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// SPDX-License-Identifier: GPL-2.0-only
/*
* Huawei HiNIC PCI Express Linux driver
* Copyright(c) 2017 Huawei Technologies Co., Ltd
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/device.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/u64_stats_sync.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/skbuff.h>
#include <linux/dma-mapping.h>
#include <linux/prefetch.h>
#include <linux/cpumask.h>
#include <linux/if_vlan.h>
#include <asm/barrier.h>
#include "hinic_common.h"
#include "hinic_hw_if.h"
#include "hinic_hw_wqe.h"
#include "hinic_hw_wq.h"
#include "hinic_hw_qp.h"
#include "hinic_hw_dev.h"
#include "hinic_rx.h"
#include "hinic_dev.h"
#define RX_IRQ_NO_PENDING 0
#define RX_IRQ_NO_COALESC 0
#define RX_IRQ_NO_LLI_TIMER 0
#define RX_IRQ_NO_CREDIT 0
#define RX_IRQ_NO_RESEND_TIMER 0
#define HINIC_RX_BUFFER_WRITE 16
#define HINIC_RX_IPV6_PKT 7
#define LRO_PKT_HDR_LEN_IPV4 66
#define LRO_PKT_HDR_LEN_IPV6 86
#define LRO_REPLENISH_THLD 256
#define LRO_PKT_HDR_LEN(cqe) \
(HINIC_GET_RX_PKT_TYPE(be32_to_cpu((cqe)->offload_type)) == \
HINIC_RX_IPV6_PKT ? LRO_PKT_HDR_LEN_IPV6 : LRO_PKT_HDR_LEN_IPV4)
/**
* hinic_rxq_clean_stats - Clean the statistics of specific queue
* @rxq: Logical Rx Queue
**/
void hinic_rxq_clean_stats(struct hinic_rxq *rxq)
{
struct hinic_rxq_stats *rxq_stats = &rxq->rxq_stats;
u64_stats_update_begin(&rxq_stats->syncp);
rxq_stats->pkts = 0;
rxq_stats->bytes = 0;
rxq_stats->errors = 0;
rxq_stats->csum_errors = 0;
rxq_stats->other_errors = 0;
u64_stats_update_end(&rxq_stats->syncp);
}
/**
* hinic_rxq_get_stats - get statistics of Rx Queue
* @rxq: Logical Rx Queue
* @stats: return updated stats here
**/
void hinic_rxq_get_stats(struct hinic_rxq *rxq, struct hinic_rxq_stats *stats)
{
struct hinic_rxq_stats *rxq_stats = &rxq->rxq_stats;
unsigned int start;
u64_stats_update_begin(&stats->syncp);
do {
start = u64_stats_fetch_begin(&rxq_stats->syncp);
stats->pkts = rxq_stats->pkts;
stats->bytes = rxq_stats->bytes;
stats->errors = rxq_stats->csum_errors +
rxq_stats->other_errors;
stats->csum_errors = rxq_stats->csum_errors;
stats->other_errors = rxq_stats->other_errors;
} while (u64_stats_fetch_retry(&rxq_stats->syncp, start));
u64_stats_update_end(&stats->syncp);
}
/**
* rxq_stats_init - Initialize the statistics of specific queue
* @rxq: Logical Rx Queue
**/
static void rxq_stats_init(struct hinic_rxq *rxq)
{
struct hinic_rxq_stats *rxq_stats = &rxq->rxq_stats;
u64_stats_init(&rxq_stats->syncp);
hinic_rxq_clean_stats(rxq);
}
static void rx_csum(struct hinic_rxq *rxq, u32 status,
struct sk_buff *skb)
{
struct net_device *netdev = rxq->netdev;
u32 csum_err;
csum_err = HINIC_RQ_CQE_STATUS_GET(status, CSUM_ERR);
if (!(netdev->features & NETIF_F_RXCSUM))
return;
if (!csum_err) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
} else {
