e1000: Remove Multiqueue code until we have support for MSI-X in our hardware

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>

3 files changed, 4 insertions, 292 deletions

diff --git a/drivers/net/e1000/e1000.h b/drivers/net/e1000/e1000.h
index 99baf0e..658f36a 100644
--- a/drivers/net/e1000/e1000.h
+++ b/drivers/net/e1000/e1000.h
@@ -83,10 +83,6 @@
 struct e1000_adapter;
 
 #include "e1000_hw.h"
-#ifdef CONFIG_E1000_MQ
-#include <linux/cpu.h>
-#include <linux/smp.h>
-#endif
 
 #ifdef DBG
 #define E1000_DBG(args...) printk(KERN_DEBUG "e1000: " args)
@@ -169,12 +165,6 @@ struct e1000_buffer {
 	uint16_t next_to_watch;
 };
 
-#ifdef CONFIG_E1000_MQ
-struct e1000_queue_stats {
-	uint64_t packets;
-	uint64_t bytes;
-};
-#endif
 
 struct e1000_ps_page { struct page *ps_page[PS_PAGE_BUFFERS]; };
 struct e1000_ps_page_dma { uint64_t ps_page_dma[PS_PAGE_BUFFERS]; };
@@ -198,12 +188,7 @@ struct e1000_tx_ring {
 	spinlock_t tx_lock;
 	uint16_t tdh;
 	uint16_t tdt;
-
 	boolean_t last_tx_tso;
-
-#ifdef CONFIG_E1000_MQ
-	struct e1000_queue_stats tx_stats;
-#endif
 };
 
 struct e1000_rx_ring {
@@ -230,9 +215,6 @@ struct e1000_rx_ring {
 
 	uint16_t rdh;
 	uint16_t rdt;
-#ifdef CONFIG_E1000_MQ
-	struct e1000_queue_stats rx_stats;
-#endif
 };
 
 #define E1000_DESC_UNUSED(R) \
@@ -278,9 +260,6 @@ struct e1000_adapter {
 
 	/* TX */
 	struct e1000_tx_ring *tx_ring;      /* One per active queue */
-#ifdef CONFIG_E1000_MQ
-	struct e1000_tx_ring **cpu_tx_ring; /* per-cpu */
-#endif
 	unsigned long tx_queue_len;
 	uint32_t txd_cmd;
 	uint32_t tx_int_delay;
@@ -314,11 +293,6 @@ struct e1000_adapter {
 #ifdef CONFIG_E1000_NAPI
 	struct net_device *polling_netdev;  /* One per active queue */
 #endif
-#ifdef CONFIG_E1000_MQ
-	struct net_device **cpu_netdev;     /* per-cpu */
-	struct call_async_data_struct rx_sched_call_data;
-	cpumask_t cpumask;
-#endif
 	int num_tx_queues;
 	int num_rx_queues;
 
diff --git a/drivers/net/e1000/e1000_ethtool.c b/drivers/net/e1000/e1000_ethtool.c
index 5cedc81..c7b4791 100644
--- a/drivers/net/e1000/e1000_ethtool.c
+++ b/drivers/net/e1000/e1000_ethtool.c
@@ -97,14 +97,7 @@ static const struct e1000_stats e1000_gstrings_stats[] = {
 	{ "alloc_rx_buff_failed", E1000_STAT(alloc_rx_buff_failed) },
 };
 
-#ifdef CONFIG_E1000_MQ
-#define E1000_QUEUE_STATS_LEN \
-	(((struct e1000_adapter *)netdev->priv)->num_tx_queues + \
-	 ((struct e1000_adapter *)netdev->priv)->num_rx_queues) \
-	* (sizeof(struct e1000_queue_stats) / sizeof(uint64_t))
-#else
 #define E1000_QUEUE_STATS_LEN 0
-#endif
 #define E1000_GLOBAL_STATS_LEN	\
 	sizeof(e1000_gstrings_stats) / sizeof(struct e1000_stats)
 #define E1000_STATS_LEN (E1000_GLOBAL_STATS_LEN + E1000_QUEUE_STATS_LEN)
@@ -1799,11 +1792,6 @@ e1000_get_ethtool_stats(struct net_device *netdev,
 		struct ethtool_stats *stats, uint64_t *data)
 {
 	struct e1000_adapter *adapter = netdev_priv(netdev);
-#ifdef CONFIG_E1000_MQ
-	uint64_t *queue_stat;
-	int stat_count = sizeof(struct e1000_queue_stats) / sizeof(uint64_t);
-	int j, k;
-#endif
 	int i;
 
