/* * *************************************************************************** * FILE: ul_int.c * * PURPOSE: * Manage list of client applications using UniFi. * * Copyright (C) 2006-2009 by Cambridge Silicon Radio Ltd. * * Refer to LICENSE.txt included with this source code for details on * the license terms. * * *************************************************************************** */ #include "csr_wifi_hip_unifi.h" #include "csr_wifi_hip_conversions.h" #include "unifi_priv.h" #include "unifiio.h" #include "unifi_os.h" static void free_bulkdata_buffers(unifi_priv_t *priv, bulk_data_param_t *bulkdata); static void reset_driver_status(unifi_priv_t *priv); /* * --------------------------------------------------------------------------- * ul_init_clients * * Initialise the clients array to empty. * * Arguments: * priv Pointer to device private context struct * * Returns: * None. * * Notes: * This function needs to be called before priv is stored in * Unifi_instances[]. * --------------------------------------------------------------------------- */ void ul_init_clients(unifi_priv_t *priv) { int id; ul_client_t *ul_clients; sema_init(&priv->udi_logging_mutex, 1); priv->logging_client = NULL; ul_clients = priv->ul_clients; for (id = 0; id < MAX_UDI_CLIENTS; id++) { memset(&ul_clients[id], 0, sizeof(ul_client_t)); ul_clients[id].client_id = id; ul_clients[id].sender_id = UDI_SENDER_ID_BASE + (id << UDI_SENDER_ID_SHIFT); ul_clients[id].instance = -1; ul_clients[id].event_hook = NULL; INIT_LIST_HEAD(&ul_clients[id].udi_log); init_waitqueue_head(&ul_clients[id].udi_wq); sema_init(&ul_clients[id].udi_sem, 1); ul_clients[id].wake_up_wq_id = 0; ul_clients[id].seq_no = 0; ul_clients[id].wake_seq_no = 0; ul_clients[id].snap_filter.count = 0; } } /* ul_init_clients() */ /* * --------------------------------------------------------------------------- * ul_register_client * * This function registers a new ul client. * * Arguments: * priv Pointer to device private context struct * configuration Special configuration for the client. * udi_event_clbk Callback for receiving event from unifi. * * Returns: * 0 if a new clients is registered, -1 otherwise. * --------------------------------------------------------------------------- */ ul_client_t * ul_register_client(unifi_priv_t *priv, unsigned int configuration, udi_event_t udi_event_clbk) { unsigned char id, ref; ul_client_t *ul_clients; ul_clients = priv->ul_clients; /* check for an unused entry */ for (id = 0; id < MAX_UDI_CLIENTS; id++) { if (ul_clients[id].udi_enabled == 0) { ul_clients[id].instance = priv->instance; ul_clients[id].udi_enabled = 1; ul_clients[id].configuration = configuration; /* Allocate memory for the reply signal.. */ ul_clients[id].reply_signal = kmalloc(sizeof(CSR_SIGNAL), GFP_KERNEL); if (ul_clients[id].reply_signal == NULL) { unifi_error(priv, "Failed to allocate reply signal for client.\n"); return NULL; } /* .. and the bulk data of the reply signal. */ for (ref = 0; ref < UNIFI_MAX_DATA_REFERENCES; ref ++) { ul_clients[id].reply_bulkdata[ref] = kmalloc(sizeof(bulk_data_t), GFP_KERNEL); /* If allocation fails, free allocated memory. */ if (ul_clients[id].reply_bulkdata[ref] == NULL) { for (; ref > 0; ref --) { kfree(ul_clients[id].reply_bulkdata[ref - 1]); } kfree(ul_clients[id].reply_signal); unifi_error(priv, "Failed to allocate bulk data buffers for client.