From: Ping-Ke Shih <[email protected]>
This patchset is aim to reduce IO to improve TX/RX performance, and also I
cleanup the code to make it easier and simpler.
Ping-Ke Shih (3):
rtlwifi: Reduce IO in RX interrupt to boost throughput
rtlwifi: fix the wrong size to calculate fifo space
rtlwifi: cleanup the code that check whether TX ring is available
drivers/net/wireless/realtek/rtlwifi/pci.c | 13 ++---
drivers/net/wireless/realtek/rtlwifi/pci.h | 5 +-
.../net/wireless/realtek/rtlwifi/rtl8192ee/trx.c | 57 ++++------------------
3 files changed, 15 insertions(+), 60 deletions(-)
--
2.14.1
From: Ping-Ke Shih <[email protected]>
Give correct fifo size to calculate fifo space. Fortunately, the values of
RTL_PCI_MAX_RX_COUNT and TX_DESC_NUM_92E are the same in old code, so it
still works.
Signed-off-by: Steven Ting <[email protected]>
Signed-off-by: Ping-Ke Shih <[email protected]>
---
drivers/net/wireless/realtek/rtlwifi/pci.h | 4 ++--
drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.c | 6 ++++--
2 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.h b/drivers/net/wireless/realtek/rtlwifi/pci.h
index e7d070e8da2d..ed5de1218bd9 100644
--- a/drivers/net/wireless/realtek/rtlwifi/pci.h
+++ b/drivers/net/wireless/realtek/rtlwifi/pci.h
@@ -320,10 +320,10 @@ static inline void pci_write32_async(struct rtl_priv *rtlpriv,
writel(val, (u8 __iomem *)rtlpriv->io.pci_mem_start + addr);
}
-static inline u16 calc_fifo_space(u16 rp, u16 wp)
+static inline u16 calc_fifo_space(u16 rp, u16 wp, u16 size)
{
if (rp <= wp)
- return RTL_PCI_MAX_RX_COUNT - 1 + rp - wp;
+ return size - 1 + rp - wp;
return rp - wp - 1;
}
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.c
index 12255682e890..bc44d9d912d8 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.c
@@ -498,7 +498,8 @@ u16 rtl92ee_rx_desc_buff_remained_cnt(struct ieee80211_hw *hw, u8 queue_index)
if (!start_rx)
return 0;
- remind_cnt = calc_fifo_space(read_point, write_point);
+ remind_cnt = calc_fifo_space(read_point, write_point,
+ RTL_PCI_MAX_RX_COUNT);
if (remind_cnt == 0)
return 0;
@@ -560,7 +561,8 @@ u16 rtl92ee_get_available_desc(struct ieee80211_hw *hw, u8 q_idx)
current_tx_write_point = (u16)((tmp_4byte) & 0x0fff);
point_diff = calc_fifo_space(current_tx_read_point,
- current_tx_write_point);
+ current_tx_write_point,
+ TX_DESC_NUM_92E);
rtlpci->tx_ring[q_idx].avl_desc = point_diff;
return point_diff;
--
2.14.1
From: Ping-Ke Shih <[email protected]>
Remove the duplicate checking of TX ring's available number, and remove
the variable to store available number that can be calculated by
read/write pointers.
