This patch simplifies netxen ISR and poll() routine. Interrupts are not unmasked in interrupt routine based on a racy has_work() checks, but left to the poll function to enable them. Signed-off-by: Dhananjay Phadke Index: netdev-2.6/drivers/net/netxen/netxen_nic_main.c =================================================================== --- netdev-2.6.orig/drivers/net/netxen/netxen_nic_main.c +++ netdev-2.6/drivers/net/netxen/netxen_nic_main.c @@ -63,7 +63,6 @@ static int netxen_nic_xmit_frame(struct static void netxen_tx_timeout(struct net_device *netdev); static void netxen_tx_timeout_task(struct work_struct *work); static void netxen_watchdog(unsigned long); -static int netxen_handle_int(struct netxen_adapter *, struct net_device *); static int netxen_nic_poll(struct napi_struct *napi, int budget); #ifdef CONFIG_NET_POLL_CONTROLLER static void netxen_nic_poll_controller(struct net_device *netdev); @@ -1218,40 +1217,6 @@ static void netxen_tx_timeout_task(struc netif_wake_queue(adapter->netdev); } -static int -netxen_handle_int(struct netxen_adapter *adapter, struct net_device *netdev) -{ - u32 ret = 0; - - DPRINTK(INFO, "Entered handle ISR\n"); - adapter->stats.ints++; - - netxen_nic_disable_int(adapter); - - if (netxen_nic_rx_has_work(adapter) || netxen_nic_tx_has_work(adapter)) { - if (netif_rx_schedule_prep(netdev, &adapter->napi)) { - /* - * Interrupts are already disabled. - */ - __netif_rx_schedule(netdev, &adapter->napi); - } else { - static unsigned int intcount = 0; - if ((++intcount & 0xfff) == 0xfff) - DPRINTK(KERN_ERR - "%s: %s interrupt %d while in poll\n", - netxen_nic_driver_name, netdev->name, - intcount); - } - ret = 1; - } - - if (ret == 0) { - netxen_nic_enable_int(adapter); - } - - return ret; -} - /* * netxen_intr - Interrupt Handler * @irq: interrupt number @@ -1278,8 +1243,12 @@ irqreturn_t netxen_intr(int irq, void *d } } - if (netif_running(netdev)) - netxen_handle_int(adapter, netdev); + adapter->stats.ints++; + + if (netif_rx_schedule_prep(netdev, &adapter->napi)) { + netxen_nic_disable_int(adapter); + __netif_rx_schedule(netdev, &adapter->napi); + } return IRQ_HANDLED; } @@ -1287,12 +1256,11 @@ irqreturn_t netxen_intr(int irq, void *d static int netxen_nic_poll(struct napi_struct *napi, int budget) { struct netxen_adapter *adapter = container_of(napi, struct netxen_adapter, napi); - struct net_device *netdev = adapter->netdev; - int done = 1; + int tx_complete; int ctx; int work_done; - DPRINTK(INFO, "polling for %d descriptors\n", *budget); + tx_complete = netxen_process_cmd_ring(adapter); work_done = 0; for (ctx = 0; ctx < MAX_RCV_CTX; ++ctx) { @@ -1312,16 +1280,8 @@ static int netxen_nic_poll(struct napi_s budget / MAX_RCV_CTX); } - if (work_done >= budget && netxen_nic_rx_has_work(adapter) != 0) - done = 0; - - if (netxen_process_cmd_ring((unsigned long)adapter) == 0) - done = 0; - - DPRINTK(INFO, "new work_done: %d work_to_do: %d\n", - work_done, work_to_do); - if (done) { - netif_rx_complete(netdev, napi); + if ((work_done < budget) && tx_complete) { + netif_rx_complete(adapter->netdev, &adapter->napi); netxen_nic_enable_int(adapter); } Index: netdev-2.6/drivers/net/netxen/netxen_nic.h =================================================================== --- netdev-2.6.orig/drivers/net/netxen/netxen_nic.h +++ netdev-2.6/drivers/net/netxen/netxen_nic.h @@ -839,7 +839,6 @@ struct netxen_rcv_desc_ctx { u32 flags; u32 producer; u32 rcv_pending; /* Num of bufs posted in phantom */ - u32 rcv_free; /* Num of bufs in free list */ dma_addr_t phys_addr; struct pci_dev *phys_pdev; struct rcv_desc *desc_head; /* address of rx ring in Phantom */ @@ -1073,12 +1072,10 @@ void netxen_tso_check(struct netxen_adap struct cmd_desc_type0 *desc, struct sk_buff *skb); int netxen_nic_hw_resources(struct netxen_adapter *adapter); void netxen_nic_clear_stats(struct netxen_adapter *adapter); -int netxen_nic_rx_has_work(struct netxen_adapter *adapter); -int netxen_nic_tx_has_work(struct netxen_adapter *adapter); void netxen_watchdog_task(struct work_struct *work); void netxen_post_rx_buffers(struct netxen_adapter *adapter, u32 