sfc: make capability checking a nic_type function

Various MCDI functions (especially in filter handling) need to check the
datapath caps, but those live in nic_data (since they don't exist on
Siena). Decouple from ef10-specific data structures by adding check_caps
to the nic_type, to allow using these functions from non-ef10 drivers.

Also add a convenience macro efx_has_cap() to reduce the amount of
boilerplate involved in calling it.

Signed-off-by: Edward Cree <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/sfc/ef10.c

···
 	return rc;
 }
 
+static unsigned int ef10_check_caps(const struct efx_nic *efx,
+				    u8 flag,
+				    u32 offset)
+{
+	const struct efx_ef10_nic_data *nic_data = efx->nic_data;
+
+	switch (offset) {
+	case(MC_CMD_GET_CAPABILITIES_V4_OUT_FLAGS1_OFST):
+		return nic_data->datapath_caps & BIT_ULL(flag);
+	case(MC_CMD_GET_CAPABILITIES_V4_OUT_FLAGS2_OFST):
+		return nic_data->datapath_caps2 & BIT_ULL(flag);
+	default:
+		return 0;
+	}
+}
+
 #define EF10_OFFLOAD_FEATURES		\
 	(NETIF_F_IP_CSUM |		\
 	 NETIF_F_HW_VLAN_CTAG_FILTER |	\
···
 	.hwtstamp_filters = 1 << HWTSTAMP_FILTER_NONE |
 			    1 << HWTSTAMP_FILTER_ALL,
 	.rx_hash_key_size = 40,
+	.check_caps = ef10_check_caps,
 };
 
 const struct efx_nic_type efx_hunt_a0_nic_type = {
···
 	.hwtstamp_filters = 1 << HWTSTAMP_FILTER_NONE |
 			    1 << HWTSTAMP_FILTER_ALL,
 	.rx_hash_key_size = 40,
+	.check_caps = ef10_check_caps,
 };

drivers/net/ethernet/sfc/mcdi.h

···
 #define MCDI_EVENT_FIELD(_ev, _field)			\
 	EFX_QWORD_FIELD(_ev, MCDI_EVENT_ ## _field)
 
+#define MCDI_CAPABILITY(field)						\
+	MC_CMD_GET_CAPABILITIES_V4_OUT_ ## field ## _LBN
+
+#define MCDI_CAPABILITY_OFST(field) \
+	MC_CMD_GET_CAPABILITIES_V4_OUT_ ## field ## _OFST
+
+/* field is FLAGS1 or FLAGS2 */
+#define efx_has_cap(efx, flag, field) \
+	efx->type->check_caps(efx, \
+			      MCDI_CAPABILITY(flag), \
+			      MCDI_CAPABILITY_OFST(field))
+
 void efx_mcdi_print_fwver(struct efx_nic *efx, char *buf, size_t len);
 int efx_mcdi_get_board_cfg(struct efx_nic *efx, u8 *mac_address,
 			   u16 *fw_subtype_list, u32 *capabilities);

drivers/net/ethernet/sfc/net_driver.h

···
 	void (*get_wol)(struct efx_nic *efx, struct ethtool_wolinfo *wol);
 	int (*set_wol)(struct efx_nic *efx, u32 type);
 	void (*resume_wol)(struct efx_nic *efx);
+	unsigned int (*check_caps)(const struct efx_nic *efx,
+				   u8 flag,
+				   u32 offset);
 	int (*test_chip)(struct efx_nic *efx, struct efx_self_tests *tests);
 	int (*test_nvram)(struct efx_nic *efx);
 	void (*mcdi_request)(struct efx_nic *efx,

drivers/net/ethernet/sfc/siena.c

···
 
 #endif /* CONFIG_SFC_MTD */
 
+unsigned int siena_check_caps(const struct efx_nic *efx,
+			      u8 flag, u32 offset)
+{
+	/* Siena did not support MC_CMD_GET_CAPABILITIES */
+	return 0;
+}
+
 /**************************************************************************
  *
  * Revision-dependent attributes used by efx.c and nic.c