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Viewing changes to drivers/staging/octeon/ethernet-rx.c

  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-tz023xykf0i6eosh
Tags: upstream-3.2.0
Import upstream version 3.2.0

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drivers/staging/octeon/ethernet-rx.c
 
1
/**********************************************************************
 
2
 * Author: Cavium Networks
 
3
 *
 
4
 * Contact: support@caviumnetworks.com
 
5
 * This file is part of the OCTEON SDK
 
6
 *
 
7
 * Copyright (c) 2003-2010 Cavium Networks
 
8
 *
 
9
 * This file is free software; you can redistribute it and/or modify
 
10
 * it under the terms of the GNU General Public License, Version 2, as
 
11
 * published by the Free Software Foundation.
 
12
 *
 
13
 * This file is distributed in the hope that it will be useful, but
 
14
 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
 
15
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
 
16
 * NONINFRINGEMENT.  See the GNU General Public License for more
 
17
 * details.
 
18
 *
 
19
 * You should have received a copy of the GNU General Public License
 
20
 * along with this file; if not, write to the Free Software
 
21
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
22
 * or visit http://www.gnu.org/licenses/.
 
23
 *
 
24
 * This file may also be available under a different license from Cavium.
 
25
 * Contact Cavium Networks for more information
 
26
**********************************************************************/
 
27
#include <linux/module.h>
 
28
#include <linux/kernel.h>
 
29
#include <linux/cache.h>
 
30
#include <linux/cpumask.h>
 
31
#include <linux/netdevice.h>
 
32
#include <linux/init.h>
 
33
#include <linux/etherdevice.h>
 
34
#include <linux/ip.h>
 
35
#include <linux/string.h>
 
36
#include <linux/prefetch.h>
 
37
#include <linux/ratelimit.h>
 
38
#include <linux/smp.h>
 
39
#include <net/dst.h>
 
40
#ifdef CONFIG_XFRM
 
41
#include <linux/xfrm.h>
 
42
#include <net/xfrm.h>
 
43
#endif /* CONFIG_XFRM */
 
44
 
 
45
#include <linux/atomic.h>
 
46
 
 
47
#include <asm/octeon/octeon.h>
 
48
 
 
49
#include "ethernet-defines.h"
 
50
#include "ethernet-mem.h"
 
51
#include "ethernet-rx.h"
 
52
#include "octeon-ethernet.h"
 
53
#include "ethernet-util.h"
 
54
 
 
55
#include "cvmx-helper.h"
 
56
#include "cvmx-wqe.h"
 
57
#include "cvmx-fau.h"
 
58
#include "cvmx-pow.h"
 
59
#include "cvmx-pip.h"
 
60
#include "cvmx-scratch.h"
 
61
 
 
62
#include "cvmx-gmxx-defs.h"
 
63
 
 
64
struct cvm_napi_wrapper {
 
65
        struct napi_struct napi;
 
66
} ____cacheline_aligned_in_smp;
 
67
 
 
68
static struct cvm_napi_wrapper cvm_oct_napi[NR_CPUS] __cacheline_aligned_in_smp;
 
69
 
 
70
struct cvm_oct_core_state {
 
71
        int baseline_cores;
 
72
        /*
 
73
         * The number of additional cores that could be processing
 
74
         * input packtes.
 
75
         */
 
76
        atomic_t available_cores;
 
77
        cpumask_t cpu_state;
 
78
} ____cacheline_aligned_in_smp;
 
79
 
 
80
static struct cvm_oct_core_state core_state __cacheline_aligned_in_smp;
 
81
 
 
82
static void cvm_oct_enable_napi(void *_)
 
83
{
 
84
        int cpu = smp_processor_id();
 
85
        napi_schedule(&cvm_oct_napi[cpu].napi);
 
86
}
 
87
 
 
88
static void cvm_oct_enable_one_cpu(void)
 
89
{
 
90
        int v;
 
91
        int cpu;
 
92
 
 
93
        /* Check to see if more CPUs are available for receive processing... */
 
94
        v = atomic_sub_if_positive(1, &core_state.available_cores);
 
95
        if (v < 0)
 
96
                return;
 
97
 
 
98
        /* ... if a CPU is available, Turn on NAPI polling for that CPU.  */
 
99
        for_each_online_cpu(cpu) {
 
100
                if (!cpu_test_and_set(cpu, core_state.cpu_state)) {
 
101
                        v = smp_call_function_single(cpu, cvm_oct_enable_napi,
 
102
                                                     NULL, 0);
 
103
                        if (v)
 
104
                                panic("Can't enable NAPI.");
 
105
                        break;
 
106
                }
 
107
        }
 
108
}
 
109
 
 
110
static void cvm_oct_no_more_work(void)
 
111
{
 
112
        int cpu = smp_processor_id();
 
113
 
 
114
        /*
 
115
         * CPU zero is special.  It always has the irq enabled when
 
116
         * waiting for incoming packets.
 
