diff options
Diffstat (limited to 'drivers/net/dsa/microchip/ksz_dcb.c')
| -rw-r--r-- | drivers/net/dsa/microchip/ksz_dcb.c | 819 |
1 files changed, 819 insertions, 0 deletions
diff --git a/drivers/net/dsa/microchip/ksz_dcb.c b/drivers/net/dsa/microchip/ksz_dcb.c new file mode 100644 index 0000000000..086bc9b3cf --- /dev/null +++ b/drivers/net/dsa/microchip/ksz_dcb.c @@ -0,0 +1,819 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2024 Pengutronix, Oleksij Rempel <kernel@pengutronix.de> + +#include <linux/dsa/ksz_common.h> +#include <net/dsa.h> +#include <net/dscp.h> +#include <net/ieee8021q.h> + +#include "ksz_common.h" +#include "ksz_dcb.h" +#include "ksz8.h" + +#define KSZ8_REG_PORT_1_CTRL_0 0x10 +#define KSZ8_PORT_DIFFSERV_ENABLE BIT(6) +#define KSZ8_PORT_802_1P_ENABLE BIT(5) +#define KSZ8_PORT_BASED_PRIO_M GENMASK(4, 3) + +#define KSZ88X3_REG_TOS_DSCP_CTRL 0x60 +#define KSZ8765_REG_TOS_DSCP_CTRL 0x90 + +#define KSZ9477_REG_SW_MAC_TOS_CTRL 0x033e +#define KSZ9477_SW_TOS_DSCP_REMAP BIT(0) +#define KSZ9477_SW_TOS_DSCP_DEFAULT_PRIO_M GENMASK(5, 3) + +#define KSZ9477_REG_DIFFSERV_PRIO_MAP 0x0340 + +#define KSZ9477_REG_PORT_MRI_PRIO_CTRL 0x0801 +#define KSZ9477_PORT_HIGHEST_PRIO BIT(7) +#define KSZ9477_PORT_OR_PRIO BIT(6) +#define KSZ9477_PORT_MAC_PRIO_ENABLE BIT(4) +#define KSZ9477_PORT_VLAN_PRIO_ENABLE BIT(3) +#define KSZ9477_PORT_802_1P_PRIO_ENABLE BIT(2) +#define KSZ9477_PORT_DIFFSERV_PRIO_ENABLE BIT(1) +#define KSZ9477_PORT_ACL_PRIO_ENABLE BIT(0) + +#define KSZ9477_REG_PORT_MRI_MAC_CTRL 0x0802 +#define KSZ9477_PORT_BASED_PRIO_M GENMASK(2, 0) + +struct ksz_apptrust_map { + u8 apptrust; + u8 bit; +}; + +static const struct ksz_apptrust_map ksz8_apptrust_map_to_bit[] = { + { DCB_APP_SEL_PCP, KSZ8_PORT_802_1P_ENABLE }, + { IEEE_8021QAZ_APP_SEL_DSCP, KSZ8_PORT_DIFFSERV_ENABLE }, +}; + +static const struct ksz_apptrust_map ksz9477_apptrust_map_to_bit[] = { + { DCB_APP_SEL_PCP, KSZ9477_PORT_802_1P_PRIO_ENABLE }, + { IEEE_8021QAZ_APP_SEL_DSCP, KSZ9477_PORT_DIFFSERV_PRIO_ENABLE }, +}; + +/* ksz_supported_apptrust[] - Supported apptrust selectors and Priority Order + * of Internal Priority Map (IPM) sources. + * + * This array defines the apptrust selectors supported by the hardware, where + * the index within the array indicates the priority of the selector - lower + * indices correspond to higher priority. This fixed priority scheme is due to + * the hardware's design, which does not support configurable priority among + * different priority sources. + * + * The priority sources, including Tail Tag, ACL, VLAN PCP and DSCP are ordered + * by the hardware's fixed logic, as detailed below. The order reflects a + * non-configurable precedence where certain types of priority information + * override others: + * + * 1. Tail Tag - Highest priority, overrides ACL, VLAN PCP, and DSCP priorities. + * 2. ACL - Overrides VLAN PCP and DSCP priorities. + * 3. VLAN PCP - Overrides DSCP priority. + * 4. DSCP - Lowest priority, does not override any other priority source. + * + * In this context, the array's lower index (higher priority) for + * 'DCB_APP_SEL_PCP' suggests its relative priority over + * 'IEEE_8021QAZ_APP_SEL_DSCP' within the system's fixed priority scheme. + * + * DCB_APP_SEL_PCP - Priority Code Point selector + * IEEE_8021QAZ_APP_SEL_DSCP - Differentiated Services Code Point selector + */ +static const u8 ksz_supported_apptrust[] = { + DCB_APP_SEL_PCP, + IEEE_8021QAZ_APP_SEL_DSCP, +}; + +static const char * const ksz_supported_apptrust_variants[] = { + "empty", "dscp", "pcp", "dscp pcp" +}; + +static void ksz_get_default_port_prio_reg(struct ksz_device *dev, int *reg, + u8 *mask, int *shift) +{ + if (is_ksz8(dev)) { + *reg = KSZ8_REG_PORT_1_CTRL_0; + *mask = KSZ8_PORT_BASED_PRIO_M; + *shift = __bf_shf(KSZ8_PORT_BASED_PRIO_M); + } else { + *reg = KSZ9477_REG_PORT_MRI_MAC_CTRL; + *mask = KSZ9477_PORT_BASED_PRIO_M; + *shift = __bf_shf(KSZ9477_PORT_BASED_PRIO_M); + } +} + +/** + * ksz_get_dscp_prio_reg - Retrieves the DSCP-to-priority-mapping register + * @dev: Pointer to the KSZ switch device structure + * @reg: Pointer to the register address to be set + * @per_reg: Pointer to the number of DSCP values per register + * @mask: Pointer to the mask to be set + * + * This function retrieves the DSCP to priority mapping register, the number of + * DSCP values per register, and the mask to be set. + */ +static void ksz_get_dscp_prio_reg(struct ksz_device *dev, int *reg, + int *per_reg, u8 *mask) +{ + if (ksz_is_ksz87xx(dev)) { + *reg = KSZ8765_REG_TOS_DSCP_CTRL; + *per_reg = 4; + *mask = GENMASK(1, 0); + } else if (ksz_is_ksz88x3(dev)) { + *reg = KSZ88X3_REG_TOS_DSCP_CTRL; + *per_reg = 4; + *mask = GENMASK(1, 0); + } else { + *reg = KSZ9477_REG_DIFFSERV_PRIO_MAP; + *per_reg = 2; + *mask = GENMASK(2, 0); + } +} + +/** + * ksz_get_apptrust_map_and_reg - Retrieves the apptrust map and register + * @dev: Pointer to the KSZ switch device structure + * @map: Pointer to the apptrust map to be set + * @reg: Pointer to the register address to be set + * @mask: Pointer to the mask to be set + * + * This function retrieves the apptrust map and register address for the + * apptrust configuration. + */ +static void ksz_get_apptrust_map_and_reg(struct ksz_device *dev, + const struct ksz_apptrust_map **map, + int *reg, u8 *mask) +{ + if (is_ksz8(dev)) { + *map = ksz8_apptrust_map_to_bit; + *reg = KSZ8_REG_PORT_1_CTRL_0; + *mask = KSZ8_PORT_DIFFSERV_ENABLE | KSZ8_PORT_802_1P_ENABLE; + } else { + *map = ksz9477_apptrust_map_to_bit; + *reg = KSZ9477_REG_PORT_MRI_PRIO_CTRL; + *mask = KSZ9477_PORT_802_1P_PRIO_ENABLE | + KSZ9477_PORT_DIFFSERV_PRIO_ENABLE; + } +} + +/** + * ksz_port_get_default_prio - Retrieves the default priority for a port on a + * KSZ switch + * @ds: Pointer to the DSA switch structure + * @port: Port number from which to get the default priority + * + * This function fetches the default priority for the specified port on a KSZ + * switch. + * + * Return: The default priority of the port on success, or a negative error + * code on failure. + */ +int ksz_port_get_default_prio(struct dsa_switch *ds, int port) +{ + struct ksz_device *dev = ds->priv; + int ret, reg, shift; + u8 data, mask; + + ksz_get_default_port_prio_reg(dev, ®, &mask, &shift); + + ret = ksz_pread8(dev, port, reg, &data); + if (ret) + return ret; + + return (data & mask) >> shift; +} + +/** + * ksz88x3_port_set_default_prio_quirks - Quirks for default priority + * @dev: Pointer to the KSZ switch device structure + * @port: Port number for which to set the default priority + * @prio: Priority value to set + * + * This function implements quirks for setting the default priority on KSZ88x3 + * devices. On Port 2, no other priority providers are working + * except of PCP. So, configuring default priority on Port 2 is not possible. + * On Port 1, it is not possible to configure port priority if PCP + * apptrust on Port 2 is disabled. Since we disable multiple queues on the + * switch to disable PCP on Port 2, we need to ensure that the default priority + * configuration on Port 1 is in agreement with the configuration on Port 2. + * + * Return: 0 on success, or a negative error code on failure + */ +static int ksz88x3_port_set_default_prio_quirks(struct ksz_device *dev, int port, + u8 prio) +{ + if (!prio) + return 0; + + if (port == KSZ_PORT_2) { + dev_err(dev->dev, "Port priority configuration is not working on Port 2\n"); + return -EINVAL; + } else if (port == KSZ_PORT_1) { + u8 port2_data; + int ret; + + ret = ksz_pread8(dev, KSZ_PORT_2, KSZ8_REG_PORT_1_CTRL_0, + &port2_data); + if (ret) + return ret; + + if (!