 	e1000_update_stats(adapter);
@@ -1812,29 +1800,12 @@ e1000_get_ethtool_stats(struct net_device *netdev,
 		data[i] = (e1000_gstrings_stats[i].sizeof_stat ==
 			sizeof(uint64_t)) ? *(uint64_t *)p : *(uint32_t *)p;
 	}
-#ifdef CONFIG_E1000_MQ
-	for (j = 0; j < adapter->num_tx_queues; j++) {
-		queue_stat = (uint64_t *)&adapter->tx_ring[j].tx_stats;
-		for (k = 0; k < stat_count; k++)
-			data[i + k] = queue_stat[k];
-		i += k;
-	}
-	for (j = 0; j < adapter->num_rx_queues; j++) {
-		queue_stat = (uint64_t *)&adapter->rx_ring[j].rx_stats;
-		for (k = 0; k < stat_count; k++)
-			data[i + k] = queue_stat[k];
-		i += k;
-	}
-#endif
 /*	BUG_ON(i != E1000_STATS_LEN); */
 }
 
 static void
 e1000_get_strings(struct net_device *netdev, uint32_t stringset, uint8_t *data)
 {
-#ifdef CONFIG_E1000_MQ
-	struct e1000_adapter *adapter = netdev_priv(netdev);
-#endif
 	uint8_t *p = data;
 	int i;
 
@@ -1849,20 +1820,6 @@ e1000_get_strings(struct net_device *netdev, uint32_t stringset, uint8_t *data)
 			       ETH_GSTRING_LEN);
 			p += ETH_GSTRING_LEN;
 		}
-#ifdef CONFIG_E1000_MQ
-		for (i = 0; i < adapter->num_tx_queues; i++) {
-			sprintf(p, "tx_queue_%u_packets", i);
-			p += ETH_GSTRING_LEN;
-			sprintf(p, "tx_queue_%u_bytes", i);
-			p += ETH_GSTRING_LEN;
-		}
-		for (i = 0; i < adapter->num_rx_queues; i++) {
-			sprintf(p, "rx_queue_%u_packets", i);
-			p += ETH_GSTRING_LEN;
-			sprintf(p, "rx_queue_%u_bytes", i);
-			p += ETH_GSTRING_LEN;
-		}
-#endif
 /*		BUG_ON(p - data != E1000_STATS_LEN * ETH_GSTRING_LEN); */
 		break;
 	}
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 5b7d0f4..af87eb0 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -103,7 +103,7 @@ static char e1000_driver_string[] = "Intel(R) PRO/1000 Network Driver";
 #else
 #define DRIVERNAPI "-NAPI"
 #endif
-#define DRV_VERSION "6.3.9-k4"DRIVERNAPI
+#define DRV_VERSION "7.0.33-k2"DRIVERNAPI
 char e1000_driver_version[] = DRV_VERSION;
 static char e1000_copyright[] = "Copyright (c) 1999-2005 Intel Corporation.";
 
@@ -191,9 +191,6 @@ static void e1000_exit_module(void);
 static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
 static void __devexit e1000_remove(struct pci_dev *pdev);
 static int e1000_alloc_queues(struct e1000_adapter *adapter);
-#ifdef CONFIG_E1000_MQ
-static void e1000_setup_queue_mapping(struct e1000_adapter *adapter);
-#endif
 static int e1000_sw_init(struct e1000_adapter *adapter);
 static int e1000_open(struct net_device *netdev);
 static int e1000_close(struct net_device *netdev);
@@ -265,10 +262,6 @@ static int e1000_resume(struct pci_dev *pdev);
 static void e1000_netpoll (struct net_device *netdev);
 #endif
 
