[mirror_ubuntu-eoan-kernel.git] / drivers / net / ethernet / aquantia / atlantic / aq_ring.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * aQuantia Corporation Network Driver
 * Copyright (C) 2014-2017 aQuantia Corporation. All rights reserved
 */

/* File aq_ring.c: Definition of functions for Rx/Tx rings. */

#include "aq_ring.h"
#include "aq_nic.h"
#include "aq_hw.h"
#include "aq_hw_utils.h"

#include <linux/netdevice.h>
#include <linux/etherdevice.h>

static inline void aq_free_rxpage(struct aq_rxpage *rxpage, struct device *dev)
{
	unsigned int len = PAGE_SIZE << rxpage->order;

	dma_unmap_page(dev, rxpage->daddr, len, DMA_FROM_DEVICE);

	/* Drop the ref for being in the ring. */
	__free_pages(rxpage->page, rxpage->order);
	rxpage->page = NULL;
}

static int aq_get_rxpage(struct aq_rxpage *rxpage, unsigned int order,
			 struct device *dev)
{
	struct page *page;
	dma_addr_t daddr;
	int ret = -ENOMEM;

	page = dev_alloc_pages(order);
	if (unlikely(!page))
		goto err_exit;

	daddr = dma_map_page(dev, page, 0, PAGE_SIZE << order,
			     DMA_FROM_DEVICE);

	if (unlikely(dma_mapping_error(dev, daddr)))
		goto free_page;

	rxpage->page = page;
	rxpage->daddr = daddr;
	rxpage->order = order;
	rxpage->pg_off = 0;

	return 0;

free_page:
	__free_pages(page, order);

err_exit:
	return ret;
}

static int aq_get_rxpages(struct aq_ring_s *self, struct aq_ring_buff_s *rxbuf,
			  int order)
{
	int ret;

	if (rxbuf->rxdata.page) {
		/* One means ring is the only user and can reuse */
		if (page_ref_count(rxbuf->rxdata.page) > 1) {
			/* Try reuse buffer */
			rxbuf->rxdata.pg_off += AQ_CFG_RX_FRAME_MAX;
			if (rxbuf->rxdata.pg_off + AQ_CFG_RX_FRAME_MAX <=
				(PAGE_SIZE << order)) {
				self->stats.rx.pg_flips++;
			} else {
				/* Buffer exhausted. We have other users and
				 * should release this page and realloc
				 */
				aq_free_rxpage(&rxbuf->rxdata,
					       aq_nic_get_dev(self->aq_nic));
				self->stats.rx.pg_losts++;
			}
		} else {
			rxbuf->rxdata.pg_off = 0;
			self->stats.rx.pg_reuses++;
		}
	}

	if (!rxbuf->rxdata.page) {
		ret = aq_get_rxpage(&rxbuf->rxdata, order,
				    aq_nic_get_dev(self->aq_nic));
		return ret;
	}

	return 0;
}

static struct aq_ring_s *aq_ring_alloc(struct aq_ring_s *self,
				       struct aq_nic_s *aq_nic)
{
	int err = 0;

	self->buff_ring =
		kcalloc(self->size, sizeof(struct aq_ring_buff_s), GFP_KERNEL);

	if (!self->buff_ring) {
		err = -ENOMEM;
		goto err_exit;
	}
	self->dx_ring = dma_alloc_coherent(aq_nic_get_dev(aq_nic),
					   self->size * self->dx_size,
					   &self->dx_ring_pa, GFP_KERNEL);
	if (!self->dx_ring) {
		err = -ENOMEM;
		goto err_exit;
	}

err_exit:
	if (err < 0) {
		aq_ring_free(self);
		self = NULL;
	}
	return self;
}

struct aq_ring_s *aq_ring_tx_alloc(struct aq_ring_s *self,
				   struct aq_nic_s *aq_nic,
				   unsigned int idx,
				   struct aq_nic_cfg_s *aq_nic_cfg)
{
	int err = 0;

	self->aq_nic = aq_nic;
	self->idx = idx;
	self->size = aq_nic_cfg->txds;
	self->dx_size = aq_nic_cfg->aq_hw_caps->txd_size;

	self = aq_ring_alloc(self, aq_nic);
	if (!self) {
		err = -ENOMEM;
		goto err_exit;
	}

err_exit:
	if (err < 0) {
		aq_ring_free(self);
		self = NULL;
	}
	return self;
}

