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cxgb4: time stamping interface for PTP
Supports hardware and software time stamping via the Linux SO_TIMESTAMPING socket option. Cc: Richard Cochran <richardcochran@gmail.com> Signed-off-by: Atul Gupta <atul.gupta@chelsio.com> Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,194 @@ | ||
| /* | ||
| * 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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