hw/net: improve tracing of eBPF RSS setup

This adds more trace events to key eBPF RSS setup operations, and
also distinguishes events from multiple NIC instances.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

hw/net/trace-events

@@ -394,9 +394,11 @@ virtio_net_announce_notify(void) ""
 virtio_net_announce_timer(int round) "%d"
 virtio_net_handle_announce(int round) "%d"
 virtio_net_post_load_device(void)
-virtio_net_rss_disable(void)
-virtio_net_rss_error(const char *msg, uint32_t value) "%s, value 0x%08x"
-virtio_net_rss_enable(uint32_t p1, uint16_t p2, uint8_t p3) "hashes 0x%x, table of %d, key of %d"
+virtio_net_rss_load(void *nic, size_t nfds, void *fds) "nic=%p nfds=%zu fds=%p"
+virtio_net_rss_attach_ebpf(void *nic, int prog_fd) "nic=%p prog-fd=%d"
+virtio_net_rss_disable(void *nic) "nic=%p"
+virtio_net_rss_error(void *nic, const char *msg, uint32_t value) "nic=%p msg=%s, value 0x%08x"
+virtio_net_rss_enable(void *nic, uint32_t p1, uint16_t p2, uint8_t p3) "nic=%p hashes 0x%x, table of %d, key of %d"
 
 # tulip.c
 tulip_reg_write(uint64_t addr, const char *name, int size, uint64_t val) "addr 0x%02"PRIx64" (%s) size %d value 0x%08"PRIx64

hw/net/virtio-net.c

@@ -1241,6 +1241,7 @@ static bool virtio_net_attach_ebpf_to_backend(NICState *nic, int prog_fd)
         return false;
     }
 
+    trace_virtio_net_rss_attach_ebpf(nic, prog_fd);
     return nc->info->set_steering_ebpf(nc, prog_fd);
 }
 
@@ -1297,12 +1298,13 @@ static void virtio_net_commit_rss_config(VirtIONet *n)
             }
         }
 
-        trace_virtio_net_rss_enable(n->rss_data.hash_types,
+        trace_virtio_net_rss_enable(n,
+                                    n->rss_data.hash_types,
                                     n->rss_data.indirections_len,
                                     sizeof(n->rss_data.key));
     } else {
         virtio_net_detach_ebpf_rss(n);
-        trace_virtio_net_rss_disable();
+        trace_virtio_net_rss_disable(n);
     }
 }
 
@@ -1353,6 +1355,7 @@ static bool virtio_net_load_ebpf(VirtIONet *n, Error **errp)
     bool ret = false;
 
     if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
+        trace_virtio_net_rss_load(n, n->nr_ebpf_rss_fds, n->ebpf_rss_fds);
         if (n->ebpf_rss_fds) {
             ret = virtio_net_load_ebpf_fds(n, errp);
         } else {
@@ -1484,7 +1487,7 @@ static uint16_t virtio_net_handle_rss(VirtIONet *n,
     virtio_net_commit_rss_config(n);
     return queue_pairs;
 error:
-    trace_virtio_net_rss_error(err_msg, err_value);
+    trace_virtio_net_rss_error(n, err_msg, err_value);
     virtio_net_disable_rss(n);
     return 0;
 }