diff options
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlxsw/core.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlxsw/core.c | 736 |
1 files changed, 736 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c index a4bb94bf7a44..ad66ae44a0d7 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/core.c +++ b/drivers/net/ethernet/mellanox/mlxsw/core.c @@ -44,12 +44,27 @@ #include <linux/seq_file.h> #include <linux/u64_stats_sync.h> #include <linux/netdevice.h> +#include <linux/wait.h> +#include <linux/skbuff.h> +#include <linux/etherdevice.h> +#include <linux/types.h> +#include <linux/wait.h> +#include <linux/string.h> +#include <linux/gfp.h> +#include <linux/random.h> +#include <linux/jiffies.h> +#include <linux/mutex.h> +#include <linux/rcupdate.h> +#include <linux/slab.h> +#include <asm/byteorder.h> #include "core.h" #include "item.h" #include "cmd.h" #include "port.h" #include "trap.h" +#include "emad.h" +#include "reg.h" static LIST_HEAD(mlxsw_core_driver_list); static DEFINE_SPINLOCK(mlxsw_core_driver_list_lock); @@ -76,6 +91,15 @@ struct mlxsw_core { void *bus_priv; const struct mlxsw_bus_info *bus_info; struct list_head rx_listener_list; + struct list_head event_listener_list; + struct { + struct sk_buff *resp_skb; + u64 tid; + wait_queue_head_t wait; + bool trans_active; + struct mutex lock; /* One EMAD transaction at a time. */ + bool use_emad; + } emad; struct mlxsw_core_pcpu_stats __percpu *pcpu_stats; struct dentry *dbg_dir; struct { @@ -92,6 +116,473 @@ struct mlxsw_rx_listener_item { void *priv; }; +struct mlxsw_event_listener_item { + struct list_head list; + struct mlxsw_event_listener el; + void *priv; +}; + +/****************** + * EMAD processing + ******************/ + +/* emad_eth_hdr_dmac + * Destination MAC in EMAD's Ethernet header. + * Must be set to 01:02:c9:00:00:01 + */ +MLXSW_ITEM_BUF(emad, eth_hdr, dmac, 0x00, 6); + +/* emad_eth_hdr_smac + * Source MAC in EMAD's Ethernet header. + * Must be set to 00:02:c9:01:02:03 + */ +MLXSW_ITEM_BUF(emad, eth_hdr, smac, 0x06, 6); + +/* emad_eth_hdr_ethertype + * Ethertype in EMAD's Ethernet header. + * Must be set to 0x8932 + */ +MLXSW_ITEM32(emad, eth_hdr, ethertype, 0x0C, 16, 16); + +/* emad_eth_hdr_mlx_proto + * Mellanox protocol. + * Must be set to 0x0. + */ +MLXSW_ITEM32(emad, eth_hdr, mlx_proto, 0x0C, 8, 8); + +/* emad_eth_hdr_ver + * Mellanox protocol version. + * Must be set to 0x0. + */ +MLXSW_ITEM32(emad, eth_hdr, ver, 0x0C, 4, 4); + +/* emad_op_tlv_type + * Type of the TLV. + * Must be set to 0x1 (operation TLV). + */ +MLXSW_ITEM32(emad, op_tlv, type, 0x00, 27, 5); + +/* emad_op_tlv_len + * Length of the operation TLV in u32. + * Must be set to 0x4. + */ +MLXSW_ITEM32(emad, op_tlv, len, 0x00, 16, 11); + +/* emad_op_tlv_dr + * Direct