Commit 3a3d5756 authored by Sreenivasa Honnur's avatar Sreenivasa Honnur Committed by Jeff Garzik
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S2io: Multiqueue network device support implementation 



- Resubmit #3
Multiqueue netwrok device support implementation.
- Added a loadable parameter "multiq" to enable/disable multiqueue support,
  by default it is disabled.
- skb->queue_mapping is not used for queue/fifo selection. FIFO selection is
  based on skb->priority.
- Added per FIFO flags FIFO_QUEUE_START and FIFO_QUEUE_STOP. Check this flag
  for starting and stopping netif queue and update the flags accordingly.
- In tx_intr_handler added a check to ensure that we have free TXDs before wak-
  ing up the queue.
- Added helper functions for queue manipulation(start/stop/wakeup) to invoke
  appropriate netif_ functions.
- Calling netif_start/stop for link up/down case respectively.

- As per Andi kleen's review comments, using skb->priority field for FIFO
  selection.

Signed-off-by: default avatarSurjit Reang <surjit.reang@neterion.com>
Signed-off-by: default avatarRamkrishna Vepa <ram.vepa@neterion.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 19a3da6c

drivers/net/s2io.c

+176 −30
Original line number Diff line number Diff line
@@ -50,6 +50,8 @@ 
 *                 Possible values '1' for enable , '0' for disable.

 *                 Default is '2' - which means disable in promisc mode

 *                 and enable in non-promiscuous mode.

 * multiq: This parameter used to enable/disable MULTIQUEUE support.

 *      Possible values '1' for enable and '0' for disable. Default is '0'

 ************************************************************************/



#include <linux/module.h>
@@ -458,8 +460,7 @@ MODULE_VERSION(DRV_VERSION); 
/* Module Loadable parameters. */

S2IO_PARM_INT(tx_fifo_num, 1);

S2IO_PARM_INT(rx_ring_num, 1);





S2IO_PARM_INT(multiq, 0);

S2IO_PARM_INT(rx_ring_mode, 1);

S2IO_PARM_INT(use_continuous_tx_intrs, 1);

S2IO_PARM_INT(rmac_pause_time, 0x100);
@@ -533,6 +534,101 @@ static struct pci_driver s2io_driver = { 
/* A simplifier macro used both by init and free shared_mem Fns(). */

#define TXD_MEM_PAGE_CNT(len, per_each) ((len+per_each - 1) / per_each)



/* netqueue manipulation helper functions */

static inline void s2io_stop_all_tx_queue(struct s2io_nic *sp)

{

	int i;

#ifdef CONFIG_NETDEVICES_MULTIQUEUE

	if (sp->config.multiq) {

		for (i = 0; i < sp->config.tx_fifo_num; i++)

			netif_stop_subqueue(sp->dev, i);

	} else

#endif

	{

		for (i = 0; i < sp->config.tx_fifo_num; i++)

			sp->mac_control.fifos[i].queue_state = FIFO_QUEUE_STOP;

		netif_stop_queue(sp->dev);

	}

}



static inline void s2io_stop_tx_queue(struct s2io_nic *sp, int fifo_no)

{

#ifdef CONFIG_NETDEVICES_MULTIQUEUE

	if (sp->config.multiq)

		netif_stop_subqueue(sp->dev, fifo_no);

	else

#endif

	{

		sp->mac_control.fifos[fifo_no].queue_state =

			FIFO_QUEUE_STOP;

		netif_stop_queue(sp->dev);

	}

}



static inline void s2io_start_all_tx_queue(struct s2io_nic *sp)

{

	int i;

#ifdef CONFIG_NETDEVICES_MULTIQUEUE

	if (sp->config.multiq) {

		for (i = 0; i < sp->config.tx_fifo_num; i++)

			netif_start_subqueue(sp->dev, i);

	} else

#endif

	{

		for (i = 0; i < sp->config.tx_fifo_num; i++)

			sp->mac_control.fifos[i].queue_state = FIFO_QUEUE_START;

		netif_start_queue(sp->dev);

	}

}



static inline void s2io_start_tx_queue(struct s2io_nic *sp, int fifo_no)

