From fd48f071a3d6d51e737e953bb43fe69785cf59a9 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Fri, 3 Jan 2025 10:32:07 -0800 Subject: [PATCH] net: don't dump Tx and uninitialized NAPIs We use NAPI ID as the key for continuing dumps. We also depend on the NAPIs being sorted by ID within the driver list. Tx NAPIs (which don't have an ID assigned) break this expectation, it's not currently possible to dump them reliably. Since Tx NAPIs are relatively rare, and can't be used in doit (GET or SET) hide them from the dump API as well. Fixes: 27f91aaf49b3 ("netdev-genl: Add netlink framework functions for napi") Signed-off-by: Jakub Kicinski Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20250103183207.1216004-1-kuba@kernel.org Signed-off-by: Paolo Abeni --- net/core/netdev-genl.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c index b0772d135efbe..125b660004d38 100644 --- a/net/core/netdev-genl.c +++ b/net/core/netdev-genl.c @@ -176,8 +176,7 @@ netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi, if (!hdr) return -EMSGSIZE; - if (napi->napi_id >= MIN_NAPI_ID && - nla_put_u32(rsp, NETDEV_A_NAPI_ID, napi->napi_id)) + if (nla_put_u32(rsp, NETDEV_A_NAPI_ID, napi->napi_id)) goto nla_put_failure; if (nla_put_u32(rsp, NETDEV_A_NAPI_IFINDEX, napi->dev->ifindex)) @@ -272,6 +271,8 @@ netdev_nl_napi_dump_one(struct net_device *netdev, struct sk_buff *rsp, return err; list_for_each_entry(napi, &netdev->napi_list, dev_list) { + if (napi->napi_id < MIN_NAPI_ID) + continue; if (ctx->napi_id && napi->napi_id >= ctx->napi_id) continue;