| /* |
| ************************************************************************** |
| * Copyright (c) 2014, The Linux Foundation. All rights reserved. |
| * 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. |
| ************************************************************************** |
| */ |
| |
| #include "nss_tx_rx_common.h" |
| |
| /* |
| * nss_tun6rd_handler() |
| * Handle NSS -> HLOS messages for 6rd tunnel |
| */ |
| static void nss_tun6rd_handler(struct nss_ctx_instance *nss_ctx, struct nss_cmn_msg *ncm, __attribute__((unused))void *app_data) |
| { |
| struct nss_tun6rd_msg *ntm = (struct nss_tun6rd_msg *)ncm; |
| void *ctx; |
| |
| nss_tun6rd_msg_callback_t cb; |
| |
| BUG_ON(!nss_is_dynamic_interface(ncm->interface)); |
| |
| /* |
| * Is this a valid request/response packet? |
| */ |
| if (ncm->type >= NSS_TUN6RD_MAX) { |
| nss_warning("%p: received invalid message %d for Tun6RD interface", nss_ctx, ncm->type); |
| return; |
| } |
| |
| if (ncm->len > sizeof(struct nss_tun6rd_msg)) { |
| nss_warning("%p: tx request for another interface: %d", nss_ctx, ncm->interface); |
| return; |
| } |
| |
| /* |
| * Update the callback and app_data for NOTIFY messages, tun6rd sends all notify messages |
| * to the same callback/app_data. |
| */ |
| if (ncm->response == NSS_CMM_RESPONSE_NOTIFY) { |
| ncm->cb = (uint32_t)nss_ctx->nss_top->tun6rd_msg_callback; |
| } |
| |
| /* |
| * Log failures |
| */ |
| nss_core_log_msg_failures(nss_ctx, ncm); |
| |
| /* |
| * Do we have a call back |
| */ |
| if (!ncm->cb) { |
| return; |
| } |
| |
| /* |
| * callback |
| */ |
| cb = (nss_tun6rd_msg_callback_t)ncm->cb; |
| ctx = nss_ctx->nss_top->if_ctx[ncm->interface]; |
| |
| /* |
| * call 6rd tunnel callback |
| */ |
| if (!ctx) { |
| nss_warning("%p: Event received for 6rd tunnel interface %d before registration", nss_ctx, ncm->interface); |
| return; |
| } |
| |
| cb(ctx, ntm); |
| } |
| |
| /* |
| * nss_tun6rd_tx() |
| * Transmit a tun6rd message to NSSFW |
| */ |
| nss_tx_status_t nss_tun6rd_tx(struct nss_ctx_instance *nss_ctx, struct nss_tun6rd_msg *msg) |
| { |
| struct nss_tun6rd_msg *nm; |
| struct nss_cmn_msg *ncm = &msg->cm; |
| struct sk_buff *nbuf; |
| int32_t status; |
| |
| NSS_VERIFY_CTX_MAGIC(nss_ctx); |
| if (unlikely(nss_ctx->state != NSS_CORE_STATE_INITIALIZED)) { |
| nss_warning("%p: tun6rd msg dropped as core not ready", nss_ctx); |
| return NSS_TX_FAILURE_NOT_READY; |
| } |
| |
| /* |
| * Sanity check the message |
| */ |
| if (!nss_is_dynamic_interface(ncm->interface)) { |
| nss_warning("%p: tx request for another interface: %d", nss_ctx, ncm->interface); |
| return NSS_TX_FAILURE; |
| } |
| |
| if (ncm->type > NSS_TUN6RD_MAX) { |
| nss_warning("%p: message type out of range: %d", nss_ctx, ncm->type); |
| return NSS_TX_FAILURE; |