117
         */
 
118
        if (cpu == 0) {
 
119
                enable_irq(OCTEON_IRQ_WORKQ0 + pow_receive_group);
 
120
                return;
 
121
        }
 
122
 
 
123
        cpu_clear(cpu, core_state.cpu_state);
 
124
        atomic_add(1, &core_state.available_cores);
 
125
}
 
126
 
 
127
/**
 
128
 * cvm_oct_do_interrupt - interrupt handler.
 
129
 *
 
130
 * The interrupt occurs whenever the POW has packets in our group.
 
131
 *
 
132
 */
 
133
static irqreturn_t cvm_oct_do_interrupt(int cpl, void *dev_id)
 
134
{
 
135
        /* Disable the IRQ and start napi_poll. */
 
136
        disable_irq_nosync(OCTEON_IRQ_WORKQ0 + pow_receive_group);
 
137
        cvm_oct_enable_napi(NULL);
 
138
 
 
139
        return IRQ_HANDLED;
 
140
}
 
141
 
 
142
/**
 
143
 * cvm_oct_check_rcv_error - process receive errors
 
144
 * @work: Work queue entry pointing to the packet.
 
145
 *
 
146
 * Returns Non-zero if the packet can be dropped, zero otherwise.
 
147
 */
 
148
static inline int cvm_oct_check_rcv_error(cvmx_wqe_t *work)
 
149
{
 
150
        if ((work->word2.snoip.err_code == 10) && (work->len <= 64)) {
 
151
                /*
 
152
                 * Ignore length errors on min size packets. Some
 
153
                 * equipment incorrectly pads packets to 64+4FCS
 
154
                 * instead of 60+4FCS.  Note these packets still get
 
155
                 * counted as frame errors.
 
156
                 */
 
157
        } else
 
158
            if (USE_10MBPS_PREAMBLE_WORKAROUND
 
159
                && ((work->word2.snoip.err_code == 5)
 
160
                    || (work->word2.snoip.err_code == 7))) {
 
161
 
 
162
                /*
 
163
                 * We received a packet with either an alignment error
 
164
                 * or a FCS error. This may be signalling that we are
 
165
                 * running 10Mbps with GMXX_RXX_FRM_CTL[PRE_CHK}
 
166
                 * off. If this is the case we need to parse the
 
167
                 * packet to determine if we can remove a non spec
 
168
                 * preamble and generate a correct packet.
 
169
                 */
 
170
                int interface = cvmx_helper_get_interface_num(work->ipprt);
 
171
                int index = cvmx_helper_get_interface_index_num(work->ipprt);
 
172
                union cvmx_gmxx_rxx_frm_ctl gmxx_rxx_frm_ctl;
 
173
                gmxx_rxx_frm_ctl.u64 =
 
174
                    cvmx_read_csr(CVMX_GMXX_RXX_FRM_CTL(index, interface));
 
175
                if (gmxx_rxx_frm_ctl.s.pre_chk == 0) {
 
176
 
 
177
                        uint8_t *ptr =
 
178
                            cvmx_phys_to_ptr(work->packet_ptr.s.addr);
 
179
                        int i = 0;
 
180
 
 
181
                        while (i < work->len - 1) {
 
182
                                if (*ptr != 0x55)
 
183
                                        break;
 
184
                                ptr++;
 
185
                                i++;
 
186
                        }
 
187
 
 
188
                        if (*ptr == 0xd5) {
 
189
                                /*
 
190
                                  printk_ratelimited("Port %d received 0xd5 preamble\n", work->ipprt);
 
191
                                 */
 
192
                                work->packet_ptr.s.addr += i + 1;
 
193
                                work->len -= i + 5;
 
