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ethtool: Add support for configuring PFC stall prevention in ethtool 

In the event where the device unexpectedly becomes unresponsive
for a long period of time, flow control mechanism may propagate
pause frames which will cause congestion spreading to the entire
network.
To prevent this scenario, when the device is stalled for a period
longer than a pre-configured timeout, flow control mechanisms are
automatically disabled.

This patch adds support for the ETHTOOL_PFC_STALL_PREVENTION
as a tunable.
This API provides support for configuring flow control storm prevention
timeout (msec).

Signed-off-by: Inbar Karmy <inbark@mellanox.com>
Cc: Michal Kubecek <mkubecek@suse.cz>
Cc: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
hifive-unleashed-5.1
Inbar Karmy 2017-11-20 16:14:30 +02:00 committed by Saeed Mahameed
parent 2fcb12df7d
commit e1577c1c88
2 changed files with 10 additions and 0 deletions
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4
include/uapi/linux/ethtool.h
View File

@ -217,10 +217,14 @@ struct ethtool_value {
__u32 data;
};
#define PFC_STORM_PREVENTION_AUTO 0xffff
#define PFC_STORM_PREVENTION_DISABLE 0
enum tunable_id {
ETHTOOL_ID_UNSPEC,
ETHTOOL_RX_COPYBREAK,
ETHTOOL_TX_COPYBREAK,
ETHTOOL_PFC_PREVENTION_TOUT, /* timeout in msecs */
/*
* Add your fresh new tubale attribute above and remember to update
* tunable_strings[] in net/core/ethtool.c

6
net/core/ethtool.c
View File

@ -121,6 +121,7 @@ tunable_strings[__ETHTOOL_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
[ETHTOOL_ID_UNSPEC] = "Unspec",
[ETHTOOL_RX_COPYBREAK] = "rx-copybreak",
[ETHTOOL_TX_COPYBREAK] = "tx-copybreak",
[ETHTOOL_PFC_PREVENTION_TOUT] = "pfc-prevention-tout",
};
static const char
@ -2311,6 +2312,11 @@ static int ethtool_tunable_valid(const struct ethtool_tunable *tuna)
tuna->type_id != ETHTOOL_TUNABLE_U32)
return -EINVAL;
break;
case ETHTOOL_PFC_PREVENTION_TOUT:
if (tuna->len != sizeof(u16) ||
tuna->type_id != ETHTOOL_TUNABLE_U16)
return -EINVAL;
break;
default:
return -EINVAL;
}