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Wed, 5 Feb 2025 17:54:32 +0530 (IST) Received: from zimbra.couthit.local (zimbra.couthit.local [10.10.10.103]) by zimbra.couthit.local (Postfix) with ESMTP id 003331783F46; Wed, 5 Feb 2025 17:54:31 +0530 (IST) Date: Wed, 5 Feb 2025 17:54:31 +0530 (IST) From: Basharath Hussain Khaja To: horms Cc: basharath , danishanwar , rogerq , andrew+netdev , davem , edumazet , kuba , pabeni , Rob Herring , krzk+dt , conor+dt , nm , ssantosh , tony , richardcochran , parvathi , schnelle , rdunlap , diogo ivo , m-karicheri2 , jacob e keller , m-malladi , javier carrasco cruz , afd , s-anna , linux-arm-kernel , netdev , devicetree , linux-kernel , linux-omap , pratheesh , prajith , vigneshr , praneeth , srk , rogerq , krishna , pmohan , mohan Message-ID: <1980208448.516541.1738758271732.JavaMail.zimbra@couthit.local> In-Reply-To: <20250131103352.GH24105@kernel.org> References: <20250124122353.1457174-1-basharath@couthit.com> <20250124134056.1459060-7-basharath@couthit.com> <20250131103352.GH24105@kernel.org> Subject: Re: [RFC v2 PATCH 06/10] net: ti: prueth: Adds HW timestamping support for PTP using PRU-ICSS IEP module Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Mailer: Zimbra 8.8.15_GA_3968 (ZimbraWebClient - FF113 (Linux)/8.8.15_GA_3968) Thread-Topic: prueth: Adds HW timestamping support for PTP using PRU-ICSS IEP module Thread-Index: hqQUi4g5G9OQqwwgSSWJWploNUaQCQ== X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.wki.vra.mybluehostin.me X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - couthit.com X-Get-Message-Sender-Via: server.wki.vra.mybluehostin.me: authenticated_id: smtp@couthit.com X-Authenticated-Sender: server.wki.vra.mybluehostin.me: smtp@couthit.com X-Source: X-Source-Args: X-Source-Dir: > On Fri, Jan 24, 2025 at 07:10:52PM +0530, Basharath Hussain Khaja wrote: >> From: Roger Quadros >> >> PRU-ICSS IEP module, which is capable of timestamping RX and >> TX packets at HW level, is used for time synchronization by PTP4L. >> >> This change includes interaction between firmware and user space >> application (ptp4l) with required packet timestamps. The driver >> initializes the PRU firmware with appropriate mode and configuration >> flags. Firmware updates local registers with the flags set by driver >> and uses for further operation. RX SOF timestamp comes along with >> packet and firmware will rise interrupt with TX SOF timestamp after >> pushing the packet on to the wire. >> >> IEP driver is available in upstream and we are reusing for hardware >> configuration for ICSSM as well. On top of that we have extended it >> with the changes for AM57xx SoC. >> >> Extended ethtool for reading HW timestamping capability of the PRU >> interfaces. >> >> Currently ordinary clock (OC) configuration has been validated with >> Linux ptp4l. >> >> Signed-off-by: Roger Quadros >> Signed-off-by: Andrew F. Davis >> Signed-off-by: Parvathi Pudi >> Signed-off-by: Basharath Hussain Khaja > > ... > >> diff --git a/drivers/net/ethernet/ti/icssm/icssm_prueth.c >> b/drivers/net/ethernet/ti/icssm/icssm_prueth.c > > ... > >> @@ -682,9 +899,22 @@ int icssm_emac_rx_packet(struct prueth_emac *emac, u16 >> *bd_rd_ptr, >> src_addr += actual_pkt_len; >> } >> >> + if (pkt_info->timestamp) { >> + src_addr = (void *)roundup((uintptr_t)src_addr, >> + ICSS_BLOCK_SIZE); > > Can PTR_ALIGN() be used here? > We are making sure Both roundup() and PTR_ALIGN() will point to the same address location. We will change this in the next version. >> + dst_addr = &ts; >> + memcpy(dst_addr, src_addr, sizeof(ts)); >> + } >> + >> if (!pkt_info->sv_frame) { >> skb_put(skb, actual_pkt_len); >> >> + if (icssm_prueth_ptp_rx_ts_is_enabled(emac) && >> + pkt_info->timestamp) { >> + ssh = skb_hwtstamps(skb); >> + memset(ssh, 0, sizeof(*ssh)); >> + ssh->hwtstamp = ns_to_ktime(ts); >> + } >> /* send packet up the stack */ >> skb->protocol = eth_type_trans(skb, ndev); >> local_bh_disable(); > > The code preceding the hunk below is: > > static int icssm_emac_request_irqs(struct prueth_emac *emac) > { > struct net_device *ndev = emac->ndev; > int ret; > > ret = request_threaded_irq(emac->rx_irq, NULL, icssm_emac_rx_thread, > IRQF_TRIGGER_HIGH | IRQF_ONESHOT, > ndev->name, ndev); > if (ret) { > netdev_err(ndev, "unable to request RX IRQ\n"); > return ret; > } > >> @@ -855,9 +1085,64 @@ static int icssm_emac_request_irqs(struct prueth_emac >> *emac) >> return ret; >> } >> >> + if (emac->emac_ptp_tx_irq) { >> + ret = request_threaded_irq(emac->emac_ptp_tx_irq, >> + icssm_prueth_ptp_tx_irq_handle, >> + icssm_prueth_ptp_tx_irq_work, >> + IRQF_TRIGGER_HIGH | IRQF_ONESHOT, >> + ndev->name, ndev); >> + if (ret) { >> + netdev_err(ndev, "unable to request PTP TX IRQ\n"); >> + free_irq(emac->rx_irq, ndev); >> + free_irq(emac->tx_irq, ndev); > > This seems somewhat asymmetric. This function does request emac->rx_irq > but not emac->tx_irq. So I don't think it is appropriate to free emac->tx_irq > here. > > Also, I would suggest using a goto label for unwind here. > Sure. We will clean this in the next version. >> + } >> + } >> + >> return ret; >> } >> > > ... Thanks & Best Regards, Basharath