-#ifdef CONFIG_E1000_MQ
-/* for multiple Rx queues */
-void e1000_rx_schedule(void *data);
-#endif
 
 /* Exported from other modules */
 
@@ -502,10 +495,6 @@ e1000_up(struct e1000_adapter *adapter)
 		return err;
 	}
 
-#ifdef CONFIG_E1000_MQ
-	e1000_setup_queue_mapping(adapter);
-#endif
-
 	adapter->tx_queue_len = netdev->tx_queue_len;
 
 	mod_timer(&adapter->watchdog_timer, jiffies);
@@ -526,9 +515,7 @@ e1000_down(struct e1000_adapter *adapter)
 				     e1000_check_mng_mode(&adapter->hw);
 
 	e1000_irq_disable(adapter);
-#ifdef CONFIG_E1000_MQ
-	while (atomic_read(&adapter->rx_sched_call_data.count) != 0);
-#endif
+
 	free_irq(adapter->pdev->irq, netdev);
 #ifdef CONFIG_PCI_MSI
 	if (adapter->hw.mac_type > e1000_82547_rev_2 &&
@@ -972,10 +959,6 @@ e1000_remove(struct pci_dev *pdev)
 	iounmap(adapter->hw.hw_addr);
 	pci_release_regions(pdev);
 
-#ifdef CONFIG_E1000_MQ
-	free_percpu(adapter->cpu_netdev);
-	free_percpu(adapter->cpu_tx_ring);
-#endif
 	free_netdev(netdev);
 
 	pci_disable_device(pdev);
@@ -1056,40 +1039,8 @@ e1000_sw_init(struct e1000_adapter *adapter)
 		hw->master_slave = E1000_MASTER_SLAVE;
 	}
 
-#ifdef CONFIG_E1000_MQ
-	/* Number of supported queues */
-	switch (hw->mac_type) {
-	case e1000_82571:
-	case e1000_82572:
-		/* These controllers support 2 tx queues, but with a single
-		 * qdisc implementation, multiple tx queues aren't quite as
-		 * interesting.  If we can find a logical way of mapping
-		 * flows to a queue, then perhaps we can up the num_tx_queue
-		 * count back to its default.  Until then, we run the risk of
-		 * terrible performance due to SACK overload. */
-		adapter->num_tx_queues = 1;
-		adapter->num_rx_queues = 2;
-		break;
-	default:
-		adapter->num_tx_queues = 1;
-		adapter->num_rx_queues = 1;
-		break;
-	}
-	adapter->num_rx_queues = min(adapter->num_rx_queues, num_online_cpus());
-	adapter->num_tx_queues = min(adapter->num_tx_queues, num_online_cpus());
-	DPRINTK(DRV, INFO, "Multiqueue Enabled: Rx Queue count = %u %s\n",
-		adapter->num_rx_queues,
-		((adapter->num_rx_queues == 1)
-		 ? ((num_online_cpus() > 1)
-			? "(due to unsupported feature in current adapter)"
-			: "(due to unsupported system configuration)")
-		 : ""));
-	DPRINTK(DRV, INFO, "Multiqueue Enabled: Tx Queue count = %u\n",
-		adapter->num_tx_queues);
-#else
 	adapter->num_tx_queues = 1;
 	adapter->num_rx_queues = 1;
-#endif
 
 	if (e1000_alloc_queues(adapter)) {
 		DPRINTK(PROBE, ERR, "Unable to allocate memory for queues\n");
@@ -1152,51 +1103,9 @@ e1000_alloc_queues(struct e1000_adapter *adapter)
 	memset(adapter->polling_netdev, 0, size);
 #endif
 
-#ifdef CONFIG_E1000_MQ
-	adapter->rx_sched_call_data.func = e1000_rx_schedule;
-	adapter->rx_sched_call_data.info = adapter->netdev;
-
-	adapter->cpu_netdev = alloc_percpu(struct net_device *);
-	adapter->cpu_tx_ring = alloc_percpu(struct e1000_tx_ring *);
-#endif
-
 	return E1000_SUCCESS;
 }
 
