diff options
Diffstat (limited to 'net/ethtool/channels.c')
| -rw-r--r-- | net/ethtool/channels.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/net/ethtool/channels.c b/net/ethtool/channels.c new file mode 100644 index 0000000000..7b4bbd674b --- /dev/null +++ b/net/ethtool/channels.c @@ -0,0 +1,213 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <net/xdp_sock_drv.h> + +#include "netlink.h" +#include "common.h" + +struct channels_req_info { + struct ethnl_req_info base; +}; + +struct channels_reply_data { + struct ethnl_reply_data base; + struct ethtool_channels channels; +}; + +#define CHANNELS_REPDATA(__reply_base) \ + container_of(__reply_base, struct channels_reply_data, base) + +const struct nla_policy ethnl_channels_get_policy[] = { + [ETHTOOL_A_CHANNELS_HEADER] = + NLA_POLICY_NESTED(ethnl_header_policy), +}; + +static int channels_prepare_data(const struct ethnl_req_info *req_base, + struct ethnl_reply_data *reply_base, + const struct genl_info *info) +{ + struct channels_reply_data *data = CHANNELS_REPDATA(reply_base); + struct net_device *dev = reply_base->dev; + int ret; + + if (!dev->ethtool_ops->get_channels) + return -EOPNOTSUPP; + ret = ethnl_ops_begin(dev); + if (ret < 0) + return ret; + dev->ethtool_ops->get_channels(dev, &data->channels); + ethnl_ops_complete(dev); + + return 0; +} + +static int channels_reply_size(const struct ethnl_req_info *req_base, + const struct ethnl_reply_data *reply_base) +{ + return nla_total_size(sizeof(u32)) + /* _CHANNELS_RX_MAX */ + nla_total_size(sizeof(u32)) + /* _CHANNELS_TX_MAX */ + nla_total_size(sizeof(u32)) + /* _CHANNELS_OTHER_MAX */ + nla_total_size(sizeof(u32)) + /* _CHANNELS_COMBINED_MAX */ + nla_total_size(sizeof(u32)) + /* _CHANNELS_RX_COUNT */ + nla_total_size(sizeof(u32)) + /* _CHANNELS_TX_COUNT */ + nla_total_size(sizeof(u32)) + /* _CHANNELS_OTHER_COUNT */ + nla_total_size(sizeof(u32)); /* _CHANNELS_COMBINED_COUNT */ +} + +static int channels_fill_reply(struct sk_buff *skb, + const struct ethnl_req_info *req_base, + const struct ethnl_reply_data *reply_base) +{ + const struct channels_reply_data *data = CHANNELS_REPDATA(reply_base); + const struct ethtool_channels *channels = &data->channels; + + if ((channels->max_rx && + (nla_put_u32(skb, ETHTOOL_A_CHANNELS_RX_MAX, + channels->max_rx) || + nla_put_u32(skb, ETHTOOL_A_CHANNELS_RX_COUNT, + channels->rx_count))) || + (channels->max_tx && + (nla_put_u32(skb, ETHTOOL_A_CHANNELS_TX_MAX, + channels->max_tx) || + nla_put_u32(skb, ETHTOOL_A_CHANNELS_TX_COUNT, + channels->tx_count))) || + (channels->max_other && + (nla_put_u32(skb, ETHTOOL_A_CHANNELS_OTHER_MAX, + channels->max_other) || + nla_put_u32(skb, ETHTOOL_A_CHANNELS_OTHER_COUNT, + channels->other_count))) || + (channels->max_combined && + (nla_put_u32(skb, ETHTOOL_A_CHANNELS_COMBINED_MAX, + channels->max_combined) || + nla_put_u32(skb, ETHTOOL_A_CHANNELS_COMBINED_COUNT, + channels->combined_count)))) + return -EMSGSIZE; + + return 0; +} + +/* CHANNELS_SET */ + +const struct nla_policy ethnl_channels_set_policy[] = { + [ETHTOOL_A_CHANNELS_HEADER] = + NLA_POLICY_NESTED(ethnl_header_policy), + [ETHTOOL_A_CHANNELS_RX_COUNT] = { .type = NLA_U32 }, + [ETHTOOL_A_CHANNELS_TX_COUNT] = { .type = NLA_U32 }, + [ETHTOOL_A_CHANNELS_OTHER_COUNT] = { .type = NLA_U32 }, + [ETHTOOL_A_CHANNELS_COMBINED_COUNT] = { .type = NLA_U32 }, +}; + +static int +ethnl_set_channels_validate(struct ethnl_req_info *req_info, + struct genl_info *info) +{ + const struct ethtool_ops *ops = req_info->dev->ethtool_ops; + + return ops->get_channels && ops->set_channels ? 