From f394d07b192b67a895dbed76253ce95dcbb5d17c Mon Sep 17 00:00:00 2001 From: Taehee Yoo Date: Tue, 14 Jan 2025 14:28:51 +0000 Subject: netdevsim: add HDS feature HDS options(tcp-data-split, hds-thresh) have dependencies between other features like XDP. Basic dependencies are checked in the core API. netdevsim is very useful to check basic dependencies. The default tcp-data-split mode is UNKNOWN but netdevsim driver returns ENABLED when ethtool dumps tcp-data-split mode. The default value of HDS threshold is 0 and the maximum value is 1024. ethtool shows like this. ethtool -g eni1np1 Ring parameters for eni1np1: Pre-set maximums: ... HDS thresh: 1024 Current hardware settings: ... TCP data split: on HDS thresh: 0 ethtool -G eni1np1 tcp-data-split on hds-thresh 1024 ethtool -g eni1np1 Ring parameters for eni1np1: Pre-set maximums: ... HDS thresh: 1024 Current hardware settings: ... TCP data split: on HDS thresh: 1024 Signed-off-by: Taehee Yoo Link: https://patch.msgid.link/20250114142852.3364986-10-ap420073@gmail.com Signed-off-by: Jakub Kicinski --- drivers/net/netdevsim/netdev.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/net/netdevsim/netdev.c') diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c index d013b6498539..f92b05ccdca9 100644 --- a/drivers/net/netdevsim/netdev.c +++ b/drivers/net/netdevsim/netdev.c @@ -15,6 +15,7 @@ #include #include +#include #include #include #include @@ -54,6 +55,7 @@ static int nsim_forward_skb(struct net_device *dev, struct sk_buff *skb, static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct netdevsim *ns = netdev_priv(dev); + struct ethtool_netdev_state *ethtool; struct net_device *peer_dev; unsigned int len = skb->len; struct netdevsim *peer_ns; @@ -74,6 +76,13 @@ static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev) rxq = rxq % peer_dev->num_rx_queues; rq = peer_ns->rq[rxq]; + ethtool = peer_dev->ethtool; + if (skb_is_nonlinear(skb) && + (ethtool->hds_config != ETHTOOL_TCP_DATA_SPLIT_ENABLED || + (ethtool->hds_config == ETHTOOL_TCP_DATA_SPLIT_ENABLED && + ethtool->hds_thresh > len))) + skb_linearize(skb); + skb_tx_timestamp(skb); if (unlikely(nsim_forward_skb(peer_dev, skb, rq) == NET_RX_DROP)) goto out_drop_cnt; -- cgit v1.2.3