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2024-05-10 23fa18eaa71266feff7ba8d83022d9e1cc83c65a 
 kernel/net/core/xdp.c
....@@ -1,7 +1,7 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /* net/core/xdp.c
23  *
34  * Copyright (c) 2017 Jesper Dangaard Brouer, Red Hat Inc.
4
- * Released under terms in GPL version 2.  See COPYING.
55  */
66 #include <linux/bpf.h>
77 #include <linux/filter.h>
....@@ -11,9 +11,13 @@
1111 #include <linux/slab.h>
1212 #include <linux/idr.h>
1313 #include <linux/rhashtable.h>
14
+#include <linux/bug.h>
1415 #include <net/page_pool.h>
1516 
1617 #include <net/xdp.h>
18
+#include <net/xdp_priv.h> /* struct xdp_mem_allocator */
19
+#include <trace/events/xdp.h>
20
+#include <net/xdp_sock_drv.h>
1721 
1822 #define REG_STATE_NEW		0x0
1923 #define REG_STATE_REGISTERED	0x1
....@@ -29,23 +33,12 @@
2933 static bool mem_id_init; /* false */
3034 static struct rhashtable *mem_id_ht;
3135 
32
-struct xdp_mem_allocator {
33
-	struct xdp_mem_info mem;
34
-	union {
35
-		void *allocator;
36
-		struct page_pool *page_pool;
37
-		struct zero_copy_allocator *zc_alloc;
38
-	};
39
-	struct rhash_head node;
40
-	struct rcu_head rcu;
41
-};
42
-
4336 static u32 xdp_mem_id_hashfn(const void *data, u32 len, u32 seed)
4437 {
4538 	const u32 *k = data;
4639 	const u32 key = *k;
4740 
48
-	BUILD_BUG_ON(FIELD_SIZEOF(struct xdp_mem_allocator, mem.id)
41
+	BUILD_BUG_ON(sizeof_field(struct xdp_mem_allocator, mem.id)
4942 		     != sizeof(u32));
5043 
5144 	/* Use cyclic increasing ID as direct hash key */
....@@ -65,7 +58,7 @@
6558 	.nelem_hint = 64,
6659 	.head_offset = offsetof(struct xdp_mem_allocator, node),
6760 	.key_offset  = offsetof(struct xdp_mem_allocator, mem.id),
68
-	.key_len = FIELD_SIZEOF(struct xdp_mem_allocator, mem.id),
61
+	.key_len = sizeof_field(struct xdp_mem_allocator, mem.id),
6962 	.max_size = MEM_ID_MAX,
7063 	.min_size = 8,
7164 	.automatic_shrinking = true,
....@@ -82,34 +75,62 @@
8275 	/* Allow this ID to be reused */
8376 	ida_simple_remove(&mem_id_pool, xa->mem.id);
8477 
85
-	/* Notice, driver is expected to free the *allocator,
86
-	 * e.g. page_pool, and MUST also use RCU free.
87
-	 */
88
-
89
-	/* Poison memory */
90
-	xa->mem.id = 0xFFFF;
91
-	xa->mem.type = 0xF0F0;
92
-	xa->allocator = (void *)0xDEAD9001;
93
-
9478 	kfree(xa);
9579 }
9680 
97
-static void __xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq)
81
+static void mem_xa_remove(struct xdp_mem_allocator *xa)
82
+{
83
+	trace_mem_disconnect(xa);
84
+
85
+	if (!rhashtable_remove_fast(mem_id_ht, &xa->node, mem_id_rht_params))
86
+		call_rcu(&xa->rcu, __xdp_mem_allocator_rcu_free);
87
+}
88
+
89
+static void mem_allocator_disconnect(void *allocator)
90
+{
91
+	struct xdp_mem_allocator *xa;
92
+	struct rhashtable_iter iter;
93
+
94
+	mutex_lock(&mem_id_lock);
95
+
96
+	rhashtable_walk_enter(mem_id_ht, &iter);
97
+	do {
98
+		rhashtable_walk_start(&iter);
99
+
100
+		while ((xa = rhashtable_walk_next(&iter)) && !IS_ERR(xa)) {
101
+			if (xa->allocator == allocator)
102
+				mem_xa_remove(xa);
103
+		}
104
+
105
+		rhashtable_walk_stop(&iter);
106
+
107
+	} while (xa == ERR_PTR(-EAGAIN));
108
+	rhashtable_walk_exit(&iter);
109
+
110
+	mutex_unlock(&mem_id_lock);
111
+}
112
+
113
+void xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq)
98114 {
99115 	struct xdp_mem_allocator *xa;
100116 	int id = xdp_rxq->mem.id;
101117 
118
+	if (xdp_rxq->reg_state != REG_STATE_REGISTERED) {
119
+		WARN(1, "Missing register, driver bug");
120
+		return;
121
+	}
122
+
102123 	if (id == 0)
103124 		return;
104125 
105
-	mutex_lock(&mem_id_lock);
106
-
107
