netdev - [PATCH net-next v2 02/13] nfp: bump the nsp major version to support multi-PF

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Date: Wed, 16 Aug 2023 16:39:01 +0200
From: Louis Peens <louis.peens@...igine.com>
To: David Miller <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <simon.horman@...igine.com>,
	Yinjun Zhang <yinjun.zhang@...igine.com>,
	Tianyu Yuan <tianyu.yuan@...igine.com>,
	netdev@...r.kernel.org,
	oss-drivers@...igine.com
Subject: [PATCH net-next v2 02/13] nfp: bump the nsp major version to support multi-PF

From: Tianyu Yuan <tianyu.yuan@...igine.com>

Currently NFP NICs implement single PF with multiple ports
instantiated. While NFP3800 can support multiple PFs and
one port per PF is more up-to-date, the management firmware
will start to support multi-PF. Since it's incompatible with
current implementation, the ABI major version is bumped.

A new flag is also introduced to indicate whether it's
multi-PF setup or single-PF setup.

Signed-off-by: Tianyu Yuan <tianyu.yuan@...igine.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@...igine.com>
Acked-by: Simon Horman <simon.horman@...igine.com>
Signed-off-by: Louis Peens <louis.peens@...igine.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_main.c      |  3 +++
 drivers/net/ethernet/netronome/nfp/nfp_main.h      |  6 ++++++
 .../net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c   | 14 ++++++++++----
 3 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_main.c b/drivers/net/ethernet/netronome/nfp/nfp_main.c
index 71301dbd8fb5..39c1327625fa 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_main.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_main.c
@@ -625,6 +625,9 @@ static int nfp_nsp_init(struct pci_dev *pdev, struct nfp_pf *pf)
 		return err;
 	}
 
+	pf->multi_pf.en = pdev->multifunction;
+	dev_info(&pdev->dev, "%s-PF detected\n", pf->multi_pf.en ? "Multi" : "Single");
+
 	err = nfp_nsp_wait(nsp);
 	if (err < 0)
 		goto exit_close_nsp;
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_main.h b/drivers/net/ethernet/netronome/nfp/nfp_main.h
index 14a751bfe1fe..72ea3b83d313 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_main.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_main.h
@@ -84,6 +84,8 @@ struct nfp_dumpspec {
  * @port_refresh_work:	Work entry for taking netdevs out
  * @shared_bufs:	Array of shared buffer structures if FW has any SBs
  * @num_shared_bufs:	Number of elements in @shared_bufs
+ * @multi_pf:		Used in multi-PF setup
+ * @multi_pf.en:	True if it's a NIC with multiple PFs
  *
  * Fields which may change after proble are protected by devlink instance lock.
  */
@@ -141,6 +143,10 @@ struct nfp_pf {
 
 	struct nfp_shared_buf *shared_bufs;
 	unsigned int num_shared_bufs;
+
+	struct {
+		bool en;
+	} multi_pf;
 };
 
 extern struct pci_driver nfp_netvf_pci_driver;
diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
index ee934663c6d9..3098a9e52138 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
@@ -59,7 +59,13 @@
 #define NFP_CAP_CMD_DMA_SG	0x28
 
 #define NSP_MAGIC		0xab10
-#define NSP_MAJOR		0
+/* ABI major version is bumped separately without resetting minor
+ * version when the change in NSP is not compatible to old driver.
+ */
+#define NSP_MAJOR		1
+/* ABI minor version is bumped when new feature is introduced
+ * while old driver can still work without this new feature.
+ */
 #define NSP_MINOR		8
 
 #define NSP_CODE_MAJOR		GENMASK(15, 12)
@@ -248,14 +254,14 @@ static int nfp_nsp_check(struct nfp_nsp *state)
 	state->ver.major = FIELD_GET(NSP_STATUS_MAJOR, reg);
 	state->ver.minor = FIELD_GET(NSP_STATUS_MINOR, reg);
 
-	if (state->ver.major != NSP_MAJOR) {
+	if (state->ver.major > NSP_MAJOR) {
 		nfp_err(cpp, "Unsupported ABI %hu.%hu\n",
 			state->ver.major, state->ver.minor);
 		return -EINVAL;
 	}
 	if (state->ver.minor < NSP_MINOR) {
-		nfp_err(cpp, "ABI too old to support NIC operation (%u.%hu < %u.%u), please update the management FW on the flash\n",
-			NSP_MAJOR, state->ver.minor, NSP_MAJOR, NSP_MINOR);
+		nfp_err(cpp, "ABI too old to support NIC operation (x.%u < x.%u), please update the management FW on the flash\n",
+			state->ver.minor, NSP_MINOR);
 		return -EINVAL;
 	}
 
-- 
2.34.1