1 files changed, 229 insertions, 19 deletions

diff --git a/drivers/net/ethernet/netronome/nfp/bpf/main.c b/drivers/net/ethernet/netronome/nfp/bpf/main.c
index 13190aa09faf..322027792fe8 100644
--- a/drivers/net/ethernet/netronome/nfp/bpf/main.c
+++ b/drivers/net/ethernet/netronome/nfp/bpf/main.c
@@ -34,10 +34,12 @@
 #include <net/pkt_cls.h>
 
 #include "../nfpcore/nfp_cpp.h"
+#include "../nfpcore/nfp_nffw.h"
 #include "../nfp_app.h"
 #include "../nfp_main.h"
 #include "../nfp_net.h"
 #include "../nfp_port.h"
+#include "fw.h"
 #include "main.h"
 
 static bool nfp_net_ebpf_capable(struct nfp_net *nn)
@@ -52,7 +54,7 @@ static bool nfp_net_ebpf_capable(struct nfp_net *nn)
 
 static int
 nfp_bpf_xdp_offload(struct nfp_app *app, struct nfp_net *nn,
-		    struct bpf_prog *prog)
+		    struct bpf_prog *prog, struct netlink_ext_ack *extack)
 {
 	bool running, xdp_running;
 	int ret;
@@ -68,10 +70,10 @@ nfp_bpf_xdp_offload(struct nfp_app *app, struct nfp_net *nn,
 	if (prog && running && !xdp_running)
 		return -EBUSY;
 
-	ret = nfp_net_bpf_offload(nn, prog, running);
+	ret = nfp_net_bpf_offload(nn, prog, running, extack);
 	/* Stop offload if replace not possible */
 	if (ret && prog)
-		nfp_bpf_xdp_offload(app, nn, NULL);
+		nfp_bpf_xdp_offload(app, nn, NULL, extack);
 
 	nn->dp.bpf_offload_xdp = prog && !ret;
 	return ret;
@@ -85,16 +87,21 @@ static const char *nfp_bpf_extra_cap(struct nfp_app *app, struct nfp_net *nn)
 static int
 nfp_bpf_vnic_alloc(struct nfp_app *app, struct nfp_net *nn, unsigned int id)
 {
+	struct nfp_bpf_vnic *bv;
 	int err;
 
-	nn->app_priv = kzalloc(sizeof(struct nfp_bpf_vnic), GFP_KERNEL);
-	if (!nn->app_priv)
+	bv = kzalloc(sizeof(*bv), GFP_KERNEL);
+	if (!bv)
 		return -ENOMEM;
+	nn->app_priv = bv;
 
 	err = nfp_app_nic_vnic_alloc(app, nn, id);
 	if (err)
 		goto err_free_priv;
 
+	bv->start_off = nn_readw(nn, NFP_NET_CFG_BPF_START);
+	bv->tgt_done = nn_readw(nn, NFP_NET_CFG_BPF_DONE);
+
 	return 0;
 err_free_priv:
 	kfree(nn->app_priv);
@@ -105,8 +112,6 @@ static void nfp_bpf_vnic_free(struct nfp_app *app, struct nfp_net *nn)
 {
 	struct nfp_bpf_vnic *bv = nn->app_priv;
 
-	if (nn->dp.bpf_offload_xdp)
-		nfp_bpf_xdp_offload(app, nn, NULL);
 	WARN_ON(bv->tc_prog);
 	kfree(bv);
 }
@@ -120,17 +125,29 @@ static int nfp_bpf_setup_tc_block_cb(enum tc_setup_type type,
 	struct nfp_bpf_vnic *bv;
 	int err;
 
-	if (type != TC_SETUP_CLSBPF ||
-	    !tc_can_offload(nn->dp.netdev) ||
-	    !nfp_net_ebpf_capable(nn) ||
-	    cls_bpf->common.protocol != htons(ETH_P_ALL) ||
-	    cls_bpf->common.chain_index)
+	if (type != TC_SETUP_CLSBPF) {
+		NL_SET_ERR_MSG_MOD(cls_bpf->common.extack,
+				   "only offload of BPF classifiers supported");
+		return -EOPNOTSUPP;
+	}
+	if (!tc_cls_can_offload_and_chain0(nn->dp.netdev, &cls_bpf->common))
+		return -EOPNOTSUPP;
+	if (!nfp_net_ebpf_capable(nn)) {
+		NL_SET_ERR_MSG_MOD(cls_bpf->common.extack,
+				   "NFP firmware does not support eBPF offload");
 		return -EOPNOTSUPP;
+	}
+	if (cls_bpf->common.protocol != htons(ETH_P_ALL)) {
+		NL_SET_ERR_MSG_MOD(cls_bpf->common.extack,
+				   "only ETH_P_ALL supported as filter protocol");
+		return -EOPNOTSUPP;
+	}
 
