diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/net/ethernet/ti/am65-cpsw-qos.c | 624 |
1 files changed, 624 insertions, 0 deletions
diff --git a/drivers/net/ethernet/ti/am65-cpsw-qos.c b/drivers/net/ethernet/ti/am65-cpsw-qos.c new file mode 100644 index 000000000..3bdd4dbcd --- /dev/null +++ b/drivers/net/ethernet/ti/am65-cpsw-qos.c @@ -0,0 +1,624 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Texas Instruments K3 AM65 Ethernet QoS submodule + * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/ + * + * quality of service module includes: + * Enhanced Scheduler Traffic (EST - P802.1Qbv/D2.2) + */ + +#include <linux/pm_runtime.h> +#include <linux/time.h> + +#include "am65-cpsw-nuss.h" +#include "am65-cpsw-qos.h" +#include "am65-cpts.h" + +#define AM65_CPSW_REG_CTL 0x004 +#define AM65_CPSW_PN_REG_CTL 0x004 +#define AM65_CPSW_PN_REG_FIFO_STATUS 0x050 +#define AM65_CPSW_PN_REG_EST_CTL 0x060 + +/* AM65_CPSW_REG_CTL register fields */ +#define AM65_CPSW_CTL_EST_EN BIT(18) + +/* AM65_CPSW_PN_REG_CTL register fields */ +#define AM65_CPSW_PN_CTL_EST_PORT_EN BIT(17) + +/* AM65_CPSW_PN_REG_EST_CTL register fields */ +#define AM65_CPSW_PN_EST_ONEBUF BIT(0) +#define AM65_CPSW_PN_EST_BUFSEL BIT(1) +#define AM65_CPSW_PN_EST_TS_EN BIT(2) +#define AM65_CPSW_PN_EST_TS_FIRST BIT(3) +#define AM65_CPSW_PN_EST_ONEPRI BIT(4) +#define AM65_CPSW_PN_EST_TS_PRI_MSK GENMASK(7, 5) + +/* AM65_CPSW_PN_REG_FIFO_STATUS register fields */ +#define AM65_CPSW_PN_FST_TX_PRI_ACTIVE_MSK GENMASK(7, 0) +#define AM65_CPSW_PN_FST_TX_E_MAC_ALLOW_MSK GENMASK(15, 8) +#define AM65_CPSW_PN_FST_EST_CNT_ERR BIT(16) +#define AM65_CPSW_PN_FST_EST_ADD_ERR BIT(17) +#define AM65_CPSW_PN_FST_EST_BUFACT BIT(18) + +/* EST FETCH COMMAND RAM */ +#define AM65_CPSW_FETCH_RAM_CMD_NUM 0x80 +#define AM65_CPSW_FETCH_CNT_MSK GENMASK(21, 8) +#define AM65_CPSW_FETCH_CNT_MAX (AM65_CPSW_FETCH_CNT_MSK >> 8) +#define AM65_CPSW_FETCH_CNT_OFFSET 8 +#define AM65_CPSW_FETCH_ALLOW_MSK GENMASK(7, 0) +#define AM65_CPSW_FETCH_ALLOW_MAX AM65_CPSW_FETCH_ALLOW_MSK + +enum timer_act { + TACT_PROG, /* need program timer */ + TACT_NEED_STOP, /* need stop first */ + TACT_SKIP_PROG, /* just buffer can be updated */ +}; + +static int am65_cpsw_port_est_enabled(struct am65_cpsw_port *port) +{ + return port->qos.est_oper || port->qos.est_admin; +} + +static void am65_cpsw_est_enable(struct am65_cpsw_common *common, int enable) +{ + u32 val; + + val = readl(common->cpsw_base + AM65_CPSW_REG_CTL); + + if (enable) + val |= AM65_CPSW_CTL_EST_EN; + else + val &= ~AM65_CPSW_CTL_EST_EN; + + writel(val, common->cpsw_base + AM65_CPSW_REG_CTL); + common->est_enabled = enable; +} + +static void am65_cpsw_port_est_enable(struct am65_cpsw_port *port, int enable) +{ + u32 val; + + val = readl(port->port_base + AM65_CPSW_PN_REG_CTL); + if (enable) + val |= AM65_CPSW_PN_CTL_EST_PORT_EN; + else + val &= ~AM65_CPSW_PN_CTL_EST_PORT_EN; + + writel(val, port->port_base + AM65_CPSW_PN_REG_CTL); +} + +/* target new EST RAM buffer, actual toggle happens after cycle completion */ +static void am65_cpsw_port_est_assign_buf_num(struct net_device *ndev, + int buf_num) +{ + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + u32 val; + + val = readl(port->port_base + AM65_CPSW_PN_REG_EST_CTL); + if (buf_num) + val |= AM65_CPSW_PN_EST_BUFSEL; + else + val &= ~AM65_CPSW_PN_EST_BUFSEL; + + writel(val, port->port_base + AM65_CPSW_PN_REG_EST_CTL); +} + +/* am65_cpsw_port_est_is_swapped() - Indicate