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kernel/drivers/net/ethernet/huawei/hinic/hinic_tx.c

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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/if_vlan.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/u64_stats_sync.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/skbuff.h>
#include <linux/smp.h>
#include <asm/byteorder.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/sctp.h>
#include <linux/ipv6.h>
#include <net/ipv6.h>
#include <net/checksum.h>
#include <net/ip6_checksum.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_dev.h"
#include "hinic_tx.h"
#define TX_IRQ_NO_PENDING 0
#define TX_IRQ_NO_COALESC 0
#define TX_IRQ_NO_LLI_TIMER 0
#define TX_IRQ_NO_CREDIT 0
#define TX_IRQ_NO_RESEND_TIMER 0
#define CI_UPDATE_NO_PENDING 0
#define CI_UPDATE_NO_COALESC 0
#define HW_CONS_IDX(sq) be16_to_cpu(*(u16 *)((sq)->hw_ci_addr))
#define MIN_SKB_LEN 32
#define MAX_PAYLOAD_OFFSET 221
#define TRANSPORT_OFFSET(l4_hdr, skb) ((u32)((l4_hdr) - (skb)->data))
union hinic_l3 {
struct iphdr *v4;
struct ipv6hdr *v6;
unsigned char *hdr;
};
union hinic_l4 {
struct tcphdr *tcp;
struct udphdr *udp;
unsigned char *hdr;
};
enum hinic_offload_type {
TX_OFFLOAD_TSO = BIT(0),
TX_OFFLOAD_CSUM = BIT(1),
TX_OFFLOAD_VLAN = BIT(2),
TX_OFFLOAD_INVALID = BIT(3),
};
/**
* hinic_txq_clean_stats - Clean the statistics of specific queue
* @txq: Logical Tx Queue
**/
static void hinic_txq_clean_stats(struct hinic_txq *txq)
{
struct hinic_txq_stats *txq_stats = &txq->txq_stats;
u64_stats_update_begin(&txq_stats->syncp);
txq_stats->pkts = 0;
txq_stats->bytes = 0;
txq_stats->tx_busy = 0;
txq_stats->tx_wake = 0;
txq_stats->tx_dropped = 0;
txq_stats->big_frags_pkts = 0;
u64_stats_update_end(&txq_stats->syncp);
}
/**
* hinic_txq_get_stats - get statistics of Tx Queue
* @txq: Logical Tx Queue
* @stats: return updated stats here
**/
void hinic_txq_get_stats(struct hinic_txq *txq, struct hinic_txq_stats *stats)
{
struct hinic_txq_stats *txq_stats = &txq->txq_stats;
unsigned int start;
do {
start = u64_stats_fetch_begin(&txq_stats->syncp);
stats->pkts = txq_stats->pkts;
stats->bytes = txq_stats->bytes;
stats->tx_busy = txq_stats->tx_busy;
stats->tx_wake = txq_stats->tx_wake;
stats->tx_dropped = txq_stats->tx_dropped;
stats->big_frags_pkts = txq_stats->big_frags_pkts;
} while (u64_stats_fetch_retry(&txq_stats->syncp, start));
}
/**
* txq_stats_init - Initialize the statistics of specific queue
* @txq: Logical Tx Queue
**/
static void txq_stats_init(struct hinic_txq *txq)
{
struct hinic_txq_stats *txq_stats = &txq->txq_stats;
u64_stats_init(&txq_stats->syncp);
hinic_txq_clean_stats(txq);
}
/**
* tx_map_skb - dma mapping for skb and return sges
* @nic_dev: nic device
* @skb: the skb
* @sges: returned sges
*
* Return 0 - Success, negative - Failure
**/
static int tx_map_skb(struct hinic_dev *nic_dev, struct sk_buff *skb,
struct hinic_sge *sges)
{
struct hinic_hwdev *hwdev = nic_dev->hwdev;
struct hinic_hwif *hwif = hwdev->hwif;
struct pci_dev *pdev = hwif->pdev;
skb_frag_t *frag;