ctx, u32 ringid); -int netxen_process_cmd_ring(unsigned long data); +int netxen_process_cmd_ring(struct netxen_adapter *adapter); u32 netxen_process_rcv_ring(struct netxen_adapter *adapter, int ctx, int max); void netxen_nic_set_multi(struct net_device *netdev); int netxen_nic_change_mtu(struct net_device *netdev, int new_mtu); Index: netdev-2.6/drivers/net/netxen/netxen_nic_init.c =================================================================== --- netdev-2.6.orig/drivers/net/netxen/netxen_nic_init.c +++ netdev-2.6/drivers/net/netxen/netxen_nic_init.c @@ -185,7 +185,6 @@ void netxen_initialize_adapter_sw(struct for (ring = 0; ring < NUM_RCV_DESC_RINGS; ring++) { struct netxen_rx_buffer *rx_buf; rcv_desc = &adapter->recv_ctx[ctxid].rcv_desc[ring]; - rcv_desc->rcv_free = rcv_desc->max_rx_desc_count; rcv_desc->begin_alloc = 0; rx_buf = rcv_desc->rx_buf_arr; num_rx_bufs = rcv_desc->max_rx_desc_count; @@ -975,28 +974,6 @@ int netxen_phantom_init(struct netxen_ad return 0; } -int netxen_nic_rx_has_work(struct netxen_adapter *adapter) -{ - int ctx; - - for (ctx = 0; ctx < MAX_RCV_CTX; ++ctx) { - struct netxen_recv_context *recv_ctx = - &(adapter->recv_ctx[ctx]); - u32 consumer; - struct status_desc *desc_head; - struct status_desc *desc; - - consumer = recv_ctx->status_rx_consumer; - desc_head = recv_ctx->rcv_status_desc_head; - desc = &desc_head[consumer]; - - if (netxen_get_sts_owner(desc) & STATUS_OWNER_HOST) - return 1; - } - - return 0; -} - static int netxen_nic_check_temp(struct netxen_adapter *adapter) { struct net_device *netdev = adapter->netdev; @@ -1175,7 +1152,6 @@ static void netxen_process_rcv(struct ne netdev->last_rx = jiffies; - rcv_desc->rcv_free++; rcv_desc->rcv_pending--; /* @@ -1231,23 +1207,22 @@ u32 netxen_process_rcv_ring(struct netxe recv_ctx->status_rx_consumer = consumer; recv_ctx->status_rx_producer = producer; + smp_wmb(); /* Window = 1 */ writel(consumer, NETXEN_CRB_NORMALIZE(adapter, recv_crb_registers[adapter->portnum]. crb_rcv_status_consumer)); - wmb(); } return count; } /* Process Command status ring */ -int netxen_process_cmd_ring(unsigned long data) +int netxen_process_cmd_ring(struct netxen_adapter *adapter) { u32 last_consumer; u32 consumer; - struct netxen_adapter *adapter = (struct netxen_adapter *)data; int count1 = 0; int count2 = 0; struct netxen_cmd_buffer *buffer; @@ -1353,11 +1328,7 @@ int netxen_process_cmd_ring(unsigned lon * There is still a possible race condition and the host could miss an * interrupt. The card has to take care of this. */ - if (adapter->last_cmd_consumer == consumer && - (((adapter->cmd_producer + 1) % - adapter->max_tx_desc_count) == adapter->last_cmd_consumer)) { - consumer = le32_to_cpu(*(adapter->cmd_consumer)); - } + consumer = le32_to_cpu(*(adapter->cmd_consumer)); done = (adapter->last_cmd_consumer == consumer); spin_unlock(&adapter->tx_lock); @@ -1436,8 +1407,6 @@ void netxen_post_rx_buffers(struct netxe rcv_desc->begin_alloc = index; rcv_desc->rcv_pending += count; rcv_desc->producer = producer; - if (rcv_desc->rcv_free >= 32) { - rcv_desc->rcv_free = 0; /* Window = 1 */ writel((producer - 1) & (rcv_desc->max_rx_desc_count - 1), @@ -1461,8 +1430,6 @@ void netxen_post_rx_buffers(struct netxe writel(msg, DB_NORMALIZE(adapter, NETXEN_RCV_PRODUCER_OFFSET)); - wmb(); - } } } @@ -1526,8 +1493,6 @@ static void netxen_post_rx_buffers_nodb( rcv_desc->begin_alloc = index; rcv_desc->rcv_pending += count; rcv_desc->producer = producer; - if (rcv_desc->rcv_free >= 32) { - rcv_desc->rcv_free = 0; /* Window = 1 */ writel((producer - 1) & (rcv_desc->max_rx_desc_count - 1), @@ -1537,21 +1502,9 @@ static void netxen_post_rx_buffers_nodb( rcv_desc_crb[ringid]. crb_rcv_producer_offset)); wmb(); - } } } -int netxen_nic_tx_has_work(struct netxen_adapter *adapter) -{ - if (find_diff_among(adapter->last_cmd_consumer, - adapter->cmd_producer, - adapter->max_tx_desc_count) > 0) - return 1; - - return 0; -} - - void netxen_nic_clear_stats(struct netxen_adapter *adapter) { memset(&adapter->stats, 0, sizeof(adapter->stats)); -- -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html