diff options
Diffstat (limited to 'drivers/staging/csr/csr_wifi_hip_send.c')
| -rw-r--r-- | drivers/staging/csr/csr_wifi_hip_send.c | 415 |
1 files changed, 0 insertions, 415 deletions
diff --git a/drivers/staging/csr/csr_wifi_hip_send.c b/drivers/staging/csr/csr_wifi_hip_send.c deleted file mode 100644 index 76429e5e77cf..000000000000 --- a/drivers/staging/csr/csr_wifi_hip_send.c +++ /dev/null @@ -1,415 +0,0 @@ -/***************************************************************************** - - (c) Cambridge Silicon Radio Limited 2011 - All rights reserved and confidential information of CSR - - Refer to LICENSE.txt included with this source for details - on the license terms. - -*****************************************************************************/ - -/* - * *************************************************************************** - * - * FILE: csr_wifi_hip_send.c - * - * PURPOSE: - * Code for adding a signal request to the from-host queue. - * When the driver bottom-half is run, it will take requests from the - * queue and pass them to the UniFi. - * - * *************************************************************************** - */ -#include "csr_wifi_hip_unifi.h" -#include "csr_wifi_hip_conversions.h" -#include "csr_wifi_hip_sigs.h" -#include "csr_wifi_hip_card.h" - -unifi_TrafficQueue unifi_frame_priority_to_queue(CSR_PRIORITY priority) -{ - switch (priority) - { - case CSR_QOS_UP0: - case CSR_QOS_UP3: - return UNIFI_TRAFFIC_Q_BE; - case CSR_QOS_UP1: - case CSR_QOS_UP2: - return UNIFI_TRAFFIC_Q_BK; - case CSR_QOS_UP4: - case CSR_QOS_UP5: - return UNIFI_TRAFFIC_Q_VI; - case CSR_QOS_UP6: - case CSR_QOS_UP7: - case CSR_MANAGEMENT: - return UNIFI_TRAFFIC_Q_VO; - default: - return UNIFI_TRAFFIC_Q_BE; - } -} - - -CSR_PRIORITY unifi_get_default_downgrade_priority(unifi_TrafficQueue queue) -{ - switch (queue) - { - case UNIFI_TRAFFIC_Q_BE: - return CSR_QOS_UP0; - case UNIFI_TRAFFIC_Q_BK: - return CSR_QOS_UP1; - case UNIFI_TRAFFIC_Q_VI: - return CSR_QOS_UP5; - case UNIFI_TRAFFIC_Q_VO: - return CSR_QOS_UP6; - default: - return CSR_QOS_UP0; - } -} - - -/* - * --------------------------------------------------------------------------- - * send_signal - * - * This function queues a signal for sending to UniFi. It first checks - * that there is space on the fh_signal_queue for another entry, then - * claims any bulk data slots required and copies data into them. Then - * increments the fh_signal_queue write count. - * - * The fh_signal_queue is later processed by the driver bottom half - * (in unifi_bh()). - * - * This function call unifi_pause_xmit() to pause the flow of data plane - * packets when: - * - the fh_signal_queue ring buffer is full - * - there are less than UNIFI_MAX_DATA_REFERENCES (2) bulk data - * slots available. - * - * Arguments: - * card Pointer to card context structure - * sigptr Pointer to the signal to write to UniFi. - * siglen Number of bytes pointer to by sigptr. - * bulkdata Array of pointers to an associated bulk data. - * sigq To which from-host queue to add the signal. - * - * Returns: - * CSR_RESULT_SUCCESS on success - * CSR_WIFI_HIP_RESULT_NO_SPACE if there were insufficient data slots or - * no free signal queue entry - * - * Notes: - * Calls unifi_pause_xmit() when the last slots are used. - * --------------------------------------------------------------------------- - */ -static CsrResult send_signal(card_t *card, const u8 *sigptr, u32 siglen, - const bulk_data_param_t *bulkdata, - q_t *sigq, u32 priority_q, u32 run_bh) -{ - u16 i, data_slot_size; - card_signal_t *csptr; - s16 qe; - CsrResult r; - s16 debug_print = 0; - - data_slot_size = CardGetDataSlotSize(card); - - /* Check that the fh_data_queue has a free slot */ - if (!CSR_WIFI_HIP_Q_SLOTS_FREE(sigq)) - { - unifi_trace(card->ospriv, UDBG3, "send_signal: %s full\n", sigq->name); - - return CSR_WIFI_HIP_RESULT_NO_SPACE; - } - - /* - * Now add the signal to the From Host signal queue - */ - /* Get next slot on queue */ - qe = CSR_WIFI_HIP_Q_NEXT_W_SLOT(sigq); - csptr = CSR_WIFI_HIP_Q_SLOT_DATA(sigq, qe); - - /* Make up the card_signal struct */ - csptr->signal_length = (u16)siglen; - memcpy((void *)csptr->sigbuf, (void *)sigptr, siglen); - - for (i = 0; i < UNIFI_MAX_DATA_REFERENCES; ++i) - { - if ((bulkdata != NULL) && (bulkdata->d[i].data_length != 0)) - { - u32 datalen = bulkdata->d[i].data_length; - - /* Make sure data will fit in a bulk data slot */ - if (bulkdata->d[i].os_data_ptr == NULL) - { - unifi_error(card->ospriv, "send_signal - NULL bulkdata[%d]\n", i); - debug_print++; - csptr->bulkdata[i].data_length = 0; - } - else - { - if (datalen > data_slot_size) - { - unifi_error(card->ospriv, - "send_signal - Invalid data length %u (@%p), " - "truncating\n", - datalen, bulkdata->d[i].os_data_ptr); - datalen = data_slot_size; - debug_print++; - } - /* Store the bulk data info in the soft queue. */ - csptr->bulkdata[i].os_data_ptr = (u8 *)bulkdata->d[i].os_data_ptr; - csptr->bulkdata[i].os_net_buf_ptr = (u8 *)bulkdata->d[i].os_net_buf_ptr; - csptr->bulkdata[i].net_buf_length = bulkdata->d[i].net_buf_length; - csptr->bulkdata[i].data_length = datalen; - } - } - else - { - UNIFI_INIT_BULK_DATA(&csptr->bulkdata[i]); - } - } - - if (debug_print) - { - const u8 *sig = sigptr; - - unifi_error(card->ospriv, "Signal(%d): %*ph\n", siglen, - 16, sig); - unifi_error(card->ospriv, "Bulkdata pointer %p(%d), %p(%d)\n", - bulkdata != NULL?bulkdata->d[0].os_data_ptr : NULL, - bulkdata != NULL?bulkdata->d[0].data_length : 0, - bulkdata != NULL?bulkdata->d[1].os_data_ptr : NULL, - bulkdata != NULL?bulkdata->d[1].data_length : 0); - } - - /* Advance the written count to say there is a new entry */ - CSR_WIFI_HIP_Q_INC_W(sigq); - - /* - * Set the flag to say reason for waking was a host request. - * Then ask the OS layer to run the unifi_bh. - */ - if (run_bh == 1) - { - card->bh_reason_host = 1; - r = unifi_run_bh(card->ospriv); - if (r != CSR_RESULT_SUCCESS) - { - unifi_error(card->ospriv, "failed to run bh.\n"); - card->bh_reason_host = 0; - - /* - * The bulk data buffer will be freed by the caller. - * We need to invalidate the description of the bulk data in our - * soft queue, to prevent the core freeing the bulk data again later. - */ - for (i = 0; i < UNIFI_MAX_DATA_REFERENCES; ++i) - { - if (csptr->bulkdata[i].data_length != 0) - { - csptr->bulkdata[i].os_data_ptr = csptr->bulkdata[i].os_net_buf_ptr = NULL; - csptr->bulkdata[i].net_buf_length = csptr->bulkdata[i].data_length = 0; - } - } - return r; - } - } - else - { - unifi_error(card->ospriv, "run_bh=%d, bh not called.