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| author |   Ben Hutchings <bhutchings@solarflare.com> | 2011-01-04 15:22:36 +0000 |
|---|---|---|
| committer | Ben Hutchings <bhutchings@solarflare.com> | 2011-02-16 23:02:03 +0000 |
| commit | d4726051043dd270f9a161414a8d5ced76e91dff (patch) | |
| tree | 56c673af0e2fb116bb3368f6a1b3e60da6449f36 /drivers/net/sfc | |
| parent | net: RPS: Make hardware-accelerated RFS conditional on NETIF_F_NTUPLE (diff) | |
| download | linux-dev-d4726051043dd270f9a161414a8d5ced76e91dff.tar.xz linux-dev-d4726051043dd270f9a161414a8d5ced76e91dff.zip | |
sfc: Limit filter search depth further for performance hints (i.e. RFS)
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Diffstat (limited to 'drivers/net/sfc')
| -rw-r--r-- | drivers/net/sfc/filter.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/net/sfc/filter.c b/drivers/net/sfc/filter.c index d4722c41c4ce..47a1b7984788 100644 --- a/drivers/net/sfc/filter.c +++ b/drivers/net/sfc/filter.c @@ -27,6 +27,10 @@ */ #define FILTER_CTL_SRCH_MAX 200 +/* Don't try very hard to find space for performance hints, as this is + * counter-productive. */ +#define FILTER_CTL_SRCH_HINT_MAX 5 + enum efx_filter_table_id { EFX_FILTER_TABLE_RX_IP = 0, EFX_FILTER_TABLE_RX_MAC, @@ -325,15 +329,16 @@ static int efx_filter_search(struct efx_filter_table *table, struct efx_filter_spec *spec, u32 key, bool for_insert, int *depth_required) { - unsigned hash, incr, filter_idx, depth; + unsigned hash, incr, filter_idx, depth, depth_max; struct efx_filter_spec *cmp; hash = efx_filter_hash(key); incr = efx_filter_increment(key); + depth_max = (spec->priority <= EFX_FILTER_PRI_HINT ? + FILTER_CTL_SRCH_HINT_MAX : FILTER_CTL_SRCH_MAX); for (depth = 1, filter_idx = hash & (table->size - 1); - depth <= FILTER_CTL_SRCH_MAX && - test_bit(filter_idx, table->used_bitmap); + depth <= depth_max && test_bit(filter_idx, table->used_bitmap); ++depth) { cmp = &table->spec[filter_idx]; if (efx_filter_equal(spec, cmp)) @@ -342,7 +347,7 @@ static int efx_filter_search(struct efx_filter_table *table, } if (!for_insert) return -ENOENT; - if (depth > FILTER_CTL_SRCH_MAX) + if (depth > depth_max) return -EBUSY; found: *depth_required = depth; |