| /* |
| * Copyright (c) 2015-2016 The Linux Foundation. All rights reserved. |
| * |
| * Previously licensed under the ISC license by Qualcomm Atheros, Inc. |
| * |
| * |
| * Permission to use, copy, modify, and/or distribute this software for |
| * any purpose with or without fee is hereby granted, provided that the |
| * above copyright notice and this permission notice appear in all |
| * copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL |
| * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE |
| * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| * PERFORMANCE OF THIS SOFTWARE. |
| */ |
| |
| /* |
| * This file was originally distributed by Qualcomm Atheros, Inc. |
| * under proprietary terms before Copyright ownership was assigned |
| * to the Linux Foundation. |
| */ |
| |
| /** |
| * DOC: wlan_hdd_napi.c |
| * |
| * WLAN HDD NAPI interface implementation |
| */ |
| #include <smp.h> /* get_cpu */ |
| |
| #include "wlan_hdd_napi.h" |
| #include "cds_api.h" /* cds_get_context */ |
| #include "hif.h" /* hif_map_service...*/ |
| #include "wlan_hdd_main.h" /* hdd_err/warn... */ |
| #include "qdf_types.h" /* QDF_MODULE_ID_... */ |
| #include "ce_api.h" |
| |
| /* guaranteed to be initialized to zero/NULL by the standard */ |
| static struct qca_napi_data *hdd_napi_ctx; |
| |
| /** |
| * hdd_napi_get_all() - return the whole NAPI structure from HIF |
| * |
| * Gets to the data structure common to all NAPI instances. |
| * |
| * Return: |
| * NULL : probably NAPI not initialized yet. |
| * <addr>: the address of the whole NAPI structure |
| */ |
| struct qca_napi_data *hdd_napi_get_all(void) |
| { |
| struct qca_napi_data *rp = NULL; |
| struct hif_opaque_softc *hif; |
| |
| NAPI_DEBUG("-->"); |
| |
| hif = cds_get_context(QDF_MODULE_ID_HIF); |
| if (unlikely(NULL == hif)) |
| QDF_ASSERT(NULL != hif); /* WARN */ |
| else |
| rp = hif_napi_get_all(hif); |
| |
| NAPI_DEBUG("<-- [addr=%p]", rp); |
| return rp; |
| } |
| |
| /** |
| * hdd_napi_get_map() - get a copy of napi pipe map |
| * |
| * Return: |
| * uint32_t : copy of pipe map |
| */ |
| static uint32_t hdd_napi_get_map(void) |
| { |
| uint32_t map = 0; |
| |
| NAPI_DEBUG("-->"); |
| /* cache once, use forever */ |
| if (hdd_napi_ctx == NULL) |
| hdd_napi_ctx = hdd_napi_get_all(); |
| if (hdd_napi_ctx != NULL) |
| map = hdd_napi_ctx->ce_map; |
| |
| NAPI_DEBUG("<-- [map=0x%08x]", map); |
| return map; |
| } |
| |
| /** |
| * hdd_napi_create() - creates the NAPI structures for a given netdev |
| * |
| * Creates NAPI instances. This function is called |
| * unconditionally during initialization. It creates |
| * napi structures through the proper HTC/HIF calls. |
| * The structures are disabled on creation. |
| * |
| * Return: |
| * single-queue: <0: err, >0=id, 0 (should not happen) |
| * multi-queue: bitmap of created instances (0: none) |
| */ |
| int hdd_napi_create(void) |
| { |
| struct hif_opaque_softc *hif_ctx; |
| int rc = 0; |
| |
| NAPI_DEBUG("-->"); |
| |
| hif_ctx = cds_get_context(QDF_MODULE_ID_HIF); |
| if (unlikely(NULL == hif_ctx)) { |
| QDF_ASSERT(NULL != hif_ctx); |
| rc = -EFAULT; |
| } else { |
| rc = hif_napi_create(hif_ctx, hdd_napi_poll, |
| QCA_NAPI_BUDGET, |
| QCA_NAPI_DEF_SCALE); |
| if (rc < 0) |
| hdd_err("ERR(%d) creating NAPI instances", |
| rc); |
| else |
| hdd_info("napi instances were created. Map=0x%x", rc); |
| |
| } |
| NAPI_DEBUG("<-- [rc=%d]", rc); |
| |
| return rc; |
| } |
| |
| /** |
| * hdd_napi_destroy() - destroys the NAPI structures for a given netdev |
