nfp: hand over to BPF offload app at coarser granularity

Instead of having an app callback per message type hand off
all offload-related handling to apps with one "rest of ndo_bpf"
callback.
Signed-off-by: NJakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: NQuentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>

drivers/net/ethernet/netronome/nfp/bpf/main.c

@@ -345,9 +345,6 @@ const struct nfp_app_type app_bpf = {
 
 	.setup_tc	= nfp_bpf_setup_tc,
 	.tc_busy	= nfp_bpf_tc_busy,
+	.bpf		= nfp_ndo_bpf,
 	.xdp_offload	= nfp_bpf_xdp_offload,
-
-	.bpf_verifier_prep	= nfp_bpf_verifier_prep,
-	.bpf_translate		= nfp_bpf_translate,
-	.bpf_destroy		= nfp_bpf_destroy,
 };

drivers/net/ethernet/netronome/nfp/bpf/main.h

@@ -256,15 +256,11 @@ struct netdev_bpf;
 struct nfp_app;
 struct nfp_net;
 
+int nfp_ndo_bpf(struct nfp_app *app, struct nfp_net *nn,
+		struct netdev_bpf *bpf);
 int nfp_net_bpf_offload(struct nfp_net *nn, struct bpf_prog *prog,
 			bool old_prog);
 
-int nfp_bpf_verifier_prep(struct nfp_app *app, struct nfp_net *nn,
-			  struct netdev_bpf *bpf);
-int nfp_bpf_translate(struct nfp_app *app, struct nfp_net *nn,
-		      struct bpf_prog *prog);
-int nfp_bpf_destroy(struct nfp_app *app, struct nfp_net *nn,
-		    struct bpf_prog *prog);
 struct nfp_insn_meta *
 nfp_bpf_goto_meta(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
 		  unsigned int insn_idx, unsigned int n_insns);

drivers/net/ethernet/netronome/nfp/bpf/offload.c

@@ -87,7 +87,8 @@ static void nfp_prog_free(struct nfp_prog *nfp_prog)
 	kfree(nfp_prog);
 }
 
-int nfp_bpf_verifier_prep(struct nfp_app *app, struct nfp_net *nn,
+static int
+nfp_bpf_verifier_prep(struct nfp_app *app, struct nfp_net *nn,
 		      struct netdev_bpf *bpf)
 {
 	struct bpf_prog *prog = bpf->verifier.prog;
@@ -118,8 +119,7 @@ int nfp_bpf_verifier_prep(struct nfp_app *app, struct nfp_net *nn,
 	return ret;
 }
 
-int nfp_bpf_translate(struct nfp_app *app, struct nfp_net *nn,
-		      struct bpf_prog *prog)
+static int nfp_bpf_translate(struct nfp_net *nn, struct bpf_prog *prog)
 {
 	struct nfp_prog *nfp_prog = prog->aux->offload->dev_priv;
 	unsigned int stack_size;
@@ -143,8 +143,7 @@ int nfp_bpf_translate(struct nfp_app *app, struct nfp_net *nn,
 	return nfp_bpf_jit(nfp_prog);
 }
 
-int nfp_bpf_destroy(struct nfp_app *app, struct nfp_net *nn,
-		    struct bpf_prog *prog)
+static int nfp_bpf_destroy(struct nfp_net *nn, struct bpf_prog *prog)
 {
 	struct nfp_prog *nfp_prog = prog->aux->offload->dev_priv;
 
@@ -154,6 +153,20 @@ int nfp_bpf_destroy(struct nfp_app *app, struct nfp_net *nn,
 	return 0;
 }
 
+int nfp_ndo_bpf(struct nfp_app *app, struct nfp_net *nn, struct netdev_bpf *bpf)
+{
+	switch (bpf->command) {
+	case BPF_OFFLOAD_VERIFIER_PREP:
+		return nfp_bpf_verifier_prep(app, nn, bpf);
+	case BPF_OFFLOAD_TRANSLATE:
+		return nfp_bpf_translate(nn, bpf->offload.prog);
+	case BPF_OFFLOAD_DESTROY:
+		return nfp_bpf_destroy(nn, bpf->offload.prog);
+	default:
+		return -EINVAL;
+	}
+}
+
 static int nfp_net_bpf_load(struct nfp_net *nn, struct bpf_prog *prog)
 {
 	struct nfp_prog *nfp_prog = prog->aux->offload->dev_priv;

