1/* 2 ************************************************************************** 3 * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved. 4 * Permission to use, copy, modify, and/or distribute this software for 5 * any purpose with or without fee is hereby granted, provided that the 6 * above copyright notice and this permission notice appear in all copies. 7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 10 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 12 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 13 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 14 ************************************************************************** 15 */ 16 17#include "nss_tx_rx_common.h" 18 19/* 20 * nss_tun6rd_handler() 21 * Handle NSS -> HLOS messages for 6rd tunnel 22 */ 23static void nss_tun6rd_handler(struct nss_ctx_instance *nss_ctx, struct nss_cmn_msg *ncm, __attribute__((unused))void *app_data) 24{ 25 struct nss_tun6rd_msg *ntm = (struct nss_tun6rd_msg *)ncm; 26 void *ctx; 27 28 nss_tun6rd_msg_callback_t cb; 29 30 BUG_ON(!nss_is_dynamic_interface(ncm->interface)); 31 32 /* 33 * Is this a valid request/response packet? 34 */ 35 if (ncm->type >= NSS_TUN6RD_MAX) { 36 nss_warning("%p: received invalid message %d for Tun6RD interface", nss_ctx, ncm->type); 37 return; 38 } 39 40 if (ncm->len > sizeof(struct nss_tun6rd_msg)) { 41 nss_warning("%p: tx request for another interface: %d", nss_ctx, ncm->interface); 42 return; 43 } 44 45 /* 46 * Update the callback and app_data for NOTIFY messages, tun6rd sends all notify messages 47 * to the same callback/app_data. 48 */ 49 if (ncm->response == NSS_CMM_RESPONSE_NOTIFY) { 50 ncm->cb = (uint32_t)nss_ctx->nss_top->tun6rd_msg_callback; 51 } 52 53 /* 54 * Log failures 55 */ 56 nss_core_log_msg_failures(nss_ctx, ncm); 57 58 /* 59 * Do we have a call back 60 */ 61 if (!ncm->cb) { 62 return; 63 } 64 65 /* 66 * callback 67 */ 68 cb = (nss_tun6rd_msg_callback_t)ncm->cb; 69 ctx = nss_ctx->nss_top->subsys_dp_register[ncm->interface].ndev; 70 71 /* 72 * call 6rd tunnel callback 73 */ 74 if (!ctx) { 75 nss_warning("%p: Event received for 6rd tunnel interface %d before registration", nss_ctx, ncm->interface); 76 return; 77 } 78 79 cb(ctx, ntm); 80} 81 82/* 83 * nss_tun6rd_tx() 84 * Transmit a tun6rd message to NSSFW 85 */ 86nss_tx_status_t nss_tun6rd_tx(struct nss_ctx_instance *nss_ctx, struct nss_tun6rd_msg *msg) 87{ 88 struct nss_tun6rd_msg *nm; 89 struct nss_cmn_msg *ncm = &msg->cm; 90 struct sk_buff *nbuf; 91 int32_t status; 92 93 NSS_VERIFY_CTX_MAGIC(nss_ctx); 94 if (unlikely(nss_ctx->state != NSS_CORE_STATE_INITIALIZED)) { 95 nss_warning("%p: tun6rd msg dropped as core not ready", nss_ctx); 96 return NSS_TX_FAILURE_NOT_READY; 97 } 98 99 /* 100 * Sanity check the message 101 */ 102 if (!nss_is_dynamic_interface(ncm->interface)) { 103 nss_warning("%p: tx request for another interface: %d", nss_ctx, ncm->interface); 104 return NSS_TX_FAILURE; 105 } 106 107 if (ncm->type > NSS_TUN6RD_MAX) { 108 nss_warning("%p: message type out of range: %d", nss_ctx, ncm->type); 109 return NSS_TX_FAILURE; 110 } 111 112 if (ncm->len > sizeof(struct nss_tun6rd_msg)) { 113 nss_warning("%p: message length is invalid: %d", nss_ctx, ncm->len); 