1// SPDX-License-Identifier: GPL-2.0
  2/* Copyright (c) 2019, Intel Corporation. */
  3
  4#include <linux/filter.h>
  5#include <linux/net/intel/libie/rx.h>
  6
  7#include "ice_txrx_lib.h"
  8#include "ice_eswitch.h"
  9#include "ice_lib.h"
 10
 11/**
 12 * ice_release_rx_desc - Store the new tail and head values
 13 * @rx_ring: ring to bump
 14 * @val: new head index
 15 */
 16void ice_release_rx_desc(struct ice_rx_ring *rx_ring, u16 val)
 17{
 18	u16 prev_ntu = rx_ring->next_to_use & ~0x7;
 19
 20	rx_ring->next_to_use = val;
 21
 22	/* update next to alloc since we have filled the ring */
 23	rx_ring->next_to_alloc = val;
 24
 25	/* QRX_TAIL will be updated with any tail value, but hardware ignores
 26	 * the lower 3 bits. This makes it so we only bump tail on meaningful
 27	 * boundaries. Also, this allows us to bump tail on intervals of 8 up to
 28	 * the budget depending on the current traffic load.
 29	 */
 30	val &= ~0x7;
 31	if (prev_ntu != val) {
 32		/* Force memory writes to complete before letting h/w
 33		 * know there are new descriptors to fetch. (Only
 34		 * applicable for weak-ordered memory model archs,
 35		 * such as IA-64).
 36		 */
 37		wmb();
 38		writel(val, rx_ring->tail);
 39	}
 40}
 41
 42/**
 43 * ice_get_rx_hash - get RX hash value from descriptor
 44 * @rx_desc: specific descriptor
 45 *
 46 * Returns hash, if present, 0 otherwise.
 47 */
 48static u32 ice_get_rx_hash(const union ice_32b_rx_flex_desc *rx_desc)
 49{
 50	const struct ice_32b_rx_flex_desc_nic *nic_mdid;
 51
 52	if (unlikely(rx_desc->wb.rxdid != ICE_RXDID_FLEX_NIC))
 53		return 0;
 54
 55	nic_mdid = (struct ice_32b_rx_flex_desc_nic *)rx_desc;
 56	return le32_to_cpu(nic_mdid->rss_hash);
 57}
 58
 59/**
 60 * ice_rx_hash_to_skb - set the hash value in the skb
 61 * @rx_ring: descriptor ring
 62 * @rx_desc: specific descriptor
 63 * @skb: pointer to current skb
 64 * @rx_ptype: the ptype value from the descriptor
 65 */
 66static void
 67ice_rx_hash_to_skb(const struct ice_rx_ring *rx_ring,
 68		   const union ice_32b_rx_flex_desc *rx_desc,
 69		   struct sk_buff *skb, u16 rx_ptype)
 70{
 71	struct libeth_rx_pt decoded;
 72	u32 hash;
 73
 74	decoded = libie_rx_pt_parse(rx_ptype);
 75	if (!libeth_rx_pt_has_hash(rx_ring->netdev, decoded))
 76		return;
 77
 78	hash = ice_get_rx_hash(rx_desc);
 79	if (likely(hash))
 80		libeth_rx_pt_set_hash(skb, hash, decoded);
 81}
 82
 83/**
 84 * ice_rx_csum - Indicate in skb if checksum is good
 85 * @ring: the ring we care about
 86 * @skb: skb currently being received and modified
 87 * @rx_desc: the receive descriptor
 88 * @ptype: the packet type decoded by hardware
 89 *
 90 * skb->protocol must be set before this function is called
 91 */
 92static void
 93ice_rx_csum(struct ice_rx_ring *ring, struct sk_buff *skb,
 94	    union ice_32b_rx_flex_desc *rx_desc, u16 ptype)
 95{
 96	struct libeth_rx_pt decoded;
 97	u16 rx_status0, rx_status1;
 98	bool ipv4, ipv6;
 99
100	/* Start with CHECKSUM_NONE and by default csum_level = 0 */
101	skb->ip_summed = CHECKSUM_NONE;
102
103	decoded = libie_rx_pt_parse(ptype);
104	if (!libeth_rx_pt_has_checksum(ring->netdev, decoded))
105		return;
106
107	rx_status0 = le16_to_cpu(rx_desc->wb.status_error0);
108	rx_status1 = le16_to_cpu(rx_desc->wb.status_error1);
109
110	/* check if HW has decoded the packet and checksum */
111	if (!(rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_L3L4P_S)))
112		return;
113
114	ipv4 = libeth_rx_pt_get_ip_ver(decoded) == LIBETH_RX_PT_OUTER_IPV4;
115	ipv6 = libeth_rx_pt_get_ip_ver(decoded) == LIBETH_RX_PT_OUTER_IPV6;
116
117	if (ipv4 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_EIPE_S)))) {
118		ring->vsi->back->hw_rx_eipe_error++;
119		return;
120	}
121
122	if (ipv4 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_IPE_S))))
123		goto checksum_fail;
124
125	if (ipv6 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_IPV6EXADD_S))))
126		goto checksum_fail;
127
128	/* check for L4 errors and handle packets that were not able to be
129	 * checksummed due to arrival speed
130	 */
131	if (rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_L4E_S))
132		goto checksum_fail;
133
134	/* check for outer UDP checksum error in tunneled packets */
135	if ((rx_status1 & BIT(ICE_RX_FLEX_DESC_STATUS1_NAT_S)) &&
136	    (rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_EUDPE_S)))
137		goto checksum_fail;
138
139	/* If there is an outer header present that might contain a checksum
140	 * we need to bump the checksum level by 1 to reflect the fact that
141	 * we are indicating we validated the inner checksum.
