aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/netronome/nfp/bpf/main.c
blob: bf46f7bff912df180fabd0f9c25df1973ac110a9 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
/*
 * Copyright (C) 2017-2018 Netronome Systems, Inc.
 *
 * This software is dual licensed under the GNU General License Version 2,
 * June 1991 as shown in the file COPYING in the top-level directory of this
 * source tree or the BSD 2-Clause License provided below.  You have the
 * option to license this software under the complete terms of either license.
 *
 * The BSD 2-Clause License:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      1. Redistributions of source code must retain the above
 *         copyright notice, this list of conditions and the following
 *         disclaimer.
 *
 *      2. Redistributions in binary form must reproduce the above
 *         copyright notice, this list of conditions and the following
 *         disclaimer in the documentation and/or other materials
 *         provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <net/pkt_cls.h>

#include "../nfpcore/nfp_cpp.h"
#include "../nfpcore/nfp_nffw.h"
#include "../nfpcore/nfp_nsp.h"
#include "../nfp_app.h"
#include "../nfp_main.h"
#include "../nfp_net.h"
#include "../nfp_port.h"
#include "fw.h"
#include "main.h"

const struct rhashtable_params nfp_bpf_maps_neutral_params = {
	.nelem_hint		= 4,
	.key_len		= FIELD_SIZEOF(struct nfp_bpf_neutral_map, ptr),
	.key_offset		= offsetof(struct nfp_bpf_neutral_map, ptr),
	.head_offset		= offsetof(struct nfp_bpf_neutral_map, l),
	.automatic_shrinking	= true,
};

static bool nfp_net_ebpf_capable(struct nfp_net *nn)
{
#ifdef __LITTLE_ENDIAN
	if (nn->cap & NFP_NET_CFG_CTRL_BPF &&
	    nn_readb(nn, NFP_NET_CFG_BPF_ABI) == NFP_NET_BPF_ABI)
		return true;
#endif
	return false;
}

static int
nfp_bpf_xdp_offload(struct nfp_app *app, struct nfp_net *nn,
		    struct bpf_prog *prog, struct netlink_ext_ack *extack)
{
	bool running, xdp_running;
	int ret;

	if (!nfp_net_ebpf_capable(nn))
		return -EINVAL;

	running = nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF;
	xdp_running = running && nn->dp.bpf_offload_xdp;

	if (!prog && !xdp_running)
		return 0;
	if (prog && running && !xdp_running)
		return -EBUSY;

	ret = nfp_net_bpf_offload(nn, prog, running, extack);
	/* Stop offload if replace not possible */
	if (ret && prog)
		nfp_bpf_xdp_offload(app, nn, NULL, extack);

	nn->dp.bpf_offload_xdp = prog && !ret;
	return ret;
}

static const char *nfp_bpf_extra_cap(struct nfp_app *app, struct nfp_net *nn)
{
	return nfp_net_ebpf_capable(nn) ? "BPF" : "";
}

static int
nfp_bpf_vnic_alloc(struct nfp_app *app, struct nfp_net *nn, unsigned int id)
{
	struct nfp_pf *pf = app->pf;
	struct nfp_bpf_vnic *bv;
	int err;

	if (!pf->eth_tbl) {
		nfp_err(pf->cpp, "No ETH table\n");
		return -EINVAL;
	}
	if (pf->max_data_vnics != pf->eth_tbl->count) {
		nfp_err(pf->cpp, "ETH entries don't match vNICs (%d vs %d)\n",
			pf->max_data_vnics, pf->eth_tbl->count);
		return -EINVAL;
	}

	bv = kzalloc(sizeof(*bv), GFP_KERNEL);
	if (!bv)
		return -ENOMEM;
	nn->app_priv = bv;

	err = nfp_app_nic_vnic_alloc(app, nn, id);
	if (err)
		goto err_free_priv;

	bv->start_off = nn_readw(nn, NFP_NET_CFG_BPF_START);
	bv->tgt_done = nn_readw(nn, NFP_NET_CFG_BPF_DONE);

	return 0;
err_free_priv:
	kfree(nn->app_priv);
	return err;
}

static void nfp_bpf_vnic_free(struct nfp_app *app, struct nfp_net *nn)
{
	struct nfp_bpf_vnic *bv = nn->app_priv;

