blob: 070a7cc6392e8e3346b80d956c873c1bd70daf70 [file] [log] [blame]
// 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
**/
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_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);
curr_len = (left_pkt_len > HINIC_RX_BUF_SZ) ? HINIC_RX_BUF_SZ :
left_pkt_len;
left_pkt_len -= curr_len;
__skb_put(skb, curr_len);
if (curr_skb == head_skb)
skb_shinfo(head_skb)->frag_list = skb;
else
curr_skb->next = skb;
head_skb->len += skb->len;
head_skb->data_len += skb->len;
head_skb->truesize += skb->truesize;
curr_skb = skb;
}
return num_wqes;
}
static void hinic_copy_lp_data(struct hinic_dev *nic_dev,
struct sk_buff *skb)
{
struct net_device *netdev = nic_dev->netdev;
u8 *lb_buf = nic_dev->lb_test_rx_buf;
int lb_len = nic_dev->lb_pkt_len;
int pkt_offset, frag_len, i;
void *frag_data = NULL;
if (nic_dev->lb_test_rx_idx == LP_PKT_CNT) {
nic_dev->lb_test_rx_idx = 0;
netif_warn(nic_dev, drv, netdev, "Loopback test warning, receive too more test pkts\n");
}
if (skb->len != nic_dev->lb_pkt_len) {
netif_warn(nic_dev, drv, netdev, "Wrong packet length\n");
nic_dev->lb_test_rx_idx++;
return;
}
pkt_offset = nic_dev->lb_test_rx_idx * lb_len;
frag_len = (int)skb_headlen(skb);
memcpy(lb_buf + pkt_offset, skb->data, frag_len);
pkt_offset += frag_len;
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
frag_data = skb_frag_address(&skb_shinfo(skb)->frags[i]);
frag_len = (int)skb_frag_size(&skb_shinfo(skb)->frags[i]);
memcpy((lb_buf + pkt_offset), frag_data, frag_len);
pkt_offset += frag_len;
}
nic_dev->lb_test_rx_idx++;
}
/**
* rxq_recv - Rx handler
* @rxq: rx queue
* @budget: maximum pkts to process
*
* Return number of pkts received
**/
static int rxq_recv(struct hinic_rxq *rxq, int budget)
{
struct hinic_qp *qp = container_of(rxq->rq, struct hinic_qp, rq);
struct net_device *netdev = rxq->netdev;
u64 pkt_len = 0, rx_bytes = 0;
struct hinic_rq *rq = rxq->rq;
struct hinic_rq_wqe *rq_wqe;
struct hinic_dev *nic_dev;
unsigned int free_wqebbs;
struct hinic_rq_cqe *cqe;
int num_wqes, pkts = 0;
struct hinic_sge sge;
unsigned int status;
struct sk_buff *skb;
u32 offload_type;
u16 ci, num_lro;
u16 num_wqe = 0;
u32 vlan_len;
u16 vid;
nic_dev = netdev_priv(netdev);
while (pkts < budget) {
num_wqes = 0;
rq_wqe = hinic_rq_read_wqe(rxq->rq, HINIC_RQ_WQE_SIZE, &skb,
&ci);
if (!rq_wqe)
break;
/* make sure we read rx_done before packet length */
dma_rmb();
cqe = rq->cqe[ci];
status = be32_to_cpu(cqe->status);
hinic_rq_get_sge(rxq->rq, rq_wqe, ci, &sge);
rx_unmap_skb(rxq, hinic_sge_to_dma(&sge));
rx_csum(rxq, status, skb);
prefetch(skb->data);
pkt_len = sge.len;
if (pkt_len <= HINIC_RX_BUF_SZ) {
__skb_put(skb, pkt_len);
} else {
__skb_put(skb, HINIC_RX_BUF_SZ);
num_wqes = rx_recv_jumbo_pkt(rxq, skb, pkt_len -
HINIC_RX_BUF_SZ, ci);
}
hinic_rq_put_wqe(rq, ci,
(num_wqes + 1) * HINIC_RQ_WQE_SIZE);
offload_type = be32_to_cpu(cqe->offload_type);
vlan_len = be32_to_cpu(cqe->len);
if ((netdev->features & NETIF_F_HW_VLAN_CTAG_RX) &&
HINIC_GET_RX_VLAN_OFFLOAD_EN(offload_type)) {
vid = HINIC_GET_RX_VLAN_TAG(vlan_len);
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
}
if (unlikely(nic_dev->flags & HINIC_LP_TEST))
hinic_copy_lp_data(nic_dev, skb);
skb_record_rx_queue(skb, qp->q_id);
skb->protocol = eth_type_trans(skb, rxq->netdev);
napi_gro_receive(&rxq->napi, skb);
pkts++;
rx_bytes += pkt_len;
num_lro = HINIC_GET_RX_NUM_LRO(status);
if (num_lro) {
rx_bytes += ((num_lro - 1) *
LRO_PKT_HDR_LEN(cqe));
num_wqe +=
(u16)(pkt_len >> rxq->rx_buff_shift) +
((pkt_len & (rxq->buf_len - 1)) ? 1 : 0);
}
cqe->status = 0;
if (num_wqe >= LRO_REPLENISH_THLD)
break;
}
free_wqebbs = hinic_get_rq_free_wqebbs(rxq->rq);
if (free_wqebbs > HINIC_RX_BUFFER_WRITE)
rx_alloc_pkts(rxq);
u64_stats_update_begin(&rxq->rxq_stats.syncp);
rxq->rxq_stats.pkts += pkts;
rxq->rxq_stats.bytes += rx_bytes;
u64_stats_update_end(&rxq->rxq_stats.syncp);
return pkts;
}
