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Message-ID: <CAMDZJNVgL_arLn=8oP=Nr=m7o6dYS3GjNe7AoMPpGKxX2qKbcA@mail.gmail.com>
Date: Mon, 4 Mar 2019 16:26:08 +0800
From: Tonghao Zhang <xiangxia.m.yue@...il.com>
To: Roi Dayan <roid@...lanox.com>
Cc: Saeed Mahameed <saeedm@...lanox.com>,
"gerlitz.or@...il.com" <gerlitz.or@...il.com>,
"davem@...emloft.net" <davem@...emloft.net>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Eli Cohen <eli@...lanox.com>
Subject: Re: [PATCH 1/2] net/mlx5: Avoid panic when setting vport mac, getting
vport config
On Mon, Mar 4, 2019 at 3:06 PM Roi Dayan <roid@...lanox.com> wrote:
>
>
>
> On 04/03/2019 03:04, Tonghao Zhang wrote:
> > On Sun, Mar 3, 2019 at 8:42 PM Roi Dayan <roid@...lanox.com> wrote:
> >>
> >>
> >>
> >> On 03/03/2019 11:56, xiangxia.m.yue@...il.com wrote:
> >>> From: Tonghao Zhang <xiangxia.m.yue@...il.com>
> >>>
> >>> If we try to set VFs mac address on a VF (not PF) net device,
> >>> the kernel will be crash. The commands are show as below:
> >>>
> >>> $ echo 2 > /sys/class/net/$MLX_PF0/device/sriov_numvfs
> >>> $ ip link set $MLX_VF0 vf 0 mac 00:11:22:33:44:00
> >>>
> >>> [exception RIP: mlx5_eswitch_set_vport_mac+41]
> >>> [ffffb8b7079e3688] do_setlink at ffffffff8f67f85b
> >>> [ffffb8b7079e37a8] __rtnl_newlink at ffffffff8f683778
> >>> [ffffb8b7079e3b68] rtnl_newlink at ffffffff8f683a63
> >>> [ffffb8b7079e3b90] rtnetlink_rcv_msg at ffffffff8f67d812
> >>> [ffffb8b7079e3c10] netlink_rcv_skb at ffffffff8f6b88ab
> >>> [ffffb8b7079e3c60] netlink_unicast at ffffffff8f6b808f
> >>> [ffffb8b7079e3ca0] netlink_sendmsg at ffffffff8f6b8412
> >>> [ffffb8b7079e3d18] sock_sendmsg at ffffffff8f6452f6
> >>> [ffffb8b7079e3d30] ___sys_sendmsg at ffffffff8f645860
> >>> [ffffb8b7079e3eb0] __sys_sendmsg at ffffffff8f647a38
> >>> [ffffb8b7079e3f38] do_syscall_64 at ffffffff8f00401b
> >>> [ffffb8b7079e3f50] entry_SYSCALL_64_after_hwframe at ffffffff8f80008c
> >>>
> >>> and
> >>>
> >>> [exception RIP: mlx5_eswitch_get_vport_config+12]
> >>> [ffffa70607e57678] mlx5e_get_vf_config at ffffffffc03c7f8f [mlx5_core]
> >>> [ffffa70607e57688] do_setlink at ffffffffbc67fa59
> >>> [ffffa70607e577a8] __rtnl_newlink at ffffffffbc683778
> >>> [ffffa70607e57b68] rtnl_newlink at ffffffffbc683a63
> >>> [ffffa70607e57b90] rtnetlink_rcv_msg at ffffffffbc67d812
> >>> [ffffa70607e57c10] netlink_rcv_skb at ffffffffbc6b88ab
> >>> [ffffa70607e57c60] netlink_unicast at ffffffffbc6b808f
> >>> [ffffa70607e57ca0] netlink_sendmsg at ffffffffbc6b8412
> >>> [ffffa70607e57d18] sock_sendmsg at ffffffffbc6452f6
> >>> [ffffa70607e57d30] ___sys_sendmsg at ffffffffbc645860
> >>> [ffffa70607e57eb0] __sys_sendmsg at ffffffffbc647a38
> >>> [ffffa70607e57f38] do_syscall_64 at ffffffffbc00401b
> >>> [ffffa70607e57f50] entry_SYSCALL_64_after_hwframe at ffffffffbc80008c
> >>>
> >>> Fixes: a8d70a054a718 ("net/mlx5: E-Switch, Disallow vlan/spoofcheck setup if not being esw manager")
> >>> Cc: Eli Cohen <eli@...lanox.com>
> >>> Signed-off-by: Tonghao Zhang <xiangxia.m.yue@...il.com>
> >>> ---
> >>> drivers/net/ethernet/mellanox/mlx5/core/eswitch.c | 6 ++++++
> >>> 1 file changed, 6 insertions(+)
> >>>
> >>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
> >>> index 6cb9710..774edc9 100644
> >>> --- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
> >>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
> >>> @@ -1871,6 +1871,9 @@ int mlx5_eswitch_set_vport_mac(struct mlx5_eswitch *esw,
> >>> u64 node_guid;
> >>> int err = 0;
> >>>
> >>> + if (!ESW_ALLOWED(esw))
> >>> + return -EPERM;
> >>> +
> >>
> >> this will introduce a bug with smart nic.
> >> from the commit in the fixes line, in smart nic the PF
> >> is not an esw manager so it will block changing vf mac
> >> with the pf. the fix should be checking if esw is null first.
> > Thanks for your reply, I don't get the smart nic card and can't test
> > it. So to fix this bug,
> > we only check the esw is null right ?
>
> correct. in smart nic we have PF and ECPF. PF is vport manager but not
> esw manager and ECPF is the esw manager.
> We set vf mac through the pf so the condition here should only be
> vport group manager.
pretty good and v2 will be sent
>
> >
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
> > b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
> > index 6cb9710..dc332ba 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
> > @@ -1871,6 +1871,9 @@ int mlx5_eswitch_set_vport_mac(struct mlx5_eswitch *esw,
> > u64 node_guid;
> > int err = 0;
> >
> > + if (!esw)
> > + return -EPERM;
> > +
> > if (!MLX5_CAP_GEN(esw->dev, vport_group_manager))
> > return -EPERM;
>
> maybe just add the condition to the same if.
> if (!esw || !MLX5_CAP_GEN(esw->dev, vport_group_manager))
> return -EPERM;
>
>
> > if (!LEGAL_VPORT(esw, vport) || is_multicast_ether_addr(mac))
> > @@ -1945,6 +1948,9 @@ int mlx5_eswitch_get_vport_config(struct
> > mlx5_eswitch *esw,
> > {
> > struct mlx5_vport *evport;
> >
> > + if (!esw)
> > + return -EPERM;
> > +
> > if (!MLX5_CAP_GEN(esw->dev, vport_group_manager))
> > return -EPERM;
> > if (!LEGAL_VPORT(esw, vport))
> >
> >>
> >>> if (!MLX5_CAP_GEN(esw->dev, vport_group_manager))
> >>> return -EPERM;
> >>> if (!LEGAL_VPORT(esw, vport) || is_multicast_ether_addr(mac))
> >>> @@ -1945,6 +1948,9 @@ int mlx5_eswitch_get_vport_config(struct mlx5_eswitch *esw,
> >>> {
> >>> struct mlx5_vport *evport;
> >>>
> >>> + if (!ESW_ALLOWED(esw))
> >>> + return -EPERM;
> >>> +
> >>> if (!MLX5_CAP_GEN(esw->dev, vport_group_manager))
> >>> return -EPERM;
> >>> if (!LEGAL_VPORT(esw, vport))
> >>>
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