142	 */
143	if (decoded.tunnel_type >= LIBETH_RX_PT_TUNNEL_IP_GRENAT)
144		skb->csum_level = 1;
145
146	skb->ip_summed = CHECKSUM_UNNECESSARY;
147	return;
148
149checksum_fail:
150	ring->vsi->back->hw_csum_rx_error++;
151}
152
153/**
154 * ice_ptp_rx_hwts_to_skb - Put RX timestamp into skb
155 * @rx_ring: Ring to get the VSI info
156 * @rx_desc: Receive descriptor
157 * @skb: Particular skb to send timestamp with
158 *
159 * The timestamp is in ns, so we must convert the result first.
160 */
161static void
162ice_ptp_rx_hwts_to_skb(struct ice_rx_ring *rx_ring,
163		       const union ice_32b_rx_flex_desc *rx_desc,
164		       struct sk_buff *skb)
165{
166	u64 ts_ns = ice_ptp_get_rx_hwts(rx_desc, &rx_ring->pkt_ctx);
167
168	skb_hwtstamps(skb)->hwtstamp = ns_to_ktime(ts_ns);
169}
170
171/**
172 * ice_get_ptype - Read HW packet type from the descriptor
173 * @rx_desc: RX descriptor
174 */
175static u16 ice_get_ptype(const union ice_32b_rx_flex_desc *rx_desc)
176{
177	return le16_to_cpu(rx_desc->wb.ptype_flex_flags0) &
178	       ICE_RX_FLEX_DESC_PTYPE_M;
179}
180
181/**
182 * ice_process_skb_fields - Populate skb header fields from Rx descriptor
183 * @rx_ring: Rx descriptor ring packet is being transacted on
184 * @rx_desc: pointer to the EOP Rx descriptor
185 * @skb: pointer to current skb being populated
186 *
187 * This function checks the ring, descriptor, and packet information in
188 * order to populate the hash, checksum, VLAN, protocol, and
189 * other fields within the skb.
