From d32cc3d24eace8a271a39ffe8aeae1861f400d2d Mon Sep 17 00:00:00 2001 From: Dhananjay Phadke Date: Mon, 9 Mar 2009 08:50:53 +0000 Subject: [PATCH] netxen: small xmit optimizations Signed-off-by: Dhananjay Phadke Signed-off-by: David S. Miller --- drivers/net/netxen/netxen_nic.h | 5 +---- drivers/net/netxen/netxen_nic_init.c | 2 ++ drivers/net/netxen/netxen_nic_main.c | 22 ++++++++++++++-------- 3 files changed, 17 insertions(+), 12 deletions(-) diff --git a/drivers/net/netxen/netxen_nic.h b/drivers/net/netxen/netxen_nic.h index 73cb1164457f..b5c0d66daf7e 100644 --- a/drivers/net/netxen/netxen_nic.h +++ b/drivers/net/netxen/netxen_nic.h @@ -358,10 +358,7 @@ struct cmd_desc_type0 { __le64 addr_buffer1; }; - __le16 buffer1_length; - __le16 buffer2_length; - __le16 buffer3_length; - __le16 buffer4_length; + __le16 buffer_length[4]; union { struct { diff --git a/drivers/net/netxen/netxen_nic_init.c b/drivers/net/netxen/netxen_nic_init.c index f8164345e3b3..72aba634554a 100644 --- a/drivers/net/netxen/netxen_nic_init.c +++ b/drivers/net/netxen/netxen_nic_init.c @@ -955,6 +955,7 @@ int netxen_process_cmd_ring(struct netxen_adapter *adapter) int done = 0; last_consumer = adapter->last_cmd_consumer; + barrier(); /* cmd_consumer can change underneath */ consumer = le32_to_cpu(*(adapter->cmd_consumer)); while (last_consumer != consumer) { @@ -1005,6 +1006,7 @@ int netxen_process_cmd_ring(struct netxen_adapter *adapter) * There is still a possible race condition and the host could miss an * interrupt. The card has to take care of this. */ + barrier(); /* cmd_consumer can change underneath */ consumer = le32_to_cpu(*(adapter->cmd_consumer)); done = (last_consumer == consumer); diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c index dfd66eaed1aa..c9519843f8cb 100644 --- a/drivers/net/netxen/netxen_nic_main.c +++ b/drivers/net/netxen/netxen_nic_main.c @@ -1212,7 +1212,16 @@ netxen_clean_tx_dma_mapping(struct pci_dev *pdev, } } -static int netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev) +static inline void +netxen_clear_cmddesc(u64 *desc) +{ + int i; + for (i = 0; i < 8; i++) + desc[i] = 0ULL; +} + +static int +netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev) { struct netxen_adapter *adapter = netdev_priv(netdev); struct netxen_hardware_context *hw = &adapter->ahw; @@ -1245,7 +1254,7 @@ static int netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev) /* Copy the descriptors into the hardware */ hwdesc = &hw->cmd_desc_head[producer]; - memset(hwdesc, 0, sizeof(struct cmd_desc_type0)); + netxen_clear_cmddesc((u64 *)hwdesc); /* Take skb->data itself */ pbuf = &adapter->cmd_buf_arr[producer]; @@ -1264,7 +1273,7 @@ static int netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev) netxen_set_tx_frags_len(hwdesc, frag_count, skb->len); netxen_set_tx_port(hwdesc, adapter->portnum); - hwdesc->buffer1_length = cpu_to_le16(first_seg_len); + hwdesc->buffer_length[0] = cpu_to_le16(first_seg_len); hwdesc->addr_buffer1 = cpu_to_le64(buffrag->dma); for (i = 1, k = 1; i < frag_count; i++, k++) { @@ -1277,7 +1286,7 @@ static int netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev) k = 0; producer = get_next_index(producer, num_txd); hwdesc = &hw->cmd_desc_head[producer]; - memset(hwdesc, 0, sizeof(struct cmd_desc_type0)); + netxen_clear_cmddesc((u64 *)hwdesc); pbuf = &adapter->cmd_buf_arr[producer]; pbuf->skb = NULL; } @@ -1297,21 +1306,18 @@ static int netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev) buffrag->dma = temp_dma; buffrag->length = temp_len; + hwdesc->buffer_length[k] = cpu_to_le16(temp_len); switch (k) { case 0: - hwdesc->buffer1_length = cpu_to_le16(temp_len); hwdesc->addr_buffer1 = cpu_to_le64(temp_dma); break; case 1: - hwdesc->buffer2_length = cpu_to_le16(temp_len); hwdesc->addr_buffer2 = cpu_to_le64(temp_dma); break; case 2: - hwdesc->buffer3_length = cpu_to_le16(temp_len); hwdesc->addr_buffer3 = cpu_to_le64(temp_dma); break; case 3: - hwdesc->buffer4_length = cpu_to_le16(temp_len); hwdesc->addr_buffer4 = cpu_to_le64(temp_dma); break; } -- 2.20.1