netdev - [PATCH iproute2-next v2 1/2] iplink: print warning for missing VF data

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Date:   Tue, 26 Jan 2021 09:40:53 -0800
From:   Edwin Peer <edwin.peer@...adcom.com>
To:     netdev@...r.kernel.org
Cc:     Edwin Peer <edwin.peer@...adcom.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Andrew Gospodarek <andrew.gospodarek@...adcom.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Michal Kubecek <mkubecek@...e.cz>,
        David Ahern <dsahern@...il.com>
Subject: [PATCH iproute2-next v2 1/2] iplink: print warning for missing VF data

The kernel might truncate VF info in IFLA_VFINFO_LIST. Compare the
expected number of VFs in IFLA_NUM_VF to how many were found in the
list and warn accordingly.

Signed-off-by: Edwin Peer <edwin.peer@...adcom.com>
---
 ip/ipaddress.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index 571346b15cc3..0bbcee2b3bb2 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -922,6 +922,7 @@ int print_linkinfo(struct nlmsghdr *n, void *arg)
 	const char *name;
 	unsigned int m_flag = 0;
 	SPRINT_BUF(b1);
+	bool truncated_vfs = false;
 
 	if (n->nlmsg_type != RTM_NEWLINK && n->nlmsg_type != RTM_DELLINK)
 		return 0;
@@ -1199,15 +1200,18 @@ int print_linkinfo(struct nlmsghdr *n, void *arg)
 
 	if ((do_link || show_details) && tb[IFLA_VFINFO_LIST] && tb[IFLA_NUM_VF]) {
 		struct rtattr *i, *vflist = tb[IFLA_VFINFO_LIST];
-		int rem = RTA_PAYLOAD(vflist);
+		int rem = RTA_PAYLOAD(vflist), count = 0;
 
 		open_json_array(PRINT_JSON, "vfinfo_list");
 		for (i = RTA_DATA(vflist); RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
 			open_json_object(NULL);
 			print_vfinfo(fp, ifi, i);
 			close_json_object();
+			count++;
 		}
 		close_json_array(PRINT_JSON, NULL);
+		if (count != rta_getattr_u32(tb[IFLA_NUM_VF]))
+			truncated_vfs = true;
 	}
 
 	if (tb[IFLA_PROP_LIST]) {
@@ -1228,6 +1232,9 @@ int print_linkinfo(struct nlmsghdr *n, void *arg)
 
 	print_string(PRINT_FP, NULL, "%s", "\n");
 	fflush(fp);
+	/* prettier here if stderr and stdout go to the same place */
+	if (truncated_vfs)
+		fprintf(stderr, "Truncated VF list: %s\n", name);
 	return 1;
 }
 
-- 
2.30.0


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