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netdevsim: support reporting RSS key, indirection table, and flow hash fields

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Initialize a per-device RSS key in nsim_ethtool_init() using
netdev_rss_key_fill() and wire up get_rxfh_key_size, get_rxfh_indir_size,
get_rxfh, and get_rxfh_fields on nsim_ethtool_ops.

This allows RSS selftests under tools/testing/selftests/drivers/net/ to
exercise both /proc/sys/net/core/netdev_rss_key and ethtool netlink RSS
reporting against netdevsim without requiring physical hardware.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260922163458.3900996-4-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2026-09-22 16:34:57 +00:00 committed by Jakub Kicinski
parent 898d431abd
commit 5fd4208098
2 changed files with 56 additions and 0 deletions
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53
drivers/net/netdevsim/ethtool.c
View File

@ -205,7 +205,59 @@ static int nsim_get_ts_info(struct net_device *dev,
return 0;
}
static u32 nsim_get_rxfh_key_size(struct net_device *dev)
{
return NETDEV_RSS_KEY_LEN;
}
static u32 nsim_get_rxfh_indir_size(struct net_device *dev)
{
return NSIM_RSS_INDIR_SIZE;
}
static int nsim_get_rxfh(struct net_device *dev,
struct ethtool_rxfh_param *rxfh)
{
struct netdevsim *ns = netdev_priv(dev);
u32 i;
rxfh->hfunc = ETH_RSS_HASH_TOP;
if (rxfh->indir) {
for (i = 0; i < NSIM_RSS_INDIR_SIZE; i++)
rxfh->indir[i] = ethtool_rxfh_indir_default(i, ns->ethtool.channels);
}
if (rxfh->key)
memcpy(rxfh->key, ns->ethtool.rss_key,
sizeof(ns->ethtool.rss_key));
return 0;
}
static int nsim_get_rxfh_fields(struct net_device *dev,
struct ethtool_rxfh_fields *info)
{
switch (info->flow_type) {
case TCP_V4_FLOW:
case UDP_V4_FLOW:
case TCP_V6_FLOW:
case UDP_V6_FLOW:
info->data = RXH_IP_SRC | RXH_IP_DST |
RXH_L4_B_0_1 | RXH_L4_B_2_3;
return 0;
case IPV4_FLOW:
case IPV6_FLOW:
info->data = RXH_IP_SRC | RXH_IP_DST;
return 0;
default:
return -EOPNOTSUPP;
}
}
static const struct ethtool_ops nsim_ethtool_ops = {
.get_rxfh_key_size = nsim_get_rxfh_key_size,
.get_rxfh_indir_size = nsim_get_rxfh_indir_size,
.get_rxfh = nsim_get_rxfh,
.get_rxfh_fields = nsim_get_rxfh_fields,
.supported_coalesce_params = ETHTOOL_COALESCE_ALL_PARAMS,
.supported_ring_params = ETHTOOL_RING_USE_TCP_DATA_SPLIT |
ETHTOOL_RING_USE_HDS_THRS,
@ -250,6 +302,7 @@ void nsim_ethtool_init(struct netdevsim *ns)
ns->ethtool.fec.active_fec = ETHTOOL_FEC_NONE;
ns->ethtool.channels = ns->nsim_bus_dev->num_queues;
netdev_rss_key_fill(ns->ethtool.rss_key, sizeof(ns->ethtool.rss_key));
ethtool = debugfs_create_dir("ethtool", ns->nsim_dev_port->ddir);
ns->ethtool_ddir = ethtool;

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

@ -87,10 +87,13 @@ struct nsim_ethtool_pauseparam {
bool report_stats_tx;
};
#define NSIM_RSS_INDIR_SIZE 128
struct nsim_ethtool {
u32 get_err;
u32 set_err;
u32 channels;
u8 rss_key[NETDEV_RSS_KEY_LEN];
struct nsim_ethtool_pauseparam pauseparam;
struct ethtool_coalesce coalesce;
struct ethtool_ringparam ring;