if h/w is transitioned + * admin -> oper or not + * + * Return true if already transitioned. i.e oper is equal to admin and buf + * numbers match (est_oper->buf match with est_admin->buf). + * false if before transition. i.e oper is not equal to admin, (i.e a + * previous admin command is waiting to be transitioned to oper state + * and est_oper->buf not match with est_oper->buf). + */ +static int am65_cpsw_port_est_is_swapped(struct net_device *ndev, int *oper, + int *admin) +{ + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + u32 val; + + val = readl(port->port_base + AM65_CPSW_PN_REG_FIFO_STATUS); + *oper = !!(val & AM65_CPSW_PN_FST_EST_BUFACT); + + val = readl(port->port_base + AM65_CPSW_PN_REG_EST_CTL); + *admin = !!(val & AM65_CPSW_PN_EST_BUFSEL); + + return *admin == *oper; +} + +/* am65_cpsw_port_est_get_free_buf_num() - Get free buffer number for + * Admin to program the new schedule. + * + * Logic as follows:- + * If oper is same as admin, return the other buffer (!oper) as the admin + * buffer. If oper is not the same, driver let the current oper to continue + * as it is in the process of transitioning from admin -> oper. So keep the + * oper by selecting the same oper buffer by writing to EST_BUFSEL bit in + * EST CTL register. In the second iteration they will match and code returns. + * The actual buffer to write command is selected later before it is ready + * to update the schedule. + */ +static int am65_cpsw_port_est_get_free_buf_num(struct net_device *ndev) +{ + int oper, admin; + int roll = 2; + + while (roll--) { + if (am65_cpsw_port_est_is_swapped(ndev, &oper, &admin)) + return !oper; + + /* admin is not set, so hinder transition as it's not allowed + * to touch memory in-flight, by targeting same oper buf. + */ + am65_cpsw_port_est_assign_buf_num(ndev, oper); + + dev_info(&ndev->dev, + "Prev. EST admin cycle is in transit %d -> %d\n", + oper, admin); + } + + return admin; +} + +static void am65_cpsw_admin_to_oper(struct net_device *ndev) +{ + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + + if (port->qos.est_oper) + devm_kfree(&ndev->dev, port->qos.est_oper); + + port->qos.est_oper = port->qos.est_admin; + port->qos.est_admin = NULL; +} + +static void am65_cpsw_port_est_get_buf_num(struct net_device *ndev, + struct am65_cpsw_est *est_new) +{ + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + u32 val; + + val = readl(port->port_base + AM65_CPSW_PN_REG_EST_CTL); + val &= ~AM65_CPSW_PN_EST_ONEBUF; + writel(val, port->port_base + AM65_CPSW_PN_REG_EST_CTL); + + est_new->buf = am65_cpsw_port_est_get_free_buf_num(ndev); + + /* rolled buf num means changed buf while configuring */ + if (port->qos.est_oper && port->qos.est_admin && + est_new->buf == port->qos.est_oper->buf) + am65_cpsw_admin_to_oper(ndev); +} + +static void am65_cpsw_est_set(struct net_device *ndev, int enable) +{ + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + struct am65_cpsw_common *common = port->common; + int common_enable = 0; + int i; + + am65_cpsw_port_est_enable(port, enable); + + for (i = 0; i < common->port_num; i++) + common_enable |= am65_cpsw_port_est_enabled(&common->ports[i]); + + common_enable |= enable; + am65_cpsw_est_enable(common, common_enable); +} + +/* This update is supposed to be used in any routine before getting real state + * of admin -> oper transition, particularly it's supposed to be used in some + * generic routine for providing real state to Taprio