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net: dcb: add new pcp selector to app object

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Add new PCP selector for the 8021Qaz APP managed object.

As the PCP selector is not part of the 8021Qaz standard, a new non-std
extension attribute DCB_ATTR_DCB_APP has been introduced. Also two
helper functions to translate between selector and app attribute type
has been added. The new selector has been given a value of 255, to
minimize the risk of future overlap of std- and non-std attributes.

The new DCB_ATTR_DCB_APP is sent alongside the ieee std attribute in the
app table. This means that the dcb_app struct can now both contain std-
and non-std app attributes. Currently there is no overlap between the
selector values of the two attributes.

The purpose of adding the PCP selector, is to be able to offload
PCP-based queue classification to the 8021Q Priority Code Point table,
see 6.9.3 of IEEE Std 802.1Q-2018.

PCP and DEI is encoded in the protocol field as 8*dei+pcp, so that a
mapping of PCP 2 and DEI 1 to priority 3 is encoded as {255, 10, 3}.

Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Daniel Machon 2022-11-01 10:48:29 +01:00 committed by Paolo Abeni
parent 71fa6887ee
commit ec32c0c42d
2 changed files with 60 additions and 4 deletions
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6
include/uapi/linux/dcbnl.h
View file

@ -218,6 +218,9 @@ struct cee_pfc {
#define IEEE_8021QAZ_APP_SEL_ANY 4
#define IEEE_8021QAZ_APP_SEL_DSCP 5
/* Non-std selector values */
#define DCB_APP_SEL_PCP 255
/* This structure contains the IEEE 802.1Qaz APP managed object. This
* object is also used for the CEE std as well.
*
@ -247,6 +250,8 @@ struct dcb_app {
__u16 protocol;
};
#define IEEE_8021QAZ_APP_SEL_MAX 255
/**
* struct dcb_peer_app_info - APP feature information sent by the peer
*
@ -425,6 +430,7 @@ enum ieee_attrs {
enum ieee_attrs_app {
DCB_ATTR_IEEE_APP_UNSPEC,
DCB_ATTR_IEEE_APP,
DCB_ATTR_DCB_APP,
__DCB_ATTR_IEEE_APP_MAX
};
#define DCB_ATTR_IEEE_APP_MAX (__DCB_ATTR_IEEE_APP_MAX - 1)

58
net/dcb/dcbnl.c
View file

@ -179,6 +179,38 @@ static const struct nla_policy dcbnl_featcfg_nest[DCB_FEATCFG_ATTR_MAX + 1] = {
static LIST_HEAD(dcb_app_list);
static DEFINE_SPINLOCK(dcb_lock);
static enum ieee_attrs_app dcbnl_app_attr_type_get(u8 selector)
{
switch (selector) {
case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
case IEEE_8021QAZ_APP_SEL_STREAM:
case IEEE_8021QAZ_APP_SEL_DGRAM:
case IEEE_8021QAZ_APP_SEL_ANY:
case IEEE_8021QAZ_APP_SEL_DSCP:
return DCB_ATTR_IEEE_APP;
case DCB_APP_SEL_PCP:
return DCB_ATTR_DCB_APP;
default:
return DCB_ATTR_IEEE_APP_UNSPEC;
}
}
static bool dcbnl_app_attr_type_validate(enum ieee_attrs_app type)
{
switch (type) {
case DCB_ATTR_IEEE_APP:
case DCB_ATTR_DCB_APP:
return true;
default:
return false;
}
}
static bool dcbnl_app_selector_validate(enum ieee_attrs_app type, u8 selector)
{
return dcbnl_app_attr_type_get(selector) == type;
}
static struct sk_buff *dcbnl_newmsg(int type, u8 cmd, u32 port, u32 seq,
u32 flags, struct nlmsghdr **nlhp)
{
@ -1116,8 +1148,9 @@ static int dcbnl_ieee_fill(struct sk_buff *skb, struct net_device *netdev)
spin_lock_bh(&dcb_lock);
list_for_each_entry(itr, &dcb_app_list, list) {
if (itr->ifindex == netdev->ifindex) {
err = nla_put(skb, DCB_ATTR_IEEE_APP, sizeof(itr->app),
&itr->app);
enum ieee_attrs_app type =
dcbnl_app_attr_type_get(itr->app.selector);
err = nla_put(skb, type, sizeof(itr->app), &itr->app);
if (err) {
spin_unlock_bh(&dcb_lock);
return -EMSGSIZE;
@ -1493,9 +1526,10 @@ static int dcbnl_ieee_set(struct net_device *netdev, struct nlmsghdr *nlh,
int rem;
nla_for_each_nested(attr, ieee[DCB_ATTR_IEEE_APP_TABLE], rem) {
enum ieee_attrs_app type = nla_type(attr);
struct dcb_app *app_data;
if (nla_type(attr) != DCB_ATTR_IEEE_APP)
if (!dcbnl_app_attr_type_validate(type))
continue;
if (nla_len(attr) < sizeof(struct dcb_app)) {
@ -1504,6 +1538,13 @@ static int dcbnl_ieee_set(struct net_device *netdev, struct nlmsghdr *nlh,
}
app_data = nla_data(attr);
if (!dcbnl_app_selector_validate(type,
app_data->selector)) {
err = -EINVAL;
goto err;
}
if (ops->ieee_setapp)
err = ops->ieee_setapp(netdev, app_data);
else
@ -1554,11 +1595,20 @@ static int dcbnl_ieee_del(struct net_device *netdev, struct nlmsghdr *nlh,
int rem;
nla_for_each_nested(attr, ieee[DCB_ATTR_IEEE_APP_TABLE], rem) {
enum ieee_attrs_app type = nla_type(attr);
struct dcb_app *app_data;
if (nla_type(attr) != DCB_ATTR_IEEE_APP)
if (!dcbnl_app_attr_type_validate(type))
continue;
app_data = nla_data(attr);
if (!dcbnl_app_selector_validate(type,
app_data->selector)) {
err = -EINVAL;
goto err;
}
if (ops->ieee_delapp)
err = ops->ieee_delapp(netdev, app_data);
else