struct aq_ring_s *aq_ring_rx_alloc(struct aq_ring_s *self,
				   struct aq_nic_s *aq_nic,
				   unsigned int idx,
				   struct aq_nic_cfg_s *aq_nic_cfg)
{
	int err = 0;

	self->aq_nic = aq_nic;
	self->idx = idx;
	self->size = aq_nic_cfg->rxds;
	self->dx_size = aq_nic_cfg->aq_hw_caps->rxd_size;
	self->page_order = fls(AQ_CFG_RX_FRAME_MAX / PAGE_SIZE +
			       (AQ_CFG_RX_FRAME_MAX % PAGE_SIZE ? 1 : 0)) - 1;

	if (aq_nic_cfg->rxpageorder > self->page_order)
		self->page_order = aq_nic_cfg->rxpageorder;

	self = aq_ring_alloc(self, aq_nic);
	if (!self) {
		err = -ENOMEM;
		goto err_exit;
	}

err_exit:
	if (err < 0) {
		aq_ring_free(self);
		self = NULL;
	}
	return self;
}

int aq_ring_init(struct aq_ring_s *self)
{
	self->hw_head = 0;
	self->sw_head = 0;
	self->sw_tail = 0;
	return 0;
}

static inline bool aq_ring_dx_in_range(unsigned int h, unsigned int i,
				       unsigned int t)
{
	return (h < t) ? ((h < i) && (i < t)) : ((h < i) || (i < t));
}

void aq_ring_update_queue_state(struct aq_ring_s *ring)
{
	if (aq_ring_avail_dx(ring) <= AQ_CFG_SKB_FRAGS_MAX)
		aq_ring_queue_stop(ring);
	else if (aq_ring_avail_dx(ring) > AQ_CFG_RESTART_DESC_THRES)
		aq_ring_queue_wake(ring);
}

void aq_ring_queue_wake(struct aq_ring_s *ring)
{
	struct net_device *ndev = aq_nic_get_ndev(ring->aq_nic);

	if (__netif_subqueue_stopped(ndev, ring->idx)) {
		netif_wake_subqueue(ndev, ring->idx);
		ring->stats.tx.queue_restarts++;
	}
}

void aq_ring_queue_stop(struct aq_ring_s *ring)
{
	struct net_device *ndev = aq_nic_get_ndev(ring->aq_nic);

	if (!__netif_subqueue_stopped(ndev, ring->idx))
		netif_stop_subqueue(ndev, ring->idx);
}

bool aq_ring_tx_clean(struct aq_ring_s *self)
{
	struct device *dev = aq_nic_get_dev(self->aq_nic);
	unsigned int budget;

	for (budget = AQ_CFG_TX_CLEAN_BUDGET;
	     budget && self->sw_head != self->hw_head; budget--) {
		struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];

		if (likely(buff->is_mapped)) {
			if (unlikely(buff->is_sop)) {
				if (!buff->is_eop &&
				    buff->eop_index != 0xffffU &&
				    (!aq_ring_dx_in_range(self->sw_head,
						buff->eop_index,
						self->hw_head)))
					break;

				dma_unmap_single(dev, buff->pa, buff->len,
						 DMA_TO_DEVICE);
			} else {
				dma_unmap_page(dev, buff->pa, buff->len,
					       DMA_TO_DEVICE);
			}
		}

		if (unlikely(buff->is_eop))
			dev_kfree_skb_any(buff->skb);

		buff->pa = 0U;
		buff->eop_index = 0xffffU;
		self->sw_head = aq_ring_next_dx(self, self->sw_head);
	}

	return !!budget;
}

static void aq_rx_checksum(struct aq_ring_s *self,
			   struct aq_ring_buff_s *buff,
			   struct sk_buff *skb)
{
	if (!(self->aq_nic->ndev->features & NETIF_F_RXCSUM))
		return;

	if (unlikely(buff->is_cso_err)) {
		++self->stats.rx.errors;
		skb->ip_summed = CHECKSUM_NONE;
		return;
	}
	if (buff->is_ip_cso) {
		__skb_incr_checksum_unnecessary(skb);
	} else {
		skb->ip_summed = CHECKSUM_NONE;
	}

	if (buff->is_udp_cso || buff->is_tcp_cso)
		__skb_incr_checksum_unnecessary(skb);
}

