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Miller" , Eric Dumazet , Paolo Abeni , David Wei Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, Breno Leitao , Andrew Lunn X-Mailer: b4 0.15-dev-dd21f X-Developer-Signature: v=1; a=openpgp-sha256; l=1786; i=leitao@debian.org; h=from:subject:message-id; bh=VJgMPLn1l+slzARbgJQjau6sONTpo4VaJ2HYwxfoqcs=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBo7hW3j+Ib/nYC8U/xj494rOJsEYPBywCIJFrS+ CYsrtcb5OyJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCaO4VtwAKCRA1o5Of/Hh3 bWSzEACsWRp0dx8Hba+M++EAUB/uUIZaaFAnYLaTeCSdrbCWdIKFSONIW+T3eqfEyEj2AYZ15MY K2Ebz1MWYoyywEl7MQEX/YnALn3cz/EeFeqTKwyZKuA6Spp/1Lgn3uGlagPiRL09sUT1b23EFLr rVizn3VYsK6NVgPDTjdebOGDBwOBQROZtDyC7aLIXu3xbvKzZ7b0Q6S4vyLhVcw7DXy2SHCTXVj rPKYZaTZxLC3Svjf2m4qubZat6Moyfllt44L6pX9EiYK/m1QmDjZcdzePfVYgHaKOFaDa9wb8WI 6fsNryZyWRiPjcKEKdLuvs7ouVw1gtVO84tL3tye9H8gb6CDnKy3Yfeg7FXAQTIe6XEzh0FgvLa 3laXsdZL1+2hRgUcOLx6P1YgrBAPlPhp71Xefwe+w0tzKOrPAi91qmp2yyislz+2jWj+wM1Fat8 29ZQgGzqx94W56310sYDHknxUhviOoAHCF79Ef8f8hbu2y971DiYIDTMHivK7Dwov2G1l5a0di2 Nm5rY1PnD4NzSWSR9SQ0jlQMrKXNwdv42rn1YXa7ZDyX8b6m3rRxX8HHzTvgUeln4/fghC5D8u5 IdUJgWdQICOzwAVJTTFLZn+hANGi4vFiCFyg9+mOfjSZQ7jjB/weVIHS2Z2yyMHLuiz4TFs7WKt LY0xi2yiHuwZBEQ== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D Bringing a linked netdevsim device down and then up causes communication failure because both interfaces lack carrier. Basically a ifdown/ifup on the interface make the link broken. Commit 3762ec05a9fbda ("netdevsim: add NAPI support") added supported for NAPI, calling netif_carrier_off() in nsim_stop(). This patch re-enables the carrier symmetrically on nsim_open(), in case the device is linked and the peer is up. Signed-off-by: Breno Leitao Fixes: 3762ec05a9fbda ("netdevsim: add NAPI support") Reviewed-by: Andrew Lunn --- Changes in v2: - Reword the commit message to reference the symmetry between nsim_open() and nsim_stop() in regarding to carrier. (Andrew Lunn) - Link to v1: https://lore.kernel.org/r/20251013-netdevsim_fix-v1-1-357b265= dd9d0@debian.org --- drivers/net/netdevsim/netdev.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c index ebc3833e95b44..fa1d97885caaf 100644 --- a/drivers/net/netdevsim/netdev.c +++ b/drivers/net/netdevsim/netdev.c @@ -545,6 +545,7 @@ static void nsim_enable_napi(struct netdevsim *ns) static int nsim_open(struct net_device *dev) { struct netdevsim *ns =3D netdev_priv(dev); + struct netdevsim *peer; int err; =20 netdev_assert_locked(dev); @@ -555,6 +556,12 @@ static int nsim_open(struct net_device *dev) =20 nsim_enable_napi(ns); =20 + peer =3D rtnl_dereference(ns->peer); + if (peer && netif_running(peer->netdev)) { + netif_carrier_on(dev); + netif_carrier_on(peer->netdev); + } + return 0; } =20 --- base-commit: 0b4b77eff5f8cd9be062783a1c1e198d46d0a753 change-id: 20251013-netdevsim_fix-b9a8a5064f8f Best regards, -- =20 Breno Leitao