| * @force: if set, will force-disable the instance before _del'ing |
| * |
| * Destroy NAPI instances. This function is called |
| * unconditionally during module removal. It destroy |
| * napi structures through the proper HTC/HIF calls. |
| * |
| * Return: |
| * number of NAPI instances destroyed |
| */ |
| int hdd_napi_destroy(int force) |
| { |
| int rc = 0; |
| int i; |
| uint32_t hdd_napi_map = hdd_napi_get_map(); |
| |
| NAPI_DEBUG("--> (force=%d)", force); |
| if (hdd_napi_map) { |
| struct hif_opaque_softc *hif_ctx; |
| |
| hif_ctx = cds_get_context(QDF_MODULE_ID_HIF); |
| if (unlikely(NULL == hif_ctx)) |
| QDF_ASSERT(NULL != hif_ctx); |
| else |
| for (i = 0; i < CE_COUNT_MAX; i++) |
| if (hdd_napi_map & (0x01 << i)) { |
| if (0 <= hif_napi_destroy( |
| hif_ctx, |
| NAPI_PIPE2ID(i), force)) { |
| rc++; |
| hdd_napi_map &= ~(0x01 << i); |
| } else |
| hdd_err("cannot destroy napi %d: (pipe:%d), f=%d\n", |
| i, |
| NAPI_PIPE2ID(i), force); |
| } |
| } |
| |
| /* if all instances are removed, it is likely that hif_context has been |
| * removed as well, so the cached value of the napi context also needs |
| * to be removed |
| */ |
| if (force) |
| QDF_ASSERT(hdd_napi_map == 0); |
| if (0 == hdd_napi_map) |
| hdd_napi_ctx = NULL; |
| |
| NAPI_DEBUG("<-- [rc=%d]", rc); |
| return rc; |
| } |
| |
| /** |
| * hdd_napi_enabled() - checks if NAPI is enabled (for a given id) |
| * @id: the id of the NAPI to check (any= -1) |
| * |
| * Return: |
| * int: 0 = false (NOT enabled) |
| * !0 = true (enabbled) |
| */ |
| int hdd_napi_enabled(int id) |
| { |
| struct hif_opaque_softc *hif; |
| int rc = 0; /* NOT enabled */ |
| |
| hif = cds_get_context(QDF_MODULE_ID_HIF); |
| if (unlikely(NULL == hif)) |
| QDF_ASSERT(hif != NULL); /* WARN_ON; rc = 0 */ |
| else if (-1 == id) |
| rc = hif_napi_enabled(hif, id); |
| else |
| rc = hif_napi_enabled(hif, NAPI_ID2PIPE(id)); |
| return rc; |
| } |
| |
| /** |
| * hdd_napi_event() - relay the event detected by HDD to HIF NAPI decision maker |
| * @event: event code |
| * @data : event-specific auxiliary data |
| * |
| * Return code does not indicate a change, but whether or not NAPI is |
| * enabled at the time of the return of the function. That is, if NAPI |
| * was disabled before the call, and the event does not cause NAPI to be |
| * enabled, a value of 0 will be returned indicating that it is (still) |
| * disabled. |
| * |
| * Return: |
| * < 0: error code |
| * = 0: NAPI state = disabled (after processing the event) |
| * = 1: NAPI state = enabled (after processing the event) |
| */ |
| int hdd_napi_event(enum qca_napi_event event, void *data) |
| { |
| int rc = -EFAULT; /* assume err */ |
| struct hif_opaque_softc *hif; |
| |
| NAPI_DEBUG("-->(event=%d, aux=%p)", event, data); |
| |
| hif = cds_get_context(QDF_MODULE_ID_HIF); |
| if (unlikely(NULL == hif)) |
| QDF_ASSERT(hif != NULL); |
| else |
| rc = hif_napi_event(hif, event, data); |
| |
| NAPI_DEBUG("<--[rc=%d]", rc); |
| return rc; |
| } |
| |
| /** |
| * hdd_napi_poll() - NAPI poll function |
| * @napi : pointer to NAPI struct |
| * @budget: the pre-declared budget |
| * |
| * Implementation of poll function. This function is called |
| * by kernel during softirq processing. |
| * |
| * NOTE FOR THE MAINTAINER: |
| * Make sure this is very close to the ce_tasklet code. |
| * |
| * Return: |
| * int: the amount of work done ( <= budget ) |
| */ |
| int hdd_napi_poll(struct napi_struct *napi, int budget) |
| { |
| return hif_napi_poll(cds_get_context(QDF_MODULE_ID_HIF), napi, budget); |
| } |