\n"); return NULL; } } /* Set the event callback. */ ul_clients[id].event_hook = udi_event_clbk; unifi_trace(priv, UDBG2, "UDI %d (0x%x) registered. configuration = 0x%x\n", id, &ul_clients[id], configuration); return &ul_clients[id]; } } return NULL; } /* ul_register_client() */ /* * --------------------------------------------------------------------------- * ul_deregister_client * * This function deregisters a blocking UDI client. * * Arguments: * client Pointer to the client we deregister. * * Returns: * 0 if a new clients is deregistered. * --------------------------------------------------------------------------- */ int ul_deregister_client(ul_client_t *ul_client) { struct list_head *pos, *n; udi_log_t *logptr; unifi_priv_t *priv = uf_find_instance(ul_client->instance); int ref; ul_client->instance = -1; ul_client->event_hook = NULL; ul_client->udi_enabled = 0; unifi_trace(priv, UDBG5, "UDI (0x%x) deregistered.\n", ul_client); /* Free memory allocated for the reply signal and its bulk data. */ kfree(ul_client->reply_signal); for (ref = 0; ref < UNIFI_MAX_DATA_REFERENCES; ref ++) { kfree(ul_client->reply_bulkdata[ref]); } if (ul_client->snap_filter.count) { ul_client->snap_filter.count = 0; kfree(ul_client->snap_filter.protocols); } /* Free anything pending on the udi_log list */ down(&ul_client->udi_sem); list_for_each_safe(pos, n, &ul_client->udi_log) { logptr = list_entry(pos, udi_log_t, q); list_del(pos); kfree(logptr); } up(&ul_client->udi_sem); return 0; } /* ul_deregister_client() */ /* * --------------------------------------------------------------------------- * logging_handler * * This function is registered with the driver core. * It is called every time a UniFi HIP Signal is sent. It iterates over * the list of processes interested in receiving log events and * delivers the events to them. * * Arguments: * ospriv Pointer to driver's private data. * sigdata Pointer to the packed signal buffer. * signal_len Length of the packed signal. * bulkdata Pointer to the signal's bulk data. * dir Direction of the signal * 0 = from-host * 1 = to-host * * Returns: * None. * --------------------------------------------------------------------------- */ void logging_handler(void *ospriv, u8 *sigdata, u32 signal_len, const bulk_data_param_t *bulkdata, enum udi_log_direction direction) { unifi_priv_t *priv = (unifi_priv_t*)ospriv; ul_client_t *client; int dir; dir = (direction == UDI_LOG_FROM_HOST) ? UDI_FROM_HOST : UDI_TO_HOST; down(&priv->udi_logging_mutex); client = priv->logging_client; if (client != NULL) { client->event_hook(client, sigdata, signal_len, bulkdata, dir); } up(&priv->udi_logging_mutex); } /* logging_handler() */ /* * --------------------------------------------------------------------------- * ul_log_config_ind * * This function uses the client's register callback * to indicate configuration information e.g core errors. * * Arguments: * priv Pointer to driver's private data. * conf_param Pointer to the configuration data. * len Length of the configuration data. * * Returns: * None. * --------------------------------------------------------------------------- */ void ul_log_config_ind(unifi_priv_t *priv, u8 *conf_param, int len) { #ifdef CSR_SUPPORT_SME if (priv->smepriv == NULL) { return; } if ((CONFIG_IND_ERROR == (*conf_param)) && (priv->wifi_on_state == wifi_on_in_progress)) { unifi_notice(priv, "ul_log_config_ind: wifi on in progress, suppress error\n"); } else { /* wifi_off_ind (error or exit) */ CsrWifiRouterCtrlWifiOffIndSend(priv->CSR_WIFI_SME_IFACEQUEUE,0, (CsrWifiRouterCtrlControlIndication)(*conf_param)); } #ifdef CSR_WIFI_HIP_DEBUG_OFFLINE unifi_debug_buf_dump(); #endif #else bulk_data_param_t bulkdata; /* * If