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common/mlx5: fix Netlink port name padding in probing

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On some kernels the string attributes within Netlink
reply messages might be not padded with zeroes (in cases
when string length is aligned with 4-byte boundary).
While device probing, the physical port name was wrongly recognized,
causing a probing failure.

Fixes: 30a86157f6 ("net/mlx5: support PF representor")
Cc: stable@dpdk.org

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>
This commit is contained in:
Viacheslav Ovsiienko 2021-06-19 16:56:28 +03:00 committed by Raslan Darawsheh
parent b57e414b48
commit 568d97c09c
1 changed files with 21 additions and 1 deletions
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22
drivers/common/mlx5/linux/mlx5_nl.c
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@ -33,6 +33,8 @@
#define MLX5_SEND_BUF_SIZE 32768
/* Receive buffer size for the Netlink socket */
#define MLX5_RECV_BUF_SIZE 32768
/* Maximal physical port name length. */
#define MLX5_PHYS_PORT_NAME_MAX 128
/** Parameters of VLAN devices created by driver. */
#define MLX5_VMWA_VLAN_DEVICE_PFX "evmlx"
@ -1191,6 +1193,7 @@ mlx5_nl_switch_info_cb(struct nlmsghdr *nh, void *arg)
size_t off = NLMSG_LENGTH(sizeof(struct ifinfomsg));
bool switch_id_set = false;
bool num_vf_set = false;
int len;
if (nh->nlmsg_type != RTM_NEWLINK)
goto error;
@ -1206,7 +1209,24 @@ mlx5_nl_switch_info_cb(struct nlmsghdr *nh, void *arg)
num_vf_set = true;
break;
case IFLA_PHYS_PORT_NAME:
mlx5_translate_port_name((char *)payload, &info);
len = RTA_PAYLOAD(ra);
/* Some kernels do not pad attributes with zero. */
if (len > 0 && len < MLX5_PHYS_PORT_NAME_MAX) {
char name[MLX5_PHYS_PORT_NAME_MAX];
/*
* We can't just patch the message with padding
* zero - it might corrupt the following items
* in the message, we have to copy the string
* by attribute length and pad the copied one.
*/
memcpy(name, payload, len);
name[len] = 0;
mlx5_translate_port_name(name, &info);
} else {
info.name_type =
MLX5_PHYS_PORT_NAME_TYPE_UNKNOWN;
}
break;
case IFLA_PHYS_SWITCH_ID:
info.switch_id = 0;