(port2_data & KSZ8_PORT_802_1P_ENABLE)) { + dev_err(dev->dev, "Not possible to configure port priority on Port 1 if PCP apptrust on Port 2 is disabled\n"); + return -EINVAL; + } + } + + return 0; +} + +/** + * ksz_port_set_default_prio - Sets the default priority for a port on a KSZ + * switch + * @ds: Pointer to the DSA switch structure + * @port: Port number for which to set the default priority + * @prio: Priority value to set + * + * This function sets the default priority for the specified port on a KSZ + * switch. + * + * Return: 0 on success, or a negative error code on failure. + */ +int ksz_port_set_default_prio(struct dsa_switch *ds, int port, u8 prio) +{ + struct ksz_device *dev = ds->priv; + int reg, shift, ret; + u8 mask; + + if (prio >= dev->info->num_ipms) + return -EINVAL; + + if (ksz_is_ksz88x3(dev)) { + ret = ksz88x3_port_set_default_prio_quirks(dev, port, prio); + if (ret) + return ret; + } + + ksz_get_default_port_prio_reg(dev, ®, &mask, &shift); + + return ksz_prmw8(dev, port, reg, mask, (prio << shift) & mask); +} + +/** + * ksz_port_get_dscp_prio - Retrieves the priority for a DSCP value on a KSZ + * switch + * @ds: Pointer to the DSA switch structure + * @port: Port number for which to get the priority + * @dscp: DSCP value for which to get the priority + * + * This function fetches the priority value from switch global DSCP-to-priorty + * mapping table for the specified DSCP value. + * + * Return: The priority value for the DSCP on success, or a negative error + * code on failure. + */ +int ksz_port_get_dscp_prio(struct dsa_switch *ds, int port, u8 dscp) +{ + struct ksz_device *dev = ds->priv; + int reg, per_reg, ret, shift; + u8 data, mask; + + ksz_get_dscp_prio_reg(dev, ®, &per_reg, &mask); + + /* If DSCP remapping is disabled, DSCP bits 3-5 are used as Internal + * Priority Map (IPM) + */ + if (!is_ksz8(dev)) { + ret = ksz_read8(dev, KSZ9477_REG_SW_MAC_TOS_CTRL, &data); + if (ret) + return ret; + + /* If DSCP remapping is disabled, DSCP bits 3-5 are used as + * Internal Priority Map (IPM) + */ + if (!(data & KSZ9477_SW_TOS_DSCP_REMAP)) + return FIELD_GET(KSZ9477_SW_TOS_DSCP_DEFAULT_PRIO_M, + dscp); + } + + /* In case DSCP remapping is enabled, we need to write the DSCP to + * priority mapping table. + */ + reg += dscp / per_reg; + ret = ksz_read8(dev, reg, &data); + if (ret) + return ret; + + shift = (dscp % per_reg) * (8 / per_reg); + + return (data >> shift) & mask; +} + +/** + * ksz_set_global_dscp_entry - Sets the global DSCP-to-priority mapping entry + * @dev: Pointer to the KSZ switch device structure + * @dscp: DSCP value for which to set the priority + * @ipm: Priority value to set + * + * This function sets the global DSCP-to-priority mapping entry for the + * specified DSCP value. + * + * Return: 0 on success, or a negative error code on failure. + */ +static int ksz_set_global_dscp_entry(struct ksz_device *dev, u8 dscp, u8 ipm) +{ + int reg, per_reg, shift; + u8 mask; + + ksz_get_dscp_prio_reg(dev, ®, &per_reg, &mask); + + shift = (dscp % per_reg) * (8 / per_reg); + + return ksz_rmw8(dev, reg + (dscp / per_reg), mask << shift, + ipm << shift); +} + +/** + * ksz_init_global_dscp_map - Initializes the global DSCP-to-priority mapping + * @dev: Pointer to the KSZ switch device structure + * + * This function initializes the global DSCP-to-priority mapping table for the + * switch. + * + * Return: 0 on