[PATCH 4.4 08/47] ath10k: fix rfc1042 header retrieval in QCA4019 with eth decap mode

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vasanthakumar Thiagarajan <vthiagar@xxxxxxxxxxxxxxxx>

commit 2f38c3c01de945234d23dd163e3528ccb413066d upstream.

Chipset from QCA99X0 onwards (QCA99X0, QCA9984, QCA4019 & future)
rx_hdr_status is not padded to align in 4-byte boundary. Define a
new hw_params field to handle different alignment behaviour between
different hw. This patch fixes improper retrieval of rfc1042 header
with QCA4019. This patch along with "ath10k: Properly remove padding
from the start of rx payload" will fix traffic failure in ethernet
decap mode for QCA4019.

Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@xxxxxxxxxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxxxx>
[bwh: This just adds the part that was left out of the previous backport,
 commit b88fb9ea475a.]
Signed-off-by: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/wireless/ath/ath10k/htt_rx.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/ath/ath10k/htt_rx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
@@ -1166,6 +1166,7 @@ static void *ath10k_htt_rx_h_find_rfc104
 	size_t hdr_len, crypto_len;
 	void *rfc1042;
 	bool is_first, is_last, is_amsdu;
+	int bytes_aligned = ar->hw_params.decap_align_bytes;
 
 	rxd = (void *)msdu->data - sizeof(*rxd);
 	hdr = (void *)rxd->rx_hdr_status;
@@ -1182,8 +1183,8 @@ static void *ath10k_htt_rx_h_find_rfc104
 		hdr_len = ieee80211_hdrlen(hdr->frame_control);
 		crypto_len = ath10k_htt_rx_crypto_param_len(ar, enctype);
 
-		rfc1042 += round_up(hdr_len, 4) +
-			   round_up(crypto_len, 4);
+		rfc1042 += round_up(hdr_len, bytes_aligned) +
+			   round_up(crypto_len, bytes_aligned);
 	}
 
 	if (is_amsdu)