From fce99e341524c204ef3dd3e7c5f77265a7e05ddd Mon Sep 17 00:00:00 2001 From: Alexander Duyck Date: Tue, 27 Oct 2009 15:51:27 +0000 Subject: [PATCH] igb: change the head and tail offsets into pointers Since we are writting to the head/tail pointers frequently we might as well save ourselves some processing time by converting the head and tail offsets directly to pointers. This will shave a few cycles off the rx/tx path and allows us to move one step closer to the rings being a bit more independant of each other. Signed-off-by: Alexander Duyck Signed-off-by: Jeff Kirsher Signed-off-by: David S. Miller --- drivers/net/igb/igb.h | 4 ++-- drivers/net/igb/igb_main.c | 32 ++++++++++++++++---------------- 2 files changed, 18 insertions(+), 18 deletions(-) diff --git a/drivers/net/igb/igb.h b/drivers/net/igb/igb.h index 303df02a6907..e52fee44aeac 100644 --- a/drivers/net/igb/igb.h +++ b/drivers/net/igb/igb.h @@ -178,8 +178,8 @@ struct igb_ring { unsigned int count; /* number of desc. in the ring */ u16 next_to_use; u16 next_to_clean; - u16 head; - u16 tail; + void __iomem *head; + void __iomem *tail; struct igb_buffer *buffer_info; /* array of buffer info structs */ u8 queue_index; diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c index dfca8217c5ea..2728f9316027 100644 --- a/drivers/net/igb/igb_main.c +++ b/drivers/net/igb/igb_main.c @@ -2124,10 +2124,10 @@ static void igb_configure_tx_ring(struct igb_adapter *adapter, tdba & 0x00000000ffffffffULL); wr32(E1000_TDBAH(reg_idx), tdba >> 32); - ring->head = E1000_TDH(reg_idx); - ring->tail = E1000_TDT(reg_idx); - writel(0, hw->hw_addr + ring->tail); - writel(0, hw->hw_addr + ring->head); + ring->head = hw->hw_addr + E1000_TDH(reg_idx); + ring->tail = hw->hw_addr + E1000_TDT(reg_idx); + writel(0, ring->head); + writel(0, ring->tail); txdctl |= IGB_TX_PTHRESH; txdctl |= IGB_TX_HTHRESH << 8; @@ -2354,10 +2354,10 @@ static void igb_configure_rx_ring(struct igb_adapter *adapter, ring->count * sizeof(union e1000_adv_rx_desc)); /* initialize head and tail */ - ring->head = E1000_RDH(reg_idx); - ring->tail = E1000_RDT(reg_idx); - writel(0, hw->hw_addr + ring->head); - writel(0, hw->hw_addr + ring->tail); + ring->head = hw->hw_addr + E1000_RDH(reg_idx); + ring->tail = hw->hw_addr + E1000_RDT(reg_idx); + writel(0, ring->head); + writel(0, ring->tail); /* set descriptor configuration */ if (adapter->rx_buffer_len < IGB_RXBUFFER_1024) { @@ -2567,8 +2567,8 @@ static void igb_clean_tx_ring(struct igb_ring *tx_ring) tx_ring->next_to_use = 0; tx_ring->next_to_clean = 0; - writel(0, adapter->hw.hw_addr + tx_ring->head); - writel(0, adapter->hw.hw_addr + tx_ring->tail); + writel(0, tx_ring->head); + writel(0, tx_ring->tail); } /** @@ -2667,8 +2667,8 @@ static void igb_clean_rx_ring(struct igb_ring *rx_ring) rx_ring->next_to_clean = 0; rx_ring->next_to_use = 0; - writel(0, adapter->hw.hw_addr + rx_ring->head); - writel(0, adapter->hw.hw_addr + rx_ring->tail); + writel(0, rx_ring->head); + writel(0, rx_ring->tail); } /** @@ -3556,7 +3556,7 @@ static inline void igb_tx_queue_adv(struct igb_adapter *adapter, wmb(); tx_ring->next_to_use = i; - writel(i, adapter->hw.hw_addr + tx_ring->tail); + writel(i, tx_ring->tail); /* we need this if more than one processor can write to our tail * at a time, it syncronizes IO on IA64/Altix systems */ mmiowb(); @@ -4761,8 +4761,8 @@ static bool igb_clean_tx_irq(struct igb_q_vector *q_vector) " jiffies <%lx>\n" " desc.status <%x>\n", tx_ring->queue_index, - readl(adapter->hw.hw_addr + tx_ring->head), - readl(adapter->hw.hw_addr + tx_ring->tail), + readl(tx_ring->head), + readl(tx_ring->tail), tx_ring->next_to_use, tx_ring->next_to_clean, tx_ring->buffer_info[i].time_stamp, @@ -5103,7 +5103,7 @@ no_buffers: * applicable for weak-ordered memory model archs, * such as IA-64). */ wmb(); - writel(i, adapter->hw.hw_addr + rx_ring->tail); + writel(i, rx_ring->tail); } } -- 2.20.1