114 return NSS_TX_FAILURE; 115 } 116 117 nbuf = dev_alloc_skb(NSS_NBUF_PAYLOAD_SIZE); 118 if (unlikely(!nbuf)) { 119 NSS_PKT_STATS_INCREMENT(nss_ctx, &nss_ctx->nss_top->stats_drv[NSS_STATS_DRV_NBUF_ALLOC_FAILS]); 120 nss_warning("%p: msg dropped as command allocation failed", nss_ctx); 121 return NSS_TX_FAILURE; 122 } 123 124 /* 125 * Copy the message to our skb 126 */ 127 nm = (struct nss_tun6rd_msg *)skb_put(nbuf, sizeof(struct nss_tun6rd_msg)); 128 memcpy(nm, msg, sizeof(struct nss_tun6rd_msg)); 129 130 status = nss_core_send_buffer(nss_ctx, 0, nbuf, NSS_IF_CMD_QUEUE, H2N_BUFFER_CTRL, 0); 131 if (status != NSS_CORE_STATUS_SUCCESS) { 132 dev_kfree_skb_any(nbuf); 133 nss_warning("%p: Unable to enqueue 'tun6rd message' \n", nss_ctx); 134 return NSS_TX_FAILURE; 135 } 136 137 nss_hal_send_interrupt(nss_ctx->nmap, nss_ctx->h2n_desc_rings[NSS_IF_CMD_QUEUE].desc_ring.int_bit, 138 NSS_REGS_H2N_INTR_STATUS_DATA_COMMAND_QUEUE); 139 140 NSS_PKT_STATS_INCREMENT(nss_ctx, &nss_ctx->nss_top->stats_drv[NSS_STATS_DRV_TX_CMD_REQ]); 141 return NSS_TX_SUCCESS; 142} 143 144/* 145 *********************************** 146 * Register/Unregister/Miscellaneous APIs 147 *********************************** 148 */ 149 150/* 151 * nss_register_tun6rd_if() 152 */ 153struct nss_ctx_instance *nss_register_tun6rd_if(uint32_t if_num, nss_tun6rd_callback_t tun6rd_callback, 154 nss_tun6rd_msg_callback_t event_callback, struct net_device *netdev, uint32_t features) 155{ 156 nss_assert((if_num >= NSS_DYNAMIC_IF_START) && (if_num < NSS_SPECIAL_IF_START)); 157 158 nss_top_main.subsys_dp_register[if_num].ndev = netdev; 159 nss_top_main.subsys_dp_register[if_num].cb = tun6rd_callback; 160 nss_top_main.subsys_dp_register[if_num].app_data = NULL; 161 nss_top_main.subsys_dp_register[if_num].features = features; 162 163 nss_top_main.tun6rd_msg_callback = event_callback; 164 165 nss_core_register_handler(if_num, nss_tun6rd_handler, NULL); 166 167 return (struct nss_ctx_instance *)&nss_top_main.nss[nss_top_main.tun6rd_handler_id]; 168} 169 170/* 171 * nss_get_tun6rd_context() 172 */ 173struct nss_ctx_instance * nss_tun6rd_get_context() 174{ 175 return (struct nss_ctx_instance *)&nss_top_main.nss[nss_top_main.tun6rd_handler_id]; 176} 177 178/* 179 * nss_unregister_tun6rd_if() 180 */ 181void nss_unregister_tun6rd_if(uint32_t if_num) 182{ 183 nss_assert(nss_is_dynamic_interface(if_num)); 184 185 nss_top_main.subsys_dp_register[if_num].ndev = NULL; 186 nss_top_main.subsys_dp_register[if_num].cb = NULL; 187 nss_top_main.subsys_dp_register[if_num].app_data = NULL; 188 nss_top_main.subsys_dp_register[if_num].features = 0; 189 190 nss_top_main.tun6rd_msg_callback = NULL; 191 192 nss_core_unregister_handler(if_num); 193} 194 195/* 196 * nss_tun6rd_msg_init() 197 * Initialize nss_tun6rd msg. 198 */ 199void nss_tun6rd_msg_init(struct nss_tun6rd_msg *ncm, uint16_t if_num, uint32_t type, uint32_t len, void *cb, void *app_data) 200{ 201 nss_cmn_msg_init(&ncm->cm, if_num, type, len, cb, app_data); 202} 203 204EXPORT_SYMBOL(nss_tun6rd_get_context); 205EXPORT_SYMBOL(nss_tun6rd_tx); 206EXPORT_SYMBOL(nss_register_tun6rd_if); 207EXPORT_SYMBOL(nss_unregister_tun6rd_if); 208EXPORT_SYMBOL(nss_tun6rd_msg_init); 209