static int rx_poll(struct napi_struct *napi, int budget)
{
struct hinic_rxq *rxq = container_of(napi, struct hinic_rxq, napi);
struct hinic_dev *nic_dev = netdev_priv(rxq->netdev);
struct hinic_rq *rq = rxq->rq;
int pkts;
pkts = rxq_recv(rxq, budget);
if (pkts >= budget)
return budget;
napi_complete(napi);
if (!HINIC_IS_VF(nic_dev->hwdev->hwif))
hinic_hwdev_set_msix_state(nic_dev->hwdev,
rq->msix_entry,
HINIC_MSIX_ENABLE);
return pkts;
}
static void rx_add_napi(struct hinic_rxq *rxq)
{
struct hinic_dev *nic_dev = netdev_priv(rxq->netdev);
netif_napi_add(rxq->netdev, &rxq->napi, rx_poll, nic_dev->rx_weight);
napi_enable(&rxq->napi);
}
static void rx_del_napi(struct hinic_rxq *rxq)
{
napi_disable(&rxq->napi);
netif_napi_del(&rxq->napi);
}
static irqreturn_t rx_irq(int irq, void *data)
{
struct hinic_rxq *rxq = (struct hinic_rxq *)data;
struct hinic_rq *rq = rxq->rq;
struct hinic_dev *nic_dev;
/* Disable the interrupt until napi will be completed */
nic_dev = netdev_priv(rxq->netdev);
if (!HINIC_IS_VF(nic_dev->hwdev->hwif))
hinic_hwdev_set_msix_state(nic_dev->hwdev,
rq->msix_entry,
HINIC_MSIX_DISABLE);
nic_dev = netdev_priv(rxq->netdev);
hinic_hwdev_msix_cnt_set(nic_dev->hwdev, rq->msix_entry);
napi_schedule(&rxq->napi);
return IRQ_HANDLED;
}
static int rx_request_irq(struct hinic_rxq *rxq)
{
struct hinic_dev *nic_dev = netdev_priv(rxq->netdev);
struct hinic_msix_config interrupt_info = {0};
struct hinic_intr_coal_info *intr_coal = NULL;
struct hinic_hwdev *hwdev = nic_dev->hwdev;
struct hinic_rq *rq = rxq->rq;
struct hinic_qp *qp;
int err;
qp = container_of(rq, struct hinic_qp, rq);
rx_add_napi(rxq);
hinic_hwdev_msix_set(hwdev, rq->msix_entry,
RX_IRQ_NO_PENDING, RX_IRQ_NO_COALESC,
RX_IRQ_NO_LLI_TIMER, RX_IRQ_NO_CREDIT,
RX_IRQ_NO_RESEND_TIMER);
intr_coal = &nic_dev->rx_intr_coalesce[qp->q_id];
interrupt_info.msix_index = rq->msix_entry;
interrupt_info.coalesce_timer_cnt = intr_coal->coalesce_timer_cfg;
interrupt_info.pending_cnt = intr_coal->pending_limt;
interrupt_info.resend_timer_cnt = intr_coal->resend_timer_cfg;
err = hinic_set_interrupt_cfg(hwdev, &interrupt_info);
if (err) {
netif_err(nic_dev, drv, rxq->netdev,
"Failed to set RX interrupt coalescing attribute\n");
goto err_req_irq;
}
err = request_irq(rq->irq, rx_irq, 0, rxq->irq_name, rxq);
if (err)
goto err_req_irq;
cpumask_set_cpu(qp->q_id % num_online_cpus(), &rq->affinity_mask);
err = irq_set_affinity_hint(rq->irq, &rq->affinity_mask);
if (err)
goto err_irq_affinity;
return 0;
err_irq_affinity:
free_irq(rq->irq, rxq);
err_req_irq:
rx_del_napi(rxq);
return err;
}
static void rx_free_irq(struct hinic_rxq *rxq)
{
struct hinic_rq *rq = rxq->rq;
irq_set_affinity_hint(rq->irq, NULL);
free_irq(rq->irq, rxq);
rx_del_napi(rxq);
}
/**
* hinic_init_rxq - Initialize the Rx Queue
* @rxq: Logical Rx Queue
* @rq: Hardware Rx Queue to connect the Logical queue with
* @netdev: network device to connect the Logical queue with
*
* Return 0 - Success, negative - Failure
**/
int hinic_init_rxq(struct hinic_rxq *rxq, struct hinic_rq *rq,
struct net_device *netdev)
{
struct hinic_qp *qp = container_of(rq, struct hinic_qp, rq);
int err, pkts;
rxq->netdev = netdev;
rxq->rq = rq;
rxq->buf_len = HINIC_RX_BUF_SZ;
rxq->rx_buff_shift = ilog2(HINIC_RX_BUF_SZ);
rxq_stats_init(rxq);
rxq->irq_name = devm_kasprintf(&netdev->dev, GFP_KERNEL,
"%s_rxq%d", netdev->name, qp->q_id);
if (!rxq->irq_name)
return -ENOMEM;
pkts = rx_alloc_pkts(rxq);
if (!pkts) {
err = -ENOMEM;
goto err_rx_pkts;
}
err = rx_request_irq(rxq);
if (err) {
netdev_err(netdev, "Failed to request Rx irq\n");
goto err_req_rx_irq;
}
return 0;
err_req_rx_irq:
err_rx_pkts:
free_all_rx_skbs(rxq);
devm_kfree(&netdev->dev, rxq->irq_name);
return err;
}
/**
* hinic_clean_rxq - Clean the Rx Queue
* @rxq: Logical Rx Queue
**/
void hinic_clean_rxq(struct hinic_rxq *rxq)
{
struct net_device *netdev = rxq->netdev;
rx_free_irq(rxq);
free_all_rx_skbs(rxq);
devm_kfree(&netdev->dev, rxq->irq_name);
}