blob: 74550ccc7a20ff8437463384e906b718027dc6ef [file] [log] [blame]
/*
* 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);
}
bool aq_ring_tx_clean(struct aq_ring_s *self)
{
struct device *dev = aq_nic_get_dev(self->aq_nic);
unsigned int budget = AQ_CFG_TX_CLEAN_BUDGET;
for (; self->sw_head != self->hw_head && budget--;
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;
}
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);
if (buff->is_udp_cso || buff->is_tcp_cso)
__skb_incr_checksum_unnecessary(skb);
} else {
skb->ip_summed = CHECKSUM_NONE;
}
}
#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 &&
buff->len <= AQ_CFG_RX_FRAME_MAX - AQ_SKB_ALIGN) {
skb = build_skb(page_address(buff->page),
AQ_CFG_RX_FRAME_MAX);
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));
if (!buff->is_eop) {
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);
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 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:;
}