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Message-ID: <20240910171458.219195-3-almasrymina@google.com>
Date: Tue, 10 Sep 2024 17:14:46 +0000
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>,
Donald Hunter <donald.hunter@...il.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>, Steffen Klassert <steffen.klassert@...unet.com>,
Herbert Xu <herbert@...dor.apana.org.au>, David Ahern <dsahern@...nel.org>,
Willem de Bruijn <willemdebruijn.kernel@...il.com>,
"Björn Töpel" <bjorn@...nel.org>, Magnus Karlsson <magnus.karlsson@...el.com>,
Maciej Fijalkowski <maciej.fijalkowski@...el.com>, Jonathan Lemon <jonathan.lemon@...il.com>,
Shuah Khan <shuah@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>, John Fastabend <john.fastabend@...il.com>,
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 <shakeel.butt@...ux.dev>, Jeroen de Borst <jeroendb@...gle.com>,
Praveen Kaligineedi <pkaligineedi@...gle.com>, Bagas Sanjaya <bagasdotme@...il.com>,
Christoph Hellwig <hch@...radead.org>, Nikolay Aleksandrov <razor@...ckwall.org>, Taehee Yoo <ap420073@...il.com>,
Stanislav Fomichev <sdf@...ichev.me>
Subject: [PATCH net-next v26 02/13] 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@...ichev.me>
Signed-off-by: Mina Almasry <almasrymina@...gle.com>
Reviewed-by: Donald Hunter <donald.hunter@...il.com>
Reviewed-by: Jakub Kicinski <kuba@...nel.org>
---
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(+)
diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml
index 959755be4d7f..4930e8142aa6 100644
--- a/Documentation/netlink/specs/netdev.yaml
+++ b/Documentation/netlink/specs/netdev.yaml
@@ -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:
diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h
index 43742ac5b00d..91bf3ecc5f1d 100644
--- a/include/uapi/linux/netdev.h
+++ b/include/uapi/linux/netdev.h
@@ -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)
diff --git a/net/core/netdev-genl-gen.c b/net/core/netdev-genl-gen.c
index 8350a0afa9ec..6b7fe6035067 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_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[] = {
diff --git a/net/core/netdev-genl-gen.h b/net/core/netdev-genl-gen.h
index 4db40fd5b4a9..67c34005750c 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_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,
diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c
index a17d7eaeb001..699c34b9b03c 100644
--- a/net/core/netdev-genl.c
+++ b/net/core/netdev-genl.c
@@ -723,6 +723,12 @@ 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)
{
diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/netdev.h
index 43742ac5b00d..91bf3ecc5f1d 100644
--- a/tools/include/uapi/linux/netdev.h
+++ b/tools/include/uapi/linux/netdev.h
@@ -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)
--
2.46.0.598.g6f2099f65c-goog
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