diff options
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlxsw/core.c')
-rw-r--r-- | drivers/net/ethernet/mellanox/mlxsw/core.c | 550 |
1 files changed, 550 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c new file mode 100644 index 000000000000..a4bb94bf7a44 --- /dev/null +++ b/drivers/net/ethernet/mellanox/mlxsw/core.c @@ -0,0 +1,550 @@ +/* + * drivers/net/ethernet/mellanox/mlxsw/core.c + * Copyright (c) 2015 Mellanox Technologies. All rights reserved. + * Copyright (c) 2015 Jiri Pirko <jiri@mellanox.com> + * Copyright (c) 2015 Ido Schimmel <idosch@mellanox.com> + * Copyright (c) 2015 Elad Raz <eladr@mellanox.com> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the names of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/export.h> +#include <linux/err.h> +#include <linux/if_link.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> +#include <linux/u64_stats_sync.h> +#include <linux/netdevice.h> + +#include "core.h" +#include "item.h" +#include "cmd.h" +#include "port.h" +#include "trap.h" + +static LIST_HEAD(mlxsw_core_driver_list); +static DEFINE_SPINLOCK(mlxsw_core_driver_list_lock); + +static const char mlxsw_core_driver_name[] = "mlxsw_core"; + +static struct dentry *mlxsw_core_dbg_root; + +struct mlxsw_core_pcpu_stats { + u64 trap_rx_packets[MLXSW_TRAP_ID_MAX]; + u64 trap_rx_bytes[MLXSW_TRAP_ID_MAX]; + u64 port_rx_packets[MLXSW_PORT_MAX_PORTS]; + u64 port_rx_bytes[MLXSW_PORT_MAX_PORTS]; + struct u64_stats_sync syncp; + u32 trap_rx_dropped[MLXSW_TRAP_ID_MAX]; + u32 port_rx_dropped[MLXSW_PORT_MAX_PORTS]; + u32 trap_rx_invalid; + u32 port_rx_invalid; +}; + +struct mlxsw_core { + struct mlxsw_driver *driver; + const struct mlxsw_bus *bus; + void *bus_priv; + const struct mlxsw_bus_info *bus_info; + struct list_head rx_listener_list; + struct mlxsw_core_pcpu_stats __percpu *pcpu_stats; + struct dentry *dbg_dir; + struct { + struct debugfs_blob_wrapper vsd_blob; + struct debugfs_blob_wrapper psid_blob; + } dbg; + unsigned long driver_priv[0]; + /* driver_priv has to be always the last item */ +}; + +struct mlxsw_rx_listener_item { + struct list_head list; + struct mlxsw_rx_listener rxl; + void *priv; +}; + +/***************** + * Core functions + *****************/ + +static int mlxsw_core_rx_stats_dbg_read(struct seq_file *file, void *data) +{ + struct mlxsw_core *mlxsw_core = file->private; + struct mlxsw_core_pcpu_stats *p; + u64 rx_packets, rx_bytes; + u64 tmp_rx_packets, tmp_rx_bytes; + u32 rx_dropped, rx_invalid; + unsigned int start; + int i; + int j; + static const char hdr[] = + " NUM RX_PACKETS RX_BYTES RX_DROPPED\n"; + + seq_printf(file, hdr); + for (i = 0; i < MLXSW_TRAP_ID_MAX; i++) { + rx_packets = 0; + rx_bytes = 0; + rx_dropped = 0; + for_each_possible_cpu(j) { + p = per_cpu_ptr(mlxsw_core->pcpu_stats, j); + do { + start = u64_stats_fetch_begin(&p->syncp); + tmp_rx_packets = p->trap_rx_packets[i]; + tmp_rx_bytes = p->trap_rx_bytes[i]; + } while (u64_stats_fetch_retry(&p->syncp, start)); + + rx_packets += tmp_rx_packets; + rx_bytes += tmp_rx_bytes; + rx_dropped += p->trap_rx_dropped[i]; + } + seq_printf(file, "trap %3d %12llu %12llu %10u\n", + i, rx_packets, rx_bytes, rx_dropped); + } + rx_invalid = 0; + for_each_possible_cpu(j) { + p = per_cpu_ptr(mlxsw_core->pcpu_stats, j); + rx_invalid += p->trap_rx_invalid; + } + seq_printf(file, "trap INV %10u\n", + rx_invalid); + + for (i = 0; i < MLXSW_PORT_MAX_PORTS; i++) { + rx_packets = 0; + rx_bytes = 0; + rx_dropped = 0; + for_each_possible_cpu(j) { + p = per_cpu_ptr(mlxsw_core->pcpu_stats, j); + do { + start = u64_stats_fetch_begin(&p->syncp); + tmp_rx_packets = p->port_rx_packets[i]; + tmp_rx_bytes = p->port_rx_bytes[i]; + } while (u64_stats_fetch_retry(&p->syncp, start)); + + rx_packets += tmp_rx_packets; + rx_bytes += tmp_rx_bytes; + rx_dropped += p->port_rx_dropped[i]; + } + seq_printf(file, "port %3d %12llu %12llu %10u\n", + i, rx_packets, rx_bytes, rx_dropped); + } + rx_invalid = 0; + for_each_possible_cpu(j) { + p = per_cpu_ptr(mlxsw_core->pcpu_stats, j); + rx_invalid += p->port_rx_invalid; + } + seq_printf(file, "port INV %10u\n", + rx_invalid); + return 0; +} + +static int mlxsw_core_rx_stats_dbg_open(struct inode *inode, struct file *f) +{ + struct mlxsw_core *mlxsw_core = inode->i_private; + + return single_open(f, mlxsw_core_rx_stats_dbg_read, mlxsw_core); +} + +static const struct file_operations mlxsw_core_rx_stats_dbg_ops = { + .owner = THIS_MODULE, + .open = mlxsw_core_rx_stats_dbg_open, + .release = single_release, + .read = seq_read, + .llseek = seq_lseek +}; + +static void mlxsw_core_buf_dump_dbg(struct mlxsw_core *mlxsw_core, + const char *buf, size_t size) +{ + __be32 *m = (__be32 *) buf; + int i; + int count = size / sizeof(__be32); + + for (i = count - 1; i >= 0; i--) + if (m[i]) + break; + i++; + count = i ? i : 1; + for (i = 0; i < count; i += 4) + dev_dbg(mlxsw_core->bus_info->dev, "%04x - %08x %08x %08x %08x\n", + i * 4, be32_to_cpu(m[i]), be32_to_cpu(m[i + 1]), + be32_to_cpu(m[i + 2]), be32_to_cpu(m[i + 3])); +} + +int mlxsw_core_driver_register(struct mlxsw_driver *mlxsw_driver) +{ + spin_lock(&mlxsw_core_driver_list_lock); + list_add_tail(&mlxsw_driver->list, &mlxsw_core_driver_list); + spin_unlock(&mlxsw_core_driver_list_lock); + return 0; +} +EXPORT_SYMBOL(mlxsw_core_driver_register); + +void mlxsw_core_driver_unregister(struct mlxsw_driver *mlxsw_driver) +{ + spin_lock(&mlxsw_core_driver_list_lock); + list_del(&mlxsw_driver->list); + spin_unlock(&mlxsw_core_driver_list_lock); +} +EXPORT_SYMBOL(mlxsw_core_driver_unregister); + +static struct mlxsw_driver *__driver_find(const char *kind) +{ + struct mlxsw_driver *mlxsw_driver; + + list_for_each_entry(mlxsw_driver, &mlxsw_core_driver_list, list) { + if (strcmp(mlxsw_driver->kind, kind) == 0) + return mlxsw_driver; + } + return NULL; +} + +static struct mlxsw_driver *mlxsw_core_driver_get(const char *kind) +{ + struct mlxsw_driver *mlxsw_driver; + + spin_lock(&mlxsw_core_driver_list_lock); + mlxsw_driver = __driver_find(kind); + if (!mlxsw_driver) { + spin_unlock(&mlxsw_core_driver_list_lock); + request_module(MLXSW_MODULE_ALIAS_PREFIX "%s", kind); + spin_lock(&mlxsw_core_driver_list_lock); + mlxsw_driver = __driver_find(kind); + } + if (mlxsw_driver) { + if (!try_module_get(mlxsw_driver->owner)) + mlxsw_driver = NULL; + } + + spin_unlock(&mlxsw_core_driver_list_lock); + return mlxsw_driver; +} + +static void mlxsw_core_driver_put(const char *kind) +{ + struct mlxsw_driver *mlxsw_driver; + + spin_lock(&mlxsw_core_driver_list_lock); + mlxsw_driver = __driver_find(kind); + spin_unlock(&mlxsw_core_driver_list_lock); + if (!mlxsw_driver) + return; + module_put(mlxsw_driver->owner); +} + +static int mlxsw_core_debugfs_init(struct mlxsw_core *mlxsw_core) +{ + const struct mlxsw_bus_info *bus_info = mlxsw_core->bus_info; + + mlxsw_core->dbg_dir = debugfs_create_dir(bus_info->device_name, + mlxsw_core_dbg_root); + if (!mlxsw_core->dbg_dir) + return -ENOMEM; + debugfs_create_file("rx_stats", S_IRUGO, mlxsw_core->dbg_dir, + mlxsw_core, &mlxsw_core_rx_stats_dbg_ops); + mlxsw_core->dbg.vsd_blob.data = (void *) &bus_info->vsd; + mlxsw_core->dbg.vsd_blob.size = sizeof(bus_info->vsd); + debugfs_create_blob("vsd", S_IRUGO, mlxsw_core->dbg_dir, + &mlxsw_core->dbg.vsd_blob); + mlxsw_core->dbg.psid_blob.data = (void *) &bus_info->psid; + mlxsw_core->dbg.psid_blob.size = sizeof(bus_info->psid); + debugfs_create_blob("psid", S_IRUGO, mlxsw_core->dbg_dir, + &mlxsw_core->dbg.psid_blob); + return 0; +} + +static void mlxsw_core_debugfs_fini(struct mlxsw_core *mlxsw_core) +{ + debugfs_remove_recursive(mlxsw_core->dbg_dir); +} + +int mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info, + const struct mlxsw_bus *mlxsw_bus, + void *bus_priv) +{ + const char *device_kind = mlxsw_bus_info->device_kind; + struct mlxsw_core *mlxsw_core; + struct mlxsw_driver *mlxsw_driver; + size_t alloc_size; + int err; + + mlxsw_driver = mlxsw_core_driver_get(device_kind); + if (!mlxsw_driver) + return -EINVAL; + alloc_size = sizeof(*mlxsw_core) + mlxsw_driver->priv_size; + mlxsw_core = kzalloc(alloc_size, GFP_KERNEL); + if (!mlxsw_core) { + err = -ENOMEM; + goto err_core_alloc; + } + + INIT_LIST_HEAD(&mlxsw_core->rx_listener_list); + mlxsw_core->driver = mlxsw_driver; + mlxsw_core->bus = mlxsw_bus; + mlxsw_core->bus_priv = bus_priv; + mlxsw_core->bus_info = mlxsw_bus_info; + + mlxsw_core->pcpu_stats = + netdev_alloc_pcpu_stats(struct mlxsw_core_pcpu_stats); + if (!mlxsw_core->pcpu_stats) { + err = -ENOMEM; + goto err_alloc_stats; + } + err = mlxsw_bus->init(bus_priv, mlxsw_core, mlxsw_driver->profile); + if (err) + goto err_bus_init; + + err = mlxsw_driver->init(mlxsw_core->driver_priv, mlxsw_core, + mlxsw_bus_info); + if (err) + goto err_driver_init; + + err = mlxsw_core_debugfs_init(mlxsw_core); + if (err) + goto err_debugfs_init; + + return 0; + +err_debugfs_init: + mlxsw_core->driver->fini(mlxsw_core->driver_priv); +err_driver_init: + mlxsw_bus->fini(bus_priv); +err_bus_init: + free_percpu(mlxsw_core->pcpu_stats); +err_alloc_stats: + kfree(mlxsw_core); +err_core_alloc: + mlxsw_core_driver_put(device_kind); + return err; +} +EXPORT_SYMBOL(mlxsw_core_bus_device_register); + +void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core) +{ + const char *device_kind = mlxsw_core->bus_info->device_kind; + + mlxsw_core_debugfs_fini(mlxsw_core); + mlxsw_core->driver->fini(mlxsw_core->driver_priv); + mlxsw_core->bus->fini(mlxsw_core->bus_priv); + free_percpu(mlxsw_core->pcpu_stats); + kfree(mlxsw_core); + mlxsw_core_driver_put(device_kind); +} +EXPORT_SYMBOL(mlxsw_core_bus_device_unregister); + +static struct mlxsw_core *__mlxsw_core_get(void *driver_priv) +{ + return container_of(driver_priv, struct mlxsw_core, driver_priv); +} + +int mlxsw_core_skb_transmit(void *driver_priv, struct sk_buff *skb, + const struct mlxsw_tx_info *tx_info) +{ + struct mlxsw_core *mlxsw_core = __mlxsw_core_get(driver_priv); + + return mlxsw_core->bus->skb_transmit(mlxsw_core->bus_priv, skb, + tx_info); +} +EXPORT_SYMBOL(mlxsw_core_skb_transmit); + +static bool __is_rx_listener_equal(const struct mlxsw_rx_listener *rxl_a, + const struct mlxsw_rx_listener *rxl_b) +{ + return (rxl_a->func == rxl_b->func && + rxl_a->local_port == rxl_b->local_port && + rxl_a->trap_id == rxl_b->trap_id); +} + +static struct mlxsw_rx_listener_item * +__find_rx_listener_item(struct mlxsw_core *mlxsw_core, + const struct mlxsw_rx_listener *rxl, + void *priv) +{ + struct mlxsw_rx_listener_item *rxl_item; + + list_for_each_entry(rxl_item, &mlxsw_core->rx_listener_list, list) { + if (__is_rx_listener_equal(&rxl_item->rxl, rxl) && + rxl_item->priv == priv) + return rxl_item; + } + return NULL; +} + +int mlxsw_core_rx_listener_register(struct mlxsw_core *mlxsw_core, + const struct mlxsw_rx_listener *rxl, + void *priv) +{ + struct mlxsw_rx_listener_item *rxl_item; + + rxl_item = __find_rx_listener_item(mlxsw_core, rxl, priv); + if (rxl_item) + return -EEXIST; + rxl_item = kmalloc(sizeof(*rxl_item), GFP_KERNEL); + if (!rxl_item) + return -ENOMEM; + rxl_item->rxl = *rxl; + rxl_item->priv = priv; + + list_add_rcu(&rxl_item->list, &mlxsw_core->rx_listener_list); + return 0; +} +EXPORT_SYMBOL(mlxsw_core_rx_listener_register); + +void mlxsw_core_rx_listener_unregister(struct mlxsw_core *mlxsw_core, + const struct mlxsw_rx_listener *rxl, + void *priv) +{ + struct mlxsw_rx_listener_item *rxl_item; + + rxl_item = __find_rx_listener_item(mlxsw_core, rxl, priv); + if (!rxl_item) + return; + list_del_rcu(&rxl_item->list); + synchronize_rcu(); + kfree(rxl_item); +} +EXPORT_SYMBOL(mlxsw_core_rx_listener_unregister); + +void mlxsw_core_skb_receive(struct mlxsw_core *mlxsw_core, struct sk_buff *skb, + struct mlxsw_rx_info *rx_info) +{ + struct mlxsw_rx_listener_item *rxl_item; + const struct mlxsw_rx_listener *rxl; + struct mlxsw_core_pcpu_stats *pcpu_stats; + u8 local_port = rx_info->sys_port; + bool found = false; + + dev_dbg_ratelimited(mlxsw_core->bus_info->dev, "%s: sys_port = %d, trap_id = 0x%x\n", + __func__, rx_info->sys_port, rx_info->trap_id); + + if ((rx_info->trap_id >= MLXSW_TRAP_ID_MAX) || + (local_port >= MLXSW_PORT_MAX_PORTS)) + goto drop; + + rcu_read_lock(); + list_for_each_entry_rcu(rxl_item, &mlxsw_core->rx_listener_list, list) { + rxl = &rxl_item->rxl; + if ((rxl->local_port == MLXSW_PORT_DONT_CARE || + rxl->local_port == local_port) && + rxl->trap_id == rx_info->trap_id) { + found = true; + break; + } + } + rcu_read_unlock(); + if (!found) + goto drop; + + pcpu_stats = this_cpu_ptr(mlxsw_core->pcpu_stats); + u64_stats_update_begin(&pcpu_stats->syncp); + pcpu_stats->port_rx_packets[local_port]++; + pcpu_stats->port_rx_bytes[local_port] += skb->len; + pcpu_stats->trap_rx_packets[rx_info->trap_id]++; + pcpu_stats->trap_rx_bytes[rx_info->trap_id] += skb->len; + u64_stats_update_end(&pcpu_stats->syncp); + + rxl->func(skb, local_port, rxl_item->priv); + return; + +drop: + if (rx_info->trap_id >= MLXSW_TRAP_ID_MAX) + this_cpu_inc(mlxsw_core->pcpu_stats->trap_rx_invalid); + else + this_cpu_inc(mlxsw_core->pcpu_stats->trap_rx_dropped[rx_info->trap_id]); + if (local_port >= MLXSW_PORT_MAX_PORTS) + this_cpu_inc(mlxsw_core->pcpu_stats->port_rx_invalid); + else + this_cpu_inc(mlxsw_core->pcpu_stats->port_rx_dropped[local_port]); + dev_kfree_skb(skb); +} +EXPORT_SYMBOL(mlxsw_core_skb_receive); + +int mlxsw_cmd_exec(struct mlxsw_core *mlxsw_core, u16 opcode, u8 opcode_mod, + u32 in_mod, bool out_mbox_direct, + char *in_mbox, size_t in_mbox_size, + char *out_mbox, size_t out_mbox_size) +{ + u8 status; + int err; + + BUG_ON(in_mbox_size % sizeof(u32) || out_mbox_size % sizeof(u32)); + if (!mlxsw_core->bus->cmd_exec) + return -EOPNOTSUPP; + + dev_dbg(mlxsw_core->bus_info->dev, "Cmd exec (opcode=%x(%s),opcode_mod=%x,in_mod=%x)\n", + opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod, in_mod); + if (in_mbox) { + dev_dbg(mlxsw_core->bus_info->dev, "Input mailbox:\n"); + mlxsw_core_buf_dump_dbg(mlxsw_core, in_mbox, in_mbox_size); + } + + err = mlxsw_core->bus->cmd_exec(mlxsw_core->bus_priv, opcode, + opcode_mod, in_mod, out_mbox_direct, + in_mbox, in_mbox_size, + out_mbox, out_mbox_size, &status); + + if (err == -EIO && status != MLXSW_CMD_STATUS_OK) { + dev_err(mlxsw_core->bus_info->dev, "Cmd exec failed (opcode=%x(%s),opcode_mod=%x,in_mod=%x,status=%x(%s))\n", + opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod, + in_mod, status, mlxsw_cmd_status_str(status)); + } else if (err == -ETIMEDOUT) { + dev_err(mlxsw_core->bus_info->dev, "Cmd exec timed-out (opcode=%x(%s),opcode_mod=%x,in_mod=%x)\n", + opcode, mlxsw_cmd_opcode_str(opcode), opcode_mod, + in_mod); + } + + if (!err && out_mbox) { + dev_dbg(mlxsw_core->bus_info->dev, "Output mailbox:\n"); + mlxsw_core_buf_dump_dbg(mlxsw_core, out_mbox, out_mbox_size); + } + return err; +} +EXPORT_SYMBOL(mlxsw_cmd_exec); + +static int __init mlxsw_core_module_init(void) +{ + mlxsw_core_dbg_root = debugfs_create_dir(mlxsw_core_driver_name, NULL); + if (!mlxsw_core_dbg_root) + return -ENOMEM; + return 0; +} + +static void __exit mlxsw_core_module_exit(void) +{ + debugfs_remove_recursive(mlxsw_core_dbg_root); +} + +module_init(mlxsw_core_module_init); +module_exit(mlxsw_core_module_exit); + +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); +MODULE_DESCRIPTION("Mellanox switch device core driver"); |