channels.c (7023B)
1// SPDX-License-Identifier: GPL-2.0-only 2 3#include <net/xdp_sock_drv.h> 4 5#include "netlink.h" 6#include "common.h" 7 8struct channels_req_info { 9 struct ethnl_req_info base; 10}; 11 12struct channels_reply_data { 13 struct ethnl_reply_data base; 14 struct ethtool_channels channels; 15}; 16 17#define CHANNELS_REPDATA(__reply_base) \ 18 container_of(__reply_base, struct channels_reply_data, base) 19 20const struct nla_policy ethnl_channels_get_policy[] = { 21 [ETHTOOL_A_CHANNELS_HEADER] = 22 NLA_POLICY_NESTED(ethnl_header_policy), 23}; 24 25static int channels_prepare_data(const struct ethnl_req_info *req_base, 26 struct ethnl_reply_data *reply_base, 27 struct genl_info *info) 28{ 29 struct channels_reply_data *data = CHANNELS_REPDATA(reply_base); 30 struct net_device *dev = reply_base->dev; 31 int ret; 32 33 if (!dev->ethtool_ops->get_channels) 34 return -EOPNOTSUPP; 35 ret = ethnl_ops_begin(dev); 36 if (ret < 0) 37 return ret; 38 dev->ethtool_ops->get_channels(dev, &data->channels); 39 ethnl_ops_complete(dev); 40 41 return 0; 42} 43 44static int channels_reply_size(const struct ethnl_req_info *req_base, 45 const struct ethnl_reply_data *reply_base) 46{ 47 return nla_total_size(sizeof(u32)) + /* _CHANNELS_RX_MAX */ 48 nla_total_size(sizeof(u32)) + /* _CHANNELS_TX_MAX */ 49 nla_total_size(sizeof(u32)) + /* _CHANNELS_OTHER_MAX */ 50 nla_total_size(sizeof(u32)) + /* _CHANNELS_COMBINED_MAX */ 51 nla_total_size(sizeof(u32)) + /* _CHANNELS_RX_COUNT */ 52 nla_total_size(sizeof(u32)) + /* _CHANNELS_TX_COUNT */ 53 nla_total_size(sizeof(u32)) + /* _CHANNELS_OTHER_COUNT */ 54 nla_total_size(sizeof(u32)); /* _CHANNELS_COMBINED_COUNT */ 55} 56 57static int channels_fill_reply(struct sk_buff *skb, 58 const struct ethnl_req_info *req_base, 59 const struct ethnl_reply_data *reply_base) 60{ 61 const struct channels_reply_data *data = CHANNELS_REPDATA(reply_base); 62 const struct ethtool_channels *channels = &data->channels; 63 64 if ((channels->max_rx && 65 (nla_put_u32(skb, ETHTOOL_A_CHANNELS_RX_MAX, 66 channels->max_rx) || 67 nla_put_u32(skb, ETHTOOL_A_CHANNELS_RX_COUNT, 68 channels->rx_count))) || 69 (channels->max_tx && 70 (nla_put_u32(skb, ETHTOOL_A_CHANNELS_TX_MAX, 71 channels->max_tx) || 72 nla_put_u32(skb, ETHTOOL_A_CHANNELS_TX_COUNT, 73 channels->tx_count))) || 74 (channels->max_other && 75 (nla_put_u32(skb, ETHTOOL_A_CHANNELS_OTHER_MAX, 76 channels->max_other) || 77 nla_put_u32(skb, ETHTOOL_A_CHANNELS_OTHER_COUNT, 78 channels->other_count))) || 79 (channels->max_combined && 80 (nla_put_u32(skb, ETHTOOL_A_CHANNELS_COMBINED_MAX, 81 channels->max_combined) || 82 nla_put_u32(skb, ETHTOOL_A_CHANNELS_COMBINED_COUNT, 83 channels->combined_count)))) 84 return -EMSGSIZE; 85 86 return 0; 87} 88 89const struct ethnl_request_ops ethnl_channels_request_ops = { 90 .request_cmd = ETHTOOL_MSG_CHANNELS_GET, 91 .reply_cmd = ETHTOOL_MSG_CHANNELS_GET_REPLY, 92 .hdr_attr = ETHTOOL_A_CHANNELS_HEADER, 93 .req_info_size = sizeof(struct channels_req_info), 94 .reply_data_size = sizeof(struct channels_reply_data), 95 96 .prepare_data = channels_prepare_data, 97 .reply_size = channels_reply_size, 98 .fill_reply = channels_fill_reply, 99}; 100 101/* CHANNELS_SET */ 102 103const struct nla_policy ethnl_channels_set_policy[] = { 104 [ETHTOOL_A_CHANNELS_HEADER] = 105 NLA_POLICY_NESTED(ethnl_header_policy), 106 [ETHTOOL_A_CHANNELS_RX_COUNT] = { .type = NLA_U32 }, 107 [ETHTOOL_A_CHANNELS_TX_COUNT] = { .type = NLA_U32 }, 108 [ETHTOOL_A_CHANNELS_OTHER_COUNT] = { .type = NLA_U32 }, 109 [ETHTOOL_A_CHANNELS_COMBINED_COUNT] = { .type = NLA_U32 }, 110}; 111 112int ethnl_set_channels(struct sk_buff *skb, struct