[PATCH v2] ath10k: drop the TX packet which size exceed credit size for sdio

[PATCH v2] ath10k: drop the TX packet which size exceed credit size for sdio

[Wen Gong]

sdio chip use DMA buffer to receive TX packet from ath10k, and it has
limitation of each buffer, if the packet size exceed the credit size,
it will trigger error in firmware.

Tested with QCA6174 SDIO with firmware
WLAN.RMH.4.4.1-00017-QCARMSWP-1.

Signed-off-by: Wen Gong <wgong@codeaurora.org>
---
v2: rebase to ath-next
 drivers/net/wireless/ath/ath10k/htc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/wireless/ath/ath10k/htc.c b/drivers/net/wireless/ath/ath10k/htc.c
index 58ceba75d20a..31df6dd04bf6 100644
--- a/drivers/net/wireless/ath/ath10k/htc.c
+++ b/drivers/net/wireless/ath/ath10k/htc.c
@@ -846,6 +846,11 @@ int ath10k_htc_send_hl(struct ath10k_htc *htc,
 	struct ath10k_htc_ep *ep = &htc->endpoint[eid];
 	struct ath10k *ar = htc->ar;
 
+	if (sizeof(struct ath10k_htc_hdr) + skb->len > ep->tx_credit_size) {
+		ath10k_dbg(ar, ATH10K_DBG_HTC, "tx exceed max len %d\n", skb->len);
+		return -ENOMEM;
+	}
+
 	ath10k_dbg(ar, ATH10K_DBG_HTC, "htc send hl eid %d bundle %d tx count %d len %d\n",
 		   eid, ep->bundle_tx, skb_queue_len(&ep->tx_req_head), skb->len);
 
-- 
2.23.0

Re: [PATCH v2] ath10k: drop the TX packet which size exceed credit size for sdio

[Kalle Valo]

Wen Gong <wgong@codeaurora.org> wrote:

> sdio chip use DMA buffer to receive TX packet from ath10k, and it has
> limitation of each buffer, if the packet size exceed the credit size,
> it will trigger error in firmware.
> 
> Tested with QCA6174 SDIO with firmware
> WLAN.RMH.4.4.1-00017-QCARMSWP-1.
> 
> Signed-off-by: Wen Gong <wgong@codeaurora.org>
> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Patch applied to ath-next branch of ath.git, thanks.

8347784d6f5f ath10k: drop the TX packet which size exceed credit size for sdio

-- 
https://patchwork.kernel.org/patch/11503309/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches