Create a dedicated thread to poll psample netlink socket, receive
sampled packet, parse it to sFlow format and send it to sFlow
monitoring host.
Signed-off-by: Chris Mi <c...@nvidia.com>
Reviewed-by: Eli Britstein <el...@nvidia.com>
---
lib/netdev-offload-tc.c | 123 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 123 insertions(+)
diff --git a/lib/netdev-offload-tc.c b/lib/netdev-offload-tc.c
index 9209217de..7706fba64 100644
--- a/lib/netdev-offload-tc.c
+++ b/lib/netdev-offload-tc.c
@@ -19,12 +19,14 @@
#include <errno.h>
#include <linux/if_ether.h>
#include <linux/psample.h>
+#include <poll.h>
#include "dpif.h"
#include "hash.h"
#include "openvswitch/hmap.h"
#include "openvswitch/match.h"
#include "openvswitch/ofpbuf.h"
+#include "openvswitch/poll-loop.h"
#include "openvswitch/thread.h"
#include "openvswitch/types.h"
#include "openvswitch/util.h"
@@ -2324,6 +2326,123 @@ netdev_tc_psample_init(void)
return sock;
}
+struct netdev_tc_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 int
+netdev_tc_psample_from_ofpbuf(struct netdev_tc_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
+netdev_tc_psample_parse_packet(struct netdev_tc_psample *psample,
+ struct dpif_upcall_sflow *dupcall)
+{
+ const struct sgid_node *node;
+
+ dp_packet_use_stub(&dupcall->packet,
+ CONST_CAST(struct nlattr *,
+ nl_attr_get(psample->packet)) - 1,
+ nl_attr_get_size(psample->packet) +
+ sizeof(struct nlattr));
+ dp_packet_set_data(&dupcall->packet,
+ (char *) dp_packet_data(&dupcall->packet) +
+ sizeof(struct nlattr));
+ dp_packet_set_size(&dupcall->packet, nl_attr_get_size(psample->packet));
+
+ node = sgid_find(psample->dp_group_id);
+ dupcall->sflow_attr = &node->sflow;
+ dupcall->iifindex = psample->iifindex;
+
+ return 0;
+}
+
+static int
+netdev_tc_psample_poll(struct dpif_upcall_sflow *dupcall,
+ struct nl_sock *sock)
+{
+ for (;;) {
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
+ struct netdev_tc_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(sock, &buf, NULL, false);
+
+ if (!error) {
+ error = netdev_tc_psample_from_ofpbuf(&psample, &buf);
+ if (!error) {
+ ofpbuf_uninit(&buf);
+ error = netdev_tc_psample_parse_packet(&psample, dupcall);
+ return error;
+ }
+ } else if (error != EAGAIN) {
+ VLOG_WARN_RL(&rl, "%s: error reading or parsing netlink (%s)",
+ __func__, ovs_strerror(error));
+ nl_sock_drain(sock);
+ error = ENOBUFS;
+ }
+
+ ofpbuf_uninit(&buf);
+ if (error) {
+ return error;
+ }
+ }
+}
+
+static void *
+netdev_tc_psample_handler(void *arg)
+{
+ struct nl_sock *sock = CONST_CAST(struct nl_sock *, arg);
+
+ struct dpif_upcall_sflow dupcall;
+ int err;
+
+ while (true) {
+ err = netdev_tc_psample_poll(&dupcall, sock);
+ if (!err) {
+ upcall_cb(&dupcall);
+ }
+ nl_sock_wait(sock, POLLIN);
+ poll_block();
+ }
+
+ return NULL;
+}
+
static int
netdev_tc_init_flow_api(struct netdev *netdev)
{
@@ -2359,6 +2478,10 @@ netdev_tc_init_flow_api(struct netdev *netdev)
probe_multi_mask_per_prio(ifindex);
psample_sock = netdev_tc_psample_init();
+ if (psample_sock) {
+ ovs_thread_create("psample_handler", netdev_tc_psample_handler,
+ psample_sock);
+ }
ovsthread_once_done(&once);
}
--
2.26.2
_______________________________________________
dev mailing list
d...@openvswitch.org
https://mail.openvswitch.org/mailman/listinfo/ovs-dev