#define AQ_SKB_ALIGN SKB_DATA_ALIGN(sizeof(struct skb_shared_info))
int aq_ring_rx_clean(struct aq_ring_s *self,
		     struct napi_struct *napi,
		     int *work_done,
		     int budget)
{
	struct net_device *ndev = aq_nic_get_ndev(self->aq_nic);
	bool is_rsc_completed = true;
	int err = 0;

	for (; (self->sw_head != self->hw_head) && budget;
		self->sw_head = aq_ring_next_dx(self, self->sw_head),
		--budget, ++(*work_done)) {
		struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
		struct aq_ring_buff_s *buff_ = NULL;
		struct sk_buff *skb = NULL;
		unsigned int next_ = 0U;
		unsigned int i = 0U;
		u16 hdr_len;

		if (buff->is_cleaned)
			continue;

		if (!buff->is_eop) {
			buff_ = buff;
			do {
				next_ = buff_->next,
				buff_ = &self->buff_ring[next_];
				is_rsc_completed =
					aq_ring_dx_in_range(self->sw_head,
							    next_,
							    self->hw_head);

				if (unlikely(!is_rsc_completed))
					break;

				buff->is_error |= buff_->is_error;

			} while (!buff_->is_eop);

			if (!is_rsc_completed) {
				err = 0;
				goto err_exit;
			}
			if (buff->is_error) {
				buff_ = buff;
				do {
					next_ = buff_->next,
					buff_ = &self->buff_ring[next_];

					buff_->is_cleaned = true;
				} while (!buff_->is_eop);

				++self->stats.rx.errors;
				continue;
			}
		}

		if (buff->is_error) {
			++self->stats.rx.errors;
			continue;
		}

		dma_sync_single_range_for_cpu(aq_nic_get_dev(self->aq_nic),
					      buff->rxdata.daddr,
					      buff->rxdata.pg_off,
					      buff->len, DMA_FROM_DEVICE);

		/* for single fragment packets use build_skb() */
		if (buff->is_eop &&
		    buff->len <= AQ_CFG_RX_FRAME_MAX - AQ_SKB_ALIGN) {
			skb = build_skb(aq_buf_vaddr(&buff->rxdata),
					AQ_CFG_RX_FRAME_MAX);
			if (unlikely(!skb)) {
				err = -ENOMEM;
				goto err_exit;
			}
			skb_put(skb, buff->len);
			page_ref_inc(buff->rxdata.page);
		} else {
			skb = napi_alloc_skb(napi, AQ_CFG_RX_HDR_SIZE);
			if (unlikely(!skb)) {
				err = -ENOMEM;
				goto err_exit;
			}

			hdr_len = buff->len;
			if (hdr_len > AQ_CFG_RX_HDR_SIZE)
				hdr_len = eth_get_headlen(skb->dev,
							  aq_buf_vaddr(&buff->rxdata),
							  AQ_CFG_RX_HDR_SIZE);

			memcpy(__skb_put(skb, hdr_len), aq_buf_vaddr(&buff->rxdata),
			       ALIGN(hdr_len, sizeof(long)));

			if (buff->len - hdr_len > 0) {
				skb_add_rx_frag(skb, 0, buff->rxdata.page,
						buff->rxdata.pg_off + hdr_len,
						buff->len - hdr_len,
						AQ_CFG_RX_FRAME_MAX);
				page_ref_inc(buff->rxdata.page);
			}

			if (!buff->is_eop) {
				buff_ = buff;
				i = 1U;
				do {
					next_ = buff_->next,
					buff_ = &self->buff_ring[next_];

					dma_sync_single_range_for_cpu(
							aq_nic_get_dev(self->aq_nic),
							buff_->rxdata.daddr,
							buff_->rxdata.pg_off,
							buff_->len,
							DMA_FROM_DEVICE);
					skb_add_rx_frag(skb, i++,
							buff_->rxdata.page,
							buff_->rxdata.pg_off,
							buff_->len,
							AQ_CFG_RX_FRAME_MAX);
					page_ref_inc(buff_->rxdata.page);
					buff_->is_cleaned = 1;

					buff->is_ip_cso &= buff_->is_ip_cso;
					buff->is_udp_cso &= buff_->is_udp_cso;
					buff->is_tcp_cso &= buff_->is_tcp_cso;
					buff->is_cso_err |= buff_->is_cso_err;

				} while (!buff_->is_eop);
			}
		}

		skb->protocol = eth_type_trans(skb, ndev);

		aq_rx_checksum(self, buff, skb);

		skb_set_hash(skb, buff->rss_hash,
			     buff->is_hash_l4 ? PKT_HASH_TYPE_L4 :
			     PKT_HASH_TYPE_NONE);

		skb_record_rx_queue(skb, self->idx);