Qdisc. + */ +static void am65_cpsw_est_update_state(struct net_device *ndev) +{ + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + int oper, admin; + + if (!port->qos.est_admin) + return; + + if (!am65_cpsw_port_est_is_swapped(ndev, &oper, &admin)) + return; + + am65_cpsw_admin_to_oper(ndev); +} + +/* Fetch command count it's number of bytes in Gigabit mode or nibbles in + * 10/100Mb mode. So, having speed and time in ns, recalculate ns to number of + * bytes/nibbles that can be sent while transmission on given speed. + */ +static int am65_est_cmd_ns_to_cnt(u64 ns, int link_speed) +{ + u64 temp; + + temp = ns * link_speed; + if (link_speed < SPEED_1000) + temp <<= 1; + + return DIV_ROUND_UP(temp, 8 * 1000); +} + +static void __iomem *am65_cpsw_est_set_sched_cmds(void __iomem *addr, + int fetch_cnt, + int fetch_allow) +{ + u32 prio_mask, cmd_fetch_cnt, cmd; + + do { + if (fetch_cnt > AM65_CPSW_FETCH_CNT_MAX) { + fetch_cnt -= AM65_CPSW_FETCH_CNT_MAX; + cmd_fetch_cnt = AM65_CPSW_FETCH_CNT_MAX; + } else { + cmd_fetch_cnt = fetch_cnt; + /* fetch count can't be less than 16? */ + if (cmd_fetch_cnt && cmd_fetch_cnt < 16) + cmd_fetch_cnt = 16; + + fetch_cnt = 0; + } + + prio_mask = fetch_allow & AM65_CPSW_FETCH_ALLOW_MSK; + cmd = (cmd_fetch_cnt << AM65_CPSW_FETCH_CNT_OFFSET) | prio_mask; + + writel(cmd, addr); + addr += 4; + } while (fetch_cnt); + + return addr; +} + +static int am65_cpsw_est_calc_cmd_num(struct net_device *ndev, + struct tc_taprio_qopt_offload *taprio, + int link_speed) +{ + int i, cmd_cnt, cmd_sum = 0; + u32 fetch_cnt; + + for (i = 0; i < taprio->num_entries; i++) { + if (taprio->entries[i].command != TC_TAPRIO_CMD_SET_GATES) { + dev_err(&ndev->dev, "Only SET command is supported"); + return -EINVAL; + } + + fetch_cnt = am65_est_cmd_ns_to_cnt(taprio->entries[i].interval, + link_speed); + + cmd_cnt = DIV_ROUND_UP(fetch_cnt, AM65_CPSW_FETCH_CNT_MAX); + if (!cmd_cnt) + cmd_cnt++; + + cmd_sum += cmd_cnt; + + if (!fetch_cnt) + break; + } + + return cmd_sum; +} + +static int am65_cpsw_est_check_scheds(struct net_device *ndev, + struct am65_cpsw_est *est_new) +{ + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + int cmd_num; + + cmd_num = am65_cpsw_est_calc_cmd_num(ndev, &est_new->taprio, + port->qos.link_speed); + if (cmd_num < 0) + return cmd_num; + + if (cmd_num > AM65_CPSW_FETCH_RAM_CMD_NUM / 2) { + dev_err(&ndev->dev, "No fetch RAM"); + return -ENOMEM; + } + + return 0; +} + +static void am65_cpsw_est_set_sched_list(struct net_device *ndev, + struct am65_cpsw_est *est_new) +{ + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + u32 fetch_cnt, fetch_allow, all_fetch_allow = 0; + void __iomem *ram_addr, *max_ram_addr; + struct tc_taprio_sched_entry *entry; + int i, ram_size; + + ram_addr = port->fetch_ram_base; + ram_size = AM65_CPSW_FETCH_RAM_CMD_NUM * 2; + ram_addr += est_new->buf * ram_size; + + max_ram_addr = ram_size + ram_addr; + for (i = 0; i < est_new->taprio.num_entries; i++) { + entry = &est_new->taprio.entries[i]; + + fetch_cnt = am65_est_cmd_ns_to_cnt(entry->interval, + port->qos.link_speed); + fetch_allow = entry->gate_mask; + if (fetch_allow > AM65_CPSW_FETCH_ALLOW_MAX) + dev_dbg(&ndev->dev, "fetch_allow > 8 bits: %d\n", + fetch_allow); + + ram_addr = am65_cpsw_est_set_sched_cmds(ram_addr, fetch_cnt, + fetch_allow); + + if (!fetch_cnt && i < est_new->taprio.num_entries - 1) { + dev_info(&ndev->dev, + "next scheds after %d have no impact", i + 