\n", run_bh); - } - - /* - * Have we used up all the fh signal list entries? - */ - if (CSR_WIFI_HIP_Q_SLOTS_FREE(sigq) == 0) - { - /* We have filled the queue, so stop the upper layer. The command queue - * is an exception, as suspending due to that being full could delay - * resume/retry until new commands or data are received. - */ - if (sigq != &card->fh_command_queue) - { - /* - * Must call unifi_pause_xmit() *before* setting the paused flag. - * (the unifi_pause_xmit call should not be after setting the flag because of the possibility of being interrupted - * by the bh thread between our setting the flag and the call to unifi_pause_xmit() - * If bh thread then cleared the flag, we would end up paused, but without the flag set) - * Instead, setting it afterwards means that if this thread is interrupted by the bh thread - * the pause flag is still guaranteed to end up set - * However the potential deadlock now is that if bh thread emptied the queue and cleared the flag before this thread's - * call to unifi_pause_xmit(), then bh thread may not run again because it will be waiting for - * a packet to appear in the queue but nothing ever will because xmit is paused. - * So we will end up with the queue paused, and the flag set to say it is paused, but bh never runs to unpause it. - * (Note even this bad situation would not persist long in practice, because something else (eg rx, or tx in different queue) - * is likely to wake bh thread quite soon) - * But to avoid this deadlock completely, after setting the flag we check that there is something left in the queue. - * If there is, we know that bh thread has not emptied the queue yet. - * Since bh thread checks to unpause the queue *after* taking packets from the queue, we know that it is still going to make at - * least one more check to see whether it needs to unpause the queue. So all is well. - * If there are no packets in the queue, then the deadlock described above might happen. To make sure it does not, we - * unpause the queue here. A possible side effect is that unifi_restart_xmit() may (rarely) be called for second time - * unnecessarily, which is harmless - */ - -#if defined (CSR_WIFI_HIP_DEBUG_OFFLINE) && defined (CSR_WIFI_HIP_DATA_PLANE_PROFILE) - unifi_debug_log_to_buf("P"); -#endif - unifi_pause_xmit(card->ospriv, (unifi_TrafficQueue)priority_q); - card_tx_q_pause(card, priority_q); - if (CSR_WIFI_HIP_Q_SLOTS_USED(sigq) == 0) - { - card_tx_q_unpause(card, priority_q); - unifi_restart_xmit(card->ospriv, (unifi_TrafficQueue) priority_q); - } - } - else - { - unifi_warning(card->ospriv, - "send_signal: fh_cmd_q full, not pausing (run_bh=%d)\n", - run_bh); - } - } - - return CSR_RESULT_SUCCESS; -} /* send_signal() */ - - -/* - * --------------------------------------------------------------------------- - * unifi_send_signal - * - * Invokes send_signal() to queue a signal in the command or traffic queue - * If sigptr pointer is NULL, it pokes the bh to check if UniFi is responsive. - * - * Arguments: - * card Pointer to card context struct - * sigptr Pointer to signal from card. - * siglen Size of the signal - * bulkdata Pointer to the bulk data of the signal - * - * Returns: - * CSR_RESULT_SUCCESS on success - * CSR_WIFI_HIP_RESULT_NO_SPACE if there were insufficient data slots or no free signal queue entry - * - * Notes: - * unifi_send_signal() is used to queue signals, created by the driver, - * to the device. Signals are constructed using the UniFi packed