Signed-off-by: Steven Ting <[email protected]>
Signed-off-by: Ping-Ke Shih <[email protected]>
---
drivers/net/wireless/realtek/rtlwifi/pci.c | 8 ----
drivers/net/wireless/realtek/rtlwifi/pci.h | 1 -
.../net/wireless/realtek/rtlwifi/rtl8192ee/trx.c | 51 +++-------------------
3 files changed, 6 insertions(+), 54 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.c b/drivers/net/wireless/realtek/rtlwifi/pci.c
index ca3f4716c1b6..e544f4bcfae9 100644
--- a/drivers/net/wireless/realtek/rtlwifi/pci.c
+++ b/drivers/net/wireless/realtek/rtlwifi/pci.c
@@ -557,13 +557,6 @@ static void _rtl_pci_tx_isr(struct ieee80211_hw *hw, int prio)
else
entry = (u8 *)(&ring->desc[ring->idx]);
- if (rtlpriv->cfg->ops->get_available_desc &&
- rtlpriv->cfg->ops->get_available_desc(hw, prio) <= 1) {
- RT_TRACE(rtlpriv, (COMP_INTR | COMP_SEND), DBG_DMESG,
- "no available desc!\n");
- return;
- }
-
if (!rtlpriv->cfg->ops->is_tx_desc_closed(hw, prio, ring->idx))
return;
ring->idx = (ring->idx + 1) % ring->entries;
@@ -1251,7 +1244,6 @@ static int _rtl_pci_init_tx_ring(struct ieee80211_hw *hw,
rtlpci->tx_ring[prio].cur_tx_rp = 0;
rtlpci->tx_ring[prio].cur_tx_wp = 0;
- rtlpci->tx_ring[prio].avl_desc = entries;
}
/* alloc dma for this ring */
diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.h b/drivers/net/wireless/realtek/rtlwifi/pci.h
index ed5de1218bd9..3fb56c845a61 100644
--- a/drivers/net/wireless/realtek/rtlwifi/pci.h
+++ b/drivers/net/wireless/realtek/rtlwifi/pci.h
@@ -173,7 +173,6 @@ struct rtl8192_tx_ring {
/*add for new trx flow*/
struct rtl_tx_buffer_desc *buffer_desc; /*tx buffer descriptor*/
dma_addr_t buffer_desc_dma; /*tx bufferd desc dma memory*/
- u16 avl_desc; /* available_desc_to_write */
u16 cur_tx_wp; /* current_tx_write_point */
u16 cur_tx_rp; /* current_tx_read_point */
};
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.c
index bc44d9d912d8..4f7444331b07 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192ee/trx.c
@@ -549,7 +549,6 @@ static u16 get_desc_addr_fr_q_idx(u16 queue_index)
u16 rtl92ee_get_available_desc(struct ieee80211_hw *hw, u8 q_idx)
{
- struct rtl_pci *rtlpci = rtl_pcidev(rtl_pcipriv(hw));
struct rtl_priv *rtlpriv = rtl_priv(hw);
u16 point_diff = 0;
u16 current_tx_read_point = 0, current_tx_write_point = 0;
@@ -564,7 +563,6 @@ u16 rtl92ee_get_available_desc(struct ieee80211_hw *hw, u8 q_idx)
current_tx_write_point,
TX_DESC_NUM_92E);
- rtlpci->tx_ring[q_idx].avl_desc = point_diff;
return point_diff;
}
@@ -909,10 +907,6 @@ void rtl92ee_set_desc(struct ieee80211_hw *hw, u8 *pdesc, bool istx,
u8 desc_name, u8 *val)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
- u16 cur_tx_rp = 0;
- u16 cur_tx_wp = 0;
- static bool over_run;
- u32 tmp = 0;
u8 q_idx = *val;
bool dma64 = rtlpriv->cfg->mod_params->dma64;
@@ -933,38 +927,12 @@ void rtl92ee_set_desc(struct ieee80211_hw *hw, u8 *pdesc, bool istx,
return;
}
+ /* make sure tx desc is available by caller */
ring->cur_tx_wp = ((ring->cur_tx_wp + 1) % max_tx_desc);
- if (over_run) {
- ring->cur_tx_wp = 0;
- over_run = false;
- }
- if (ring->avl_desc > 1) {
- ring->avl_desc--;
-
- rtl_write_word(rtlpriv,
- get_desc_addr_fr_q_idx(q_idx),
- ring->cur_tx_wp);
- }
-
- if (ring->avl_desc < (max_tx_desc - 15)) {
- u16 point_diff = 0;
-
- tmp =
- rtl_read_dword(rtlpriv,
- get_desc_addr_fr_q_idx(q_idx));
- cur_tx_rp = (u16)((tmp >> 16) & 0x0fff);
- cur_tx_wp = (u16)(tmp & 0x0fff);
-
- ring->cur_tx_wp = cur_tx_wp;
- ring->cur_tx_rp = cur_tx_rp;
- point_diff = ((cur_tx_rp > cur_tx_wp) ?
