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mt76: retry rx polling as long as there is budget left 

Sending frames to mac80211 needs time, which could allow for more rx
packets to end up in the DMA ring. Retry polling until there are no more
frames left. Improves rx latency under load.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Felix Fietkau 2018-01-24 16:19:10 +01:00 committed by Kalle Valo
parent f7a611707b
commit 2b4307f538
1 changed files with 7 additions and 3 deletions
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10
drivers/net/wireless/mediatek/mt76/dma.c
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@ -387,17 +387,21 @@ static int
mt76_dma_rx_poll(struct napi_struct *napi, int budget)
{
struct mt76_dev *dev;
int qid, done;
int qid, done = 0, cur;
dev = container_of(napi->dev, struct mt76_dev, napi_dev);
qid = napi - dev->napi;
done = mt76_dma_rx_process(dev, &dev->q_rx[qid], budget);
do {
cur = mt76_dma_rx_process(dev, &dev->q_rx[qid], budget - done);
mt76_rx_complete(dev, qid);
done += cur;
} while (cur && done < budget);
if (done < budget) {
napi_complete(napi);
dev->drv->rx_poll_complete(dev, qid);
}
mt76_rx_complete(dev, qid);
return done;
}