190 */
191void
192ice_process_skb_fields(struct ice_rx_ring *rx_ring,
193		       union ice_32b_rx_flex_desc *rx_desc,
194		       struct sk_buff *skb)
195{
196	u16 ptype = ice_get_ptype(rx_desc);
197
198	ice_rx_hash_to_skb(rx_ring, rx_desc, skb, ptype);
199
200	/* modifies the skb - consumes the enet header */
201	if (unlikely(rx_ring->flags & ICE_RX_FLAGS_MULTIDEV)) {
202		struct net_device *netdev = ice_eswitch_get_target(rx_ring,
203								   rx_desc);
204
205		if (ice_is_port_repr_netdev(netdev))
206			ice_repr_inc_rx_stats(netdev, skb->len);
207		skb->protocol = eth_type_trans(skb, netdev);
208	} else {
209		skb->protocol = eth_type_trans(skb, rx_ring->netdev);
210	}
211
212	ice_rx_csum(rx_ring, skb, rx_desc, ptype);
213
214	if (rx_ring->ptp_rx)
215		ice_ptp_rx_hwts_to_skb(rx_ring, rx_desc, skb);
216}
217
218/**
219 * ice_receive_skb - Send a completed packet up the stack
220 * @rx_ring: Rx ring in play
221 * @skb: packet to send up
222 * @vlan_tci: VLAN TCI for packet
223 *
224 * This function sends the completed packet (via. skb) up the stack using
225 * gro receive functions (with/without VLAN tag)
226 */
227void
228ice_receive_skb(struct ice_rx_ring *rx_ring, struct sk_buff *skb, u16 vlan_tci)
229{
230	if ((vlan_tci & VLAN_VID_MASK) && rx_ring->vlan_proto)
231		__vlan_hwaccel_put_tag(skb, rx_ring->vlan_proto,
232				       vlan_tci);
233
234	napi_gro_receive(&rx_ring->q_vector->napi, skb);
235}
236
237/**
238 * ice_clean_xdp_tx_buf - Free and unmap XDP Tx buffer
239 * @dev: device for DMA mapping
240 * @tx_buf: Tx buffer to clean
241 * @bq: XDP bulk flush struct
242 */
243static void
244ice_clean_xdp_tx_buf(struct device *dev, struct ice_tx_buf *tx_buf,
245		     struct xdp_frame_bulk *bq)
246{
247	dma_unmap_single(dev, dma_unmap_addr(tx_buf, dma),
248			 dma_unmap_len(tx_buf, len), DMA_TO_DEVICE);
249	dma_unmap_len_set(tx_buf, len, 0);
250
251	switch (tx_buf->type) {
252	case ICE_TX_BUF_XDP_TX:
253		page_frag_free(tx_buf->raw_buf);
254		break;
255	case ICE_TX_BUF_XDP_XMIT:
256		xdp_return_frame_bulk(tx_buf->xdpf, bq);
257		break;
258	}
259
260	tx_buf->type = ICE_TX_BUF_EMPTY;
261}
262
263/**
264 * ice_clean_xdp_irq - Reclaim resources after transmit completes on XDP ring
265 * @xdp_ring: XDP ring to clean
266 */
267static u32 ice_clean_xdp_irq(struct ice_tx_ring *xdp_ring)
268{
269	int total_bytes = 0, total_pkts = 0;
270	struct device *dev = xdp_ring->dev;
271	u32 ntc = xdp_ring->next_to_clean;
272	struct ice_tx_desc *tx_desc;
273	u32 cnt = xdp_ring->count;
274	struct xdp_frame_bulk bq;
275	u32 frags, xdp_tx = 0;
276	u32 ready_frames = 0;
277	u32 idx;
278	u32 ret;
279
280	idx = xdp_ring->tx_buf[ntc].rs_idx;
281	tx_desc = ICE_TX_DESC(xdp_ring, idx);
282	if (tx_desc->cmd_type_offset_bsz &
283	    cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE)) {
284		if (idx >= ntc)
285			ready_frames = idx - ntc + 1;
286		else
287			ready_frames = idx + cnt - ntc + 1;
288	}
289
290	if (unlikely(!ready_frames))
291		return 0;
292	ret = ready_frames;
293
294	xdp_frame_bulk_init(&bq);
295	rcu_read_lock(); /* xdp_return_frame_bulk() */
296
297	while (ready_frames) {
298		struct ice_tx_buf *tx_buf = &xdp_ring->tx_buf[ntc];
299		struct ice_tx_buf *head = tx_buf;
300
301		/* bytecount holds size of head + frags */
302		total_bytes += tx_buf->bytecount;
303		frags = tx_buf->nr_frags;
304		total_pkts++;
305		/* count head + frags */
306		ready_frames -= frags + 1;
307		xdp_tx++;
308
309		ntc++;
310		if (ntc == cnt)
311			ntc = 0;
312
313		for (int i = 0; i < frags; i++) {
314			tx_buf = &xdp_ring->tx_buf[ntc];
315
316			ice_clean_xdp_tx_buf(dev, tx_buf, &bq);
317			ntc++;
318			if (ntc == cnt)
319				ntc = 0;
320		}
321
