/* * drivers/net/ethernet/mellanox/mlxsw/core.c * Copyright (c) 2015 Mellanox Technologies. All rights reserved. * Copyright (c) 2015 Jiri Pirko * Copyright (c) 2015 Ido Schimmel * Copyright (c) 2015 Elad Raz * * 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 #include #include #include #include #include #include #include #include #include #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 "); MODULE_DESCRIPTION("Mellanox switch device core driver");