 	/* Only support TC direct action */
 	if (!cls_bpf->exts_integrated ||
 	    tcf_exts_has_actions(cls_bpf->exts)) {
-		nn_err(nn, "only direct action with no legacy actions supported\n");
+		NL_SET_ERR_MSG_MOD(cls_bpf->common.extack,
+				   "only direct action with no legacy actions supported");
 		return -EOPNOTSUPP;
 	}
 
@@ -147,7 +164,8 @@ static int nfp_bpf_setup_tc_block_cb(enum tc_setup_type type,
 			return 0;
 	}
 
-	err = nfp_net_bpf_offload(nn, cls_bpf->prog, oldprog);
+	err = nfp_net_bpf_offload(nn, cls_bpf->prog, oldprog,
+				  cls_bpf->common.extack);
 	if (err)
 		return err;
 
@@ -191,23 +209,215 @@ static int nfp_bpf_setup_tc(struct nfp_app *app, struct net_device *netdev,
 
 static bool nfp_bpf_tc_busy(struct nfp_app *app, struct nfp_net *nn)
 {
-	return nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF;
+	struct nfp_bpf_vnic *bv = nn->app_priv;
+
+	return !!bv->tc_prog;
+}
+
+static int
+nfp_bpf_change_mtu(struct nfp_app *app, struct net_device *netdev, int new_mtu)
+{
+	struct nfp_net *nn = netdev_priv(netdev);
+	unsigned int max_mtu;
+
+	if (~nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF)
+		return 0;
+
+	max_mtu = nn_readb(nn, NFP_NET_CFG_BPF_INL_MTU) * 64 - 32;
+	if (new_mtu > max_mtu) {
+		nn_info(nn, "BPF offload active, MTU over %u not supported\n",
+			max_mtu);
+		return -EBUSY;
+	}
+	return 0;
+}
+
+static int
+nfp_bpf_parse_cap_adjust_head(struct nfp_app_bpf *bpf, void __iomem *value,
+			      u32 length)
+{
+	struct nfp_bpf_cap_tlv_adjust_head __iomem *cap = value;
+	struct nfp_cpp *cpp = bpf->app->pf->cpp;
+
+	if (length < sizeof(*cap)) {
+		nfp_err(cpp, "truncated adjust_head TLV: %d\n", length);
+		return -EINVAL;
+	}
+
+	bpf->adjust_head.flags = readl(&cap->flags);
+	bpf->adjust_head.off_min = readl(&cap->off_min);
+	bpf->adjust_head.off_max = readl(&cap->off_max);
+	bpf->adjust_head.guaranteed_sub = readl(&cap->guaranteed_sub);
+	bpf->adjust_head.guaranteed_add = readl(&cap->guaranteed_add);
+
+	if (bpf->adjust_head.off_min > bpf->adjust_head.off_max) {
+		nfp_err(cpp, "invalid adjust_head TLV: min > max\n");
+		return -EINVAL;
+	}
+	if (!FIELD_FIT(UR_REG_IMM_MAX, bpf->adjust_head.off_min) ||
+	    !FIELD_FIT(UR_REG_IMM_MAX, bpf->adjust_head.off_max)) {
+		nfp_warn(cpp, "disabling adjust_head - driver expects min/max to fit in as immediates\n");
+		memset(&bpf->adjust_head, 0, sizeof(bpf->adjust_head));
+		return 0;
+	}
+
+	return 0;
+}
+
+static int
+nfp_bpf_parse_cap_func(struct nfp_app_bpf *bpf, void __iomem *value, u32 length)
+{
+	struct nfp_bpf_cap_tlv_func __iomem *cap = value;
+
+	if (length < sizeof(*cap)) {
+		nfp_err(bpf->app->cpp, "truncated function TLV: %d\n", length);
+		return -EINVAL;
+	}
+
+	switch (readl(&cap->func_id)) {
+	case BPF_FUNC_map_lookup_elem:
+		bpf->helpers.map_lookup = readl(&cap->func_addr);
+		break;
+	}
+
+	return 0;
+}
+
+static int
+nfp_bpf_parse_cap_maps(struct nfp_app_bpf *bpf, void __iomem *value, u32 length)
+{
+	struct nfp_bpf_cap_tlv_maps __iomem *cap = value;
+
+	if (length < sizeof(*cap)) {