| } |
| |
| if (ncm->len > sizeof(struct nss_tun6rd_msg)) { |
| nss_warning("%p: message length is invalid: %d", nss_ctx, ncm->len); |
| return NSS_TX_FAILURE; |
| } |
| |
| nbuf = dev_alloc_skb(NSS_NBUF_PAYLOAD_SIZE); |
| if (unlikely(!nbuf)) { |
| spin_lock_bh(&nss_ctx->nss_top->stats_lock); |
| nss_ctx->nss_top->stats_drv[NSS_STATS_DRV_NBUF_ALLOC_FAILS]++; |
| spin_unlock_bh(&nss_ctx->nss_top->stats_lock); |
| nss_warning("%p: msg dropped as command allocation failed", nss_ctx); |
| return NSS_TX_FAILURE; |
| } |
| |
| /* |
| * Copy the message to our skb |
| */ |
| nm = (struct nss_tun6rd_msg *)skb_put(nbuf, sizeof(struct nss_tun6rd_msg)); |
| memcpy(nm, msg, sizeof(struct nss_tun6rd_msg)); |
| |
| status = nss_core_send_buffer(nss_ctx, 0, nbuf, NSS_IF_CMD_QUEUE, H2N_BUFFER_CTRL, 0); |
| if (status != NSS_CORE_STATUS_SUCCESS) { |
| dev_kfree_skb_any(nbuf); |
| nss_warning("%p: Unable to enqueue 'tun6rd message' \n", nss_ctx); |
| return NSS_TX_FAILURE; |
| } |
| |
| nss_hal_send_interrupt(nss_ctx->nmap, nss_ctx->h2n_desc_rings[NSS_IF_CMD_QUEUE].desc_ring.int_bit, |
| NSS_REGS_H2N_INTR_STATUS_DATA_COMMAND_QUEUE); |
| |
| NSS_PKT_STATS_INCREMENT(nss_ctx, &nss_ctx->nss_top->stats_drv[NSS_STATS_DRV_TX_CMD_REQ]); |
| return NSS_TX_SUCCESS; |
| } |
| |
| /* |
| *********************************** |
| * Register/Unregister/Miscellaneous APIs |
| *********************************** |
| */ |
| |
| /* |
| * nss_register_tun6rd_if() |
| */ |
| struct nss_ctx_instance *nss_register_tun6rd_if(uint32_t if_num, nss_tun6rd_callback_t tun6rd_callback, |
| nss_tun6rd_msg_callback_t event_callback, struct net_device *netdev) |
| { |
| nss_assert((if_num >= NSS_DYNAMIC_IF_START) && (if_num < NSS_SPECIAL_IF_START)); |
| |
| nss_top_main.if_ctx[if_num] = netdev; |
| nss_top_main.if_rx_callback[if_num] = tun6rd_callback; |
| nss_top_main.tun6rd_msg_callback = event_callback; |
| |
| nss_core_register_handler(if_num, nss_tun6rd_handler, NULL); |
| |
| return (struct nss_ctx_instance *)&nss_top_main.nss[nss_top_main.tun6rd_handler_id]; |
| } |
| |
| /* |
| * nss_get_tun6rd_context() |
| */ |
| struct nss_ctx_instance * nss_tun6rd_get_context() |
| { |
| return (struct nss_ctx_instance *)&nss_top_main.nss[nss_top_main.tun6rd_handler_id]; |
| } |
| |
| /* |
| * nss_unregister_tun6rd_if() |
| */ |
| void nss_unregister_tun6rd_if(uint32_t if_num) |
| { |
| nss_assert(nss_is_dynamic_interface(ncm->interface)); |
| |
| nss_top_main.if_rx_callback[if_num] = NULL; |
| nss_top_main.if_ctx[if_num] = NULL; |
| nss_top_main.tun6rd_msg_callback = NULL; |
| |
| nss_core_unregister_handler(if_num); |
| } |
| |
| EXPORT_SYMBOL(nss_tun6rd_get_context); |
| EXPORT_SYMBOL(nss_tun6rd_tx); |
| EXPORT_SYMBOL(nss_register_tun6rd_if); |
| EXPORT_SYMBOL(nss_unregister_tun6rd_if); |