someone killed unifi_managed before the driver was unloaded * the g_drvpriv pointer is going to be NULL. In this case it is * safe to assume that there is no client to get the indication. */ if (!priv) { unifi_notice(NULL, "uf_sme_event_ind: NULL priv\n"); return; } /* Create a null bulkdata structure. */ bulkdata.d[0].data_length = 0; bulkdata.d[1].data_length = 0; sme_native_log_event(priv->sme_cli, conf_param, sizeof(u8), &bulkdata, UDI_CONFIG_IND); #endif /* CSR_SUPPORT_SME */ } /* ul_log_config_ind */ /* * --------------------------------------------------------------------------- * free_bulkdata_buffers * * Free the bulkdata buffers e.g. after a failed unifi_send_signal(). * * Arguments: * priv Pointer to device private struct * bulkdata Pointer to bulkdata parameter table * * Returns: * None. * --------------------------------------------------------------------------- */ static void free_bulkdata_buffers(unifi_priv_t *priv, bulk_data_param_t *bulkdata) { int i; if (bulkdata) { for (i = 0; i < UNIFI_MAX_DATA_REFERENCES; ++i) { if (bulkdata->d[i].data_length != 0) { unifi_net_data_free(priv, (bulk_data_desc_t *)(&bulkdata->d[i])); /* data_length is now 0 */ } } } } /* free_bulkdata_buffers */ static int _align_bulk_data_buffers(unifi_priv_t *priv, u8 *signal, bulk_data_param_t *bulkdata) { unsigned int i; if ((bulkdata == NULL) || (CSR_WIFI_ALIGN_BYTES == 0)) { return 0; } for (i = 0; i < UNIFI_MAX_DATA_REFERENCES; i++) { struct sk_buff *skb; /* * The following complex casting is in place in order to eliminate 64-bit compilation warning * "cast to/from pointer from/to integer of different size" */ u32 align_offset = (u32)(long)(bulkdata->d[i].os_data_ptr) & (CSR_WIFI_ALIGN_BYTES-1); if (align_offset) { skb = (struct sk_buff*)bulkdata->d[i].os_net_buf_ptr; if (skb == NULL) { unifi_warning(priv, "_align_bulk_data_buffers: Align offset found (%d) but skb is NULL!\n", align_offset); return -EINVAL; } if (bulkdata->d[i].data_length == 0) { unifi_warning(priv, "_align_bulk_data_buffers: Align offset found (%d) but length is zero\n", align_offset); return CSR_RESULT_SUCCESS; } unifi_trace(priv, UDBG5, "Align f-h buffer (0x%p) by %d bytes (skb->data: 0x%p)\n", bulkdata->d[i].os_data_ptr, align_offset, skb->data); /* Check if there is enough headroom... */ if (unlikely(skb_headroom(skb) < align_offset)) { struct sk_buff *tmp = skb; unifi_trace(priv, UDBG5, "Headroom not enough - realloc it\n"); skb = skb_realloc_headroom(skb, align_offset); if (skb == NULL) { unifi_error(priv, "_align_bulk_data_buffers: skb_realloc_headroom failed - signal is dropped\n"); return -EFAULT; } /* Free the old bulk data only if allocation succeeds */ kfree_skb(tmp); /* Bulkdata needs to point to the new skb */ bulkdata->d[i].os_net_buf_ptr = (const unsigned char*)skb; bulkdata->d[i].os_data_ptr = (const void*)skb->data; } /* ... before pushing the data to the right alignment offset */ skb_push(skb, align_offset); } /* The direction bit is zero for the from-host */ signal[SIZEOF_SIGNAL_HEADER + (i * SIZEOF_DATAREF) + 1] = align_offset; } return 0; } /* _align_bulk_data_buffers() */ /* * --------------------------------------------------------------------------- * ul_send_signal_unpacked * * This function sends a host formatted signal to unifi. * * Arguments: * priv Pointer to driver's private data. * sigptr Pointer to the signal. * bulkdata Pointer to the signal's bulk data. * * Returns: * O on success, error code otherwise. * * Notes: * The signals have to be sent in the format described in the host