[PATCH net-next 04/15] nfp: add support for indirect HWinfo lookup

[Jakub Kicinski <jakub.kicinski@netronome.com>]

Management FW can adjust some of the information in the HWinfo table
at runtime.  In some cases reading the table directly will not yield
correct results.  Add a NSP command for looking up information.
Up until now we weren't making use of any of the values which may
get adjusted.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
---
 .../ethernet/netronome/nfp/nfpcore/nfp_nsp.c  | 38 +++++++++++++++++++
 .../ethernet/netronome/nfp/nfpcore/nfp_nsp.h  |  6 +++
 2 files changed, 44 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
index 9eb7b5a91bb1..bf593a6b26a1 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
@@ -90,6 +90,8 @@
 #define NFP_FW_LOAD_RET_MAJOR	GENMASK(15, 8)
 #define NFP_FW_LOAD_RET_MINOR	GENMASK(23, 16)
 
+#define NFP_HWINFO_LOOKUP_SIZE	GENMASK(11, 0)
+
 enum nfp_nsp_cmd {
 	SPCODE_NOOP		= 0, /* No operation */
 	SPCODE_SOFT_RESET	= 1, /* Soft reset the NFP */
@@ -104,6 +106,7 @@ enum nfp_nsp_cmd {
 	SPCODE_NSP_SENSORS	= 12, /* Read NSP sensor(s) */
 	SPCODE_NSP_IDENTIFY	= 13, /* Read NSP version */
 	SPCODE_FW_STORED	= 16, /* If no FW loaded, load flash app FW */
+	SPCODE_HWINFO_LOOKUP	= 17, /* Lookup HWinfo with overwrites etc. */
 };
 
 static const struct {
@@ -703,3 +706,38 @@ int nfp_nsp_load_stored_fw(struct nfp_nsp *state)
 	nfp_nsp_load_fw_extended_msg(state, ret);
 	return 0;
 }
+
+static int
+__nfp_nsp_hwinfo_lookup(struct nfp_nsp *state, void *buf, unsigned int size)
+{
+	struct nfp_nsp_command_buf_arg hwinfo_lookup = {
+		{
+			.code		= SPCODE_HWINFO_LOOKUP,
+			.option		= size,
+		},
+		.in_buf		= buf,
+		.in_size	= size,
+		.out_buf	= buf,
+		.out_size	= size,
+	};
+
+	return nfp_nsp_command_buf(state, &hwinfo_lookup);
+}
+
+int nfp_nsp_hwinfo_lookup(struct nfp_nsp *state, void *buf, unsigned int size)
+{
+	int err;
+
+	size = min_t(u32, size, NFP_HWINFO_LOOKUP_SIZE);
+
+	err = __nfp_nsp_hwinfo_lookup(state, buf, size);
+	if (err)
+		return err;
+
+	if (strnlen(buf, size) == size) {
+		nfp_err(state->cpp, "NSP HWinfo value not NULL-terminated\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
index 65f2d4a6de02..bd6c9071c8e9 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
@@ -51,6 +51,7 @@ int nfp_nsp_load_fw(struct nfp_nsp *state, const struct firmware *fw);
 int nfp_nsp_write_flash(struct nfp_nsp *state, const struct firmware *fw);
 int nfp_nsp_mac_reinit(struct nfp_nsp *state);
 int nfp_nsp_load_stored_fw(struct nfp_nsp *state);
+int nfp_nsp_hwinfo_lookup(struct nfp_nsp *state, void *buf, unsigned int size);
 
 static inline bool nfp_nsp_has_mac_reinit(struct nfp_nsp *state)
 {
@@ -62,6 +63,11 @@ static inline bool nfp_nsp_has_stored_fw_load(struct nfp_nsp *state)
 	return nfp_nsp_get_abi_ver_minor(state) > 23;
 }
 
+static inline bool nfp_nsp_has_hwinfo_lookup(struct nfp_nsp *state)
+{
+	return nfp_nsp_get_abi_ver_minor(state) > 24;
+}
+
 enum nfp_eth_interface {
 	NFP_INTERFACE_NONE	= 0,
 	NFP_INTERFACE_SFP	= 1,
-- 
2.17.1