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

/*
 * aQuantia Corporation Network Driver
 * Copyright (C) 2014-2017 aQuantia Corporation. All rights reserved
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 */

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

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

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

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 = 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;
	spin_lock_init(&self->header.lock);
	return 0;
}

void aq_ring_tx_clean(struct aq_ring_s *self)
{
	struct device *dev = aq_nic_get_dev(self->aq_nic);

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

		if (likely(buff->is_mapped)) {
			if (unlikely(buff->is_sop))
				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);
	}
}

static inline unsigned int 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));
}

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

	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 sk_buff *skb = NULL;
		unsigned int next_ = 0U;
		unsigned int i = 0U;
		struct aq_ring_buff_s *buff_ = NULL;

		if (buff->is_error) {
			__free_pages(buff->page, 0);
			continue;
		}

		if (buff->is_cleaned)
			continue;

		if (!buff->is_eop) {
			for (next_ = buff->next,
			     buff_ = &self->buff_ring[next_]; true;
			     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)) {
					is_rsc_completed = false;
					break;
				}

				if (buff_->is_eop)
					break;
			}

			if (!is_rsc_completed) {
				err = 0;
				goto err_exit;
			}
		}

		/* for single fragment packets use build_skb() */
		if (buff->is_eop) {
			skb = build_skb(page_address(buff->page),
					buff->len + AQ_SKB_ALIGN);
			if (unlikely(!skb)) {
				err = -ENOMEM;
				goto err_exit;
			}

			skb_put(skb, buff->len);
		} else {
			skb = netdev_alloc_skb(ndev, ETH_HLEN);
			if (unlikely(!skb)) {
				err = -ENOMEM;
				goto err_exit;
			}
			skb_put(skb, ETH_HLEN);
			memcpy(skb->data, page_address(buff->page), ETH_HLEN);

			skb_add_rx_frag(skb, 0, buff->page, ETH_HLEN,
					buff->len - ETH_HLEN,
					SKB_TRUESIZE(buff->len - ETH_HLEN));

			for (i = 1U, next_ = buff->next,
			     buff_ = &self->buff_ring[next_]; true;
			     next_ = buff_->next,
			     buff_ = &self->buff_ring[next_], ++i) {
				skb_add_rx_frag(skb, i, buff_->page, 0,
						buff_->len,
						SKB_TRUESIZE(buff->len -
						ETH_HLEN));
				buff_->is_cleaned = 1;

				if (buff_->is_eop)
					break;
			}
		}

		skb->protocol = eth_type_trans(skb, ndev);
		if (unlikely(buff->is_cso_err)) {
			++self->stats.rx.errors;
			__skb_mark_checksum_bad(skb);
		} else {
			if (buff->is_ip_cso) {
				__skb_incr_checksum_unnecessary(skb);
				if (buff->is_udp_cso || buff->is_tcp_cso)
					__skb_incr_checksum_unnecessary(skb);
			} else {
				skb->ip_summed = CHECKSUM_NONE;
			}
		}

		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);

		netif_receive_skb(skb);

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

err_exit:
	return err;
}

int aq_ring_rx_fill(struct aq_ring_s *self)
{
	unsigned int pages_order = fls(AQ_CFG_RX_FRAME_MAX / PAGE_SIZE +
		(AQ_CFG_RX_FRAME_MAX % PAGE_SIZE ? 1 : 0)) - 1;
	struct aq_ring_buff_s *buff = NULL;
	int err = 0;
	int i = 0;

	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;

		buff->page = alloc_pages(GFP_ATOMIC | __GFP_COLD |
					 __GFP_COMP, pages_order);
		if (!buff->page) {
			err = -ENOMEM;
			goto err_exit;
		}

		buff->pa = dma_map_page(aq_nic_get_dev(self->aq_nic),
					buff->page, 0,
					AQ_CFG_RX_FRAME_MAX, DMA_FROM_DEVICE);

		if (dma_mapping_error(aq_nic_get_dev(self->aq_nic), buff->pa)) {
			err = -ENOMEM;
			goto err_exit;
		}

		buff = NULL;
	}

err_exit:
	if (err < 0) {
		if (buff && buff->page)
			__free_pages(buff->page, 0);
	}