194
                        } else if ((*ptr & 0xf) == 0xd) {
 
195
                                /*
 
196
                                  printk_ratelimited("Port %d received 0x?d preamble\n", work->ipprt);
 
197
                                 */
 
198
                                work->packet_ptr.s.addr += i;
 
199
                                work->len -= i + 4;
 
200
                                for (i = 0; i < work->len; i++) {
 
201
                                        *ptr =
 
202
                                            ((*ptr & 0xf0) >> 4) |
 
203
                                            ((*(ptr + 1) & 0xf) << 4);
 
204
                                        ptr++;
 
205
                                }
 
206
                        } else {
 
207
                                printk_ratelimited("Port %d unknown preamble, packet "
 
208
                                                   "dropped\n",
 
209
                                                   work->ipprt);
 
210
                                /*
 
211
                                   cvmx_helper_dump_packet(work);
 
212
                                 */
 
213
                                cvm_oct_free_work(work);
 
214
                                return 1;
 
215
                        }
 
216
                }
 
217
        } else {
 
218
                printk_ratelimited("Port %d receive error code %d, packet dropped\n",
 
219
                                   work->ipprt, work->word2.snoip.err_code);
 
220
                cvm_oct_free_work(work);
 
221
                return 1;
 
222
        }
 
223
 
 
224
        return 0;
 
225
}
 
226
 
 
227
/**
 
228
 * cvm_oct_napi_poll - the NAPI poll function.
 
229
 * @napi: The NAPI instance, or null if called from cvm_oct_poll_controller
 
230
 * @budget: Maximum number of packets to receive.
 
231
 *
 
232
 * Returns the number of packets processed.
 
233
 */
 
234
static int cvm_oct_napi_poll(struct napi_struct *napi, int budget)
 
235
{
 
236
        const int       coreid = cvmx_get_core_num();
 
237
        uint64_t        old_group_mask;
 
238
        uint64_t        old_scratch;
 
239
        int             rx_count = 0;
 
240
        int             did_work_request = 0;
 
241
        int             packet_not_copied;
 
242
 
 
243
        /* Prefetch cvm_oct_device since we know we need it soon */
 
244
        prefetch(cvm_oct_device);
 
245
 
 
246
        if (USE_ASYNC_IOBDMA) {
 
247
                /* Save scratch in case userspace is using it */
 
248
                CVMX_SYNCIOBDMA;
 
249
                old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
 
250
        }
 
251
 
 
252
        /* Only allow work for our group (and preserve priorities) */
 
253
        old_group_mask = cvmx_read_csr(CVMX_POW_PP_GRP_MSKX(coreid));
 
254
        cvmx_write_csr(CVMX_POW_PP_GRP_MSKX(coreid),
 
255
                       (old_group_mask & ~0xFFFFull) | 1 << pow_receive_group);
 
256
 
 
257
        if (USE_ASYNC_IOBDMA) {
 
258
                cvmx_pow_work_request_async(CVMX_SCR_SCRATCH, CVMX_POW_NO_WAIT);
 
259
                did_work_request = 1;
 
260
        }
 
261
 
 
262
        while (rx_count < budget) {
 
263
                struct sk_buff *skb = NULL;
 
264
                struct sk_buff **pskb = NULL;
 
265
                int skb_in_hw;
 
266
                cvmx_wqe_t *work;
 
267
 
 
268
                if (USE_ASYNC_IOBDMA && did_work_request)
 
269
                        work = cvmx_pow_work_response_async(CVMX_SCR_SCRATCH);
 
270
                else
 
271
                        work = cvmx_pow_work_request_sync(CVMX_POW_NO_WAIT);
 
272
 
 
273
                prefetch(work);
 
274
                did_work_request = 0;
 
275
                if (work == NULL) {
 
276
                        union cvmx_pow_wq_int wq_int;
 
277
                        wq_int.u64 = 0;
 
278
                        wq_int.s.iq_dis = 1 << pow_receive_group;
 
279
                        wq_int.s.wq_int = 1 << pow_receive_group;
 
280
                        cvmx_write_csr(CVMX_POW_WQ_INT, wq_int.u64);
 
281
                        break;
 
282
                }
 
283
                pskb = (struct sk_buff **)(cvm_oct_get_buffer_ptr(work->packet_ptr) - sizeof(void *));
 
284
                prefetch(pskb);
 
285
 
 
286
                if (USE_ASYNC_IOBDMA && rx_count < (budget - 1)) {
 
287
                        cvmx_pow_work_request_async_nocheck(CVMX_SCR_SCRATCH, CVMX_POW_NO_WAIT);
 
288
                        did_work_request = 1;
 
289
                }
 
290
 
 
291
                if (rx_count == 0) {
 
292
                        /*
 
293
                         * First time through, see if there is enough
 
294
                         * work waiting to merit waking another
 
295
                         * CPU.
 
