bybrooklyn/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-04-18 14:53:58 -04:00
Code Issues Packages Projects Releases Wiki Activity

netdevsim: add HDS feature

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

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;