/* * dev_nic.c - NIC (Network Controler) generic device API implementation. * * Author Alain Greiner (2016,2017) * * Copyright (c) UPMC Sorbonne Universites * * This file is part of ALMOS-MKH. * * ALMOS-MKH is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2.0 of the License. * * ALMOS-MKH is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with ALMOS-MKH; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include #include #include #include #include #include #include ///////////////////////////////////////////////////////////////////////////////////////// // Extern global variables ///////////////////////////////////////////////////////////////////////////////////////// extern chdev_directory_t chdev_dir; // allocated in kernel_init.c ////////////////////////////////// void dev_nic_init( chdev_t * nic ) { // the PIC chdev must be initialized before the NIC chdev, because // the NIC chdev initialisation requires the routing of an external IRQ. xptr_t pic_xp = chdev_dir.pic; assert( (pic_xp != XPTR_NULL) , __FUNCTION__ , "ICU not initialised before NIC" ); // get "impl" , "channel" , "is_rx" fields from chdev descriptor uint32_t impl = nic->impl; uint32_t channel = nic->channel; bool_t is_rx = nic->is_rx; // set chdev name if( is_rx ) snprintf( nic->name , 16 , "nic_rx_%d" , channel ); else snprintf( nic->name , 16 , "nic_tx_%d" , channel ); // call driver init function hal_drivers_nic_init( nic , impl ); // select a core to execute the NIC server thread lid_t lid = cluster_select_local_core(); // bind the NIC IRQ to the selected core // but does NOT enable it dev_pic_bind_irq( lid , nic ); // create server thread thread_t * new_thread; error_t error; error = thread_kernel_create( &new_thread, THREAD_DEV, &chdev_sequencial_server, nic, lid ); assert( (error == 0) , __FUNCTION__ , "cannot create server thread" ); // set "server" field in chdev descriptor nic->server = new_thread; // start server thread thread_block( new_thread , THREAD_BLOCKED_DEV_QUEUE ); thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL ); } // end dev_nic_init() /////////////////////////////////// error_t dev_nic_read( pkd_t * pkd ) { error_t error; // get pointers on this NIC-RX kernel thread thread_t * thread_ptr = CURRENT_THREAD; xptr_t thread_xp = XPTR( local_cxy , thread_ptr ); // get local pointer on core running this kernel thead core_t * core = thread_ptr->core; nic_dmsg("\n[DMSG] %s enters for NIC-RX thread on core %d in cluster %x\n", __FUNCTION__ , core->lid , local_cxy ); // get pointer on NIC-RX chdev descriptor uint32_t channel = thread_ptr->dev_channel; xptr_t dev_xp = chdev_dir.nic_rx[channel]; cxy_t dev_cxy = GET_CXY( dev_xp ); chdev_t * dev_ptr = (chdev_t *)GET_PTR( dev_xp ); assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined NIC chdev descriptor" ); assert( (dev_cxy == local_cxy) , __FUNCTION__ , " chdev must be local" ); // initialize command in thread descriptor thread_ptr->nic_cmd.dev_xp = dev_xp; // call driver to test readable thread_ptr->nic_cmd.cmd = NIC_CMD_READABLE; dev_ptr->cmd( thread_xp ); // check error error = thread_ptr->nic_cmd.error; if( error ) return error; // block and deschedule if queue non readable if( thread_ptr->nic_cmd.status == false ) { // enable NIC-RX IRQ dev_pic_enable_irq( core->lid , dev_xp ); // block on THREAD_BLOCKED_IO condition and deschedule thread_block( thread_ptr , THREAD_BLOCKED_IO ); sched_yield( NULL ); // disable NIC-RX IRQ dev_pic_disable_irq( core->lid , dev_xp ); } // call driver for actual read thread_ptr->nic_cmd.cmd = NIC_CMD_READ; thread_ptr->nic_cmd.buffer = pkd->buffer; dev_ptr->cmd( thread_xp ); // check error error = thread_ptr->nic_cmd.error; if( error ) return error; // returns packet length pkd->length = thread_ptr->nic_cmd.length; nic_dmsg("\n[DMSG] %s exit for NIC-RX thread on core %d in cluster %x\n", __FUNCTION__ , core->lid , local_cxy ); return 0; } // end dev_nic_read() //////////////////////////////////// error_t dev_nic_write( pkd_t * pkd ) { error_t error; // get pointers on the NIC-TX kernel tread thread_t * thread_ptr = CURRENT_THREAD; xptr_t thread_xp = XPTR( local_cxy , thread_ptr ); // get local pointer on core running this kernel thead core_t * core = thread_ptr->core; nic_dmsg("\n[DMSG] %s enters for NIC-RX thread on core %d in cluster %x\n", __FUNCTION__ , core->lid , local_cxy ); // get pointer on NIC-TX chdev descriptor uint32_t channel = thread_ptr->dev_channel; xptr_t dev_xp = chdev_dir.nic_tx[channel]; cxy_t dev_cxy = GET_CXY( dev_xp ); chdev_t * dev_ptr = (chdev_t *)GET_PTR( dev_xp ); assert ( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined NIC chdev descriptor" ); assert( (dev_cxy == local_cxy) , __FUNCTION__ , " chdev must be local" ); // initialize command in thread descriptor thread_ptr->nic_cmd.dev_xp = dev_xp; // call driver to test writable thread_ptr->nic_cmd.cmd = NIC_CMD_WRITABLE; dev_ptr->cmd( thread_xp ); // check error error = thread_ptr->nic_cmd.error; if( error ) return error; // block and deschedule if queue non writable if( thread_ptr->nic_cmd.status == false ) { // enable NIC-TX IRQ dev_pic_enable_irq( core->lid ,dev_xp ); // block on THREAD_BLOCKED I/O condition and deschedule thread_block( thread_ptr , THREAD_BLOCKED_IO ); sched_yield( NULL ); // disable NIC-TX IRQ dev_pic_disable_irq( core->lid , dev_xp ); } // call driver for actual write thread_ptr->nic_cmd.cmd = NIC_CMD_WRITE; thread_ptr->nic_cmd.buffer = pkd->buffer; thread_ptr->nic_cmd.length = pkd->length; dev_ptr->cmd( thread_xp ); // check error error = thread_ptr->nic_cmd.error; if( error ) return error; nic_dmsg("\n[DMSG] %s exit for NIC-TX thread on core %d in cluster %x\n", __FUNCTION__ , core->lid , local_cxy ); return 0; } // end dev_nic_write()