dma_addr_t dma_addr;
int i, j;
dma_addr = dma_map_single(&pdev->dev, skb->data, skb_headlen(skb),
DMA_TO_DEVICE);
if (dma_mapping_error(&pdev->dev, dma_addr)) {
dev_err(&pdev->dev, "Failed to map Tx skb data\n");
return -EFAULT;
}
hinic_set_sge(&sges[0], dma_addr, skb_headlen(skb));
for (i = 0 ; i < skb_shinfo(skb)->nr_frags; i++) {
frag = &skb_shinfo(skb)->frags[i];
dma_addr = skb_frag_dma_map(&pdev->dev, frag, 0,
skb_frag_size(frag),
DMA_TO_DEVICE);
if (dma_mapping_error(&pdev->dev, dma_addr)) {
dev_err(&pdev->dev, "Failed to map Tx skb frag\n");
goto err_tx_map;
}
hinic_set_sge(&sges[i + 1], dma_addr, skb_frag_size(frag));
}
return 0;
err_tx_map:
for (j = 0; j < i; j++)
dma_unmap_page(&pdev->dev, hinic_sge_to_dma(&sges[j + 1]),
sges[j + 1].len, DMA_TO_DEVICE);
dma_unmap_single(&pdev->dev, hinic_sge_to_dma(&sges[0]), sges[0].len,
DMA_TO_DEVICE);
return -EFAULT;
}
/**
* tx_unmap_skb - unmap the dma address of the skb
* @nic_dev: nic device
* @skb: the skb
* @sges: the sges that are connected to the skb
**/
static void tx_unmap_skb(struct hinic_dev *nic_dev, struct sk_buff *skb,
struct hinic_sge *sges)
{
struct hinic_hwdev *hwdev = nic_dev->hwdev;
struct hinic_hwif *hwif = hwdev->hwif;
struct pci_dev *pdev = hwif->pdev;
int i;
for (i = 0; i < skb_shinfo(skb)->nr_frags ; i++)
dma_unmap_page(&pdev->dev, hinic_sge_to_dma(&sges[i + 1]),
sges[i + 1].len, DMA_TO_DEVICE);
dma_unmap_single(&pdev->dev, hinic_sge_to_dma(&sges[0]), sges[0].len,
DMA_TO_DEVICE);
}
static void get_inner_l3_l4_type(struct sk_buff *skb, union hinic_l3 *ip,
union hinic_l4 *l4,
enum hinic_offload_type offload_type,
enum hinic_l3_offload_type *l3_type,
u8 *l4_proto)
{
u8 *exthdr;
if (ip->v4->version == 4) {
*l3_type = (offload_type == TX_OFFLOAD_CSUM) ?
IPV4_PKT_NO_CHKSUM_OFFLOAD :
IPV4_PKT_WITH_CHKSUM_OFFLOAD;
*l4_proto = ip->v4->protocol;
} else if (ip->v4->version == 6) {
*l3_type = IPV6_PKT;
exthdr = ip->hdr + sizeof(*ip->v6);
*l4_proto = ip->v6->nexthdr;
if (exthdr != l4->hdr) {
int start = exthdr - skb->data;
__be16 frag_off;
ipv6_skip_exthdr(skb, start, l4_proto, &frag_off);
}
} else {
*l3_type = L3TYPE_UNKNOWN;
*l4_proto = 0;
}
}
static void get_inner_l4_info(struct sk_buff *skb, union hinic_l4 *l4,
enum hinic_offload_type offload_type, u8 l4_proto,
enum hinic_l4_offload_type *l4_offload,
u32 *l4_len, u32 *offset)
{
*l4_offload = OFFLOAD_DISABLE;
*offset = 0;
*l4_len = 0;
switch (l4_proto) {
case IPPROTO_TCP:
*l4_offload = TCP_OFFLOAD_ENABLE;
/* doff in unit of 4B */
*l4_len = l4->tcp->doff * 4;
*offset = *l4_len + TRANSPORT_OFFSET(l4->hdr, skb);
break;
case IPPROTO_UDP:
*l4_offload = UDP_OFFLOAD_ENABLE;
*l4_len = sizeof(struct udphdr);
*offset = TRANSPORT_OFFSET(l4->hdr, skb);
break;
case IPPROTO_SCTP:
/* only csum offload support sctp */
if (offload_type != TX_OFFLOAD_CSUM)
break;
*l4_offload = SCTP_OFFLOAD_ENABLE;
*l4_len = sizeof(struct sctphdr);
*offset = TRANSPORT_OFFSET(l4->hdr, skb);
break;
default:
break;
}
}
static __sum16 csum_magic(union hinic_l3 *ip, unsigned short proto)
{
return (ip->v4->version == 4) ?
