From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Petazzoni Subject: [PATCHv2 net-next 02/11] net: mvpp2: handle too large value in mvpp2_rx_time_coal_set() Date: Wed, 28 Dec 2016 17:45:58 +0100 Message-ID: <1482943567-12483-3-git-send-email-thomas.petazzoni@free-electrons.com> References: <1482943567-12483-1-git-send-email-thomas.petazzoni@free-electrons.com> Cc: Jason Cooper , Andrew Lunn , Sebastian Hesselbarth , Gregory Clement , Nadav Haklai , Hanna Hawa , Yehuda Yitschak , linux-arm-kernel@lists.infradead.org, Stefan Chulski , Marcin Wojtas , Thomas Petazzoni To: netdev@vger.kernel.org, "David S. Miller" Return-path: Received: from mail.free-electrons.com ([62.4.15.54]:47509 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751726AbcL1QqY (ORCPT ); Wed, 28 Dec 2016 11:46:24 -0500 In-Reply-To: <1482943567-12483-1-git-send-email-thomas.petazzoni@free-electrons.com> Sender: netdev-owner@vger.kernel.org List-ID: When configuring the MVPP2_ISR_RX_THRESHOLD_REG with the RX coalescing time threshold, we do not check for the maximum allowed value supported by the driver, which means we might overflow and use a bogus value. This commit adds a check for this situation, and if a value higher than what is supported by the hardware is provided, then we use the maximum value supported by the hardware. Signed-off-by: Thomas Petazzoni --- drivers/net/ethernet/marvell/mvpp2.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/ethernet/marvell/mvpp2.c b/drivers/net/ethernet/marvell/mvpp2.c index 02d91e4..a1ba89f 100644 --- a/drivers/net/ethernet/marvell/mvpp2.c +++ b/drivers/net/ethernet/marvell/mvpp2.c @@ -154,6 +154,7 @@ /* Interrupt Cause and Mask registers */ #define MVPP2_ISR_RX_THRESHOLD_REG(rxq) (0x5200 + 4 * (rxq)) +#define MVPP2_MAX_ISR_RX_THRESHOLD 0xfffff0 #define MVPP2_ISR_RXQ_GROUP_REG(rxq) (0x5400 + 4 * (rxq)) #define MVPP2_ISR_ENABLE_REG(port) (0x5420 + 4 * (port)) #define MVPP2_ISR_ENABLE_INTERRUPT(mask) ((mask) & 0xffff) @@ -4397,6 +4398,12 @@ static void mvpp2_rx_time_coal_set(struct mvpp2_port *port, u32 val; val = (port->priv->tclk / USEC_PER_SEC) * usec; + + if (val > MVPP2_MAX_ISR_RX_THRESHOLD) { + val = MVPP2_MAX_ISR_RX_THRESHOLD; + usec = (val * USEC_PER_SEC) / port->priv->tclk; + } + mvpp2_write(port->priv, MVPP2_ISR_RX_THRESHOLD_REG(rxq->id), val); rxq->time_coal = usec; -- 2.7.4 From mboxrd@z Thu Jan 1 00:00:00 1970 From: thomas.petazzoni@free-electrons.com (Thomas Petazzoni) Date: Wed, 28 Dec 2016 17:45:58 +0100 Subject: [PATCHv2 net-next 02/11] net: mvpp2: handle too large value in mvpp2_rx_time_coal_set() In-Reply-To: <1482943567-12483-1-git-send-email-thomas.petazzoni@free-electrons.com> References: <1482943567-12483-1-git-send-email-thomas.petazzoni@free-electrons.com> Message-ID: <1482943567-12483-3-git-send-email-thomas.petazzoni@free-electrons.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org When configuring the MVPP2_ISR_RX_THRESHOLD_REG with the RX coalescing time threshold, we do not check for the maximum allowed value supported by the driver, which means we might overflow and use a bogus value. This commit adds a check for this situation, and if a value higher than what is supported by the hardware is provided, then we use the maximum value supported by the hardware. Signed-off-by: Thomas Petazzoni --- drivers/net/ethernet/marvell/mvpp2.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/ethernet/marvell/mvpp2.c b/drivers/net/ethernet/marvell/mvpp2.c index 02d91e4..a1ba89f 100644 --- a/drivers/net/ethernet/marvell/mvpp2.c +++ b/drivers/net/ethernet/marvell/mvpp2.c @@ -154,6 +154,7 @@ /* Interrupt Cause and Mask registers */ #define MVPP2_ISR_RX_THRESHOLD_REG(rxq) (0x5200 + 4 * (rxq)) +#define MVPP2_MAX_ISR_RX_THRESHOLD 0xfffff0 #define MVPP2_ISR_RXQ_GROUP_REG(rxq) (0x5400 + 4 * (rxq)) #define MVPP2_ISR_ENABLE_REG(port) (0x5420 + 4 * (port)) #define MVPP2_ISR_ENABLE_INTERRUPT(mask) ((mask) & 0xffff) @@ -4397,6 +4398,12 @@ static void mvpp2_rx_time_coal_set(struct mvpp2_port *port, u32 val; val = (port->priv->tclk / USEC_PER_SEC) * usec; + + if (val > MVPP2_MAX_ISR_RX_THRESHOLD) { + val = MVPP2_MAX_ISR_RX_THRESHOLD; + usec = (val * USEC_PER_SEC) / port->priv->tclk; + } + mvpp2_write(port->priv, MVPP2_ISR_RX_THRESHOLD_REG(rxq->id), val); rxq->time_coal = usec; -- 2.7.4