Implement dpif-offload API for netlink datapath.
Signed-off-by: Chris Mi <c...@nvidia.com>
Reviewed-by: Eli Britstein <el...@nvidia.com>
---
lib/automake.mk | 1 +
lib/dpif-netlink.c | 2 +-
lib/dpif-offload-netlink.c | 210 ++++++++++++++++++++++++++++++++++++
lib/dpif-offload-provider.h | 12 +++
4 files changed, 224 insertions(+), 1 deletion(-)
create mode 100644 lib/dpif-offload-netlink.c
diff --git a/lib/automake.mk b/lib/automake.mk
index dc865b0ef..daa60c784 100644
--- a/lib/automake.mk
+++ b/lib/automake.mk
@@ -442,6 +442,7 @@ lib_libopenvswitch_la_SOURCES += \
lib/dpif-netlink.h \
lib/dpif-netlink-rtnl.c \
lib/dpif-netlink-rtnl.h \
+ lib/dpif-offload-netlink.c \
lib/if-notifier.c \
lib/netdev-linux.c \
lib/netdev-linux.h \
diff --git a/lib/dpif-netlink.c b/lib/dpif-netlink.c
index 6a7defb95..676934ef1 100644
--- a/lib/dpif-netlink.c
+++ b/lib/dpif-netlink.c
@@ -4037,7 +4037,7 @@ const struct dpif_class dpif_netlink_class = {
NULL, /* bond_add */
NULL, /* bond_del */
NULL, /* bond_stats_get */
- NULL, /* dpif_offlod_api */
+ &dpif_offload_netlink,
};
static int
diff --git a/lib/dpif-offload-netlink.c b/lib/dpif-offload-netlink.c
new file mode 100644
index 000000000..f02a6b0eb
--- /dev/null
+++ b/lib/dpif-offload-netlink.c
@@ -0,0 +1,210 @@
+/*
+ * Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <config.h>
+#include <errno.h>
+#include <linux/psample.h>
+#include <sys/poll.h>
+
+#include "dpif-offload-provider.h"
+#include "netdev-offload.h"
+#include "netlink-protocol.h"
+#include "netlink-socket.h"
+#include "openvswitch/vlog.h"
+
+VLOG_DEFINE_THIS_MODULE(dpif_offload_netlink);
+
+static struct nl_sock *psample_sock;
+static int psample_family;
+
+/* Receive psample netlink message and save the attributes. */
+struct offload_psample {
+ struct nlattr *packet; /* packet data */
+ int dp_group_id; /* mapping id for sFlow offload */
+ int iifindex; /* input ifindex */
+ int group_seq; /* group sequence */
+};
+
+static void
+dpif_offload_netlink_init(void)
+{
+ unsigned int psample_mcgroup;
+ int err;
+
+ if (!netdev_is_flow_api_enabled()) {
+ return;
+ }
+
+ if (psample_sock) {
+ return;
+ }
+
+ err = nl_lookup_genl_family(PSAMPLE_GENL_NAME,
+ &psample_family);
+ if (err) {
+ VLOG_INFO("%s: Generic Netlink family '%s' does not exist. "
+ "Please make sure the kernel module psample is loaded",
+ __func__, PSAMPLE_GENL_NAME);
+ return;
+ }
+
+ err = nl_lookup_genl_mcgroup(PSAMPLE_GENL_NAME,
+ PSAMPLE_NL_MCGRP_SAMPLE_NAME,
+ &psample_mcgroup);
+ if (err) {
+ VLOG_INFO("%s: Failed to join multicast group '%s' for Generic "
+ "Netlink family '%s'", __func__,
+ PSAMPLE_NL_MCGRP_SAMPLE_NAME,
+ PSAMPLE_GENL_NAME);
+ return;
+ }
+
+ err = nl_sock_create(NETLINK_GENERIC, &psample_sock);
+ if (err) {
+ VLOG_INFO("%s: Failed to create psample socket", __func__);
+ return;
+ }
+
+ err = nl_sock_join_mcgroup(psample_sock, psample_mcgroup);
+ if (err) {
+ VLOG_INFO("%s: Failed to join psample mcgroup", __func__);
+ nl_sock_destroy(psample_sock);
+ return;
+ }
+}
+
+static void
+dpif_offload_netlink_uninit(void)
+{
+ if (!netdev_is_flow_api_enabled()) {
+ return;
+ }
+
+ if (!psample_sock) {
+ return;
+ }
+
+ nl_sock_destroy(psample_sock);
+ psample_sock = NULL;
+}
+
+static void
+dpif_offload_netlink_sflow_recv_wait(void)
+{
+ if (psample_sock) {
+ nl_sock_wait(psample_sock, POLLIN);
+ }
+}
+
+static int
+psample_from_ofpbuf(struct offload_psample *psample,
+ const struct ofpbuf *buf)
+{
+ static const struct nl_policy ovs_psample_policy[] = {
+ [PSAMPLE_ATTR_IIFINDEX] = { .type = NL_A_U16 },
+ [PSAMPLE_ATTR_SAMPLE_GROUP] = { .type = NL_A_U32 },