-#ifdef CONFIG_E1000_MQ
-static void __devinit
-e1000_setup_queue_mapping(struct e1000_adapter *adapter)
-{
-	int i, cpu;
-
-	adapter->rx_sched_call_data.func = e1000_rx_schedule;
-	adapter->rx_sched_call_data.info = adapter->netdev;
-	cpus_clear(adapter->rx_sched_call_data.cpumask);
-
-	adapter->cpu_netdev = alloc_percpu(struct net_device *);
-	adapter->cpu_tx_ring = alloc_percpu(struct e1000_tx_ring *);
-
-	lock_cpu_hotplug();
-	i = 0;
-	for_each_online_cpu(cpu) {
-		*per_cpu_ptr(adapter->cpu_tx_ring, cpu) = &adapter->tx_ring[i % adapter->num_tx_queues];
-		/* This is incomplete because we'd like to assign separate
-		 * physical cpus to these netdev polling structures and
-		 * avoid saturating a subset of cpus.
-		 */
-		if (i < adapter->num_rx_queues) {
-			*per_cpu_ptr(adapter->cpu_netdev, cpu) = &adapter->polling_netdev[i];
-			adapter->rx_ring[i].cpu = cpu;
-			cpu_set(cpu, adapter->cpumask);
-		} else
-			*per_cpu_ptr(adapter->cpu_netdev, cpu) = NULL;
-
-		i++;
-	}
-	unlock_cpu_hotplug();
-}
-#endif
-
 /**
  * e1000_open - Called when a network interface is made active
  * @netdev: network interface device structure
@@ -1435,18 +1344,6 @@ e1000_configure_tx(struct e1000_adapter *adapter)
 	/* Setup the HW Tx Head and Tail descriptor pointers */
 
 	switch (adapter->num_tx_queues) {
-	case 2:
-		tdba = adapter->tx_ring[1].dma;
-		tdlen = adapter->tx_ring[1].count *
-			sizeof(struct e1000_tx_desc);
-		E1000_WRITE_REG(hw, TDBAL1, (tdba & 0x00000000ffffffffULL));
-		E1000_WRITE_REG(hw, TDBAH1, (tdba >> 32));
-		E1000_WRITE_REG(hw, TDLEN1, tdlen);
-		E1000_WRITE_REG(hw, TDH1, 0);
-		E1000_WRITE_REG(hw, TDT1, 0);
-		adapter->tx_ring[1].tdh = E1000_TDH1;
-		adapter->tx_ring[1].tdt = E1000_TDT1;
-		/* Fall Through */
 	case 1:
 	default:
 		tdba = adapter->tx_ring[0].dma;
@@ -1790,10 +1687,6 @@ e1000_configure_rx(struct e1000_adapter *adapter)
 	uint64_t rdba;
 	struct e1000_hw *hw = &adapter->hw;
 	uint32_t rdlen, rctl, rxcsum, ctrl_ext;
-#ifdef CONFIG_E1000_MQ
-	uint32_t reta, mrqc;
-	int i;
-#endif
 
 	if (adapter->rx_ps_pages) {
 		rdlen = adapter->rx_ring[0].count *
@@ -1837,18 +1730,6 @@ e1000_configure_rx(struct e1000_adapter *adapter)
 	/* Setup the HW Rx Head and Tail Descriptor Pointers and
 	 * the Base and Length of the Rx Descriptor Ring */
 	switch (adapter->num_rx_queues) {
-#ifdef CONFIG_E1000_MQ
-	case 2:
-		rdba = adapter->rx_ring[1].dma;
-		E1000_WRITE_REG(hw, RDBAL1, (rdba & 0x00000000ffffffffULL));
-		E1000_WRITE_REG(hw, RDBAH1, (rdba >> 32));
-		E1000_WRITE_REG(hw, RDLEN1, rdlen);
-		E1000_WRITE_REG(hw, RDH1, 0);
-		E1000_WRITE_REG(hw, RDT1, 0);
-		adapter->rx_ring[1].rdh = E1000_RDH1;
-		adapter->rx_ring[1].rdt = E1000_RDT1;
-		/* Fall Through */
-#endif
 	case 1:
 	default:
 		rdba = adapter->rx_ring[0].dma;
@@ -1862,46 +1743,6 @@ e1000_configure_rx(struct e1000_adapter *adapter)
 		break;
 	}
 