322		ice_clean_xdp_tx_buf(dev, head, &bq);
323	}
324
325	xdp_flush_frame_bulk(&bq);
326	rcu_read_unlock();
327
328	tx_desc->cmd_type_offset_bsz = 0;
329	xdp_ring->next_to_clean = ntc;
330	xdp_ring->xdp_tx_active -= xdp_tx;
331	ice_update_tx_ring_stats(xdp_ring, total_pkts, total_bytes);
332
333	return ret;
334}
335
336/**
337 * __ice_xmit_xdp_ring - submit frame to XDP ring for transmission
338 * @xdp: XDP buffer to be placed onto Tx descriptors
339 * @xdp_ring: XDP ring for transmission
340 * @frame: whether this comes from .ndo_xdp_xmit()
341 */
342int __ice_xmit_xdp_ring(struct xdp_buff *xdp, struct ice_tx_ring *xdp_ring,
343			bool frame)
344{
345	struct skb_shared_info *sinfo = NULL;
346	u32 size = xdp->data_end - xdp->data;
347	struct device *dev = xdp_ring->dev;
348	u32 ntu = xdp_ring->next_to_use;
349	struct ice_tx_desc *tx_desc;
350	struct ice_tx_buf *tx_head;
351	struct ice_tx_buf *tx_buf;
352	u32 cnt = xdp_ring->count;
353	void *data = xdp->data;
354	u32 nr_frags = 0;
355	u32 free_space;
356	u32 frag = 0;
357
358	free_space = ICE_DESC_UNUSED(xdp_ring);
359	if (free_space < ICE_RING_QUARTER(xdp_ring))
360		free_space += ice_clean_xdp_irq(xdp_ring);
361
362	if (unlikely(!free_space))
363		goto busy;
364
365	if (unlikely(xdp_buff_has_frags(xdp))) {
366		sinfo = xdp_get_shared_info_from_buff(xdp);
367		nr_frags = sinfo->nr_frags;
368		if (free_space < nr_frags + 1)
369			goto busy;
370	}
371
372	tx_desc = ICE_TX_DESC(xdp_ring, ntu);
373	tx_head = &xdp_ring->tx_buf[ntu];
374	tx_buf = tx_head;
375
376	for (;;) {
377		dma_addr_t dma;
378
379		dma = dma_map_single(dev, data, size, DMA_TO_DEVICE);
380		if (dma_mapping_error(dev, dma))
381			goto dma_unmap;
382
383		/* record length, and DMA address */
384		dma_unmap_len_set(tx_buf, len, size);
385		dma_unmap_addr_set(tx_buf, dma, dma);
386
387		if (frame) {
388			tx_buf->type = ICE_TX_BUF_FRAG;
389		} else {
390			tx_buf->type = ICE_TX_BUF_XDP_TX;
391			tx_buf->raw_buf = data;
392		}
393
394		tx_desc->buf_addr = cpu_to_le64(dma);
395		tx_desc->cmd_type_offset_bsz = ice_build_ctob(0, 0, size, 0);
396
397		ntu++;
398		if (ntu == cnt)
399			ntu = 0;
400
401		if (frag == nr_frags)
402			break;
403
404		tx_desc = ICE_TX_DESC(xdp_ring, ntu);
405		tx_buf = &xdp_ring->tx_buf[ntu];
406
407		data = skb_frag_address(&sinfo->frags[frag]);
408		size = skb_frag_size(&sinfo->frags[frag]);
409		frag++;
410	}
411
412	/* store info about bytecount and frag count in first desc */
413	tx_head->bytecount = xdp_get_buff_len(xdp);
414	tx_head->nr_frags = nr_frags;
415
416	if (frame) {
417		tx_head->type = ICE_TX_BUF_XDP_XMIT;
418		tx_head->xdpf = xdp->data_hard_start;
419	}
420
421	/* update last descriptor from a frame with EOP */
422	tx_desc->cmd_type_offset_bsz |=
423		cpu_to_le64(ICE_TX_DESC_CMD_EOP << ICE_TXD_QW1_CMD_S);
424
425	xdp_ring->xdp_tx_active++;
426	xdp_ring->next_to_use = ntu;
427
428	return ICE_XDP_TX;
429
430dma_unmap:
431	for (;;) {
432		tx_buf = &xdp_ring->tx_buf[ntu];
433		dma_unmap_page(dev, dma_unmap_addr(tx_buf, dma),
434			       dma_unmap_len(tx_buf, len), DMA_TO_DEVICE);
435		dma_unmap_len_set(tx_buf, len, 0);
436		if (tx_buf == tx_head)
437			break;
438
439		if (!ntu)
440			ntu += cnt;
441		ntu--;
442	}
443	return ICE_XDP_CONSUMED;
444
445busy:
446	xdp_ring->ring_stats->tx_stats.tx_busy++;
447
448	return ICE_XDP_CONSUMED;
449}
450
451/**
452 * ice_finalize_xdp_rx - Bump XDP Tx tail and/or flush redirect map
453 * @xdp_ring: XDP ring
454 * @xdp_res: Result of the receive batch
455 * @first_idx: index to write from caller
456 *
457 * This function bumps XDP Tx tail and/or flush redirect map, and
458 * should be called when a batch of packets has been processed in the
459 * napi loop.