csum_tcpudp_magic(ip->v4->saddr, ip->v4->daddr, 0, proto, 0) :
csum_ipv6_magic(&ip->v6->saddr, &ip->v6->daddr, 0, proto, 0);
}
static int offload_tso(struct hinic_sq_task *task, u32 *queue_info,
struct sk_buff *skb)
{
u32 offset, l4_len, ip_identify, network_hdr_len;
enum hinic_l3_offload_type l3_offload;
enum hinic_l4_offload_type l4_offload;
union hinic_l3 ip;
union hinic_l4 l4;
u8 l4_proto;
if (!skb_is_gso(skb))
return 0;
if (skb_cow_head(skb, 0) < 0)
return -EPROTONOSUPPORT;
if (skb->encapsulation) {
u32 gso_type = skb_shinfo(skb)->gso_type;
u32 tunnel_type = 0;
u32 l4_tunnel_len;
ip.hdr = skb_network_header(skb);
l4.hdr = skb_transport_header(skb);
network_hdr_len = skb_inner_network_header_len(skb);
if (ip.v4->version == 4) {
ip.v4->tot_len = 0;
l3_offload = IPV4_PKT_WITH_CHKSUM_OFFLOAD;
} else if (ip.v4->version == 6) {
l3_offload = IPV6_PKT;
} else {
l3_offload = 0;
}
hinic_task_set_outter_l3(task, l3_offload,
skb_network_header_len(skb));
if (gso_type & SKB_GSO_UDP_TUNNEL_CSUM) {
l4.udp->check = ~csum_magic(&ip, IPPROTO_UDP);
tunnel_type = TUNNEL_UDP_CSUM;
} else if (gso_type & SKB_GSO_UDP_TUNNEL) {
tunnel_type = TUNNEL_UDP_NO_CSUM;
}
l4_tunnel_len = skb_inner_network_offset(skb) -
skb_transport_offset(skb);
hinic_task_set_tunnel_l4(task, tunnel_type, l4_tunnel_len);
ip.hdr = skb_inner_network_header(skb);
l4.hdr = skb_inner_transport_header(skb);
} else {
ip.hdr = skb_network_header(skb);
l4.hdr = skb_transport_header(skb);
network_hdr_len = skb_network_header_len(skb);
}
/* initialize inner IP header fields */
if (ip.v4->version == 4)
ip.v4->tot_len = 0;
else
ip.v6->payload_len = 0;
get_inner_l3_l4_type(skb, &ip, &l4, TX_OFFLOAD_TSO, &l3_offload,
&l4_proto);
hinic_task_set_inner_l3(task, l3_offload, network_hdr_len);
ip_identify = 0;
if (l4_proto == IPPROTO_TCP)
l4.tcp->check = ~csum_magic(&ip, IPPROTO_TCP);
get_inner_l4_info(skb, &l4, TX_OFFLOAD_TSO, l4_proto, &l4_offload,
&l4_len, &offset);
hinic_set_tso_inner_l4(task, queue_info, l4_offload, l4_len, offset,
ip_identify, skb_shinfo(skb)->gso_size);
return 1;
}
static int offload_csum(struct hinic_sq_task *task, u32 *queue_info,
struct sk_buff *skb)
{
enum hinic_l4_offload_type l4_offload;
u32 offset, l4_len, network_hdr_len;
enum hinic_l3_offload_type l3_type;
u32 tunnel_type = NOT_TUNNEL;
union hinic_l3 ip;
union hinic_l4 l4;
u8 l4_proto;
if (skb->ip_summed != CHECKSUM_PARTIAL)
return 0;
if (skb->encapsulation) {
u32 l4_tunnel_len;
tunnel_type = TUNNEL_UDP_NO_CSUM;
ip.hdr = skb_network_header(skb);
if (ip.v4->version == 4) {
l3_type = IPV4_PKT_NO_CHKSUM_OFFLOAD;
l4_proto = ip.v4->protocol;
} else if (ip.v4->version == 6) {
unsigned char *exthdr;
__be16 frag_off;
l3_type = IPV6_PKT;