drivers/net/ethernet/netronome/nfp/nfp_app.h

@@ -89,10 +89,8 @@ extern const struct nfp_app_type app_flower;
  * @ctrl_msg_rx:    control message handler
  * @setup_tc:	setup TC ndo
  * @tc_busy:	TC HW offload busy (rules loaded)
+ * @bpf:	BPF ndo offload-related calls
  * @xdp_offload:    offload an XDP program
- * @bpf_verifier_prep:	verifier prep for dev-specific BPF programs
- * @bpf_translate:	translate call for dev-specific BPF programs
- * @bpf_destroy:	destroy for dev-specific BPF programs
  * @eswitch_mode_get:    get SR-IOV eswitch mode
  * @sriov_enable: app-specific sriov initialisation
  * @sriov_disable: app-specific sriov clean-up
@@ -133,14 +131,10 @@ struct nfp_app_type {
 	int (*setup_tc)(struct nfp_app *app, struct net_device *netdev,
 			enum tc_setup_type type, void *type_data);
 	bool (*tc_busy)(struct nfp_app *app, struct nfp_net *nn);
+	int (*bpf)(struct nfp_app *app, struct nfp_net *nn,
+		   struct netdev_bpf *xdp);
 	int (*xdp_offload)(struct nfp_app *app, struct nfp_net *nn,
 			   struct bpf_prog *prog);
-	int (*bpf_verifier_prep)(struct nfp_app *app, struct nfp_net *nn,
-				 struct netdev_bpf *bpf);
-	int (*bpf_translate)(struct nfp_app *app, struct nfp_net *nn,
-			     struct bpf_prog *prog);
-	int (*bpf_destroy)(struct nfp_app *app, struct nfp_net *nn,
-			   struct bpf_prog *prog);
 
 	int (*sriov_enable)(struct nfp_app *app, int num_vfs);
 	void (*sriov_disable)(struct nfp_app *app);
@@ -316,39 +310,20 @@ static inline int nfp_app_setup_tc(struct nfp_app *app,
 	return app->type->setup_tc(app, netdev, type, type_data);
 }
 
-static inline int nfp_app_xdp_offload(struct nfp_app *app, struct nfp_net *nn,
-				      struct bpf_prog *prog)
-{
-	if (!app || !app->type->xdp_offload)
-		return -EOPNOTSUPP;
-	return app->type->xdp_offload(app, nn, prog);
-}
-
-static inline int
-nfp_app_bpf_verifier_prep(struct nfp_app *app, struct nfp_net *nn,
+static inline int nfp_app_bpf(struct nfp_app *app, struct nfp_net *nn,
 			      struct netdev_bpf *bpf)
 {
-	if (!app || !app->type->bpf_verifier_prep)
-		return -EOPNOTSUPP;
-	return app->type->bpf_verifier_prep(app, nn, bpf);
-}
-
-static inline int
-nfp_app_bpf_translate(struct nfp_app *app, struct nfp_net *nn,
-		      struct bpf_prog *prog)
-{
-	if (!app || !app->type->bpf_translate)
-		return -EOPNOTSUPP;
-	return app->type->bpf_translate(app, nn, prog);
+	if (!app || !app->type->bpf)
+		return -EINVAL;
+	return app->type->bpf(app, nn, bpf);
 }
 
-static inline int
-nfp_app_bpf_destroy(struct nfp_app *app, struct nfp_net *nn,
+static inline int nfp_app_xdp_offload(struct nfp_app *app, struct nfp_net *nn,
 				      struct bpf_prog *prog)
 {
-	if (!app || !app->type->bpf_destroy)
+	if (!app || !app->type->xdp_offload)
 		return -EOPNOTSUPP;
-	return app->type->bpf_destroy(app, nn, prog);
+	return app->type->xdp_offload(app, nn, prog);
 }
 
 static inline bool nfp_app_ctrl_tx(struct nfp_app *app, struct sk_buff *skb)

drivers/net/ethernet/netronome/nfp/nfp_net_common.c

@@ -3414,16 +3414,8 @@ static int nfp_net_xdp(struct net_device *netdev, struct netdev_bpf *xdp)
 		xdp->prog_id = nn->xdp_prog ? nn->xdp_prog->aux->id : 0;
 		xdp->prog_flags = nn->xdp_prog ? nn->xdp_flags : 0;
 		return 0;
-	case BPF_OFFLOAD_VERIFIER_PREP:
-		return nfp_app_bpf_verifier_prep(nn->app, nn, xdp);
-	case BPF_OFFLOAD_TRANSLATE:
-		return nfp_app_bpf_translate(nn->app, nn,
-					     xdp->offload.prog);
-	case BPF_OFFLOAD_DESTROY:
-		return nfp_app_bpf_destroy(nn->app, nn,
-					   xdp->offload.prog);
 	default:
-		return -EINVAL;
+		return nfp_app_bpf(nn->app, nn, xdp);
 	}
 }