-#ifdef CONFIG_E1000_MQ
-	if (adapter->num_rx_queues > 1) {
-		uint32_t random[10];
-
-		get_random_bytes(&random[0], 40);
-
-		if (hw->mac_type <= e1000_82572) {
-			E1000_WRITE_REG(hw, RSSIR, 0);
-			E1000_WRITE_REG(hw, RSSIM, 0);
-		}
-
-		switch (adapter->num_rx_queues) {
-		case 2:
-		default:
-			reta = 0x00800080;
-			mrqc = E1000_MRQC_ENABLE_RSS_2Q;
-			break;
-		}
-
-		/* Fill out redirection table */
-		for (i = 0; i < 32; i++)
-			E1000_WRITE_REG_ARRAY(hw, RETA, i, reta);
-		/* Fill out hash function seeds */
-		for (i = 0; i < 10; i++)
-			E1000_WRITE_REG_ARRAY(hw, RSSRK, i, random[i]);
-
-		mrqc |= (E1000_MRQC_RSS_FIELD_IPV4 |
-			 E1000_MRQC_RSS_FIELD_IPV4_TCP);
-		E1000_WRITE_REG(hw, MRQC, mrqc);
-	}
-
-	/* Multiqueue and packet checksumming are mutually exclusive. */
-	if (hw->mac_type >= e1000_82571) {
-		rxcsum = E1000_READ_REG(hw, RXCSUM);
-		rxcsum |= E1000_RXCSUM_PCSD;
-		E1000_WRITE_REG(hw, RXCSUM, rxcsum);
-	}
-
-#else
-
 	/* Enable 82543 Receive Checksum Offload for TCP and UDP */
 	if (hw->mac_type >= e1000_82543) {
 		rxcsum = E1000_READ_REG(hw, RXCSUM);
@@ -1920,7 +1761,6 @@ e1000_configure_rx(struct e1000_adapter *adapter)
 		}
 		E1000_WRITE_REG(hw, RXCSUM, rxcsum);
 	}
-#endif /* CONFIG_E1000_MQ */
 
 	if (hw->mac_type == e1000_82573)
 		E1000_WRITE_REG(hw, ERT, 0x0100);
@@ -2465,9 +2305,6 @@ e1000_watchdog_task(struct e1000_adapter *adapter)
 
 	e1000_update_adaptive(&adapter->hw);
 
-#ifdef CONFIG_E1000_MQ
-	txdr = *per_cpu_ptr(adapter->cpu_tx_ring, smp_processor_id());
-#endif
 	if (!netif_carrier_ok(netdev)) {
 		if (E1000_DESC_UNUSED(txdr) + 1 < txdr->count) {
 			/* We've lost link, so the controller stops DMA,
@@ -2881,11 +2718,7 @@ e1000_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
 	unsigned int f;
 	len -= skb->data_len;
 
-#ifdef CONFIG_E1000_MQ
-	tx_ring = *per_cpu_ptr(adapter->cpu_tx_ring, smp_processor_id());
-#else
 	tx_ring = adapter->tx_ring;
-#endif
 
 	if (unlikely(skb->len <= 0)) {
 		dev_kfree_skb_any(skb);
@@ -3288,29 +3121,6 @@ e1000_update_stats(struct e1000_adapter *adapter)
 	spin_unlock_irqrestore(&adapter->stats_lock, flags);
 }
 
