source: trunk/kernel/devices/dev_nic.c @ 492

Last change on this file since 492 was 492, checked in by viala@…, 3 years ago

Refactoring assert calling to conform with new assert macro.

Made with this command for the general case.
find ./kernel/ hal/ -name "*.c" | xargs sed -i -e '/assert(/ s/,[ ]*FUNCTION[ ]*,/,/'

And some done by hand.

File size: 7.3 KB
Line 
1/*
2 * dev_nic.c - NIC (Network Controler) generic device API implementation.
3 *
4 * Author  Alain Greiner    (2016,2017,2018)
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_kernel_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) , "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%d_rx" , channel );
54    else        snprintf( nic->name , 16 , "nic%d_tx" , 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) , "cannot create server thread" );
77
78    // set "server" field in chdev descriptor
79    nic->server = new_thread;
80   
81    // set "chdev" field in thread descriptor
82    new_thread->chdev = nic;
83
84    // unblock server thread
85    thread_unblock( XPTR( local_cxy , new_thread ) , THREAD_BLOCKED_GLOBAL );
86
87}  // end dev_nic_init()
88
89///////////////////////////////////
90error_t dev_nic_read( pkd_t * pkd )
91{
92    error_t  error;
93
94    // get pointers on this NIC-RX kernel thread
95    thread_t * thread_ptr = CURRENT_THREAD;
96    xptr_t     thread_xp  = XPTR( local_cxy , thread_ptr );
97
98    // get local pointer on core running this kernel thead
99    core_t * core = thread_ptr->core;
100
101#if DEBUG_DEV_NIC_RX
102uint32_t cycle = (uint32_t)hal_get_cycles();
103if( DEBUG_DEV_NIC_RX < cycle )
104printk("\n[DBG] %s : thread %x enters for packet %x in cluster %x\n", 
105__FUNCTION__ , thread_ptr , pkd , local_cxy );
106#endif
107
108    // get pointer on NIC-RX chdev descriptor
109    uint32_t   channel = thread_ptr->chdev->channel; 
110    xptr_t     dev_xp  = chdev_dir.nic_rx[channel];
111    cxy_t      dev_cxy = GET_CXY( dev_xp );
112    chdev_t  * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
113
114    assert( (dev_xp != XPTR_NULL) , "undefined NIC chdev descriptor" );
115
116    assert( (dev_cxy == local_cxy) , " chdev must be local" );
117
118    // initialize command in thread descriptor
119    thread_ptr->nic_cmd.dev_xp = dev_xp;
120
121    // call driver to test readable
122    thread_ptr->nic_cmd.cmd = NIC_CMD_READABLE;
123    dev_ptr->cmd( thread_xp );
124
125    // check error
126    error = thread_ptr->nic_cmd.error;
127    if( error ) return error;
128
129    // block and deschedule if queue non readable
130    if( thread_ptr->nic_cmd.status == false ) 
131    {
132        // enable NIC-RX IRQ
133        dev_pic_enable_irq( core->lid , dev_xp );
134
135        // block on THREAD_BLOCKED_IO condition and deschedule
136        thread_block( XPTR( local_cxy , thread_ptr ) , THREAD_BLOCKED_IO );
137        sched_yield("client blocked on I/O");
138
139        // disable NIC-RX IRQ
140        dev_pic_disable_irq( core->lid , dev_xp );
141    }
142
143    // call driver for actual read
144    thread_ptr->nic_cmd.cmd     = NIC_CMD_READ;
145    thread_ptr->nic_cmd.buffer  = pkd->buffer;
146    dev_ptr->cmd( thread_xp );
147
148    // check error
149    error = thread_ptr->nic_cmd.error;
150    if( error ) return error;
151
152    // returns packet length   
153    pkd->length = thread_ptr->nic_cmd.length;
154
155#if DEBUG_DEV_NIC_RX
156cycle = (uint32_t)hal_get_cycles();
157if( DEBUG_DEV_NIC_RX < cycle )
158printk("\n[DBG] %s : thread %x exit for packet %x in cluster %x\n", 
159__FUNCTION__ , thread_ptr , pkd , local_cxy );
160#endif
161
162    return 0;
163
164}   // end dev_nic_read()
165
166
167////////////////////////////////////
168error_t dev_nic_write( pkd_t * pkd )
169{
170    error_t error;
171
172    // get pointers on the NIC-TX kernel tread
173    thread_t * thread_ptr = CURRENT_THREAD;
174    xptr_t     thread_xp  = XPTR( local_cxy , thread_ptr );
175
176    // get local pointer on core running this kernel thead
177    core_t * core = thread_ptr->core;
178
179#if DEBUG_DEV_NIC_RX
180uint32_t cycle = (uint32_t)hal_get_cycles();
181if( DEBUG_DEV_NIC_RX < cycle )
182printk("\n[DBG] %s : thread %x enters for packet %x in cluster %x\n", 
183__FUNCTION__ , thread_ptr , pkd , local_cxy );
184#endif
185
186    // get pointer on NIC-TX chdev descriptor
187    uint32_t   channel = thread_ptr->chdev->channel; 
188    xptr_t     dev_xp  = chdev_dir.nic_tx[channel];
189    cxy_t      dev_cxy = GET_CXY( dev_xp );
190    chdev_t  * dev_ptr = (chdev_t *)GET_PTR( dev_xp );
191
192    assert( (dev_xp != XPTR_NULL) , "undefined NIC chdev descriptor" );
193
194    assert( (dev_cxy == local_cxy) , " chdev must be local" );
195
196    // initialize command in thread descriptor
197    thread_ptr->nic_cmd.dev_xp = dev_xp;
198
199    // call driver to test writable
200    thread_ptr->nic_cmd.cmd = NIC_CMD_WRITABLE;
201    dev_ptr->cmd( thread_xp );
202
203    // check error
204    error = thread_ptr->nic_cmd.error;
205    if( error ) return error;
206
207    // block and deschedule if queue non writable
208    if( thread_ptr->nic_cmd.status == false ) 
209    {
210        // enable NIC-TX IRQ
211        dev_pic_enable_irq( core->lid ,dev_xp );
212
213        // block on THREAD_BLOCKED I/O condition and deschedule
214        thread_block( XPTR( local_cxy , thread_ptr ) , THREAD_BLOCKED_IO );
215        sched_yield("client blocked on I/O");
216
217        // disable NIC-TX IRQ
218        dev_pic_disable_irq( core->lid , dev_xp );
219    }
220
221    // call driver for actual write
222    thread_ptr->nic_cmd.cmd    = NIC_CMD_WRITE;
223    thread_ptr->nic_cmd.buffer = pkd->buffer;
224    thread_ptr->nic_cmd.length = pkd->length;
225    dev_ptr->cmd( thread_xp );
226
227    // check error
228    error = thread_ptr->nic_cmd.error;
229    if( error ) return error;
230
231#if DEBUG_DEV_NIC_RX
232cycle = (uint32_t)hal_get_cycles();
233if( DEBUG_DEV_NIC_RX < cycle )
234printk("\n[DBG] %s : thread %x exit for packet %x in cluster %x\n", 
235__FUNCTION__ , thread_ptr , pkd , local_cxy );
236#endif
237
238    return 0;
239}  // end dev_nic_write()
240
241
242
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