From: Eric Dumazet Date: Thu, 30 Apr 2026 02:36:28 +0000 (+0000) Subject: net/sched: speedup tc_dump_qdisc() when tcm_ifindex is provided X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=6f63b829632cbb4e7c4b6c55c79f5bb6652c06a8;p=thirdparty%2Fkernel%2Flinux.git net/sched: speedup tc_dump_qdisc() when tcm_ifindex is provided There is no point dumping qdiscs for all devices when user space wants them for a single device: tc -s -d qdisc show dev eth1 Signed-off-by: Eric Dumazet Link: https://patch.msgid.link/20260430023628.3216283-5-edumazet@google.com Signed-off-by: Jakub Kicinski --- diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index cf3d01dd6b26..dd0edc9bd461 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -1884,6 +1884,7 @@ static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) unsigned long ifindex; int q_idx; } *ctx = (void *)cb->ctx; + const struct tcmsg *tcm; struct net_device *dev; int s_q_idx, q_idx; int err; @@ -1894,6 +1895,9 @@ static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) rtm_tca_policy, cb->extack); if (err < 0) return err; + tcm = nlmsg_data(nlh); + if (tcm->tcm_ifindex && !ctx->ifindex) + ctx->ifindex = tcm->tcm_ifindex; s_q_idx = ctx->q_idx; @@ -1901,6 +1905,9 @@ static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) struct netdev_queue *dev_queue; struct Qdisc *q; + if (tcm->tcm_ifindex && ctx->ifindex != tcm->tcm_ifindex) + break; + q_idx = 0; netdev_lock_ops(dev);