success, or a negative error code on failure + */ +static int ksz_init_global_dscp_map(struct ksz_device *dev) +{ + int ret, dscp; + + /* On KSZ9xxx variants, DSCP remapping is disabled by default. + * Enable to have, predictable and reproducible behavior across + * different devices. + */ + if (!is_ksz8(dev)) { + ret = ksz_rmw8(dev, KSZ9477_REG_SW_MAC_TOS_CTRL, + KSZ9477_SW_TOS_DSCP_REMAP, + KSZ9477_SW_TOS_DSCP_REMAP); + if (ret) + return ret; + } + + for (dscp = 0; dscp < DSCP_MAX; dscp++) { + int ipm, tt; + + /* Map DSCP to Traffic Type, which is corresponding to the + * Internal Priority Map (IPM) in the switch. + */ + if (!is_ksz8(dev)) { + ipm = ietf_dscp_to_ieee8021q_tt(dscp); + } else { + /* On KSZ8xxx variants we do not have IPM to queue + * remapping table. We need to convert DSCP to Traffic + * Type and then to queue. + */ + tt = ietf_dscp_to_ieee8021q_tt(dscp); + if (tt < 0) + return tt; + + ipm = ieee8021q_tt_to_tc(tt, dev->info->num_tx_queues); + } + + if (ipm < 0) + return ipm; + + ret = ksz_set_global_dscp_entry(dev, dscp, ipm); + } + + return 0; +} + +/** + * ksz_port_add_dscp_prio - Adds a DSCP-to-priority mapping entry for a port on + * a KSZ switch. + * @ds: Pointer to the DSA switch structure + * @port: Port number for which to add the DSCP-to-priority mapping entry + * @dscp: DSCP value for which to add the priority + * @prio: Priority value to set + * + * Return: 0 on success, or a negative error code on failure + */ +int ksz_port_add_dscp_prio(struct dsa_switch *ds, int port, u8 dscp, u8 prio) +{ + struct ksz_device *dev = ds->priv; + + if (prio >= dev->info->num_ipms) + return -ERANGE; + + return ksz_set_global_dscp_entry(dev, dscp, prio); +} + +/** + * ksz_port_del_dscp_prio - Deletes a DSCP-to-priority mapping entry for a port + * on a KSZ switch. + * @ds: Pointer to the DSA switch structure + * @port: Port number for which to delete the DSCP-to-priority mapping entry + * @dscp: DSCP value for which to delete the priority + * @prio: Priority value to delete + * + * Return: 0 on success, or a negative error code on failure + */ +int ksz_port_del_dscp_prio(struct dsa_switch *ds, int port, u8 dscp, u8 prio) +{ + struct ksz_device *dev = ds->priv; + int ipm; + + if (ksz_port_get_dscp_prio(ds, port, dscp) != prio) + return 0; + + if (is_ksz8(dev)) { + ipm = ieee8021q_tt_to_tc(IEEE8021Q_TT_BE, + dev->info->num_tx_queues); + if (ipm < 0) + return ipm; + } else { + ipm = IEEE8021Q_TT_BE; + } + + return ksz_set_global_dscp_entry(dev, dscp, ipm); +} + +/** + * ksz_apptrust_error - Prints an error message for an invalid apptrust selector + * @dev: Pointer to the KSZ switch device structure + * + * This function prints an error message when an invalid apptrust selector is + * provided. + */ +static void ksz_apptrust_error(struct ksz_device *dev) +{ + char supported_apptrust_variants[64]; + int i; + + supported_apptrust_variants[0] = '\0'; + for (i = 0; i < ARRAY_SIZE(ksz_supported_apptrust_variants); i++) { + if (i > 0) + strlcat(supported_apptrust_variants, ", ", + sizeof(supported_apptrust_variants)); + strlcat(supported_apptrust_variants, + ksz_supported_apptrust_variants[i], + sizeof(supported_apptrust_variants)); + } + + dev_err(dev->dev, "Invalid apptrust selector or priority order. Supported: %s\n", + supported_apptrust_variants); +} + +/** + * ksz_port_set_apptrust_validate - Validates the apptrust selectors + * @dev: Pointer to the KSZ switch device structure + * @port: Port number for which to set the apptrust selectors + * @sel: Array of apptrust selectors to validate + * @nsel: Number of apptrust selectors in the array + * + * This function validates the apptrust selectors provided