HW supports upto 2304 packet size on the air.
HW is responsible for adding (Tx) or removing (Rx) the following headers:
802.11 hdr: 26B
SNAP: 8B
CRC: 4B
Security (optional): 24B
HW adds max 62B to the payload passed from driver. It means driver can use
max packet size of 2304-62 = 2242B
Signed-off-by: Dedy Lansky <qca_dlansky@xxxxxxxxxxxxxxxx>
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@xxxxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/wil6210/netdev.c | 5 ++++-
drivers/net/wireless/ath/wil6210/txrx.c | 3 ++-
drivers/net/wireless/ath/wil6210/txrx.h | 6 +++---
3 files changed, 9 insertions(+), 5 deletions(-)
diff --git a/drivers/net/wireless/ath/wil6210/netdev.c b/drivers/net/wireless/ath/wil6210/netdev.c
index a995d9d..1c0c77d 100644
--- a/drivers/net/wireless/ath/wil6210/netdev.c
+++ b/drivers/net/wireless/ath/wil6210/netdev.c
@@ -17,6 +17,7 @@
#include <linux/etherdevice.h>
#include "wil6210.h"
+#include "txrx.h"
static int wil_open(struct net_device *ndev)
{
@@ -40,8 +41,10 @@ static int wil_change_mtu(struct net_device *ndev, int new_mtu)
{
struct wil6210_priv *wil = ndev_to_wil(ndev);
- if (new_mtu < 68 || new_mtu > IEEE80211_MAX_DATA_LEN_DMG)
+ if (new_mtu < 68 || new_mtu > (TX_BUF_LEN - ETH_HLEN)) {
+ wil_err(wil, "invalid MTU %d\n", new_mtu);
return -EINVAL;
+ }
wil_dbg_misc(wil, "change MTU %d -> %d\n", ndev->mtu, new_mtu);
ndev->mtu = new_mtu;
diff --git a/drivers/net/wireless/ath/wil6210/txrx.c b/drivers/net/wireless/ath/wil6210/txrx.c
index 02fd43d..2936ef0 100644
--- a/drivers/net/wireless/ath/wil6210/txrx.c
+++ b/drivers/net/wireless/ath/wil6210/txrx.c
@@ -668,7 +668,8 @@ int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size,
struct vring *vring = &wil->vring_tx[id];
struct vring_tx_data *txdata = &wil->vring_tx_data[id];
- wil_dbg_misc(wil, "%s()\n", __func__);
+ wil_dbg_misc(wil, "%s() max_mpdu_size %d\n", __func__,
+ cmd.vring_cfg.tx_sw_ring.max_mpdu_size);
if (vring->va) {
wil_err(wil, "Tx ring [%d] already allocated\n", id);
diff --git a/drivers/net/wireless/ath/wil6210/txrx.h b/drivers/net/wireless/ath/wil6210/txrx.h
index 979edf2..de04671 100644
--- a/drivers/net/wireless/ath/wil6210/txrx.h
+++ b/drivers/net/wireless/ath/wil6210/txrx.h
@@ -20,9 +20,9 @@
#define BUF_SW_OWNED (1)
#define BUF_HW_OWNED (0)
-/* size of max. Rx packet */
-#define RX_BUF_LEN (2048)
-#define TX_BUF_LEN (2048)
+/* size of max. Tx/Rx buffers, as supported by FW */
+#define RX_BUF_LEN (2242)
+#define TX_BUF_LEN (2242)
/* how many bytes to reserve for rtap header? */
#define WIL6210_RTAP_SIZE (128)
--
1.9.1
--
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