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Commit a145df23 authored by Govindarajulu Varadarajan's avatar Govindarajulu Varadarajan Committed by David S. Miller
Browse files

enic: Add Accelerated RFS support 



This patch adds supports for Accelerated Receive Flow Steering.

When the desired rx is different from current rq, for a flow, kernel calls the
driver function enic_rx_flow_steer(). enic_rx_flow_steer adds a IP-TCP/UDP
hardware filter.

Driver registers a timer function enic_flow_may_expire. This function is called
every HZ/4 seconds. In this function we check if the added filter has expired
by calling rps_may_expire_flow(). If the flow has expired, it removes the hw
filter.

As of now adaptor supports only IPv4 - TCP/UDP filters.

Signed-off-by: default avatarGovindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b6e97c13

drivers/net/ethernet/cisco/enic/enic.h

+41 −0
Original line number Diff line number Diff line
@@ -99,6 +99,44 @@ struct enic_port_profile { 
	u8 mac_addr[ETH_ALEN];

};



#ifdef CONFIG_RFS_ACCEL

/* enic_rfs_fltr_node - rfs filter node in hash table

 *	@@keys: IPv4 5 tuple

 *	@flow_id: flow_id of clsf filter provided by kernel

 *	@fltr_id: filter id of clsf filter returned by adaptor

 *	@rq_id: desired rq index

 *	@node: hlist_node

 */

struct enic_rfs_fltr_node {

	struct flow_keys keys;

	u32 flow_id;

	u16 fltr_id;

	u16 rq_id;

	struct hlist_node node;

};



/* enic_rfs_flw_tbl - rfs flow table

 *	@max: Maximum number of filters vNIC supports

 *	@free: Number of free filters available

 *	@toclean: hash table index to clean next

 *	@ht_head: hash table list head

 *	@lock: spin lock

 *	@rfs_may_expire: timer function for enic_rps_may_expire_flow

 */

struct enic_rfs_flw_tbl {

	u16 max;

	int free;



#define ENIC_RFS_FLW_BITSHIFT	(10)

#define ENIC_RFS_FLW_MASK	((1 << ENIC_RFS_FLW_BITSHIFT) - 1)

	u16 toclean:ENIC_RFS_FLW_BITSHIFT;

	struct hlist_head ht_head[1 << ENIC_RFS_FLW_BITSHIFT];

	spinlock_t lock;

	struct timer_list rfs_may_expire;

};



#endif /* CONFIG_RFS_ACCEL */



/* Per-instance private data structure */

struct enic {

	struct net_device *netdev;
@@ -150,6 +188,9 @@ struct enic { 
	/* completion queue cache line section */

	____cacheline_aligned struct vnic_cq cq[ENIC_CQ_MAX];

	unsigned int cq_count;

#ifdef CONFIG_RFS_ACCEL

	struct enic_rfs_flw_tbl rfs_h;

#endif

};



static inline struct device *enic_get_dev(struct enic *enic)

drivers/net/ethernet/cisco/enic/enic_clsf.c

+213 −0
Original line number Diff line number Diff line
@@ -64,3 +64,216 @@ int enic_delfltr(struct enic *enic, u16 filter_id) 


	return ret;

}



#ifdef CONFIG_RFS_ACCEL

void enic_flow_may_expire(unsigned long data)

{

	struct enic *enic = (struct enic *)data;

	bool res;

	int j;



	spin_lock(&enic->rfs_h.lock);

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

		struct hlist_head *hhead;

		struct hlist_node *tmp;

		struct enic_rfs_fltr_node *n;



		hhead = &enic->rfs_h.ht_head[enic->rfs_h.toclean++];

		hlist_for_each_entry_safe(n, tmp, hhead, node) {

			res = rps_may_expire_flow(enic->netdev, n->rq_id,

						  n->flow_id, n->fltr_id);

			if (res) {

				res = enic_delfltr(enic, n->fltr_id);

				if (unlikely(res))

					continue;

				hlist_del(&n->node);

				kfree(n);

				enic->rfs_h.free++;

			}

		}

	}

	spin_unlock(&enic->rfs_h.lock);

	mod_timer(&enic->rfs_h.rfs_may_expire, jiffies + HZ/4);

}



/* enic_rfs_flw_tbl_init - initialize enic->rfs_h members

 *	@enic: enic data

 */

void enic_rfs_flw_tbl_init(struct enic *enic)

{

	int i;



	spin_lock_init(&enic->rfs_h.lock);