and ensures that + * they are in the correct order. + * + * This family of switches supports two apptrust selectors: DCB_APP_SEL_PCP and + * IEEE_8021QAZ_APP_SEL_DSCP. The priority order of the selectors is fixed and + * cannot be changed. The order is as follows: + * 1. DCB_APP_SEL_PCP - Priority Code Point selector (highest priority) + * 2. IEEE_8021QAZ_APP_SEL_DSCP - Differentiated Services Code Point selector + * (lowest priority) + * + * Return: 0 on success, or a negative error code on failure + */ +static int ksz_port_set_apptrust_validate(struct ksz_device *dev, int port, + const u8 *sel, int nsel) +{ + int i, j, found; + int j_prev = 0; + + /* Iterate through the requested selectors */ + for (i = 0; i < nsel; i++) { + found = 0; + + /* Check if the current selector is supported by the hardware */ + for (j = 0; j < sizeof(ksz_supported_apptrust); j++) { + if (sel[i] != ksz_supported_apptrust[j]) + continue; + + found = 1; + + /* Ensure that no higher priority selector (lower index) + * precedes a lower priority one + */ + if (i > 0 && j <= j_prev) + goto err_sel_not_vaild; + + j_prev = j; + break; + } + + if (!found) + goto err_sel_not_vaild; + } + + return 0; + +err_sel_not_vaild: + ksz_apptrust_error(dev); + + return -EINVAL; +} + +/** + * ksz88x3_port1_apptrust_quirk - Quirk for apptrust configuration on Port 1 + * of KSZ88x3 devices + * @dev: Pointer to the KSZ switch device structure + * @port: Port number for which to set the apptrust selectors + * @reg: Register address for the apptrust configuration + * @port1_data: Data to set for the apptrust configuration + * + * This function implements a quirk for apptrust configuration on Port 1 of + * KSZ88x3 devices. It ensures that apptrust configuration on Port 1 is not + * possible if PCP apptrust on Port 2 is disabled. This is because the Port 2 + * seems to be permanently hardwired to PCP classification, so we need to + * do Port 1 configuration always in agreement with Port 2 configuration. + * + * Return: 0 on success, or a negative error code on failure + */ +static int ksz88x3_port1_apptrust_quirk(struct ksz_device *dev, int port, + int reg, u8 port1_data) +{ + u8 port2_data; + int ret; + + /* If no apptrust is requested for Port 1, no need to care about Port 2 + * configuration. + */ + if (!(port1_data & (KSZ8_PORT_802_1P_ENABLE | KSZ8_PORT_DIFFSERV_ENABLE))) + return 0; + + /* We got request to enable any apptrust on Port 1. To make it possible, + * we need to enable multiple queues on the switch. If we enable + * multiqueue support, PCP classification on Port 2 will be + * automatically activated by HW. + */ + ret = ksz_pread8(dev, KSZ_PORT_2, reg, &port2_data); + if (ret) + return ret; + + /* If KSZ8_PORT_802_1P_ENABLE bit is set on Port 2, the driver showed + * the interest in PCP classification on Port 2. In this case, + * multiqueue support is enabled and we can enable any apptrust on + * Port 1. + * If KSZ8_PORT_802_1P_ENABLE bit is not set on Port 2, the PCP + * classification on Port 2 is still active, but the driver disabled + * multiqueue support and made frame prioritization inactive for + * all ports. In this case, we can't enable any apptrust on Port 1. + */ + if (!