if (!(csum_err & (HINIC_RX_CSUM_HW_CHECK_NONE |
HINIC_RX_CSUM_IPSU_OTHER_ERR)))
rxq->rxq_stats.csum_errors++;
skb->ip_summed = CHECKSUM_NONE;
}
}
/**
* rx_alloc_skb - allocate skb and map it to dma address
* @rxq: rx queue
* @dma_addr: returned dma address for the skb
*
* Return skb
**/
static struct sk_buff *rx_alloc_skb(struct hinic_rxq *rxq,
dma_addr_t *dma_addr)
{
struct hinic_dev *nic_dev = netdev_priv(rxq->netdev);
struct hinic_hwdev *hwdev = nic_dev->hwdev;
struct hinic_hwif *hwif = hwdev->hwif;
struct pci_dev *pdev = hwif->pdev;
struct sk_buff *skb;
dma_addr_t addr;
int err;
skb = netdev_alloc_skb_ip_align(rxq->netdev, rxq->rq->buf_sz);
if (!skb) {
netdev_err(rxq->netdev, "Failed to allocate Rx SKB\n");
return NULL;
}
addr = dma_map_single(&pdev->dev, skb->data, rxq->rq->buf_sz,
DMA_FROM_DEVICE);
err = dma_mapping_error(&pdev->dev, addr);
if (err) {
dev_err(&pdev->dev, "Failed to map Rx DMA, err = %d\n", err);
goto err_rx_map;
}
*dma_addr = addr;
return skb;
err_rx_map:
dev_kfree_skb_any(skb);
return NULL;
}
/**
* rx_unmap_skb - unmap the dma address of the skb
* @rxq: rx queue
* @dma_addr: dma address of the skb
**/
static void rx_unmap_skb(struct hinic_rxq *rxq, dma_addr_t dma_addr)
{
struct hinic_dev *nic_dev = netdev_priv(rxq->netdev);
struct hinic_hwdev *hwdev = nic_dev->hwdev;
struct hinic_hwif *hwif = hwdev->hwif;
struct pci_dev *pdev = hwif->pdev;
dma_unmap_single(&pdev->dev, dma_addr, rxq->rq->buf_sz,
DMA_FROM_DEVICE);
}
/**
* rx_free_skb - unmap and free skb
* @rxq: rx queue
* @skb: skb to free
* @dma_addr: dma address of the skb
**/
static void rx_free_skb(struct hinic_rxq *rxq, struct sk_buff *skb,
dma_addr_t dma_addr)
{
rx_unmap_skb(rxq, dma_addr);
dev_kfree_skb_any(skb);
}
/**
* rx_alloc_pkts - allocate pkts in rx queue
* @rxq: rx queue
*
* Return number of skbs allocated
**/
static int rx_alloc_pkts(struct hinic_rxq *rxq)
{
struct hinic_dev *nic_dev = netdev_priv(rxq->netdev);
struct hinic_rq_wqe *rq_wqe;
unsigned int free_wqebbs;
struct hinic_sge sge;
dma_addr_t dma_addr;
struct sk_buff *skb;
u16 prod_idx;
int i;
free_wqebbs = hinic_get_rq_free_wqebbs(rxq->rq);
/* Limit the allocation chunks */
if (free_wqebbs > nic_dev->rx_weight)
free_wqebbs = nic_dev->rx_weight;
for (i = 0; i < free_wqebbs; i++) {
skb = rx_alloc_skb(rxq, &dma_addr);
if (!skb) {
netdev_err(rxq->netdev, "Failed to alloc Rx skb\n");
goto skb_out;
}
hinic_set_sge(&sge, dma_addr, skb->len);
rq_wqe = hinic_rq_get_wqe(rxq->rq, HINIC_RQ_WQE_SIZE,
&prod_idx);
if (!rq_wqe) {
rx_free_skb(rxq, skb, dma_addr);
goto skb_out;
}
hinic_rq_prepare_wqe(rxq->rq, prod_idx, rq_wqe, &sge);
hinic_rq_write_wqe(rxq->rq, prod_idx, rq_wqe, skb);
}
skb_out:
if (i) {
wmb(); /* write all the wqes before update PI */
hinic_rq_update(rxq->rq, prod_idx);
}
return i;
}
/**
* free_all_rx_skbs - free all skbs in rx queue
* @rxq: rx queue
**/
|