	WARN_ON(bv->tc_prog);
	kfree(bv);
}

static int nfp_bpf_setup_tc_block_cb(enum tc_setup_type type,
				     void *type_data, void *cb_priv)
{
	struct tc_cls_bpf_offload *cls_bpf = type_data;
	struct nfp_net *nn = cb_priv;
	struct bpf_prog *oldprog;
	struct nfp_bpf_vnic *bv;
	int err;

	if (type != TC_SETUP_CLSBPF) {
		NL_SET_ERR_MSG_MOD(cls_bpf->common.extack,
				   "only offload of BPF classifiers supported");
		return -EOPNOTSUPP;
	}
	if (!tc_cls_can_offload_and_chain0(nn->dp.netdev, &cls_bpf->common))
		return -EOPNOTSUPP;
	if (!nfp_net_ebpf_capable(nn)) {
		NL_SET_ERR_MSG_MOD(cls_bpf->common.extack,
				   "NFP firmware does not support eBPF offload");
		return -EOPNOTSUPP;
	}
	if (cls_bpf->common.protocol != htons(ETH_P_ALL)) {
		NL_SET_ERR_MSG_MOD(cls_bpf->common.extack,
				   "only ETH_P_ALL supported as filter protocol");
		return -EOPNOTSUPP;
	}

	/* Only support TC direct action */
	if (!cls_bpf->exts_integrated ||
	    tcf_exts_has_actions(cls_bpf->exts)) {
		NL_SET_ERR_MSG_MOD(cls_bpf->common.extack,
				   "only direct action with no legacy actions supported");
		return -EOPNOTSUPP;
	}

	if (cls_bpf->command != TC_CLSBPF_OFFLOAD)
		return -EOPNOTSUPP;

	bv = nn->app_priv;
	oldprog = cls_bpf->oldprog;

	/* Don't remove if oldprog doesn't match driver's state */
	if (bv->tc_prog != oldprog) {
		oldprog = NULL;
		if (!cls_bpf->prog)
			return 0;
	}

	err = nfp_net_bpf_offload(nn, cls_bpf->prog, oldprog,
				  cls_bpf->common.extack);
	if (err)
		return err;

	bv->tc_prog = cls_bpf->prog;
	nn->port->tc_offload_cnt = !!bv->tc_prog;
	return 0;
}

static int nfp_bpf_setup_tc_block(struct net_device *netdev,
				  struct tc_block_offload *f)
{
	struct nfp_net *nn = netdev_priv(netdev);

	if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
		return -EOPNOTSUPP;

	switch (f->command) {
	case TC_BLOCK_BIND:
		return tcf_block_cb_register(f->block,
					     nfp_bpf_setup_tc_block_cb,
					     nn, nn, f->extack);
	case TC_BLOCK_UNBIND:
		tcf_block_cb_unregister(f->block,
					nfp_bpf_setup_tc_block_cb,
					nn);
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

static int nfp_bpf_setup_tc(struct nfp_app *app, struct net_device *netdev,
			    enum tc_setup_type type, void *type_data)
{
	switch (type) {
	case TC_SETUP_BLOCK:
		return nfp_bpf_setup_tc_block(netdev, type_data);
	default:
		return -EOPNOTSUPP;
	}
}

static int
nfp_bpf_check_mtu(struct nfp_app *app, struct net_device *netdev, int new_mtu)
{
	struct nfp_net *nn = netdev_priv(netdev);
	unsigned int max_mtu;

	if (~nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF)
		return 0;

	max_mtu = nn_readb(nn, NFP_NET_CFG_BPF_INL_MTU) * 64 - 32;
	if (new_mtu > max_mtu) {
		nn_info(nn, "BPF offload active, MTU over %u not supported\n",
			max_mtu);
		return -EBUSY;
	}
	return 0;
}