(port2_data & KSZ8_PORT_802_1P_ENABLE)) { + dev_err(dev->dev, "Not possible to enable any apptrust on Port 1 if PCP apptrust on Port 2 is disabled\n"); + return -EINVAL; + } + + return 0; +} + +/** + * ksz88x3_port2_apptrust_quirk - Quirk for apptrust configuration on Port 2 + * of KSZ88x3 devices + * @dev: Pointer to the KSZ switch device structure + * @port: Port number for which to set the apptrust selectors + * @reg: Register address for the apptrust configuration + * @port2_data: Data to set for the apptrust configuration + * + * This function implements a quirk for apptrust configuration on Port 2 of + * KSZ88x3 devices. It ensures that DSCP apptrust is not working on Port 2 and + * that it is not possible to disable PCP on Port 2. The only way to disable PCP + * on Port 2 is to disable multiple queues on the switch. + * + * Return: 0 on success, or a negative error code on failure + */ +static int ksz88x3_port2_apptrust_quirk(struct ksz_device *dev, int port, + int reg, u8 port2_data) +{ + struct dsa_switch *ds = dev->ds; + u8 port1_data; + int ret; + + /* First validate Port 2 configuration. DiffServ/DSCP is not working + * on this port. + */ + if (port2_data & KSZ8_PORT_DIFFSERV_ENABLE) { + dev_err(dev->dev, "DSCP apptrust is not working on Port 2\n"); + return -EINVAL; + } + + /* If PCP support is requested, we need to enable all queues on the + * switch to make PCP priority working on Port 2. + */ + if (port2_data & KSZ8_PORT_802_1P_ENABLE) + return ksz8_all_queues_split(dev, dev->info->num_tx_queues); + + /* We got request to disable PCP priority on Port 2. + * Now, we need to compare Port 2 configuration with Port 1 + * configuration. + */ + ret = ksz_pread8(dev, KSZ_PORT_1, reg, &port1_data); + if (ret) + return ret; + + /* If Port 1 has any apptrust enabled, we can't disable multiple queues + * on the switch, so we can't disable PCP on Port 2. + */ + if (port1_data & (KSZ8_PORT_802_1P_ENABLE | KSZ8_PORT_DIFFSERV_ENABLE)) { + dev_err(dev->dev, "Not possible to disable PCP on Port 2 if any apptrust is enabled on Port 1\n"); + return -EINVAL; + } + + /* Now we need to ensure that default priority on Port 1 is set to 0 + * otherwise we can't disable multiqueue support on the switch. + */ + ret = ksz_port_get_default_prio(ds, KSZ_PORT_1); + if (ret < 0) { + return ret; + } else if (ret) { + dev_err(dev->dev, "Not possible to disable PCP on Port 2 if non zero default priority is set on Port 1\n"); + return -EINVAL; + } + + /* Port 1 has no apptrust or default priority set and we got request to + * disable PCP on Port 2. We can disable multiqueue support to disable + * PCP on Port 2. + */ + return ksz8_all_queues_split(dev, 1); +} + +/** + * ksz88x3_port_apptrust_quirk - Quirk for apptrust configuration on KSZ88x3 + * devices + * @dev: Pointer to the KSZ switch device structure + * @port: Port number for which to set the apptrust selectors + * @reg: Register address for the apptrust configuration + * @data: Data to set for the apptrust configuration + * + * This function implements a quirk for apptrust configuration on KSZ88x3 + * devices. It ensures that apptrust configuration on Port 1 and + * Port 2 is done in agreement with each other. + * + * Return: 0 on success, or a negative error code on failure + */ +static int ksz88x3_port_apptrust_quirk(struct ksz_device *dev, int port, + int reg, u8 data) +{ + if (port == KSZ_PORT_1) + return ksz88x3_port1_apptrust_quirk(dev, port, reg, data); + else if (port == KSZ_PORT_2) + return ksz88x3_port2_apptrust_quirk(dev, port, reg, data); + + return 0; +} + +/** + * ksz_port_set_apptrust - Sets the apptrust selectors for a port on a KSZ + * switch + * @ds: Pointer to the DSA switch structure + * @port: Port number for which to set the apptrust selectors + * @sel: Array of apptrust selectors to set + * @nsel: Number of apptrust selectors in the array + * + * This function sets the apptrust selectors for the specified port on a KSZ + * switch. + * + * Return: 0 on success, or a negative error code on failure + */ +int ksz_port_set_apptrust(struct dsa_switch *ds, int port, + const u8 *sel, int nsel) +{ + const