		++self->stats.rx.packets;
		self->stats.rx.bytes += skb->len;

		napi_gro_receive(napi, skb);
	}

err_exit:
	return err;
}

int aq_ring_rx_fill(struct aq_ring_s *self)
{
	unsigned int page_order = self->page_order;
	struct aq_ring_buff_s *buff = NULL;
	int err = 0;
	int i = 0;

	if (aq_ring_avail_dx(self) < min_t(unsigned int, AQ_CFG_RX_REFILL_THRES,
					   self->size / 2))
		return err;

	for (i = aq_ring_avail_dx(self); i--;
		self->sw_tail = aq_ring_next_dx(self, self->sw_tail)) {
		buff = &self->buff_ring[self->sw_tail];

		buff->flags = 0U;
		buff->len = AQ_CFG_RX_FRAME_MAX;

		err = aq_get_rxpages(self, buff, page_order);
		if (err)
			goto err_exit;

		buff->pa = aq_buf_daddr(&buff->rxdata);
		buff = NULL;
	}

err_exit:
	return err;
}

void aq_ring_rx_deinit(struct aq_ring_s *self)
{
	if (!self)
		goto err_exit;

	for (; self->sw_head != self->sw_tail;
		self->sw_head = aq_ring_next_dx(self, self->sw_head)) {
		struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];

		aq_free_rxpage(&buff->rxdata, aq_nic_get_dev(self->aq_nic));
	}

err_exit:;
}

void aq_ring_free(struct aq_ring_s *self)
{
	if (!self)
		goto err_exit;

	kfree(self->buff_ring);

	if (self->dx_ring)
		dma_free_coherent(aq_nic_get_dev(self->aq_nic),
				  self->size * self->dx_size, self->dx_ring,
				  self->dx_ring_pa);