interface * specification, i.e wire formatted. Certain clients use the host formatted * structures. The write_pack() transforms the host formatted signal * into the wired formatted signal. The code is in the core, since the signals * are defined therefore binded to the host interface specification. * --------------------------------------------------------------------------- */ int ul_send_signal_unpacked(unifi_priv_t *priv, CSR_SIGNAL *sigptr, bulk_data_param_t *bulkdata) { u8 sigbuf[UNIFI_PACKED_SIGBUF_SIZE]; u16 packed_siglen; CsrResult csrResult; unsigned long lock_flags; int r; csrResult = write_pack(sigptr, sigbuf, &packed_siglen); if (csrResult != CSR_RESULT_SUCCESS) { unifi_error(priv, "Malformed HIP signal in ul_send_signal_unpacked()\n"); return CsrHipResultToStatus(csrResult); } r = _align_bulk_data_buffers(priv, sigbuf, (bulk_data_param_t*)bulkdata); if (r) { return r; } spin_lock_irqsave(&priv->send_signal_lock, lock_flags); csrResult = unifi_send_signal(priv->card, sigbuf, packed_siglen, bulkdata); if (csrResult != CSR_RESULT_SUCCESS) { /* free_bulkdata_buffers(priv, (bulk_data_param_t *)bulkdata); */ spin_unlock_irqrestore(&priv->send_signal_lock, lock_flags); return CsrHipResultToStatus(csrResult); } spin_unlock_irqrestore(&priv->send_signal_lock, lock_flags); return 0; } /* ul_send_signal_unpacked() */ /* * --------------------------------------------------------------------------- * reset_driver_status * * This function is called from ul_send_signal_raw() when it detects * that the SME has sent a MLME-RESET request. * * Arguments: * priv Pointer to device private struct * * Returns: * None. * --------------------------------------------------------------------------- */ static void reset_driver_status(unifi_priv_t *priv) { priv->sta_wmm_capabilities = 0; #ifdef CSR_NATIVE_LINUX #ifdef CSR_SUPPORT_WEXT priv->wext_conf.flag_associated = 0; priv->wext_conf.block_controlled_port = CSR_WIFI_ROUTER_PORT_ACTION_8021X_PORT_OPEN; priv->wext_conf.bss_wmm_capabilities = 0; priv->wext_conf.disable_join_on_ssid_set = 0; #endif #endif } /* reset_driver_status() */ /* * --------------------------------------------------------------------------- * ul_send_signal_raw * * This function sends a wire formatted data signal to unifi. * * Arguments: * priv Pointer to driver's private data. * sigptr Pointer to the signal. * siglen Length of the signal. * bulkdata Pointer to the signal's bulk data. * * Returns: * O on success, error code otherwise. * --------------------------------------------------------------------------- */ int ul_send_signal_raw(unifi_priv_t *priv, unsigned char *sigptr, int siglen, bulk_data_param_t *bulkdata) { CsrResult csrResult; unsigned long lock_flags; int r; /* * Make sure that the signal is updated with the bulk data * alignment for DMA. */ r = _align_bulk_data_buffers(priv, (u8*)sigptr, bulkdata); if (r) { return r; } spin_lock_irqsave(&priv->send_signal_lock, lock_flags); csrResult = unifi_send_signal(priv->card, sigptr, siglen, bulkdata); if (csrResult != CSR_RESULT_SUCCESS) { free_bulkdata_buffers(priv, bulkdata); spin_unlock_irqrestore(&priv->send_signal_lock, lock_flags); return CsrHipResultToStatus(csrResult); } spin_unlock_irqrestore(&priv->send_signal_lock, lock_flags); /* * Since this is use by unicli, if we get an MLME reset request * we need to initialize a few status parameters * that the driver uses to make decisions. */ if (GET_SIGNAL_ID(sigptr) == CSR_MLME_RESET_REQUEST_ID) { reset_driver_status(priv); } return 0; } /* ul_send_signal_raw() */