struct ksz_apptrust_map *map; + struct ksz_device *dev = ds->priv; + int reg, i, ret; + u8 data = 0; + u8 mask; + + ret = ksz_port_set_apptrust_validate(dev, port, sel, nsel); + if (ret) + return ret; + + ksz_get_apptrust_map_and_reg(dev, &map, ®, &mask); + + for (i = 0; i < nsel; i++) { + int j; + + for (j = 0; j < ARRAY_SIZE(ksz_supported_apptrust); j++) { + if (sel[i] != ksz_supported_apptrust[j]) + continue; + + data |= map[j].bit; + break; + } + } + + if (ksz_is_ksz88x3(dev)) { + ret = ksz88x3_port_apptrust_quirk(dev, port, reg, data); + if (ret) + return ret; + } + + return ksz_prmw8(dev, port, reg, mask, data); +} + +/** + * ksz_port_get_apptrust - Retrieves the apptrust selectors for a port on a KSZ + * switch + * @ds: Pointer to the DSA switch structure + * @port: Port number for which to get the apptrust selectors + * @sel: Array to store the apptrust selectors + * @nsel: Number of apptrust selectors in the array + * + * This function fetches the apptrust selectors for the specified port on a KSZ + * switch. + * + * Return: 0 on success, or a negative error code on failure + */ +int ksz_port_get_apptrust(struct dsa_switch *ds, int port, u8 *sel, int *nsel) +{ + const struct ksz_apptrust_map *map; + struct ksz_device *dev = ds->priv; + int reg, i, ret; + u8 data; + u8 mask; + + ksz_get_apptrust_map_and_reg(dev, &map, ®, &mask); + + ret = ksz_pread8(dev, port, reg, &data); + if (ret) + return ret; + + *nsel = 0; + for (i = 0; i < ARRAY_SIZE(ksz_supported_apptrust); i++) { + if (data & map[i].bit) + sel[(*nsel)++] = ksz_supported_apptrust[i]; + } + + return 0; +} + +/** + * ksz_dcb_init_port - Initializes the DCB configuration for a port on a KSZ + * @dev: Pointer to the KSZ switch device structure + * @port: Port number for which to initialize the DCB configuration + * + * This function initializes the DCB configuration for the specified port on a + * KSZ switch. Particular DCB configuration is set for the port, including the + * default priority and apptrust selectors. + * The default priority is set to Best Effort, and the apptrust selectors are + * set to all supported selectors. + * + * Return: 0 on success, or a negative error code on failure + */ +int ksz_dcb_init_port(struct ksz_device *dev, int port) +{ + const u8 ksz_default_apptrust[] = { DCB_APP_SEL_PCP }; + int ret, ipm; + + if (is_ksz8(dev)) { + ipm = ieee8021q_tt_to_tc(IEEE8021Q_TT_BE, + dev->info->num_tx_queues); + if (ipm < 0) + return ipm; + } else { + ipm = IEEE8021Q_TT_BE; + } + + /* Set the default priority for the port to Best Effort */ + ret = ksz_port_set_default_prio(dev->ds, port, ipm); + if (ret) + return ret; + + return ksz_port_set_apptrust(dev->ds, port, ksz_default_apptrust, + ARRAY_SIZE(ksz_default_apptrust)); +} + +/** + * ksz_dcb_init - Initializes the DCB configuration for a KSZ switch + * @dev: Pointer to the KSZ switch device structure + * + * This function initializes the DCB configuration for a KSZ switch. The global + * DSCP-to-priority mapping table is initialized. + * + * Return: 0 on success, or a negative error code on failure + */ +int ksz_dcb_init(struct ksz_device *dev) +{ + int ret; + + ret = ksz_init_global_dscp_map(dev); + if (ret) + return ret; + + /* Enable 802.1p priority control on Port 2 during switch initialization. + * This setup is critical for the apptrust functionality on Port 1, which + * relies on the priority settings of Port 2. Note: Port 1 is naturally + * configured before Port 2, necessitating this configuration order. + */ + if (ksz_is_ksz88x3(dev)) + return ksz_prmw8(dev, KSZ_PORT_2, KSZ8_REG_PORT_1_CTRL_0, + KSZ8_PORT_802_1P_ENABLE, + KSZ8_PORT_802_1P_ENABLE); + + return 0; +} |