tunnel_type = TUNNEL_UDP_CSUM;
exthdr = ip.hdr + sizeof(*ip.v6);
l4_proto = ip.v6->nexthdr;
l4.hdr = skb_transport_header(skb);
if (l4.hdr != exthdr)
ipv6_skip_exthdr(skb, exthdr - skb->data,
&l4_proto, &frag_off);
} else {
l3_type = L3TYPE_UNKNOWN;
l4_proto = IPPROTO_RAW;
}
hinic_task_set_outter_l3(task, l3_type,
skb_network_header_len(skb));
switch (l4_proto) {
case IPPROTO_UDP:
l4_tunnel_len = skb_inner_network_offset(skb) -
skb_transport_offset(skb);
ip.hdr = skb_inner_network_header(skb);
l4.hdr = skb_inner_transport_header(skb);
network_hdr_len = skb_inner_network_header_len(skb);
break;
case IPPROTO_IPIP:
case IPPROTO_IPV6:
tunnel_type = NOT_TUNNEL;
l4_tunnel_len = 0;
ip.hdr = skb_inner_network_header(skb);
l4.hdr = skb_transport_header(skb);
network_hdr_len = skb_network_header_len(skb);
break;
default:
/* Unsupported tunnel packet, disable csum offload */
skb_checksum_help(skb);
return 0;
}
hinic_task_set_tunnel_l4(task, tunnel_type, l4_tunnel_len);
} else {
ip.hdr = skb_network_header(skb);
l4.hdr = skb_transport_header(skb);
network_hdr_len = skb_network_header_len(skb);
}
get_inner_l3_l4_type(skb, &ip, &l4, TX_OFFLOAD_CSUM, &l3_type,
&l4_proto);
hinic_task_set_inner_l3(task, l3_type, network_hdr_len);
get_inner_l4_info(skb, &l4, TX_OFFLOAD_CSUM, l4_proto, &l4_offload,
&l4_len, &offset);
hinic_set_cs_inner_l4(task, queue_info, l4_offload, l4_len, offset);
return 1;
}
static void offload_vlan(struct hinic_sq_task *task, u32 *queue_info,
u16 vlan_tag, u16 vlan_pri)
{
task->pkt_info0 |= HINIC_SQ_TASK_INFO0_SET(vlan_tag, VLAN_TAG) |
HINIC_SQ_TASK_INFO0_SET(1U, VLAN_OFFLOAD);
*queue_info |= HINIC_SQ_CTRL_SET(vlan_pri, QUEUE_INFO_PRI);
}
static int hinic_tx_offload(struct sk_buff *skb, struct hinic_sq_task *task,
u32 *queue_info)
{
enum hinic_offload_type offload = 0;
u16 vlan_tag;
int enabled;
enabled = offload_tso(task, queue_info, skb);
if (enabled > 0) {
offload |= TX_OFFLOAD_TSO;
} else if (enabled == 0) {
enabled = offload_csum(task, queue_info, skb);
if (enabled)
offload |= TX_OFFLOAD_CSUM;
} else {
return -EPROTONOSUPPORT;
}
if (unlikely(skb_vlan_tag_present(skb))) {
vlan_tag = skb_vlan_tag_get(skb);
offload_vlan(task, queue_info, vlan_tag,
vlan_tag >> VLAN_PRIO_SHIFT);
offload |= TX_OFFLOAD_VLAN;
}
if (offload)
hinic_task_set_l2hdr(task, skb_network_offset(skb));
/* payload offset should not more than 221 */
if (HINIC_SQ_CTRL_GET(*queue_info, QUEUE_INFO_PLDOFF) >
MAX_PAYLOAD_OFFSET) {
return -EPROTONOSUPPORT;
}
/* mss should not less than 80 */
if (HINIC_SQ_CTRL_GET(*queue_info, QUEUE_INFO_MSS) < HINIC_MSS_MIN) {
*queue_info = HINIC_SQ_CTRL_CLEAR(*queue_info, QUEUE_INFO_MSS);
*queue_info |= HINIC_SQ_CTRL_SET(HINIC_MSS_MIN, QUEUE_INFO_MSS);
}
return 0;
