linux-kernel - [PATCH net-next 7/8] net: stmmac: do not overwrite other flags when writing timestamp control

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230616100409.164583-8-alexis.lothore@bootlin.com>
Date:   Fri, 16 Jun 2023 12:04:08 +0200
From:   alexis.lothore@...tlin.com
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Richard Cochran <richardcochran@...il.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Nicolas Carrier <nicolas.carrier@...-timing.safrangroup.com>
Subject: [PATCH net-next 7/8] net: stmmac: do not overwrite other flags when writing timestamp control

From: Alexis Lothoré <alexis.lothore@...tlin.com>

On some versions of GMAC IP, for example, DWMAC1000, we may overwrite some
other flags like ATSEN0 when writing Timestamp Control register.
Avoid overwriting those additional flags by setting a read-write-modify
process only on flags of interest

Signed-off-by: Alexis Lothoré <alexis.lothore@...tlin.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 528d2e010926..ba483adf4e1a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -616,6 +616,10 @@ static void stmmac_get_rx_hwtstamp(struct stmmac_priv *priv, struct dma_desc *p,
  */
 static int stmmac_hwtstamp_set(struct net_device *dev, struct ifreq *ifr)
 {
+	u32 reset_mask = PTP_TCR_SNAPTYPSEL_1 | PTP_TCR_TSIPV4ENA |
+			 PTP_TCR_TSIPV6ENA | PTP_TCR_TSEVNTENA |
+			 PTP_TCR_TSMSTRENA | PTP_TCR_TSVER2ENA |
+			 PTP_TCR_TSIPENA | PTP_TCR_TSENALL;
 	struct stmmac_priv *priv = netdev_priv(dev);
 	struct hwtstamp_config config;
 	u32 ptp_v2 = 0;
@@ -783,7 +787,9 @@ static int stmmac_hwtstamp_set(struct net_device *dev, struct ifreq *ifr)
 	priv->hwts_rx_en = ((config.rx_filter == HWTSTAMP_FILTER_NONE) ? 0 : 1);
 	priv->hwts_tx_en = config.tx_type == HWTSTAMP_TX_ON;
 
-	priv->systime_flags = STMMAC_HWTS_ACTIVE;
+	priv->systime_flags = stmmac_config_hw_tstamping_get(priv, priv->ptpaddr);
+	priv->systime_flags &= ~reset_mask;
+	priv->systime_flags |= STMMAC_HWTS_ACTIVE;
 
 	if (priv->hwts_tx_en || priv->hwts_rx_en) {
 		priv->systime_flags |= tstamp_all | ptp_v2 |
-- 
2.41.0