From 9a06bec9aee0ae54f175b20a8d4f5e14aef24a9f Mon Sep 17 00:00:00 2001
From: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Date: Tue, 28 Oct 2014 16:51:27 +0200
Subject: [PATCH] wil6210: Add support for large packets
It is possible to configure driver using mtu_max module parameter
by setting it to value in range of 68..7920 inclusive.
This is sub-optimal performance-wise in case packet is larger than 1 page.
mtu_max default value is 2228.
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---
drivers/net/wireless/ath/wil6210/main.c | 29 ++++++++++++++++++++++
drivers/net/wireless/ath/wil6210/netdev.c | 2 +-
drivers/net/wireless/ath/wil6210/txrx.c | 7 +++---
drivers/net/wireless/ath/wil6210/txrx.h | 4 +--
drivers/net/wireless/ath/wil6210/wil6210.h | 1 +
drivers/net/wireless/ath/wil6210/wmi.c | 2 +-
6 files changed, 38 insertions(+), 7 deletions(-)
diff --git a/drivers/net/wireless/ath/wil6210/main.c b/drivers/net/wireless/ath/wil6210/main.c
index 92705c0d97a4b..6212983fede27 100644
--- a/drivers/net/wireless/ath/wil6210/main.c
+++ b/drivers/net/wireless/ath/wil6210/main.c
@@ -38,6 +38,35 @@ static unsigned int itr_trsh = WIL6210_ITR_TRSH_DEFAULT;
module_param(itr_trsh, uint, S_IRUGO);
MODULE_PARM_DESC(itr_trsh, " Interrupt moderation threshold, usecs.");
+/* We allow allocation of more than 1 page buffers to support large packets.
+ * It is suboptimal behavior performance wise in case MTU above page size.
+ */
+unsigned int mtu_max = TXRX_BUF_LEN_DEFAULT - ETH_HLEN;
+static int mtu_max_set(const char *val, const struct kernel_param *kp)
+{
+ int ret;
+
+ /* sets mtu_max directly. no need to restore it in case of
+ * illegal value since we assume this will fail insmod
+ */
+ ret = param_set_uint(val, kp);
+ if (ret)
+ return ret;
+
+ if (mtu_max < 68 || mtu_max > IEEE80211_MAX_DATA_LEN_DMG)
+ ret = -EINVAL;
+
+ return ret;
+}
+
+static struct kernel_param_ops mtu_max_ops = {
+ .set = mtu_max_set,
+ .get = param_get_uint,
+};
+
+module_param_cb(mtu_max, &mtu_max_ops, &mtu_max, S_IRUGO);
+MODULE_PARM_DESC(mtu_max, " Max MTU value.");
+
#define RST_DELAY (20) /* msec, for loop in @wil_target_reset */
#define RST_COUNT (1 + 1000/RST_DELAY) /* round up to be above 1 sec total */
diff --git a/drivers/net/wireless/ath/wil6210/netdev.c b/drivers/net/wireless/ath/wil6210/netdev.c
index 239965106c05d..e81703ca7701c 100644
--- a/drivers/net/wireless/ath/wil6210/netdev.c
+++ b/drivers/net/wireless/ath/wil6210/netdev.c
@@ -41,7 +41,7 @@ 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 > (TX_BUF_LEN - ETH_HLEN)) {
+ if (new_mtu < 68 || new_mtu > mtu_max) {
wil_err(wil, "invalid MTU %d\n", new_mtu);
return -EINVAL;
}
diff --git a/drivers/net/wireless/ath/wil6210/txrx.c b/drivers/net/wireless/ath/wil6210/txrx.c
index 2936ef0c18cbc..c680906bc0dc6 100644
--- a/drivers/net/wireless/ath/wil6210/txrx.c
+++ b/drivers/net/wireless/ath/wil6210/txrx.c
@@ -206,7 +206,7 @@ static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring,
u32 i, int headroom)
{
struct device *dev = wil_to_dev(wil);
- unsigned int sz = RX_BUF_LEN;
+ unsigned int sz = mtu_max + ETH_HLEN;
struct vring_rx_desc dd, *d = ⅆ
volatile struct vring_rx_desc *_d = &vring->va[i].rx;
dma_addr_t pa;
@@ -385,7 +385,7 @@ static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
struct vring_rx_desc *d;
struct sk_buff *skb;
dma_addr_t pa;
- unsigned int sz = RX_BUF_LEN;
+ unsigned int sz = mtu_max + ETH_HLEN;
u16 dmalen;
u8 ftype;
u8 ds_bits;
@@ -646,7 +646,8 @@ int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size,
.action = cpu_to_le32(WMI_VRING_CMD_ADD),
.vring_cfg = {
.tx_sw_ring = {
- .max_mpdu_size = cpu_to_le16(TX_BUF_LEN),
+ .max_mpdu_size =
+ cpu_to_le16(mtu_max + ETH_HLEN),
.ring_size = cpu_to_le16(size),
},
.ringid = id,
diff --git a/drivers/net/wireless/ath/wil6210/txrx.h b/drivers/net/wireless/ath/wil6210/txrx.h
index de046716d2b7e..630aeb5fa7f4a 100644
--- a/drivers/net/wireless/ath/wil6210/txrx.h
+++ b/drivers/net/wireless/ath/wil6210/txrx.h
@@ -21,8 +21,8 @@
#define BUF_HW_OWNED (0)
/* size of max. Tx/Rx buffers, as supported by FW */
-#define RX_BUF_LEN (2242)
-#define TX_BUF_LEN (2242)
+#define TXRX_BUF_LEN_DEFAULT (2242)
+
/* how many bytes to reserve for rtap header? */
#define WIL6210_RTAP_SIZE (128)
diff --git a/drivers/net/wireless/ath/wil6210/wil6210.h b/drivers/net/wireless/ath/wil6210/wil6210.h
index 3674e2732192a..95d3a062d35c5 100644
--- a/drivers/net/wireless/ath/wil6210/wil6210.h
+++ b/drivers/net/wireless/ath/wil6210/wil6210.h
@@ -24,6 +24,7 @@
#include "wil_platform.h"
extern bool no_fw_recovery;
+extern unsigned int mtu_max;
#define WIL_NAME "wil6210"
#define WIL_FW_NAME "wil6210.fw"
diff --git a/drivers/net/wireless/ath/wil6210/wmi.c b/drivers/net/wireless/ath/wil6210/wmi.c
index 9661fa1501676..bb1e066f756a8 100644
--- a/drivers/net/wireless/ath/wil6210/wmi.c
+++ b/drivers/net/wireless/ath/wil6210/wmi.c
@@ -1025,7 +1025,7 @@ int wmi_rx_chain_add(struct wil6210_priv *wil, struct vring *vring)
struct wmi_cfg_rx_chain_cmd cmd = {
.action = WMI_RX_CHAIN_ADD,
.rx_sw_ring = {
- .max_mpdu_size = cpu_to_le16(RX_BUF_LEN),
+ .max_mpdu_size = cpu_to_le16(mtu_max + ETH_HLEN),
.ring_mem_base = cpu_to_le64(vring->pa),
.ring_size = cpu_to_le16(vring->size),
},
--
2.30.2