structures. - * --------------------------------------------------------------------------- - */ -CsrResult unifi_send_signal(card_t *card, const u8 *sigptr, u32 siglen, - const bulk_data_param_t *bulkdata) -{ - q_t *sig_soft_q; - u16 signal_id; - CsrResult r; - u32 run_bh; - u32 priority_q; - - /* A NULL signal pointer is a request to check if UniFi is responsive */ - if (sigptr == NULL) - { - card->bh_reason_host = 1; - return unifi_run_bh(card->ospriv); - } - - priority_q = 0; - run_bh = 1; - signal_id = GET_SIGNAL_ID(sigptr); - /* - * If the signal is a CSR_MA_PACKET_REQUEST , - * we send it using the traffic soft queue. Else we use the command soft queue. - */ - if (signal_id == CSR_MA_PACKET_REQUEST_ID) - { - u16 frame_priority; - - if (card->periodic_wake_mode == UNIFI_PERIODIC_WAKE_HOST_ENABLED) - { - run_bh = 0; - } - -#if defined (CSR_WIFI_HIP_DEBUG_OFFLINE) && defined (CSR_WIFI_HIP_DATA_PLANE_PROFILE) - unifi_debug_log_to_buf("D"); -#endif - /* Sanity check: MA-PACKET.req must have a valid bulk data */ - if ((bulkdata->d[0].data_length == 0) || (bulkdata->d[0].os_data_ptr == NULL)) - { - unifi_error(card->ospriv, "MA-PACKET.req with empty bulk data (%d bytes in %p)\n", - bulkdata->d[0].data_length, bulkdata->d[0].os_data_ptr); - dump((void *)sigptr, siglen); - return CSR_RESULT_FAILURE; - } - - /* Map the frame priority to a traffic queue index. */ - frame_priority = GET_PACKED_MA_PACKET_REQUEST_FRAME_PRIORITY(sigptr); - priority_q = unifi_frame_priority_to_queue((CSR_PRIORITY)frame_priority); - - sig_soft_q = &card->fh_traffic_queue[priority_q]; - } - else - { - sig_soft_q = &card->fh_command_queue; - } - - r = send_signal(card, sigptr, siglen, bulkdata, sig_soft_q, priority_q, run_bh); - /* On error, the caller must free or requeue bulkdata buffers */ - - return r; -} /* unifi_send_signal() */ - - -/* - * --------------------------------------------------------------------------- - * unifi_send_resources_available - * - * Examines whether there is available space to queue - * a signal in the command or traffic queue - * - * Arguments: - * card Pointer to card context struct - * sigptr Pointer to signal. - * - * Returns: - * CSR_RESULT_SUCCESS if resources available - * CSR_WIFI_HIP_RESULT_NO_SPACE if there was no free signal queue entry - * - * Notes: - * --------------------------------------------------------------------------- - */ -CsrResult unifi_send_resources_available(card_t *card, const u8 *sigptr) -{ - q_t *sig_soft_q; - u16 signal_id = GET_SIGNAL_ID(sigptr); - - /* - * If the signal is a CSR_MA_PACKET_REQUEST , - * we send it using the traffic soft queue. Else we use the command soft queue. - */ - if (signal_id == CSR_MA_PACKET_REQUEST_ID) - { - u16 frame_priority; - u32 priority_q; - - /* Map the frame priority to a traffic queue index. */ - frame_priority = GET_PACKED_MA_PACKET_REQUEST_FRAME_PRIORITY(sigptr); - priority_q = unifi_frame_priority_to_queue((CSR_PRIORITY)frame_priority); - - sig_soft_q = &card->fh_traffic_queue[priority_q]; - } - else - { - sig_soft_q = &card->fh_command_queue; - } - - /* Check that the fh_data_queue has a free slot */ - if (!CSR_WIFI_HIP_Q_SLOTS_FREE(sig_soft_q)) - { - unifi_notice(card->ospriv, "unifi_send_resources_available: %s full\n", - sig_soft_q->name); - return CSR_WIFI_HIP_RESULT_NO_SPACE; - } - - return CSR_RESULT_SUCCESS; -} /* unifi_send_resources_available() */ - - |