1 files changed, 547 insertions, 0 deletions

diff --git a/drivers/net/ethernet/netronome/nfp/bpf/main.c b/drivers/net/ethernet/netronome/nfp/bpf/main.c
new file mode 100644
index 000000000..f469950c7
--- /dev/null
+++ b/drivers/net/ethernet/netronome/nfp/bpf/main.c
@@ -0,0 +1,547 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/* Copyright (C) 2017-2018 Netronome Systems, Inc. */
+
+#include <net/pkt_cls.h>
+
+#include "../nfpcore/nfp_cpp.h"
+#include "../nfpcore/nfp_nffw.h"
+#include "../nfpcore/nfp_nsp.h"
+#include "../nfp_app.h"
+#include "../nfp_main.h"
+#include "../nfp_net.h"
+#include "../nfp_port.h"
+#include "fw.h"
+#include "main.h"
+
+const struct rhashtable_params nfp_bpf_maps_neutral_params = {
+	.nelem_hint		= 4,
+	.key_len		= sizeof_field(struct bpf_map, id),
+	.key_offset		= offsetof(struct nfp_bpf_neutral_map, map_id),
+	.head_offset		= offsetof(struct nfp_bpf_neutral_map, l),
+	.automatic_shrinking	= true,
+};
+
+static bool nfp_net_ebpf_capable(struct nfp_net *nn)
+{
+#ifdef __LITTLE_ENDIAN
+	struct nfp_app_bpf *bpf = nn->app->priv;
+
+	return nn->cap & NFP_NET_CFG_CTRL_BPF &&
+	       bpf->abi_version &&
+	       nn_readb(nn, NFP_NET_CFG_BPF_ABI) == bpf->abi_version;
+#else
+	return false;
+#endif
+}
+
+static int
+nfp_bpf_xdp_offload(struct nfp_app *app, struct nfp_net *nn,
+		    struct bpf_prog *prog, struct netlink_ext_ack *extack)
+{
+	bool running, xdp_running;
+
+	if (!nfp_net_ebpf_capable(nn))
+		return -EINVAL;
+
+	running = nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF;
+	xdp_running = running && nn->xdp_hw.prog;
+
+	if (!prog && !xdp_running)
+		return 0;
+	if (prog && running && !xdp_running)
+		return -EBUSY;
+
+	return nfp_net_bpf_offload(nn, prog, running, extack);
+}
+
+static const char *nfp_bpf_extra_cap(struct nfp_app *app, struct nfp_net *nn)
+{
+	return nfp_net_ebpf_capable(nn) ? "BPF" : "";
+}
+
+static int
+nfp_bpf_vnic_alloc(struct nfp_app *app, struct nfp_net *nn, unsigned int id)
+{
+	struct nfp_pf *pf = app->pf;
+	struct nfp_bpf_vnic *bv;
+	int err;
+
+	if (!pf->eth_tbl) {
+		nfp_err(pf->cpp, "No ETH table\n");
+		return -EINVAL;
+	}
+	if (pf->max_data_vnics != pf->eth_tbl->count) {
+		nfp_err(pf->cpp, "ETH entries don't match vNICs (%d vs %d)\n",
+			pf->max_data_vnics, pf->eth_tbl->count);
+		return -EINVAL;
+	}
+
+	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);
+	return err;
+}
+
+static void nfp_bpf_vnic_free(struct nfp_app *app, struct nfp_net *nn)
+{
+	struct nfp_bpf_vnic *bv = nn->app_priv;
+
+	WARN_ON(bv->tc_prog);
+	kfree(bv);
+}
+
+static int nfp_bpf_setup_tc_block_cb(enum tc_setup_type type,
+				     void *type_data, void *cb_priv)
+{
+	struct tc_cls_bpf_offload *cls_bpf = type_data;
+	struct nfp_net *nn = cb_priv;
+	struct bpf_prog *oldprog;
+	struct nfp_bpf_vnic *bv;
+	int err;
+
+	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)) {
+		NL_SET_ERR_MSG_MOD(cls_bpf->common.extack,
+				   "only direct action with no legacy actions supported");
+		return -EOPNOTSUPP;
+	}
+
+	if (cls_bpf->command != TC_CLSBPF_OFFLOAD)
+		return -EOPNOTSUPP;
+
+	bv = nn->app_priv;
+	oldprog = cls_bpf->oldprog;
+
