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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Tony Lindgren , Judith Mendez Cc: Vincent MAILHOL , Simon Horman , linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Julien Panis , Markus Schneider-Pargmann Subject: [PATCH 06/14] can: m_can: Add rx coalescing ethtool support Date: Wed, 7 Feb 2024 10:32:12 +0100 Message-ID: <20240207093220.2681425-7-msp@baylibre.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240207093220.2681425-1-msp@baylibre.com> References: <20240207093220.2681425-1-msp@baylibre.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add the possibility to set coalescing parameters with ethtool. rx-frames-irq and rx-usecs-irq can only be set and unset together as the implemented mechanism would not work otherwise. rx-frames-irq can't be greater than the RX FIFO size. Also all values can only be changed if the chip is not active. Polling is excluded from irq coalescing support. Signed-off-by: Markus Schneider-Pargmann --- drivers/net/can/m_can/m_can.c | 55 ++++++++++++++++++++++++++++++++++- 1 file changed, 54 insertions(+), 1 deletion(-) diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index 9b3e8e09f3aa..6dad1f569f82 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -1977,7 +1977,57 @@ static const struct net_device_ops m_can_netdev_ops = =3D { .ndo_change_mtu =3D can_change_mtu, }; =20 +static int m_can_get_coalesce(struct net_device *dev, + struct ethtool_coalesce *ec, + struct kernel_ethtool_coalesce *kec, + struct netlink_ext_ack *ext_ack) +{ + struct m_can_classdev *cdev =3D netdev_priv(dev); + + ec->rx_max_coalesced_frames_irq =3D cdev->rx_max_coalesced_frames_irq; + ec->rx_coalesce_usecs_irq =3D cdev->rx_coalesce_usecs_irq; + + return 0; +} + +static int m_can_set_coalesce(struct net_device *dev, + struct ethtool_coalesce *ec, + struct kernel_ethtool_coalesce *kec, + struct netlink_ext_ack *ext_ack) +{ + struct m_can_classdev *cdev =3D netdev_priv(dev); + + if (cdev->can.state !=3D CAN_STATE_STOPPED) { + netdev_err(dev, "Device is in use, please shut it down first\n"); + return -EBUSY; + } + + if (ec->rx_max_coalesced_frames_irq > cdev->mcfg[MRAM_RXF0].num) { + netdev_err(dev, "rx-frames-irq %u greater than the RX FIFO %u\n", + ec->rx_max_coalesced_frames_irq, + cdev->mcfg[MRAM_RXF0].num); + return -EINVAL; + } + if ((ec->rx_max_coalesced_frames_irq =3D=3D 0) !=3D (ec->rx_coalesce_usec= s_irq =3D=3D 0)) { + netdev_err(dev, "rx-frames-irq and rx-usecs-irq can only be set together= \n"); + return -EINVAL; + } + + cdev->rx_max_coalesced_frames_irq =3D ec->rx_max_coalesced_frames_irq; + cdev->rx_coalesce_usecs_irq =3D ec->rx_coalesce_usecs_irq; + + return 0; +} + static const struct ethtool_ops m_can_ethtool_ops =3D { + .supported_coalesce_params =3D ETHTOOL_COALESCE_RX_USECS_IRQ | + ETHTOOL_COALESCE_RX_MAX_FRAMES_IRQ, + .get_ts_info =3D ethtool_op_get_ts_info, + .get_coalesce =3D m_can_get_coalesce, + .set_coalesce =3D m_can_set_coalesce, +}; + +static const struct ethtool_ops m_can_ethtool_ops_polling =3D { .get_ts_info =3D ethtool_op_get_ts_info, }; =20 @@ -1985,7 +2035,10 @@ static int register_m_can_dev(struct net_device *dev) { dev->flags |=3D IFF_ECHO; /* we support local echo */ dev->netdev_ops =3D &m_can_netdev_ops; - dev->ethtool_ops =3D &m_can_ethtool_ops; + if (dev->irq) + dev->ethtool_ops =3D &m_can_ethtool_ops; + else + dev->ethtool_ops =3D &m_can_ethtool_ops_polling; =20 return register_candev(dev); } --=20 2.43.0