From b1f9284b4e6e5f7a44d6af3e111b33e61b261f26 Mon Sep 17 00:00:00 2001 From: Ben Hutchings Date: Tue, 3 Jan 2012 12:05:15 +0000 Subject: [PATCH] sfc: Change filter ID generation to satisfy priority semantics of RX NFC Also add note that the efx_filter_spec::priority field has nothing to do with priority between multiple matching filters. Signed-off-by: Ben Hutchings Signed-off-by: David S. Miller --- drivers/net/ethernet/sfc/filter.c | 43 +++++++++++++++++++++++++++---- drivers/net/ethernet/sfc/filter.h | 5 ++++ 2 files changed, 43 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/sfc/filter.c b/drivers/net/ethernet/sfc/filter.c index 2b9636f96e05..1e079bd31bb9 100644 --- a/drivers/net/ethernet/sfc/filter.c +++ b/drivers/net/ethernet/sfc/filter.c @@ -366,12 +366,45 @@ static int efx_filter_search(struct efx_filter_table *table, } } -/* Construct/deconstruct external filter IDs */ +/* + * Construct/deconstruct external filter IDs. These must be ordered + * by matching priority, for RX NFC semantics. + * + * Each RX MAC filter entry has a flag for whether it can override an + * RX IP filter that also matches. So we assign locations for MAC + * filters with overriding behaviour, then for IP filters, then for + * MAC filters without overriding behaviour. + */ + +#define EFX_FILTER_INDEX_WIDTH 13 +#define EFX_FILTER_INDEX_MASK ((1 << EFX_FILTER_INDEX_WIDTH) - 1) + +static inline u32 efx_filter_make_id(enum efx_filter_table_id table_id, + unsigned int index, u8 flags) +{ + return (table_id == EFX_FILTER_TABLE_RX_MAC && + flags & EFX_FILTER_FLAG_RX_OVERRIDE_IP) ? + index : + (table_id + 1) << EFX_FILTER_INDEX_WIDTH | index; +} + +static inline enum efx_filter_table_id efx_filter_id_table_id(u32 id) +{ + return (id <= EFX_FILTER_INDEX_MASK) ? + EFX_FILTER_TABLE_RX_MAC : + (id >> EFX_FILTER_INDEX_WIDTH) - 1; +} + +static inline unsigned int efx_filter_id_index(u32 id) +{ + return id & EFX_FILTER_INDEX_MASK; +} -static inline int -efx_filter_make_id(enum efx_filter_table_id table_id, unsigned index) +static inline u8 efx_filter_id_flags(u32 id) { - return table_id << 16 | index; + return (id <= EFX_FILTER_INDEX_MASK) ? + EFX_FILTER_FLAG_RX | EFX_FILTER_FLAG_RX_OVERRIDE_IP : + EFX_FILTER_FLAG_RX; } /** @@ -439,7 +472,7 @@ int efx_filter_insert_filter(struct efx_nic *efx, struct efx_filter_spec *spec, netif_vdbg(efx, hw, efx->net_dev, "%s: filter type %d index %d rxq %u set", __func__, spec->type, filter_idx, spec->dmaq_id); - rc = efx_filter_make_id(table->id, filter_idx); + rc = efx_filter_make_id(table->id, filter_idx, spec->flags); out: spin_unlock_bh(&state->lock); diff --git a/drivers/net/ethernet/sfc/filter.h b/drivers/net/ethernet/sfc/filter.h index 872f2132a496..dc9a256831d1 100644 --- a/drivers/net/ethernet/sfc/filter.h +++ b/drivers/net/ethernet/sfc/filter.h @@ -78,6 +78,11 @@ enum efx_filter_flags { * * Use the efx_filter_set_*() functions to initialise the @type and * @data fields. + * + * The @priority field is used by software to determine whether a new + * filter may replace an old one. The hardware priority of a filter + * depends on the filter type and %EFX_FILTER_FLAG_RX_OVERRIDE_IP + * flag. */ struct efx_filter_spec { u8 type:4; -- 2.20.1