	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];

		dma_unmap_page(aq_nic_get_dev(self->aq_nic), buff->pa,
			       AQ_CFG_RX_FRAME_MAX, DMA_FROM_DEVICE);

		__free_pages(buff->page, 0);
	}

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
018423e9 DV	1	/*
	2	* aQuantia Corporation Network Driver
	3	* Copyright (C) 2014-2017 aQuantia Corporation. All rights reserved
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms and conditions of the GNU General Public License,
	7	* version 2, as published by the Free Software Foundation.
	8	*/
	9
	10	/* File aq_ring.c: Definition of functions for Rx/Tx rings. */
	11
	12	#include "aq_ring.h"
	13	#include "aq_nic.h"
	14	#include "aq_hw.h"
	15
	16	#include <linux/netdevice.h>
	17	#include <linux/etherdevice.h>
	18
	19	static struct aq_ring_s aq_ring_alloc(struct aq_ring_s self,
	20	struct aq_nic_s *aq_nic)
	21	{
	22	int err = 0;
	23
	24	self->buff_ring =
	25	kcalloc(self->size, sizeof(struct aq_ring_buff_s), GFP_KERNEL);
	26
	27	if (!self->buff_ring) {
	28	err = -ENOMEM;
	29	goto err_exit;
	30	}
	31	self->dx_ring = dma_alloc_coherent(aq_nic_get_dev(aq_nic),
	32	self->size * self->dx_size,
	33	&self->dx_ring_pa, GFP_KERNEL);
	34	if (!self->dx_ring) {
	35	err = -ENOMEM;
	36	goto err_exit;
	37	}
	38
	39	err_exit:
	40	if (err < 0) {
	41	aq_ring_free(self);
	42	self = NULL;
	43	}
	44	return self;
	45	}
	46
	47	struct aq_ring_s aq_ring_tx_alloc(struct aq_ring_s self,
	48	struct aq_nic_s *aq_nic,
	49	unsigned int idx,
	50	struct aq_nic_cfg_s *aq_nic_cfg)
	51	{
	52	int err = 0;
	53
	54	self->aq_nic = aq_nic;
	55	self->idx = idx;
	56	self->size = aq_nic_cfg->txds;
	57	self->dx_size = aq_nic_cfg->aq_hw_caps->txd_size;
	58
	59	self = aq_ring_alloc(self, aq_nic);
	60	if (!self) {
	61	err = -ENOMEM;
	62	goto err_exit;
	63	}
	64
65	err_exit:
66	if (err < 0) {
67	aq_ring_free(self);
68	self = NULL;
69	}
70	return self;
71	}
72
73	struct aq_ring_s aq_ring_rx_alloc(struct aq_ring_s self,
74	struct aq_nic_s *aq_nic,
75	unsigned int idx,
76	struct aq_nic_cfg_s *aq_nic_cfg)
77	{
78	int err = 0;
79
80	self->aq_nic = aq_nic;
81	self->idx = idx;
82	self->size = aq_nic_cfg->rxds;
83	self->dx_size = aq_nic_cfg->aq_hw_caps->rxd_size;
84
85	self = aq_ring_alloc(self, aq_nic);
86	if (!self) {
87	err = -ENOMEM;
88	goto err_exit;
89	}
90
91	err_exit:
92	if (err < 0) {
93	aq_ring_free(self);
94	self = NULL;
95	}
96	return self;
97	}
98
99	int aq_ring_init(struct aq_ring_s *self)
100	{
101	self->hw_head = 0;
102	self->sw_head = 0;
103	self->sw_tail = 0;
9f0dd8c3	104	spin_lock_init(&self->header.lock);
018423e9 DV	105	return 0;
	106	}
	107
eb36bedf	108	void aq_ring_tx_clean(struct aq_ring_s *self)
018423e9 DV	109	{
	110	struct device *dev = aq_nic_get_dev(self->aq_nic);
	111
	112	for (; self->sw_head != self->hw_head;
	113	self->sw_head = aq_ring_next_dx(self, self->sw_head)) {
	114	struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
	115
	116	if (likely(buff->is_mapped)) {
	117	if (unlikely(buff->is_sop))
	118	dma_unmap_single(dev, buff->pa, buff->len,
	119	DMA_TO_DEVICE);
	120	else
	121	dma_unmap_page(dev, buff->pa, buff->len,
	122	DMA_TO_DEVICE);
	123	}
	124
	125	if (unlikely(buff->is_eop))
	126	dev_kfree_skb_any(buff->skb);
	127	}
018423e9 DV	128	}
	129
	130	static inline unsigned int aq_ring_dx_in_range(unsigned int h, unsigned int i,
	131	unsigned int t)
	132	{
	133	return (h < t) ? ((h < i) && (i < t)) : ((h < i) \|\| (i < t));
	134	}
	135
	136	#define AQ_SKB_ALIGN SKB_DATA_ALIGN(sizeof(struct skb_shared_info))
	137	int aq_ring_rx_clean(struct aq_ring_s self, int work_done, int budget)
	138	{
	139	struct net_device *ndev = aq_nic_get_ndev(self->aq_nic);
	140	int err = 0;
	141	bool is_rsc_completed = true;
	142
	143	for (; (self->sw_head != self->hw_head) && budget;
	144	self->sw_head = aq_ring_next_dx(self, self->sw_head),
	145	--budget, ++(*work_done)) {
	146	struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
	147	struct sk_buff *skb = NULL;
	148	unsigned int next_ = 0U;
	149	unsigned int i = 0U;
	150	struct aq_ring_buff_s *buff_ = NULL;
	151
	152	if (buff->is_error) {
	153	__free_pages(buff->page, 0);
	154	continue;
	155	}
	156
	157	if (buff->is_cleaned)
	158	continue;
	159
	160	if (!buff->is_eop) {
	161	for (next_ = buff->next,
	162	buff_ = &self->buff_ring[next_]; true;
	163	next_ = buff_->next,
	164	buff_ = &self->buff_ring[next_]) {
	165	is_rsc_completed =
	166	aq_ring_dx_in_range(self->sw_head,
	167	next_,
	168	self->hw_head);
	169
	170	if (unlikely(!is_rsc_completed)) {
	171	is_rsc_completed = false;
	172	break;
	173	}
	174
	175	if (buff_->is_eop)
	176	break;
	177	}
	178
	179	if (!is_rsc_completed) {
	180	err = 0;
	181	goto err_exit;
	182	}
	183	}
	184
	185	/* for single fragment packets use build_skb() */
	186	if (buff->is_eop) {
	187	skb = build_skb(page_address(buff->page),
	188	buff->len + AQ_SKB_ALIGN);
	189	if (unlikely(!skb)) {
	190	err = -ENOMEM;
	191	goto err_exit;
192	}
193
018423e9 DV	194	skb_put(skb, buff->len);
	195	} else {
	196	skb = netdev_alloc_skb(ndev, ETH_HLEN);
	197	if (unlikely(!skb)) {
	198	err = -ENOMEM;
	199	goto err_exit;
	200	}
	201	skb_put(skb, ETH_HLEN);
	202	memcpy(skb->data, page_address(buff->page), ETH_HLEN);
	203
	204	skb_add_rx_frag(skb, 0, buff->page, ETH_HLEN,
	205	buff->len - ETH_HLEN,
	206	SKB_TRUESIZE(buff->len - ETH_HLEN));
	207
	208	for (i = 1U, next_ = buff->next,
	209	buff_ = &self->buff_ring[next_]; true;
	210	next_ = buff_->next,
	211	buff_ = &self->buff_ring[next_], ++i) {
	212	skb_add_rx_frag(skb, i, buff_->page, 0,
	213	buff_->len,
	214	SKB_TRUESIZE(buff->len -