+ [PSAMPLE_ATTR_GROUP_SEQ] = { .type = NL_A_U32 },
+ [PSAMPLE_ATTR_DATA] = { .type = NL_A_UNSPEC },
+ };
+ struct nlattr *a[ARRAY_SIZE(ovs_psample_policy)];
+ struct genlmsghdr *genl;
+ struct nlmsghdr *nlmsg;
+ struct ofpbuf b;
+
+ b = ofpbuf_const_initializer(buf->data, buf->size);
+ nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
+ genl = ofpbuf_try_pull(&b, sizeof *genl);
+ if (!nlmsg || !genl || nlmsg->nlmsg_type != psample_family
+ || !nl_policy_parse(&b, 0, ovs_psample_policy, a,
+ ARRAY_SIZE(ovs_psample_policy))) {
+ return EINVAL;
+ }
+
+ psample->iifindex = nl_attr_get_u16(a[PSAMPLE_ATTR_IIFINDEX]);
+ psample->dp_group_id = nl_attr_get_u32(a[PSAMPLE_ATTR_SAMPLE_GROUP]);
+ psample->group_seq = nl_attr_get_u16(a[PSAMPLE_ATTR_GROUP_SEQ]);
+ psample->packet = a[PSAMPLE_ATTR_DATA];
+
+ return 0;
+}
+
+static int
+psample_parse_packet(struct offload_psample *psample,
+ struct dpif_offload_sflow *sflow)
+{
+ dp_packet_use_stub(&sflow->packet,
+ CONST_CAST(struct nlattr *,
+ nl_attr_get(psample->packet)) - 1,
+ nl_attr_get_size(psample->packet) +
+ sizeof(struct nlattr));
+ dp_packet_set_data(&sflow->packet,
+ (char *) dp_packet_data(&sflow->packet) +
+ sizeof(struct nlattr));
+ dp_packet_set_size(&sflow->packet, nl_attr_get_size(psample->packet));
+
+ sflow->attr = dpif_offload_sflow_attr_find(psample->dp_group_id);
+ if (!sflow->attr) {
+ return ENOENT;
+ }
+ sflow->iifindex = psample->iifindex;
+
+ return 0;
+}
+
+static int
+dpif_offload_netlink_sflow_recv(struct dpif_offload_sflow *sflow)
+{
+ if (!psample_sock) {
+ return ENOENT;
+ }
+
+ for (;;) {
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
+ struct offload_psample psample;
+ uint64_t buf_stub[4096 / 8];
+ struct ofpbuf buf;
+ int error;
+
+ ofpbuf_use_stub(&buf, buf_stub, sizeof buf_stub);
+ error = nl_sock_recv(psample_sock, &buf, NULL, false);
+
+ if (!error) {
+ error = psample_from_ofpbuf(&psample, &buf);
+ if (!error) {
+ ofpbuf_uninit(&buf);
+ error = psample_parse_packet(&psample, sflow);
+ return error;
+ }
+ } else if (error != EAGAIN) {
+ VLOG_WARN_RL(&rl, "%s: error reading or parsing netlink (%s)",
+ __func__, ovs_strerror(error));
+ nl_sock_drain(psample_sock);
+ error = ENOBUFS;
+ }
+
+ ofpbuf_uninit(&buf);
+ if (error) {
+ return error;
+ }
+ }
+}
+
+const struct dpif_offload_api dpif_offload_netlink = {
+ .init = dpif_offload_netlink_init,
+ .uninit = dpif_offload_netlink_uninit,
+ .sflow_recv_wait = dpif_offload_netlink_sflow_recv_wait,
+ .sflow_recv = dpif_offload_netlink_sflow_recv,
+};
diff --git a/lib/dpif-offload-provider.h b/lib/dpif-offload-provider.h
index b765eb9a2..803c79ed2 100644
--- a/lib/dpif-offload-provider.h
+++ b/lib/dpif-offload-provider.h
@@ -17,6 +17,7 @@
#ifndef DPIF_OFFLOAD_PROVIDER_H
#define DPIF_OFFLOAD_PROVIDER_H
+#include "dp-packet.h"
#include "netlink-protocol.h"
#include "openvswitch/packets.h"
#include "openvswitch/types.h"
@@ -38,6 +39,13 @@ struct dpif_sflow_attr {
ovs_u128 ufid; /* flow ufid */
};
+/* Parse the specific dpif message to sFlow. So OVS can process it. */
+struct dpif_offload_sflow {
+ struct dp_packet packet; /* packet data */
+ uint32_t iifindex; /* input ifindex */
+ const struct dpif_sflow_attr *attr;
+};
+
struct dpif_offload_api {
void (*init)(void);
void (*uninit)(void);
@@ -49,4 +57,8 @@ void dpif_offload_sflow_recv_wait(const struct dpif *dpif);
int dpif_offload_sflow_recv(const struct dpif *dpif,
struct dpif_offload_sflow *sflow);
+#ifdef __linux__
+extern const struct dpif_offload_api dpif_offload_netlink;
+#endif
+
#endif /* DPIF_OFFLOAD_PROVIDER_H */
--
2.21.0
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