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sfc: Implement hardware acceleration of RFS

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Use the existing filter management functions to insert TCP/IPv4 and
UDP/IPv4 4-tuple filters for Receive Flow Steering.

For each channel, track how many RFS filters are being added during
processing of received packets and scan the corresponding number of
table entries for filters that may be reclaimed.  Do this in batches
to reduce lock overhead.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings
2011-01-05 00:50:41 +00:00
parent d472605104
commit 64d8ad6d74
4 changed files with 169 additions and 2 deletions
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15
drivers/net/sfc/efx.h
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@@ -76,6 +76,21 @@ extern int efx_filter_remove_filter(struct efx_nic *efx,
struct efx_filter_spec *spec);
extern void efx_filter_clear_rx(struct efx_nic *efx,
enum efx_filter_priority priority);
#ifdef CONFIG_RFS_ACCEL
extern int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
u16 rxq_index, u32 flow_id);
extern bool __efx_filter_rfs_expire(struct efx_nic *efx, unsigned quota);
static inline void efx_filter_rfs_expire(struct efx_channel *channel)
{
if (channel->rfs_filters_added >= 60 &&
__efx_filter_rfs_expire(channel->efx, 100))
channel->rfs_filters_added -= 60;
}
#define efx_filter_rfs_enabled() 1
#else
static inline void efx_filter_rfs_expire(struct efx_channel *channel) {}
#define efx_filter_rfs_enabled() 0
#endif
/* Channels */
extern void efx_process_channel_now(struct efx_channel *channel);