static int
nfp_bpf_parse_cap_adjust_head(struct nfp_app_bpf *bpf, void __iomem *value,
			      u32 length)
{
	struct nfp_bpf_cap_tlv_adjust_head __iomem *cap = value;
	struct nfp_cpp *cpp = bpf->app->pf->cpp;

	if (length < sizeof(*cap)) {
		nfp_err(cpp, "truncated adjust_head TLV: %d\n", length);
		return -EINVAL;
	}

	bpf->adjust_head.flags = readl(&cap->flags);
	bpf->adjust_head.off_min = readl(&cap->off_min);
	bpf->adjust_head.off_max = readl(&cap->off_max);
	bpf->adjust_head.guaranteed_sub = readl(&cap->guaranteed_sub);
	bpf->adjust_head.guaranteed_add = readl(&cap->guaranteed_add);

	if (bpf->adjust_head.off_min > bpf->adjust_head.off_max) {
		nfp_err(cpp, "invalid adjust_head TLV: min > max\n");
		return -EINVAL;
	}
	if (!FIELD_FIT(UR_REG_IMM_MAX, bpf->adjust_head.off_min) ||
	    !FIELD_FIT(UR_REG_IMM_MAX, bpf->adjust_head.off_max)) {
		nfp_warn(cpp, "disabling adjust_head - driver expects min/max to fit in as immediates\n");
		memset(&bpf->adjust_head, 0, sizeof(bpf->adjust_head));
		return 0;
	}

	return 0;
}

static int
nfp_bpf_parse_cap_func(struct nfp_app_bpf *bpf, void __iomem *value, u32 length)
{
	struct nfp_bpf_cap_tlv_func __iomem *cap = value;

	if (length < sizeof(*cap)) {
		nfp_err(bpf->app->cpp, "truncated function TLV: %d\n", length);
		return -EINVAL;
	}

	switch (readl(&cap->func_id)) {
	case BPF_FUNC_map_lookup_elem:
		bpf->helpers.map_lookup = readl(&cap->func_addr);
		break;
	case BPF_FUNC_map_update_elem:
		bpf->helpers.map_update = readl(&cap->func_addr);
		break;
	case BPF_FUNC_map_delete_elem:
		bpf->helpers.map_delete = readl(&cap->func_addr);
		break;
	case BPF_FUNC_perf_event_output:
		bpf->helpers.perf_event_output = readl(&cap->func_addr);
		break;
	}

	return 0;
}

static int
nfp_bpf_parse_cap_maps(struct nfp_app_bpf *bpf, void __iomem *value, u32 length)
{
	struct nfp_bpf_cap_tlv_maps __iomem *cap = value;

	if (length < sizeof(*cap)) {
		nfp_err(bpf->app->cpp, "truncated maps TLV: %d\n", length);
		return -EINVAL;
	}

	bpf->maps.types = readl(&cap->types);
	bpf->maps.max_maps = readl(&cap->max_maps);
	bpf->maps.max_elems = readl(&cap->max_elems);
	bpf->maps.max_key_sz = readl(&cap->max_key_sz);
	bpf->maps.max_val_sz = readl(&cap->max_val_sz);
	bpf->maps.max_elem_sz = readl(&cap->max_elem_sz);

	return 0;
}

static int
nfp_bpf_parse_cap_random(struct nfp_app_bpf *bpf, void __iomem *value,
			 u32 length)
{
	bpf->pseudo_random = true;
	return 0;
}

static int
nfp_bpf_parse_cap_qsel(struct nfp_app_bpf *bpf, void __iomem *value, u32 length)
{
	bpf->queue_select = true;
	return 0;
}

static int nfp_bpf_parse_capabilities(struct nfp_app *app)
{
	struct nfp_cpp *cpp = app->pf->cpp;
	struct nfp_cpp_area *area;
	u8 __iomem *mem, *start;

	mem = nfp_rtsym_map(app->pf->rtbl, "_abi_bpf_capabilities", "bpf.cap",
			    8, &area);
	if (IS_ERR(mem))
		return PTR_ERR(mem) == -ENOENT ? 0 : PTR_ERR(mem);

	start = mem;
	while (mem - start + 8 <= nfp_cpp_area_size(area)) {
		u8 __iomem *value;
		u32 type, length;