route bit. Setting to 1 indicates the EMAD is a direct route + * EMAD. DR TLV must follow. + * + * Note: Currently not supported and must not be set. + */ +MLXSW_ITEM32(emad, op_tlv, dr, 0x00, 15, 1); + +/* emad_op_tlv_status + * Returned status in case of EMAD response. Must be set to 0 in case + * of EMAD request. + * 0x0 - success + * 0x1 - device is busy. Requester should retry + * 0x2 - Mellanox protocol version not supported + * 0x3 - unknown TLV + * 0x4 - register not supported + * 0x5 - operation class not supported + * 0x6 - EMAD method not supported + * 0x7 - bad parameter (e.g. port out of range) + * 0x8 - resource not available + * 0x9 - message receipt acknowledgment. Requester should retry + * 0x70 - internal error + */ +MLXSW_ITEM32(emad, op_tlv, status, 0x00, 8, 7); + +/* emad_op_tlv_register_id + * Register ID of register within register TLV. + */ +MLXSW_ITEM32(emad, op_tlv, register_id, 0x04, 16, 16); + +/* emad_op_tlv_r + * Response bit. Setting to 1 indicates Response, otherwise request. + */ +MLXSW_ITEM32(emad, op_tlv, r, 0x04, 15, 1); + +/* emad_op_tlv_method + * EMAD method type. + * 0x1 - query + * 0x2 - write + * 0x3 - send (currently not supported) + * 0x4 - event + */ +MLXSW_ITEM32(emad, op_tlv, method, 0x04, 8, 7); + +/* emad_op_tlv_class + * EMAD operation class. Must be set to 0x1 (REG_ACCESS). + */ +MLXSW_ITEM32(emad, op_tlv, class, 0x04, 0, 8); + +/* emad_op_tlv_tid + * EMAD transaction ID. Used for pairing request and response EMADs. + */ +MLXSW_ITEM64(emad, op_tlv, tid, 0x08, 0, 64); + +/* emad_reg_tlv_type + * Type of the TLV. + * Must be set to 0x3 (register TLV). + */ +MLXSW_ITEM32(emad, reg_tlv, type, 0x00, 27, 5); + +/* emad_reg_tlv_len + * Length of the operation TLV in u32. + */ +MLXSW_ITEM32(emad, reg_tlv, len, 0x00, 16, 11); + +/* emad_end_tlv_type + * Type of the TLV. + * Must be set to 0x0 (end TLV). + */ +MLXSW_ITEM32(emad, end_tlv, type, 0x00, 27, 5); + +/* emad_end_tlv_len + * Length of the end TLV in u32. + * Must be set to 1. + */ +MLXSW_ITEM32(emad, end_tlv, len, 0x00, 16, 11); + +enum mlxsw_core_reg_access_type { + MLXSW_CORE_REG_ACCESS_TYPE_QUERY, + MLXSW_CORE_REG_ACCESS_TYPE_WRITE, +}; + +static inline const char * +mlxsw_core_reg_access_type_str(enum mlxsw_core_reg_access_type type) +{ + switch (type) { + case MLXSW_CORE_REG_ACCESS_TYPE_QUERY: + return "query"; + case MLXSW_CORE_REG_ACCESS_TYPE_WRITE: + return "write"; + } + BUG(); +} + +static void mlxsw_emad_pack_end_tlv(char *end_tlv) +{ + mlxsw_emad_end_tlv_type_set(end_tlv, MLXSW_EMAD_TLV_TYPE_END); + mlxsw_emad_end_tlv_len_set(end_tlv, MLXSW_EMAD_END_TLV_LEN); +} + +static void mlxsw_emad_pack_reg_tlv(char *reg_tlv, + const struct mlxsw_reg_info *reg, + char *payload) +{ + mlxsw_emad_reg_tlv_type_set(reg_tlv, MLXSW_EMAD_TLV_TYPE_REG); + mlxsw_emad_reg_tlv_len_set(reg_tlv, reg->len / sizeof(u32) + 1); + memcpy(reg_tlv + sizeof(u32), payload, reg->len); +} + +static void mlxsw_emad_pack_op_tlv(char *op_tlv, + const struct mlxsw_reg_info *reg, + enum mlxsw_core_reg_access_type type, + struct mlxsw_core *mlxsw_core) +{ + mlxsw_emad_op_tlv_type_set(op_tlv, MLXSW_EMAD_TLV_TYPE_OP); + mlxsw_emad_op_tlv_len_set(op_tlv, MLXSW_EMAD_OP_TLV_LEN); + mlxsw_emad_op_tlv_dr_set(op_tlv, 0); + mlxsw_emad_op_tlv_status_set(op_tlv, 0); + mlxsw_emad_op_tlv_register_id_set(op_tlv, reg->id); + mlxsw_emad_op_tlv_r_set(op_tlv, MLXSW_EMAD_OP_TLV_REQUEST); + if (MLXSW_CORE_REG_ACCESS_TYPE_QUERY == type) + mlxsw_emad_op_tlv_method_set(op_tlv, + MLXSW_EMAD_OP_TLV_METHOD_QUERY); + else + mlxsw_emad_op_tlv_method_set(op_tlv, + MLXSW_EMAD_OP_TLV_METHOD_WRITE); + mlxsw_emad_op_tlv_class_set(op_tlv, + MLXSW_EMAD_OP_TLV_CLASS_REG_ACCESS); + mlxsw_emad_op_tlv_tid_set(op_tlv, mlxsw_core->emad.tid); +} + +static int mlxsw_emad_construct_eth_hdr(struct sk_buff *skb) +{ + char *eth_hdr = skb_push(skb, MLXSW_EMAD_ETH_HDR_LEN); + + mlxsw_emad_eth_hdr_dmac_memcpy_to(eth_hdr, MLXSW_EMAD_EH_DMAC); + mlxsw_emad_eth_hdr_smac_memcpy_to(eth_hdr, MLXSW_EMAD_EH_SMAC); + mlxsw_emad_eth_hdr_ethertype_set(eth_hdr, MLXSW_EMAD_EH_ETHERTYPE); + mlxsw_emad_eth_hdr_mlx_proto_set(eth_hdr, MLXSW_EMAD_EH_MLX_PROTO); + mlxsw_emad_eth_hdr_ver_set(eth_hdr, MLXSW_EMAD_EH_PROTO_VERSION); + + skb_reset_mac_header(skb); + + return 0; +} + +static void mlxsw_emad_construct(struct sk_buff *skb, + const struct mlxsw_reg_info *reg, + char *payload, + enum mlxsw_core_reg_access_type type, + struct mlxsw_core *mlxsw_core) +{ + char *buf; + + buf = skb_push(skb, MLXSW_EMAD_END_TLV_LEN * sizeof(u32)); + mlxsw_emad_pack_end_tlv(buf); + + buf = skb_push(skb, reg->len + sizeof(u32)); + mlxsw_emad_pack_reg_tlv(buf, reg, payload); + + buf = skb_push(skb, MLXSW_EMAD_OP_TLV_LEN * sizeof(u32)); + mlxsw_emad_pack_op_tlv(buf, reg, type, mlxsw_core); + + mlxsw_emad_construct_eth_hdr(skb); +} + +static char *mlxsw_emad_op_tlv(const struct sk_buff *skb) +{ + return ((char *) (skb->data + MLXSW_EMAD_ETH_HDR_LEN)); +} + +static char *mlxsw_emad_reg_tlv(const struct sk_buff *skb) +{ + return ((char *) (skb->data + MLXSW_EMAD_ETH_HDR_LEN + + MLXSW_EMAD_OP_TLV_LEN * sizeof(u32))); +} + +static char *mlxsw_emad_reg_payload(const char *op_tlv) +{ + return ((char *) (op_tlv + (MLXSW_EMAD_OP_TLV_LEN + 1) * sizeof(u32))); +} + +static u64 mlxsw_emad_get_tid(const struct sk_buff *skb) +{ + char *op_tlv; + + op_tlv = mlxsw_emad_op_tlv(skb); + return mlxsw_emad_op_tlv_tid_get(op_tlv); +} + +static bool mlxsw_emad_is_resp(const struct sk_buff *skb) +{ + char *op_tlv; + + op_tlv = mlxsw_emad_op_tlv(skb); + return (MLXSW_EMAD_OP_TLV_RESPONSE == mlxsw_emad_op_tlv_r_get(op_tlv)); +} + +#define MLXSW_EMAD_TIMEOUT_MS 200 + +static int __mlxsw_emad_transmit(struct mlxsw_core *mlxsw_core, + struct sk_buff *skb, + const struct mlxsw_tx_info *tx_info) +{ + int err; + int ret; + + err = mlxsw_core_skb_transmit(mlxsw_core->driver_priv, skb, tx_info); + if (err) { + dev_warn(mlxsw_core->bus_info->dev, "Failed to transmit EMAD (tid=%llx)\n", + mlxsw_core->emad.tid); + dev_kfree_skb(skb); + return err; + } + + mlxsw_core->emad.trans_active = true; + ret = wait_event_timeout(mlxsw_core->emad.wait, + !(mlxsw_core->emad.trans_active), + msecs_to_jiffies(MLXSW_EMAD_TIMEOUT_MS)); + if (!ret) { + dev_warn(mlxsw_core->bus_info->dev, "EMAD timed-out (tid=%llx)\n", + mlxsw_core->emad.tid); + mlxsw_core->emad.trans_active = false; + return -EIO; + } + + return 0; +} + +static int mlxsw_emad_process_status(struct mlxsw_core *mlxsw_core, + char *op_tlv) +{ + enum mlxsw_emad_op_tlv_status status; + u64 tid; + + status = mlxsw_emad_op_tlv_status_get(op_tlv); + tid = mlxsw_emad_op_tlv_tid_get(op_tlv); + + switch (status) { + case MLXSW_EMAD_OP_TLV_STATUS_SUCCESS: + return 0; + case MLXSW_EMAD_OP_TLV_STATUS_BUSY: + case MLXSW_EMAD_OP_TLV_STATUS_MESSAGE_RECEIPT_ACK: + dev_warn(mlxsw_core->bus_info->dev, "Reg access status again (tid=%llx,status=%x(%s))\n", + tid, status, mlxsw_emad_op_tlv_status_str(status)); + return -EAGAIN; + case MLXSW_EMAD_OP_TLV_STATUS_VERSION_NOT_SUPPORTED: + case MLXSW_EMAD_OP_TLV_STATUS_UNKNOWN_TLV: + case MLXSW_EMAD_OP_TLV_STATUS_REGISTER_NOT_SUPPORTED: + case MLXSW_EMAD_OP_TLV_STATUS_CLASS_NOT_SUPPORTED: + case MLXSW_EMAD_OP_TLV_STATUS_METHOD_NOT_SUPPORTED: + case MLXSW_EMAD_OP_TLV_STATUS_BAD_PARAMETER: + case MLXSW_EMAD_OP_TLV_STATUS_RESOURCE_NOT_AVAILABLE: + case MLXSW_EMAD_OP_TLV_STATUS_INTERNAL_ERROR: + default: + dev_err(mlxsw_core->bus_info->dev, "Reg access status failed (tid=%llx,status=%x(%s))\n", + tid, status, mlxsw_emad_op_tlv_status_str(status)); + return -EIO; + } +} + +static int mlxsw_emad_process_status_skb(struct mlxsw_core *mlxsw_core, + struct sk_buff *skb) +{ + return mlxsw_emad_process_status(mlxsw_core, mlxsw_emad_op_tlv(skb)); +} + +static int mlxsw_emad_transmit(struct mlxsw_core *mlxsw_core, + struct sk_buff *skb, + const struct mlxsw_tx_info *tx_info) +{ + struct sk_buff *trans_skb; + int n_retry; + int err; + + n_retry = 0; +retry: + /* We copy the EMAD to a new skb, since we might need + * to retransmit it in case of failure. + */ + trans_skb = skb_copy(skb, GFP_KERNEL); + if (!trans_skb) { + err = -ENOMEM; + goto out; + } + + err = __mlxsw_emad_transmit(mlxsw_core, trans_skb, tx_info); + if (!err) { + struct sk_buff *resp_skb = mlxsw_core->emad.resp_skb; + + err = mlxsw_emad_process_status_skb(mlxsw_core, resp_skb); + if (err) + dev_kfree_skb(resp_skb); + if (!err || err != -EAGAIN) + goto out; + } + if (n_retry++ < MLXSW_EMAD_MAX_RETRY) + goto retry; + +out: + dev_kfree_skb(skb); + mlxsw_core->emad.tid++; + return err; +} + +static void mlxsw_emad_rx_listener_func(struct sk_buff *skb, u8 local_port, + void *priv) +{ + struct mlxsw_core *mlxsw_core = priv; + + if (mlxsw_emad_is_resp(skb) && + mlxsw_core->emad.trans_active && + mlxsw_emad_get_tid(skb) == mlxsw_core->emad.tid) { + mlxsw_core->emad.resp_skb = skb; + mlxsw_core->emad.trans_active = false; + wake_up(&mlxsw_core->emad.wait); + } else { + dev_kfree_skb(skb); + } +} + +static const struct mlxsw_rx_listener mlxsw_emad_rx_listener = { + .func = mlxsw_emad_rx_listener_func, + .local_port = MLXSW_PORT_DONT_CARE, + .trap_id = MLXSW_TRAP_ID_ETHEMAD, +}; + +static int mlxsw_emad_traps_set(struct mlxsw_core *mlxsw_core) +{ + char htgt_pl[MLXSW_REG_HTGT_LEN]; + char hpkt_pl[MLXSW_REG_HPKT_LEN]; + int err; + + mlxsw_reg_htgt_pack(htgt_pl, MLXSW_REG_HTGT_TRAP_GROUP_EMAD); + err = mlxsw_reg_write(mlxsw_core, MLXSW_REG(htgt), htgt_pl); + if (err) + return err; + + mlxsw_reg_hpkt_pack(hpkt_pl, MLXSW_REG_HPKT_ACTION_TRAP_TO_CPU, + MLXSW_REG_HTGT_TRAP_GROUP_EMAD, + MLXSW_TRAP_ID_ETHEMAD); + return mlxsw_reg_write(mlxsw_core, MLXSW_REG(hpkt), hpkt_pl); +} + +static int mlxsw_emad_init(struct mlxsw_core *mlxsw_core) +{ + int err; + + /* Set the upper 32 bits of the transaction ID field to a random + * number. This allows us to discard EMADs addressed to other + * devices. + */ + get_random_bytes(&mlxsw_core->emad.tid, 4); + mlxsw_core->emad.tid = mlxsw_core->emad.tid << 32; + + init_waitqueue_head(&mlxsw_core->emad.wait); + mlxsw_core->emad.trans_active = false; + mutex_init(&mlxsw_core->emad.lock); + + err = mlxsw_core_rx_listener_register(mlxsw_core, + &mlxsw_emad_rx_listener, + mlxsw_core); + if (err) + return err; + + err = mlxsw_emad_traps_set(mlxsw_core); + if (err) + goto err_emad_trap_set; + + mlxsw_core->emad.use_emad = true; + + return 0; + +err_emad_trap_set: + mlxsw_core_rx_listener_unregister(mlxsw_core, + &mlxsw_emad_rx_listener, + mlxsw_core); + return err; +} + +static void mlxsw_emad_fini(struct mlxsw_core *mlxsw_core) +{ + char hpkt_pl[MLXSW_REG_HPKT_LEN]; + + mlxsw_reg_hpkt_pack(hpkt_pl, MLXSW_REG_HPKT_ACTION_DISCARD, + MLXSW_REG_HTGT_TRAP_GROUP_EMAD, + MLXSW_TRAP_ID_ETHEMAD); + mlxsw_reg_write(mlxsw_core, MLXSW_REG(hpkt), hpkt_pl); + + mlxsw_core_rx_listener_unregister(mlxsw_core, + &mlxsw_emad_rx_listener, + mlxsw_core); +} + +static struct sk_buff *mlxsw_emad_alloc(const struct mlxsw_core *mlxsw_core, + u16 reg_len) +{ + struct sk_buff *skb; + u16 emad_len; + + emad_len = (reg_len + sizeof(u32) + MLXSW_EMAD_ETH_HDR_LEN + + (MLXSW_EMAD_OP_TLV_LEN + MLXSW_EMAD_END_TLV_LEN) * + sizeof(u32) + mlxsw_core->driver->txhdr_len); + if (emad_len > MLXSW_EMAD_MAX_FRAME_LEN) + return NULL; + + skb = netdev_alloc_skb(NULL, emad_len); + if (!skb) + return NULL; + memset(skb->data, 0, emad_len); + skb_reserve(skb, emad_len); + + return skb; +} + /***************** * Core functions *****************/ @@ -307,6 +798,7 @@ int mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info, } INIT_LIST_HEAD(&mlxsw_core->rx_listener_list); + INIT_LIST_HEAD(&mlxsw_core->event_listener_list); mlxsw_core->driver = mlxsw_driver; mlxsw_core->bus = mlxsw_bus; mlxsw_core->bus_priv = bus_priv; @@ -318,10 +810,15 @@ int mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info, 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_emad_init(mlxsw_core); + if (err) + goto err_emad_init; + err = mlxsw_driver->init(mlxsw_core->driver_priv, mlxsw_core, mlxsw_bus_info); if (err) @@ -336,6 +833,8 @@ int mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info, err_debugfs_init: mlxsw_core->driver->fini(mlxsw_core->driver_priv); err_driver_init: + mlxsw_emad_fini(mlxsw_core); +err_emad_init: mlxsw_bus->fini(bus_priv); err_bus_init: free_percpu(mlxsw_core->pcpu_stats); @@ -353,6 +852,7 @@ void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core) mlxsw_core_debugfs_fini(mlxsw_core); mlxsw_core->driver->fini(mlxsw_core->driver_priv); + mlxsw_emad_fini(mlxsw_core); mlxsw_core->bus->fini(mlxsw_core->bus_priv); free_percpu(mlxsw_core->pcpu_stats); kfree(mlxsw_core); @@ -433,6 +933,242 @@ void mlxsw_core_rx_listener_unregister(struct mlxsw_core *mlxsw_core, } EXPORT_SYMBOL(mlxsw_core_rx_listener_unregister); +static void mlxsw_core_event_listener_func(struct sk_buff *skb, u8 local_port, + void *priv) +{ + struct mlxsw_event_listener_item *event_listener_item = priv; + struct mlxsw_reg_info reg; + char *payload; + char *op_tlv = mlxsw_emad_op_tlv(skb); + char *reg_tlv = mlxsw_emad_reg_tlv(skb); + + reg.id = mlxsw_emad_op_tlv_register_id_get(op_tlv); + reg.len = (mlxsw_emad_reg_tlv_len_get(reg_tlv) - 1) * sizeof(u32); + payload = mlxsw_emad_reg_payload(op_tlv); + event_listener_item->el.func(®, payload, event_listener_item->priv); + dev_kfree_skb(skb); +} + +static bool __is_event_listener_equal(const struct mlxsw_event_listener *el_a, + const struct mlxsw_event_listener *el_b) +{ + return (el_a->func == el_b->func && + el_a->trap_id == el_b->trap_id); +} + +static struct mlxsw_event_listener_item * +__find_event_listener_item(struct mlxsw_core *mlxsw_core, + const struct mlxsw_event_listener *el, + void *priv) +{ + struct mlxsw_event_listener_item *el_item; + + list_for_each_entry(el_item, &mlxsw_core->event_listener_list, list) { + if (__is_event_listener_equal(&el_item->el, el) && + el_item->priv == priv) + return