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authorBen Hutchings <bhutchings@solarflare.com>2013-01-15 22:00:07 +0000
committerBen Hutchings <bhutchings@solarflare.com>2013-08-29 18:12:07 +0100
commitb883d0bd4ae91059242fd2f8c2a70f308ef63dc1 (patch)
tree3f76b769a8deba7d60bf3488b2e9c4160e0fb219 /drivers/net/ethernet/sfc/rx.c
parentcade715ff18440dda53e59c10c606586c92be33e (diff)
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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 <bhutchings@solarflare.com>
Diffstat (limited to 'drivers/net/ethernet/sfc/rx.c')
-rw-r--r--drivers/net/ethernet/sfc/rx.c34
1 files changed, 34 insertions, 0 deletions
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;
+}