genl_info *info) 113{ 114 unsigned int from_channel, old_total, i; 115 bool mod = false, mod_combined = false; 116 struct ethtool_channels channels = {}; 117 struct ethnl_req_info req_info = {}; 118 struct nlattr **tb = info->attrs; 119 u32 err_attr, max_rx_in_use = 0; 120 const struct ethtool_ops *ops; 121 struct net_device *dev; 122 int ret; 123 124 ret = ethnl_parse_header_dev_get(&req_info, 125 tb[ETHTOOL_A_CHANNELS_HEADER], 126 genl_info_net(info), info->extack, 127 true); 128 if (ret < 0) 129 return ret; 130 dev = req_info.dev; 131 ops = dev->ethtool_ops; 132 ret = -EOPNOTSUPP; 133 if (!ops->get_channels || !ops->set_channels) 134 goto out_dev; 135 136 rtnl_lock(); 137 ret = ethnl_ops_begin(dev); 138 if (ret < 0) 139 goto out_rtnl; 140 ops->get_channels(dev, &channels); 141 old_total = channels.combined_count + 142 max(channels.rx_count, channels.tx_count); 143 144 ethnl_update_u32(&channels.rx_count, tb[ETHTOOL_A_CHANNELS_RX_COUNT], 145 &mod); 146 ethnl_update_u32(&channels.tx_count, tb[ETHTOOL_A_CHANNELS_TX_COUNT], 147 &mod); 148 ethnl_update_u32(&channels.other_count, 149 tb[ETHTOOL_A_CHANNELS_OTHER_COUNT], &mod); 150 ethnl_update_u32(&channels.combined_count, 151 tb[ETHTOOL_A_CHANNELS_COMBINED_COUNT], &mod_combined); 152 mod |= mod_combined; 153 ret = 0; 154 if (!mod) 155 goto out_ops; 156 157 /* ensure new channel counts are within limits */ 158 if (channels.rx_count > channels.max_rx) 159 err_attr = ETHTOOL_A_CHANNELS_RX_COUNT; 160 else if (channels.tx_count > channels.max_tx) 161 err_attr = ETHTOOL_A_CHANNELS_TX_COUNT; 162 else if (channels.other_count > channels.max_other) 163 err_attr = ETHTOOL_A_CHANNELS_OTHER_COUNT; 164 else if (channels.combined_count > channels.max_combined) 165 err_attr = ETHTOOL_A_CHANNELS_COMBINED_COUNT; 166 else 167 err_attr = 0; 168 if (err_attr) { 169 ret = -EINVAL; 170 NL_SET_ERR_MSG_ATTR(info->extack, tb[err_attr], 171 "requested channel count exceeds maximum"); 172 goto out_ops; 173 } 174 175 /* ensure there is at least one RX and one TX channel */ 176 if (!channels.combined_count && !channels.rx_count) 177 err_attr = ETHTOOL_A_CHANNELS_RX_COUNT; 178 else if (!channels.combined_count && !channels.tx_count) 179 err_attr = ETHTOOL_A_CHANNELS_TX_COUNT; 180 else 181 err_attr = 0; 182 if (err_attr) { 183 if (mod_combined) 184 err_attr = ETHTOOL_A_CHANNELS_COMBINED_COUNT; 185 ret = -EINVAL; 186 NL_SET_ERR_MSG_ATTR(info->extack, tb[err_attr], 187 "requested channel counts would result in no RX or TX channel being configured"); 188 goto out_ops; 189 } 190 191 /* ensure the new Rx count fits within the configured Rx flow 192 * indirection table settings 193 */ 194 if (netif_is_rxfh_configured(dev) && 195 !ethtool_get_max_rxfh_channel(dev, &max_rx_in_use) && 196 (channels.combined_count + channels.rx_count) <= max_rx_in_use) { 197 ret = -EINVAL; 198 GENL_SET_ERR_MSG(info, "requested channel counts are too low for existing indirection table settings"); 199 goto out_ops; 200 } 201 202 /* Disabling channels, query zero-copy AF_XDP sockets */ 203 from_channel = channels.combined_count + 204 min(channels.rx_count, channels.tx_count); 205 for (i = from_channel; i < old_total; i++) 206 if (xsk_get_pool_from_qid(dev, i)) { 207 ret = -EINVAL; 208 GENL_SET_ERR_MSG(info, "requested channel counts are too low for existing zerocopy AF_XDP sockets"); 209 goto out_ops; 210 } 211 212 ret = dev->ethtool_ops->set_channels(dev, &channels); 213 if (ret < 0) 214 goto out_ops; 215 ethtool_notify(dev, ETHTOOL_MSG_CHANNELS_NTF, NULL); 216 217out_ops: 218 ethnl_ops_complete(dev); 219out_rtnl: 220 rtnl_unlock(); 221out_dev: 222 ethnl_parse_header_dev_put(&req_info); 223 return ret; 224}