296
                         */
 
297
                        union cvmx_pow_wq_int_cntx counts;
 
298
                        int backlog;
 
299
                        int cores_in_use = core_state.baseline_cores - atomic_read(&core_state.available_cores);
 
300
                        counts.u64 = cvmx_read_csr(CVMX_POW_WQ_INT_CNTX(pow_receive_group));
 
301
                        backlog = counts.s.iq_cnt + counts.s.ds_cnt;
 
302
                        if (backlog > budget * cores_in_use && napi != NULL)
 
303
                                cvm_oct_enable_one_cpu();
 
304
                }
 
305
 
 
306
                skb_in_hw = USE_SKBUFFS_IN_HW && work->word2.s.bufs == 1;
 
307
                if (likely(skb_in_hw)) {
 
308
                        skb = *pskb;
 
309
                        prefetch(&skb->head);
 
310
                        prefetch(&skb->len);
 
311
                }
 
312
                prefetch(cvm_oct_device[work->ipprt]);
 
313
 
 
314
                /* Immediately throw away all packets with receive errors */
 
315
                if (unlikely(work->word2.snoip.rcv_error)) {
 
316
                        if (cvm_oct_check_rcv_error(work))
 
317
                                continue;
 
318
                }
 
319
 
 
320
                /*
 
321
                 * We can only use the zero copy path if skbuffs are
 
322
                 * in the FPA pool and the packet fits in a single
 
323
                 * buffer.
 
324
                 */
 
325
                if (likely(skb_in_hw)) {
 
326
                        skb->data = skb->head + work->packet_ptr.s.addr - cvmx_ptr_to_phys(skb->head);
 
327
                        prefetch(skb->data);
 
328
                        skb->len = work->len;
 
329
                        skb_set_tail_pointer(skb, skb->len);
 
330
                        packet_not_copied = 1;
 
331
                } else {
 
332
                        /*
 
333
                         * We have to copy the packet. First allocate
 
334
                         * an skbuff for it.
 
335
                         */
 
336
                        skb = dev_alloc_skb(work->len);
 
337
                        if (!skb) {
 
338
                                printk_ratelimited("Port %d failed to allocate "
 
339
                                                   "skbuff, packet dropped\n",
 
340
                                                   work->ipprt);
 
341
                                cvm_oct_free_work(work);
 
342
                                continue;
 
343
                        }
 
344
 
 
345
                        /*
 
346
                         * Check if we've received a packet that was
 
347
                         * entirely stored in the work entry.
 
348
                         */
 
349
                        if (unlikely(work->word2.s.bufs == 0)) {
 
350
                                uint8_t *ptr = work->packet_data;
 
351
 
 
352
                                if (likely(!work->word2.s.not_IP)) {
 
353
                                        /*
 
354
                                         * The beginning of the packet
 
355
                                         * moves for IP packets.
 
356
                                         */
 
357
                                        if (work->word2.s.is_v6)
 
358
                                                ptr += 2;
 
359
                                        else
 
360
                                                ptr += 6;
 
361
                                }
 
362
                                memcpy(skb_put(skb, work->len), ptr, work->len);
 
363
                                /* No packet buffers to free */
 
364
                        } else {
 
365
                                int segments = work->word2.s.bufs;
 
366
                                union cvmx_buf_ptr segment_ptr = work->packet_ptr;
 
367
                                int len = work->len;
 
368
 
 
369
                                while (segments--) {
 
370
                                        union cvmx_buf_ptr next_ptr =
 
371
                                            *(union cvmx_buf_ptr *)cvmx_phys_to_ptr(segment_ptr.s.addr - 8);
 
372
 
 
373
                        /*
 
374
                         * Octeon Errata PKI-100: The segment size is
 
375
                         * wrong. Until it is fixed, calculate the
 
376
                         * segment size based on the packet pool
 
377
                         * buffer size. When it is fixed, the
 
378
                         * following line should be replaced with this
 
379
                         * one: int segment_size =
 
380
                         * segment_ptr.s.size;
 
381
                         */
 
382
                                        int segment_size = CVMX_FPA_PACKET_POOL_SIZE -
 
383
                                                (segment_ptr.s.addr - (((segment_ptr.s.addr >> 7) - segment_ptr.s.back) << 7));
 
384
                                        /*
 
385
                                         * Don't copy more than what
 
386
                                         * is left in the packet.
 
