netdev - [PATCH iproute2 2/2] bridge: Remove vlan listing from `bridge link`

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Date:   Mon, 14 Feb 2022 10:44:46 +0900
From:   Benjamin Poirier <bpoirier@...dia.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
CC:     <netdev@...r.kernel.org>
Subject: [PATCH iproute2 2/2] bridge: Remove vlan listing from `bridge link`

vlan listing from `bridge link -d` was broken by commit f32e4977dcb0 ("bridge:
add json support for link command"). print_vlan_info() expects to be passed a
IFLA_AF_SPEC attribute (as is done in print_vlan()) but that commit changed
the call in link.c to pass a IFLA_BRIDGE_VLAN_INFO attribute instead. As a
result, a struct bridge_vlan_info is mistakenly parsed as a struct rtattr and
print_vlan_info() usually exits early in this callpath.

The output style of print_vlan_info() (one line per vlan) is different from
the output style of `bridge link` (multiple attributes per line). The json
output is also unsuitable for `bridge link`. Since vlan listing is available
from `bridge vlan`, remove it from `bridge link` instead of trying to change
print_vlan_info().

Note that previously, bridge master devices would be included in the output
when specifying '-d' (and only in that case) but they are no longer
included because there is no detailed information to show for master
devices if we are not printing a vlan listing:
$ bridge link
4: vxlan0: <BROADCAST,MULTICAST> mtu 1500 master br0 state disabled priority 32 cost 100
$ bridge -d link
3: br0: <BROADCAST,MULTICAST> mtu 1500 master br0
4: vxlan0: <BROADCAST,MULTICAST> mtu 1500 master br0 state disabled priority 32 cost 100
    hairpin off guard off root_block off fastleave off learning on flood on mcast_flood on mcast_to_unicast off neigh_suppress off vlan_tunnel on isolated off
$ ./bridge/bridge -d link
4: vxlan0: <BROADCAST,MULTICAST> mtu 1500 master br0 state disabled priority 32 cost 100
    hairpin off guard off root_block off fastleave off learning on flood on mcast_flood on mcast_to_unicast off neigh_suppress off vlan_tunnel on isolated off

Fixes: f32e4977dcb0 ("bridge: add json support for link command")
Signed-off-by: Benjamin Poirier <bpoirier@...dia.com>
---
 bridge/link.c | 22 +++-------------------
 1 file changed, 3 insertions(+), 19 deletions(-)

diff --git a/bridge/link.c b/bridge/link.c
index b6292984..bc7837a9 100644
--- a/bridge/link.c
+++ b/bridge/link.c
@@ -192,12 +192,6 @@ static void print_af_spec(struct rtattr *attr, int ifindex)
 
 	if (aftb[IFLA_BRIDGE_MODE])
 		print_hwmode(rta_getattr_u16(aftb[IFLA_BRIDGE_MODE]));
-
-	if (!show_details)
-		return;
-
-	if (aftb[IFLA_BRIDGE_VLAN_INFO])
-		print_vlan_info(aftb[IFLA_BRIDGE_VLAN_INFO], ifindex);
 }
 
 int print_linkinfo(struct nlmsghdr *n, void *arg)
@@ -538,19 +532,9 @@ static int brlink_show(int argc, char **argv)
 			return nodev(filter_dev);
 	}
 
-	if (show_details) {
-		if (rtnl_linkdump_req_filter(&rth, PF_BRIDGE,
-					     (compress_vlans ?
-					      RTEXT_FILTER_BRVLAN_COMPRESSED :
-					      RTEXT_FILTER_BRVLAN)) < 0) {
-			perror("Cannot send dump request");
-			exit(1);
-		}
-	} else {
-		if (rtnl_linkdump_req(&rth, PF_BRIDGE) < 0) {
-			perror("Cannot send dump request");
-			exit(1);
-		}
+	if (rtnl_linkdump_req(&rth, PF_BRIDGE) < 0) {
+		perror("Cannot send dump request");
+		exit(1);
 	}
 
 	new_json_obj(json);
-- 
2.34.1