When tcp-data-split is UNKNOWN mode, drivers arbitrarily handle it.
For example, bnxt_en driver automatically enables if at least one of
LRO/GRO/JUMBO is enabled.
If tcp-data-split is UNKNOWN and LRO is enabled, a driver returns
ENABLES of tcp-data-split, not UNKNOWN.
So, `ethtool -g eth0` shows tcp-data-split is enabled.
The problem is in the setting situation.
In the ethnl_set_rings(), it first calls get_ringparam() to get the
current driver's config.
At that moment, if driver's tcp-data-split config is UNKNOWN, it returns
ENABLE if LRO/GRO/JUMBO is enabled.
Then, it sets values from the user and driver's current config to
kernel_ethtool_ringparam.
Last it calls .set_ringparam().
The driver, especially bnxt_en driver receives
ETHTOOL_TCP_DATA_SPLIT_ENABLED.
But it can't distinguish whether it is set by the user or just the
current config.
When user updates ring parameter, the new hds_config value is updated
and current hds_config value is stored to old_hdsconfig.
Driver's .set_ringparam() callback can distinguish a passed
tcp-data-split value is came from user explicitly.
If .set_ringparam() is failed, hds_config is rollbacked immediately.
Suggested-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Reviewed-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Taehee Yoo <ap420073@xxxxxxxxx>
---
v7:
- Add review tag from Jakub.
- Add dev_xdp_sb_prog_count().
v6:
- use hds_config instead of using tcp_data_split_mod.
v5:
- Patch added.
include/linux/ethtool.h | 2 ++
include/linux/netdevice.h | 1 +
net/core/dev.c | 12 ++++++++++++
net/ethtool/rings.c | 12 ++++++++++++
4 files changed, 27 insertions(+)
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index f711bfd75c4d..4e451084d58a 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -1134,12 +1134,14 @@ int ethtool_virtdev_set_link_ksettings(struct net_device *dev,
* @rss_ctx: XArray of custom RSS contexts
* @rss_lock: Protects entries in @rss_ctx. May be taken from
* within RTNL.
+ * @hds_config: HDS value from userspace.
* @wol_enabled: Wake-on-LAN is enabled
* @module_fw_flash_in_progress: Module firmware flashing is in progress.
*/
struct ethtool_netdev_state {
struct xarray rss_ctx;
struct mutex rss_lock;
+ u8 hds_config;
unsigned wol_enabled:1;
unsigned module_fw_flash_in_progress:1;
};
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 2593019ad5b1..2b06450cacd4 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -4084,6 +4084,7 @@ struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog);
u8 dev_xdp_prog_count(struct net_device *dev);
int dev_xdp_propagate(struct net_device *dev, struct netdev_bpf *bpf);
+u8 dev_xdp_sb_prog_count(struct net_device *dev);
u32 dev_xdp_prog_id(struct net_device *dev, enum bpf_xdp_mode mode);
u32 dev_get_min_mp_channel_count(const struct net_device *dev);
diff --git a/net/core/dev.c b/net/core/dev.c
index c7f3dea3e0eb..bc98f4920e12 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -9480,6 +9480,18 @@ u8 dev_xdp_prog_count(struct net_device *dev)
}
EXPORT_SYMBOL_GPL(dev_xdp_prog_count);
+u8 dev_xdp_sb_prog_count(struct net_device *dev)
+{
+ u8 count = 0;
+ int i;
+
+ for (i = 0; i < __MAX_XDP_MODE; i++)
+ if (dev->xdp_state[i].prog &&
+ !dev->xdp_state[i].prog->aux->xdp_has_frags)
+ count++;
+ return count;
+}
+
int dev_xdp_propagate(struct net_device *dev, struct netdev_bpf *bpf)
{
if (!dev->netdev_ops->ndo_bpf)
diff --git a/net/ethtool/rings.c b/net/ethtool/rings.c
index b7865a14fdf8..b2a2586b241f 100644
--- a/net/ethtool/rings.c
+++ b/net/ethtool/rings.c
@@ -203,6 +203,7 @@ ethnl_set_rings(struct ethnl_req_info *req_info, struct genl_info *info)
dev->ethtool_ops->get_ringparam(dev, &ringparam,
&kernel_ringparam, info->extack);
+ kernel_ringparam.tcp_data_split = dev->ethtool->hds_config;
ethnl_update_u32(&ringparam.rx_pending, tb[ETHTOOL_A_RINGS_RX], &mod);
ethnl_update_u32(&ringparam.rx_mini_pending,
@@ -225,6 +226,14 @@ ethnl_set_rings(struct ethnl_req_info *req_info, struct genl_info *info)
if (!mod)
return 0;
+ if (kernel_ringparam.tcp_data_split == ETHTOOL_TCP_DATA_SPLIT_ENABLED &&
+ dev_xdp_sb_prog_count(dev)) {
+ NL_SET_ERR_MSG_ATTR(info->extack,
+ tb[ETHTOOL_A_RINGS_TCP_DATA_SPLIT],
+ "tcp-data-split can not be enabled with single buffer XDP");
+ return -EINVAL;
+ }
+
/* ensure new ring parameters are within limits */
if (ringparam.rx_pending > ringparam.rx_max_pending)
err_attr = tb[ETHTOOL_A_RINGS_RX];
@@ -252,6 +261,9 @@ ethnl_set_rings(struct ethnl_req_info *req_info, struct genl_info *info)
ret = dev->ethtool_ops->set_ringparam(dev, &ringparam,
&kernel_ringparam, info->extack);
+ if (!ret)
+ dev->ethtool->hds_config = kernel_ringparam.tcp_data_split;
+
return ret < 0 ? ret : 1;
}
--
2.34.1
