Re: [dpdk-dev] [PATCH 1/2] net/mlx4: fix crash in dev_info_get in secondary process

[Raslan Darawsheh <rasland@mellanox.com>]

Hi,
> -----Original Message-----
> From: Raslan Darawsheh
> Sent: Sunday, August 4, 2019 9:58 AM
> To: Stephen Hemminger <stephen@networkplumber.org>; Matan Azrad
> <matan@mellanox.com>; Shahaf Shuler <shahafs@mellanox.com>;
> Yongseok Koh <yskoh@mellanox.com>; Slava Ovsiienko
> <viacheslavo@mellanox.com>
> Cc: dev@dpdk.org; sju@paloaltonetworks.com; stable@dpdk.org
> Subject: RE: [dpdk-dev] [PATCH 1/2] net/mlx4: fix crash in dev_info_get in
> secondary process
> 
> Hi Stephen,
> 
> Wrong headline format:
>         net/mlx4: fix crash in dev_info_get in secondary process can you please
> fix it? You shouldn't use the _ in the title format
> 
> Kindest regards,
> Raslan Darawsheh
> 
> > -----Original Message-----
> > From: dev <dev-bounces@dpdk.org> On Behalf Of Stephen Hemminger
> > Sent: Friday, July 12, 2019 11:54 PM
> > To: Matan Azrad <matan@mellanox.com>; Shahaf Shuler
> > <shahafs@mellanox.com>; Yongseok Koh <yskoh@mellanox.com>; Slava
> > Ovsiienko <viacheslavo@mellanox.com>
> > Cc: dev@dpdk.org; sju@paloaltonetworks.com; Stephen Hemminger
> > <stephen@networkplumber.org>; stable@dpdk.org
> > Subject: [dpdk-dev] [PATCH 1/2] net/mlx4: fix crash in dev_info_get in
> > secondary process
> >
> > mlx4_dev_info_get calls mlx4_get_ifname, but mlx4_get_ifname uses
> > priv->ctx which is not a valid pointer in a secondary process. The fix
> > is to cache the value in primary.
> >
> > In the primary process, get and store the interface index of the
> > device so that secondary process can see it.
> >
> > Bugzilla ID:320
> > Fixes: 61cbdd419478 ("net/mlx4: separate device control functions")
> > Cc: stable@dpdk.org
> > Reported-by: Suyang Ju <sju@paloaltonetworks.com>
> > Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> > ---
> >  drivers/net/mlx4/mlx4.c        | 19 +++++++++----------
> >  drivers/net/mlx4/mlx4.h        |  1 +
> >  drivers/net/mlx4/mlx4_ethdev.c |  4 +---
> >  3 files changed, 11 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c index
> > 2e169b0887a7..bab2cadbe519 100644
> > --- a/drivers/net/mlx4/mlx4.c
> > +++ b/drivers/net/mlx4/mlx4.c
> > @@ -763,6 +763,7 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv,
> > struct rte_pci_device *pci_dev)
> >  	};
> >  	unsigned int vf;
> >  	int i;
> > +	char ifname[IF_NAMESIZE];
> >
> >  	(void)pci_drv;
> >  	err = mlx4_init_once();
> > @@ -1002,17 +1003,15 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv,
> > struct rte_pci_device *pci_dev)
> >  		     mac.addr_bytes[4], mac.addr_bytes[5]);
> >  		/* Register MAC address. */
> >  		priv->mac[0] = mac;
> > -#ifndef NDEBUG
> > -		{
> > -			char ifname[IF_NAMESIZE];
> > -
> > -			if (mlx4_get_ifname(priv, &ifname) == 0)
> > -				DEBUG("port %u ifname is \"%s\"",
> > -				      priv->port, ifname);
> > -			else
> > -				DEBUG("port %u ifname is unknown", priv-
> > >port);
> > +
> > +		if (mlx4_get_ifname(priv, &ifname) == 0) {
> > +			DEBUG("port %u ifname is \"%s\"",
> > +			      priv->port, ifname);
> > +			priv->if_index = if_nametoindex(ifname);
> > +		} else {
> > +			DEBUG("port %u ifname is unknown", priv->port);
> >  		}
> > -#endif
> > +
> >  		/* Get actual MTU if possible. */
> >  		mlx4_mtu_get(priv, &priv->mtu);
> >  		DEBUG("port %u MTU is %u", priv->port, priv->mtu); diff --git
> > a/drivers/net/mlx4/mlx4.h b/drivers/net/mlx4/mlx4.h index
> > cd0d637ac2bf..81b529ee8030 100644
> > --- a/drivers/net/mlx4/mlx4.h
> > +++ b/drivers/net/mlx4/mlx4.h
> > @@ -159,6 +159,7 @@ struct mlx4_priv {
> >  	struct ibv_device_attr device_attr; /**< Device properties. */
> >  	struct ibv_pd *pd; /**< Protection Domain. */
> >  	/* Device properties. */
> > +	unsigned int if_index;	/**< Associated network device index */
> >  	uint16_t mtu; /**< Configured MTU. */
> >  	uint8_t port; /**< Physical port number. */
> >  	uint32_t started:1; /**< Device started, flows enabled. */ diff
> > --git a/drivers/net/mlx4/mlx4_ethdev.c
> > b/drivers/net/mlx4/mlx4_ethdev.c index ceef921620a8..5d28c0116d21
> > 100644
> > --- a/drivers/net/mlx4/mlx4_ethdev.c
> > +++ b/drivers/net/mlx4/mlx4_ethdev.c
> > @@ -616,7 +616,6 @@ mlx4_dev_infos_get(struct rte_eth_dev *dev,
> struct
> > rte_eth_dev_info *info)  {
> >  	struct mlx4_priv *priv = dev->data->dev_private;
> >  	unsigned int max;
> > -	char ifname[IF_NAMESIZE];
> >
> >  	/* FIXME: we should ask the device for these values. */
> >  	info->min_rx_bufsize = 32;
> > @@ -637,8 +636,7 @@ mlx4_dev_infos_get(struct rte_eth_dev *dev,
> struct
> > rte_eth_dev_info *info)
> >  	info->rx_queue_offload_capa = mlx4_get_rx_queue_offloads(priv);
> >  	info->rx_offload_capa = (mlx4_get_rx_port_offloads(priv) |
> >  				 info->rx_queue_offload_capa);
> > -	if (mlx4_get_ifname(priv, &ifname) == 0)
> > -		info->if_index = if_nametoindex(ifname);
> > +	info->if_index = priv->if_index;
> >  	info->hash_key_size = MLX4_RSS_HASH_KEY_SIZE;
> >  	info->speed_capa =
> >  			ETH_LINK_SPEED_1G |
> > --
> > 2.20.1


Patch applied to next-net-mlx after fixing wrong headline format,

Kindest regards,
Raslan Darawsheh