err_exit:;
}
Commit	Line	Data
75a6faf6	1	// SPDX-License-Identifier: GPL-2.0-only
018423e9 DV	2	/*
	3	* aQuantia Corporation Network Driver
	4	* Copyright (C) 2014-2017 aQuantia Corporation. All rights reserved
018423e9 DV	5	*/
	6
	7	/* File aq_ring.c: Definition of functions for Rx/Tx rings. */
	8
	9	#include "aq_ring.h"
	10	#include "aq_nic.h"
	11	#include "aq_hw.h"
46f4c29d	12	#include "aq_hw_utils.h"
018423e9 DV	13
	14	#include <linux/netdevice.h>
	15	#include <linux/etherdevice.h>
	16
46f4c29d IR	17	static inline void aq_free_rxpage(struct aq_rxpage rxpage, struct device dev)
	18	{
	19	unsigned int len = PAGE_SIZE << rxpage->order;
	20
	21	dma_unmap_page(dev, rxpage->daddr, len, DMA_FROM_DEVICE);
	22
	23	/* Drop the ref for being in the ring. */
	24	__free_pages(rxpage->page, rxpage->order);
	25	rxpage->page = NULL;
	26	}
	27
	28	static int aq_get_rxpage(struct aq_rxpage *rxpage, unsigned int order,
	29	struct device *dev)
	30	{
	31	struct page *page;
	32	dma_addr_t daddr;
	33	int ret = -ENOMEM;
	34
	35	page = dev_alloc_pages(order);
	36	if (unlikely(!page))
	37	goto err_exit;
	38
	39	daddr = dma_map_page(dev, page, 0, PAGE_SIZE << order,
	40	DMA_FROM_DEVICE);
	41
	42	if (unlikely(dma_mapping_error(dev, daddr)))
	43	goto free_page;
	44
	45	rxpage->page = page;
	46	rxpage->daddr = daddr;
	47	rxpage->order = order;
	48	rxpage->pg_off = 0;
	49
	50	return 0;
	51
	52	free_page:
	53	__free_pages(page, order);
	54
	55	err_exit:
	56	return ret;
	57	}
	58
	59	static int aq_get_rxpages(struct aq_ring_s self, struct aq_ring_buff_s rxbuf,
	60	int order)
	61	{
	62	int ret;
	63
	64	if (rxbuf->rxdata.page) {
	65	/* One means ring is the only user and can reuse */
	66	if (page_ref_count(rxbuf->rxdata.page) > 1) {
	67	/* Try reuse buffer */
	68	rxbuf->rxdata.pg_off += AQ_CFG_RX_FRAME_MAX;
	69	if (rxbuf->rxdata.pg_off + AQ_CFG_RX_FRAME_MAX <=
	70	(PAGE_SIZE << order)) {
	71	self->stats.rx.pg_flips++;
	72	} else {
	73	/* Buffer exhausted. We have other users and
	74	* should release this page and realloc
	75	*/
	76	aq_free_rxpage(&rxbuf->rxdata,
	77	aq_nic_get_dev(self->aq_nic));
	78	self->stats.rx.pg_losts++;
	79	}
	80	} else {
81	rxbuf->rxdata.pg_off = 0;
82	self->stats.rx.pg_reuses++;
83	}
84	}
85
86	if (!rxbuf->rxdata.page) {
87	ret = aq_get_rxpage(&rxbuf->rxdata, order,
88	aq_nic_get_dev(self->aq_nic));
89	return ret;
90	}
91
92	return 0;
93	}
94
018423e9 DV	95	static struct aq_ring_s aq_ring_alloc(struct aq_ring_s self,
	96	struct aq_nic_s *aq_nic)
	97	{
	98	int err = 0;
	99
	100	self->buff_ring =
	101	kcalloc(self->size, sizeof(struct aq_ring_buff_s), GFP_KERNEL);
	102
	103	if (!self->buff_ring) {
	104	err = -ENOMEM;
	105	goto err_exit;
	106	}
	107	self->dx_ring = dma_alloc_coherent(aq_nic_get_dev(aq_nic),
e9157848 ND	108	self->size * self->dx_size,
e9157848 ND	109	&self->dx_ring_pa, GFP_KERNEL);
018423e9 DV	110	if (!self->dx_ring) {
	111	err = -ENOMEM;
	112	goto err_exit;
	113	}
	114
	115	err_exit:
	116	if (err < 0) {
	117	aq_ring_free(self);
	118	self = NULL;
	119	}
	120	return self;
	121	}
	122
	123	struct aq_ring_s aq_ring_tx_alloc(struct aq_ring_s self,
	124	struct aq_nic_s *aq_nic,
	125	unsigned int idx,
	126	struct aq_nic_cfg_s *aq_nic_cfg)
	127	{
	128	int err = 0;
	129
	130	self->aq_nic = aq_nic;
	131	self->idx = idx;
	132	self->size = aq_nic_cfg->txds;
	133	self->dx_size = aq_nic_cfg->aq_hw_caps->txd_size;
