From ad6d5d831e6cbbfed9dd84bc370e139b013aecfb Mon Sep 17 00:00:00 2001
From: Vincent Bernat <vincent@bernat.ch>
Date: Tue, 27 Apr 2021 10:45:57 +0200
Subject: [PATCH] priv: ensure Intel E8xx cards can transmit LLDP packets

Fix #444
---
 NEWS                    |  4 ++++
 README.md               |  2 ++
 src/daemon/priv-linux.c | 13 +++++++++++++
 3 files changed, 19 insertions(+)

diff --git a/NEWS b/NEWS
index addd8317..4ae162e7 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,7 @@
+lldpd (1.0.11)
+  * Fix:
+    + Ensure Intel E8xx cards can transmit LLDP packets.
+
 lldpd (1.0.10)
   * Fix:
     + Fix chroot directory creation.
diff --git a/README.md b/README.md
index a13457c7..9bd9f71d 100644
--- a/README.md
+++ b/README.md
@@ -328,6 +328,8 @@ have such a card (with `lspci`) and stop the embedded LLDP daemon:
         echo lldp stop > $f
     done
 
+This may also apply to the `ice` (Intel E8xx cards) driver.
+
 License
 -------
 
diff --git a/src/daemon/priv-linux.c b/src/daemon/priv-linux.c
index 37865235..6840477b 100644
--- a/src/daemon/priv-linux.c
+++ b/src/daemon/priv-linux.c
@@ -38,6 +38,9 @@
 #pragma clang diagnostic pop
 #endif
 
+/* Defined in linux/pkt_sched.h */
+#define TC_PRIO_CONTROL 7
+
 /* Proxy for open */
 int
 priv_open(char *file)
@@ -155,6 +158,16 @@ asroot_iface_init_os(int ifindex, char *name, int *fd)
 		return rc;
 	}
 
+	/* Set priority to TC_PRIO_CONTROL for ice Intel cards. See #444. */
+	int prio = TC_PRIO_CONTROL;
+	if (setsockopt(*fd, SOL_SOCKET, SO_PRIORITY, &prio, sizeof(prio)) < 0) {
+		rc = errno;
+		log_warn("privsep",
+		    "unable to set priority \"control\" to socket for interface %s",
+		    name);
+		return rc;
+	}
+
 #ifdef SO_LOCK_FILTER
 	int lock = 1;
 	if (setsockopt(*fd, SOL_SOCKET, SO_LOCK_FILTER,
-- 
2.39.5