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

		INIT_HLIST_HEAD(&enic->rfs_h.ht_head[i]);

	enic->rfs_h.max = enic->config.num_arfs;

	enic->rfs_h.free = enic->rfs_h.max;

	enic->rfs_h.toclean = 0;

	init_timer(&enic->rfs_h.rfs_may_expire);

	enic->rfs_h.rfs_may_expire.function = enic_flow_may_expire;

	enic->rfs_h.rfs_may_expire.data = (unsigned long)enic;

	mod_timer(&enic->rfs_h.rfs_may_expire, jiffies + HZ/4);

}



void enic_rfs_flw_tbl_free(struct enic *enic)

{

	int i, res;



	del_timer_sync(&enic->rfs_h.rfs_may_expire);

	spin_lock(&enic->rfs_h.lock);

	enic->rfs_h.free = 0;

	for (i = 0; i < (1 << ENIC_RFS_FLW_BITSHIFT); i++) {

		struct hlist_head *hhead;

		struct hlist_node *tmp;

		struct enic_rfs_fltr_node *n;



		hhead = &enic->rfs_h.ht_head[i];

		hlist_for_each_entry_safe(n, tmp, hhead, node) {

			enic_delfltr(enic, n->fltr_id);

			hlist_del(&n->node);

			kfree(n);

		}

	}

	spin_unlock(&enic->rfs_h.lock);

}



static struct enic_rfs_fltr_node *htbl_key_search(struct hlist_head *h,

						  struct flow_keys *k)

{

	struct enic_rfs_fltr_node *tpos;



	hlist_for_each_entry(tpos, h, node)

		if (tpos->keys.src == k->src &&

		    tpos->keys.dst == k->dst &&

		    tpos->keys.ports == k->ports &&

		    tpos->keys.ip_proto == k->ip_proto &&

		    tpos->keys.n_proto == k->n_proto)

			return tpos;

	return NULL;

}



int enic_rx_flow_steer(struct net_device *dev, const struct sk_buff *skb,

		       u16 rxq_index, u32 flow_id)

{

	struct flow_keys keys;

	struct enic_rfs_fltr_node *n;

	struct enic *enic;

	u16 tbl_idx;

	int res, i;



	enic = netdev_priv(dev);

	res = skb_flow_dissect(skb, &keys);

	if (!res || keys.n_proto != htons(ETH_P_IP) ||

	    (keys.ip_proto != IPPROTO_TCP && keys.ip_proto != IPPROTO_UDP))

		return -EPROTONOSUPPORT;



	tbl_idx = skb_get_hash_raw(skb) & ENIC_RFS_FLW_MASK;

	spin_lock(&enic->rfs_h.lock);

	n = htbl_key_search(&enic->rfs_h.ht_head[tbl_idx], &keys);



	if (n) { /* entry already present  */

		if (rxq_index == n->rq_id) {

			res = -EEXIST;

			goto ret_unlock;

		}



		/* desired rq changed for the flow, we need to delete

		 * old fltr and add new one

		 *

		 * The moment we delete the fltr, the upcoming pkts

		 * are put it default rq based on rss. When we add

		 * new filter, upcoming pkts are put in desired queue.

		 * This could cause ooo pkts.

		 *

		 * Lets 1st try adding new fltr and then del old one.

		 */

		i = --enic->rfs_h.free;

		/* clsf tbl is full, we have to del old fltr first*/

		if (unlikely(i < 0)) {

			enic->rfs_h.free++;

			res = enic_delfltr(enic, n->fltr_id);

			if (unlikely(res < 0))

				goto ret_unlock;

			res = enic_addfltr_5t(enic, &keys, rxq_index);

			if (res < 0) {

				hlist_del(&n->node);

				enic->rfs_h.free++;

				goto ret_unlock;

			}

		/* add new fltr 1st then del old fltr */

		} else {

			int ret;



			res = enic_addfltr_5t(enic, &keys, rxq_index);

			if (res < 0) {

				enic->rfs_h.free++;

				goto ret_unlock;

			}

			ret = enic_delfltr(enic, n->fltr_id);

			/* deleting old fltr failed. Add old fltr to list.

			 * enic_flow_may_expire() will try to delete it later.

