From 34d612d9edaa3250f832acd556f522efcb7c90aa Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Thu, 18 Jan 2018 19:29:12 +0100 Subject: [PATCH] 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 --- dma.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/dma.c b/dma.c index ecd409a4..e539b383 100644 --- a/dma.c +++ b/dma.c @@ -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; }