-	xa = rhashtable_lookup_fast(mem_id_ht, &id, mem_id_rht_params);
108
-	if (xa && !rhashtable_remove_fast(mem_id_ht, &xa->node, mem_id_rht_params))
109
-		call_rcu(&xa->rcu, __xdp_mem_allocator_rcu_free);
110
-
111
-	mutex_unlock(&mem_id_lock);
126
+	if (xdp_rxq->mem.type == MEM_TYPE_PAGE_POOL) {
127
+		rcu_read_lock();
128
+		xa = rhashtable_lookup(mem_id_ht, &id, mem_id_rht_params);
129
+		page_pool_destroy(xa->page_pool);
130
+		rcu_read_unlock();
131
+	}
112132 }
133
+EXPORT_SYMBOL_GPL(xdp_rxq_info_unreg_mem_model);
113134 
114135 void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq)
115136 {
....@@ -119,7 +140,7 @@
119140 
120141 	WARN(!(xdp_rxq->reg_state == REG_STATE_REGISTERED), "Driver BUG");
121142 
122
-	__xdp_rxq_info_unreg_mem_model(xdp_rxq);
143
+	xdp_rxq_info_unreg_mem_model(xdp_rxq);
123144 
124145 	xdp_rxq->reg_state = REG_STATE_UNREGISTERED;
125146 	xdp_rxq->dev = NULL;
....@@ -257,7 +278,7 @@
257278 	xdp_rxq->mem.type = type;
258279 
259280 	if (!allocator) {
260
-		if (type == MEM_TYPE_PAGE_POOL || type == MEM_TYPE_ZERO_COPY)
281
+		if (type == MEM_TYPE_PAGE_POOL)
261282 			return -EINVAL; /* Setup time check page_pool req */
262283 		return 0;
263284 	}
....@@ -290,12 +311,18 @@
290311 	/* Insert allocator into ID lookup table */
291312 	ptr = rhashtable_insert_slow(mem_id_ht, &id, &xdp_alloc->node);
292313 	if (IS_ERR(ptr)) {
314
+		ida_simple_remove(&mem_id_pool, xdp_rxq->mem.id);
315
+		xdp_rxq->mem.id = 0;
293316 		errno = PTR_ERR(ptr);
294317 		goto err;
295318 	}
296319 
320
+	if (type == MEM_TYPE_PAGE_POOL)
321
+		page_pool_use_xdp_mem(allocator, mem_allocator_disconnect);
322
+
297323 	mutex_unlock(&mem_id_lock);
298324 
325
+	trace_mem_connect(xdp_alloc, xdp_rxq);
299326 	return 0;
300327 err:
301328 	mutex_unlock(&mem_id_lock);
....@@ -306,12 +333,12 @@
306333 
307334 /* XDP RX runs under NAPI protection, and in different delivery error
308335  * scenarios (e.g. queue full), it is possible to return the xdp_frame
309
- * while still leveraging this protection.  The @napi_direct boolian
336
+ * while still leveraging this protection.  The @napi_direct boolean
310337  * is used for those calls sites.  Thus, allowing for faster recycling
311338  * of xdp_frames/pages in those cases.
312339  */
313340 static void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct,
314
-			 unsigned long handle)
341
+			 struct xdp_buff *xdp)
315342 {
316343 	struct xdp_mem_allocator *xa;
317344 	struct page *page;
....@@ -322,12 +349,9 @@
322349 		/* mem->id is valid, checked in xdp_rxq_info_reg_mem_model() */
323350 		xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params);
324351 		page = virt_to_head_page(data);
325
-		if (xa) {
326
-			napi_direct &= !xdp_return_frame_no_direct();
327
-			page_pool_put_page(xa->page_pool, page, napi_direct);
328
-		} else {
329
-			put_page(page);
330
-		}
352
+		if (napi_direct && xdp_return_frame_no_direct())
353
+			napi_direct = false;
354
+		page_pool_put_full_page(xa->page_pool, page, napi_direct);
331355 		rcu_read_unlock();
332356 		break;
333357 	case MEM_TYPE_PAGE_SHARED:
....@@ -337,57 +361,48 @@
337361 		page = virt_to_page(data); /* Assumes order0 page*/
338362 		put_page(page);
339363 		break;
340
-	case MEM_TYPE_ZERO_COPY:
364
+	case MEM_TYPE_XSK_BUFF_POOL:
341365 		/* NB! Only valid from an xdp_buff! */
342
-		rcu_read_lock();
343
-		/* mem->id is valid, checked in xdp_rxq_info_reg_mem_model() */
344
-		xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params);
345
-		xa->zc_alloc->free(xa->zc_alloc, handle);
346
-		rcu_read_unlock();
366
+		xsk_buff_free(xdp);
367
+		break;
347368 	default:
