source: trunk/kernel/devices/dev_nic.c @ 278

Last change on this file since 278 was 259, checked in by max@…, 7 years ago

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[1]1/*
2 * dev_nic.c - NIC (Network Controler) generic device API implementation.
3 *
[188]4 * Author  Alain Greiner    (2016,2017)
[1]5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <hal_types.h>
25#include <hal_special.h>
26#include <printk.h>
[3]27#include <chdev.h>
[1]28#include <thread.h>
[259]29#include <hal_drivers.h>
[1]30#include <dev_nic.h>
31
32/////////////////////////////////////////////////////////////////////////////////////////
33// Extern global variables
34/////////////////////////////////////////////////////////////////////////////////////////
35
[3]36extern chdev_directory_t  chdev_dir;         // allocated in kernel_init.c
[1]37
[188]38//////////////////////////////////
39void dev_nic_init( chdev_t * nic )
[1]40{
[188]41    // the PIC chdev must be initialized before the NIC chdev, because
42    // the NIC chdev initialisation requires the routing of an external IRQ.
43    xptr_t  pic_xp  = chdev_dir.pic;
[1]44
[188]45    assert( (pic_xp != XPTR_NULL) , __FUNCTION__ , "ICU not initialised before NIC" );
46
[3]47    // get "impl" , "channel" , "is_rx" fields from chdev descriptor
[188]48    uint32_t  impl    = nic->impl;
49    uint32_t  channel = nic->channel;
50    bool_t    is_rx   = nic->is_rx;
[1]51
[23]52    // set chdev name
[188]53    if( is_rx ) snprintf( nic->name , 16 , "nic_rx_%d" , channel );
54    else        snprintf( nic->name , 16 , "nic_tx_%d" , channel );
[23]55
[259]56    // call driver init function
57    hal_drivers_nic_init( nic , impl );
[1]58
[188]59    // select a core to execute the NIC server thread
[3]60    lid_t lid = cluster_select_local_core();
[1]61
[188]62    // bind the NIC IRQ to the selected core
63    // but does NOT enable it
64    dev_pic_bind_irq( lid , nic );
[3]65
[1]66    // create server thread
[3]67    thread_t * new_thread;
[1]68    error_t    error;
69
[3]70    error = thread_kernel_create( &new_thread,
71                                  THREAD_DEV,
72                                  &chdev_sequencial_server,
[188]73                                  nic,
[3]74                                  lid ); 
[1]75
[3]76    assert( (error == 0) , __FUNCTION__ , "cannot create server thread" );
[1]77
[3]78    // set "server" field in chdev descriptor
[188]79    nic->server = new_thread;
[1]80   
81    // start server thread
[3]82    thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
[1]83
84}  // end dev_nic_init()
85
86///////////////////////////////////
87error_t dev_nic_read( pkd_t * pkd )
88{
89    error_t  error;
90
91    // get pointers on this NIC-RX kernel thread
92    thread_t * thread_ptr = CURRENT_THREAD;
93    xptr_t     thread_xp  = XPTR( local_cxy , thread_ptr );
94
95    // get local pointer on core running this kernel thead
96    core_t * core = thread_ptr->core;
97
98    nic_dmsg("\n[INFO] %s enters for NIC-RX thread on core %d in cluster %x\n", 
99                 __FUNCTION__ , core->lid , local_cxy );
100
[3]101    // get pointer on NIC-RX chdev descriptor
[1]102    uint32_t   channel = thread_ptr->dev_channel; 
[3]103    xptr_t     dev_xp  = chdev_dir.nic_rx[channel];
[1]104    cxy_t      dev_cxy = GET_CXY( dev_xp );
[3]105    chdev_t  * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
[1]106
[3]107    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined NIC chdev descriptor" );
[1]108
[3]109    assert( (dev_cxy == local_cxy) , __FUNCTION__ , " chdev must be local" );
[1]110
111    // initialize command in thread descriptor
[3]112    thread_ptr->command.nic.dev_xp = dev_xp;
[1]113
114    // call driver to test readable
