source: trunk/kernel/devices/dev_nic.c @ 280

Last change on this file since 280 was 279, checked in by alain, 7 years ago

1) Introduce independant command fields for the various devices in the thread descriptor.
2) Introduce a new dev_pic_enable_ipi() function in the generic PIC device
3) Fix two bugs identified by Maxime in the scheduler initialisation, and in the sched_select().
4) fix several bugs in the TSAR hal_kentry.S.
5) Introduce a third kgiet segment (besides kdata and kcode) in the TSAR bootloader.

File size: 6.9 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_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
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
101    // get pointer on NIC-RX chdev descriptor
102    uint32_t   channel = thread_ptr->dev_channel; 
103    xptr_t     dev_xp  = chdev_dir.nic_rx[channel];
104    cxy_t      dev_cxy = GET_CXY( dev_xp );
105    chdev_t  * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
106
107    assert( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined NIC chdev descriptor" );
108
109    assert( (dev_cxy == local_cxy) , __FUNCTION__ , " chdev must be local" );
110
111    // initialize command in thread descriptor
112    thread_ptr->nic_cmd.dev_xp = dev_xp;
113
114    // call driver to test readable
115    thread_ptr->nic_cmd.cmd = NIC_CMD_READABLE;
116    dev_ptr->cmd( thread_xp );
117
118    // check error
119    error = thread_ptr->nic_cmd.error;
120    if( error ) return error;
121
122    // block and deschedule if queue non readable
123    if( thread_ptr->nic_cmd.status == false ) 
124    {
125        // enable NIC-RX IRQ
126        dev_pic_enable_irq( core->lid , dev_xp );
127
128        // block on THREAD_BLOCKED_IO condition and deschedule
129        thread_block( thread_ptr , THREAD_BLOCKED_IO );
130        sched_yield();
131
132        // disable NIC-RX IRQ
133        dev_pic_disable_irq( core->lid , dev_xp );
134    }
135
136    // call driver for actual read
137    thread_ptr->nic_cmd.cmd     = NIC_CMD_READ;
138    thread_ptr->nic_cmd.buffer  = pkd->buffer;
139    dev_ptr->cmd( thread_xp );
140
141    // check error
142    error = thread_ptr->nic_cmd.error;
143    if( error ) return error;
144
145    // returns packet length   
146    pkd->length = thread_ptr->nic_cmd.length;
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
171    // get pointer on NIC-TX chdev descriptor
172    uint32_t   channel = thread_ptr->dev_channel; 
173    xptr_t     dev_xp  = chdev_dir.nic_tx[channel];
174    cxy_t      dev_cxy = GET_CXY( dev_xp );
175    chdev_t  * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
176
177    assert ( (dev_xp != XPTR_NULL) , __FUNCTION__ , "undefined NIC chdev descriptor" );
178
179    assert( (dev_cxy == local_cxy) , __FUNCTION__ , " chdev must be local" );
180
181    // initialize command in thread descriptor
182    thread_ptr->nic_cmd.dev_xp = dev_xp;
183
184    // call driver to test writable
185    thread_ptr->nic_cmd.cmd = NIC_CMD_WRITABLE;
186    dev_ptr->cmd( thread_xp );
187
188    // check error
189    error = thread_ptr->nic_cmd.error;
190    if( error ) return error;
191
192    // block and deschedule if queue non writable
193    if( thread_ptr->nic_cmd.status == false ) 
194    {
195        // enable NIC-TX IRQ
196        dev_pic_enable_irq( core->lid ,dev_xp );
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
203        dev_pic_disable_irq( core->lid , dev_xp );
204    }
205
206    // call driver for actual write
207    thread_ptr->nic_cmd.cmd    = NIC_CMD_WRITE;
208    thread_ptr->nic_cmd.buffer = pkd->buffer;
209    thread_ptr->nic_cmd.length = pkd->length;
210    dev_ptr->cmd( thread_xp );
211
212    // check error
213    error = thread_ptr->nic_cmd.error;
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
222
223
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