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[81.108.45.148]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e6f9fbf12sm152399565e9.0.2026.05.10.15.23.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 10 May 2026 15:23:40 -0700 (PDT) From: Prathamesh Deshpande To: Leon Romanovsky , Jason Gunthorpe Cc: Patrisious Haddad , Mark Bloch , Doug Ledford , Haggai Eran , Majd Dibbiny , linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, Prathamesh Deshpande Subject: [PATCH v12 1/2] IB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier Date: Sun, 10 May 2026 23:22:53 +0100 Message-ID: <20260510222258.6654-2-prathameshdeshpande7@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260510222258.6654-1-prathameshdeshpande7@gmail.com> References: <20260510222258.6654-1-prathameshdeshpande7@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" mlx5_ib_alloc_transport_domain() allocates a transport domain and then may fail in mlx5_ib_enable_lb(). In that case, the allocated TD is leaked. Fix this by deallocating the TD when mlx5_ib_enable_lb() returns an error. Also return 0 explicitly in the no-loopback-capability success branch, and move dev->lb.mutex initialization to mlx5_ib_stage_init_init(). Destroy dev->lb.mutex in the matching cleanup path and in init failure paths after the mutex is initialized. Fixes: 146d2f1af324 ("IB/mlx5: Allocate a Transport Domain for each ucontex= t") Signed-off-by: Prathamesh Deshpande --- drivers/infiniband/hw/mlx5/main.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-) diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5= /main.c index e02bfb1479f5..f6d9841c2bcf 100644 --- a/drivers/infiniband/hw/mlx5/main.c +++ b/drivers/infiniband/hw/mlx5/main.c @@ -2068,9 +2068,13 @@ static int mlx5_ib_alloc_transport_domain(struct mlx= 5_ib_dev *dev, u32 *tdn, if ((MLX5_CAP_GEN(dev->mdev, port_type) !=3D MLX5_CAP_PORT_TYPE_ETH) || (!MLX5_CAP_GEN(dev->mdev, disable_local_lb_uc) && !MLX5_CAP_GEN(dev->mdev, disable_local_lb_mc))) - return err; + return 0; + + err =3D mlx5_ib_enable_lb(dev, true, false); + if (err) + mlx5_cmd_dealloc_transport_domain(dev->mdev, *tdn, uid); =20 - return mlx5_ib_enable_lb(dev, true, false); + return err; } =20 static void mlx5_ib_dealloc_transport_domain(struct mlx5_ib_dev *dev, u32 = tdn, @@ -4464,6 +4468,7 @@ static void mlx5_ib_stage_init_cleanup(struct mlx5_ib= _dev *dev) mlx5_ib_cleanup_multiport_master(dev); WARN_ON(!xa_empty(&dev->odp_mkeys)); mutex_destroy(&dev->cap_mask_mutex); + mutex_destroy(&dev->lb.mutex); WARN_ON(!xa_empty(&dev->sig_mrs)); WARN_ON(!bitmap_empty(dev->dm.memic_alloc_pages, MLX5_MAX_MEMIC_PAGES)); mlx5r_macsec_dealloc_gids(dev); @@ -4486,17 +4491,19 @@ static int mlx5_ib_stage_init_init(struct mlx5_ib_d= ev *dev) dev->port[i].roce.last_port_state =3D IB_PORT_DOWN; } =20 + mutex_init(&dev->lb.mutex); + err =3D mlx5r_cmd_query_special_mkeys(dev); if (err) - return err; + goto err_lb_mutex; =20 err =3D mlx5r_macsec_init_gids_and_devlist(dev); if (err) - return err; + goto err_lb_mutex; =20 err =3D mlx5_ib_init_multiport_master(dev); if (err) - goto err; + goto err_gids; =20 err =3D set_has_smi_cap(dev); if (err) @@ -4536,8 +4543,10 @@ static int mlx5_ib_stage_init_init(struct mlx5_ib_de= v *dev) mlx5_ib_data_direct_cleanup(dev); err_mp: mlx5_ib_cleanup_multiport_master(dev); -err: +err_gids: mlx5r_macsec_dealloc_gids(dev); +err_lb_mutex: + mutex_destroy(&dev->lb.mutex); return err; } =20 @@ -4786,11 +4795,6 @@ static int mlx5_ib_stage_caps_init(struct mlx5_ib_de= v *dev) if (err) return err; =20 - if ((MLX5_CAP_GEN(dev->mdev, port_type) =3D=3D MLX5_CAP_PORT_TYPE_ETH) && - (MLX5_CAP_GEN(dev->mdev, disable_local_lb_uc) || - MLX5_CAP_GEN(dev->mdev, disable_local_lb_mc))) - mutex_init(&dev->lb.mutex); - if (MLX5_CAP_GEN_64(dev->mdev, general_obj_types) & MLX5_GENERAL_OBJ_TYPES_CAP_VIRTIO_NET_Q) { err =3D mlx5_ib_init_var_region(dev); --=20 2.43.0 From nobody Sat Jun 13 04:18:53 2026 Received: from mail-wm1-f54.google.com (mail-wm1-f54.google.com [209.85.128.54]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 98485362128 for ; Sun, 10 May 2026 22:23:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.54 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778451826; cv=none; b=jTeU+wl7SqTrv+r45KLzkRw7e4zwQ2ackLmSpuqnnAKSriXO6zud0qikGHrBRRadsDwVuf4zNYdlf0HXNOjXjsKYtT4Va50XR5uFXMk6rTkq6eqdZdEyKxvXPwPNGSedyKmD6IgJlLTIu8BcXheaFVKnVDIW+iuMdT2IUeh/gKo= ARC-Message-Signature: i=1; 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[81.108.45.148]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e6f9fbf12sm152399565e9.0.2026.05.10.15.23.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 10 May 2026 15:23:42 -0700 (PDT) From: Prathamesh Deshpande To: Leon Romanovsky , Jason Gunthorpe Cc: Patrisious Haddad , Mark Bloch , Doug Ledford , Haggai Eran , Majd Dibbiny , linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, Prathamesh Deshpande Subject: [PATCH v12 2/2] IB/mlx5: Fix loopback threshold/accounting in regular path Date: Sun, 10 May 2026 23:22:54 +0100 Message-ID: <20260510222258.6654-3-prathameshdeshpande7@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260510222258.6654-1-prathameshdeshpande7@gmail.com> References: <20260510222258.6654-1-prathameshdeshpande7@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In regular (non-MP) loopback enable/disable paths, threshold logic uses a hardcoded user_td baseline and does not rollback counters when HW enable fails. Use a TD-capability-aware baseline for user_td transitions, and rollback user_td/qps accounting if mlx5_nic_vport_update_local_lb() fails. Per review, keep MP helper behavior unchanged. Fixes: 08aae7860450 ("RDMA/mlx5: Fix vport loopback forcing for MPV device") Signed-off-by: Prathamesh Deshpande --- drivers/infiniband/hw/mlx5/main.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5= /main.c index f6d9841c2bcf..eda578029d28 100644 --- a/drivers/infiniband/hw/mlx5/main.c +++ b/drivers/infiniband/hw/mlx5/main.c @@ -2005,8 +2005,14 @@ static void mlx5_ib_disable_lb_mp(struct mlx5_core_d= ev *master, lb_state->force_enable =3D false; } =20 +static inline u32 mlx5_ib_lb_td_base(struct mlx5_core_dev *mdev) +{ + return MLX5_CAP_GEN(mdev, log_max_transport_domain) ? 1 : 0; +} + int mlx5_ib_enable_lb(struct mlx5_ib_dev *dev, bool td, bool qp) { + u32 td_base =3D mlx5_ib_lb_td_base(dev->mdev); int err =3D 0; =20 if (dev->lb.force_enable) @@ -2018,11 +2024,18 @@ int mlx5_ib_enable_lb(struct mlx5_ib_dev *dev, bool= td, bool qp) if (qp) dev->lb.qps++; =20 - if (dev->lb.user_td =3D=3D 2 || + if (dev->lb.user_td =3D=3D td_base + 1 || dev->lb.qps =3D=3D 1) { if (!dev->lb.enabled) { err =3D mlx5_nic_vport_update_local_lb(dev->mdev, true); - dev->lb.enabled =3D true; + if (err) { + if (td) + dev->lb.user_td--; + if (qp) + dev->lb.qps--; + } else { + dev->lb.enabled =3D true; + } } } =20 @@ -2033,6 +2046,8 @@ int mlx5_ib_enable_lb(struct mlx5_ib_dev *dev, bool t= d, bool qp) =20 void mlx5_ib_disable_lb(struct mlx5_ib_dev *dev, bool td, bool qp) { + u32 td_base =3D mlx5_ib_lb_td_base(dev->mdev); + if (dev->lb.force_enable) return; =20 @@ -2042,7 +2057,7 @@ void mlx5_ib_disable_lb(struct mlx5_ib_dev *dev, bool= td, bool qp) if (qp) dev->lb.qps--; =20 - if (dev->lb.user_td =3D=3D 1 && + if (dev->lb.user_td <=3D td_base && dev->lb.qps =3D=3D 0) { if (dev->lb.enabled) { mlx5_nic_vport_update_local_lb(dev->mdev, false); --=20 2.43.0