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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Julien Panis , Judith Mendez , Markus Schneider-Pargmann Subject: [PATCH v6 07/14] can: m_can: Add tx coalescing ethtool support Date: Fri, 29 Sep 2023 16:12:57 +0200 Message-Id: <20230929141304.3934380-8-msp@baylibre.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230929141304.3934380-1-msp@baylibre.com> References: <20230929141304.3934380-1-msp@baylibre.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-can@vger.kernel.org Add TX support to get/set functions for ethtool coalescing. tx-frames-irq and tx-usecs-irq can only be set/unset together. tx-frames-irq needs to be less than TXE and TXB. As rx and tx share the same timer, rx-usecs-irq and tx-usecs-irq can be enabled/disabled individually but they need to have the same value if enabled. Polling is excluded from TX irq coalescing. Signed-off-by: Markus Schneider-Pargmann --- drivers/net/can/m_can/m_can.c | 38 ++++++++++++++++++++++++++++++++++- 1 file changed, 37 insertions(+), 1 deletion(-) diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index 546193ab6e0d..1c021d99bae2 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -1985,6 +1985,8 @@ static int m_can_get_coalesce(struct net_device *dev, ec->rx_max_coalesced_frames_irq = cdev->rx_max_coalesced_frames_irq; ec->rx_coalesce_usecs_irq = cdev->rx_coalesce_usecs_irq; + ec->tx_max_coalesced_frames_irq = cdev->tx_max_coalesced_frames_irq; + ec->tx_coalesce_usecs_irq = cdev->tx_coalesce_usecs_irq; return 0; } @@ -2011,16 +2013,50 @@ static int m_can_set_coalesce(struct net_device *dev, netdev_err(dev, "rx-frames-irq and rx-usecs-irq can only be set together\n"); return -EINVAL; } + if (ec->tx_max_coalesced_frames_irq > cdev->mcfg[MRAM_TXE].num) { + netdev_err(dev, "tx-frames-irq %u greater than the TX event FIFO %u\n", + ec->tx_max_coalesced_frames_irq, + cdev->mcfg[MRAM_TXE].num); + return -EINVAL; + } + if (ec->tx_max_coalesced_frames_irq > cdev->mcfg[MRAM_TXB].num) { + netdev_err(dev, "tx-frames-irq %u greater than the TX FIFO %u\n", + ec->tx_max_coalesced_frames_irq, + cdev->mcfg[MRAM_TXB].num); + return -EINVAL; + } + if ((ec->tx_max_coalesced_frames_irq == 0) != (ec->tx_coalesce_usecs_irq == 0)) { + netdev_err(dev, "tx-frames-irq and tx-usecs-irq can only be set together\n"); + return -EINVAL; + } + if (ec->rx_coalesce_usecs_irq != 0 && ec->tx_coalesce_usecs_irq != 0 && + ec->rx_coalesce_usecs_irq != ec->tx_coalesce_usecs_irq) { + netdev_err(dev, "rx-usecs-irq %u needs to be equal to tx-usecs-irq %u if both are enabled\n", + ec->rx_coalesce_usecs_irq, + ec->tx_coalesce_usecs_irq); + return -EINVAL; + } cdev->rx_max_coalesced_frames_irq = ec->rx_max_coalesced_frames_irq; cdev->rx_coalesce_usecs_irq = ec->rx_coalesce_usecs_irq; + cdev->tx_max_coalesced_frames_irq = ec->tx_max_coalesced_frames_irq; + cdev->tx_coalesce_usecs_irq = ec->tx_coalesce_usecs_irq; + + if (cdev->rx_coalesce_usecs_irq) + cdev->irq_timer_wait = + ns_to_ktime(cdev->rx_coalesce_usecs_irq * NSEC_PER_USEC); + else + cdev->irq_timer_wait = + ns_to_ktime(cdev->tx_coalesce_usecs_irq * NSEC_PER_USEC); return 0; } static const struct ethtool_ops m_can_ethtool_ops = { .supported_coalesce_params = ETHTOOL_COALESCE_RX_USECS_IRQ | - ETHTOOL_COALESCE_RX_MAX_FRAMES_IRQ, + ETHTOOL_COALESCE_RX_MAX_FRAMES_IRQ | + ETHTOOL_COALESCE_TX_USECS_IRQ | + ETHTOOL_COALESCE_TX_MAX_FRAMES_IRQ, .get_ts_info = ethtool_op_get_ts_info, .get_coalesce = m_can_get_coalesce, .set_coalesce = m_can_set_coalesce, -- 2.40.1