source: trunk/kernel/devices/dev_nic.c @ 346

Last change on this file since 346 was 296, checked in by alain, 5 years ago

Several modifs in the generic scheduler and in the hal_context to
fix the context switch mechanism.

File size: 7.0 KB
Line 
1/*
2 * dev_nic.c - NIC (Network Controler) generic device API implementation.
3 *
4 * Author  Alain Greiner    (2016,2017)
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>
27#include <chdev.h>
28#include <thread.h>
29#include <hal_drivers.h>
30#include <dev_nic.h>
31
32/////////////////////////////////////////////////////////////////////////////////////////
33// Extern global variables
34/////////////////////////////////////////////////////////////////////////////////////////
35
36extern chdev_directory_t  chdev_dir;         // allocated in kernel_init.c
37
38//////////////////////////////////
39void dev_nic_init( chdev_t * nic )
40{
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;
44
45    assert( (pic_xp != XPTR_NULL) , __FUNCTION__ , "ICU not initialised before NIC" );
46
47    // get "impl" , "channel" , "is_rx" fields from chdev descriptor
48    uint32_t  impl    = nic->impl;
49    uint32_t  channel = nic->channel;
50    bool_t    is_rx   = nic->is_rx;
51
52    // set chdev name
53    if( is_rx ) snprintf( nic->name , 16 , "nic_rx_%d" , channel );
54    else        snprintf( nic->name , 16 , "nic_tx_%d" , channel );
55
56    // call driver init function
57    hal_drivers_nic_init( nic , impl );
58
59    // select a core to execute the NIC server thread
60    lid_t lid = cluster_select_local_core();
61
62    // bind the NIC IRQ to the selected core
63    // but does NOT enable it
64    dev_pic_bind_irq( lid , nic );
65
66    // create server thread
67    thread_t * new_thread;
68    error_t    error;
69
70    error = thread_kernel_create( &new_thread,
71                                  THREAD_DEV,
72                                  &chdev_sequencial_server,
73                                  nic,
74                                  lid ); 
75
76    assert( (error == 0) , __FUNCTION__ , "cannot create server thread" );
77
78    // set "server" field in chdev descriptor
79    nic->server = new_thread;
80   
81    // start server thread
82    thread_block( new_thread , THREAD_BLOCKED_DEV_QUEUE );
83    thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
84
85}  // end dev_nic_init()
86
87///////////////////////////////////
88error_t dev_nic_read( pkd_t * pkd )
89{
90    error_t  error;
91
92    // get pointers on this NIC-RX kernel thread
93    thread_t * thread_ptr = CURRENT_THREAD;
94    xptr_t     thread_xp  = XPTR( local_cxy , thread_ptr );
95
96    // get local pointer on core running this kernel thead
97    core_t * core = thread_ptr->core;
98
99    nic_dmsg("\n[INFO] %s enters for NIC-RX thread on core %d in cluster %x\n", 
100                 __FUNCTION__ , core->lid , local_cxy );
101
102    // get pointer on NIC-RX chdev descriptor
103    uint32_t   channel = thread_ptr->dev_channel; 
104    xptr_t     dev_xp  = chdev_dir.nic_rx[channel];
105    cxy_t      dev_cxy = GET_CXY( dev_xp );
106    chdev_t  * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
107
108    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined NIC chdev descriptor" );
109
110    assert( (dev_cxy == local_cxy) , __FUNCTION__ , " chdev must be local" );
111
112    // initialize command in thread descriptor
113    thread_ptr->nic_cmd.dev_xp = dev_xp;
114
115    // call driver to test readable
116    thread_ptr->nic_cmd.cmd = NIC_CMD_READABLE;
117    dev_ptr->cmd( thread_xp );
118
119    // check error
120    error = thread_ptr->nic_cmd.error;
121    if( error ) return error;
122
123    // block and deschedule if queue non readable
124    if( thread_ptr->nic_cmd.status == false ) 
125    {
126        // enable NIC-RX IRQ
127        dev_pic_enable_irq( core->lid , dev_xp );
128
129        // block on THREAD_BLOCKED_IO condition and deschedule
130        thread_block( thread_ptr , THREAD_BLOCKED_IO );
131        sched_yield( NULL );
132
133        // disable NIC-RX IRQ
134        dev_pic_disable_irq( core->lid , dev_xp );
135    }
136
137    // call driver for actual read
138    thread_ptr->nic_cmd.cmd     = NIC_CMD_READ;
139    thread_ptr->nic_cmd.buffer  = pkd->buffer;
140    dev_ptr->cmd( thread_xp );
141
142    // check error
143    error = thread_ptr->nic_cmd.error;
144    if( error ) return error;
145
146    // returns packet length   
147    pkd->length = thread_ptr->nic_cmd.length;
148
149    nic_dmsg("\n[INFO] %s exit for NIC-RX thread on core %d in cluster %x\n", 
150             __FUNCTION__ , core->lid , local_cxy );
151
152    return 0;
153
154}   // end dev_nic_read()
155
156
157////////////////////////////////////
158error_t dev_nic_write( pkd_t * pkd )
159{
160    error_t error;
161
162    // get pointers on the NIC-TX kernel tread
163    thread_t * thread_ptr = CURRENT_THREAD;
164    xptr_t     thread_xp  = XPTR( local_cxy , thread_ptr );
165
166    // get local pointer on core running this kernel thead
167    core_t * core = thread_ptr->core;
168
169    nic_dmsg("\n[INFO] %s enters for NIC-RX thread on core %d in cluster %x\n", 
170                 __FUNCTION__ , core->lid , local_cxy );
171
172    // get pointer on NIC-TX chdev descriptor
173    uint32_t   channel = thread_ptr->dev_channel; 
174    xptr_t     dev_xp  = chdev_dir.nic_tx[channel];
175    cxy_t      dev_cxy = GET_CXY( dev_xp );
176    chdev_t  * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
177
178    assert ( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined NIC chdev descriptor" );
179
180    assert( (dev_cxy == local_cxy) , __FUNCTION__ , " chdev must be local" );
181
182    // initialize command in thread descriptor
183    thread_ptr->nic_cmd.dev_xp = dev_xp;
184
185    // call driver to test writable
186    thread_ptr->nic_cmd.cmd = NIC_CMD_WRITABLE;
187    dev_ptr->cmd( thread_xp );
188
189    // check error
190    error = thread_ptr->nic_cmd.error;
191    if( error ) return error;
192
193    // block and deschedule if queue non writable
194    if( thread_ptr->nic_cmd.status == false ) 
195    {
196        // enable NIC-TX IRQ
197        dev_pic_enable_irq( core->lid ,dev_xp );
198
199        // block on THREAD_BLOCKED I/O condition and deschedule
200        thread_block( thread_ptr , THREAD_BLOCKED_IO );
201        sched_yield( NULL );
202
203        // disable NIC-TX IRQ
204        dev_pic_disable_irq( core->lid , dev_xp );
205    }
206
207    // call driver for actual write
208    thread_ptr->nic_cmd.cmd    = NIC_CMD_WRITE;
209    thread_ptr->nic_cmd.buffer = pkd->buffer;
210    thread_ptr->nic_cmd.length = pkd->length;
211    dev_ptr->cmd( thread_xp );
212
213    // check error
214    error = thread_ptr->nic_cmd.error;
215    if( error ) return error;
216
217    nic_dmsg("\n[INFO] %s exit for NIC-TX thread on core %d in cluster %x\n", 
218             __FUNCTION__ , core->lid , local_cxy );
219
220    return 0;
221}  // end dev_nic_write()
222
223
224
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