From patchwork Mon May 16 19:35:49 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 573282 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 D4758C433F5 for ; Mon, 16 May 2022 20:08:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241307AbiEPUHJ (ORCPT ); Mon, 16 May 2022 16:07:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46676 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348198AbiEPT62 (ORCPT ); Mon, 16 May 2022 15:58:28 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 78B8349277; Mon, 16 May 2022 12:50:18 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 26053B81612; Mon, 16 May 2022 19:50:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 73249C385AA; Mon, 16 May 2022 19:50:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652730615; bh=D0V9cvmne9QhS6Ya73lFpN8FSdSoxKiZMZLj42fZCRw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Hex/4WaIeRNcSuFX7EMkm7jY0g5iUFxip+hh7m8KCg4nNNwD2OwFzhDU7L+yCQ+lf mYVd+Gq766qdHts+R5WB/NB5etDeULN29t/KdCE7rFVDSMGj9lB0iWBfG3h6V8Ra1/ mbDYuJ7FKejyq1PuhJ3+cPsOxXKARvD2Lmq+Z2EY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Michal Michalik , Jacob Keller , Paul Menzel , Tony Nguyen , Sasha Levin , Gurucharan Subject: [PATCH 5.15 015/102] ice: fix PTP stale Tx timestamps cleanup Date: Mon, 16 May 2022 21:35:49 +0200 Message-Id: <20220516193624.435938166@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220516193623.989270214@linuxfoundation.org> References: <20220516193623.989270214@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Michal Michalik [ Upstream commit a11b6c1a383ff092f432e040c20e032503785d47 ] Read stale PTP Tx timestamps from PHY on cleanup. After running out of Tx timestamps request handlers, hardware (HW) stops reporting finished requests. Function ice_ptp_tx_tstamp_cleanup() used to only clean up stale handlers in driver and was leaving the hardware registers not read. Not reading stale PTP Tx timestamps prevents next interrupts from arriving and makes timestamping unusable. Fixes: ea9b847cda64 ("ice: enable transmit timestamps for E810 devices") Signed-off-by: Michal Michalik Reviewed-by: Jacob Keller Reviewed-by: Paul Menzel Tested-by: Gurucharan (A Contingent worker at Intel) Signed-off-by: Tony Nguyen Signed-off-by: Sasha Levin --- drivers/net/ethernet/intel/ice/ice_ptp.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c index eb9193682579..ef26ff351b57 100644 --- a/drivers/net/ethernet/intel/ice/ice_ptp.c +++ b/drivers/net/ethernet/intel/ice/ice_ptp.c @@ -1375,6 +1375,7 @@ ice_ptp_init_tx_e810(struct ice_pf *pf, struct ice_ptp_tx *tx) /** * ice_ptp_tx_tstamp_cleanup - Cleanup old timestamp requests that got dropped + * @hw: pointer to the hw struct * @tx: PTP Tx tracker to clean up * * Loop through the Tx timestamp requests and see if any of them have been @@ -1383,7 +1384,7 @@ ice_ptp_init_tx_e810(struct ice_pf *pf, struct ice_ptp_tx *tx) * timestamp will never be captured. This might happen if the packet gets * discarded before it reaches the PHY timestamping block. */ -static void ice_ptp_tx_tstamp_cleanup(struct ice_ptp_tx *tx) +static void ice_ptp_tx_tstamp_cleanup(struct ice_hw *hw, struct ice_ptp_tx *tx) { u8 idx; @@ -1392,11 +1393,16 @@ static void ice_ptp_tx_tstamp_cleanup(struct ice_ptp_tx *tx) for_each_set_bit(idx, tx->in_use, tx->len) { struct sk_buff *skb; + u64 raw_tstamp; /* Check if this SKB has been waiting for too long */ if (time_is_after_jiffies(tx->tstamps[idx].start + 2 * HZ)) continue; + /* Read tstamp to be able to use this register again */ + ice_read_phy_tstamp(hw, tx->quad, idx + tx->quad_offset, + &raw_tstamp); + spin_lock(&tx->lock); skb = tx->tstamps[idx].skb; tx->tstamps[idx].skb = NULL; @@ -1418,7 +1424,7 @@ static void ice_ptp_periodic_work(struct kthread_work *work) ice_ptp_update_cached_phctime(pf); - ice_ptp_tx_tstamp_cleanup(&pf->ptp.port.tx); + ice_ptp_tx_tstamp_cleanup(&pf->hw, &pf->ptp.port.tx); /* Run twice a second */ kthread_queue_delayed_work(ptp->kworker, &ptp->work,