		type = readl(mem);
		length = readl(mem + 4);
		value = mem + 8;

		mem += 8 + length;
		if (mem - start > nfp_cpp_area_size(area))
			goto err_release_free;

		switch (type) {
		case NFP_BPF_CAP_TYPE_FUNC:
			if (nfp_bpf_parse_cap_func(app->priv, value, length))
				goto err_release_free;
			break;
		case NFP_BPF_CAP_TYPE_ADJUST_HEAD:
			if (nfp_bpf_parse_cap_adjust_head(app->priv, value,
							  length))
				goto err_release_free;
			break;
		case NFP_BPF_CAP_TYPE_MAPS:
			if (nfp_bpf_parse_cap_maps(app->priv, value, length))
				goto err_release_free;
			break;
		case NFP_BPF_CAP_TYPE_RANDOM:
			if (nfp_bpf_parse_cap_random(app->priv, value, length))
				goto err_release_free;
			break;
		case NFP_BPF_CAP_TYPE_QUEUE_SELECT:
			if (nfp_bpf_parse_cap_qsel(app->priv, value, length))
				goto err_release_free;
			break;
		default:
			nfp_dbg(cpp, "unknown BPF capability: %d\n", type);
			break;
		}
	}
	if (mem - start != nfp_cpp_area_size(area)) {
		nfp_err(cpp, "BPF capabilities left after parsing, parsed:%zd total length:%zu\n",
			mem - start, nfp_cpp_area_size(area));
		goto err_release_free;
	}

	nfp_cpp_area_release_free(area);

	return 0;

err_release_free:
	nfp_err(cpp, "invalid BPF capabilities at offset:%zd\n", mem - start);
	nfp_cpp_area_release_free(area);
	return -EINVAL;
}

static int nfp_bpf_init(struct nfp_app *app)
{
	struct nfp_app_bpf *bpf;
	int err;

	bpf = kzalloc(sizeof(*bpf), GFP_KERNEL);
	if (!bpf)
		return -ENOMEM;
	bpf->app = app;
	app->priv = bpf;

	skb_queue_head_init(&bpf->cmsg_replies);
	init_waitqueue_head(&bpf->cmsg_wq);
	INIT_LIST_HEAD(&bpf->map_list);

	err = rhashtable_init(&bpf->maps_neutral, &nfp_bpf_maps_neutral_params);
	if (err)
		goto err_free_bpf;

	err = nfp_bpf_parse_capabilities(app);
	if (err)
		goto err_free_neutral_maps;

	return 0;

err_free_neutral_maps:
	rhashtable_destroy(&bpf->maps_neutral);
err_free_bpf:
	kfree(bpf);
	return err;
}

static void nfp_check_rhashtable_empty(void *ptr, void *arg)
{
	WARN_ON_ONCE(1);
}

static void nfp_bpf_clean(struct nfp_app *app)
{
	struct nfp_app_bpf *bpf = app->priv;

	WARN_ON(!skb_queue_empty(&bpf->cmsg_replies));
	WARN_ON(!list_empty(&bpf->map_list));
	WARN_ON(bpf->maps_in_use || bpf->map_elems_in_use);
	rhashtable_free_and_destroy(&bpf->maps_neutral,
				    nfp_check_rhashtable_empty, NULL);
	kfree(bpf);
}

const struct nfp_app_type app_bpf = {
	.id		= NFP_APP_BPF_NIC,
	.name		= "ebpf",

	.ctrl_cap_mask	= 0,

	.init		= nfp_bpf_init,
	.clean		= nfp_bpf_clean,

	.check_mtu	= nfp_bpf_check_mtu,

	.extra_cap	= nfp_bpf_extra_cap,

	.vnic_alloc	= nfp_bpf_vnic_alloc,
	.vnic_free	= nfp_bpf_vnic_free,

	.ctrl_msg_rx	= nfp_bpf_ctrl_msg_rx,

	.setup_tc	= nfp_bpf_setup_tc,
	.bpf		= nfp_ndo_bpf,
	.xdp_offload	= nfp_bpf_xdp_offload,
};