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Message-ID: <20240305020153.2787423-5-almasrymina@google.com>
Date: Mon, 4 Mar 2024 18:01:39 -0800
From: Mina Almasry <almasrymina@...gle.com>
To: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org, linux-alpha@...r.kernel.org,
linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
sparclinux@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
linux-arch@...r.kernel.org, bpf@...r.kernel.org,
linux-kselftest@...r.kernel.org, linux-media@...r.kernel.org,
dri-devel@...ts.freedesktop.org
Cc: Mina Almasry <almasrymina@...gle.com>, "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Jonathan Corbet <corbet@....net>, Richard Henderson <richard.henderson@...aro.org>,
Ivan Kokshaysky <ink@...assic.park.msu.ru>, Matt Turner <mattst88@...il.com>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>, Helge Deller <deller@....de>,
Andreas Larsson <andreas@...sler.com>, Jesper Dangaard Brouer <hawk@...nel.org>,
Ilias Apalodimas <ilias.apalodimas@...aro.org>, Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Arnd Bergmann <arnd@...db.de>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>,
Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>,
Yonghong Song <yonghong.song@...ux.dev>, John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>,
Jiri Olsa <jolsa@...nel.org>, David Ahern <dsahern@...nel.org>,
Willem de Bruijn <willemdebruijn.kernel@...il.com>, Shuah Khan <shuah@...nel.org>,
Sumit Semwal <sumit.semwal@...aro.org>,
"Christian König" <christian.koenig@....com>, Pavel Begunkov <asml.silence@...il.com>,
David Wei <dw@...idwei.uk>, Jason Gunthorpe <jgg@...pe.ca>, Yunsheng Lin <linyunsheng@...wei.com>,
Shailend Chand <shailend@...gle.com>, Harshitha Ramamurthy <hramamurthy@...gle.com>,
Shakeel Butt <shakeelb@...gle.com>, Jeroen de Borst <jeroendb@...gle.com>,
Praveen Kaligineedi <pkaligineedi@...gle.com>
Subject: [RFC PATCH net-next v6 04/15] net: netdev netlink api to bind dma-buf
to a net device
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@...gle.com>
Signed-off-by: Mina Almasry <almasrymina@...gle.com>
---
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 | 52 +++++++++++++++++++++++++
include/uapi/linux/netdev.h | 19 +++++++++
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 | 19 +++++++++
6 files changed, 117 insertions(+)
diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml
index 3addac970680..6f235fd7b14d 100644
--- a/Documentation/netlink/specs/netdev.yaml
+++ b/Documentation/netlink/specs/netdev.yaml
@@ -264,6 +264,45 @@ attribute-sets:
name: napi-id
doc: ID of the NAPI instance which services this queue.
type: u32
+ -
+ name: queue-dmabuf
+ attributes:
+ -
+ name: type
+ doc: rx or tx queue
+ type: u8
+ enum: queue-type
+ -
+ name: idx
+ doc: queue index
+ type: u32
+
+ -
+ name: bind-dmabuf
+ attributes:
+ -
+ name: ifindex
+ doc: netdev ifindex to bind the dma-buf to.
+ type: u32
+ checks:
+ min: 1
+ -
+ name: queues
+ doc: receive queues to bind the dma-buf to.
+ type: nest
+ nested-attributes: queue-dmabuf
+ multi-attr: true
+ -
+ name: dmabuf-fd
+ doc: dmabuf file descriptor to bind.
+ type: u32
+ -
+ name: dmabuf-id
+ doc: id of the dmabuf binding
+ type: u32
+ checks:
+ min: 1
+
operations:
list:
@@ -386,6 +425,19 @@ operations:
attributes:
- ifindex
reply: *queue-get-op
+ -
+ name: bind-rx
+ doc: Bind dmabuf to netdev
+ attribute-set: bind-dmabuf
+ do:
+ request:
+ attributes:
+ - ifindex
+ - dmabuf-fd
+ - queues
+ reply:
+ attributes:
+ - dmabuf-id
-
name: napi-get
doc: Get information about NAPI instances configured on the system.
diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h
index 93cb411adf72..6a5cd4af68c8 100644
--- a/include/uapi/linux/netdev.h
+++ b/include/uapi/linux/netdev.h
@@ -132,6 +132,24 @@ enum {
NETDEV_A_QUEUE_MAX = (__NETDEV_A_QUEUE_MAX - 1)
};
+enum {
+ NETDEV_A_QUEUE_DMABUF_TYPE = 1,
+ NETDEV_A_QUEUE_DMABUF_IDX,
+
+ __NETDEV_A_QUEUE_DMABUF_MAX,
+ NETDEV_A_QUEUE_DMABUF_MAX = (__NETDEV_A_QUEUE_DMABUF_MAX - 1)
+};
+
+enum {
+ NETDEV_A_BIND_DMABUF_IFINDEX = 1,
+ NETDEV_A_BIND_DMABUF_QUEUES,
+ NETDEV_A_BIND_DMABUF_DMABUF_FD,
+ NETDEV_A_BIND_DMABUF_DMABUF_ID,
+
+ __NETDEV_A_BIND_DMABUF_MAX,
+ NETDEV_A_BIND_DMABUF_MAX = (__NETDEV_A_BIND_DMABUF_MAX - 1)
+};
+
enum {
NETDEV_CMD_DEV_GET = 1,
NETDEV_CMD_DEV_ADD_NTF,
@@ -143,6 +161,7 @@ enum {
NETDEV_CMD_PAGE_POOL_CHANGE_NTF,
NETDEV_CMD_PAGE_POOL_STATS_GET,
NETDEV_CMD_QUEUE_GET,
+ NETDEV_CMD_BIND_RX,
NETDEV_CMD_NAPI_GET,
__NETDEV_CMD_MAX,
diff --git a/net/core/netdev-genl-gen.c b/net/core/netdev-genl-gen.c
index be7f2ebd61b2..3384b1ae3f40 100644
--- a/net/core/netdev-genl-gen.c
+++ b/net/core/netdev-genl-gen.c
@@ -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_dmabuf_nl_policy[NETDEV_A_QUEUE_DMABUF_IDX + 1] = {
+ [NETDEV_A_QUEUE_DMABUF_TYPE] = NLA_POLICY_MAX(NLA_U8, 1),
+ [NETDEV_A_QUEUE_DMABUF_IDX] = { .type = NLA_U32, },
+};
+
/* 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),
@@ -58,6 +63,13 @@ static const struct nla_policy netdev_queue_get_dump_nl_policy[NETDEV_A_QUEUE_IF
[NETDEV_A_QUEUE_IFINDEX] = NLA_POLICY_MIN(NLA_U32, 1),
};
+/* NETDEV_CMD_BIND_RX - do */
+static const struct nla_policy netdev_bind_rx_nl_policy[NETDEV_A_BIND_DMABUF_DMABUF_FD + 1] = {
+ [NETDEV_A_BIND_DMABUF_IFINDEX] = NLA_POLICY_MIN(NLA_U32, 1),
+ [NETDEV_A_BIND_DMABUF_DMABUF_FD] = { .type = NLA_U32, },
+ [NETDEV_A_BIND_DMABUF_QUEUES] = NLA_POLICY_NESTED(netdev_queue_dmabuf_nl_policy),
+};
+
/* NETDEV_CMD_NAPI_GET - do */
static const struct nla_policy netdev_napi_get_do_nl_policy[NETDEV_A_NAPI_ID + 1] = {
[NETDEV_A_NAPI_ID] = { .type = NLA_U32, },
@@ -124,6 +136,13 @@ static const struct genl_split_ops netdev_nl_ops[] = {
.maxattr = NETDEV_A_QUEUE_IFINDEX,
.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_BIND_DMABUF_DMABUF_FD,
+ .flags = GENL_CMD_CAP_DO,
+ },
{
.cmd = NETDEV_CMD_NAPI_GET,
.doit = netdev_nl_napi_get_doit,
diff --git a/net/core/netdev-genl-gen.h b/net/core/netdev-genl-gen.h
index a47f2bcbe4fa..a7ede514eccd 100644
--- a/net/core/netdev-genl-gen.h
+++ b/net/core/netdev-genl-gen.h
@@ -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_dmabuf_nl_policy[NETDEV_A_QUEUE_DMABUF_IDX + 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);
@@ -26,6 +27,7 @@ int netdev_nl_page_pool_stats_get_dumpit(struct sk_buff *skb,
int netdev_nl_queue_get_doit(struct sk_buff *skb, struct genl_info *info);
int netdev_nl_queue_get_dumpit(struct sk_buff *skb,
struct netlink_callback *cb);
+int netdev_nl_bind_rx_doit(struct sk_buff *skb, struct genl_info *info);
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);
diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
index fd98936da3ae..0ed292d87ae0 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -469,6 +469,12 @@ int netdev_nl_queue_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
return skb->len;
}
+/* 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)
{
diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/netdev.h
index 93cb411adf72..6a5cd4af68c8 100644
--- a/tools/include/uapi/linux/netdev.h
+++ b/tools/include/uapi/linux/netdev.h
@@ -132,6 +132,24 @@ enum {
NETDEV_A_QUEUE_MAX = (__NETDEV_A_QUEUE_MAX - 1)
};
+enum {
+ NETDEV_A_QUEUE_DMABUF_TYPE = 1,
+ NETDEV_A_QUEUE_DMABUF_IDX,
+
+ __NETDEV_A_QUEUE_DMABUF_MAX,
+ NETDEV_A_QUEUE_DMABUF_MAX = (__NETDEV_A_QUEUE_DMABUF_MAX - 1)
+};
+
+enum {
+ NETDEV_A_BIND_DMABUF_IFINDEX = 1,
+ NETDEV_A_BIND_DMABUF_QUEUES,
+ NETDEV_A_BIND_DMABUF_DMABUF_FD,
+ NETDEV_A_BIND_DMABUF_DMABUF_ID,
+
+ __NETDEV_A_BIND_DMABUF_MAX,
+ NETDEV_A_BIND_DMABUF_MAX = (__NETDEV_A_BIND_DMABUF_MAX - 1)
+};
+
enum {
NETDEV_CMD_DEV_GET = 1,
NETDEV_CMD_DEV_ADD_NTF,
@@ -143,6 +161,7 @@ enum {
NETDEV_CMD_PAGE_POOL_CHANGE_NTF,
NETDEV_CMD_PAGE_POOL_STATS_GET,
NETDEV_CMD_QUEUE_GET,
+ NETDEV_CMD_BIND_RX,
NETDEV_CMD_NAPI_GET,
__NETDEV_CMD_MAX,
--
2.44.0.rc1.240.g4c46232300-goog
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