}
netdev_tx_t hinic_lb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{
struct hinic_dev *nic_dev = netdev_priv(netdev);
u16 prod_idx, q_id = skb->queue_mapping;
struct netdev_queue *netdev_txq;
int nr_sges, err = NETDEV_TX_OK;
struct hinic_sq_wqe *sq_wqe;
unsigned int wqe_size;
struct hinic_txq *txq;
struct hinic_qp *qp;
txq = &nic_dev->txqs[q_id];
qp = container_of(txq->sq, struct hinic_qp, sq);
nr_sges = skb_shinfo(skb)->nr_frags + 1;
err = tx_map_skb(nic_dev, skb, txq->sges);
if (err)
goto skb_error;
wqe_size = HINIC_SQ_WQE_SIZE(nr_sges);
sq_wqe = hinic_sq_get_wqe(txq->sq, wqe_size, &prod_idx);
if (!sq_wqe) {
netif_stop_subqueue(netdev, qp->q_id);
sq_wqe = hinic_sq_get_wqe(txq->sq, wqe_size, &prod_idx);
if (sq_wqe) {
netif_wake_subqueue(nic_dev->netdev, qp->q_id);
goto process_sq_wqe;
}
tx_unmap_skb(nic_dev, skb, txq->sges);
u64_stats_update_begin(&txq->txq_stats.syncp);
txq->txq_stats.tx_busy++;
u64_stats_update_end(&txq->txq_stats.syncp);
err = NETDEV_TX_BUSY;
wqe_size = 0;
goto flush_skbs;
}
process_sq_wqe:
hinic_sq_prepare_wqe(txq->sq, sq_wqe, txq->sges, nr_sges);
hinic_sq_write_wqe(txq->sq, prod_idx, sq_wqe, skb, wqe_size);
flush_skbs:
netdev_txq = netdev_get_tx_queue(netdev, q_id);
if ((!netdev_xmit_more()) || (netif_xmit_stopped(netdev_txq)))
hinic_sq_write_db(txq->sq, prod_idx, wqe_size, 0);
return err;
skb_error:
dev_kfree_skb_any(skb);
u64_stats_update_begin(&txq->txq_stats.syncp);
txq->txq_stats.tx_dropped++;
u64_stats_update_end(&txq->txq_stats.syncp);
return NETDEV_TX_OK;
}
netdev_tx_t hinic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{
struct hinic_dev *nic_dev = netdev_priv(netdev);
u16 prod_idx, q_id = skb->queue_mapping;
struct netdev_queue *netdev_txq;
int nr_sges, err = NETDEV_TX_OK;
struct hinic_sq_wqe *sq_wqe;
unsigned int wqe_size;
struct hinic_txq *txq;
struct hinic_qp *qp;
txq = &nic_dev->txqs[q_id];
qp = container_of(txq->sq, struct hinic_qp, sq);
if (skb->len < MIN_SKB_LEN) {
if (skb_pad(skb, MIN_SKB_LEN - skb->len)) {
netdev_err(netdev, "Failed to pad skb\n");
goto update_error_stats;
}
skb->len = MIN_SKB_LEN;
}
nr_sges = skb_shinfo(skb)->nr_frags + 1;
if (nr_sges > 17) {
u64_stats_update_begin(&txq->txq_stats.syncp);
txq->txq_stats.big_frags_pkts++;
u64_stats_update_end(&txq->txq_stats.syncp);
}
if (nr_sges > txq->max_sges) {
netdev_err(netdev, "Too many Tx sges\n");
goto skb_error;
}
err = tx_map_skb(nic_dev, skb, txq->sges);
if (err)
goto skb_error;
wqe_size = HINIC_SQ_WQE_SIZE(nr_sges);
sq_wqe = hinic_sq_get_wqe(txq->sq, wqe_size, &prod_idx);
if (!sq_wqe) {
netif_stop_subqueue(netdev, qp->q_id);
/* Check for the case free_tx_poll is called in another cpu
* and we stopped the subqueue after free_tx_poll check.
