[PATCH net-next 03/13] nfp: parse the mailbox cmsg TLV

[Jakub Kicinski]

Parse the mailbox TLV.  When control message queue is not available
we can fall back to passing the control messages via the vNIC
mailbox.

Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vanderme...@netronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.c | 4 ++++
 drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.h | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.c 
b/drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.c
index 6d5213b5bcb0..6c207c5e9265 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.c
@@ -99,6 +99,10 @@ int nfp_net_tlv_caps_parse(struct device *dev, u8 __iomem 
*ctrl_mem,
 
                        caps->repr_cap = readl(data);
                        break;
+               case NFP_NET_CFG_TLV_TYPE_MBOX_CMSG_TYPES:
+                       if (length >= 4)
+                               caps->mbox_cmsg_types = readl(data);
+                       break;
                default:
                        if (!FIELD_GET(NFP_NET_CFG_TLV_HEADER_REQUIRED, hdr))
                                break;
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.h 
b/drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.h
index 25919e338071..05a5c82ac8f6 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.h
@@ -466,6 +466,11 @@
  * %NFP_NET_CFG_TLV_TYPE_REPR_CAP:
  * Single word, equivalent of %NFP_NET_CFG_CAP for representors, features which
  * can be used on representors.
+ *
+ * %NFP_NET_CFG_TLV_TYPE_MBOX_CMSG_TYPES:
+ * Variable, bitmap of control message types supported by the mailbox handler.
+ * Bit 0 corresponds to message type 0, bit 1 to 1, etc.  Control messages are
+ * encapsulated into simple TLVs, with an end TLV and written to the Mailbox.
  */
 #define NFP_NET_CFG_TLV_TYPE_UNKNOWN           0
 #define NFP_NET_CFG_TLV_TYPE_RESERVED          1
@@ -475,6 +480,7 @@
 #define NFP_NET_CFG_TLV_TYPE_EXPERIMENTAL0     5
 #define NFP_NET_CFG_TLV_TYPE_EXPERIMENTAL1     6
 #define NFP_NET_CFG_TLV_TYPE_REPR_CAP          7
+#define NFP_NET_CFG_TLV_TYPE_MBOX_CMSG_TYPES   10
 
 struct device;
 
@@ -484,12 +490,14 @@ struct device;
  * @mbox_off:          vNIC mailbox area offset
  * @mbox_len:          vNIC mailbox area length
  * @repr_cap:          capabilities for representors
+ * @mbox_cmsg_types:   cmsgs which can be passed through the mailbox
  */
 struct nfp_net_tlv_caps {
        u32 me_freq_mhz;
        unsigned int mbox_off;
        unsigned int mbox_len;
        u32 repr_cap;
+       u32 mbox_cmsg_types;
 };
 
 int nfp_net_tlv_caps_parse(struct device *dev, u8 __iomem *ctrl_mem,
-- 
2.21.0