net/ethtool/rings.c

Source file repositories/reference/linux-study-clean/net/ethtool/rings.c

File Facts

System
Linux kernel
Corpus path
net/ethtool/rings.c
Extension
.c
Size
11443 bytes
Lines
323
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: implementation source
Status
source implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

struct rings_req_info {
	struct ethnl_req_info		base;
};

struct rings_reply_data {
	struct ethnl_reply_data		base;
	struct ethtool_ringparam	ringparam;
	struct kernel_ethtool_ringparam	kernel_ringparam;
	u32				supported_ring_params;
};

#define RINGS_REPDATA(__reply_base) \
	container_of(__reply_base, struct rings_reply_data, base)

const struct nla_policy ethnl_rings_get_policy[] = {
	[ETHTOOL_A_RINGS_HEADER]		=
		NLA_POLICY_NESTED(ethnl_header_policy),
};

static int rings_prepare_data(const struct ethnl_req_info *req_base,
			      struct ethnl_reply_data *reply_base,
			      const struct genl_info *info)
{
	struct rings_reply_data *data = RINGS_REPDATA(reply_base);
	struct net_device *dev = reply_base->dev;
	int ret;

	if (!dev->ethtool_ops->get_ringparam)
		return -EOPNOTSUPP;

	data->supported_ring_params = dev->ethtool_ops->supported_ring_params;
	ret = ethnl_ops_begin(dev);
	if (ret < 0)
		return ret;

	data->kernel_ringparam.tcp_data_split = dev->cfg->hds_config;
	data->kernel_ringparam.hds_thresh = dev->cfg->hds_thresh;

	dev->ethtool_ops->get_ringparam(dev, &data->ringparam,
					&data->kernel_ringparam, info->extack);
	ethnl_ops_complete(dev);

	return 0;
}

static int rings_reply_size(const struct ethnl_req_info *req_base,
			    const struct ethnl_reply_data *reply_base)
{
	return nla_total_size(sizeof(u32)) +	/* _RINGS_RX_MAX */
	       nla_total_size(sizeof(u32)) +	/* _RINGS_RX_MINI_MAX */
	       nla_total_size(sizeof(u32)) +	/* _RINGS_RX_JUMBO_MAX */
	       nla_total_size(sizeof(u32)) +	/* _RINGS_TX_MAX */
	       nla_total_size(sizeof(u32)) +	/* _RINGS_RX */
	       nla_total_size(sizeof(u32)) +	/* _RINGS_RX_MINI */
	       nla_total_size(sizeof(u32)) +	/* _RINGS_RX_JUMBO */
	       nla_total_size(sizeof(u32)) +	/* _RINGS_TX */
	       nla_total_size(sizeof(u32)) +	/* _RINGS_RX_BUF_LEN */
	       nla_total_size(sizeof(u8))  +	/* _RINGS_TCP_DATA_SPLIT */
	       nla_total_size(sizeof(u32)) +	/* _RINGS_CQE_SIZE */
	       nla_total_size(sizeof(u8))  +	/* _RINGS_TX_PUSH */
	       nla_total_size(sizeof(u8))  +	/* _RINGS_RX_PUSH */
	       nla_total_size(sizeof(u32)) +	/* _RINGS_TX_PUSH_BUF_LEN */
	       nla_total_size(sizeof(u32)) +	/* _RINGS_TX_PUSH_BUF_LEN_MAX */
	       nla_total_size(sizeof(u32)) +	/* _RINGS_HDS_THRESH */
	       nla_total_size(sizeof(u32));	/* _RINGS_HDS_THRESH_MAX*/
}

static int rings_fill_reply(struct sk_buff *skb,
			    const struct ethnl_req_info *req_base,
			    const struct ethnl_reply_data *reply_base)
{
	const struct rings_reply_data *data = RINGS_REPDATA(reply_base);
	const struct kernel_ethtool_ringparam *kr = &data->kernel_ringparam;
	const struct ethtool_ringparam *ringparam = &data->ringparam;
	u32 supported_ring_params = data->supported_ring_params;

	WARN_ON(kr->tcp_data_split > ETHTOOL_TCP_DATA_SPLIT_ENABLED);

	if ((ringparam->rx_max_pending &&
	     (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MAX,
			  ringparam->rx_max_pending) ||
	      nla_put_u32(skb, ETHTOOL_A_RINGS_RX,
			  ringparam->rx_pending))) ||
	    (ringparam->rx_mini_max_pending &&
	     (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MINI_MAX,
			  ringparam->rx_mini_max_pending) ||
	      nla_put_u32(skb, ETHTOOL_A_RINGS_RX_MINI,
			  ringparam->rx_mini_pending))) ||
	    (ringparam->rx_jumbo_max_pending &&
	     (nla_put_u32(skb, ETHTOOL_A_RINGS_RX_JUMBO_MAX,

Annotation

Implementation Notes