-#ifdef CONFIG_E1000_MQ
-void
-e1000_rx_schedule(void *data)
-{
-	struct net_device *poll_dev, *netdev = data;
-	struct e1000_adapter *adapter = netdev->priv;
-	int this_cpu = get_cpu();
-
-	poll_dev = *per_cpu_ptr(adapter->cpu_netdev, this_cpu);
-	if (poll_dev == NULL) {
-		put_cpu();
-		return;
-	}
-
-	if (likely(netif_rx_schedule_prep(poll_dev)))
-		__netif_rx_schedule(poll_dev);
-	else
-		e1000_irq_enable(adapter);
-
-	put_cpu();
-}
-#endif
-
 /**
  * e1000_intr - Interrupt Handler
  * @irq: interrupt number
@@ -3355,26 +3165,11 @@ e1000_intr(int irq, void *data, struct pt_regs *regs)
 		E1000_WRITE_REG(hw, IMC, ~0);
 		E1000_WRITE_FLUSH(hw);
 	}
-#ifdef CONFIG_E1000_MQ
-	if (atomic_read(&adapter->rx_sched_call_data.count) == 0) {
-		/* We must setup the cpumask once count == 0 since
-		 * each cpu bit is cleared when the work is done. */
-		adapter->rx_sched_call_data.cpumask = adapter->cpumask;
-		atomic_add(adapter->num_rx_queues - 1, &adapter->irq_sem);
-		atomic_set(&adapter->rx_sched_call_data.count,
-		           adapter->num_rx_queues);
-		smp_call_async_mask(&adapter->rx_sched_call_data);
-	} else {
-		printk("call_data.count == %u\n", atomic_read(&adapter->rx_sched_call_data.count));
-	}
-#else /* if !CONFIG_E1000_MQ */
 	if (likely(netif_rx_schedule_prep(&adapter->polling_netdev[0])))
 		__netif_rx_schedule(&adapter->polling_netdev[0]);
 	else
 		e1000_irq_enable(adapter);
-#endif /* CONFIG_E1000_MQ */
-
-#else /* if !CONFIG_E1000_NAPI */
+#else
 	/* Writing IMC and IMS is needed for 82547.
 	 * Due to Hub Link bus being occupied, an interrupt
 	 * de-assertion message is not able to be sent.
@@ -3398,7 +3193,7 @@ e1000_intr(int irq, void *data, struct pt_regs *regs)
 	if (hw->mac_type == e1000_82547 || hw->mac_type == e1000_82547_rev_2)
 		e1000_irq_enable(adapter);
 
-#endif /* CONFIG_E1000_NAPI */
+#endif
 
 	return IRQ_HANDLED;
 }
@@ -3486,18 +3281,12 @@ e1000_clean_tx_irq(struct e1000_adapter *adapter,
 			buffer_info = &tx_ring->buffer_info[i];
 			cleaned = (i == eop);
 
-#ifdef CONFIG_E1000_MQ
-			tx_ring->tx_stats.bytes += buffer_info->length;
-#endif
 			e1000_unmap_and_free_tx_resource(adapter, buffer_info);
 			memset(tx_desc, 0, sizeof(struct e1000_tx_desc));
 
 			if (unlikely(++i == tx_ring->count)) i = 0;
 		}
 
-#ifdef CONFIG_E1000_MQ
-		tx_ring->tx_stats.packets++;
-#endif
 
 		eop = tx_ring->buffer_info[i].next_to_watch;
 		eop_desc = E1000_TX_DESC(*tx_ring, eop);
@@ -3733,10 +3522,6 @@ e1000_clean_rx_irq(struct e1000_adapter *adapter,
 		}
 #endif /* CONFIG_E1000_NAPI */
 		netdev->last_rx = jiffies;
-#ifdef CONFIG_E1000_MQ
-		rx_ring->rx_stats.packets++;
-		rx_ring->rx_stats.bytes += length;
-#endif
 
 next_desc:
 		rx_desc->status = 0;
@@ -3878,10 +3663,6 @@ e1000_clean_rx_irq_ps(struct e1000_adapter *adapter,
 		}
 #endif /* CONFIG_E1000_NAPI */
 		netdev->last_rx = jiffies;
-#ifdef CONFIG_E1000_MQ
-		rx_ring->rx_stats.packets++;
-		rx_ring->rx_stats.bytes += length;
-#endif
 
 next_desc:
 		rx_desc->wb.middle.status_error &= ~0xFF;