*/
sq_wqe = hinic_sq_get_wqe(txq->sq, wqe_size, &prod_idx);
if (sq_wqe) {
netif_wake_subqueue(nic_dev->netdev, qp->q_id);
goto process_sq_wqe;
}
tx_unmap_skb(nic_dev, skb, txq->sges);
u64_stats_update_begin(&txq->txq_stats.syncp);
txq->txq_stats.tx_busy++;
u64_stats_update_end(&txq->txq_stats.syncp);
err = NETDEV_TX_BUSY;
wqe_size = 0;
goto flush_skbs;
}
process_sq_wqe:
hinic_sq_prepare_wqe(txq->sq, sq_wqe, txq->sges, nr_sges);
err = hinic_tx_offload(skb, &sq_wqe->task, &sq_wqe->ctrl.queue_info);
if (err)
goto offload_error;
hinic_sq_write_wqe(txq->sq, prod_idx, sq_wqe, skb, wqe_size);
flush_skbs:
netdev_txq = netdev_get_tx_queue(netdev, q_id);
if ((!netdev_xmit_more()) || (netif_xmit_stopped(netdev_txq)))
hinic_sq_write_db(txq->sq, prod_idx, wqe_size, 0);
return err;
offload_error:
hinic_sq_return_wqe(txq->sq, wqe_size);
tx_unmap_skb(nic_dev, skb, txq->sges);
skb_error:
dev_kfree_skb_any(skb);
update_error_stats:
u64_stats_update_begin(&txq->txq_stats.syncp);
txq->txq_stats.tx_dropped++;
u64_stats_update_end(&txq->txq_stats.syncp);
return NETDEV_TX_OK;
}
/**
* tx_free_skb - unmap and free skb
* @nic_dev: nic device
* @skb: the skb
* @sges: the sges that are connected to the skb
**/
static void tx_free_skb(struct hinic_dev *nic_dev, struct sk_buff *skb,
struct hinic_sge *sges)
{
tx_unmap_skb(nic_dev, skb, sges);
dev_kfree_skb_any(skb);
}
/**
* free_all_tx_skbs - free all skbs in tx queue
* @txq: tx queue
**/
static void free_all_tx_skbs(struct hinic_txq *txq)
{
struct hinic_dev *nic_dev = netdev_priv(txq->netdev);
struct hinic_sq *sq = txq->sq;
struct hinic_sq_wqe *sq_wqe;
unsigned int wqe_size;
struct sk_buff *skb;
int nr_sges;
u16 ci;
while ((sq_wqe = hinic_sq_read_wqebb(sq, &skb, &wqe_size, &ci))) {
sq_wqe = hinic_sq_read_wqe(sq, &skb, wqe_size, &ci);
if (!sq_wqe)
break;
nr_sges = skb_shinfo(skb)->nr_frags + 1;
hinic_sq_get_sges(sq_wqe, txq->free_sges, nr_sges);
hinic_sq_put_wqe(sq, wqe_size);
tx_free_skb(nic_dev, skb, txq->free_sges);
}
}
/**
* free_tx_poll - free finished tx skbs in tx queue that connected to napi
* @napi: napi
* @budget: number of tx
*
* Return 0 - Success, negative - Failure
**/
static int free_tx_poll(struct napi_struct *napi, int budget)
{
struct hinic_txq *txq = container_of(napi, struct hinic_txq, napi);
struct hinic_qp *qp = container_of(txq->sq, struct hinic_qp, sq);
struct hinic_dev *nic_dev = netdev_priv(txq->netdev);
struct netdev_queue *netdev_txq;
struct hinic_sq *sq = txq->sq;
struct hinic_wq *wq = sq->wq;
