From mboxrd@z Thu Jan 1 00:00:00 1970 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 84809C433FE for ; Mon, 7 Nov 2022 00:17:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230243AbiKGAQ4 (ORCPT ); Sun, 6 Nov 2022 19:16:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52692 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229756AbiKGAQx (ORCPT ); Sun, 6 Nov 2022 19:16:53 -0500 Received: from mail-qv1-xf34.google.com (mail-qv1-xf34.google.com [IPv6:2607:f8b0:4864:20::f34]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 39C39634D for ; Sun, 6 Nov 2022 16:16:52 -0800 (PST) Received: by mail-qv1-xf34.google.com with SMTP id j6so7132755qvn.12 for ; Sun, 06 Nov 2022 16:16:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date:message-id:reply-to; bh=bevCrzZXqcPKAC/Hy4f6+ang0XXXFn6gZ93R2HmoZ2M=; b=gRyBhQf+ziqR62sOHCY4haIzWxMPle2khbN2KNzDcyr8PcUUdrs13+MjKR6CEQcj/f gUxeyr82O8vpgfX6czlBovrxIm9JQs6sfoNSivxkZi4VGizkQrGyB/AimZdeW7PlDd/9 88FAvktwQPljj/RqfVcU0jHw+vQUUgsD+uNWY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=bevCrzZXqcPKAC/Hy4f6+ang0XXXFn6gZ93R2HmoZ2M=; b=1Gnv/Yo3QFu63JCr6p+2HRnb1szoem0tMZJjkjBYmbV/rI1h/KVWegWTPazRyQWolL iCpplUsyYARZoHVbg3rYzp756TCgo4wYIfpwOr0WyIiFdYd0gag1+GPpg4cLfeowOBHQ xn88VIWC6Y9Xu8ofDsLcNrY1RXBQ0mZp+TbMfhz3XYjKE2oMseBtjhFmznYLAp4hcF7r d3B4/3SeogcWL0znf7eoLY7anJgusBsxdzIQCmf/6c8XNkfmkU66jI31dHlwvgYslJbz mS5hS414Lhp9MuNj9jLpQi20sD13hhiuxJZ0+FNOjWBYIYqLQF/YMMJJ3Hu4W6Bydqd3 ESzA== X-Gm-Message-State: ACrzQf10MEeEtqoYB4deT09JsNPOMmqoCWs/NY/tYN9nLU/wH2HAgc9P fsBLpoIG/2ee4e5Jg251VnIRqtMoqwNvEw== X-Google-Smtp-Source: AMsMyM7MJdhUUjtw7ziref2f1kL/UqzUTe9y3yZlBNpwP4G+lzvkgzjE7iTjDPtgz2NGXCVnqRhsEw== X-Received: by 2002:a05:6214:1c44:b0:4bb:5fab:3af with SMTP id if4-20020a0562141c4400b004bb5fab03afmr42472717qvb.23.1667780211192; Sun, 06 Nov 2022 16:16:51 -0800 (PST) Received: from localhost.swdvt.lab.broadcom.net ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id k2-20020ac80742000000b0035badb499c7sm4904079qth.21.2022.11.06.16.16.49 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 06 Nov 2022 16:16:50 -0800 (PST) From: Michael Chan To: davem@davemloft.net Cc: netdev@vger.kernel.org, kuba@kernel.org, edumazet@google.com, pabeni@redhat.com, gospo@broadcom.com, pavan.chebbi@broadcom.com Subject: [PATCH net-next 3/3] bnxt_en: Add a non-real time mode to access NIC clock Date: Sun, 6 Nov 2022 19:16:32 -0500 Message-Id: <1667780192-3700-4-git-send-email-michael.chan@broadcom.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1667780192-3700-1-git-send-email-michael.chan@broadcom.com> References: <1667780192-3700-1-git-send-email-michael.chan@broadcom.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000012ff0105ecd65741" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org --00000000000012ff0105ecd65741 From: Pavan Chebbi When using a PHC that is shared between multiple hosts, in order to achieve consistent timestamps across all hosts, we need to isolate the PHC from any host making frequency adjustments. This patch adds a non-real time mode for this purpose. The implementation is based on a free running NIC hardware timer which is used as the timestamper time-base. Each host implements individual adjustments to a local timecounter based on the NIC free running timer. Cc: Richard Cochran Signed-off-by: Pavan Chebbi Reviewed-by: Andy Gospodarek Signed-off-by: Michael Chan --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 5 ++- drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c | 45 ++++++++++++++----- drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h | 7 ++- 3 files changed, 42 insertions(+), 15 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index d18e55b16375..d9ad325f7840 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -6985,8 +6985,11 @@ static int bnxt_hwrm_func_qcfg(struct bnxt *bp) if (flags & FUNC_QCFG_RESP_FLAGS_FW_DCBX_AGENT_ENABLED) bp->fw_cap |= BNXT_FW_CAP_DCBX_AGENT; } - if (BNXT_PF(bp) && (flags & FUNC_QCFG_RESP_FLAGS_MULTI_HOST)) + if (BNXT_PF(bp) && (flags & FUNC_QCFG_RESP_FLAGS_MULTI_HOST)) { bp->flags |= BNXT_FLAG_MULTI_HOST; + if (bp->fw_cap & BNXT_FW_CAP_PTP_RTC) + bp->fw_cap &= ~BNXT_FW_CAP_PTP_RTC; + } if (flags & FUNC_QCFG_RESP_FLAGS_RING_MONITOR_ENABLED) bp->fw_cap |= BNXT_FW_CAP_RING_MONITOR; diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c index 2132ce63193c..460cb20599f6 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c @@ -14,6 +14,7 @@ #include #include #include +#include #include "bnxt_hsi.h" #include "bnxt.h" #include "bnxt_hwrm.h" @@ -210,18 +211,37 @@ static int bnxt_ptp_adjfreq(struct ptp_clock_info *ptp_info, s32 ppb) ptp_info); struct hwrm_port_mac_cfg_input *req; struct bnxt *bp = ptp->bp; - int rc; + int rc = 0; - rc = hwrm_req_init(bp, req, HWRM_PORT_MAC_CFG); - if (rc) - return rc; + if (!(ptp->bp->fw_cap & BNXT_FW_CAP_PTP_RTC)) { + int neg_adj = 0; + u32 diff; + u64 adj; - req->ptp_freq_adj_ppb = cpu_to_le32(ppb); - req->enables = cpu_to_le32(PORT_MAC_CFG_REQ_ENABLES_PTP_FREQ_ADJ_PPB); - rc = hwrm_req_send(ptp->bp, req); - if (rc) - netdev_err(ptp->bp->dev, - "ptp adjfreq failed. rc = %d\n", rc); + if (ppb < 0) { + neg_adj = 1; + ppb = -ppb; + } + adj = ptp->cmult; + adj *= ppb; + diff = div_u64(adj, 1000000000ULL); + + spin_lock_bh(&ptp->ptp_lock); + timecounter_read(&ptp->tc); + ptp->cc.mult = neg_adj ? ptp->cmult - diff : ptp->cmult + diff; + spin_unlock_bh(&ptp->ptp_lock); + } else { + rc = hwrm_req_init(bp, req, HWRM_PORT_MAC_CFG); + if (rc) + return rc; + + req->ptp_freq_adj_ppb = cpu_to_le32(ppb); + req->enables = cpu_to_le32(PORT_MAC_CFG_REQ_ENABLES_PTP_FREQ_ADJ_PPB); + rc = hwrm_req_send(ptp->bp, req); + if (rc) + netdev_err(ptp->bp->dev, + "ptp adjfreq failed. rc = %d\n", rc); + } return rc; } @@ -846,8 +866,9 @@ static void bnxt_ptp_timecounter_init(struct bnxt *bp, bool init_tc) memset(&ptp->cc, 0, sizeof(ptp->cc)); ptp->cc.read = bnxt_cc_read; ptp->cc.mask = CYCLECOUNTER_MASK(48); - ptp->cc.shift = 0; - ptp->cc.mult = 1; + ptp->cc.shift = BNXT_CYCLES_SHIFT; + ptp->cc.mult = clocksource_khz2mult(BNXT_DEVCLK_FREQ, ptp->cc.shift); + ptp->cmult = ptp->cc.mult; ptp->next_overflow_check = jiffies + BNXT_PHC_OVERFLOW_PERIOD; } if (init_tc) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h index 4ce0a14c1e23..34162e07a119 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h @@ -17,6 +17,8 @@ #define BNXT_PTP_GRC_WIN_BASE 0x6000 #define BNXT_MAX_PHC_DRIFT 31000000 +#define BNXT_CYCLES_SHIFT 23 +#define BNXT_DEVCLK_FREQ 1000000 #define BNXT_LO_TIMER_MASK 0x0000ffffffffUL #define BNXT_HI_TIMER_MASK 0xffff00000000UL @@ -88,8 +90,9 @@ struct bnxt_ptp_cfg { u64 old_time; unsigned long next_period; unsigned long next_overflow_check; - /* 48-bit PHC overflows in 78 hours. Check overflow every 19 hours. */ - #define BNXT_PHC_OVERFLOW_PERIOD (19 * 3600 * HZ) + u32 cmult; + /* a 23b shift cyclecounter will overflow in ~36 mins. Check overflow every 18 mins. */ + #define BNXT_PHC_OVERFLOW_PERIOD (18 * 60 * HZ) u16 tx_seqid; u16 tx_hdr_off; -- 2.18.1 --00000000000012ff0105ecd65741 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQbQYJKoZIhvcNAQcCoIIQXjCCEFoCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3EMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS MyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA vbCmXCcsbZ/a0fRIQMBxp4gJnnyeneFYpEtNydrZZ+GeKSMdHiDgXD1UnRSIudKo+moQ6YlCOu4t rVWO/EiXfYnK7zeop26ry1RpKtogB7/O115zultAz64ydQYLe+a1e/czkALg3sgTcOOcFZTXk38e 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