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author | Michal Kubecek <mkubecek@suse.cz> | 2020-03-12 21:08:28 +0100 |
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committer | David S. Miller <davem@davemloft.net> | 2020-03-12 15:32:33 -0700 |
commit | 2fc2929e807211a9535a6541f24b57fa1c469728 (patch) | |
tree | d0b54b418d516850bfd30e48a756d5f43890f642 /net/ethtool/rings.c | |
parent | e4a1717b677c5cb285e9b425c569e261084a484c (diff) | |
download | linux-stable-2fc2929e807211a9535a6541f24b57fa1c469728.tar.gz linux-stable-2fc2929e807211a9535a6541f24b57fa1c469728.tar.bz2 linux-stable-2fc2929e807211a9535a6541f24b57fa1c469728.zip |
ethtool: set device ring sizes with RINGS_SET request
Implement RINGS_SET netlink request to set ring sizes of a network device.
These are traditionally set with ETHTOOL_SRINGPARAM ioctl request.
Like the ioctl implementation, the generic ethtool code checks if supplied
values do not exceed driver defined limits; if they do, first offending
attribute is reported using extack.
v2:
- fix netdev reference leak in error path (found by Jakub Kicinsky)
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ethtool/rings.c')
-rw-r--r-- | net/ethtool/rings.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/net/ethtool/rings.c b/net/ethtool/rings.c index d3129d8a252d..93f428e9a6c2 100644 --- a/net/ethtool/rings.c +++ b/net/ethtool/rings.c @@ -106,3 +106,92 @@ const struct ethnl_request_ops ethnl_rings_request_ops = { .reply_size = rings_reply_size, .fill_reply = rings_fill_reply, }; + +/* RINGS_SET */ + +static const struct nla_policy +rings_set_policy[ETHTOOL_A_RINGS_MAX + 1] = { + [ETHTOOL_A_RINGS_UNSPEC] = { .type = NLA_REJECT }, + [ETHTOOL_A_RINGS_HEADER] = { .type = NLA_NESTED }, + [ETHTOOL_A_RINGS_RX_MAX] = { .type = NLA_REJECT }, + [ETHTOOL_A_RINGS_RX_MINI_MAX] = { .type = NLA_REJECT }, + [ETHTOOL_A_RINGS_RX_JUMBO_MAX] = { .type = NLA_REJECT }, + [ETHTOOL_A_RINGS_TX_MAX] = { .type = NLA_REJECT }, + [ETHTOOL_A_RINGS_RX] = { .type = NLA_U32 }, + [ETHTOOL_A_RINGS_RX_MINI] = { .type = NLA_U32 }, + [ETHTOOL_A_RINGS_RX_JUMBO] = { .type = NLA_U32 }, + [ETHTOOL_A_RINGS_TX] = { .type = NLA_U32 }, +}; + +int ethnl_set_rings(struct sk_buff *skb, struct genl_info *info) +{ + struct nlattr *tb[ETHTOOL_A_RINGS_MAX + 1]; + struct ethtool_ringparam ringparam = {}; + struct ethnl_req_info req_info = {}; + const struct nlattr *err_attr; + const struct ethtool_ops *ops; + struct net_device *dev; + bool mod = false; + int ret; + + ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb, + ETHTOOL_A_RINGS_MAX, rings_set_policy, + info->extack); + if (ret < 0) + return ret; + ret = ethnl_parse_header_dev_get(&req_info, + tb[ETHTOOL_A_RINGS_HEADER], + genl_info_net(info), info->extack, + true); + if (ret < 0) + return ret; + dev = req_info.dev; + ops = dev->ethtool_ops; + ret = -EOPNOTSUPP; + if (!ops->get_ringparam || !ops->set_ringparam) + goto out_dev; + + rtnl_lock(); + ret = ethnl_ops_begin(dev); + if (ret < 0) + goto out_rtnl; + ops->get_ringparam(dev, &ringparam); + + ethnl_update_u32(&ringparam.rx_pending, tb[ETHTOOL_A_RINGS_RX], &mod); + ethnl_update_u32(&ringparam.rx_mini_pending, + tb[ETHTOOL_A_RINGS_RX_MINI], &mod); + ethnl_update_u32(&ringparam.rx_jumbo_pending, + tb[ETHTOOL_A_RINGS_RX_JUMBO], &mod); + ethnl_update_u32(&ringparam.tx_pending, tb[ETHTOOL_A_RINGS_TX], &mod); + ret = 0; + if (!mod) + goto out_ops; + + /* ensure new ring parameters are within limits */ + if (ringparam.rx_pending > ringparam.rx_max_pending) + err_attr = tb[ETHTOOL_A_RINGS_RX]; + else if (ringparam.rx_mini_pending > ringparam.rx_mini_max_pending) + err_attr = tb[ETHTOOL_A_RINGS_RX_MINI]; + else if (ringparam.rx_jumbo_pending > ringparam.rx_jumbo_max_pending) + err_attr = tb[ETHTOOL_A_RINGS_RX_JUMBO]; + else if (ringparam.tx_pending > ringparam.tx_max_pending) + err_attr = tb[ETHTOOL_A_RINGS_TX]; + else + err_attr = NULL; + if (err_attr) { + ret = -EINVAL; + NL_SET_ERR_MSG_ATTR(info->extack, err_attr, + "requested ring size exceeeds maximum"); + goto out_ops; + } + + ret = dev->ethtool_ops->set_ringparam(dev, &ringparam); + +out_ops: + ethnl_ops_complete(dev); +out_rtnl: + rtnl_unlock(); +out_dev: + dev_put(dev); + return ret; +} |