From b883d0bd4ae91059242fd2f8c2a70f308ef63dc1 Mon Sep 17 00:00:00 2001 From: Ben Hutchings Date: Tue, 15 Jan 2013 22:00:07 +0000 Subject: sfc: Document conditions for multicast replication vs filter replacement Add the efx_filter_is_mc_recip() function to decide whether a filter is for a multicast recipient and can coexist with other filters with the same match values. Update efx_filter_insert_filter() kernel-doc to explain the conditions for this. Signed-off-by: Ben Hutchings --- drivers/net/ethernet/sfc/rx.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) (limited to 'drivers/net/ethernet/sfc/rx.c') diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c index 864b6ffc9cb2..81eab21effe9 100644 --- a/drivers/net/ethernet/sfc/rx.c +++ b/drivers/net/ethernet/sfc/rx.c @@ -903,3 +903,37 @@ bool __efx_filter_rfs_expire(struct efx_nic *efx, unsigned int quota) } #endif /* CONFIG_RFS_ACCEL */ + +/** + * efx_filter_is_mc_recipient - test whether spec is a multicast recipient + * @spec: Specification to test + * + * Return: %true if the specification is a non-drop RX filter that + * matches a local MAC address I/G bit value of 1 or matches a local + * IPv4 or IPv6 address value in the respective multicast address + * range. Otherwise %false. + */ +bool efx_filter_is_mc_recipient(const struct efx_filter_spec *spec) +{ + if (!(spec->flags & EFX_FILTER_FLAG_RX) || + spec->dmaq_id == EFX_FILTER_RX_DMAQ_ID_DROP) + return false; + + if (spec->match_flags & + (EFX_FILTER_MATCH_LOC_MAC | EFX_FILTER_MATCH_LOC_MAC_IG) && + is_multicast_ether_addr(spec->loc_mac)) + return true; + + if ((spec->match_flags & + (EFX_FILTER_MATCH_ETHER_TYPE | EFX_FILTER_MATCH_LOC_HOST)) == + (EFX_FILTER_MATCH_ETHER_TYPE | EFX_FILTER_MATCH_LOC_HOST)) { + if (spec->ether_type == htons(ETH_P_IP) && + ipv4_is_multicast(spec->loc_host[0])) + return true; + if (spec->ether_type == htons(ETH_P_IPV6) && + ((const u8 *)spec->loc_host)[0] == 0xff) + return true; + } + + return false; +} -- cgit