struct hinic_sq_wqe *sq_wqe;
unsigned int wqe_size;
int nr_sges, pkts = 0;
struct sk_buff *skb;
u64 tx_bytes = 0;
u16 hw_ci, sw_ci;
do {
hw_ci = HW_CONS_IDX(sq) & wq->mask;
dma_rmb();
/* Reading a WQEBB to get real WQE size and consumer index. */
sq_wqe = hinic_sq_read_wqebb(sq, &skb, &wqe_size, &sw_ci);
if (!sq_wqe ||
(((hw_ci - sw_ci) & wq->mask) * wq->wqebb_size < wqe_size))
break;
/* If this WQE have multiple WQEBBs, we will read again to get
* full size WQE.
*/
if (wqe_size > wq->wqebb_size) {
sq_wqe = hinic_sq_read_wqe(sq, &skb, wqe_size, &sw_ci);
if (unlikely(!sq_wqe))
break;
}
tx_bytes += skb->len;
pkts++;
nr_sges = skb_shinfo(skb)->nr_frags + 1;
hinic_sq_get_sges(sq_wqe, txq->free_sges, nr_sges);
hinic_sq_put_wqe(sq, wqe_size);
tx_free_skb(nic_dev, skb, txq->free_sges);
} while (pkts < budget);
if (__netif_subqueue_stopped(nic_dev->netdev, qp->q_id) &&
hinic_get_sq_free_wqebbs(sq) >= HINIC_MIN_TX_NUM_WQEBBS(sq)) {
netdev_txq = netdev_get_tx_queue(txq->netdev, qp->q_id);
__netif_tx_lock(netdev_txq, smp_processor_id());
if (!netif_testing(nic_dev->netdev))
netif_wake_subqueue(nic_dev->netdev, qp->q_id);
__netif_tx_unlock(netdev_txq);
u64_stats_update_begin(&txq->txq_stats.syncp);
txq->txq_stats.tx_wake++;
u64_stats_update_end(&txq->txq_stats.syncp);
}
u64_stats_update_begin(&txq->txq_stats.syncp);
txq->txq_stats.bytes += tx_bytes;
txq->txq_stats.pkts += pkts;
u64_stats_update_end(&txq->txq_stats.syncp);
if (pkts < budget) {
napi_complete(napi);
if (!HINIC_IS_VF(nic_dev->hwdev->hwif))
hinic_hwdev_set_msix_state(nic_dev->hwdev,
sq->msix_entry,
HINIC_MSIX_ENABLE);
return pkts;
}
return budget;
}
static irqreturn_t tx_irq(int irq, void *data)
{
struct hinic_txq *txq = data;
struct hinic_dev *nic_dev;
nic_dev = netdev_priv(txq->netdev);
if (!HINIC_IS_VF(nic_dev->hwdev->hwif))
/* Disable the interrupt until napi will be completed */
hinic_hwdev_set_msix_state(nic_dev->hwdev,
txq->sq->msix_entry,
HINIC_MSIX_DISABLE);
hinic_hwdev_msix_cnt_set(nic_dev->hwdev, txq->sq->msix_entry);
napi_schedule(&txq->napi);
return IRQ_HANDLED;
}
static int tx_request_irq(struct hinic_txq *txq)
{
struct hinic_dev *nic_dev = netdev_priv(txq->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_hwif *hwif = hwdev->hwif;
struct pci_dev *pdev = hwif->pdev;
struct hinic_sq *sq = txq->sq;
struct hinic_qp *qp;
int err;
qp = container_of(sq, struct hinic_qp, sq);
netif_napi_add_weight(txq->netdev, &txq->napi, free_tx_poll,
nic_dev->tx_weight);
hinic_hwdev_msix_set(nic_dev->hwdev, sq->msix_entry,