387
                                         */
 
388
                                        if (segment_size > len)
 
389
                                                segment_size = len;
 
390
                                        /* Copy the data into the packet */
 
391
                                        memcpy(skb_put(skb, segment_size),
 
392
                                               cvmx_phys_to_ptr(segment_ptr.s.addr),
 
393
                                               segment_size);
 
394
                                        len -= segment_size;
 
395
                                        segment_ptr = next_ptr;
 
396
                                }
 
397
                        }
 
398
                        packet_not_copied = 0;
 
399
                }
 
400
 
 
401
                if (likely((work->ipprt < TOTAL_NUMBER_OF_PORTS) &&
 
402
                           cvm_oct_device[work->ipprt])) {
 
403
                        struct net_device *dev = cvm_oct_device[work->ipprt];
 
404
                        struct octeon_ethernet *priv = netdev_priv(dev);
 
405
 
 
406
                        /*
 
407
                         * Only accept packets for devices that are
 
408
                         * currently up.
 
409
                         */
 
410
                        if (likely(dev->flags & IFF_UP)) {
 
411
                                skb->protocol = eth_type_trans(skb, dev);
 
412
                                skb->dev = dev;
 
413
 
 
414
                                if (unlikely(work->word2.s.not_IP || work->word2.s.IP_exc ||
 
415
                                        work->word2.s.L4_error || !work->word2.s.tcp_or_udp))
 
416
                                        skb->ip_summed = CHECKSUM_NONE;
 
417
                                else
 
418
                                        skb->ip_summed = CHECKSUM_UNNECESSARY;
 
419
 
 
420
                                /* Increment RX stats for virtual ports */
 
421
                                if (work->ipprt >= CVMX_PIP_NUM_INPUT_PORTS) {
 
422
#ifdef CONFIG_64BIT
 
423
                                        atomic64_add(1, (atomic64_t *)&priv->stats.rx_packets);
 
424
                                        atomic64_add(skb->len, (atomic64_t *)&priv->stats.rx_bytes);
 
425
#else
 
426
                                        atomic_add(1, (atomic_t *)&priv->stats.rx_packets);
 
427
                                        atomic_add(skb->len, (atomic_t *)&priv->stats.rx_bytes);
 
428
#endif
 
429
                                }
 
430
                                netif_receive_skb(skb);
 
431
                                rx_count++;
 
432
                        } else {
 
433
                                /* Drop any packet received for a device that isn't up */
 
434
                                /*
 
435
                                  printk_ratelimited("%s: Device not up, packet dropped\n",
 
436
                                           dev->name);
 
437
                                */
 
438
#ifdef CONFIG_64BIT
 
439
                                atomic64_add(1, (atomic64_t *)&priv->stats.rx_dropped);
 
440
#else
 
441
                                atomic_add(1, (atomic_t *)&priv->stats.rx_dropped);
 
442
#endif
 
443
                                dev_kfree_skb_irq(skb);
 
444
                        }
 
445
                } else {
 
446
                        /*
 
447
                         * Drop any packet received for a device that
 
448
                         * doesn't exist.
 
449
                         */
 
450
                        printk_ratelimited("Port %d not controlled by Linux, packet dropped\n",
 
451
                                   work->ipprt);
 
452
                        dev_kfree_skb_irq(skb);
 
453
                }
 
454
                /*
 
455
                 * Check to see if the skbuff and work share the same
 
456
                 * packet buffer.
 
457
                 */
 
458
                if (USE_SKBUFFS_IN_HW && likely(packet_not_copied)) {
 
459
                        /*
 
460
                         * This buffer needs to be replaced, increment
 
461
                         * the number of buffers we need to free by
 
462
                         * one.
 
