 bits
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*
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* Extraction with no prefix:
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*
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* +------------+-------+
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* | extraction | frame |
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* | header | |
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* +------------+-------+
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* 128 bits
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*
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*
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* Injection with long prefix:
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*
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* +-------------------+-------------------+------+------+------------+-------+
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* | any dmac | any smac | 8880 | 000a | injection | frame |
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* | | | | | header | |
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* +-------------------+-------------------+------+------+------------+-------+
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* 48 bits 48 bits 16 bits 16 bits 128 bits
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*
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* Injection with short prefix:
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*
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* +------+------+------------+-------+
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* | 8880 | 000a | injection | frame |
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* | | | header | |
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* +------+------+------------+-------+
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* 16 bits 16 bits 128 bits
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*
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* Injection with no prefix:
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*
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* +------------+-------+
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* | injection | frame |
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* | header | |
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* +------------+-------+
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* 128 bits
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*
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* The injection header looks like this (network byte order, bit 127
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* is part of lowest address byte in memory, bit 0 is part of highest
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* address byte):
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*
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* +------+------+------+------+------+------+------+------+
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* 127:120 |BYPASS| MASQ | MASQ_PORT |REW_OP|REW_OP|
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* +------+------+------+------+------+------+------+------+
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* 119:112 | REW_OP |
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* +------+------+------+------+------+------+------+------+
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* 111:104 | REW_VAL |
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* +------+------+------+------+------+------+------+------+
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* 103: 96 | REW_VAL |
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* +------+------+------+------+------+------+------+------+
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* 95: 88 | REW_VAL |
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* +------+------+------+------+------+------+------+------+
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* 87: 80 | REW_VAL |
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* +------+------+------+------+------+------+------+------+
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* 79: 72 | RSV |
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* +------+------+------+------+------+------+------+------+
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* 71: 64 | RSV | DEST |
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* +------+------+------+------+------+------+------+------+
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* 63: 56 | DEST |
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* +------+------+------+------+------+------+------+------+
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* 55: 48 | RSV |
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* +------+------+------+------+------+------+------+------+
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* 47: 40 | RSV | SRC_PORT | RSV |TFRM_TIMER|
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* +------+------+------+------+------+------+------+------+
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* 39: 32 | TFRM_TIMER | RSV |
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* +------+------+------+------+------+------+------+------+
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* 31: 24 | RSV | DP | POP_CNT | CPUQ |
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* +------+------+------+------+------+------+------+------+
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* 23: 16 | CPUQ | QOS_CLASS |TAG_TYPE|
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* +------+------+------+------+------+------+------+------+
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* 15: 8 | PCP | DEI | VID |
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* +------+------+------+------+------+------+------+------+
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* 7: 0 | VID |
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* +------+------+------+------+------+------+------+------+
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*
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* And the extraction header looks like this:
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*
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* +------+------+------+------+------+------+------+------+
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* 127:120 | RSV | REW_OP |
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* +------+------+------+------+------+------+------+------+
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* 119:112 | REW_OP | REW_VAL |
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* +------+------+------+------+------+------+------+------+
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* 111:104 | REW_VAL |
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* +------+------+------+------+------+------+------+------+
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* 103: 96 | REW_VAL |
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* +------+------+------+------+------+------+------+------+
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* 95: 88 | REW_VAL |
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* +------+------+------+------+------+------+------+------+
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* 87: 80 | REW_VAL | LLEN |
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* +------+------+------+------+------+------+------+------+
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* 79: 72 | LLEN | WLEN |
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* +------+------+------+------+------+------+------+------+
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* 71: 64 | WLEN | RSV |
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* +------+------+------+------+------+------+------+------+
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* 63: 56 | RSV |
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* +------+------+------+------+------+------+------+------+
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* 55: 48 | RSV |
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* +------+------+------+------+------+------+------+------+
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* 47: 40 | RSV | SRC_PORT | ACL_ID |
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* +------+------+------+------+------+------+------+------+
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* 39: 32 | ACL_ID | RSV | SFLOW_ID |
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* +------+------+------+------+------+------+------+------+
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* 31: 24 |ACL_HIT| DP | LRN_FLAGS | CPUQ |
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* +------+------+------+------+------+------+------+------+
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* 23: 16 | CPUQ | QOS_CLASS |TAG_TYPE|
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* +------+------+------+------+------+------+------+------+
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* 15: 8 | PCP | DEI | VID |
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* +------+------+------+------+------+------+------+------+
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* 7: 0 | VID |
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* +------+------+------+------+------+------+------+------+
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*/
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static struct sk_buff *ocelot_xmit(struct sk_buff *skb,
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struct net_device *netdev)
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{
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struct dsa_port *dp = dsa_slave_to_port(netdev);
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u64 bypass, dest, src, qos_class, rew_op;
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struct dsa_switch *ds = dp->ds;
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int port = dp->index;
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struct ocelot *ocelot = ds->priv;
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struct ocelot_port *ocelot_port = ocelot->ports[port];
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u8 *injection;
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if (unlikely(skb_cow_head(skb, OCELOT_TAG_LEN) < 0)) {
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netdev_err(netdev, "Cannot make room for tag.\n");
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return NULL;
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}
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injection = skb_push(skb, OCELOT_TAG_LEN);
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memset(injection, 0, OCELOT_TAG_LEN);
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src = dsa_upstream_port(ds, port);
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dest = BIT(port);
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bypass = true;
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qos_class = skb->priority;
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packing(injection, &bypass, 127, 127, OCELOT_TAG_LEN, PACK, 0);
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packing(injection, &dest, 68, 56, OCELOT_TAG_LEN, PACK, 0);
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packing(injection, &src, 46, 43, OCELOT_TAG_LEN, PACK, 0);
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packing(injection, &qos_class, 19, 17, OCELOT_TAG_LEN, PACK, 0);
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if (ocelot->ptp && (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) {
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rew_op = ocelot_port->ptp_cmd;
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if (ocelot_port->ptp_cmd == IFH_REW_OP_TWO_STEP_PTP) {
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rew_op |= (ocelot_port->ts_id % 4) << 3;
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ocelot_port->ts_id++;
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}
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packing(injection, &rew_op, 125, 117, OCELOT_TAG_LEN, PACK, 0);
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}
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return skb;
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}
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static struct sk_buff *ocelot_rcv(struct sk_buff *skb,
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struct net_device *netdev,
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struct packet_type *pt)
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{
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u64 src_port, qos_class;
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u8 *start = skb->data;
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u8 *extraction;
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/* Revert skb->data by the amount consumed by the DSA master,
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* so it points to the beginning of the frame.
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*/
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skb_push(skb, ETH_HLEN);
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/* We don't care about the long prefix, it is just for easy entrance
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* into the DSA master's RX filter. Discard it now by moving it into
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* the headroom.
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*/
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skb_pull(skb, OCELOT_LONG_PREFIX_LEN);
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/* And skb->data now points to the extraction frame header.
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* Keep a pointer to it.
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*/
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extraction = skb->data;
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/* Now the EFH is part of the headroom as well */
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skb_pull(skb, OCELOT_TAG_LEN);
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/* Reset the pointer to the real MAC header */
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skb_reset_mac_header(skb);
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skb_reset_mac_len(skb);
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/* And move skb->data to the correct location again */
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skb_pull(skb, ETH_HLEN);
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/* Remove from inet csum the extraction header */
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skb_postpull_rcsum(skb, start, OCELOT_LONG_PREFIX_LEN + OCELOT_TAG_LEN);
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packing(extraction, &src_port, 46, 43, OCELOT_TAG_LEN, UNPACK, 0);
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packing(extraction, &qos_class, 19, 17, OCELOT_TAG_LEN, UNPACK, 0);
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skb->dev = dsa_master_find_slave(netdev, 0, src_port);
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if (!skb->dev)
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/* The switch will reflect back some frames sent through
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* sockets opened on the bare DSA master. These will come back
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* with src_port equal to the index of the CPU port, for which
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* there is no slave registered. So don't print any error
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* message here (ignore and drop those frames).
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*/
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return NULL;
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skb->offload_fwd_mark = 1;
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skb->priority = qos_class;
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return skb;
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}
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static struct dsa_device_ops ocelot_netdev_ops = {
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.name = "ocelot",
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.proto = DSA_TAG_PROTO_OCELOT,
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.xmit = ocelot_xmit,
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.rcv = ocelot_rcv,
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.overhead = OCELOT_TAG_LEN + OCELOT_LONG_PREFIX_LEN,
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};
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_OCELOT);
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module_dsa_tag_driver(ocelot_netdev_ops);
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