sfc: allow insertion of filters for unicast PTP

Add a second list for unicast filters and generalize the
efx_ptp_insert/remove_filters functions to allow acting in any of the 2
lists.

No filters for unicast are inserted yet. That will be done in the next
patch.

The reason to use 2 different lists instead of a single one is that, in
next patches, we will want to check if unicast filters are already added
and if they're expired. We don't need that for multicast filters.
Reported-by: Yalin Li <yalli@redhat.com>
Signed-off-by: Íñigo Huguet <ihuguet@redhat.com>
Reviewed-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/sfc/ptp.c

@@ -239,6 +239,7 @@ struct efx_ptp_rxfilter {
  * @reset_required: A serious error has occurred and the PTP task needs to be
  *                  reset (disable, enable).
  * @rxfilters_mcast: Receive filters for multicast PTP packets
+ * @rxfilters_ucast: Receive filters for unicast PTP packets
  * @config: Current timestamp configuration
  * @enabled: PTP operation enabled
  * @mode: Mode in which PTP operating (PTP version)
@@ -308,6 +309,7 @@ struct efx_ptp_data {
 	struct work_struct work;
 	bool reset_required;
 	struct list_head rxfilters_mcast;
+	struct list_head rxfilters_ucast;
 	struct hwtstamp_config config;
 	bool enabled;
 	unsigned int mode;
@@ -1296,12 +1298,12 @@ static inline void efx_ptp_process_rx(struct efx_nic *efx, struct sk_buff *skb)
 	local_bh_enable();
 }
 
-static void efx_ptp_remove_multicast_filters(struct efx_nic *efx)
+static void efx_ptp_remove_filters(struct efx_nic *efx,
+				   struct list_head *filter_list)
 {
-	struct efx_ptp_data *ptp = efx->ptp_data;
 	struct efx_ptp_rxfilter *rxfilter, *tmp;
 
-	list_for_each_entry_safe(rxfilter, tmp, &ptp->rxfilters_mcast, list) {
+	list_for_each_entry_safe(rxfilter, tmp, filter_list, list) {
 		efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED,
 					  rxfilter->handle);
 		list_del(&rxfilter->list);
@@ -1320,9 +1322,9 @@ static void efx_ptp_init_filter(struct efx_nic *efx,
 }
 
 static int efx_ptp_insert_filter(struct efx_nic *efx,
+				 struct list_head *filter_list,
 				 struct efx_filter_spec *spec)
 {
-	struct efx_ptp_data *ptp = efx->ptp_data;
 	struct efx_ptp_rxfilter *rxfilter;
 	int rc;
 
@@ -1335,7 +1337,7 @@ static int efx_ptp_insert_filter(struct efx_nic *efx,
 		goto fail;
 
 	rxfilter->handle = rc;
-	list_add(&rxfilter->list, &ptp->rxfilters_mcast);
+	list_add(&rxfilter->list, filter_list);
 
 	return 0;
 
@@ -1344,28 +1346,31 @@ static int efx_ptp_insert_filter(struct efx_nic *efx,
 	return rc;
 }
 
-static int efx_ptp_insert_ipv4_filter(struct efx_nic *efx, u16 port)
+static int efx_ptp_insert_ipv4_filter(struct efx_nic *efx,
+				      struct list_head *filter_list,
+				      __be32 addr, u16 port)
 {
 	struct efx_filter_spec spec;
 
 	efx_ptp_init_filter(efx, &spec);
-	efx_filter_set_ipv4_local(&spec, IPPROTO_UDP, htonl(PTP_ADDR_IPV4),
-				  htons(port));
-	return efx_ptp_insert_filter(efx, &spec);
+	efx_filter_set_ipv4_local(&spec, IPPROTO_UDP, addr, htons(port));
+	return efx_ptp_insert_filter(efx, filter_list, &spec);
 }
 
-static int efx_ptp_insert_ipv6_filter(struct efx_nic *efx, u16 port)
+static int efx_ptp_insert_ipv6_filter(struct efx_nic *efx,
+				      struct list_head *filter_list,
+				      struct in6_addr *addr, u16 port)
 {
-	const struct in6_addr addr = {{PTP_ADDR_IPV6}};
 	struct efx_filter_spec spec;
 
 	efx_ptp_init_filter(efx, &spec);
-	efx_filter_set_ipv6_local(&spec, IPPROTO_UDP, &addr, htons(port));
-	return efx_ptp_insert_filter(efx, &spec);
+	efx_filter_set_ipv6_local(&spec, IPPROTO_UDP, addr, htons(port));
+	return efx_ptp_insert_filter(efx, filter_list, &spec);
 }
 
