Clarify how each decap mode works in one place.
Signed-off-by: Michal Kazior <michal.kazior@xxxxxxxxx>
---
drivers/net/wireless/ath/ath10k/rx_desc.h | 24 ++++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/ath/ath10k/rx_desc.h b/drivers/net/wireless/ath/ath10k/rx_desc.h
index bfec6c8..1c584c4 100644
--- a/drivers/net/wireless/ath/ath10k/rx_desc.h
+++ b/drivers/net/wireless/ath/ath10k/rx_desc.h
@@ -422,10 +422,30 @@ struct rx_mpdu_end {
#define RX_MSDU_START_INFO1_IP_FRAG (1 << 14)
#define RX_MSDU_START_INFO1_TCP_ONLY_ACK (1 << 15)
+/* The decapped header (rx_hdr_status) contains the following:
+ * a) 802.11 header
+ * [padding to 4 bytes]
+ * b) HW crypto parameter
+ * - 0 bytes for no security
+ * - 4 bytes for WEP
+ * - 8 bytes for TKIP, AES
+ * [padding to 4 bytes]
+ * c) A-MSDU subframe header (14 bytes) if appliable
+ * d) LLC/SNAP (RFC1042, 8 bytes)
+ *
+ * In case of A-MSDU only first frame in sequence contains (a) and (b). */
enum rx_msdu_decap_format {
- RX_MSDU_DECAP_RAW = 0,
- RX_MSDU_DECAP_NATIVE_WIFI = 1,
+ RX_MSDU_DECAP_RAW = 0,
+
+ /* Note: QoS frames are reported as non-QoS. The rx_hdr_status in
+ * htt_rx_desc contains the original decapped 802.11 header. */
+ RX_MSDU_DECAP_NATIVE_WIFI = 1,
+
+ /* Payload contains an ethernet header (struct ethhdr). */
RX_MSDU_DECAP_ETHERNET2_DIX = 2,
+
+ /* Payload contains two 48-bit addresses and 2-byte length (14 bytes
+ * total), followed by an RFC1042 header (8 bytes). */
RX_MSDU_DECAP_8023_SNAP_LLC = 3
};
--
1.7.9.5
--
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