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/*
* cxgb4_ptp.c:Chelsio PTP support for T5/T6
*
* Copyright (c) 2003-2017 Chelsio Communications, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Written by: Atul Gupta (atul.gupta@chelsio.com)
*/
#include <linux/module.h>
#include <linux/net_tstamp.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/pps_kernel.h>
#include <linux/ptp_clock_kernel.h>
#include <linux/ptp_classify.h>
#include <linux/udp.h>
#include "cxgb4.h"
#include "t4_hw.h"
#include "t4_regs.h"
#include "t4_msg.h"
#include "t4fw_api.h"
#include "cxgb4_ptp.h"
/**
* cxgb4_ptp_is_ptp_tx - determine whether TX packet is PTP or not
* @skb: skb of outgoing ptp request
*
*/
bool cxgb4_ptp_is_ptp_tx(struct sk_buff *skb)
{
struct udphdr *uh;
uh = udp_hdr(skb);
return skb->len >= PTP_MIN_LENGTH &&
skb->len <= PTP_IN_TRANSMIT_PACKET_MAXNUM &&
likely(skb->protocol == htons(ETH_P_IP)) &&
ip_hdr(skb)->protocol == IPPROTO_UDP &&
uh->dest == htons(PTP_EVENT_PORT);
}
bool is_ptp_enabled(struct sk_buff *skb, struct net_device *dev)
{
struct port_info *pi;
pi = netdev_priv(dev);
return (pi->ptp_enable && cxgb4_xmit_with_hwtstamp(skb) &&
cxgb4_ptp_is_ptp_tx(skb));
}
/**
* cxgb4_ptp_is_ptp_rx - determine whether RX packet is PTP or not
* @skb: skb of incoming ptp request
*
*/
bool cxgb4_ptp_is_ptp_rx(struct sk_buff *skb)
{
struct udphdr *uh = (struct udphdr *)(skb->data + ETH_HLEN +
IPV4_HLEN(skb->data));
return uh->dest == htons(PTP_EVENT_PORT) &&
uh->source == htons(PTP_EVENT_PORT);
}
/**
* cxgb4_ptp_read_hwstamp - read timestamp for TX event PTP message
* @adapter: board private structure
* @pi: port private structure
*
*/
void cxgb4_ptp_read_hwstamp(struct adapter *adapter, struct port_info *pi)
{
struct skb_shared_hwtstamps *skb_ts = NULL;
u64 tx_ts;
skb_ts = skb_hwtstamps(adapter->ptp_tx_skb);
tx_ts = t4_read_reg(adapter,
T5_PORT_REG(pi->port_id, MAC_PORT_TX_TS_VAL_LO));
tx_ts |= (u64)t4_read_reg(adapter,
T5_PORT_REG(pi->port_id,
MAC_PORT_TX_TS_VAL_HI)) << 32;
skb_ts->hwtstamp = ns_to_ktime(tx_ts);
skb_tstamp_tx(adapter->ptp_tx_skb, skb_ts);
dev_kfree_skb_any(adapter->ptp_tx_skb);
spin_lock(&adapter->ptp_lock);
adapter->ptp_tx_skb = NULL;
spin_unlock(&adapter->ptp_lock);
}
/**
* cxgb4_ptprx_timestamping - Enable Timestamp for RX PTP event message
* @pi: port private structure
* @port: pot number
* @mode: RX mode
*
*/
int cxgb4_ptprx_timestamping(struct port_info *pi, u8 port, u16 mode)
{
struct adapter *adapter = pi->adapter;
struct fw_ptp_cmd c;
int err;
memset(&c, 0, sizeof(c));
c.op_to_portid = cpu_to_be32(FW_CMD_OP_V(FW_PTP_CMD) |
FW_CMD_REQUEST_F |
FW_CMD_WRITE_F |
FW_PTP_CMD_PORTID_V(port));
c.retval_len16 = cpu_to_be32(FW_CMD_LEN16_V(sizeof(c) / 16));
c.u.init.sc = FW_PTP_SC_RXTIME_STAMP;
c.u.init.mode = cpu_to_be16(mode);
err = t4_wr_mbox(adapter, adapter->mbox, &c, sizeof(c), NULL);
if (err < 0)
dev_err(adapter->pdev_dev,
"PTP: %s error %d\n", __func__, -err);
return err;
}
int cxgb4_ptp_txtype(struct adapter *adapter, u8 port)
{
struct fw_ptp_cmd c;
int err;
memset(&c, 0, sizeof(c));
c.op_to_portid = cpu_to_be32(FW_CMD_OP_V(FW_PTP_CMD) |
FW_CMD_REQUEST_F |
FW_CMD_WRITE_F |
FW_PTP_CMD_PORTID_V(port));
c.retval_len16 = cpu_to_be32(FW_CMD_LEN16_V(sizeof(c) / 16));
c.u.init.sc = FW_PTP_SC_TX_TYPE;
c.u.init.mode = cpu_to_be16(PTP_TS_NONE);
err = t4_wr_mbox(adapter, adapter->mbox, &c, sizeof(c), NULL);
if (err < 0)
dev_err(adapter->pdev_dev,
"PTP: %s error %d\n", __func__, -err);
return err;
}
int cxgb4_ptp_redirect_rx_packet(struct adapter *adapter, struct port_info *pi)
{
struct sge *s = &adapter->sge;
struct sge_eth_rxq *receive_q = &s->ethrxq[pi->first_qset];
struct fw_ptp_cmd c;
int err;
memset(&c, 0, sizeof(c));
c.op_to_portid = cpu_to_be32(FW_CMD_OP_V(FW_PTP_CMD) |
FW_CMD_REQUEST_F |
FW_CMD_WRITE_F |
FW_PTP_CMD_PORTID_V(pi->port_id));
c.retval_len16 = cpu_to_be32(FW_CMD_LEN16_V(sizeof(c) / 16));
c.u.init.sc = FW_PTP_SC_RDRX_TYPE;
c.u.init.txchan = pi->tx_chan;
c.u.init.absid = cpu_to_be16(receive_q->rspq.abs_id);
err = t4_wr_mbox(adapter, adapter->mbox, &c, sizeof(c), NULL);
if (err < 0)
dev_err(adapter->pdev_dev,
"PTP: %s error %d\n", __func__, -err);
return err;
}
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