	134
	135	self = aq_ring_alloc(self, aq_nic);
	136	if (!self) {
	137	err = -ENOMEM;
	138	goto err_exit;
	139	}
	140
	141	err_exit:
	142	if (err < 0) {
	143	aq_ring_free(self);
	144	self = NULL;
	145	}
	146	return self;
	147	}
	148
	149	struct aq_ring_s aq_ring_rx_alloc(struct aq_ring_s self,
	150	struct aq_nic_s *aq_nic,
	151	unsigned int idx,
	152	struct aq_nic_cfg_s *aq_nic_cfg)
	153	{
	154	int err = 0;
	155
	156	self->aq_nic = aq_nic;
	157	self->idx = idx;
	158	self->size = aq_nic_cfg->rxds;
	159	self->dx_size = aq_nic_cfg->aq_hw_caps->rxd_size;
46f4c29d IR	160	self->page_order = fls(AQ_CFG_RX_FRAME_MAX / PAGE_SIZE +
	161	(AQ_CFG_RX_FRAME_MAX % PAGE_SIZE ? 1 : 0)) - 1;
	162
	163	if (aq_nic_cfg->rxpageorder > self->page_order)
	164	self->page_order = aq_nic_cfg->rxpageorder;
018423e9 DV	165
	166	self = aq_ring_alloc(self, aq_nic);
	167	if (!self) {
	168	err = -ENOMEM;
	169	goto err_exit;
	170	}
	171
	172	err_exit:
	173	if (err < 0) {
	174	aq_ring_free(self);
	175	self = NULL;
	176	}
	177	return self;
	178	}
	179
	180	int aq_ring_init(struct aq_ring_s *self)
	181	{
	182	self->hw_head = 0;
	183	self->sw_head = 0;
	184	self->sw_tail = 0;
	185	return 0;
	186	}
	187
c7545689 PB	188	static inline bool aq_ring_dx_in_range(unsigned int h, unsigned int i,
	189	unsigned int t)
	190	{
	191	return (h < t) ? ((h < i) && (i < t)) : ((h < i) \|\| (i < t));
	192	}
	193
3aec6412 IR	194	void aq_ring_update_queue_state(struct aq_ring_s *ring)
	195	{
	196	if (aq_ring_avail_dx(ring) <= AQ_CFG_SKB_FRAGS_MAX)
	197	aq_ring_queue_stop(ring);
	198	else if (aq_ring_avail_dx(ring) > AQ_CFG_RESTART_DESC_THRES)
	199	aq_ring_queue_wake(ring);
	200	}
	201
	202	void aq_ring_queue_wake(struct aq_ring_s *ring)
	203	{
	204	struct net_device *ndev = aq_nic_get_ndev(ring->aq_nic);
	205
	206	if (__netif_subqueue_stopped(ndev, ring->idx)) {
	207	netif_wake_subqueue(ndev, ring->idx);
	208	ring->stats.tx.queue_restarts++;
	209	}
	210	}
	211
	212	void aq_ring_queue_stop(struct aq_ring_s *ring)
	213	{
	214	struct net_device *ndev = aq_nic_get_ndev(ring->aq_nic);
	215
	216	if (!__netif_subqueue_stopped(ndev, ring->idx))
	217	netif_stop_subqueue(ndev, ring->idx);
	218	}
	219
b647d398	220	bool aq_ring_tx_clean(struct aq_ring_s *self)
018423e9 DV	221	{
018423e9 DV	222	struct device *dev = aq_nic_get_dev(self->aq_nic);
31bafc49	223	unsigned int budget;
018423e9	224
31bafc49 IR	225	for (budget = AQ_CFG_TX_CLEAN_BUDGET;
31bafc49 IR	226	budget && self->sw_head != self->hw_head; budget--) {
018423e9 DV	227	struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
	228
	229	if (likely(buff->is_mapped)) {
c7545689 PB	230	if (unlikely(buff->is_sop)) {
	231	if (!buff->is_eop &&
	232	buff->eop_index != 0xffffU &&
	233	(!aq_ring_dx_in_range(self->sw_head,
	234	buff->eop_index,
	235	self->hw_head)))
	236	break;
	237
018423e9 DV	238	dma_unmap_single(dev, buff->pa, buff->len,
018423e9 DV	239	DMA_TO_DEVICE);
c7545689	240	} else {
018423e9 DV	241	dma_unmap_page(dev, buff->pa, buff->len,
018423e9 DV	242	DMA_TO_DEVICE);
c7545689	243	}
018423e9 DV	244	}
	245
	246	if (unlikely(buff->is_eop))
	247	dev_kfree_skb_any(buff->skb);
018423e9	248
c7545689 PB	249	buff->pa = 0U;
c7545689 PB	250	buff->eop_index = 0xffffU;
31bafc49	251	self->sw_head = aq_ring_next_dx(self, self->sw_head);
c7545689	252	}
b647d398 IR	253
b647d398 IR	254	return !!budget;
018423e9 DV	255	}
018423e9 DV	256
ad703c2b DB	257	static void aq_rx_checksum(struct aq_ring_s *self,
	258	struct aq_ring_buff_s *buff,
	259	struct sk_buff *skb)
	260	{
	261	if (!(self->aq_nic->ndev->features & NETIF_F_RXCSUM))
	262	return;
	263
	264	if (unlikely(buff->is_cso_err)) {
	265	++self->stats.rx.errors;
	266	skb->ip_summed = CHECKSUM_NONE;
	267	return;
	268	}
	269	if (buff->is_ip_cso) {
	270	__skb_incr_checksum_unnecessary(skb);
ad703c2b DB	271	} else {
	272	skb->ip_summed = CHECKSUM_NONE;
	273	}
a7faaa0c DB	274
	275	if (buff->is_udp_cso \|\| buff->is_tcp_cso)
	276	__skb_incr_checksum_unnecessary(skb);
ad703c2b DB	277	}
ad703c2b DB	278
018423e9	279	#define AQ_SKB_ALIGN SKB_DATA_ALIGN(sizeof(struct skb_shared_info))
a54df682 PB	280	int aq_ring_rx_clean(struct aq_ring_s *self,
	281	struct napi_struct *napi,
	282	int *work_done,
	283	int budget)
018423e9 DV	284	{
018423e9 DV	285	struct net_device *ndev = aq_nic_get_ndev(self->aq_nic);
018423e9	286	bool is_rsc_completed = true;
7e2698c4	287	int err = 0;
018423e9 DV	288
	289	for (; (self->sw_head != self->hw_head) && budget;
	290	self->sw_head = aq_ring_next_dx(self, self->sw_head),
	291	--budget, ++(*work_done)) {
	292	struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
7e2698c4	293	struct aq_ring_buff_s *buff_ = NULL;
018423e9 DV	294	struct sk_buff *skb = NULL;
	295	unsigned int next_ = 0U;
	296	unsigned int i = 0U;
7e2698c4	297	u16 hdr_len;
018423e9	298
018423e9 DV	299	if (buff->is_cleaned)
	300	continue;
	301
	302	if (!buff->is_eop) {
f38f1ee8 DB	303	buff_ = buff;
	304	do {
	305	next_ = buff_->next,
	306	buff_ = &self->buff_ring[next_];
018423e9 DV	307	is_rsc_completed =
	308	aq_ring_dx_in_range(self->sw_head,
	309	next_,
	310	self->hw_head);
	311
f38f1ee8	312	if (unlikely(!is_rsc_completed))
018423e9	313	break;
018423e9	314
f38f1ee8 DB	315	buff->is_error \|= buff_->is_error;
	316
	317	} while (!buff_->is_eop);
018423e9 DV	318
	319	if (!is_rsc_completed) {
	320	err = 0;
	321	goto err_exit;
	322	}
f38f1ee8 DB	323	if (buff->is_error) {
	324	buff_ = buff;
	325	do {
	326	next_ = buff_->next,
	327	buff_ = &self->buff_ring[next_];
	328
	329	buff_->is_cleaned = true;
	330	} while (!buff_->is_eop);
	331
	332	++self->stats.rx.errors;
	333	continue;
	334	}
	335	}
	336
	337	if (buff->is_error) {
	338	++self->stats.rx.errors;
	339	continue;
018423e9 DV	340	}
018423e9 DV	341
46f4c29d IR	342	dma_sync_single_range_for_cpu(aq_nic_get_dev(self->aq_nic),
	343	buff->rxdata.daddr,
	344	buff->rxdata.pg_off,
	345	buff->len, DMA_FROM_DEVICE);
	346
018423e9	347	/* for single fragment packets use build_skb() */
6f9dbadc FG	348	if (buff->is_eop &&
6f9dbadc FG	349	buff->len <= AQ_CFG_RX_FRAME_MAX - AQ_SKB_ALIGN) {
46f4c29d	350	skb = build_skb(aq_buf_vaddr(&buff->rxdata),
6f9dbadc	351	AQ_CFG_RX_FRAME_MAX);
018423e9 DV	352	if (unlikely(!skb)) {
	353	err = -ENOMEM;
	354	goto err_exit;
	355	}
018423e9	356	skb_put(skb, buff->len);
46f4c29d	357	page_ref_inc(buff->rxdata.page);
018423e9	358	} else {
7e2698c4	359	skb = napi_alloc_skb(napi, AQ_CFG_RX_HDR_SIZE);
018423e9 DV	360	if (unlikely(!skb)) {
	361	err = -ENOMEM;
	362	goto err_exit;
	363	}
018423e9	364
7e2698c4 IR	365	hdr_len = buff->len;
7e2698c4 IR	366	if (hdr_len > AQ_CFG_RX_HDR_SIZE)
c43f1255 SF	367	hdr_len = eth_get_headlen(skb->dev,
c43f1255 SF	368	aq_buf_vaddr(&buff->rxdata),
7e2698c4 IR	369	AQ_CFG_RX_HDR_SIZE);
