@@ -457,6 +457,39 @@ attribute-sets:
Number of times driver re-started accepting send
requests to this queue from the stack.
type: uint
+ -
+ name: queue-id
+ subset-of: queue
+ attributes:
+ -
+ name: id
+ -
+ name: type
+ -
+ name: dmabuf
+ attributes:
+ -
+ name: ifindex
+ doc: netdev ifindex to bind the dmabuf to.
+ type: u32
+ checks:
+ min: 1
+ -
+ name: queues
+ doc: receive queues to bind the dmabuf to.
+ type: nest
+ nested-attributes: queue-id
+ multi-attr: true
+ -
+ name: fd
+ doc: dmabuf file descriptor to bind.
+ type: u32
+ -
+ name: id
+ doc: id of the dmabuf binding
+ type: u32
+ checks:
+ min: 1
operations:
list:
@@ -619,6 +652,20 @@ operations:
- rx-bytes
- tx-packets
- tx-bytes
+ -
+ name: bind-rx
+ doc: Bind dmabuf to netdev
+ attribute-set: dmabuf
+ flags: [ admin-perm ]
+ do:
+ request:
+ attributes:
+ - ifindex
+ - fd
+ - queues
+ reply:
+ attributes:
+ - id
mcast-groups:
list:
@@ -173,6 +173,16 @@ enum {
NETDEV_A_QSTATS_MAX = (__NETDEV_A_QSTATS_MAX - 1)
};
+enum {
+ NETDEV_A_DMABUF_IFINDEX = 1,
+ NETDEV_A_DMABUF_QUEUES,
+ NETDEV_A_DMABUF_FD,
+ NETDEV_A_DMABUF_ID,
+
+ __NETDEV_A_DMABUF_MAX,
+ NETDEV_A_DMABUF_MAX = (__NETDEV_A_DMABUF_MAX - 1)
+};
+
enum {
NETDEV_CMD_DEV_GET = 1,
NETDEV_CMD_DEV_ADD_NTF,
@@ -186,6 +196,7 @@ enum {
NETDEV_CMD_QUEUE_GET,
NETDEV_CMD_NAPI_GET,
NETDEV_CMD_QSTATS_GET,
+ NETDEV_CMD_BIND_RX,
__NETDEV_CMD_MAX,
NETDEV_CMD_MAX = (__NETDEV_CMD_MAX - 1)
@@ -27,6 +27,11 @@ const struct nla_policy netdev_page_pool_info_nl_policy[NETDEV_A_PAGE_POOL_IFIND
[NETDEV_A_PAGE_POOL_IFINDEX] = NLA_POLICY_FULL_RANGE(NLA_U32, &netdev_a_page_pool_ifindex_range),
};
+const struct nla_policy netdev_queue_id_nl_policy[NETDEV_A_QUEUE_TYPE + 1] = {
+ [NETDEV_A_QUEUE_ID] = { .type = NLA_U32, },
+ [NETDEV_A_QUEUE_TYPE] = NLA_POLICY_MAX(NLA_U32, 1),
+};
+
/* NETDEV_CMD_DEV_GET - do */
static const struct nla_policy netdev_dev_get_nl_policy[NETDEV_A_DEV_IFINDEX + 1] = {
[NETDEV_A_DEV_IFINDEX] = NLA_POLICY_MIN(NLA_U32, 1),
@@ -74,6 +79,13 @@ static const struct nla_policy netdev_qstats_get_nl_policy[NETDEV_A_QSTATS_SCOPE
[NETDEV_A_QSTATS_SCOPE] = NLA_POLICY_MASK(NLA_UINT, 0x1),
};
+/* NETDEV_CMD_BIND_RX - do */
+static const struct nla_policy netdev_bind_rx_nl_policy[NETDEV_A_DMABUF_FD + 1] = {
+ [NETDEV_A_DMABUF_IFINDEX] = NLA_POLICY_MIN(NLA_U32, 1),
+ [NETDEV_A_DMABUF_FD] = { .type = NLA_U32, },
+ [NETDEV_A_DMABUF_QUEUES] = NLA_POLICY_NESTED(netdev_queue_id_nl_policy),
+};
+
/* Ops table for netdev */
static const struct genl_split_ops netdev_nl_ops[] = {
{
@@ -151,6 +163,13 @@ static const struct genl_split_ops netdev_nl_ops[] = {
.maxattr = NETDEV_A_QSTATS_SCOPE,
.flags = GENL_CMD_CAP_DUMP,
},
+ {
+ .cmd = NETDEV_CMD_BIND_RX,
+ .doit = netdev_nl_bind_rx_doit,
+ .policy = netdev_bind_rx_nl_policy,
+ .maxattr = NETDEV_A_DMABUF_FD,