+		nfp_err(bpf->app->cpp, "truncated maps TLV: %d\n", length);
+		return -EINVAL;
+	}
+
+	bpf->maps.types = readl(&cap->types);
+	bpf->maps.max_maps = readl(&cap->max_maps);
+	bpf->maps.max_elems = readl(&cap->max_elems);
+	bpf->maps.max_key_sz = readl(&cap->max_key_sz);
+	bpf->maps.max_val_sz = readl(&cap->max_val_sz);
+	bpf->maps.max_elem_sz = readl(&cap->max_elem_sz);
+
+	return 0;
+}
+
+static int nfp_bpf_parse_capabilities(struct nfp_app *app)
+{
+	struct nfp_cpp *cpp = app->pf->cpp;
+	struct nfp_cpp_area *area;
+	u8 __iomem *mem, *start;
+
+	mem = nfp_rtsym_map(app->pf->rtbl, "_abi_bpf_capabilities", "bpf.cap",
+			    8, &area);
+	if (IS_ERR(mem))
+		return PTR_ERR(mem) == -ENOENT ? 0 : PTR_ERR(mem);
+
+	start = mem;
+	while (mem - start + 8 < nfp_cpp_area_size(area)) {
+		u8 __iomem *value;
+		u32 type, length;
+
+		type = readl(mem);
+		length = readl(mem + 4);
+		value = mem + 8;
+
+		mem += 8 + length;
+		if (mem - start > nfp_cpp_area_size(area))
+			goto err_release_free;
+
+		switch (type) {
+		case NFP_BPF_CAP_TYPE_FUNC:
+			if (nfp_bpf_parse_cap_func(app->priv, value, length))
+				goto err_release_free;
+			break;
+		case NFP_BPF_CAP_TYPE_ADJUST_HEAD:
+			if (nfp_bpf_parse_cap_adjust_head(app->priv, value,
+							  length))
+				goto err_release_free;
+			break;
+		case NFP_BPF_CAP_TYPE_MAPS:
+			if (nfp_bpf_parse_cap_maps(app->priv, value, length))
+				goto err_release_free;
+			break;
+		default:
+			nfp_dbg(cpp, "unknown BPF capability: %d\n", type);
+			break;
+		}
+	}
+	if (mem - start != nfp_cpp_area_size(area)) {
+		nfp_err(cpp, "BPF capabilities left after parsing, parsed:%zd total length:%zu\n",
+			mem - start, nfp_cpp_area_size(area));
+		goto err_release_free;
+	}
+
+	nfp_cpp_area_release_free(area);
+
+	return 0;
+
+err_release_free:
+	nfp_err(cpp, "invalid BPF capabilities at offset:%zd\n", mem - start);
+	nfp_cpp_area_release_free(area);
+	return -EINVAL;
+}
+
+static int nfp_bpf_init(struct nfp_app *app)
+{
+	struct nfp_app_bpf *bpf;
+	int err;
+
+	bpf = kzalloc(sizeof(*bpf), GFP_KERNEL);
+	if (!bpf)
+		return -ENOMEM;
+	bpf->app = app;
+	app->priv = bpf;
+
+	skb_queue_head_init(&bpf->cmsg_replies);
+	init_waitqueue_head(&bpf->cmsg_wq);
+	INIT_LIST_HEAD(&bpf->map_list);
+
+	err = nfp_bpf_parse_capabilities(app);
+	if (err)
+		goto err_free_bpf;
+
+	return 0;
+
+err_free_bpf:
+	kfree(bpf);
+	return err;
+}
+
+static void nfp_bpf_clean(struct nfp_app *app)
+{
+	struct nfp_app_bpf *bpf = app->priv;
+
+	WARN_ON(!skb_queue_empty(&bpf->cmsg_replies));
+	WARN_ON(!list_empty(&bpf->map_list));
+	WARN_ON(bpf->maps_in_use || bpf->map_elems_in_use);
+	kfree(bpf);
 }
 
 const struct nfp_app_type app_bpf = {
 	.id		= NFP_APP_BPF_NIC,
 	.name		= "ebpf",
 
+	.ctrl_cap_mask	= 0,
+
+	.init		= nfp_bpf_init,
+	.clean		= nfp_bpf_clean,
+
+	.change_mtu	= nfp_bpf_change_mtu,
+
 	.extra_cap	= nfp_bpf_extra_cap,
 
 	.vnic_alloc	= nfp_bpf_vnic_alloc,
 	.vnic_free	= nfp_bpf_vnic_free,
 
+	.ctrl_msg_rx	= nfp_bpf_ctrl_msg_rx,
+
 	.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,
 };