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/*
* Huawei HiNIC PCI Express Linux driver
* Copyright(c) 2017 Huawei Technologies Co., Ltd
*
* 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.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
*/
#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 <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
/**
* 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;
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;
} 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);
}
/**
* 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);
}
tasklet_schedule(&rxq->rx_task);
return i;
}
/**
* free_all_rx_skbs - free all skbs in rx queue
* @rxq: rx queue
**/
static void free_all_rx_skbs(struct hinic_rxq *rxq)
{
struct hinic_rq *rq = rxq->rq;
struct hinic_hw_wqe *hw_wqe;
struct hinic_sge sge;
u16 ci;
while ((hw_wqe = hinic_read_wqe(rq->wq, HINIC_RQ_WQE_SIZE, &ci))) {
if (IS_ERR(hw_wqe))
break;
hinic_rq_get_sge(rq, &hw_wqe->rq_wqe, ci, &sge);
hinic_put_wqe(rq->wq, HINIC_RQ_WQE_SIZE);
rx_free_skb(rxq, rq->saved_skb[ci], hinic_sge_to_dma(&sge));
}
}
/**
* rx_alloc_task - tasklet for queue allocation
* @data: rx queue
**/
static void rx_alloc_task(unsigned long data)
{
struct hinic_rxq *rxq = (struct hinic_rxq *)data;
(void)rx_alloc_pkts(rxq);
}
/**
* rx_recv_jumbo_pkt - Rx handler for jumbo pkt
* @rxq: rx queue
* @head_skb: the first skb in the list
* @left_pkt_len: left size of the pkt exclude head skb
* @ci: consumer index
*
* Return number of wqes that used for the left of the pkt
**/
static int rx_recv_jumbo_pkt(struct hinic_rxq *rxq, struct sk_buff *head_skb,
unsigned int left_pkt_len, u16 ci)
{
struct sk_buff *skb, *curr_skb = head_skb;
struct hinic_rq_wqe *rq_wqe;
unsigned int curr_len;
struct hinic_sge sge;
int num_wqes = 0;
while (left_pkt_len > 0) {
rq_wqe = hinic_rq_read_next_wqe(rxq->rq, HINIC_RQ_WQE_SIZE,
&skb, &ci);
num_wqes++;
hinic_rq_get_sge(rxq->rq, rq_wqe, ci, &sge);
rx_unmap_skb(rxq, hinic_sge_to_dma(&sge));
prefetch(skb->data);
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