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Miller" , Eric Dumazet , Paolo Abeni , Willem de Bruijn Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org X-Mailer: b4 0.13.0 nsim_do_psp() handles both tx and rx psp processing in the sending device's nsim_start_xmit() path. The existing code has a logical bug, where we erroneously increment rx_bytes and rx_packets on the sending devices stats, instead of the peer device. Additionally, compute psp_len after psp_dev_encapsulate() and before psp_dev_rcv(), which modifies the header region of the skb. The existing calculation was actually correct, because psp_dev_rcv() leaves skb_inner_transport_header pointing at the tcp header, but this is fragile and confusing as there is no actual inner transport header after psp_dev_rcv has removed udp encapsulation. Fixes: 178f0763c5f3 ("netdevsim: implement psp device stats") Assisted-by: Codex:gpt-5.5 Signed-off-by: Daniel Zahka --- drivers/net/netdevsim/psp.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/drivers/net/netdevsim/psp.c b/drivers/net/netdevsim/psp.c index 92a2ed770a36..5ff91da24539 100644 --- a/drivers/net/netdevsim/psp.c +++ b/drivers/net/netdevsim/psp.c @@ -22,6 +22,7 @@ nsim_do_psp(struct sk_buff *skb, struct netdevsim *ns, struct psp_dev *peer_psd; struct psp_assoc *pas; struct net *net; + int psp_len; void **ptr; rcu_read_lock(); @@ -48,6 +49,12 @@ nsim_do_psp(struct sk_buff *skb, struct netdevsim *ns, goto out_unlock; } + psp_len = skb->len - skb_inner_transport_offset(skb); + u64_stats_update_begin(&ns->psp.syncp); + u64_stats_inc(&ns->psp.tx_packets); + u64_stats_add(&ns->psp.tx_bytes, psp_len); + u64_stats_update_end(&ns->psp.syncp); + /* Now pretend we just received this frame */ peer_psd = rcu_dereference(peer_ns->psp.dev); if (peer_psd && peer_psd->config.versions & (1 << pas->version)) { @@ -72,14 +79,10 @@ nsim_do_psp(struct sk_buff *skb, struct netdevsim *ns, refcount_inc(&(*psp_ext)->refcnt); skb->decrypted = 1; - u64_stats_update_begin(&ns->psp.syncp); - u64_stats_inc(&ns->psp.tx_packets); - u64_stats_inc(&ns->psp.rx_packets); - u64_stats_add(&ns->psp.tx_bytes, - skb->len - skb_inner_transport_offset(skb)); - u64_stats_add(&ns->psp.rx_bytes, - skb->len - skb_inner_transport_offset(skb)); - u64_stats_update_end(&ns->psp.syncp); + u64_stats_update_begin(&peer_ns->psp.syncp); + u64_stats_inc(&peer_ns->psp.rx_packets); + u64_stats_add(&peer_ns->psp.rx_bytes, psp_len); + u64_stats_update_end(&peer_ns->psp.syncp); } else { struct ipv6hdr *ip6h __maybe_unused; struct iphdr *iph; -- 2.52.0