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Wed, 30 Nov 2022 08:54:53 -0800 (PST) Date: Wed, 30 Nov 2022 18:54:43 +0200 From: Vladimir Oltean To: Horatiu Vultur Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, lars.povlsen@microchip.com, Steen.Hegelund@microchip.com, daniel.machon@microchip.com, richardcochran@gmail.com, UNGLinuxDriver@microchip.com Subject: Re: [PATCH net-next 4/4] net: lan966x: Add ptp trap rules Message-ID: <20221130165443.ewjwm3z7nbwmktcv@skbuf> References: <20221130143525.934906-1-horatiu.vultur@microchip.com> <20221130143525.934906-1-horatiu.vultur@microchip.com> <20221130143525.934906-5-horatiu.vultur@microchip.com> <20221130143525.934906-5-horatiu.vultur@microchip.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20221130143525.934906-5-horatiu.vultur@microchip.com> <20221130143525.934906-5-horatiu.vultur@microchip.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221130_085458_935995_839DB9F6 X-CRM114-Status: GOOD ( 25.91 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hello Horatiu, On Wed, Nov 30, 2022 at 03:35:25PM +0100, Horatiu Vultur wrote: > diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c b/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c > index e5a2bbe064f8f..1f6614ee83169 100644 > --- a/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c > +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c > @@ -3,6 +3,8 @@ > #include > > #include "lan966x_main.h" > +#include "vcap_api.h" > +#include "vcap_api_client.h" > > #define LAN966X_MAX_PTP_ID 512 > > @@ -18,6 +20,17 @@ > > #define TOD_ACC_PIN 0x7 > > +/* This represents the base rule ID for the PTP rules that are added in the > + * VCAP to trap frames to CPU. This number needs to be bigger than the maximum > + * number of entries that can exist in the VCAP. > + */ > +#define LAN966X_VCAP_PTP_RULE_ID 1000000 > +#define LAN966X_VCAP_L2_PTP_TRAP (LAN966X_VCAP_PTP_RULE_ID + 0) > +#define LAN966X_VCAP_IPV4_EV_PTP_TRAP (LAN966X_VCAP_PTP_RULE_ID + 1) > +#define LAN966X_VCAP_IPV4_GEN_PTP_TRAP (LAN966X_VCAP_PTP_RULE_ID + 2) > +#define LAN966X_VCAP_IPV6_EV_PTP_TRAP (LAN966X_VCAP_PTP_RULE_ID + 3) > +#define LAN966X_VCAP_IPV6_GEN_PTP_TRAP (LAN966X_VCAP_PTP_RULE_ID + 4) > + > enum { > PTP_PIN_ACTION_IDLE = 0, > PTP_PIN_ACTION_LOAD, > @@ -35,19 +48,229 @@ static u64 lan966x_ptp_get_nominal_value(void) > return 0x304d4873ecade305; > } > > +static int lan966x_ptp_add_trap(struct lan966x_port *port, > + int (*add_ptp_key)(struct vcap_rule *vrule, > + struct lan966x_port*), > + u32 rule_id, > + u16 proto) > +{ > + struct lan966x *lan966x = port->lan966x; > + struct vcap_rule *vrule; > + int err; > + > + vrule = vcap_get_rule(lan966x->vcap_ctrl, rule_id); > + if (vrule) { > + u32 value, mask; > + > + /* Just modify the ingress port mask and exit */ > + vcap_rule_get_key_u32(vrule, VCAP_KF_IF_IGR_PORT_MASK, > + &value, &mask); > + mask &= ~BIT(port->chip_port); > + vcap_rule_mod_key_u32(vrule, VCAP_KF_IF_IGR_PORT_MASK, > + value, mask); > + > + err = vcap_mod_rule(vrule); > + goto free_rule; > + } > + > + vrule = vcap_alloc_rule(lan966x->vcap_ctrl, port->dev, > + LAN966X_VCAP_CID_IS2_L0, > + VCAP_USER_PTP, 0, rule_id); > + if (!vrule) > + return -ENOMEM; > + if (IS_ERR(vrule)) > + return PTR_ERR(vrule); > + > + err = add_ptp_key(vrule, port); > + if (err) > + goto free_rule; > + > + err = vcap_set_rule_set_actionset(vrule, VCAP_AFS_BASE_TYPE); > + err |= vcap_rule_add_action_bit(vrule, VCAP_AF_CPU_COPY_ENA, VCAP_BIT_1); > + err |= vcap_rule_add_action_u32(vrule, VCAP_AF_MASK_MODE, LAN966X_PMM_REPLACE); > + err |= vcap_val_rule(vrule, proto); > + if (err) > + goto free_rule; > + > + err = vcap_add_rule(vrule); > + > +free_rule: > + /* Free the local copy of the rule */ > + vcap_free_rule(vrule); > + return err; > +} > + > +static int lan966x_ptp_del_trap(struct lan966x_port *port, > + u32 rule_id) > +{ > + struct lan966x *lan966x = port->lan966x; > + struct vcap_rule *vrule; > + u32 value, mask; > + int err; > + > + vrule = vcap_get_rule(lan966x->vcap_ctrl, rule_id); > + if (!vrule) > + return -EEXIST; > + > + vcap_rule_get_key_u32(vrule, VCAP_KF_IF_IGR_PORT_MASK, &value, &mask); > + mask |= BIT(port->chip_port); Does the VCAP API not abstract away the negative mask representation of the IGR_PORT_MASK field? I guess someone will stumble upon this in the future and introduce a bug. In ocelot, struct ocelot_vcap_filter :: ingress_port_mask ended being used quite in a wide variety of places. It would be quite messy, unintuitive and tiring to treat it like a reverse port mask everywhere it is used. In ocelot_vcap.c, it is just reversed in the vcap_key_set() call. > + > + /* No other port requires this trap, so it is safe to remove it */ > + if (mask == GENMASK(lan966x->num_phys_ports, 0)) { > + err = vcap_del_rule(lan966x->vcap_ctrl, port->dev, rule_id); > + goto free_rule; > + } > + > + vcap_rule_mod_key_u32(vrule, VCAP_KF_IF_IGR_PORT_MASK, value, mask); > + err = vcap_mod_rule(vrule); > + > +free_rule: > + vcap_free_rule(vrule); > + return err; > +} > + > +static int lan966x_ptp_add_l2_key(struct vcap_rule *vrule, > + struct lan966x_port *port) > +{ > + return vcap_rule_add_key_u32(vrule, VCAP_KF_ETYPE, ETH_P_1588, ~0); > +} > + > +static int lan966x_ptp_add_ip_event_key(struct vcap_rule *vrule, > + struct lan966x_port *port) > +{ > + return vcap_rule_add_key_u32(vrule, VCAP_KF_L4_DPORT, 319, ~0) || s/319/PTP_EV_PORT/ > + vcap_rule_add_key_bit(vrule, VCAP_KF_TCP_IS, VCAP_BIT_0); > +} > + > +static int lan966x_ptp_add_ip_general_key(struct vcap_rule *vrule, > + struct lan966x_port *port) > +{ > + return vcap_rule_add_key_u32(vrule, VCAP_KF_L4_DPORT, 320, ~0) || s/320/PTP_GEN_PORT/ > + vcap_rule_add_key_bit(vrule, VCAP_KF_TCP_IS, VCAP_BIT_0); > +} > + > +static int lan966x_ptp_add_l2_rule(struct lan966x_port *port) > +{ > + return lan966x_ptp_add_trap(port, lan966x_ptp_add_l2_key, > + LAN966X_VCAP_L2_PTP_TRAP, ETH_P_ALL); > +} > + > +static int lan966x_ptp_add_ipv4_rules(struct lan966x_port *port) > +{ > + int err; > + > + err = lan966x_ptp_add_trap(port, lan966x_ptp_add_ip_event_key, > + LAN966X_VCAP_IPV4_EV_PTP_TRAP, ETH_P_IP); > + if (err) > + return err; > + > + err = lan966x_ptp_add_trap(port, lan966x_ptp_add_ip_general_key, > + LAN966X_VCAP_IPV4_GEN_PTP_TRAP, ETH_P_IP); > + if (err) > + lan966x_ptp_del_trap(port, LAN966X_VCAP_IPV4_EV_PTP_TRAP); > + > + return err; > +} There's a comical amount of code duplication between this and ocelot_ptp.c, save for the fact that it was written by different people. Is there any possibility to reuse code with ocelot? _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel