net/ethtool/pause.c

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

File Facts

System
Linux kernel
Corpus path
net/ethtool/pause.c
Extension
.c
Size
6357 bytes
Lines
223
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 pause_req_info {
	struct ethnl_req_info		base;
	enum ethtool_mac_stats_src	src;
};

#define PAUSE_REQINFO(__req_base) \
	container_of(__req_base, struct pause_req_info, base)

struct pause_reply_data {
	struct ethnl_reply_data		base;
	struct ethtool_pauseparam	pauseparam;
	struct ethtool_pause_stats	pausestat;
};

#define PAUSE_REPDATA(__reply_base) \
	container_of(__reply_base, struct pause_reply_data, base)

const struct nla_policy ethnl_pause_get_policy[] = {
	[ETHTOOL_A_PAUSE_HEADER]		=
		NLA_POLICY_NESTED(ethnl_header_policy_stats),
	[ETHTOOL_A_PAUSE_STATS_SRC]		=
		NLA_POLICY_MAX(NLA_U32, ETHTOOL_MAC_STATS_SRC_PMAC),
};

static int pause_parse_request(struct ethnl_req_info *req_base,
			       const struct genl_info *info,
			       struct nlattr **tb,
			       struct netlink_ext_ack *extack)
{
	enum ethtool_mac_stats_src src = ETHTOOL_MAC_STATS_SRC_AGGREGATE;
	struct pause_req_info *req_info = PAUSE_REQINFO(req_base);

	if (tb[ETHTOOL_A_PAUSE_STATS_SRC]) {
		if (!(req_base->flags & ETHTOOL_FLAG_STATS)) {
			NL_SET_ERR_MSG_MOD(extack,
					   "ETHTOOL_FLAG_STATS must be set when requesting a source of stats");
			return -EINVAL;
		}

		src = nla_get_u32(tb[ETHTOOL_A_PAUSE_STATS_SRC]);
	}

	req_info->src = src;

	return 0;
}

static int pause_prepare_data(const struct ethnl_req_info *req_base,
			      struct ethnl_reply_data *reply_base,
			      const struct genl_info *info)
{
	const struct pause_req_info *req_info = PAUSE_REQINFO(req_base);
	struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
	enum ethtool_mac_stats_src src = req_info->src;
	struct net_device *dev = reply_base->dev;
	int ret;

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

	ethtool_stats_init((u64 *)&data->pausestat,
			   sizeof(data->pausestat) / 8);
	data->pausestat.src = src;

	ret = ethnl_ops_begin(dev);
	if (ret < 0)
		return ret;

	if ((src == ETHTOOL_MAC_STATS_SRC_EMAC ||
	     src == ETHTOOL_MAC_STATS_SRC_PMAC) &&
	    !__ethtool_dev_mm_supported(dev)) {
		NL_SET_ERR_MSG_MOD(info->extack,
				   "Device does not support MAC merge layer");
		ethnl_ops_complete(dev);
		return -EOPNOTSUPP;
	}

	dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
	if (req_base->flags & ETHTOOL_FLAG_STATS &&
	    dev->ethtool_ops->get_pause_stats)
		dev->ethtool_ops->get_pause_stats(dev, &data->pausestat);

	ethnl_ops_complete(dev);

	return 0;
}

static int pause_reply_size(const struct ethnl_req_info *req_base,
			    const struct ethnl_reply_data *reply_base)
{

Annotation

Implementation Notes