el_item; + } + return NULL; +} + +int mlxsw_core_event_listener_register(struct mlxsw_core *mlxsw_core, + const struct mlxsw_event_listener *el, + void *priv) +{ + int err; + struct mlxsw_event_listener_item *el_item; + const struct mlxsw_rx_listener rxl = { + .func = mlxsw_core_event_listener_func, + .local_port = MLXSW_PORT_DONT_CARE, + .trap_id = el->trap_id, + }; + + el_item = __find_event_listener_item(mlxsw_core, el, priv); + if (el_item) + return -EEXIST; + el_item = kmalloc(sizeof(*el_item), GFP_KERNEL); + if (!el_item) + return -ENOMEM; + el_item->el = *el; + el_item->priv = priv; + + err = mlxsw_core_rx_listener_register(mlxsw_core, &rxl, el_item); + if (err) + goto err_rx_listener_register; + + /* No reason to save item if we did not manage to register an RX + * listener for it. + */ + list_add_rcu(&el_item->list, &mlxsw_core->event_listener_list); + + return 0; + +err_rx_listener_register: + kfree(el_item); + return err; +} +EXPORT_SYMBOL(mlxsw_core_event_listener_register); + +void mlxsw_core_event_listener_unregister(struct mlxsw_core *mlxsw_core, + const struct mlxsw_event_listener *el, + void *priv) +{ + struct mlxsw_event_listener_item *el_item; + const struct mlxsw_rx_listener rxl = { + .func = mlxsw_core_event_listener_func, + .local_port = MLXSW_PORT_DONT_CARE, + .trap_id = el->trap_id, + }; + + el_item = __find_event_listener_item(mlxsw_core, el, priv); + if (!el_item) + return; + mlxsw_core_rx_listener_unregister(mlxsw_core, &rxl, el_item); + list_del(&el_item->list); + kfree(el_item); +} +EXPORT_SYMBOL(mlxsw_core_event_listener_unregister); + +static int mlxsw_core_reg_access_emad(struct mlxsw_core *mlxsw_core, + const struct mlxsw_reg_info *reg, + char *payload, + enum mlxsw_core_reg_access_type type) +{ + int err; + char *op_tlv; + struct sk_buff *skb; + struct mlxsw_tx_info tx_info = { + .local_port = MLXSW_PORT_CPU_PORT, + .is_emad = true, + }; + + skb = mlxsw_emad_alloc(mlxsw_core, reg->len); + if (!skb) + return -ENOMEM; + + mlxsw_emad_construct(skb, reg, payload, type, mlxsw_core); + mlxsw_core->driver->txhdr_construct(skb, &tx_info); + + dev_dbg(mlxsw_core->bus_info->dev, "EMAD send (tid=%llx)\n", + mlxsw_core->emad.tid); + mlxsw_core_buf_dump_dbg(mlxsw_core, skb->data, skb->len); + + err = mlxsw_emad_transmit(mlxsw_core, skb, &tx_info); + if (!err) { + op_tlv = mlxsw_emad_op_tlv(mlxsw_core->emad.resp_skb); + memcpy(payload, mlxsw_emad_reg_payload(op_tlv), + reg->len); + + dev_dbg(mlxsw_core->bus_info->dev, "EMAD recv (tid=%llx)\n", + mlxsw_core->emad.tid - 1); + mlxsw_core_buf_dump_dbg(mlxsw_core, + mlxsw_core->emad.resp_skb->data, + skb->len); + + dev_kfree_skb(mlxsw_core->emad.resp_skb); + } + + return err; +} + +static int mlxsw_core_reg_access_cmd(struct mlxsw_core *mlxsw_core, + const