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devlink: Fix cmd_dev_param_set() to check configuration mode 

This patch is fixing a bug, when param set user command includes
configuration mode which is not supported, the tool may not respond
with error if the requested value is 0. In such case
cmd_dev_param_set_cb() won't find the requested configuration mode and
returns ctx->value as initialized (equal 0). Then cmd_dev_param_set()
may find that requested value equals current value and returns success.

Fixing the bug by adding a flag cmode_found which is set only if
cmd_dev_param_set_cb() finds the requested configuration mode.

Fixes: 13925ae9eb ("devlink: Add param command support")
Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
This commit is contained in:
Moshe Shemesh 2021-10-31 08:48:47 +02:00 committed by Stephen Hemminger
parent 7a8b7573a4
commit 047e9ae516
1 changed files with 6 additions and 0 deletions
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6
devlink/devlink.c
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@ -3036,6 +3036,7 @@ static int cmd_dev_param_show_cb(const struct nlmsghdr *nlh, void *data)
struct param_ctx {
struct dl *dl;
int nla_type;
bool cmode_found;
union {
uint8_t vu8;
uint16_t vu16;
@ -3088,6 +3089,7 @@ static int cmd_dev_param_set_cb(const struct nlmsghdr *nlh, void *data)
cmode = mnl_attr_get_u8(nla_value[DEVLINK_ATTR_PARAM_VALUE_CMODE]);
if (cmode == dl->opts.cmode) {
ctx->cmode_found = true;
val_attr = nla_value[DEVLINK_ATTR_PARAM_VALUE_DATA];
switch (nla_type) {
case MNL_TYPE_U8:
@ -3140,6 +3142,10 @@ static int cmd_dev_param_set(struct dl *dl)
err = mnlu_gen_socket_sndrcv(&dl->nlg, nlh, cmd_dev_param_set_cb, &ctx);
if (err)
return err;
if (!ctx.cmode_found) {
pr_err("Configuration mode not supported\n");
return -ENOTSUP;
}
nlh = mnlu_gen_socket_cmd_prepare(&dl->nlg, DEVLINK_CMD_PARAM_SET,
NLM_F_REQUEST | NLM_F_ACK);