From patchwork Tue Jan 10 08:49:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arun Ramadoss X-Patchwork-Id: 13094839 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D538EC678DB for ; Tue, 10 Jan 2023 08:52:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237903AbjAJIwF (ORCPT ); Tue, 10 Jan 2023 03:52:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40502 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230083AbjAJIvS (ORCPT ); Tue, 10 Jan 2023 03:51:18 -0500 Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.154.123]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DBF346462; Tue, 10 Jan 2023 00:51:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1673340675; x=1704876675; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=W9/ieWmq47NF0rjJtmmBrm2oXwt3dBYiWQXPnFzgM9U=; b=pqO8V9FnG5VUei9VRZdFxMDyDadIst2Umm8drRSGZiq+0MfReueeB7bz mW3gTogfZsCKwK0dN/Fk3K74zHgwOSaYJNxi9hVHHX2FLdNTulYnv4Pd3 HwKDDN9BQiNXKYPoYIc2Sl5YnM2VlHH5pZaBzEYAWenv7LcvB/qNxGai8 Bde4wM4AClqQVBb0o5OHN0xVTafnCz1DQf2+3rxPvT+CMME6QstbkIEkI RJmV88JIEEZtuMXYdGVXSwoztCcy3lRMfpZzeC1YQzxumlprFRDFw/R/r +s3AjbRPw3/9w6TNDaEuRyQ6Hx1MNoyjJyXTM3ZFp/A6Az/Id1ELBkpuZ w==; X-IronPort-AV: E=Sophos;i="5.96,314,1665471600"; d="scan'208";a="131614499" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa6.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 10 Jan 2023 01:51:15 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.85.144) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.16; Tue, 10 Jan 2023 01:51:14 -0700 Received: from CHE-LT-I17769U.microchip.com (10.10.115.15) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2507.16 via Frontend Transport; Tue, 10 Jan 2023 01:51:06 -0700 From: Arun Ramadoss To: , CC: , , , , , , , , , , , , , Subject: [Patch net-next v8 08/13] net: dsa: microchip: ptp: add packet transmission timestamping Date: Tue, 10 Jan 2023 14:19:25 +0530 Message-ID: <20230110084930.16049-9-arun.ramadoss@microchip.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20230110084930.16049-1-arun.ramadoss@microchip.com> References: <20230110084930.16049-1-arun.ramadoss@microchip.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Christian Eggers This patch adds the routines for transmission of ptp packets. When the ptp pdelay_req packet to be transmitted, it uses the deferred xmit worker to schedule the packets. During irq_setup, interrupt for Sync, Pdelay_req and Pdelay_rsp are enabled. So interrupt is triggered for all three packets. But for p2p1step, we require only time stamp of Pdelay_req packet. Hence to avoid posting of the completion from ISR routine for Sync and Pdelay_resp packets, ts_en flag is introduced. This controls which packets need to processed for timestamp. After the packet is transmitted, ISR is triggered. The time at which packet transmitted is recorded to separate register. This value is reconstructed to absolute time and posted to the user application through socket error queue. Signed-off-by: Christian Eggers Co-developed-by: Arun Ramadoss Signed-off-by: Arun Ramadoss Reviewed-by: Vladimir Oltean --- v6 -> v7 - Replaced 0/1 with false/true for ts_en - corrected the spaces in port_txtstamp() - Set SKB_TX_INPROGRESS flag before dsa_enqueue_skb() v1 -> v2 - Declared the deferred xmit and ksz_port_txtstamp function as null in ptp disabled case RFC v2 -> Patch v1 - separated the pdelay_rsp message correction update in different patch --- drivers/net/dsa/microchip/ksz_common.c | 14 +++ drivers/net/dsa/microchip/ksz_common.h | 3 + drivers/net/dsa/microchip/ksz_ptp.c | 115 ++++++++++++++++++++++++- drivers/net/dsa/microchip/ksz_ptp.h | 6 ++ include/linux/dsa/ksz_common.h | 8 ++ net/dsa/tag_ksz.c | 54 +++++++++++- 6 files changed, 196 insertions(+), 4 deletions(-) diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c index b4e7d579ac51..5e1e5bd555d2 100644 --- a/drivers/net/dsa/microchip/ksz_common.c +++ b/drivers/net/dsa/microchip/ksz_common.c @@ -6,6 +6,7 @@ */ #include +#include #include #include #include @@ -2539,6 +2540,17 @@ static enum dsa_tag_protocol ksz_get_tag_protocol(struct dsa_switch *ds, return proto; } +static int ksz_connect_tag_protocol(struct dsa_switch *ds, + enum dsa_tag_protocol proto) +{ + struct ksz_tagger_data *tagger_data; + + tagger_data = ksz_tagger_data(ds); + tagger_data->xmit_work_fn = ksz_port_deferred_xmit; + + return 0; +} + static int ksz_port_vlan_filtering(struct dsa_switch *ds, int port, bool flag, struct netlink_ext_ack *extack) { @@ -2954,6 +2966,7 @@ static int ksz_switch_detect(struct ksz_device *dev) static const struct dsa_switch_ops ksz_switch_ops = { .get_tag_protocol = ksz_get_tag_protocol, + .connect_tag_protocol = ksz_connect_tag_protocol, .get_phy_flags = ksz_get_phy_flags, .setup = ksz_setup, .teardown = ksz_teardown, @@ -2991,6 +3004,7 @@ static const struct dsa_switch_ops ksz_switch_ops = { .get_ts_info = ksz_get_ts_info, .port_hwtstamp_get = ksz_hwtstamp_get, .port_hwtstamp_set = ksz_hwtstamp_set, + .port_txtstamp = ksz_port_txtstamp, .port_rxtstamp = ksz_port_rxtstamp, }; diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h index ec1bceb4efcc..c8b49c86dfe1 100644 --- a/drivers/net/dsa/microchip/ksz_common.h +++ b/drivers/net/dsa/microchip/ksz_common.h @@ -87,6 +87,7 @@ struct ksz_irq { struct ksz_ptp_irq { struct ksz_port *port; u16 ts_reg; + bool ts_en; char name[16]; int num; }; @@ -116,6 +117,8 @@ struct ksz_port { bool hwts_rx_en; struct ksz_irq ptpirq; struct ksz_ptp_irq ptpmsg_irq[3]; + ktime_t tstamp_msg; + struct completion tstamp_msg_comp; #endif }; diff --git a/drivers/net/dsa/microchip/ksz_ptp.c b/drivers/net/dsa/microchip/ksz_ptp.c index 29413fb608ed..6edce141cbd7 100644 --- a/drivers/net/dsa/microchip/ksz_ptp.c +++ b/drivers/net/dsa/microchip/ksz_ptp.c @@ -18,6 +18,8 @@ #define ptp_caps_to_data(d) container_of((d), struct ksz_ptp_data, caps) #define ptp_data_to_ksz_dev(d) container_of((d), struct ksz_device, ptp_data) +#define work_to_xmit_work(w) \ + container_of((w), struct ksz_deferred_xmit_work, work) /* Sub-nanoseconds-adj,max * sub-nanoseconds / 40ns * 1ns * = (2^30-1) * (2 ^ 32) / 40 ns * 1 ns = 6249999 @@ -111,9 +113,15 @@ static int ksz_set_hwtstamp_config(struct ksz_device *dev, switch (config->tx_type) { case HWTSTAMP_TX_OFF: + prt->ptpmsg_irq[KSZ_SYNC_MSG].ts_en = false; + prt->ptpmsg_irq[KSZ_XDREQ_MSG].ts_en = false; + prt->ptpmsg_irq[KSZ_PDRES_MSG].ts_en = false; prt->hwts_tx_en = false; break; case HWTSTAMP_TX_ONESTEP_P2P: + prt->ptpmsg_irq[KSZ_SYNC_MSG].ts_en = false; + prt->ptpmsg_irq[KSZ_XDREQ_MSG].ts_en = true; + prt->ptpmsg_irq[KSZ_PDRES_MSG].ts_en = false; prt->hwts_tx_en = true; break; default: @@ -232,6 +240,87 @@ bool ksz_port_rxtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb, return false; } +void ksz_port_txtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb) +{ + struct ksz_device *dev = ds->priv; + struct ptp_header *hdr; + struct sk_buff *clone; + struct ksz_port *prt; + unsigned int type; + u8 ptp_msg_type; + + prt = &dev->ports[port]; + + if (!prt->hwts_tx_en) + return; + + type = ptp_classify_raw(skb); + if (type == PTP_CLASS_NONE) + return; + + hdr = ptp_parse_header(skb, type); + if (!hdr) + return; + + ptp_msg_type = ptp_get_msgtype(hdr, type); + + switch (ptp_msg_type) { + case PTP_MSGTYPE_PDELAY_REQ: + break; + + default: + return; + } + + clone = skb_clone_sk(skb); + if (!clone) + return; + + /* caching the value to be used in tag_ksz.c */ + KSZ_SKB_CB(skb)->clone = clone; +} + +static void ksz_ptp_txtstamp_skb(struct ksz_device *dev, + struct ksz_port *prt, struct sk_buff *skb) +{ + struct skb_shared_hwtstamps hwtstamps = {}; + int ret; + + /* timeout must include DSA master to transmit data, tstamp latency, + * IRQ latency and time for reading the time stamp. + */ + ret = wait_for_completion_timeout(&prt->tstamp_msg_comp, + msecs_to_jiffies(100)); + if (!ret) + return; + + hwtstamps.hwtstamp = prt->tstamp_msg; + skb_complete_tx_timestamp(skb, &hwtstamps); +} + +void ksz_port_deferred_xmit(struct kthread_work *work) +{ + struct ksz_deferred_xmit_work *xmit_work = work_to_xmit_work(work); + struct sk_buff *clone, *skb = xmit_work->skb; + struct dsa_switch *ds = xmit_work->dp->ds; + struct ksz_device *dev = ds->priv; + struct ksz_port *prt; + + prt = &dev->ports[xmit_work->dp->index]; + + clone = KSZ_SKB_CB(skb)->clone; + + skb_shinfo(clone)->tx_flags |= SKBTX_IN_PROGRESS; + + reinit_completion(&prt->tstamp_msg_comp); + + dsa_enqueue_skb(skb, skb->dev); + + ksz_ptp_txtstamp_skb(dev, prt, clone); + + kfree(xmit_work); +} + static int _ksz_ptp_gettime(struct ksz_device *dev, struct timespec64 *ts) { u32 nanoseconds; @@ -488,7 +577,29 @@ void ksz_ptp_clock_unregister(struct dsa_switch *ds) static irqreturn_t ksz_ptp_msg_thread_fn(int irq, void *dev_id) { - return IRQ_NONE; + struct ksz_ptp_irq *ptpmsg_irq = dev_id; + struct ksz_device *dev; + struct ksz_port *port; + u32 tstamp_raw; + ktime_t tstamp; + int ret; + + port = ptpmsg_irq->port; + dev = port->ksz_dev; + + if (ptpmsg_irq->ts_en) { + ret = ksz_read32(dev, ptpmsg_irq->ts_reg, &tstamp_raw); + if (ret) + return IRQ_NONE; + + tstamp = ksz_decode_tstamp(tstamp_raw); + + port->tstamp_msg = ksz_tstamp_reconstruct(dev, tstamp); + + complete(&port->tstamp_msg_comp); + } + + return IRQ_HANDLED; } static irqreturn_t ksz_ptp_irq_thread_fn(int irq, void *dev_id) @@ -633,6 +744,8 @@ int ksz_ptp_irq_setup(struct dsa_switch *ds, u8 p) REG_PTP_PORT_TX_INT_STATUS__2); snprintf(ptpirq->name, sizeof(ptpirq->name), "ptp-irq-%d", p); + init_completion(&port->tstamp_msg_comp); + ptpirq->domain = irq_domain_add_linear(dev->dev->of_node, ptpirq->nirqs, &ksz_ptp_irq_domain_ops, ptpirq); if (!ptpirq->domain) diff --git a/drivers/net/dsa/microchip/ksz_ptp.h b/drivers/net/dsa/microchip/ksz_ptp.h index 9bb8fb059ac2..0b14aed71ec2 100644 --- a/drivers/net/dsa/microchip/ksz_ptp.h +++ b/drivers/net/dsa/microchip/ksz_ptp.h @@ -30,6 +30,8 @@ int ksz_get_ts_info(struct dsa_switch *ds, int port, struct ethtool_ts_info *ts); int ksz_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr); int ksz_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr); +void ksz_port_txtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb); +void ksz_port_deferred_xmit(struct kthread_work *work); bool ksz_port_rxtstamp(struct dsa_switch *ds, int port, struct sk_buff *skb, unsigned int type); int ksz_ptp_irq_setup(struct dsa_switch *ds, u8 p); @@ -64,6 +66,10 @@ static inline void ksz_ptp_irq_free(struct dsa_switch *ds, u8 p) {} #define ksz_port_rxtstamp NULL +#define ksz_port_txtstamp NULL + +#define ksz_port_deferred_xmit NULL + #endif /* End of CONFIG_NET_DSA_MICROCHIP_KSZ_PTP */ #endif diff --git a/include/linux/dsa/ksz_common.h b/include/linux/dsa/ksz_common.h index a256b08d837d..b91beab5e138 100644 --- a/include/linux/dsa/ksz_common.h +++ b/include/linux/dsa/ksz_common.h @@ -23,11 +23,19 @@ static inline ktime_t ksz_decode_tstamp(u32 tstamp) return ns_to_ktime(ns); } +struct ksz_deferred_xmit_work { + struct dsa_port *dp; + struct sk_buff *skb; + struct kthread_work work; +}; + struct ksz_tagger_data { + void (*xmit_work_fn)(struct kthread_work *work); void (*hwtstamp_set_state)(struct dsa_switch *ds, bool on); }; struct ksz_skb_cb { + struct sk_buff *clone; u32 tstamp; }; diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c index 6603eaa234d2..e14ee26bf6a0 100644 --- a/net/dsa/tag_ksz.c +++ b/net/dsa/tag_ksz.c @@ -26,6 +26,7 @@ struct ksz_tagger_private { struct ksz_tagger_data data; /* Must be first */ unsigned long state; + struct kthread_worker *xmit_worker; }; static struct ksz_tagger_private * @@ -48,6 +49,7 @@ static void ksz_disconnect(struct dsa_switch *ds) { struct ksz_tagger_private *priv = ds->tagger_data; + kthread_destroy_worker(priv->xmit_worker); kfree(priv); ds->tagger_data = NULL; } @@ -55,12 +57,23 @@ static void ksz_disconnect(struct dsa_switch *ds) static int ksz_connect(struct dsa_switch *ds) { struct ksz_tagger_data *tagger_data; + struct kthread_worker *xmit_worker; struct ksz_tagger_private *priv; + int ret; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; + xmit_worker = kthread_create_worker(0, "dsa%d:%d_xmit", + ds->dst->index, ds->index); + if (IS_ERR(xmit_worker)) { + ret = PTR_ERR(xmit_worker); + kfree(priv); + return ret; + } + + priv->xmit_worker = xmit_worker; /* Export functions for switch driver use */ tagger_data = &priv->data; tagger_data->hwtstamp_set_state = ksz_hwtstamp_set_state; @@ -191,6 +204,41 @@ static void ksz_xmit_timestamp(struct dsa_port *dp, struct sk_buff *skb) put_unaligned_be32(0, skb_put(skb, KSZ_PTP_TAG_LEN)); } +/* Defer transmit if waiting for egress time stamp is required. */ +static struct sk_buff *ksz_defer_xmit(struct dsa_port *dp, struct sk_buff *skb) +{ + struct ksz_tagger_data *tagger_data = ksz_tagger_data(dp->ds); + struct ksz_tagger_private *priv = ksz_tagger_private(dp->ds); + void (*xmit_work_fn)(struct kthread_work *work); + struct sk_buff *clone = KSZ_SKB_CB(skb)->clone; + struct ksz_deferred_xmit_work *xmit_work; + struct kthread_worker *xmit_worker; + + if (!clone) + return skb; /* no deferred xmit for this packet */ + + xmit_work_fn = tagger_data->xmit_work_fn; + xmit_worker = priv->xmit_worker; + + if (!xmit_work_fn || !xmit_worker) + return NULL; + + xmit_work = kzalloc(sizeof(*xmit_work), GFP_ATOMIC); + if (!xmit_work) + return NULL; + + kthread_init_work(&xmit_work->work, xmit_work_fn); + /* Increase refcount so the kfree_skb in dsa_slave_xmit + * won't really free the packet. + */ + xmit_work->dp = dp; + xmit_work->skb = skb_get(skb); + + kthread_queue_work(xmit_worker, &xmit_work->work); + + return NULL; +} + static struct sk_buff *ksz9477_xmit(struct sk_buff *skb, struct net_device *dev) { @@ -215,7 +263,7 @@ static struct sk_buff *ksz9477_xmit(struct sk_buff *skb, *tag = cpu_to_be16(val); - return skb; + return ksz_defer_xmit(dp, skb); } static struct sk_buff *ksz9477_rcv(struct sk_buff *skb, struct net_device *dev) @@ -271,7 +319,7 @@ static struct sk_buff *ksz9893_xmit(struct sk_buff *skb, if (is_link_local_ether_addr(addr)) *tag |= KSZ9893_TAIL_TAG_OVERRIDE; - return skb; + return ksz_defer_xmit(dp, skb); } static const struct dsa_device_ops ksz9893_netdev_ops = { @@ -336,7 +384,7 @@ static struct sk_buff *lan937x_xmit(struct sk_buff *skb, put_unaligned_be16(val, tag); - return skb; + return ksz_defer_xmit(dp, skb); } static const struct dsa_device_ops lan937x_netdev_ops = {