1); + break; + } + + all_fetch_allow |= fetch_allow; + } + + /* end cmd, enabling non-timed queues for potential over cycle time */ + if (ram_addr < max_ram_addr) + writel(~all_fetch_allow & AM65_CPSW_FETCH_ALLOW_MSK, ram_addr); +} + +/** + * Enable ESTf periodic output, set cycle start time and interval. + */ +static int am65_cpsw_timer_set(struct net_device *ndev, + struct am65_cpsw_est *est_new) +{ + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + struct am65_cpsw_common *common = port->common; + struct am65_cpts *cpts = common->cpts; + struct am65_cpts_estf_cfg cfg; + + cfg.ns_period = est_new->taprio.cycle_time; + cfg.ns_start = est_new->taprio.base_time; + + return am65_cpts_estf_enable(cpts, port->port_id - 1, &cfg); +} + +static void am65_cpsw_timer_stop(struct net_device *ndev) +{ + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + struct am65_cpts *cpts = port->common->cpts; + + am65_cpts_estf_disable(cpts, port->port_id - 1); +} + +static enum timer_act am65_cpsw_timer_act(struct net_device *ndev, + struct am65_cpsw_est *est_new) +{ + struct tc_taprio_qopt_offload *taprio_oper, *taprio_new; + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + struct am65_cpts *cpts = port->common->cpts; + u64 cur_time; + s64 diff; + + if (!port->qos.est_oper) + return TACT_PROG; + + taprio_new = &est_new->taprio; + taprio_oper = &port->qos.est_oper->taprio; + + if (taprio_new->cycle_time != taprio_oper->cycle_time) + return TACT_NEED_STOP; + + /* in order to avoid timer reset get base_time form oper taprio */ + if (!taprio_new->base_time && taprio_oper) + taprio_new->base_time = taprio_oper->base_time; + + if (taprio_new->base_time == taprio_oper->base_time) + return TACT_SKIP_PROG; + + /* base times are cycle synchronized */ + diff = taprio_new->base_time - taprio_oper->base_time; + diff = diff < 0 ? -diff : diff; + if (diff % taprio_new->cycle_time) + return TACT_NEED_STOP; + + cur_time = am65_cpts_ns_gettime(cpts); + if (taprio_new->base_time <= cur_time + taprio_new->cycle_time) + return TACT_SKIP_PROG; + + /* TODO: Admin schedule at future time is not currently supported */ + return TACT_NEED_STOP; +} + +static void am65_cpsw_stop_est(struct net_device *ndev) +{ + am65_cpsw_est_set(ndev, 0); + am65_cpsw_timer_stop(ndev); +} + +static void am65_cpsw_purge_est(struct net_device *ndev) +{ + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + + am65_cpsw_stop_est(ndev); + + if (port->qos.est_admin) + devm_kfree(&ndev->dev, port->qos.est_admin); + + if (port->qos.est_oper) + devm_kfree(&ndev->dev, port->qos.est_oper); + + port->qos.est_oper = NULL; + port->qos.est_admin = NULL; +} + +static int am65_cpsw_configure_taprio(struct net_device *ndev, + struct am65_cpsw_est *est_new) +{ + struct am65_cpsw_common *common = am65_ndev_to_common(ndev); + struct am65_cpts *cpts = common->cpts; + int ret = 0, tact = TACT_PROG; + + am65_cpsw_est_update_state(ndev); + + if (!est_new->taprio.enable) { + am65_cpsw_stop_est(ndev); + return ret; + } + + ret = am65_cpsw_est_check_scheds(ndev, est_new); + if (ret < 0) + return ret; + + tact = am65_cpsw_timer_act(ndev, est_new); + if (tact == TACT_NEED_STOP) { + dev_err(&ndev->dev, + "Can't toggle estf timer, stop taprio first"); + return -EINVAL; + } + + if (tact == TACT_PROG) + am65_cpsw_timer_stop(ndev); + + if (!est_new->taprio.base_time) + est_new->taprio.base_time = am65_cpts_ns_gettime(cpts); + + am65_cpsw_port_est_get_buf_num(ndev, est_new); + am65_cpsw_est_set_sched_list(ndev, est_new); + am65_cpsw_port_est_assign_buf_num(ndev, est_new->buf); + + am65_cpsw_est_set(ndev, est_new->taprio.enable); + + if (tact == TACT_PROG) { + ret = am65_cpsw_timer_set(ndev, est_new); + if (ret) { + dev_err(&ndev->dev, "Failed to set cycle time"); + return ret; + } + } + + return ret; +} + +static void am65_cpsw_cp_taprio(struct tc_taprio_qopt_offload *from, + struct tc_taprio_qopt_offload *to) +{ + int i; + + *to = *from; + for (i = 0; i < from->num_entries; i++) + to->entries[i] = from->entries[i]; +} + +static int am65_cpsw_set_taprio(struct net_device *ndev, void *type_data) +{ + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + struct tc_taprio_qopt_offload *taprio = type_data; + struct am65_cpsw_est *est_new; + int ret = 0; + + if (taprio->cycle_time_extension) { + dev_err(&ndev->dev, "Failed to set cycle time extension"); + return -EOPNOTSUPP; + } + + est_new = devm_kzalloc(&ndev->dev, + struct_size(est_new, taprio.entries, taprio->num_entries), + GFP_KERNEL); + if (!est_new) + return -ENOMEM; + + am65_cpsw_cp_taprio(taprio, &est_new->taprio); + ret = am65_cpsw_configure_taprio(ndev, est_new); + if (!ret) { + if (taprio->enable) { + if (port->qos.est_admin) + devm_kfree(&ndev->dev, port->qos.est_admin); + + port->qos.est_admin = est_new; + } else { + devm_kfree(&ndev->dev, est_new); + am65_cpsw_purge_est(ndev); + } + } else { + devm_kfree(&ndev->dev, est_new); + } + + return ret; +} + +static void am65_cpsw_est_link_up(struct net_device *ndev, int link_speed) +{ + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + ktime_t cur_time; + s64 delta; + + port->qos.link_speed = link_speed; + if (!am65_cpsw_port_est_enabled(port)) + return; + + if (port->qos.link_down_time) { + cur_time = ktime_get(); + delta = ktime_us_delta(cur_time, port->qos.link_down_time); + if (delta > USEC_PER_SEC) { + dev_err(&ndev->dev, + "Link has been lost too long, stopping TAS"); + goto purge_est; + } + } + + return; + +purge_est: + am65_cpsw_purge_est(ndev); +} + +static int am65_cpsw_setup_taprio(struct net_device *ndev, void *type_data) +{ + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + struct am65_cpsw_common *common = port->common; + + if (!IS_ENABLED(CONFIG_TI_AM65_CPSW_TAS)) + return -ENODEV; + + if (!netif_running(ndev)) { + dev_err(&ndev->dev, "interface is down, link speed unknown\n"); + return -ENETDOWN; + } + + if (common->pf_p0_rx_ptype_rrobin) { + dev_err(&ndev->dev, + "p0-rx-ptype-rrobin flag conflicts with taprio qdisc\n"); + return -EINVAL; + } + + if (port->qos.link_speed == SPEED_UNKNOWN) + return -ENOLINK; + + return am65_cpsw_set_taprio(ndev, type_data); +} + +int am65_cpsw_qos_ndo_setup_tc(struct net_device *ndev, enum tc_setup_type type, + void *type_data) +{ + switch (type) { + case TC_SETUP_QDISC_TAPRIO: + return am65_cpsw_setup_taprio(ndev, type_data); + default: + return -EOPNOTSUPP; + } +} + +void am65_cpsw_qos_link_up(struct net_device *ndev, int link_speed) +{ + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + + if (!IS_ENABLED(CONFIG_TI_AM65_CPSW_TAS)) + return; + + am65_cpsw_est_link_up(ndev, link_speed); + port->qos.link_down_time = 0; +} + +void am65_cpsw_qos_link_down(struct net_device *ndev) +{ + struct am65_cpsw_port *port = am65_ndev_to_port(ndev); + + if (!IS_ENABLED(CONFIG_TI_AM65_CPSW_TAS)) + return; + + if (!port->qos.link_down_time) + port->qos.link_down_time = ktime_get(); + + port->qos.link_speed = SPEED_UNKNOWN; +} |