[dpdk-dev] [PATCH 1/5] common/iavf: use pad byte to specify MAC type

[Qi Zhang]

Currently, there is no way for a VF driver to specify that it wants to
change its device/primary unicast MAC address. This makes it
difficult/impossible for the PF driver to track the VF's device/primary
unicast MAC address, which is used for VM/VF reboot and displaying on
the host. Fix this by using 2 bits of a pad byte in the
virtchnl_ether_addr structure so the VF can specify what type of MAC
it's adding/deleting.

Below are the values that should be used by all VF drivers going
forward.

VIRTCHNL_ETHER_ADDR_LEGACY(0):
- The type should only ever be 0 for legacy AVF drivers (i.e.
  drivers that don't support the new type bits). The PF drivers
  will track VF's device/primary unicast MAC using with best
  effort.

VIRTCHNL_ETHER_ADDR_PRIMARY(1):
- This type should only be used when the VF is changing their
  device/primary unicast MAC. It should be used for both delete
  and add cases related to the device/primary unicast MAC.

VIRTCHNL_ETHER_ADDR_EXTRA(2):
- This type should be used when the VF is adding and/or deleting
  MAC addresses that are not the device/primary unicast MAC. For
  example, extra unicast addresses and multicast addresses
  assuming the PF supports "extra" addresses at all.

If a PF is parsing the type field of the virtchnl_ether_addr, then it
should use the VIRTCHNL_ETHER_ADDR_TYPE_MASK to mask the first two bits
of the type field since 0, 1, and 2 are the only valid values.

Signed-off-by: Brett Creeley <brett.creeley at intel.com>
Signed-off-by: Qi Zhang <qi.z.zhang at intel.com>
---
 drivers/common/iavf/virtchnl.h | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/drivers/common/iavf/virtchnl.h b/drivers/common/iavf/virtchnl.h
index 79515ee8b..d93ef31ec 100644
--- a/drivers/common/iavf/virtchnl.h
+++ b/drivers/common/iavf/virtchnl.h
@@ -435,9 +435,36 @@ VIRTCHNL_CHECK_STRUCT_LEN(12, virtchnl_queue_select);
  * PF removes the filters and returns status.
  */
 
+/* VIRTCHNL_ETHER_ADDR_LEGACY
+ * Prior to adding the @type member to virtchnl_ether_addr, there were 2 pad
+ * bytes. Moving forward all VF drivers should not set type to
+ * VIRTCHNL_ETHER_ADDR_LEGACY. This is only here to not break previous/legacy
+ * behavior. The control plane function (i.e. PF) can use a best effort method
+ * of tracking the primary/device unicast in this case, but there is no
+ * guarantee and functionality depends on the implementation of the PF.
+ */
+
+/* VIRTCHNL_ETHER_ADDR_PRIMARY
+ * All VF drivers should set @type to VIRTCHNL_ETHER_ADDR_PRIMARY for the
+ * primary/device unicast MAC address filter for VIRTCHNL_OP_ADD_ETH_ADDR and
+ * VIRTCHNL_OP_DEL_ETH_ADDR. This allows for the underlying control plane
+ * function (i.e. PF) to accurately track and use this MAC address for
+ * displaying on the host and for VM/function reset.
+ */
+
+/* VIRTCHNL_ETHER_ADDR_EXTRA
+ * All VF drivers should set @type to VIRTCHNL_ETHER_ADDR_EXTRA for any extra
+ * unicast and/or multicast filters that are being added/deleted via
+ * VIRTCHNL_OP_DEL_ETH_ADDR/VIRTCHNL_OP_ADD_ETH_ADDR respectively.
+ */
 struct virtchnl_ether_addr {
 	u8 addr[VIRTCHNL_ETH_LENGTH_OF_ADDRESS];
-	u8 pad[2];
+	u8 type;
+#define VIRTCHNL_ETHER_ADDR_LEGACY	0
+#define VIRTCHNL_ETHER_ADDR_PRIMARY	1
+#define VIRTCHNL_ETHER_ADDR_EXTRA	2
+#define VIRTCHNL_ETHER_ADDR_TYPE_MASK	3 /* first two bits of type are valid */
+	u8 pad;
 };
 
 VIRTCHNL_CHECK_STRUCT_LEN(8, virtchnl_ether_addr);
-- 
2.13.6