{

#ifdef CONFIG_NETDEVICES_MULTIQUEUE

	if (sp->config.multiq)

		netif_start_subqueue(sp->dev, fifo_no);

	else

#endif

	{

		sp->mac_control.fifos[fifo_no].queue_state =

			FIFO_QUEUE_START;

		netif_start_queue(sp->dev);

	}

}



static inline void s2io_wake_all_tx_queue(struct s2io_nic *sp)

{

	int i;

#ifdef CONFIG_NETDEVICES_MULTIQUEUE

	if (sp->config.multiq) {

		for (i = 0; i < sp->config.tx_fifo_num; i++)

			netif_wake_subqueue(sp->dev, i);

	} else

#endif

	{

		for (i = 0; i < sp->config.tx_fifo_num; i++)

			sp->mac_control.fifos[i].queue_state = FIFO_QUEUE_START;

		netif_wake_queue(sp->dev);

	}

}



static inline void s2io_wake_tx_queue(

	struct fifo_info *fifo, int cnt, u8 multiq)

{



#ifdef CONFIG_NETDEVICES_MULTIQUEUE

	if (multiq) {

		if (cnt && __netif_subqueue_stopped(fifo->dev, fifo->fifo_no))

			netif_wake_subqueue(fifo->dev, fifo->fifo_no);

	} else

#endif

	if (cnt && (fifo->queue_state == FIFO_QUEUE_STOP)) {

		if (netif_queue_stopped(fifo->dev)) {

			fifo->queue_state = FIFO_QUEUE_START;

			netif_wake_queue(fifo->dev);

		}

	}

}



/**

 * init_shared_mem - Allocation and Initialization of Memory

 * @nic: Device private variable.
@@ -614,6 +710,7 @@ static int init_shared_mem(struct s2io_nic *nic) 
		mac_control->fifos[i].fifo_no = i;

		mac_control->fifos[i].nic = nic;

		mac_control->fifos[i].max_txds = MAX_SKB_FRAGS + 2;

		mac_control->fifos[i].dev = dev;



		for (j = 0; j < page_num; j++) {

			int k = 0;
@@ -2972,10 +3069,10 @@ static void rx_intr_handler(struct ring_info *ring_data) 
static void tx_intr_handler(struct fifo_info *fifo_data)

{

	struct s2io_nic *nic = fifo_data->nic;

	struct net_device *dev = (struct net_device *) nic->dev;

	struct tx_curr_get_info get_info, put_info;

	struct sk_buff *skb;

	struct sk_buff *skb = NULL;

	struct TxD *txdlp;

	int pkt_cnt = 0;

	unsigned long flags = 0;

	u8 err_mask;
@@ -3036,6 +3133,7 @@ static void tx_intr_handler(struct fifo_info *fifo_data) 
			DBG_PRINT(ERR_DBG, "in Tx Free Intr\n");

			return;

		}

		pkt_cnt++;



		/* Updating the statistics block */

		nic->stats.tx_bytes += skb->len;
@@ -3051,8 +3149,7 @@ static void tx_intr_handler(struct fifo_info *fifo_data) 
		    get_info.offset;

	}



	if (netif_queue_stopped(dev))

		netif_wake_queue(dev);

	s2io_wake_tx_queue(fifo_data, pkt_cnt, nic->config.multiq);



	spin_unlock_irqrestore(&fifo_data->tx_lock, flags);

}
@@ -3933,8 +4030,7 @@ static int s2io_open(struct net_device *dev) 
		err = -ENODEV;

		goto hw_init_failed;

	}



	netif_start_queue(dev);

	s2io_start_all_tx_queue(sp);

	return 0;



hw_init_failed:
@@ -3979,8 +4075,7 @@ static int s2io_close(struct net_device *dev) 
	if (!is_s2io_card_up(sp))

		return 0;



	netif_stop_queue(dev);



	s2io_stop_all_tx_queue(sp);