460 */
461void ice_finalize_xdp_rx(struct ice_tx_ring *xdp_ring, unsigned int xdp_res,
462			 u32 first_idx)
463{
464	struct ice_tx_buf *tx_buf = &xdp_ring->tx_buf[first_idx];
465
466	if (xdp_res & ICE_XDP_REDIR)
467		xdp_do_flush();
468
469	if (xdp_res & ICE_XDP_TX) {
470		if (static_branch_unlikely(&ice_xdp_locking_key))
471			spin_lock(&xdp_ring->tx_lock);
472		/* store index of descriptor with RS bit set in the first
473		 * ice_tx_buf of given NAPI batch
474		 */
475		tx_buf->rs_idx = ice_set_rs_bit(xdp_ring);
476		ice_xdp_ring_update_tail(xdp_ring);
477		if (static_branch_unlikely(&ice_xdp_locking_key))
478			spin_unlock(&xdp_ring->tx_lock);
479	}
480}
481
482/**
483 * ice_xdp_rx_hw_ts - HW timestamp XDP hint handler
484 * @ctx: XDP buff pointer
485 * @ts_ns: destination address
486 *
487 * Copy HW timestamp (if available) to the destination address.
488 */
489static int ice_xdp_rx_hw_ts(const struct xdp_md *ctx, u64 *ts_ns)
490{
491	const struct ice_xdp_buff *xdp_ext = (void *)ctx;
492
493	*ts_ns = ice_ptp_get_rx_hwts(xdp_ext->eop_desc,
494				     xdp_ext->pkt_ctx);
495	if (!*ts_ns)
496		return -ENODATA;
497
498	return 0;
499}
500
501/**
502 * ice_xdp_rx_hash_type - Get XDP-specific hash type from the RX descriptor
503 * @eop_desc: End of Packet descriptor
504 */
505static enum xdp_rss_hash_type
506ice_xdp_rx_hash_type(const union ice_32b_rx_flex_desc *eop_desc)
507{
508	return libie_rx_pt_parse(ice_get_ptype(eop_desc)).hash_type;
509}
510
511/**
512 * ice_xdp_rx_hash - RX hash XDP hint handler
513 * @ctx: XDP buff pointer
514 * @hash: hash destination address
515 * @rss_type: XDP hash type destination address
516 *
517 * Copy RX hash (if available) and its type to the destination address.
518 */
519static int ice_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,
520			   enum xdp_rss_hash_type *rss_type)
521{
522	const struct ice_xdp_buff *xdp_ext = (void *)ctx;
523
524	*hash = ice_get_rx_hash(xdp_ext->eop_desc);
525	*rss_type = ice_xdp_rx_hash_type(xdp_ext->eop_desc);
526	if (!likely(*hash))
527		return -ENODATA;
528
529	return 0;
530}
531
532/**
533 * ice_xdp_rx_vlan_tag - VLAN tag XDP hint handler
534 * @ctx: XDP buff pointer
535 * @vlan_proto: destination address for VLAN protocol
536 * @vlan_tci: destination address for VLAN TCI
537 *
538 * Copy VLAN tag (if was stripped) and corresponding protocol
539 * to the destination address.
540 */
541static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, __be16 *vlan_proto,
542			       u16 *vlan_tci)
543{
544	const struct ice_xdp_buff *xdp_ext = (void *)ctx;
545
546	*vlan_proto = xdp_ext->pkt_ctx->vlan_proto;
547	if (!*vlan_proto)
548		return -ENODATA;
549
550	*vlan_tci = ice_get_vlan_tci(xdp_ext->eop_desc);
551	if (!*vlan_tci)
552		return -ENODATA;
553
554	return 0;
555}
556
557const struct xdp_metadata_ops ice_xdp_md_ops = {
558	.xmo_rx_timestamp		= ice_xdp_rx_hw_ts,
559	.xmo_rx_hash			= ice_xdp_rx_hash,
560	.xmo_rx_vlan_tag		= ice_xdp_rx_vlan_tag,
561};