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ionic: fix txrx work accounting 

Take the tx accounting out of the work_done calculation to
prevent a possible duplicate napi_schedule call when under
high Tx stress but low Rx traffic.

Fixes: b14e4e95f9 ("ionic: tx separate servicing")
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shannon Nelson 2020-08-27 16:44:22 -07:00 committed by David S. Miller
parent e9d572d94e
commit 9dda51101a
1 changed files with 3 additions and 10 deletions
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13
drivers/net/ethernet/pensando/ionic/ionic_txrx.c
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@ -496,9 +496,7 @@ int ionic_txrx_napi(struct napi_struct *napi, int budget)
struct ionic_cq *txcq;
u32 rx_work_done = 0;
u32 tx_work_done = 0;
u32 work_done = 0;
u32 flags = 0;
bool unmask;
lif = rxcq->bound_q->lif;
idev = &lif->ionic->idev;
@ -512,17 +510,12 @@ int ionic_txrx_napi(struct napi_struct *napi, int budget)
if (rx_work_done)
ionic_rx_fill_cb(rxcq->bound_q);
unmask = (rx_work_done < budget) && (tx_work_done < lif->tx_budget);
if (unmask && napi_complete_done(napi, rx_work_done)) {
if (rx_work_done < budget && napi_complete_done(napi, rx_work_done)) {
flags |= IONIC_INTR_CRED_UNMASK;
DEBUG_STATS_INTR_REARM(rxcq->bound_intr);
work_done = rx_work_done;
} else {
work_done = budget;
}
if (work_done || flags) {
if (rx_work_done || flags) {
flags |= IONIC_INTR_CRED_RESET_COALESCE;
ionic_intr_credits(idev->intr_ctrl, rxcq->bound_intr->index,
tx_work_done + rx_work_done, flags);
@ -531,7 +524,7 @@ int ionic_txrx_napi(struct napi_struct *napi, int budget)
DEBUG_STATS_NAPI_POLL(qcq, rx_work_done);
DEBUG_STATS_NAPI_POLL(qcq, tx_work_done);
return work_done;
return rx_work_done;
}
static dma_addr_t ionic_tx_map_single(struct ionic_queue *q,