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netdevsim: add HDS feature

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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 <ap420073@gmail.com>
Link: https://patch.msgid.link/20250114142852.3364986-10-ap420073@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Taehee Yoo 2025-01-14 14:28:51 +00:00 • committed by Jakub Kicinski
parent 6b43673a25
commit f394d07b19
3 changed files with 23 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/net/netdevsim/ethtool.c
View file

@ -2,7 +2,6 @@
// Copyright (c) 2020 Facebook
#include <linux/debugfs.h>
#include <linux/ethtool.h>
#include <linux/random.h>
#include "netdevsim.h"
@ -72,6 +71,12 @@ static void nsim_get_ringparam(struct net_device *dev,
struct netdevsim *ns = netdev_priv(dev);
memcpy(ring, &ns->ethtool.ring, sizeof(ns->ethtool.ring));
kernel_ring->tcp_data_split = dev->ethtool->hds_config;
kernel_ring->hds_thresh = dev->ethtool->hds_thresh;
kernel_ring->hds_thresh_max = NSIM_HDS_THRESHOLD_MAX;
if (kernel_ring->tcp_data_split == ETHTOOL_TCP_DATA_SPLIT_UNKNOWN)
kernel_ring->tcp_data_split = ETHTOOL_TCP_DATA_SPLIT_ENABLED;
}
static int nsim_set_ringparam(struct net_device *dev,
@ -161,6 +166,8 @@ static int nsim_get_ts_info(struct net_device *dev,
static const struct ethtool_ops nsim_ethtool_ops = {
.supported_coalesce_params = ETHTOOL_COALESCE_ALL_PARAMS,
.supported_ring_params = ETHTOOL_RING_USE_TCP_DATA_SPLIT |
ETHTOOL_RING_USE_HDS_THRS,
.get_pause_stats = nsim_get_pause_stats,
.get_pauseparam = nsim_get_pauseparam,
.set_pauseparam = nsim_set_pauseparam,
@ -182,6 +189,9 @@ static void nsim_ethtool_ring_init(struct netdevsim *ns)
ns->ethtool.ring.rx_jumbo_max_pending = 4096;
ns->ethtool.ring.rx_mini_max_pending = 4096;
ns->ethtool.ring.tx_max_pending = 4096;
ns->netdev->ethtool->hds_config = ETHTOOL_TCP_DATA_SPLIT_UNKNOWN;
ns->netdev->ethtool->hds_thresh = 0;
}
void nsim_ethtool_init(struct netdevsim *ns)

9
drivers/net/netdevsim/netdev.c
View file

@ -15,6 +15,7 @@
#include <linux/debugfs.h>
#include <linux/etherdevice.h>
#include <linux/ethtool_netlink.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
@ -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;

3
drivers/net/netdevsim/netdevsim.h
View file

@ -16,6 +16,7 @@
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/ethtool.h>
#include <linux/ethtool_netlink.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/netdevice.h>
@ -36,6 +37,8 @@
#define NSIM_IPSEC_VALID BIT(31)
#define NSIM_UDP_TUNNEL_N_PORTS 4
#define NSIM_HDS_THRESHOLD_MAX 1024
struct nsim_sa {
struct xfrm_state *xs;
__be32 ipaddr[4];