+ .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
+ },
};
static const struct genl_multicast_group netdev_nl_mcgrps[] = {
@@ -13,6 +13,7 @@
/* Common nested types */
extern const struct nla_policy netdev_page_pool_info_nl_policy[NETDEV_A_PAGE_POOL_IFINDEX + 1];
+extern const struct nla_policy netdev_queue_id_nl_policy[NETDEV_A_QUEUE_TYPE + 1];
int netdev_nl_dev_get_doit(struct sk_buff *skb, struct genl_info *info);
int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb);
@@ -30,6 +31,7 @@ int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info);
int netdev_nl_napi_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb);
int netdev_nl_qstats_get_dumpit(struct sk_buff *skb,
struct netlink_callback *cb);
+int netdev_nl_bind_rx_doit(struct sk_buff *skb, struct genl_info *info);
enum {
NETDEV_NLGRP_MGMT,
@@ -721,6 +721,12 @@ int netdev_nl_qstats_get_dumpit(struct sk_buff *skb,
return err;
}
+/* Stub */
+int netdev_nl_bind_rx_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ return 0;
+}
+
static int netdev_genl_netdevice_event(struct notifier_block *nb,
unsigned long event, void *ptr)
{
@@ -173,6 +173,16 @@ enum {
NETDEV_A_QSTATS_MAX = (__NETDEV_A_QSTATS_MAX - 1)
};
+enum {
+ NETDEV_A_DMABUF_IFINDEX = 1,
+ NETDEV_A_DMABUF_QUEUES,
+ NETDEV_A_DMABUF_FD,
+ NETDEV_A_DMABUF_ID,
+
+ __NETDEV_A_DMABUF_MAX,
+ NETDEV_A_DMABUF_MAX = (__NETDEV_A_DMABUF_MAX - 1)
+};
+
enum {
NETDEV_CMD_DEV_GET = 1,
NETDEV_CMD_DEV_ADD_NTF,
@@ -186,6 +196,7 @@ enum {
NETDEV_CMD_QUEUE_GET,
NETDEV_CMD_NAPI_GET,
NETDEV_CMD_QSTATS_GET,
+ NETDEV_CMD_BIND_RX,
__NETDEV_CMD_MAX,
NETDEV_CMD_MAX = (__NETDEV_CMD_MAX - 1)
API takes the dma-buf fd as input, and binds it to the netdevice. The user can specify the rx queues to bind the dma-buf to. Suggested-by: Stanislav Fomichev <sdf@google.com> Signed-off-by: Mina Almasry <almasrymina@google.com> --- v16: - Use subset-of: queue queue-id instead of queue-dmabuf (Jakub). - Rename attribute 'bind-dmabuf' to more generic 'dmabuf' (Jakub). - Use 'dmabuf' everywhere instead of mix of 'dma-buf' and 'dmabuf' (Donald). - Remove repetitive 'dmabuf' naming that appeared in some places (Jakub). - Reordered where the new operations went so I don't break the enum UAPI (Jakub). v7: - Use flags: [ admin-perm ] instead of a CAP_NET_ADMIN check. Changes in v1: - Add rx-queue-type to distingish rx from tx (Jakub) - Return dma-buf ID from netlink API (David, Stan) Changes in RFC-v3: - Support binding multiple rx rx-queues --- Documentation/netlink/specs/netdev.yaml | 47 +++++++++++++++++++++++++ include/uapi/linux/netdev.h | 11 ++++++ net/core/netdev-genl-gen.c | 19 ++++++++++ net/core/netdev-genl-gen.h | 2 ++ net/core/netdev-genl.c | 6 ++++ tools/include/uapi/linux/netdev.h | 11 ++++++ 6 files changed, 96 insertions(+)