348369 		/* Not possible, checked in xdp_rxq_info_reg_mem_model() */
370
+		WARN(1, "Incorrect XDP memory type (%d) usage", mem->type);
349371 		break;
350372 	}
351373 }
352374 
353375 void xdp_return_frame(struct xdp_frame *xdpf)
354376 {
355
-	__xdp_return(xdpf->data, &xdpf->mem, false, 0);
377
+	__xdp_return(xdpf->data, &xdpf->mem, false, NULL);
356378 }
357379 EXPORT_SYMBOL_GPL(xdp_return_frame);
358380 
359381 void xdp_return_frame_rx_napi(struct xdp_frame *xdpf)
360382 {
361
-	__xdp_return(xdpf->data, &xdpf->mem, true, 0);
383
+	__xdp_return(xdpf->data, &xdpf->mem, true, NULL);
362384 }
363385 EXPORT_SYMBOL_GPL(xdp_return_frame_rx_napi);
364386 
365387 void xdp_return_buff(struct xdp_buff *xdp)
366388 {
367
-	__xdp_return(xdp->data, &xdp->rxq->mem, true, xdp->handle);
389
+	__xdp_return(xdp->data, &xdp->rxq->mem, true, xdp);
368390 }
369
-EXPORT_SYMBOL_GPL(xdp_return_buff);
370391 
371
-int xdp_attachment_query(struct xdp_attachment_info *info,
372
-			 struct netdev_bpf *bpf)
392
+/* Only called for MEM_TYPE_PAGE_POOL see xdp.h */
393
+void __xdp_release_frame(void *data, struct xdp_mem_info *mem)
373394 {
374
-	bpf->prog_id = info->prog ? info->prog->aux->id : 0;
375
-	bpf->prog_flags = info->prog ? info->flags : 0;
376
-	return 0;
377
-}
378
-EXPORT_SYMBOL_GPL(xdp_attachment_query);
395
+	struct xdp_mem_allocator *xa;
396
+	struct page *page;
379397 
380
-bool xdp_attachment_flags_ok(struct xdp_attachment_info *info,
381
-			     struct netdev_bpf *bpf)
382
-{
383
-	if (info->prog && (bpf->flags ^ info->flags) & XDP_FLAGS_MODES) {
384
-		NL_SET_ERR_MSG(bpf->extack,
385
-			       "program loaded with different flags");
386
-		return false;
387
-	}
388
-	return true;
398
+	rcu_read_lock();
399
+	xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params);
400
+	page = virt_to_head_page(data);
401
+	if (xa)
402
+		page_pool_release_page(xa->page_pool, page);
403
+	rcu_read_unlock();
389404 }
390
-EXPORT_SYMBOL_GPL(xdp_attachment_flags_ok);
405
+EXPORT_SYMBOL_GPL(__xdp_release_frame);
391406 
392407 void xdp_attachment_setup(struct xdp_attachment_info *info,
393408 			  struct netdev_bpf *bpf)
....@@ -398,3 +413,49 @@
398413 	info->flags = bpf->flags;
399414 }
400415 EXPORT_SYMBOL_GPL(xdp_attachment_setup);
416
+
417
+struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp)
418
+{
419
+	unsigned int metasize, totsize;
420
+	void *addr, *data_to_copy;
421
+	struct xdp_frame *xdpf;
422
+	struct page *page;
423
+
424
+	/* Clone into a MEM_TYPE_PAGE_ORDER0 xdp_frame. */
425
+	metasize = xdp_data_meta_unsupported(xdp) ? 0 :
426
+		   xdp->data - xdp->data_meta;
427
+	totsize = xdp->data_end - xdp->data + metasize;
428
+
429
+	if (sizeof(*xdpf) + totsize > PAGE_SIZE)
430
+		return NULL;
431
+
432
+	page = dev_alloc_page();
433
+	if (!page)
434
+		return NULL;
435
+
436
+	addr = page_to_virt(page);
437
+	xdpf = addr;
438
+	memset(xdpf, 0, sizeof(*xdpf));
439
+
440
+	addr += sizeof(*xdpf);
441
+	data_to_copy = metasize ? xdp->data_meta : xdp->data;
442
+	memcpy(addr, data_to_copy, totsize);
443
+
444
+	xdpf->data = addr + metasize;
445
+	xdpf->len = totsize - metasize;
446
+	xdpf->headroom = 0;
447
+	xdpf->metasize = metasize;
448
+	xdpf->frame_sz = PAGE_SIZE;
449
+	xdpf->mem.type = MEM_TYPE_PAGE_ORDER0;
450
+
451
+	xsk_buff_free(xdp);
452
+	return xdpf;
453
+}
454
+EXPORT_SYMBOL_GPL(xdp_convert_zc_to_xdp_frame);
455
+
456
+/* Used by XDP_WARN macro, to avoid inlining WARN() in fast-path */
457
+void xdp_warn(const char *msg, const char *func, const int line)
458
+{
459
+	WARN(1, "XDP_WARN: %s(line:%d): %s\n", func, line, msg);
460
+};
461
+EXPORT_SYMBOL_GPL(xdp_warn);