Re: [dpdk-dev] [PATCH v2 2/2] Revert "net/mlx5: fix master device Netlink socket sharing"

[Yongseok Koh <yskoh@mellanox.com>]

> On Jul 21, 2019, at 7:56 AM, Viacheslav Ovsiienko <viacheslavo@mellanox.com> wrote:
> 
> This reverts commit e28111ac9864af09e826241a915dfff87a9c00ad.
> The netlink requests are replaced by ifindex caching and
> not needed anymore.
> 
> Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
> Fixes: e28111ac9864 ("net/mlx5: fix master device Netlink socket sharing")
> ---

Acked-by: Yongseok Koh <yskoh@mellanox.com>

> drivers/net/mlx5/mlx5.h        |   6 ---
> drivers/net/mlx5/mlx5_ethdev.c | 109 ++---------------------------------------
> 2 files changed, 3 insertions(+), 112 deletions(-)
> 
> diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
> index 1011dcc..3e75961 100644
> --- a/drivers/net/mlx5/mlx5.h
> +++ b/drivers/net/mlx5/mlx5.h
> @@ -518,15 +518,9 @@ struct mlx5_priv {
> /* mlx5_ethdev.c */
> 
> int mlx5_get_ifname(const struct rte_eth_dev *dev, char (*ifname)[IF_NAMESIZE]);
> -int mlx5_get_ifname_base(const struct rte_eth_dev *base,
> -			 const struct rte_eth_dev *dev,
> -			 char (*ifname)[IF_NAMESIZE]);
> int mlx5_get_master_ifname(const char *ibdev_path, char (*ifname)[IF_NAMESIZE]);
> unsigned int mlx5_ifindex(const struct rte_eth_dev *dev);
> int mlx5_ifreq(const struct rte_eth_dev *dev, int req, struct ifreq *ifr);
> -int mlx5_ifreq_base(const struct rte_eth_dev *base,
> -		    const struct rte_eth_dev *dev,
> -		    int req, struct ifreq *ifr);
> int mlx5_get_mtu(struct rte_eth_dev *dev, uint16_t *mtu);
> int mlx5_set_flags(struct rte_eth_dev *dev, unsigned int keep,
> 		   unsigned int flags);
> diff --git a/drivers/net/mlx5/mlx5_ethdev.c b/drivers/net/mlx5/mlx5_ethdev.c
> index dfd9e97..9629cfb 100644
> --- a/drivers/net/mlx5/mlx5_ethdev.c
> +++ b/drivers/net/mlx5/mlx5_ethdev.c
> @@ -240,51 +240,6 @@ struct ethtool_link_settings {
> }
> 
> /**
> - * Get interface name for the specified device, uses the extra base
> - * device resources to perform Netlink requests.
> - *
> - * This is a port representor-aware version of mlx5_get_master_ifname().
> - *
> - * @param[in] base
> - *   Pointer to Ethernet device to use Netlink socket from
> - *   to perfrom requests.
> - * @param[in] dev
> - *   Pointer to Ethernet device.
> - * @param[out] ifname
> - *   Interface name output buffer.
> - *
> - * @return
> - *   0 on success, a negative errno value otherwise and rte_errno is set.
> - */
> -int
> -mlx5_get_ifname_base(const struct rte_eth_dev *base,
> -		     const struct rte_eth_dev *dev,
> -		     char (*ifname)[IF_NAMESIZE])
> -{
> -	struct mlx5_priv *priv = dev->data->dev_private;
> -	struct mlx5_priv *priv_base = base->data->dev_private;
> -	unsigned int ifindex;
> -
> -	assert(priv);
> -	assert(priv->sh);
> -	assert(priv_base);
> -	ifindex = priv_base->nl_socket_rdma >= 0 ?
> -		  mlx5_nl_ifindex(priv_base->nl_socket_rdma,
> -				  priv->sh->ibdev_name,
> -				  priv->ibv_port) : 0;
> -	if (!ifindex) {
