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Message-ID: <ZNYDZkjuFjF7n3VV@vergenet.net> Date: Fri, 11 Aug 2023 11:46:14 +0200 From: Simon Horman <horms@...nel.org> To: Roger Quadros <rogerq@...nel.org> Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, vladimir.oltean@....com, s-vadapalli@...com, srk@...com, vigneshr@...com, p-varis@...com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2] net: ethernet: ti: am65-cpsw-qos: Add Frame Preemption MAC Merge support On Thu, Aug 10, 2023 at 06:25:38PM +0300, Roger Quadros wrote: > Add driver support for viewing / changing the MAC Merge sublayer > parameters and seeing the verification state machine's current state > via ethtool. > > As hardware does not support interrupt notification for verification > events we resort to polling on link up. On link up we try a couple of > times for verification success and if unsuccessful then give up. > > The Frame Preemption feature is described in the Technical Reference > Manual [1] in section: > 12.3.1.4.6.7 Intersperced Express Traffic (IET – P802.3br/D2.0) > > Due to Silicon Errata i2208 [2] we set limit min IET fragment size to 124. > > [1] AM62x TRM - https://www.ti.com/lit/ug/spruiv7a/spruiv7a.pdf > [2] AM62x Silicon Errata - https://www.ti.com/lit/er/sprz487c/sprz487c.pdf > > Signed-off-by: Roger Quadros <rogerq@...nel.org> Hi Roger, some minor feedback from my side. ... > +static int am65_cpsw_get_mm(struct net_device *ndev, struct ethtool_mm_state *state) > +{ > + struct am65_cpsw_common *common = am65_ndev_to_common(ndev); > + u32 port_ctrl, cmn_ctrl, iet_ctrl, iet_status, verify_cnt; > + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); > + struct am65_cpsw_ndev_priv *priv = netdev_priv(ndev); > + u32 add_frag_size; > + > + mutex_lock(&priv->mm_lock); > + > + iet_ctrl = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL); > + cmn_ctrl = readl(common->cpsw_base + AM65_CPSW_REG_CTL); cmn_ctrl appears to be set but not used. Is this intentional? > + port_ctrl = readl(port->port_base + AM65_CPSW_PN_REG_CTL); > + > + state->tx_enabled = !!(iet_ctrl & AM65_CPSW_PN_IET_MAC_PENABLE); > + state->pmac_enabled = !!(port_ctrl & AM65_CPSW_PN_CTL_IET_PORT_EN); > + > + iet_status = readl(port->port_base + AM65_CPSW_PN_REG_IET_STATUS); > + > + if (iet_ctrl & AM65_CPSW_PN_IET_MAC_DISABLEVERIFY) > + state->verify_status = ETHTOOL_MM_VERIFY_STATUS_DISABLED; > + else if (iet_status & AM65_CPSW_PN_MAC_VERIFIED) > + state->verify_status = ETHTOOL_MM_VERIFY_STATUS_SUCCEEDED; > + else if (iet_status & AM65_CPSW_PN_MAC_VERIFY_FAIL) > + state->verify_status = ETHTOOL_MM_VERIFY_STATUS_FAILED; > + else > + state->verify_status = ETHTOOL_MM_VERIFY_STATUS_UNKNOWN; > + > + add_frag_size = AM65_CPSW_PN_IET_MAC_GET_ADDFRAGSIZE(iet_ctrl); > + state->tx_min_frag_size = ethtool_mm_frag_size_add_to_min(add_frag_size); > + > + /* Errata i2208: RX min fragment size cannot be less than 124 */ > + state->rx_min_frag_size = 124; > + > + /* FPE active if common tx_enabled and verification success or disabled (forced) */ > + state->tx_active = state->tx_enabled && > + (state->verify_status == ETHTOOL_MM_VERIFY_STATUS_SUCCEEDED || > + state->verify_status == ETHTOOL_MM_VERIFY_STATUS_DISABLED); > + state->verify_enabled = !(iet_ctrl & AM65_CPSW_PN_IET_MAC_DISABLEVERIFY); > + > + verify_cnt = AM65_CPSW_PN_MAC_GET_VERIFY_CNT(readl(port->port_base + > + AM65_CPSW_PN_REG_IET_VERIFY)); Likewise, verify_cnt appears to be set but not used. > + state->verify_time = port->qos.iet.verify_time_ms; > + state->max_verify_time = am65_cpsw_iet_get_verify_timeout_ms(AM65_CPSW_PN_MAC_VERIFY_CNT_MASK, > + port); > + mutex_unlock(&priv->mm_lock); > + > + return 0; > +} ... > +void am65_cpsw_iet_change_preemptible_tcs(struct am65_cpsw_port *port, u8 preemptible_tcs) nit: should this function be static? > +{ > + port->qos.iet.preemptible_tcs = preemptible_tcs; > + am65_cpsw_iet_commit_preemptible_tcs(port); > +} > + > +void am65_cpsw_iet_link_state_update(struct net_device *ndev) Ditto > +{ > + struct am65_cpsw_ndev_priv *priv = am65_ndev_to_priv(ndev); > + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); > + > + mutex_lock(&priv->mm_lock); > + am65_cpsw_iet_commit_preemptible_tcs(port); > + mutex_unlock(&priv->mm_lock); > +} ...
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