From: Jakub Kicinski <jakub.kicinski@netronome.com>
Date: Mon, 21 May 2018 22:12:51 -0700
Subject: nfp: add devlink_eswitch_mode_set callback
Patch-mainline: v4.18-rc1
Git-commit: 4afa3af4181edda539cce7889a6efcde0e6a0a5c
References: bsc#1109837

Our previous apps all assumed to use only one eswitch mode (legacy
or switchdev) without the ability to change it.  ABM NIC will
want to support the switch so plumb devlink_eswitch_mode_set through.
The devlink_eswitch_mode_set is expected to spawn representors and
potentially devlink ports so it's called under big devlink lock and
pf->lock.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/netronome/nfp/nfp_app.h     |    9 +++++++++
 drivers/net/ethernet/netronome/nfp/nfp_devlink.c |   13 +++++++++++++
 2 files changed, 22 insertions(+)

--- a/drivers/net/ethernet/netronome/nfp/nfp_app.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_app.h
@@ -97,6 +97,7 @@ extern const struct nfp_app_type app_abm
  * @bpf:	BPF ndo offload-related calls
  * @xdp_offload:    offload an XDP program
  * @eswitch_mode_get:    get SR-IOV eswitch mode
+ * @eswitch_mode_set:    set SR-IOV eswitch mode (under pf->lock)
  * @sriov_enable: app-specific sriov initialisation
  * @sriov_disable: app-specific sriov clean-up
  * @repr_get:	get representor netdev
@@ -148,6 +149,7 @@ struct nfp_app_type {
 	void (*sriov_disable)(struct nfp_app *app);
 
 	enum devlink_eswitch_mode (*eswitch_mode_get)(struct nfp_app *app);
+	int (*eswitch_mode_set)(struct nfp_app *app, u16 mode);
 	struct net_device *(*repr_get)(struct nfp_app *app, u32 id);
 };
 
@@ -372,6 +374,13 @@ static inline int nfp_app_eswitch_mode_g
 	return 0;
 }
 
+static inline int nfp_app_eswitch_mode_set(struct nfp_app *app, u16 mode)
+{
+	if (!app->type->eswitch_mode_set)
+		return -EOPNOTSUPP;
+	return app->type->eswitch_mode_set(app, mode);
+}
+
 static inline int nfp_app_sriov_enable(struct nfp_app *app, int num_vfs)
 {
 	if (!app || !app->type->sriov_enable)
--- a/drivers/net/ethernet/netronome/nfp/nfp_devlink.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_devlink.c
@@ -176,12 +176,25 @@ static int nfp_devlink_eswitch_mode_get(
 	return nfp_app_eswitch_mode_get(pf->app, mode);
 }
 
+static int nfp_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode)
+{
+	struct nfp_pf *pf = devlink_priv(devlink);
+	int ret;
+
+	mutex_lock(&pf->lock);
+	ret = nfp_app_eswitch_mode_set(pf->app, mode);
+	mutex_unlock(&pf->lock);
+
+	return ret;
+}
+
 const struct devlink_ops nfp_devlink_ops = {
 	.port_split		= nfp_devlink_port_split,
 	.port_unsplit		= nfp_devlink_port_unsplit,
 	.sb_pool_get		= nfp_devlink_sb_pool_get,
 	.sb_pool_set		= nfp_devlink_sb_pool_set,
 	.eswitch_mode_get	= nfp_devlink_eswitch_mode_get,
+	.eswitch_mode_set	= nfp_devlink_eswitch_mode_set,
 };
 
 int nfp_devlink_port_register(struct nfp_app *app, struct nfp_port *port)