From: Jakub Kicinski <jakub.kicinski@netronome.com>
Date: Sat, 4 Nov 2017 16:48:55 +0100
Subject: nfp: make use of MAC reinit
Patch-mainline: v4.15-rc1
Git-commit: 7717c319d8c025aba426f10f41a9d7f9ea8af192
References: bsc#1109837

Recent management FW images can perform full reinit of MAC cores
without requiring a reboot.  When loading the driver check if there
are changes pending and if so call NSP MAC reinit.  Full application
FW reload is still required, and all MACs need to be reinited at the
same time (not only the ones which have been reconfigured, and thus
potentially causing disruption to unrelated netdevs) therefore for
now changing MAC config without reloading the driver still remains
future work.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Tested-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/netronome/nfp/nfp_main.c        |   28 ++++++++++++++++++-
 drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c |    2 -
 drivers/net/ethernet/netronome/nfp/nfp_net_main.c    |    2 -
 drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c |    5 +++
 drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h |    6 ++++
 5 files changed, 40 insertions(+), 3 deletions(-)

--- a/drivers/net/ethernet/netronome/nfp/nfp_main.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_main.c
@@ -346,6 +346,32 @@ exit_release_fw:
 	return err < 0 ? err : 1;
 }
 
+static void
+nfp_nsp_init_ports(struct pci_dev *pdev, struct nfp_pf *pf,
+		   struct nfp_nsp *nsp)
+{
+	bool needs_reinit = false;
+	int i;
+
+	pf->eth_tbl = __nfp_eth_read_ports(pf->cpp, nsp);
+	if (!pf->eth_tbl)
+		return;
+
+	if (!nfp_nsp_has_mac_reinit(nsp))
+		return;
+
+	for (i = 0; i < pf->eth_tbl->count; i++)
+		needs_reinit |= pf->eth_tbl->ports[i].override_changed;
+	if (!needs_reinit)
+		return;
+
+	kfree(pf->eth_tbl);
+	if (nfp_nsp_mac_reinit(nsp))
+		dev_warn(&pdev->dev, "MAC reinit failed\n");
+
+	pf->eth_tbl = __nfp_eth_read_ports(pf->cpp, nsp);
+}
+
 static int nfp_nsp_init(struct pci_dev *pdev, struct nfp_pf *pf)
 {
 	struct nfp_nsp *nsp;
@@ -366,7 +392,7 @@ static int nfp_nsp_init(struct pci_dev *
 	if (err < 0)
 		goto exit_close_nsp;
 
-	pf->eth_tbl = __nfp_eth_read_ports(pf->cpp, nsp);
+	nfp_nsp_init_ports(pdev, pf, nsp);
 
 	pf->nspi = __nfp_nsp_identify(nsp);
 	if (pf->nspi)
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c
@@ -328,7 +328,7 @@ nfp_net_set_link_ksettings(struct net_de
 		return -EOPNOTSUPP;
 
 	if (netif_running(netdev)) {
-		netdev_warn(netdev, "Changing settings not allowed on an active interface. It may cause the port to be disabled until reboot.\n");
+		netdev_warn(netdev, "Changing settings not allowed on an active interface. It may cause the port to be disabled until driver reload.\n");
 		return -EBUSY;
 	}
 
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_main.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_main.c
@@ -597,7 +597,7 @@ nfp_net_eth_port_update(struct nfp_cpp *
 		return -EIO;
 	}
 	if (eth_port->override_changed) {
-		nfp_warn(cpp, "Port #%d config changed, unregistering. Reboot required before port will be operational again.\n", port->eth_id);
+		nfp_warn(cpp, "Port #%d config changed, unregistering. Driver reload required before port will be operational again.\n", port->eth_id);
 		port->type = NFP_PORT_INVALID;
 	}
 
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
@@ -477,6 +477,11 @@ int nfp_nsp_device_soft_reset(struct nfp
 	return nfp_nsp_command(state, SPCODE_SOFT_RESET, 0, 0, 0);
 }
 
+int nfp_nsp_mac_reinit(struct nfp_nsp *state)
+{
+	return nfp_nsp_command(state, SPCODE_MAC_INIT, 0, 0, 0);
+}
+
 int nfp_nsp_load_fw(struct nfp_nsp *state, const struct firmware *fw)
 {
 	return nfp_nsp_command_buf(state, SPCODE_FW_LOAD, fw->size, fw->data,
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
@@ -48,6 +48,12 @@ u16 nfp_nsp_get_abi_ver_minor(struct nfp
 int nfp_nsp_wait(struct nfp_nsp *state);
 int nfp_nsp_device_soft_reset(struct nfp_nsp *state);
 int nfp_nsp_load_fw(struct nfp_nsp *state, const struct firmware *fw);
+int nfp_nsp_mac_reinit(struct nfp_nsp *state);
+
+static inline bool nfp_nsp_has_mac_reinit(struct nfp_nsp *state)
+{
+	return nfp_nsp_get_abi_ver_minor(state) > 20;
+}
 
 enum nfp_eth_interface {
 	NFP_INTERFACE_NONE	= 0,