From 6a9b58d4736908dadbd918c8336b15a328424934 Mon Sep 17 00:00:00 2001
From: Christian Giese <christian@rtbrick.com>
Date: Wed, 21 Jul 2021 16:41:13 +0200
Subject: [PATCH] Minor performance optimisation.

---
 src/bbl_io.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/bbl_io.c b/src/bbl_io.c
index c5a34076..5b30d0f7 100644
--- a/src/bbl_io.c
+++ b/src/bbl_io.c
@@ -35,11 +35,6 @@ bbl_io_packet_mmap_rx_job (timer_s *timer) {
     if (!interface) {
         return;
     }
-    ctx = interface->ctx;
-
-
-    /* Get RX timestamp */
-    clock_gettime(CLOCK_MONOTONIC, &interface->rx_timestamp);
 
     frame_ptr = interface->io.ring_rx + (interface->io.cursor_rx * interface->io.req_rx.tp_frame_size);
     tphdr = (struct tpacket2_hdr*)frame_ptr;
@@ -52,8 +47,14 @@ bbl_io_packet_mmap_rx_job (timer_s *timer) {
             LOG(IO, "Failed to RX poll interface %s", interface->name);
         }
         interface->stats.poll_rx++;
+        return;
     }
 
+    ctx = interface->ctx;
+
+    /* Get RX timestamp */
+    clock_gettime(CLOCK_MONOTONIC, &interface->rx_timestamp);
+
     while ((tphdr->tp_status & TP_STATUS_USER)) {
         eth_start = (uint8_t*)tphdr + tphdr->tp_mac;
         eth_len = tphdr->tp_len;