- (cur_tx_rp - cur_tx_wp) :
- (TX_DESC_NUM_92E - 1 -
- cur_tx_wp + cur_tx_rp));
-
- ring->avl_desc = point_diff;
- }
+ rtl_write_word(rtlpriv,
+ get_desc_addr_fr_q_idx(q_idx),
+ ring->cur_tx_wp);
}
break;
}
@@ -1046,13 +1014,12 @@ bool rtl92ee_is_tx_desc_closed(struct ieee80211_hw *hw, u8 hw_queue, u16 index)
{
struct rtl_pci *rtlpci = rtl_pcidev(rtl_pcipriv(hw));
struct rtl_priv *rtlpriv = rtl_priv(hw);
- u16 read_point, write_point, available_desc_num;
+ u16 read_point, write_point;
bool ret = false;
static u8 stop_report_cnt;
struct rtl8192_tx_ring *ring = &rtlpci->tx_ring[hw_queue];
{
- u16 point_diff = 0;
u16 cur_tx_rp, cur_tx_wp;
u32 tmpu32 = 0;
@@ -1062,18 +1029,12 @@ bool rtl92ee_is_tx_desc_closed(struct ieee80211_hw *hw, u8 hw_queue, u16 index)
cur_tx_rp = (u16)((tmpu32 >> 16) & 0x0fff);
cur_tx_wp = (u16)(tmpu32 & 0x0fff);
- ring->cur_tx_wp = cur_tx_wp;
+ /* don't need to update ring->cur_tx_wp */
ring->cur_tx_rp = cur_tx_rp;
- point_diff = ((cur_tx_rp > cur_tx_wp) ?
- (cur_tx_rp - cur_tx_wp) :
- (TX_DESC_NUM_92E - cur_tx_wp + cur_tx_rp));
-
- ring->avl_desc = point_diff;
}
read_point = ring->cur_tx_rp;
write_point = ring->cur_tx_wp;
- available_desc_num = ring->avl_desc;
if (write_point > read_point) {
if (index < write_point && index >= read_point)
--
2.14.1
On 11/13/2017 03:39 AM, [email protected] wrote:
> From: Ping-Ke Shih <[email protected]>
>
> This patchset is aim to reduce IO to improve TX/RX performance, and also I
> cleanup the code to make it easier and simpler.
>
> Ping-Ke Shih (3):
> rtlwifi: Reduce IO in RX interrupt to boost throughput
> rtlwifi: fix the wrong size to calculate fifo space
> rtlwifi: cleanup the code that check whether TX ring is available
All 3 Tested-by: Larry Finger <[email protected]>
Larry
>
> drivers/net/wireless/realtek/rtlwifi/pci.c | 13 ++---
> drivers/net/wireless/realtek/rtlwifi/pci.h | 5 +-
> .../net/wireless/realtek/rtlwifi/rtl8192ee/trx.c | 57 ++++------------------
> 3 files changed, 15 insertions(+), 60 deletions(-)
>
From: Ping-Ke Shih <[email protected]>
Check remaining count of RX packets cost a lot of CPU time, so only update
when the counter decreases to zero. In old flow, the counter was updated
once a RX packet is received.
Signed-off-by: Steven Ting <[email protected]>
Signed-off-by: Ping-Ke Shih <[email protected]>
---
drivers/net/wireless/realtek/rtlwifi/pci.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.c b/drivers/net/wireless/realtek/rtlwifi/pci.c
index c2575b0b9440..ca3f4716c1b6 100644
--- a/drivers/net/wireless/realtek/rtlwifi/pci.c
+++ b/drivers/net/wireless/realtek/rtlwifi/pci.c
@@ -747,7 +747,7 @@ static void _rtl_pci_rx_interrupt(struct ieee80211_hw *hw)
u8 tmp_one;
bool unicast = false;
u8 hw_queue = 0;
- unsigned int rx_remained_cnt;
+ unsigned int rx_remained_cnt = 0;
struct rtl_stats stats = {
.signal = 0,
.rate = 0,
@@ -768,7 +768,8 @@ static void _rtl_pci_rx_interrupt(struct ieee80211_hw *hw)
struct sk_buff *new_skb;
if (rtlpriv->use_new_trx_flow) {
- rx_remained_cnt =
+ if (rx_remained_cnt == 0)
+ rx_remained_cnt =
rtlpriv->cfg->ops->rx_desc_buff_remained_cnt(hw,
hw_queue);
if (rx_remained_cnt == 0)
--
2.14.1
Ping-Ke Shih <[email protected]> wrote:
> From: Ping-Ke Shih <[email protected]>
>
> Check remaining count of RX packets cost a lot of CPU time, so only update
> when the counter decreases to zero. In old flow, the counter was updated
> once a RX packet is received.
>
> Signed-off-by: Steven Ting <[email protected]>
> Signed-off-by: Ping-Ke Shih <[email protected]>
3 patches applied to wireless-drivers-next.git, thanks.
fb9829e90dcd rtlwifi: Reduce IO in RX interrupt to boost throughput
dc9682a0cca5 rtlwifi: fix the wrong size to calculate fifo space
cf54622c8076 rtlwifi: cleanup the code that check whether TX ring is available
--
https://patchwork.kernel.org/patch/10055429/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches