[mirror_ubuntu-hirsute-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;
	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);
}

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)) {
				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;
	}
}

#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);
	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->ip_summed = CHECKSUM_NONE;
		} 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);

		napi_gro_receive(napi, 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_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;
104	return 0;
105	}
106
c7545689 PB	107	static inline bool aq_ring_dx_in_range(unsigned int h, unsigned int i,
	108	unsigned int t)
	109	{
	110	return (h < t) ? ((h < i) && (i < t)) : ((h < i) \|\| (i < t));
	111	}
	112
3aec6412 IR	113	void aq_ring_update_queue_state(struct aq_ring_s *ring)
	114	{
	115	if (aq_ring_avail_dx(ring) <= AQ_CFG_SKB_FRAGS_MAX)
	116	aq_ring_queue_stop(ring);
	117	else if (aq_ring_avail_dx(ring) > AQ_CFG_RESTART_DESC_THRES)
	118	aq_ring_queue_wake(ring);
	119	}
	120
	121	void aq_ring_queue_wake(struct aq_ring_s *ring)
	122	{
	123	struct net_device *ndev = aq_nic_get_ndev(ring->aq_nic);
	124
	125	if (__netif_subqueue_stopped(ndev, ring->idx)) {
	126	netif_wake_subqueue(ndev, ring->idx);
	127	ring->stats.tx.queue_restarts++;
	128	}
	129	}
	130
	131	void aq_ring_queue_stop(struct aq_ring_s *ring)
	132	{
	133	struct net_device *ndev = aq_nic_get_ndev(ring->aq_nic);
	134
	135	if (!__netif_subqueue_stopped(ndev, ring->idx))
	136	netif_stop_subqueue(ndev, ring->idx);
	137	}
	138
eb36bedf	139	void aq_ring_tx_clean(struct aq_ring_s *self)
018423e9 DV	140	{
	141	struct device *dev = aq_nic_get_dev(self->aq_nic);
	142
	143	for (; self->sw_head != self->hw_head;
	144	self->sw_head = aq_ring_next_dx(self, self->sw_head)) {
	145	struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
	146
	147	if (likely(buff->is_mapped)) {
c7545689 PB	148	if (unlikely(buff->is_sop)) {
	149	if (!buff->is_eop &&
	150	buff->eop_index != 0xffffU &&
	151	(!aq_ring_dx_in_range(self->sw_head,
	152	buff->eop_index,
	153	self->hw_head)))
	154	break;
	155
018423e9 DV	156	dma_unmap_single(dev, buff->pa, buff->len,
018423e9 DV	157	DMA_TO_DEVICE);
c7545689	158	} else {
018423e9 DV	159	dma_unmap_page(dev, buff->pa, buff->len,
018423e9 DV	160	DMA_TO_DEVICE);
c7545689	161	}
018423e9 DV	162	}
	163
	164	if (unlikely(buff->is_eop))
	165	dev_kfree_skb_any(buff->skb);
018423e9	166
c7545689 PB	167	buff->pa = 0U;
	168	buff->eop_index = 0xffffU;
	169	}
018423e9 DV	170	}
	171
	172	#define AQ_SKB_ALIGN SKB_DATA_ALIGN(sizeof(struct skb_shared_info))
a54df682 PB	173	int aq_ring_rx_clean(struct aq_ring_s *self,
	174	struct napi_struct *napi,
	175	int *work_done,
	176	int budget)
018423e9 DV	177	{
	178	struct net_device *ndev = aq_nic_get_ndev(self->aq_nic);
	179	int err = 0;
	180	bool is_rsc_completed = true;
	181
	182	for (; (self->sw_head != self->hw_head) && budget;
	183	self->sw_head = aq_ring_next_dx(self, self->sw_head),
	184	--budget, ++(*work_done)) {
	185	struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
	186	struct sk_buff *skb = NULL;
	187	unsigned int next_ = 0U;
	188	unsigned int i = 0U;
	189	struct aq_ring_buff_s *buff_ = NULL;
	190
	191	if (buff->is_error) {
	192	__free_pages(buff->page, 0);
	193	continue;
	194	}
	195
	196	if (buff->is_cleaned)
	197	continue;
	198
	199	if (!buff->is_eop) {
	200	for (next_ = buff->next,
	201	buff_ = &self->buff_ring[next_]; true;
	202	next_ = buff_->next,
	203	buff_ = &self->buff_ring[next_]) {
	204	is_rsc_completed =
	205	aq_ring_dx_in_range(self->sw_head,
	206	next_,
	207	self->hw_head);
	208
	209	if (unlikely(!is_rsc_completed)) {
	210	is_rsc_completed = false;
	211	break;
	212	}
	213
	214	if (buff_->is_eop)
