net: ethernet: aquantia: Add ring support code (018423e9) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/net/ethernet/aquantia/atlantic/aq_ring.c

0 → 100644

+376 −0

Original line number	Diff line number	Diff line
		/*
		* 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;
		}

		void aq_ring_tx_append_buffs(struct aq_ring_s *self,
		struct aq_ring_buff_s *buffer,
		unsigned int buffers)
		{
		if (likely(self->sw_tail + buffers < self->size)) {
		memcpy(&self->buff_ring[self->sw_tail], buffer,
		sizeof(buffer[0]) * buffers);
		} else {
		unsigned int first_part = self->size - self->sw_tail;
		unsigned int second_part = buffers - first_part;

		memcpy(&self->buff_ring[self->sw_tail], buffer,
		sizeof(buffer[0]) * first_part);

		memcpy(&self->buff_ring[0], &buffer[first_part],
		sizeof(buffer[0]) * second_part);
		}
		}

		int 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);
		}

		if (aq_ring_avail_dx(self) > AQ_CFG_SKB_FRAGS_MAX)
		aq_nic_ndev_queue_start(self->aq_nic, self->idx);

		return 0;
		}

		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->dev = ndev;
		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)
		{
		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, 0);
		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);

		err = dma_mapping_error(aq_nic_get_dev(self->aq_nic), buff->pa);
		if (err < 0)
		goto err_exit;

		buff = NULL;
		}
		if (err < 0)
		goto err_exit;

		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_tx_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];
		struct device *ndev = aq_nic_get_dev(self->aq_nic);

		if (likely(buff->is_mapped)) {
		if (unlikely(buff->is_sop)) {
		dma_unmap_single(ndev, buff->pa, buff->len,
		DMA_TO_DEVICE);
		} else {
		dma_unmap_page(ndev, buff->pa, buff->len,
		DMA_TO_DEVICE);
		}
		}

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

drivers/net/ethernet/aquantia/atlantic/aq_ring.h

0 → 100644

+157 −0

Original line number	Diff line number	Diff line
		/*
		* 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.h: Declaration of functions for Rx/Tx rings. */

		#ifndef AQ_RING_H
		#define AQ_RING_H

		#include "aq_common.h"

		struct page;

		/* TxC SOP DX EOP
		* +----------+----------+----------+-----------
		* 8bytes\|len l3,l4 \| pa \| pa \| pa
		* +----------+----------+----------+-----------
		* 4/8bytes\|len pkt \|len pkt \| \| skb
		* +----------+----------+----------+-----------
		* 4/8bytes\|is_txc \|len,flags \|len \|len,is_eop
		* +----------+----------+----------+-----------
		*
		* This aq_ring_buff_s doesn't have endianness dependency.
		* It is __packed for cache line optimizations.
		*/
		struct __packed aq_ring_buff_s {
		union {
		/* RX */
		struct {
		u32 rss_hash;
		u16 next;
		u8 is_hash_l4;
		u8 rsvd1;
		struct page *page;
		};
		/* EOP */
		struct {
		dma_addr_t pa_eop;
		struct sk_buff *skb;
		};
		/* DX */
		struct {
		dma_addr_t pa;
		};
		/* SOP */
		struct {
		dma_addr_t pa_sop;
		u32 len_pkt_sop;
		};
		/* TxC */
		struct {
		u32 mss;
		u8 len_l2;
		u8 len_l3;
		u8 len_l4;
		u8 rsvd2;
		u32 len_pkt;
		};
		};
		union {
		struct {
		u32 len:16;
		u32 is_ip_cso:1;
		u32 is_udp_cso:1;
		u32 is_tcp_cso:1;
		u32 is_cso_err:1;
		u32 is_sop:1;
		u32 is_eop:1;
		u32 is_txc:1;
		u32 is_mapped:1;
		u32 is_cleaned:1;
		u32 is_error:1;
		u32 rsvd3:6;
		};
		u32 flags;
		};
		};

		struct aq_ring_stats_rx_s {
		u64 errors;
		u64 packets;
		u64 bytes;
		u64 lro_packets;
		u64 jumbo_packets;
		};

		struct aq_ring_stats_tx_s {
		u64 errors;
		u64 packets;
		u64 bytes;
		};

		union aq_ring_stats_s {
		struct aq_ring_stats_rx_s rx;
		struct aq_ring_stats_tx_s tx;
		};

		struct aq_ring_s {
		struct aq_obj_s header;
		struct aq_ring_buff_s *buff_ring;
		u8 dx_ring; / descriptors ring, dma shared mem */
		struct aq_nic_s *aq_nic;
		unsigned int idx; /* for HW layer registers operations */
		unsigned int hw_head;
		unsigned int sw_head;
		unsigned int sw_tail;
		unsigned int size; /* descriptors number */
		unsigned int dx_size; /* TX or RX descriptor size, */
		/* stored here for fater math */
		union aq_ring_stats_s stats;
		dma_addr_t dx_ring_pa;
		};

		struct aq_ring_param_s {
		unsigned int vec_idx;
		unsigned int cpu;
		cpumask_t affinity_mask;
		};

		static inline unsigned int aq_ring_next_dx(struct aq_ring_s *self,
		unsigned int dx)
		{
		return (++dx >= self->size) ? 0U : dx;
		}

		static inline unsigned int aq_ring_avail_dx(struct aq_ring_s *self)
		{
		return (((self->sw_tail >= self->sw_head)) ?
		(self->size - 1) - self->sw_tail + self->sw_head :
		self->sw_head - self->sw_tail - 1);
		}

		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);
		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 aq_ring_init(struct aq_ring_s *self);
		void aq_ring_tx_deinit(struct aq_ring_s *self);
		void aq_ring_rx_deinit(struct aq_ring_s *self);
		void aq_ring_free(struct aq_ring_s *self);
		void aq_ring_tx_append_buffs(struct aq_ring_s *ring,
		struct aq_ring_buff_s *buffer,
		unsigned int buffers);
		int aq_ring_tx_clean(struct aq_ring_s *self);
		int aq_ring_rx_clean(struct aq_ring_s self, int work_done, int budget);
		int aq_ring_rx_fill(struct aq_ring_s *self);

		#endif /* AQ_RING_H */