			 */

			if (unlikely(ret < 0)) {

				struct enic_rfs_fltr_node *d;

				struct hlist_head *head;



				head = &enic->rfs_h.ht_head[tbl_idx];

				d = kmalloc(sizeof(*d), GFP_ATOMIC);

				if (d) {

					d->fltr_id = n->fltr_id;

					INIT_HLIST_NODE(&d->node);

					hlist_add_head(&d->node, head);

				}

			} else {

				enic->rfs_h.free++;

			}

		}

		n->rq_id = rxq_index;

		n->fltr_id = res;

		n->flow_id = flow_id;

	/* entry not present */

	} else {

		i = --enic->rfs_h.free;

		if (i <= 0) {

			enic->rfs_h.free++;

			res = -EBUSY;

			goto ret_unlock;

		}



		n = kmalloc(sizeof(*n), GFP_ATOMIC);

		if (!n) {

			res = -ENOMEM;

			enic->rfs_h.free++;

			goto ret_unlock;

		}



		res = enic_addfltr_5t(enic, &keys, rxq_index);

		if (res < 0) {

			kfree(n);

			enic->rfs_h.free++;

			goto ret_unlock;

		}

		n->rq_id = rxq_index;

		n->fltr_id = res;

		n->flow_id = flow_id;

		n->keys = keys;

		INIT_HLIST_NODE(&n->node);

		hlist_add_head(&n->node, &enic->rfs_h.ht_head[tbl_idx]);

	}



ret_unlock:

	spin_unlock(&enic->rfs_h.lock);

	return res;

}



#else



void enic_rfs_flw_tbl_init(struct enic *enic)

{

}



void enic_rfs_flw_tbl_free(struct enic *enic)

{

}



#endif /* CONFIG_RFS_ACCEL */

drivers/net/ethernet/cisco/enic/enic_clsf.h

+9 −0
Original line number Diff line number Diff line
@@ -4,7 +4,16 @@ 
#include "vnic_dev.h"

#include "enic.h"



#define ENIC_CLSF_EXPIRE_COUNT 128



int enic_addfltr_5t(struct enic *enic, struct flow_keys *keys, u16 rq);

int enic_delfltr(struct enic *enic, u16 filter_id);



#ifdef CONFIG_RFS_ACCEL

void enic_rfs_flw_tbl_init(struct enic *enic);

void enic_rfs_flw_tbl_free(struct enic *enic);

int enic_rx_flow_steer(struct net_device *dev, const struct sk_buff *skb,

		       u16 rxq_index, u32 flow_id);

#endif /* CONFIG_RFS_ACCEL */



#endif /* _ENIC_CLSF_H_ */

drivers/net/ethernet/cisco/enic/enic_main.c

+13 −0
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ 
#include "enic.h"

#include "enic_dev.h"

#include "enic_pp.h"

#include "enic_clsf.h"



#define ENIC_NOTIFY_TIMER_PERIOD	(2 * HZ)

#define WQ_ENET_MAX_DESC_LEN		(1 << WQ_ENET_LEN_BITS)
@@ -1546,6 +1547,7 @@ static int enic_open(struct net_device *netdev) 
		vnic_intr_unmask(&enic->intr[i]);



	enic_notify_timer_start(enic);

	enic_rfs_flw_tbl_init(enic);



	return 0;
@@ -1572,6 +1574,7 @@ static int enic_stop(struct net_device *netdev) 
	enic_synchronize_irqs(enic);



	del_timer_sync(&enic->notify_timer);

	enic_rfs_flw_tbl_free(enic);



	enic_dev_disable(enic);
@@ -2064,6 +2067,9 @@ static const struct net_device_ops enic_netdev_dynamic_ops = { 
#ifdef CONFIG_NET_POLL_CONTROLLER

	.ndo_poll_controller	= enic_poll_controller,

#endif

#ifdef CONFIG_RFS_ACCEL

	.ndo_rx_flow_steer	= enic_rx_flow_steer,

#endif

};



static const struct net_device_ops enic_netdev_ops = {
@@ -2084,6 +2090,9 @@ static const struct net_device_ops enic_netdev_ops = { 
#ifdef CONFIG_NET_POLL_CONTROLLER

	.ndo_poll_controller	= enic_poll_controller,

#endif

#ifdef CONFIG_RFS_ACCEL

	.ndo_rx_flow_steer	= enic_rx_flow_steer,

#endif

};



static void enic_dev_deinit(struct enic *enic)
@@ -2429,6 +2438,10 @@ static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 


	netdev->features |= netdev->hw_features;



#ifdef CONFIG_RFS_ACCEL

	netdev->hw_features |= NETIF_F_NTUPLE;

#endif



	if (using_dac)

		netdev->features |= NETIF_F_HIGHDMA;

drivers/net/ethernet/cisco/enic/enic_res.c

+1 −0
Original line number Diff line number Diff line
@@ -71,6 +71,7 @@ int enic_get_vnic_config(struct enic *enic) 
	GET_CONFIG(intr_mode);

	GET_CONFIG(intr_timer_usec);

	GET_CONFIG(loop_tag);

	GET_CONFIG(num_arfs);



	c->wq_desc_count =

		min_t(u32, ENIC_MAX_WQ_DESCS,