From: Steven Ting <[email protected]> After this refactoring, the variables wp and rp in TX ring can only be updated in OP_TX and TX_OK respectively without protection. The other changes are listed below:
1. remove avl_desc from TX ring, because it can be calculated by wp and rp. Moreover, we update this variable in op_tx (thread context) and TX_OK (BH context) without protection. 2. extend calc_fifo_space(rp, wp) to calc_fifo_space(rp, wp, size), and fix the caller's parameter 'size'. 3. Get RX remaining counter only if it count down to zero. 4. remove available_desc check from Tx ISR Signed-off-by: Steven Ting <[email protected]> Signed-off-by: Ping-Ke Shih <[email protected]> Signed-off-by: Larry Finger <[email protected]> Cc: Yan-Hsuan Chuang <[email protected]> Cc: Birming Chiu <[email protected]> Cc: Shaofu <[email protected]> --- 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(-) diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.c b/drivers/net/wireless/realtek/rtlwifi/pci.c index c2575b0b9440..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; @@ -747,7 +740,7 @@ 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 +761,8 @@ 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) @@ -1250,7 +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 e7d070e8da2d..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 */ }; @@ -320,10 +319,10 @@ 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..4f7444331b07 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; @@ -548,7 +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; @@ -560,9 +560,9 @@ 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; } @@ -907,10 +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; @@ -931,38 +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; } @@ -1044,13 +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; @@ -1060,18 +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) -- 2.14.3