	/* delete all populated mac entries */

	for (offset = 1; offset < config->max_mc_addr; offset++) {

		tmp64 = do_s2io_read_unicast_mc(sp, offset);
@@ -4016,7 +4111,6 @@ static int s2io_xmit(struct sk_buff *skb, struct net_device *dev) 
	struct TxFIFO_element __iomem *tx_fifo;

	unsigned long flags = 0;

	u16 vlan_tag = 0;

	int vlan_priority = 0;

	struct fifo_info *fifo = NULL;

	struct mac_info *mac_control;

	struct config_param *config;
@@ -4043,14 +4137,29 @@ static int s2io_xmit(struct sk_buff *skb, struct net_device *dev) 


	queue = 0;

	/* Get Fifo number to Transmit based on vlan priority */

	if (sp->vlgrp && vlan_tx_tag_present(skb)) {

	if (sp->vlgrp && vlan_tx_tag_present(skb))

		vlan_tag = vlan_tx_tag_get(skb);

		vlan_priority = vlan_tag >> 13;

		queue = config->fifo_mapping[vlan_priority];

	}



	/* get fifo number based on skb->priority value */

	queue = config->fifo_mapping[skb->priority & (MAX_TX_FIFOS - 1)];



	fifo = &mac_control->fifos[queue];

	spin_lock_irqsave(&fifo->tx_lock, flags);

#ifdef CONFIG_NETDEVICES_MULTIQUEUE

	if (sp->config.multiq) {

		if (__netif_subqueue_stopped(dev, fifo->fifo_no)) {

			spin_unlock_irqrestore(&fifo->tx_lock, flags);

			return NETDEV_TX_BUSY;

		}

	} else

#endif

	if (unlikely(fifo->queue_state == FIFO_QUEUE_STOP)) {

		if (netif_queue_stopped(dev)) {

			spin_unlock_irqrestore(&fifo->tx_lock, flags);

			return NETDEV_TX_BUSY;

		}

	}



	put_off = (u16) fifo->tx_curr_put_info.offset;

	get_off = (u16) fifo->tx_curr_get_info.offset;

	txdp = (struct TxD *) fifo->list_info[put_off].list_virt_addr;
@@ -4060,7 +4169,7 @@ static int s2io_xmit(struct sk_buff *skb, struct net_device *dev) 
	if (txdp->Host_Control ||

		   ((put_off+1) == queue_len ? 0 : (put_off+1)) == get_off) {

		DBG_PRINT(TX_DBG, "Error in xmit, No free TXDs.\n");

		netif_stop_queue(dev);

		s2io_stop_tx_queue(sp, fifo->fifo_no);

		dev_kfree_skb(skb);

		spin_unlock_irqrestore(&fifo->tx_lock, flags);

		return 0;
@@ -4080,7 +4189,7 @@ static int s2io_xmit(struct sk_buff *skb, struct net_device *dev) 
	txdp->Control_1 |= TXD_LIST_OWN_XENA;

	txdp->Control_2 |= TXD_INT_NUMBER(fifo->fifo_no);



	if (sp->vlgrp && vlan_tx_tag_present(skb)) {

	if (vlan_tag) {

		txdp->Control_2 |= TXD_VLAN_ENABLE;

		txdp->Control_2 |= TXD_VLAN_TAG(vlan_tag);

	}
@@ -4166,7 +4275,7 @@ static int s2io_xmit(struct sk_buff *skb, struct net_device *dev) 
		DBG_PRINT(TX_DBG,

			  "No free TxDs for xmit, Put: 0x%x Get:0x%x\n",

			  put_off, get_off);

		netif_stop_queue(dev);

		s2io_stop_tx_queue(sp, fifo->fifo_no);

	}

	mac_control->stats_info->sw_stat.mem_allocated += skb->truesize;

	dev->trans_start = jiffies;
@@ -4175,7 +4284,7 @@ static int s2io_xmit(struct sk_buff *skb, struct net_device *dev) 
	return 0;

pci_map_failed:

	stats->pci_map_fail_cnt++;

	netif_stop_queue(dev);

	s2io_stop_tx_queue(sp, fifo->fifo_no);

	stats->mem_freed += skb->truesize;

	dev_kfree_skb(skb);

	spin_unlock_irqrestore(&fifo->tx_lock, flags);
@@ -4587,7 +4696,7 @@ static void s2io_handle_errors(void * dev_id) 
	return;



reset:

	netif_stop_queue(dev);

	s2io_stop_all_tx_queue(sp);

	schedule_work(&sp->rst_timer_task);

	sw_stat->soft_reset_cnt++;

	return;
@@ -6574,16 +6683,15 @@ static int s2io_change_mtu(struct net_device *dev, int new_mtu) 


	dev->mtu = new_mtu;

	if (netif_running(dev)) {

		s2io_stop_all_tx_queue(sp);

		s2io_card_down(sp);

		netif_stop_queue(dev);

		ret = s2io_card_up(sp);

		if (ret) {

			DBG_PRINT(ERR_DBG, "%s: Device bring up failed\n",

				  __FUNCTION__);

			return ret;