7e2698c4 IR	370
46f4c29d	371	memcpy(__skb_put(skb, hdr_len), aq_buf_vaddr(&buff->rxdata),
7e2698c4 IR	372	ALIGN(hdr_len, sizeof(long)));
	373
	374	if (buff->len - hdr_len > 0) {
46f4c29d IR	375	skb_add_rx_frag(skb, 0, buff->rxdata.page,
46f4c29d IR	376	buff->rxdata.pg_off + hdr_len,
7e2698c4	377	buff->len - hdr_len,
46f4c29d IR	378	AQ_CFG_RX_FRAME_MAX);
46f4c29d IR	379	page_ref_inc(buff->rxdata.page);
7e2698c4	380	}
018423e9	381
6f9dbadc	382	if (!buff->is_eop) {
46f4c29d IR	383	buff_ = buff;
	384	i = 1U;
	385	do {
	386	next_ = buff_->next,
	387	buff_ = &self->buff_ring[next_];
	388
	389	dma_sync_single_range_for_cpu(
	390	aq_nic_get_dev(self->aq_nic),
	391	buff_->rxdata.daddr,
	392	buff_->rxdata.pg_off,
	393	buff_->len,
	394	DMA_FROM_DEVICE);
	395	skb_add_rx_frag(skb, i++,
	396	buff_->rxdata.page,
	397	buff_->rxdata.pg_off,
6f9dbadc	398	buff_->len,
46f4c29d IR	399	AQ_CFG_RX_FRAME_MAX);
46f4c29d IR	400	page_ref_inc(buff_->rxdata.page);
6f9dbadc	401	buff_->is_cleaned = 1;
f38f1ee8 DB	402
	403	buff->is_ip_cso &= buff_->is_ip_cso;
	404	buff->is_udp_cso &= buff_->is_udp_cso;
	405	buff->is_tcp_cso &= buff_->is_tcp_cso;
	406	buff->is_cso_err \|= buff_->is_cso_err;
	407
46f4c29d	408	} while (!buff_->is_eop);
018423e9 DV	409	}
	410	}
	411
	412	skb->protocol = eth_type_trans(skb, ndev);
ad703c2b DB	413
ad703c2b DB	414	aq_rx_checksum(self, buff, skb);
018423e9 DV	415
	416	skb_set_hash(skb, buff->rss_hash,
	417	buff->is_hash_l4 ? PKT_HASH_TYPE_L4 :
	418	PKT_HASH_TYPE_NONE);
	419
	420	skb_record_rx_queue(skb, self->idx);
	421
018423e9 DV	422	++self->stats.rx.packets;
018423e9 DV	423	self->stats.rx.bytes += skb->len;
9ec03bf6 IR	424
9ec03bf6 IR	425	napi_gro_receive(napi, skb);
018423e9 DV	426	}
	427
	428	err_exit:
	429	return err;
	430	}
	431
	432	int aq_ring_rx_fill(struct aq_ring_s *self)
	433	{
46f4c29d	434	unsigned int page_order = self->page_order;
018423e9 DV	435	struct aq_ring_buff_s *buff = NULL;
	436	int err = 0;
	437	int i = 0;
	438
9773ef18 IR	439	if (aq_ring_avail_dx(self) < min_t(unsigned int, AQ_CFG_RX_REFILL_THRES,
	440	self->size / 2))
	441	return err;
	442
018423e9 DV	443	for (i = aq_ring_avail_dx(self); i--;
	444	self->sw_tail = aq_ring_next_dx(self, self->sw_tail)) {
	445	buff = &self->buff_ring[self->sw_tail];
	446
	447	buff->flags = 0U;
	448	buff->len = AQ_CFG_RX_FRAME_MAX;
	449
46f4c29d IR	450	err = aq_get_rxpages(self, buff, page_order);
46f4c29d IR	451	if (err)
018423e9	452	goto err_exit;
018423e9	453
46f4c29d	454	buff->pa = aq_buf_daddr(&buff->rxdata);
018423e9 DV	455	buff = NULL;
018423e9 DV	456	}
018423e9 DV	457
018423e9 DV	458	err_exit:
018423e9 DV	459	return err;
	460	}
	461
	462	void aq_ring_rx_deinit(struct aq_ring_s *self)
	463	{
	464	if (!self)
	465	goto err_exit;
	466
	467	for (; self->sw_head != self->sw_tail;
	468	self->sw_head = aq_ring_next_dx(self, self->sw_head)) {
	469	struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
	470
46f4c29d	471	aq_free_rxpage(&buff->rxdata, aq_nic_get_dev(self->aq_nic));
018423e9 DV	472	}
	473
	474	err_exit:;
	475	}
	476
018423e9 DV	477	void aq_ring_free(struct aq_ring_s *self)
	478	{
	479	if (!self)
	480	goto err_exit;
	481
	482	kfree(self->buff_ring);
	483
	484	if (self->dx_ring)
	485	dma_free_coherent(aq_nic_get_dev(self->aq_nic),
	486	self->size * self->dx_size, self->dx_ring,
	487	self->dx_ring_pa);
	488
	489	err_exit:;
	490	}