+	/* Don't remove if oldprog doesn't match driver's state */
+	if (bv->tc_prog != oldprog) {
+		oldprog = NULL;
+		if (!cls_bpf->prog)
+			return 0;
+	}
+
+	err = nfp_net_bpf_offload(nn, cls_bpf->prog, oldprog,
+				  cls_bpf->common.extack);
+	if (err)
+		return err;
+
+	bv->tc_prog = cls_bpf->prog;
+	nn->port->tc_offload_cnt = !!bv->tc_prog;
+	return 0;
+}
+
+static LIST_HEAD(nfp_bpf_block_cb_list);
+
+static int nfp_bpf_setup_tc(struct nfp_app *app, struct net_device *netdev,
+			    enum tc_setup_type type, void *type_data)
+{
+	struct nfp_net *nn = netdev_priv(netdev);
+
+	switch (type) {
+	case TC_SETUP_BLOCK:
+		return flow_block_cb_setup_simple(type_data,
+						  &nfp_bpf_block_cb_list,
+						  nfp_bpf_setup_tc_block_cb,
+						  nn, nn, true);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int
+nfp_bpf_check_mtu(struct nfp_app *app, struct net_device *netdev, int new_mtu)
+{
+	struct nfp_net *nn = netdev_priv(netdev);
+	struct nfp_bpf_vnic *bv;
+	struct bpf_prog *prog;
+
+	if (~nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF)
+		return 0;
+
+	if (nn->xdp_hw.prog) {
+		prog = nn->xdp_hw.prog;
+	} else {
+		bv = nn->app_priv;
+		prog = bv->tc_prog;
+	}
+
+	if (nfp_bpf_offload_check_mtu(nn, prog, new_mtu)) {
+		nn_info(nn, "BPF offload active, potential packet access beyond hardware packet boundary");
+		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;
+	case BPF_FUNC_map_update_elem:
+		bpf->helpers.map_update = readl(&cap->func_addr);
+		break;
+	case BPF_FUNC_map_delete_elem:
+		bpf->helpers.map_delete = readl(&cap->func_addr);
+		break;
+	case BPF_FUNC_perf_event_output:
+		bpf->helpers.perf_event_output = 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_cap_random(struct nfp_app_bpf *bpf, void __iomem *value,
+			 u32 length)
+{
+	bpf->pseudo_random = true;
+	return 0;
+}
+
+static int
+nfp_bpf_parse_cap_qsel(struct nfp_app_bpf *bpf, void __iomem *value, u32 length)
+{
+	bpf->queue_select = true;
+	return 0;
+}
+
+static int
+nfp_bpf_parse_cap_adjust_tail(struct nfp_app_bpf *bpf, void __iomem *value,
+			      u32 length)
+{
+	bpf->adjust_tail = true;
+	return 0;
+}
+
+static int
+nfp_bpf_parse_cap_cmsg_multi_ent(struct nfp_app_bpf *bpf, void __iomem *value,
+				 u32 length)
+{
+	bpf->cmsg_multi_ent = true;
+	return 0;
+}
+
+static int
+nfp_bpf_parse_cap_abi_version(struct nfp_app_bpf *bpf, void __iomem *value,
+			      u32 length)
+{
+	if (length < 4) {
+		nfp_err(bpf->app->cpp, "truncated ABI version TLV: %d\n",
+			length);
+		return -EINVAL;
+	}
+
+	bpf->abi_version = readl(value);
+	if (bpf->abi_version < 2 || bpf->abi_version > 3) {
+		nfp_warn(bpf->app->cpp, "unsupported BPF ABI version: %d\n",
+			 bpf->abi_version);
+		bpf->abi_version = 0;
+	}
+
+	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;
+		case NFP_BPF_CAP_TYPE_RANDOM:
+			if (nfp_bpf_parse_cap_random(app->priv, value, length))
+				goto err_release_free;
+			break;
+		case NFP_BPF_CAP_TYPE_QUEUE_SELECT:
+			if (nfp_bpf_parse_cap_qsel(app->priv, value, length))
+				goto err_release_free;
+			break;
+		case NFP_BPF_CAP_TYPE_ADJUST_TAIL:
+			if (nfp_bpf_parse_cap_adjust_tail(app->priv, value,