-static int efx_ptp_insert_eth_filter(struct efx_nic *efx)
+static int efx_ptp_insert_eth_multicast_filter(struct efx_nic *efx)
 {
+	struct efx_ptp_data *ptp = efx->ptp_data;
 	const u8 addr[ETH_ALEN] = PTP_ADDR_ETHER;
 	struct efx_filter_spec spec;
 
@@ -1373,7 +1378,7 @@ static int efx_ptp_insert_eth_filter(struct efx_nic *efx)
 	efx_filter_set_eth_local(&spec, EFX_FILTER_VID_UNSPEC, addr);
 	spec.match_flags |= EFX_FILTER_MATCH_ETHER_TYPE;
 	spec.ether_type = htons(ETH_P_1588);
-	return efx_ptp_insert_filter(efx, &spec);
+	return efx_ptp_insert_filter(efx, &ptp->rxfilters_mcast, &spec);
 }
 
 static int efx_ptp_insert_multicast_filters(struct efx_nic *efx)
@@ -1387,11 +1392,13 @@ static int efx_ptp_insert_multicast_filters(struct efx_nic *efx)
 	/* Must filter on both event and general ports to ensure
 	 * that there is no packet re-ordering.
 	 */
-	rc = efx_ptp_insert_ipv4_filter(efx, PTP_EVENT_PORT);
+	rc = efx_ptp_insert_ipv4_filter(efx, &ptp->rxfilters_mcast,
+					htonl(PTP_ADDR_IPV4), PTP_EVENT_PORT);
 	if (rc < 0)
 		goto fail;
 
-	rc = efx_ptp_insert_ipv4_filter(efx, PTP_GENERAL_PORT);
+	rc = efx_ptp_insert_ipv4_filter(efx, &ptp->rxfilters_mcast,
+					htonl(PTP_ADDR_IPV4), PTP_GENERAL_PORT);
 	if (rc < 0)
 		goto fail;
 
@@ -1399,15 +1406,19 @@ static int efx_ptp_insert_multicast_filters(struct efx_nic *efx)
 	 * PTP over IPv6 and Ethernet
 	 */
 	if (efx_ptp_use_mac_tx_timestamps(efx)) {
-		rc = efx_ptp_insert_ipv6_filter(efx, PTP_EVENT_PORT);
+		struct in6_addr ipv6_addr = {{PTP_ADDR_IPV6}};
+
+		rc = efx_ptp_insert_ipv6_filter(efx, &ptp->rxfilters_mcast,
+						&ipv6_addr, PTP_EVENT_PORT);
 		if (rc < 0)
 			goto fail;
 
-		rc = efx_ptp_insert_ipv6_filter(efx, PTP_GENERAL_PORT);
+		rc = efx_ptp_insert_ipv6_filter(efx, &ptp->rxfilters_mcast,
+						&ipv6_addr, PTP_GENERAL_PORT);
 		if (rc < 0)
 			goto fail;
 
-		rc = efx_ptp_insert_eth_filter(efx);
+		rc = efx_ptp_insert_eth_multicast_filter(efx);
 		if (rc < 0)
 			goto fail;
 	}
@@ -1415,7 +1426,7 @@ static int efx_ptp_insert_multicast_filters(struct efx_nic *efx)
 	return 0;
 
 fail:
-	efx_ptp_remove_multicast_filters(efx);
+	efx_ptp_remove_filters(efx, &ptp->rxfilters_mcast);
 	return rc;
 }
 
@@ -1440,7 +1451,7 @@ static int efx_ptp_start(struct efx_nic *efx)
 	return 0;
 
 fail:
-	efx_ptp_remove_multicast_filters(efx);
+	efx_ptp_remove_filters(efx, &ptp->rxfilters_mcast);
 	return rc;
 }
 
@@ -1456,7 +1467,8 @@ static int efx_ptp_stop(struct efx_nic *efx)
 
 	rc = efx_ptp_disable(efx);
 
-	efx_ptp_remove_multicast_filters(efx);
+	efx_ptp_remove_filters(efx, &ptp->rxfilters_mcast);
+	efx_ptp_remove_filters(efx, &ptp->rxfilters_ucast);
 
 	/* Make sure RX packets are really delivered */
 	efx_ptp_deliver_rx_queue(&efx->ptp_data->rxq);
@@ -1588,6 +1600,7 @@ int efx_ptp_probe(struct efx_nic *efx, struct efx_channel *channel)
 		list_add(&ptp->rx_evts[pos].link, &ptp->evt_free_list);
 
 	INIT_LIST_HEAD(&ptp->rxfilters_mcast);
+	INIT_LIST_HEAD(&ptp->rxfilters_ucast);
 
 	/* Get the NIC PTP attributes and set up time conversions */
 	rc = efx_ptp_get_attributes(efx);