499 lines
11 KiB
C
499 lines
11 KiB
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)) {
|
||
|
|
++self->stats.rx.packets;
|
||
|
|
self->stats.tx.bytes += buff->skb->len;
|
||
|
|
|
||
|
|
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;
|
||
|
|
buff->is_cso_err |= buff_->is_cso_err;
|
||
|
|
|
||
|
|
} while (!buff_->is_eop);
|
||
|
|
|
||
|
|
if (!is_rsc_completed) {
|
||
|
|
err = 0;
|
||
|
|
goto err_exit;
|
||
|
|
}
|
||
|
|
if (buff->is_error || buff->is_cso_err) {
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (buff->is_vlan)
|
||
|
|
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
|
||
|
|
buff->vlan_rx_tag);
|
||
|
|
|
||
|
|
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:;
|
||
|
|
}
|