		}

		if (netif_queue_stopped(dev))

			netif_wake_queue(dev);

		s2io_wake_all_tx_queue(sp);

	} else { /* Device is down */

		struct XENA_dev_config __iomem *bar0 = sp->bar0;

		u64 val64 = new_mtu;
@@ -6691,7 +6799,7 @@ static void s2io_set_link(struct work_struct *work) 
			} else {

				DBG_PRINT(ERR_DBG, "%s: Error: ", dev->name);

				DBG_PRINT(ERR_DBG, "device is not Quiescent\n");

				netif_stop_queue(dev);

				s2io_stop_all_tx_queue(nic);

			}

		}

		val64 = readq(&bar0->adapter_control);
@@ -7181,7 +7289,7 @@ static void s2io_restart_nic(struct work_struct *work) 
		DBG_PRINT(ERR_DBG, "%s: Device bring up failed\n",

			  dev->name);

	}

	netif_wake_queue(dev);

	s2io_wake_all_tx_queue(sp);

	DBG_PRINT(ERR_DBG, "%s: was reset by Tx watchdog timer\n",

		  dev->name);

out_unlock:
@@ -7460,6 +7568,7 @@ static void s2io_link(struct s2io_nic * sp, int link) 
		init_tti(sp, link);

		if (link == LINK_DOWN) {

			DBG_PRINT(ERR_DBG, "%s: Link down\n", dev->name);

			s2io_stop_all_tx_queue(sp);

			netif_carrier_off(dev);

			if(sp->mac_control.stats_info->sw_stat.link_up_cnt)

			sp->mac_control.stats_info->sw_stat.link_up_time =
@@ -7472,6 +7581,7 @@ static void s2io_link(struct s2io_nic * sp, int link) 
				jiffies - sp->start_time;

			sp->mac_control.stats_info->sw_stat.link_up_cnt++;

			netif_carrier_on(dev);

			s2io_wake_all_tx_queue(sp);

		}

	}

	sp->last_link_state = link;
@@ -7508,7 +7618,8 @@ static void s2io_init_pci(struct s2io_nic * sp) 
	pci_read_config_word(sp->pdev, PCI_COMMAND, &pci_cmd);

}



static int s2io_verify_parm(struct pci_dev *pdev, u8 *dev_intr_type)

static int s2io_verify_parm(struct pci_dev *pdev, u8 *dev_intr_type,

	u8 *dev_multiq)

{

	if ((tx_fifo_num > MAX_TX_FIFOS) ||

		(tx_fifo_num < FIFO_DEFAULT_NUM)) {
@@ -7522,6 +7633,18 @@ static int s2io_verify_parm(struct pci_dev *pdev, u8 *dev_intr_type) 
		DBG_PRINT(ERR_DBG, "tx fifos\n");

	}



#ifndef CONFIG_NETDEVICES_MULTIQUEUE

	if (multiq) {

		DBG_PRINT(ERR_DBG, "s2io: Multiqueue support not enabled\n");

		multiq = 0;

	}

#endif

	/* if multiqueue is enabled configure all fifos */

	if (multiq) {

		tx_fifo_num = MAX_TX_FIFOS;

		*dev_multiq = multiq;

	}



	if ( rx_ring_num > 8) {

		DBG_PRINT(ERR_DBG, "s2io: Requested number of Rx rings not "

			 "supported\n");
@@ -7613,9 +7736,11 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre) 
	struct config_param *config;

	int mode;

	u8 dev_intr_type = intr_type;

	u8 dev_multiq = 0;

