[PATCH 5.11 473/601] mt76: mt7663s: make all of packets 4-bytes aligned in sdio tx aggregation

Greg Kroah-Hartman
2021-05-12T17:55:49Z

From: Sean Wang <sean.wang@mediatek.com>

[ Upstream commit 455ae5aabcc72fed7e5c803d59d122415500dc08 ]

Each packet should be padded with the additional zero to become 4-bytes
alignment in sdio tx aggregation.

Fixes: 1522ff731f84 ("mt76: mt7663s: introduce sdio tx aggregation")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c b/drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c
index 9fb506f2ace6..37fe65ced4fd 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c
@@ -218,6 +218,7 @@ static int mt7663s_tx_run_queue(struct mt76_dev *dev, struct mt76_queue *q)
int qid, err, nframes = 0, len = 0, pse_sz = 0, ple_sz = 0;
bool mcu = q == dev->q_mcu[MT_MCUQ_WM];
struct mt76_sdio *sdio = &dev->sdio;
+ u8 pad;

qid = mcu ? ARRAY_SIZE(sdio->xmit_buf) - 1 : q->qid;
while (q->first != q->head) {
@@ -234,7 +235,8 @@ static int mt7663s_tx_run_queue(struct mt76_dev *dev, struct mt76_queue *q)
goto next;
}

- if (len + e->skb->len + 4 > MT76S_XMIT_BUF_SZ)
+ pad = roundup(e->skb->len, 4) - e->skb->len;
+ if (len + e->skb->len + pad + 4 > MT76S_XMIT_BUF_SZ)
break;

if (mt7663s_tx_pick_quota(sdio, mcu, e->buf_sz, &pse_sz,
@@ -252,6 +254,11 @@ static int mt7663s_tx_run_queue(struct mt76_dev *dev, struct mt76_queue *q)
len += iter->len;
nframes++;
}
+
+ if (unlikely(pad)) {
+ memset(sdio->xmit_buf[qid] + len, 0, pad);
+ len += pad;
+ }
next:
q->first = (q->first + 1) % q->ndesc;
e->done = true;
--
2.30.2