ethtool: Add support for configuring PFC stall prevention in ethtool (e1577c1c) · Commits · 戴 / test

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>

include/uapi/linux/ethtool.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -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

net/core/ethtool.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}

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