TX_IRQ_NO_PENDING, TX_IRQ_NO_COALESC,
TX_IRQ_NO_LLI_TIMER, TX_IRQ_NO_CREDIT,
TX_IRQ_NO_RESEND_TIMER);
intr_coal = &nic_dev->tx_intr_coalesce[qp->q_id];
interrupt_info.msix_index = sq->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, txq->netdev,
"Failed to set TX interrupt coalescing attribute\n");
netif_napi_del(&txq->napi);
return err;
}
err = request_irq(sq->irq, tx_irq, 0, txq->irq_name, txq);
if (err) {
dev_err(&pdev->dev, "Failed to request Tx irq\n");
netif_napi_del(&txq->napi);
return err;
}
return 0;
}
static void tx_free_irq(struct hinic_txq *txq)
{
struct hinic_sq *sq = txq->sq;
free_irq(sq->irq, txq);
netif_napi_del(&txq->napi);
}
/**
* hinic_init_txq - Initialize the Tx Queue
* @txq: Logical Tx Queue
* @sq: Hardware Tx Queue to connect the Logical queue with
* @netdev: network device to connect the Logical queue with
*
* Return 0 - Success, negative - Failure
**/
int hinic_init_txq(struct hinic_txq *txq, struct hinic_sq *sq,
struct net_device *netdev)
{
struct hinic_qp *qp = container_of(sq, struct hinic_qp, sq);
struct hinic_dev *nic_dev = netdev_priv(netdev);
struct hinic_hwdev *hwdev = nic_dev->hwdev;
int err;
txq->netdev = netdev;
txq->sq = sq;
txq_stats_init(txq);
txq->max_sges = HINIC_MAX_SQ_BUFDESCS;
txq->sges = devm_kcalloc(&netdev->dev, txq->max_sges,
sizeof(*txq->sges), GFP_KERNEL);
if (!txq->sges)
return -ENOMEM;
txq->free_sges = devm_kcalloc(&netdev->dev, txq->max_sges,
sizeof(*txq->free_sges), GFP_KERNEL);
if (!txq->free_sges) {
err = -ENOMEM;
goto err_alloc_free_sges;
}
txq->irq_name = devm_kasprintf(&netdev->dev, GFP_KERNEL, "%s_txq%d",
netdev->name, qp->q_id);
if (!txq->irq_name) {
err = -ENOMEM;
goto err_alloc_irqname;
}
err = hinic_hwdev_hw_ci_addr_set(hwdev, sq, CI_UPDATE_NO_PENDING,
CI_UPDATE_NO_COALESC);
if (err)
goto err_hw_ci;
err = tx_request_irq(txq);
if (err) {
netdev_err(netdev, "Failed to request Tx irq\n");
goto err_req_tx_irq;
}
return 0;
err_req_tx_irq:
err_hw_ci:
devm_kfree(&netdev->dev, txq->irq_name);
err_alloc_irqname:
devm_kfree(&netdev->dev, txq->free_sges);
err_alloc_free_sges:
devm_kfree(&netdev->dev, txq->sges);
return err;
}
/**
* hinic_clean_txq - Clean the Tx Queue
* @txq: Logical Tx Queue
**/
void hinic_clean_txq(struct hinic_txq *txq)
{
struct net_device *netdev = txq->netdev;
tx_free_irq(txq);
free_all_tx_skbs(txq);
devm_kfree(&netdev->dev, txq->irq_name);
devm_kfree(&netdev->dev, txq->free_sges);
devm_kfree(&netdev->dev, txq->sges);
}
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