	215	ETH_HLEN));
	216	buff_->is_cleaned = 1;
	217
	218	if (buff_->is_eop)
	219	break;
	220	}
	221	}
	222
	223	skb->protocol = eth_type_trans(skb, ndev);
	224	if (unlikely(buff->is_cso_err)) {
	225	++self->stats.rx.errors;
	226	__skb_mark_checksum_bad(skb);
	227	} else {
	228	if (buff->is_ip_cso) {
	229	__skb_incr_checksum_unnecessary(skb);
	230	if (buff->is_udp_cso \|\| buff->is_tcp_cso)
	231	__skb_incr_checksum_unnecessary(skb);
	232	} else {
	233	skb->ip_summed = CHECKSUM_NONE;
	234	}
	235	}
	236
	237	skb_set_hash(skb, buff->rss_hash,
	238	buff->is_hash_l4 ? PKT_HASH_TYPE_L4 :
	239	PKT_HASH_TYPE_NONE);
	240
	241	skb_record_rx_queue(skb, self->idx);
	242
	243	netif_receive_skb(skb);
	244
	245	++self->stats.rx.packets;
	246	self->stats.rx.bytes += skb->len;
	247	}
	248
	249	err_exit:
	250	return err;
	251	}
	252
	253	int aq_ring_rx_fill(struct aq_ring_s *self)
	254	{
89b64388 PB	255	unsigned int pages_order = fls(AQ_CFG_RX_FRAME_MAX / PAGE_SIZE +
89b64388 PB	256	(AQ_CFG_RX_FRAME_MAX % PAGE_SIZE ? 1 : 0)) - 1;
018423e9 DV	257	struct aq_ring_buff_s *buff = NULL;
	258	int err = 0;
	259	int i = 0;
	260
	261	for (i = aq_ring_avail_dx(self); i--;
	262	self->sw_tail = aq_ring_next_dx(self, self->sw_tail)) {
	263	buff = &self->buff_ring[self->sw_tail];
	264
	265	buff->flags = 0U;
	266	buff->len = AQ_CFG_RX_FRAME_MAX;
	267
	268	buff->page = alloc_pages(GFP_ATOMIC \| __GFP_COLD \|
89b64388	269	__GFP_COMP, pages_order);
018423e9 DV	270	if (!buff->page) {
	271	err = -ENOMEM;
	272	goto err_exit;
	273	}
	274
	275	buff->pa = dma_map_page(aq_nic_get_dev(self->aq_nic),
	276	buff->page, 0,
	277	AQ_CFG_RX_FRAME_MAX, DMA_FROM_DEVICE);
	278
ff1176f6 DC	279	if (dma_mapping_error(aq_nic_get_dev(self->aq_nic), buff->pa)) {
ff1176f6 DC	280	err = -ENOMEM;
018423e9	281	goto err_exit;
ff1176f6	282	}
018423e9 DV	283
	284	buff = NULL;
	285	}
018423e9 DV	286
	287	err_exit:
	288	if (err < 0) {
	289	if (buff && buff->page)
	290	__free_pages(buff->page, 0);
	291	}
	292
	293	return err;
	294	}
	295
	296	void aq_ring_rx_deinit(struct aq_ring_s *self)
	297	{
	298	if (!self)
	299	goto err_exit;
	300
	301	for (; self->sw_head != self->sw_tail;
	302	self->sw_head = aq_ring_next_dx(self, self->sw_head)) {
	303	struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
	304
	305	dma_unmap_page(aq_nic_get_dev(self->aq_nic), buff->pa,
	306	AQ_CFG_RX_FRAME_MAX, DMA_FROM_DEVICE);
	307
	308	__free_pages(buff->page, 0);
	309	}
	310
	311	err_exit:;
	312	}
	313
018423e9 DV	314	void aq_ring_free(struct aq_ring_s *self)
	315	{
	316	if (!self)
	317	goto err_exit;
	318
	319	kfree(self->buff_ring);
	320
	321	if (self->dx_ring)
	322	dma_free_coherent(aq_nic_get_dev(self->aq_nic),
	323	self->size * self->dx_size, self->dx_ring,
	324	self->dx_ring_pa);
	325
	326	err_exit:;
	327	}