463
                         */
 
464
                        cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE,
 
465
                                              1);
 
466
 
 
467
                        cvmx_fpa_free(work, CVMX_FPA_WQE_POOL,
 
468
                                      DONT_WRITEBACK(1));
 
469
                } else {
 
470
                        cvm_oct_free_work(work);
 
471
                }
 
472
        }
 
473
        /* Restore the original POW group mask */
 
474
        cvmx_write_csr(CVMX_POW_PP_GRP_MSKX(coreid), old_group_mask);
 
475
        if (USE_ASYNC_IOBDMA) {
 
476
                /* Restore the scratch area */
 
477
                cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
 
478
        }
 
479
        cvm_oct_rx_refill_pool(0);
 
480
 
 
481
        if (rx_count < budget && napi != NULL) {
 
482
                /* No more work */
 
483
                napi_complete(napi);
 
484
                cvm_oct_no_more_work();
 
485
        }
 
486
        return rx_count;
 
487
}
 
488
 
 
489
#ifdef CONFIG_NET_POLL_CONTROLLER
 
490
/**
 
491
 * cvm_oct_poll_controller - poll for receive packets
 
492
 * device.
 
493
 *
 
494
 * @dev:    Device to poll. Unused
 
495
 */
 
496
void cvm_oct_poll_controller(struct net_device *dev)
 
497
{
 
498
        cvm_oct_napi_poll(NULL, 16);
 
499
}
 
500
#endif
 
501
 
 
502
void cvm_oct_rx_initialize(void)
 
503
{
 
504
        int i;
 
505
        struct net_device *dev_for_napi = NULL;
 
506
        union cvmx_pow_wq_int_thrx int_thr;
 
507
        union cvmx_pow_wq_int_pc int_pc;
 
508
 
 
509
        for (i = 0; i < TOTAL_NUMBER_OF_PORTS; i++) {
 
510
                if (cvm_oct_device[i]) {
 
511
                        dev_for_napi = cvm_oct_device[i];
 
512
                        break;
 
513
                }
 
514
        }
 
515
 
 
516
        if (NULL == dev_for_napi)
 
517
                panic("No net_devices were allocated.");
 
518
 
 
519
        if (max_rx_cpus > 1  && max_rx_cpus < num_online_cpus())
 
520
                atomic_set(&core_state.available_cores, max_rx_cpus);
 
521
        else
 
522
                atomic_set(&core_state.available_cores, num_online_cpus());
 
523
        core_state.baseline_cores = atomic_read(&core_state.available_cores);
 
524
 
 
525
        core_state.cpu_state = CPU_MASK_NONE;
 
526
        for_each_possible_cpu(i) {
 
527
                netif_napi_add(dev_for_napi, &cvm_oct_napi[i].napi,
 
528
                               cvm_oct_napi_poll, rx_napi_weight);
 
529
                napi_enable(&cvm_oct_napi[i].napi);
 
530
        }
 
531
        /* Register an IRQ hander for to receive POW interrupts */
 
532
        i = request_irq(OCTEON_IRQ_WORKQ0 + pow_receive_group,
 
533
                        cvm_oct_do_interrupt, 0, "Ethernet", cvm_oct_device);
 
534
 
 
535
        if (i)
 
536
                panic("Could not acquire Ethernet IRQ %d\n",
 
537
                      OCTEON_IRQ_WORKQ0 + pow_receive_group);
 
538
 
 
539
        disable_irq_nosync(OCTEON_IRQ_WORKQ0 + pow_receive_group);
 
540
 
 
541
        int_thr.u64 = 0;
 
542
        int_thr.s.tc_en = 1;
 
543
        int_thr.s.tc_thr = 1;
 
544
        /* Enable POW interrupt when our port has at least one packet */
 
545
        cvmx_write_csr(CVMX_POW_WQ_INT_THRX(pow_receive_group), int_thr.u64);
 
546
 
 
547
        int_pc.u64 = 0;
 
548
        int_pc.s.pc_thr = 5;
 
549
        cvmx_write_csr(CVMX_POW_WQ_INT_PC, int_pc.u64);
 
550
 
 
551
 
 
552
        /* Scheduld NAPI now.  This will indirectly enable interrupts. */
 
553
        cvm_oct_enable_one_cpu();
 
554
}
 
555
 
 
556
void cvm_oct_rx_shutdown(void)
 
557
{
 
558
        int i;
 
559
        /* Shutdown all of the NAPIs */
 
560
        for_each_possible_cpu(i)
 
561
                netif_napi_del(&cvm_oct_napi[i].napi);
 
562
}