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enic: Add Accelerated RFS support

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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: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Govindarajulu Varadarajan
2014-06-23 16:08:02 +05:30
committed by David S. Miller
parent b6e97c132b
commit a145df23ef
6 changed files with 279 additions and 0 deletions
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41
drivers/net/ethernet/cisco/enic/enic.h
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@@ -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)