	DECLARE_MAC_BUF(mac);



	if ((ret = s2io_verify_parm(pdev, &dev_intr_type)))

	ret = s2io_verify_parm(pdev, &dev_intr_type, &dev_multiq);

	if (ret)

		return ret;



	if ((ret = pci_enable_device(pdev))) {
@@ -7646,7 +7771,11 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre) 
		pci_disable_device(pdev);

		return -ENODEV;

	}



#ifdef CONFIG_NETDEVICES_MULTIQUEUE

	if (dev_multiq)

		dev = alloc_etherdev_mq(sizeof(struct s2io_nic), MAX_TX_FIFOS);

	else

#endif

	dev = alloc_etherdev(sizeof(struct s2io_nic));

	if (dev == NULL) {

		DBG_PRINT(ERR_DBG, "Device allocation failed\n");
@@ -7698,6 +7827,7 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre) 


	/* Tx side parameters. */

	config->tx_fifo_num = tx_fifo_num;

	config->multiq = dev_multiq;

	for (i = 0; i < MAX_TX_FIFOS; i++) {

		config->tx_cfg[i].fifo_len = tx_fifo_len[i];

		config->tx_cfg[i].fifo_priority = i;
@@ -7705,7 +7835,7 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre) 


	/* mapping the QoS priority to the configured fifos */

	for (i = 0; i < MAX_TX_FIFOS; i++)

		config->fifo_mapping[i] = fifo_map[config->tx_fifo_num][i];

		config->fifo_mapping[i] = fifo_map[config->tx_fifo_num - 1][i];



	config->tx_intr_type = TXD_INT_TYPE_UTILZ;

	for (i = 0; i < config->tx_fifo_num; i++) {
@@ -7810,7 +7940,10 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre) 
		dev->features |= NETIF_F_UFO;

		dev->features |= NETIF_F_HW_CSUM;

	}



#ifdef CONFIG_NETDEVICES_MULTIQUEUE

	if (config->multiq)

		dev->features |= NETIF_F_MULTI_QUEUE;

#endif

	dev->tx_timeout = &s2io_tx_watchdog;

	dev->watchdog_timeo = WATCH_DOG_TIMEOUT;

	INIT_WORK(&sp->rst_timer_task, s2io_restart_nic);
@@ -7959,6 +8092,10 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre) 


	if (napi)

		DBG_PRINT(ERR_DBG, "%s: NAPI enabled\n", dev->name);



	DBG_PRINT(ERR_DBG, "%s: Using %d Tx fifo(s)\n", dev->name,

		sp->config.tx_fifo_num);



	switch(sp->config.intr_type) {

		case INTA:

		    DBG_PRINT(ERR_DBG, "%s: Interrupt type INTA\n", dev->name);
@@ -7967,6 +8104,15 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre) 
		    DBG_PRINT(ERR_DBG, "%s: Interrupt type MSI-X\n", dev->name);

		    break;

	}

	if (sp->config.multiq) {

	for (i = 0; i < sp->config.tx_fifo_num; i++)

		mac_control->fifos[i].multiq = config->multiq;

		DBG_PRINT(ERR_DBG, "%s: Multiqueue support enabled\n",

			dev->name);

	} else

		DBG_PRINT(ERR_DBG, "%s: Multiqueue support disabled\n",

			dev->name);



	if (sp->lro)

		DBG_PRINT(ERR_DBG, "%s: Large receive offload enabled\n",

			  dev->name);

drivers/net/s2io.h

+10 −0
Original line number Diff line number Diff line
@@ -464,6 +464,7 @@ struct config_param { 
	int max_mc_addr;	/* xena=64 herc=256 */

	int max_mac_addr;	/* xena=16 herc=64 */

	int mc_start_offset;	/* xena=16 herc=64 */

	u8 multiq;

};



/* Structure representing MAC Addrs */
@@ -720,6 +721,15 @@ struct fifo_info { 
	 * the buffers

	 */

	struct tx_curr_get_info tx_curr_get_info;

#define FIFO_QUEUE_START 0

#define FIFO_QUEUE_STOP 1

	int queue_state;



	/* copy of sp->dev pointer */

	struct net_device *dev;



	/* copy of multiq status */

	u8 multiq;



	/* Per fifo lock */

	spinlock_t tx_lock;

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