> -		if (!priv->representor)
> -			return mlx5_get_master_ifname(priv->sh->ibdev_path,
> -						      ifname);
> -		rte_errno = ENXIO;
> -		return -rte_errno;
> -	}
> -	if (if_indextoname(ifindex, &(*ifname)[0]))
> -		return 0;
> -	rte_errno = errno;
> -	return -rte_errno;
> -}
> -/**
>  * Get the interface index from device name.
>  *
>  * @param[in] dev
> @@ -346,51 +301,6 @@ struct ethtool_link_settings {
> }
> 
> /**
> - * Perform ifreq ioctl() on specified Ethernet device,
> - * ifindex, name and other attributes are requested
> - * on the base device to avoid specified device Netlink
> - * socket sharing (this is not thread-safe).
> - *
> - * @param[in] base
> - *   Pointer to Ethernet device to get dev attributes.
> - * @param[in] dev
> - *   Pointer to Ethernet device to perform ioctl.
> - * @param req
> - *   Request number to pass to ioctl().
> - * @param[out] ifr
> - *   Interface request structure output buffer.
> - *
> - * @return
> - *   0 on success, a negative errno value otherwise and rte_errno is set.
> - */
> -int
> -mlx5_ifreq_base(const struct rte_eth_dev *base,
> -		const struct rte_eth_dev *dev,
> -		int req, struct ifreq *ifr)
> -{
> -	int sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
> -	int ret = 0;
> -
> -	if (sock == -1) {
> -		rte_errno = errno;
> -		return -rte_errno;
> -	}
> -	ret = mlx5_get_ifname_base(base, dev, &ifr->ifr_name);
> -	if (ret)
> -		goto error;
> -	ret = ioctl(sock, req, ifr);
> -	if (ret == -1) {
> -		rte_errno = errno;
> -		goto error;
> -	}
> -	close(sock);
> -	return 0;
> -error:
> -	close(sock);
> -	return -rte_errno;
> -}
> -
> -/**
>  * Get device MTU.
>  *
>  * @param dev
> @@ -872,15 +782,7 @@ int mlx5_fw_version_get(struct rte_eth_dev *dev, char *fw_ver, size_t fw_size)
> 				ifr = (struct ifreq) {
> 					.ifr_data = (void *)&edata,
> 				};
> -				/*
> -				 * Use special version of mlx5_ifreq()
> -				 * to get master device name with local
> -				 * device Netlink socket. Using master
> -				 * device Netlink socket is not thread
> -				 * safe.
> -				 */
> -				ret = mlx5_ifreq_base(dev, master,
> -						      SIOCETHTOOL, &ifr);
> +				ret = mlx5_ifreq(master, SIOCETHTOOL, &ifr);
> 			}
> 		}
> 		if (ret) {
> @@ -977,12 +879,7 @@ int mlx5_fw_version_get(struct rte_eth_dev *dev, char *fw_ver, size_t fw_size)
> 				ifr = (struct ifreq) {
> 					.ifr_data = (void *)&gcmd,
> 				};
> -				/*
> -				 * Avoid using master Netlink socket.
> -				 * This is not thread-safe.
> -				 */
> -				ret = mlx5_ifreq_base(dev, master,
> -						      SIOCETHTOOL, &ifr);
> +				ret = mlx5_ifreq(master, SIOCETHTOOL, &ifr);
> 			}
> 		}
> 		if (ret) {
> @@ -1003,7 +900,7 @@ int mlx5_fw_version_get(struct rte_eth_dev *dev, char *fw_ver, size_t fw_size)
> 
> 	*ecmd = gcmd;
> 	ifr.ifr_data = (void *)ecmd;
> -	ret = mlx5_ifreq_base(dev, master ? master : dev, SIOCETHTOOL, &ifr);
> +	ret = mlx5_ifreq(master ? master : dev, SIOCETHTOOL, &ifr);
> 	if (ret) {
> 		DRV_LOG(DEBUG,
> 			"port %u ioctl(SIOCETHTOOL,"
> -- 
> 1.8.3.1
>