	215	break;
	216	}
	217
	218	if (!is_rsc_completed) {
	219	err = 0;
	220	goto err_exit;
	221	}
	222	}
	223
	224	/* for single fragment packets use build_skb() */
	225	if (buff->is_eop) {
	226	skb = build_skb(page_address(buff->page),
	227	buff->len + AQ_SKB_ALIGN);
	228	if (unlikely(!skb)) {
	229	err = -ENOMEM;
	230	goto err_exit;
	231	}
	232
018423e9 DV	233	skb_put(skb, buff->len);
	234	} else {
	235	skb = netdev_alloc_skb(ndev, ETH_HLEN);
	236	if (unlikely(!skb)) {
	237	err = -ENOMEM;
	238	goto err_exit;
	239	}
	240	skb_put(skb, ETH_HLEN);
	241	memcpy(skb->data, page_address(buff->page), ETH_HLEN);
	242
	243	skb_add_rx_frag(skb, 0, buff->page, ETH_HLEN,
	244	buff->len - ETH_HLEN,
	245	SKB_TRUESIZE(buff->len - ETH_HLEN));
	246
	247	for (i = 1U, next_ = buff->next,
	248	buff_ = &self->buff_ring[next_]; true;
	249	next_ = buff_->next,
	250	buff_ = &self->buff_ring[next_], ++i) {
	251	skb_add_rx_frag(skb, i, buff_->page, 0,
	252	buff_->len,
	253	SKB_TRUESIZE(buff->len -
	254	ETH_HLEN));
	255	buff_->is_cleaned = 1;
	256
	257	if (buff_->is_eop)
	258	break;
	259	}
	260	}
	261
	262	skb->protocol = eth_type_trans(skb, ndev);
	263	if (unlikely(buff->is_cso_err)) {
	264	++self->stats.rx.errors;
219f1d79	265	skb->ip_summed = CHECKSUM_NONE;
018423e9 DV	266	} else {
	267	if (buff->is_ip_cso) {
	268	__skb_incr_checksum_unnecessary(skb);
	269	if (buff->is_udp_cso \|\| buff->is_tcp_cso)
	270	__skb_incr_checksum_unnecessary(skb);
	271	} else {
	272	skb->ip_summed = CHECKSUM_NONE;
	273	}
	274	}
	275
	276	skb_set_hash(skb, buff->rss_hash,
	277	buff->is_hash_l4 ? PKT_HASH_TYPE_L4 :
	278	PKT_HASH_TYPE_NONE);
	279
	280	skb_record_rx_queue(skb, self->idx);
	281
a54df682	282	napi_gro_receive(napi, skb);
018423e9 DV	283
	284	++self->stats.rx.packets;
	285	self->stats.rx.bytes += skb->len;
	286	}
	287
	288	err_exit:
	289	return err;
	290	}
	291
	292	int aq_ring_rx_fill(struct aq_ring_s *self)
	293	{
89b64388 PB	294	unsigned int pages_order = fls(AQ_CFG_RX_FRAME_MAX / PAGE_SIZE +
89b64388 PB	295	(AQ_CFG_RX_FRAME_MAX % PAGE_SIZE ? 1 : 0)) - 1;
018423e9 DV	296	struct aq_ring_buff_s *buff = NULL;
	297	int err = 0;
	298	int i = 0;
	299
	300	for (i = aq_ring_avail_dx(self); i--;
	301	self->sw_tail = aq_ring_next_dx(self, self->sw_tail)) {
	302	buff = &self->buff_ring[self->sw_tail];
	303
	304	buff->flags = 0U;
	305	buff->len = AQ_CFG_RX_FRAME_MAX;
	306
453f85d4	307	buff->page = alloc_pages(GFP_ATOMIC \| __GFP_COMP, pages_order);
018423e9 DV	308	if (!buff->page) {
	309	err = -ENOMEM;
	310	goto err_exit;
	311	}
	312
	313	buff->pa = dma_map_page(aq_nic_get_dev(self->aq_nic),
	314	buff->page, 0,
	315	AQ_CFG_RX_FRAME_MAX, DMA_FROM_DEVICE);
	316
ff1176f6 DC	317	if (dma_mapping_error(aq_nic_get_dev(self->aq_nic), buff->pa)) {
ff1176f6 DC	318	err = -ENOMEM;
018423e9	319	goto err_exit;
ff1176f6	320	}
018423e9 DV	321
	322	buff = NULL;
	323	}
018423e9 DV	324
	325	err_exit:
	326	if (err < 0) {
	327	if (buff && buff->page)
	328	__free_pages(buff->page, 0);
	329	}
	330
	331	return err;
	332	}
	333
	334	void aq_ring_rx_deinit(struct aq_ring_s *self)
	335	{
	336	if (!self)
	337	goto err_exit;
	338
	339	for (; self->sw_head != self->sw_tail;
	340	self->sw_head = aq_ring_next_dx(self, self->sw_head)) {
	341	struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
	342
	343	dma_unmap_page(aq_nic_get_dev(self->aq_nic), buff->pa,
	344	AQ_CFG_RX_FRAME_MAX, DMA_FROM_DEVICE);
	345
	346	__free_pages(buff->page, 0);
	347	}
	348
	349	err_exit:;
	350	}
	351
018423e9 DV	352	void aq_ring_free(struct aq_ring_s *self)
	353	{
	354	if (!self)
	355	goto err_exit;
	356
	357	kfree(self->buff_ring);
	358
	359	if (self->dx_ring)
	360	dma_free_coherent(aq_nic_get_dev(self->aq_nic),
	361	self->size * self->dx_size, self->dx_ring,
	362	self->dx_ring_pa);
	363
	364	err_exit:;
	365	}