1 : -EOPNOTSUPP; +} + +static int +ethnl_set_channels(struct ethnl_req_info *req_info, struct genl_info *info) +{ + unsigned int from_channel, old_total, i; + bool mod = false, mod_combined = false; + struct net_device *dev = req_info->dev; + struct ethtool_channels channels = {}; + struct nlattr **tb = info->attrs; + u32 err_attr, max_rxfh_in_use; + u64 max_rxnfc_in_use; + int ret; + + dev->ethtool_ops->get_channels(dev, &channels); + old_total = channels.combined_count + + max(channels.rx_count, channels.tx_count); + + ethnl_update_u32(&channels.rx_count, tb[ETHTOOL_A_CHANNELS_RX_COUNT], + &mod); + ethnl_update_u32(&channels.tx_count, tb[ETHTOOL_A_CHANNELS_TX_COUNT], + &mod); + ethnl_update_u32(&channels.other_count, + tb[ETHTOOL_A_CHANNELS_OTHER_COUNT], &mod); + ethnl_update_u32(&channels.combined_count, + tb[ETHTOOL_A_CHANNELS_COMBINED_COUNT], &mod_combined); + mod |= mod_combined; + if (!mod) + return 0; + + /* ensure new channel counts are within limits */ + if (channels.rx_count > channels.max_rx) + err_attr = ETHTOOL_A_CHANNELS_RX_COUNT; + else if (channels.tx_count > channels.max_tx) + err_attr = ETHTOOL_A_CHANNELS_TX_COUNT; + else if (channels.other_count > channels.max_other) + err_attr = ETHTOOL_A_CHANNELS_OTHER_COUNT; + else if (channels.combined_count > channels.max_combined) + err_attr = ETHTOOL_A_CHANNELS_COMBINED_COUNT; + else + err_attr = 0; + if (err_attr) { + NL_SET_ERR_MSG_ATTR(info->extack, tb[err_attr], + "requested channel count exceeds maximum"); + return -EINVAL; + } + + /* ensure there is at least one RX and one TX channel */ + if (!channels.combined_count && !channels.rx_count) + err_attr = ETHTOOL_A_CHANNELS_RX_COUNT; + else if (!channels.combined_count && !channels.tx_count) + err_attr = ETHTOOL_A_CHANNELS_TX_COUNT; + else + err_attr = 0; + if (err_attr) { + if (mod_combined) + err_attr = ETHTOOL_A_CHANNELS_COMBINED_COUNT; + NL_SET_ERR_MSG_ATTR(info->extack, tb[err_attr], + "requested channel counts would result in no RX or TX channel being configured"); + return -EINVAL; + } + + /* ensure the new Rx count fits within the configured Rx flow + * indirection table/rxnfc settings + */ + if (ethtool_get_max_rxnfc_channel(dev, &max_rxnfc_in_use)) + max_rxnfc_in_use = 0; + if (!netif_is_rxfh_configured(dev) || + ethtool_get_max_rxfh_channel(dev, &max_rxfh_in_use)) + max_rxfh_in_use = 0; + if (channels.combined_count + channels.rx_count <= max_rxfh_in_use) { + GENL_SET_ERR_MSG(info, "requested channel counts are too low for existing indirection table settings"); + return -EINVAL; + } + if (channels.combined_count + channels.rx_count <= max_rxnfc_in_use) { + GENL_SET_ERR_MSG(info, "requested channel counts are too low for existing ntuple filter settings"); + return -EINVAL; + } + + /* Disabling channels, query zero-copy AF_XDP sockets */ + from_channel = channels.combined_count + + min(channels.rx_count, channels.tx_count); + for (i = from_channel; i < old_total; i++) + if (xsk_get_pool_from_qid(dev, i)) { + GENL_SET_ERR_MSG(info, "requested channel counts are too low for existing zerocopy AF_XDP sockets"); + return -EINVAL; + } + + ret = dev->ethtool_ops->set_channels(dev, &channels); + return ret < 0 ? ret : 1; +} + +const struct ethnl_request_ops ethnl_channels_request_ops = { + .request_cmd = ETHTOOL_MSG_CHANNELS_GET, + .reply_cmd = ETHTOOL_MSG_CHANNELS_GET_REPLY, + .hdr_attr = ETHTOOL_A_CHANNELS_HEADER, + .req_info_size = sizeof(struct channels_req_info), + .reply_data_size = sizeof(struct channels_reply_data), + + .prepare_data = channels_prepare_data, + .reply_size = channels_reply_size, + .fill_reply = channels_fill_reply, + + .set_validate = ethnl_set_channels_validate, + .set = ethnl_set_channels, + .set_ntf_cmd = ETHTOOL_MSG_CHANNELS_NTF, +}; |