[PATCH net-next 1/9] net: atlantic: correct L3L4 filter flow_type masking and IPv6 handling masking and IPv6 handling

[sukhdeeps]

From: Sukhdeep Singh <sukhdeeps@xxxxxxxxxxx>

Correct three issues in aq_set_data_fl3l4() required for the AQC113
PTP filter path introduced later in this series:

1. Mask FLOW_EXT from flow_type before the protocol switch statement.
   Flow types with FLOW_EXT set (e.g. TCP_V4_FLOW | FLOW_EXT) fall
   through to the default case and skip protocol comparison flags.

2. Extend the L3 address comparison check to cover all four IPv6
   words. The original code only checked ip_src[0]/ip_dst[0] and
   required !is_ipv6, so CMP_SRC_ADDR_L3/CMP_DEST_ADDR_L3 were never
   set for IPv6 filters.

3. Use explicit flow type checks for port extraction instead of
   negating IP_USER_FLOW/IPV6_USER_FLOW. The old check did not mask
   FLOW_EXT, so IP_USER_FLOW | FLOW_EXT would incorrectly attempt
   port extraction. Use the actual flow type to pick the correct
   union member directly.

Signed-off-by: Sukhdeep Singh <sukhdeeps@xxxxxxxxxxx>
---
 .../ethernet/aquantia/atlantic/aq_filters.c   | 33 ++++++++++---------
 1 file changed, 17 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_filters.c b/drivers/net/ethernet/aquantia/atlantic/aq_filters.c
index e419c73b32ce..eef52f23166d 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_filters.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_filters.c
@@ -472,6 +472,7 @@ static int aq_set_data_fl3l4(struct aq_nic_s *aq_nic,
 {
 	struct aq_hw_rx_fltrs_s *rx_fltrs = aq_get_hw_rx_fltrs(aq_nic);
 	const struct ethtool_rx_flow_spec *fsp = &aq_rx_fltr->aq_fsp;
+	u32 flow = fsp->flow_type & ~FLOW_EXT;
 
 	memset(data, 0, sizeof(*data));
 
@@ -490,7 +491,7 @@ static int aq_set_data_fl3l4(struct aq_nic_s *aq_nic,
 
 	data->cmd |= HW_ATL_RX_ENABLE_FLTR_L3L4;
 
-	switch (fsp->flow_type) {
+	switch (flow) {
 	case TCP_V4_FLOW:
 	case TCP_V6_FLOW:
 		data->cmd |= HW_ATL_RX_ENABLE_CMP_PROT_L4;
@@ -527,23 +528,23 @@ static int aq_set_data_fl3l4(struct aq_nic_s *aq_nic,
 		}
 		data->cmd |= HW_ATL_RX_ENABLE_L3_IPV6;
 	}
-	if (fsp->flow_type != IP_USER_FLOW &&
-	    fsp->flow_type != IPV6_USER_FLOW) {
-		if (!data->is_ipv6) {
-			data->p_dst =
-				ntohs(fsp->h_u.tcp_ip4_spec.pdst);
-			data->p_src =
-				ntohs(fsp->h_u.tcp_ip4_spec.psrc);
-		} else {
-			data->p_dst =
-				ntohs(fsp->h_u.tcp_ip6_spec.pdst);
-			data->p_src =
-				ntohs(fsp->h_u.tcp_ip6_spec.psrc);
-		}
+	if (flow == TCP_V4_FLOW || flow == UDP_V4_FLOW ||
+	    flow == SCTP_V4_FLOW) {
+		data->p_dst = ntohs(fsp->h_u.tcp_ip4_spec.pdst);
+		data->p_src = ntohs(fsp->h_u.tcp_ip4_spec.psrc);
+	}
+	if (flow == TCP_V6_FLOW || flow == UDP_V6_FLOW ||
+	    flow == SCTP_V6_FLOW) {
+		data->p_dst = ntohs(fsp->h_u.tcp_ip6_spec.pdst);
+		data->p_src = ntohs(fsp->h_u.tcp_ip6_spec.psrc);
 	}
-	if (data->ip_src[0] && !data->is_ipv6)
+	if (data->ip_src[0] ||
+	    (data->is_ipv6 && (data->ip_src[1] || data->ip_src[2] ||
+			       data->ip_src[3])))
 		data->cmd |= HW_ATL_RX_ENABLE_CMP_SRC_ADDR_L3;
-	if (data->ip_dst[0] && !data->is_ipv6)
+	if (data->ip_dst[0] ||
+	    (data->is_ipv6 && (data->ip_dst[1] || data->ip_dst[2] ||
+			       data->ip_dst[3])))
 		data->cmd |= HW_ATL_RX_ENABLE_CMP_DEST_ADDR_L3;
 	if (data->p_dst)
 		data->cmd |= HW_ATL_RX_ENABLE_CMP_DEST_PORT_L4;
-- 
2.43.0