[3]115    thread_ptr->command.nic.cmd = NIC_CMD_READABLE;
[1]116    dev_ptr->cmd( thread_xp );
117
118    // check error
[3]119    error = thread_ptr->command.nic.error;
[1]120    if( error ) return error;
121
122    // block and deschedule if queue non readable
[3]123    if( thread_ptr->command.nic.status == false ) 
[1]124    {
125        // enable NIC-RX IRQ
[238]126        dev_pic_enable_irq( core->lid , dev_xp );
[1]127
[188]128        // block on THREAD_BLOCKED_IO condition and deschedule
[1]129        thread_block( thread_ptr , THREAD_BLOCKED_IO );
130        sched_yield();
131
[188]132        // disable NIC-RX IRQ
[238]133        dev_pic_disable_irq( core->lid , dev_xp );
[1]134    }
135
136    // call driver for actual read
[3]137    thread_ptr->command.nic.cmd     = NIC_CMD_READ;
138    thread_ptr->command.nic.buffer  = pkd->buffer;
[1]139    dev_ptr->cmd( thread_xp );
140
141    // check error
[3]142    error = thread_ptr->command.nic.error;
[1]143    if( error ) return error;
144
145    // returns packet length   
[3]146    pkd->length = thread_ptr->command.nic.length;
[1]147
148    nic_dmsg("\n[INFO] %s exit for NIC-RX thread on core %d in cluster %x\n", 
149             __FUNCTION__ , core->lid , local_cxy );
150
151    return 0;
152
153}   // end dev_nic_read()
154
155
156////////////////////////////////////
157error_t dev_nic_write( pkd_t * pkd )
158{
159    error_t error;
160
161    // get pointers on the NIC-TX kernel tread
162    thread_t * thread_ptr = CURRENT_THREAD;
163    xptr_t     thread_xp  = XPTR( local_cxy , thread_ptr );
164
165    // get local pointer on core running this kernel thead
166    core_t * core = thread_ptr->core;
167
168    nic_dmsg("\n[INFO] %s enters for NIC-RX thread on core %d in cluster %x\n", 
169                 __FUNCTION__ , core->lid , local_cxy );
170
[3]171    // get pointer on NIC-TX chdev descriptor
[1]172    uint32_t   channel = thread_ptr->dev_channel; 
[3]173    xptr_t     dev_xp  = chdev_dir.nic_tx[channel];
[1]174    cxy_t      dev_cxy = GET_CXY( dev_xp );
[3]175    chdev_t  * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
[1]176
[3]177    assert ( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined NIC chdev descriptor" );
[1]178
[3]179    assert( (dev_cxy == local_cxy) , __FUNCTION__ , " chdev must be local" );
[1]180
181    // initialize command in thread descriptor
[3]182    thread_ptr->command.nic.dev_xp = dev_xp;
[1]183
184    // call driver to test writable
[188]185    thread_ptr->command.nic.cmd = NIC_CMD_WRITABLE;
[1]186    dev_ptr->cmd( thread_xp );
187
188    // check error
[3]189    error = thread_ptr->command.nic.error;
[1]190    if( error ) return error;
191
192    // block and deschedule if queue non writable
[3]193    if( thread_ptr->command.nic.status == false ) 
[1]194    {
195        // enable NIC-TX IRQ
[238]196        dev_pic_enable_irq( core->lid ,dev_xp );
[1]197
198        // block on THREAD_BLOCKED I/O condition and deschedule
199        thread_block( thread_ptr , THREAD_BLOCKED_IO );
200        sched_yield();
201
202        // disable NIC-TX IRQ
[238]203        dev_pic_disable_irq( core->lid , dev_xp );
[1]204    }
205
206    // call driver for actual write
[3]207    thread_ptr->command.nic.cmd    = NIC_CMD_WRITE;
208    thread_ptr->command.nic.buffer = pkd->buffer;
209    thread_ptr->command.nic.length = pkd->length;
[1]210    dev_ptr->cmd( thread_xp );
211
212    // check error
[3]213    error = thread_ptr->command.nic.error;
[1]214    if( error ) return error;
215
216    nic_dmsg("\n[INFO] %s exit for NIC-TX thread on core %d in cluster %x\n", 
217             __FUNCTION__ , core->lid , local_cxy );
218
219    return 0;
220}  // end dev_nic_write()
221
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