From 53a01e00f8c78bc5875e09aca7749ea54bb09798 Mon Sep 17 00:00:00 2001 From: "dhananjay@netxen.com" Date: Wed, 26 Dec 2007 10:23:58 -0800 Subject: netxen: optimize tx handling netxen driver allows limited number of threads simultaneously posting skb's in tx ring. If transmit slot is unavailable, driver calls schedule() or loops in xmit_frame(). This patch returns TX_BUSY and lets the stack reschedule the packet if transmit slot is unavailable. Also removes unnecessary check for tx timeout in the driver itself, the network stack does that anyway. Signed-off-by: Dhananjay Phadke Signed-off-by: Jeff Garzik --- drivers/net/netxen/netxen_nic_init.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) (limited to 'drivers/net/netxen/netxen_nic_init.c') diff --git a/drivers/net/netxen/netxen_nic_init.c b/drivers/net/netxen/netxen_nic_init.c index 37589265297e..5f85ad686c98 100644 --- a/drivers/net/netxen/netxen_nic_init.c +++ b/drivers/net/netxen/netxen_nic_init.c @@ -1248,7 +1248,6 @@ int netxen_process_cmd_ring(unsigned long data) struct pci_dev *pdev; struct netxen_skb_frag *frag; u32 i; - struct sk_buff *skb = NULL; int done; spin_lock(&adapter->tx_lock); @@ -1278,9 +1277,8 @@ int netxen_process_cmd_ring(unsigned long data) while ((last_consumer != consumer) && (count1 < MAX_STATUS_HANDLE)) { buffer = &adapter->cmd_buf_arr[last_consumer]; pdev = adapter->pdev; - frag = &buffer->frag_array[0]; - skb = buffer->skb; - if (skb && (cmpxchg(&buffer->skb, skb, 0) == skb)) { + if (buffer->skb) { + frag = &buffer->frag_array[0]; pci_unmap_single(pdev, frag->dma, frag->length, PCI_DMA_TODEVICE); frag->dma = 0ULL; @@ -1293,8 +1291,8 @@ int netxen_process_cmd_ring(unsigned long data) } adapter->stats.skbfreed++; - dev_kfree_skb_any(skb); - skb = NULL; + dev_kfree_skb_any(buffer->skb); + buffer->skb = NULL; } else if (adapter->proc_cmd_buf_counter == 1) { adapter->stats.txnullskb++; } -- cgit v1.2.3 From 5dc162682d4901025a02b7045f3112d569b4bab9 Mon Sep 17 00:00:00 2001 From: Dhananjay Phadke Date: Mon, 31 Dec 2007 10:08:57 -0800 Subject: netxen: fix byte-swapping in tx and rx Here's the reworked patch. This cleans up some unnecessary byte-swapping while setting up tx and interpreting rx desc. The 64 bit rx status data should be converted to host endian format only once and the macros just need to extract bitfields. This saves a spate of interrupts on pseries blades caused by buggy (non) processing rx status ring. Signed-off-by: Dhananjay Phadke Signed-off-by: Jeff Garzik --- drivers/net/netxen/netxen_nic_init.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'drivers/net/netxen/netxen_nic_init.c') diff --git a/drivers/net/netxen/netxen_nic_init.c b/drivers/net/netxen/netxen_nic_init.c index 5f85ad686c98..485ff9398910 100644 --- a/drivers/net/netxen/netxen_nic_init.c +++ b/drivers/net/netxen/netxen_nic_init.c @@ -1070,16 +1070,17 @@ netxen_process_rcv(struct netxen_adapter *adapter, int ctxid, { struct pci_dev *pdev = adapter->pdev; struct net_device *netdev = adapter->netdev; - int index = netxen_get_sts_refhandle(desc); + u64 sts_data = le64_to_cpu(desc->status_desc_data); + int index = netxen_get_sts_refhandle(sts_data); struct netxen_recv_context *recv_ctx = &(adapter->recv_ctx[ctxid]); struct netxen_rx_buffer *buffer; struct sk_buff *skb; - u32 length = netxen_get_sts_totallength(desc); + u32 length = netxen_get_sts_totallength(sts_data); u32 desc_ctx; struct netxen_rcv_desc_ctx *rcv_desc; int ret; - desc_ctx = netxen_get_sts_type(desc); + desc_ctx = netxen_get_sts_type(sts_data); if (unlikely(desc_ctx >= NUM_RCV_DESC_RINGS)) { printk("%s: %s Bad Rcv descriptor ring\n", netxen_nic_driver_name, netdev->name); @@ -1119,7 +1120,7 @@ netxen_process_rcv(struct netxen_adapter *adapter, int ctxid, skb = (struct sk_buff *)buffer->skb; if (likely(adapter->rx_csum && - netxen_get_sts_status(desc) == STATUS_CKSUM_OK)) { + netxen_get_sts_status(sts_data) == STATUS_CKSUM_OK)) { adapter->stats.csummed++; skb->ip_summed = CHECKSUM_UNNECESSARY; } else @@ -1209,7 +1210,6 @@ u32 netxen_process_rcv_ring(struct netxen_adapter *adapter, int ctxid, int max) break; } netxen_process_rcv(adapter, ctxid, desc); - netxen_clear_sts_owner(desc); netxen_set_sts_owner(desc, STATUS_OWNER_PHANTOM); consumer = (consumer + 1) & (adapter->max_rx_desc_count - 1); count++; -- cgit v1.2.3