+							  length))
+				goto err_release_free;
+			break;
+		case NFP_BPF_CAP_TYPE_ABI_VERSION:
+			if (nfp_bpf_parse_cap_abi_version(app->priv, value,
+							  length))
+				goto err_release_free;
+			break;
+		case NFP_BPF_CAP_TYPE_CMSG_MULTI_ENT:
+			if (nfp_bpf_parse_cap_cmsg_multi_ent(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 void nfp_bpf_init_capabilities(struct nfp_app_bpf *bpf)
+{
+	bpf->abi_version = 2; /* Original BPF ABI version */
+}
+
+static int nfp_bpf_ndo_init(struct nfp_app *app, struct net_device *netdev)
+{
+	struct nfp_app_bpf *bpf = app->priv;
+
+	return bpf_offload_dev_netdev_register(bpf->bpf_dev, netdev);
+}
+
+static void nfp_bpf_ndo_uninit(struct nfp_app *app, struct net_device *netdev)
+{
+	struct nfp_app_bpf *bpf = app->priv;
+
+	bpf_offload_dev_netdev_unregister(bpf->bpf_dev, netdev);
+}
+
+static int nfp_bpf_start(struct nfp_app *app)
+{
+	struct nfp_app_bpf *bpf = app->priv;
+
+	if (app->ctrl->dp.mtu < nfp_bpf_ctrl_cmsg_min_mtu(bpf)) {
+		nfp_err(bpf->app->cpp,
+			"ctrl channel MTU below min required %u < %u\n",
+			app->ctrl->dp.mtu, nfp_bpf_ctrl_cmsg_min_mtu(bpf));
+		return -EINVAL;
+	}
+
+	if (bpf->cmsg_multi_ent)
+		bpf->cmsg_cache_cnt = nfp_bpf_ctrl_cmsg_cache_cnt(bpf);
+	else
+		bpf->cmsg_cache_cnt = 1;
+
+	return 0;
+}
+
+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;
+
+	INIT_LIST_HEAD(&bpf->map_list);
+
+	err = nfp_ccm_init(&bpf->ccm, app);
+	if (err)
+		goto err_free_bpf;
+
+	err = rhashtable_init(&bpf->maps_neutral, &nfp_bpf_maps_neutral_params);
+	if (err)
+		goto err_clean_ccm;
+
+	nfp_bpf_init_capabilities(bpf);
+
+	err = nfp_bpf_parse_capabilities(app);
+	if (err)
+		goto err_free_neutral_maps;
+
+	if (bpf->abi_version < 3) {
+		bpf->cmsg_key_sz = CMSG_MAP_KEY_LW * 4;
+		bpf->cmsg_val_sz = CMSG_MAP_VALUE_LW * 4;
+	} else {
+		bpf->cmsg_key_sz = bpf->maps.max_key_sz;
+		bpf->cmsg_val_sz = bpf->maps.max_val_sz;
+		app->ctrl_mtu = nfp_bpf_ctrl_cmsg_mtu(bpf);
+	}
+
+	bpf->bpf_dev = bpf_offload_dev_create(&nfp_bpf_dev_ops, bpf);
+	err = PTR_ERR_OR_ZERO(bpf->bpf_dev);
+	if (err)
+		goto err_free_neutral_maps;
+
+	return 0;
+
+err_free_neutral_maps:
+	rhashtable_destroy(&bpf->maps_neutral);
+err_clean_ccm:
+	nfp_ccm_clean(&bpf->ccm);
+err_free_bpf:
+	kfree(bpf);
+	return err;
+}
+
+static void nfp_bpf_clean(struct nfp_app *app)
+{
+	struct nfp_app_bpf *bpf = app->priv;
+
+	bpf_offload_dev_destroy(bpf->bpf_dev);
+	nfp_ccm_clean(&bpf->ccm);
+	WARN_ON(!list_empty(&bpf->map_list));
+	WARN_ON(bpf->maps_in_use || bpf->map_elems_in_use);
+	rhashtable_free_and_destroy(&bpf->maps_neutral,
+				    nfp_check_rhashtable_empty, NULL);
+	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,
+	.start		= nfp_bpf_start,
+
+	.check_mtu	= nfp_bpf_check_mtu,
+
+	.extra_cap	= nfp_bpf_extra_cap,
+
+	.ndo_init	= nfp_bpf_ndo_init,
+	.ndo_uninit	= nfp_bpf_ndo_uninit,
+
+	.vnic_alloc	= nfp_bpf_vnic_alloc,
+	.vnic_free	= nfp_bpf_vnic_free,
+
+	.ctrl_msg_rx	= nfp_bpf_ctrl_msg_rx,
+	.ctrl_msg_rx_raw	= nfp_bpf_ctrl_msg_rx_raw,
+
+	.setup_tc	= nfp_bpf_setup_tc,
+	.bpf		= nfp_ndo_bpf,
+	.xdp_offload	= nfp_bpf_xdp_offload,
+};