struct mlxsw_reg_info *reg, + char *payload, + enum mlxsw_core_reg_access_type type) +{ + int err, n_retry; + char *in_mbox, *out_mbox, *tmp; + + in_mbox = mlxsw_cmd_mbox_alloc(); + if (!in_mbox) + return -ENOMEM; + + out_mbox = mlxsw_cmd_mbox_alloc(); + if (!out_mbox) { + err = -ENOMEM; + goto free_in_mbox; + } + + mlxsw_emad_pack_op_tlv(in_mbox, reg, type, mlxsw_core); + tmp = in_mbox + MLXSW_EMAD_OP_TLV_LEN * sizeof(u32); + mlxsw_emad_pack_reg_tlv(tmp, reg, payload); + + n_retry = 0; +retry: + err = mlxsw_cmd_access_reg(mlxsw_core, in_mbox, out_mbox); + if (!err) { + err = mlxsw_emad_process_status(mlxsw_core, out_mbox); + if (err == -EAGAIN && n_retry++ < MLXSW_EMAD_MAX_RETRY) + goto retry; + } + + if (!err) + memcpy(payload, mlxsw_emad_reg_payload(out_mbox), + reg->len); + + mlxsw_core->emad.tid++; + mlxsw_cmd_mbox_free(out_mbox); +free_in_mbox: + mlxsw_cmd_mbox_free(in_mbox); + return err; +} + +static int mlxsw_core_reg_access(struct mlxsw_core *mlxsw_core, + const struct mlxsw_reg_info *reg, + char *payload, + enum mlxsw_core_reg_access_type type) +{ + u64 cur_tid; + int err; + + if (mutex_lock_interruptible(&mlxsw_core->emad.lock)) { + dev_err(mlxsw_core->bus_info->dev, "Reg access interrupted (reg_id=%x(%s),type=%s)\n", + reg->id, mlxsw_reg_id_str(reg->id), + mlxsw_core_reg_access_type_str(type)); + return -EINTR; + } + + cur_tid = mlxsw_core->emad.tid; + dev_dbg(mlxsw_core->bus_info->dev, "Reg access (tid=%llx,reg_id=%x(%s),type=%s)\n", + cur_tid, reg->id, mlxsw_reg_id_str(reg->id), + mlxsw_core_reg_access_type_str(type)); + + /* During initialization EMAD interface is not available to us, + * so we default to command interface. We switch to EMAD interface + * after setting the appropriate traps. + */ + if (!mlxsw_core->emad.use_emad) + err = mlxsw_core_reg_access_cmd(mlxsw_core, reg, + payload, type); + else + err = mlxsw_core_reg_access_emad(mlxsw_core, reg, + payload, type); + + if (err) + dev_err(mlxsw_core->bus_info->dev, "Reg access failed (tid=%llx,reg_id=%x(%s),type=%s)\n", + cur_tid, reg->id, mlxsw_reg_id_str(reg->id), + mlxsw_core_reg_access_type_str(type)); + + mutex_unlock(&mlxsw_core->emad.lock); + return err; +} + +int mlxsw_reg_query(struct mlxsw_core *mlxsw_core, + const struct mlxsw_reg_info *reg, char *payload) +{ + return mlxsw_core_reg_access(mlxsw_core, reg, payload, + MLXSW_CORE_REG_ACCESS_TYPE_QUERY); +} +EXPORT_SYMBOL(mlxsw_reg_query); + +int mlxsw_reg_write(struct mlxsw_core *mlxsw_core, + const struct mlxsw_reg_info *reg, char *payload) +{ + return mlxsw_core_reg_access(mlxsw_core, reg, payload, + MLXSW_CORE_REG_ACCESS_TYPE_WRITE); +} +EXPORT_SYMBOL(mlxsw_reg_write); + void mlxsw_core_skb_receive(struct mlxsw_core *mlxsw_core, struct sk_buff *skb, struct mlxsw_rx_info *rx_info) { |