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net: thunderx: Wakeup TXQ only if CQE_TX are processed 

Previously TXQ is wakedup whenever napi is executed
and irrespective of if any CQE_TX are processed or not.
Added 'txq_stop' and 'txq_wake' counters to aid in debugging
if there are any future issues.

Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sunil Goutham 2015-07-29 16:49:42 +03:00 committed by David S. Miller
parent f8ce9666fa
commit 74840b83bd
3 changed files with 31 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/net/ethernet/cavium/thunder/nic.h
View File

@ -216,8 +216,9 @@ struct nicvf_drv_stats {
/* Tx */
u64 tx_frames_ok;
u64 tx_drops;
u64 tx_busy;
u64 tx_tso;
u64 txq_stop;
u64 txq_wake;
};
struct nicvf {

3
drivers/net/ethernet/cavium/thunder/nicvf_ethtool.c
View File

@ -66,9 +66,10 @@ static const struct nicvf_stat nicvf_drv_stats[] = {
NICVF_DRV_STAT(rx_frames_jumbo),
NICVF_DRV_STAT(rx_drops),
NICVF_DRV_STAT(tx_frames_ok),
NICVF_DRV_STAT(tx_busy),
NICVF_DRV_STAT(tx_tso),
NICVF_DRV_STAT(tx_drops),
NICVF_DRV_STAT(txq_stop),
NICVF_DRV_STAT(txq_wake),
};
static const struct nicvf_stat nicvf_queue_stats[] = {

40
drivers/net/ethernet/cavium/thunder/nicvf_main.c
View File

@ -477,12 +477,13 @@ static void nicvf_rcv_pkt_handler(struct net_device *netdev,
static int nicvf_cq_intr_handler(struct net_device *netdev, u8 cq_idx,
struct napi_struct *napi, int budget)
{
int processed_cqe, work_done = 0;
int processed_cqe, work_done = 0, tx_done = 0;
int cqe_count, cqe_head;
struct nicvf *nic = netdev_priv(netdev);
struct queue_set *qs = nic->qs;
struct cmp_queue *cq = &qs->cq[cq_idx];
struct cqe_rx_t *cq_desc;
struct netdev_queue *txq;
spin_lock_bh(&cq->lock);
loop:
@ -497,8 +498,8 @@ static int nicvf_cq_intr_handler(struct net_device *netdev, u8 cq_idx,
cqe_head = nicvf_queue_reg_read(nic, NIC_QSET_CQ_0_7_HEAD, cq_idx) >> 9;
cqe_head &= 0xFFFF;
netdev_dbg(nic->netdev, "%s cqe_count %d cqe_head %d\n",
__func__, cqe_count, cqe_head);
netdev_dbg(nic->netdev, "%s CQ%d cqe_count %d cqe_head %d\n",
__func__, cq_idx, cqe_count, cqe_head);
while (processed_cqe < cqe_count) {
/* Get the CQ descriptor */
cq_desc = (struct cqe_rx_t *)GET_CQ_DESC(cq, cqe_head);
@ -512,8 +513,8 @@ static int nicvf_cq_intr_handler(struct net_device *netdev, u8 cq_idx,
break;
}
netdev_dbg(nic->netdev, "cq_desc->cqe_type %d\n",
cq_desc->cqe_type);
netdev_dbg(nic->netdev, "CQ%d cq_desc->cqe_type %d\n",
cq_idx, cq_desc->cqe_type);
switch (cq_desc->cqe_type) {
case CQE_TYPE_RX:
nicvf_rcv_pkt_handler(netdev, napi, cq,
@ -523,6 +524,7 @@ static int nicvf_cq_intr_handler(struct net_device *netdev, u8 cq_idx,
case CQE_TYPE_SEND:
nicvf_snd_pkt_handler(netdev, cq,
(void *)cq_desc, CQE_TYPE_SEND);
tx_done++;
break;
case CQE_TYPE_INVALID:
case CQE_TYPE_RX_SPLIT:
@ -533,8 +535,9 @@ static int nicvf_cq_intr_handler(struct net_device *netdev, u8 cq_idx,
}
processed_cqe++;
}
netdev_dbg(nic->netdev, "%s processed_cqe %d work_done %d budget %d\n",
__func__, processed_cqe, work_done, budget);
netdev_dbg(nic->netdev,
"%s CQ%d processed_cqe %d work_done %d budget %d\n",
__func__, cq_idx, processed_cqe, work_done, budget);
/* Ring doorbell to inform H/W to reuse processed CQEs */
nicvf_queue_reg_write(nic, NIC_QSET_CQ_0_7_DOOR,
@ -544,6 +547,19 @@ static int nicvf_cq_intr_handler(struct net_device *netdev, u8 cq_idx,
goto loop;
done:
/* Wakeup TXQ if its stopped earlier due to SQ full */
if (tx_done) {
txq = netdev_get_tx_queue(netdev, cq_idx);
if (netif_tx_queue_stopped(txq)) {
netif_tx_wake_queue(txq);
nic->drv_stats.txq_wake++;
if (netif_msg_tx_err(nic))
netdev_warn(netdev,
"%s: Transmit queue wakeup SQ%d\n",
netdev->name, cq_idx);
}
}
spin_unlock_bh(&cq->lock);
return work_done;
}
@ -555,15 +571,10 @@ static int nicvf_poll(struct napi_struct *napi, int budget)
struct net_device *netdev = napi->dev;
struct nicvf *nic = netdev_priv(netdev);
struct nicvf_cq_poll *cq;
struct netdev_queue *txq;
cq = container_of(napi, struct nicvf_cq_poll, napi);
work_done = nicvf_cq_intr_handler(netdev, cq->cq_idx, napi, budget);
txq = netdev_get_tx_queue(netdev, cq->cq_idx);
if (netif_tx_queue_stopped(txq))
netif_tx_wake_queue(txq);
if (work_done < budget) {
/* Slow packet rate, exit polling */
napi_complete(napi);
@ -836,7 +847,7 @@ static netdev_tx_t nicvf_xmit(struct sk_buff *skb, struct net_device *netdev)
if (!nicvf_sq_append_skb(nic, skb) && !netif_tx_queue_stopped(txq)) {
netif_tx_stop_queue(txq);
nic->drv_stats.tx_busy++;
nic->drv_stats.txq_stop++;
if (netif_msg_tx_err(nic))
netdev_warn(netdev,
"%s: Transmit ring full, stopping SQ%d\n",
@ -989,6 +1000,9 @@ int nicvf_open(struct net_device *netdev)
for (qidx = 0; qidx < qs->rbdr_cnt; qidx++)
nicvf_enable_intr(nic, NICVF_INTR_RBDR, qidx);
nic->drv_stats.txq_stop = 0;
nic->drv_stats.txq_wake = 0;
netif_carrier_on(netdev);
netif_tx_start_all_queues(netdev);