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Date: Mon, 9 Nov 2020 14:29:59 +0100 (CET)
From: Michal Kubecek <mkubecek@...e.cz>
To: netdev@...r.kernel.org
Cc: Ido Schimmel <idosch@...sch.org>, Jakub Kicinski <kuba@...nel.org>,
Ivan Vecera <ivecera@...hat.com>
Subject: [PATCH ethtool 2/2] ethtool: Improve compatibility between netlink
and ioctl interfaces
From: Ido Schimmel <idosch@...dia.com>
With the ioctl interface, when autoneg is enabled, but without
specifying speed, duplex or link modes, the advertised link modes are
set to the supported link modes by the ethtool user space utility.
This does not happen when using the netlink interface. Fix this
incompatibility problem by having ethtool query the supported link modes
from the kernel and advertise all the "real" ones when only "autoneg on"
is specified.
Before:
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 100baseT/Half 100baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Speed: 1000Mb/s
Duplex: Full
Auto-negotiation: on
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
MDI-X: off (auto)
Supports Wake-on: umbg
Wake-on: d
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
After:
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Supported FEC modes: Not reported
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Speed: 1000Mb/s
Duplex: Full
Auto-negotiation: on
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
MDI-X: on (auto)
Supports Wake-on: umbg
Wake-on: d
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
Signed-off-by: Ido Schimmel <idosch@...dia.com>
Signed-off-by: Michal Kubecek <mkubecek@...e.cz>
---
netlink/settings.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 92 insertions(+)
diff --git a/netlink/settings.c b/netlink/settings.c
index dc9280c114b5..90c28b1bc424 100644
--- a/netlink/settings.c
+++ b/netlink/settings.c
@@ -1115,6 +1115,93 @@ static const struct param_parser sset_params[] = {
*/
#define SSET_MAX_MSGS 4
+static int linkmodes_reply_advert_all_cb(const struct nlmsghdr *nlhdr,
+ void *data)
+{
+ const struct nlattr *tb[ETHTOOL_A_LINKMODES_MAX + 1] = {};
+ DECLARE_ATTR_TB_INFO(tb);
+ struct nl_msg_buff *req_msgbuff = data;
+ const struct nlattr *ours_attr;
+ struct nlattr *req_bitset;
+ uint32_t *supported_modes;
+ unsigned int modes_count;
+ unsigned int i;
+ int ret;
+
+ ret = mnl_attr_parse(nlhdr, GENL_HDRLEN, attr_cb, &tb_info);
+ if (ret < 0)
+ return MNL_CB_ERROR;
+ ours_attr = tb[ETHTOOL_A_LINKMODES_OURS];
+ if (!ours_attr)
+ return MNL_CB_ERROR;
+ modes_count = bitset_get_count(tb[ETHTOOL_A_LINKMODES_OURS], &ret);
+ if (ret < 0)
+ return MNL_CB_ERROR;
+ supported_modes = get_compact_bitset_mask(tb[ETHTOOL_A_LINKMODES_OURS]);
+ if (!supported_modes)
+ return MNL_CB_ERROR;
+
+ /* keep only "real" link modes */
+ for (i = 0; i < modes_count; i++)
+ if (!lm_class_match(i, LM_CLASS_REAL))
+ supported_modes[i / 32] &= ~((uint32_t)1 << (i % 32));
+
+ req_bitset = ethnla_nest_start(req_msgbuff, ETHTOOL_A_LINKMODES_OURS);
+ if (!req_bitset)
+ return MNL_CB_ERROR;
+
+ if (ethnla_put_u32(req_msgbuff, ETHTOOL_A_BITSET_SIZE, modes_count) ||
+ ethnla_put(req_msgbuff, ETHTOOL_A_BITSET_VALUE,
+ DIV_ROUND_UP(modes_count, 32) * sizeof(uint32_t),
+ supported_modes) ||
+ ethnla_put(req_msgbuff, ETHTOOL_A_BITSET_MASK,
+ DIV_ROUND_UP(modes_count, 32) * sizeof(uint32_t),
+ supported_modes)) {
+ ethnla_nest_cancel(req_msgbuff, req_bitset);
+ return MNL_CB_ERROR;
+ }
+
+ ethnla_nest_end(req_msgbuff, req_bitset);
+ return MNL_CB_OK;
+}
+
+/* For compatibility reasons with ioctl-based ethtool, when "autoneg on" is
+ * specified without "advertise", "speed" and "duplex", we need to query the
+ * supported link modes from the kernel and advertise all the "real" ones.
+ */
+static int nl_sset_compat_linkmodes(struct nl_context *nlctx,
+ struct nl_msg_buff *msgbuff)
+{
+ const struct nlattr *tb[ETHTOOL_A_LINKMODES_MAX + 1] = {};
+ DECLARE_ATTR_TB_INFO(tb);
+ struct nl_socket *nlsk = nlctx->ethnl_socket;
+ int ret;
+
+ ret = mnl_attr_parse(msgbuff->nlhdr, GENL_HDRLEN, attr_cb, &tb_info);
+ if (ret < 0)
+ return ret;
+ if (!tb[ETHTOOL_A_LINKMODES_AUTONEG] || tb[ETHTOOL_A_LINKMODES_OURS] ||
+ tb[ETHTOOL_A_LINKMODES_SPEED] || tb[ETHTOOL_A_LINKMODES_DUPLEX])
+ return 0;
+ if (!mnl_attr_get_u8(tb[ETHTOOL_A_LINKMODES_AUTONEG]))
+ return 0;
+
+ /* all conditions satisfied, create ETHTOOL_A_LINKMODES_OURS */
+ if (netlink_cmd_check(nlctx->ctx, ETHTOOL_MSG_LINKMODES_GET, false) ||
+ netlink_cmd_check(nlctx->ctx, ETHTOOL_MSG_LINKMODES_SET, false))
+ return -EOPNOTSUPP;
+ ret = nlsock_prep_get_request(nlsk, ETHTOOL_MSG_LINKMODES_GET,
+ ETHTOOL_A_LINKMODES_HEADER,
+ ETHTOOL_FLAG_COMPACT_BITSETS);
+ if (ret < 0)
+ return ret;
+ ret = nlsock_sendmsg(nlsk, NULL);
+ if (ret < 0)
+ return ret;
+ return nlsock_process_reply(nlsk, linkmodes_reply_advert_all_cb,
+ msgbuff);
+}
+
int nl_sset(struct cmd_context *ctx)
{
struct nl_msg_buff *msgbuffs[SSET_MAX_MSGS] = {};
@@ -1136,6 +1223,11 @@ int nl_sset(struct cmd_context *ctx)
for (i = 0; i < SSET_MAX_MSGS && msgbuffs[i]; i++) {
struct nl_socket *nlsk = nlctx->ethnl_socket;
+ if (msgbuffs[i]->genlhdr->cmd == ETHTOOL_MSG_LINKMODES_SET) {
+ ret = nl_sset_compat_linkmodes(nlctx, msgbuffs[i]);
+ if (ret < 0)
+ goto out_free;
+ }
ret = nlsock_sendmsg(nlsk, msgbuffs[i]);
if (ret < 0)
goto out_free;
--
2.29.2
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