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Miller" , Eric Dumazet , Paolo Abeni , Simon Horman , Andrew Lunn , Xuan Zhuo , Stanislav Fomichev , Mina Almasry , Daniel Jurgens , Martin Karsten , linux-kernel@vger.kernel.org (open list) Subject: [PATCH net-next v3 1/2] netdev-genl: Add an XSK attribute to queues Date: Tue, 4 Feb 2025 19:10:47 +0000 Message-ID: <20250204191108.161046-2-jdamato@fastly.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250204191108.161046-1-jdamato@fastly.com> References: <20250204191108.161046-1-jdamato@fastly.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Expose a new per-queue nest attribute, xsk, which will be present for queues that are being used for AF_XDP. If the queue is not being used for AF_XDP, the nest will not be present. In the future, this attribute can be extended to include more data about XSK as it is needed. Signed-off-by: Joe Damato Suggested-by: Jakub Kicinski --- v2: - Patch adjusted to include an attribute, xsk, which is an empty nest and exposed for queues which have a pool. Documentation/netlink/specs/netdev.yaml | 13 ++++++++++++- include/uapi/linux/netdev.h | 6 ++++++ net/core/netdev-genl.c | 11 +++++++++++ tools/include/uapi/linux/netdev.h | 6 ++++++ 4 files changed, 35 insertions(+), 1 deletion(-) diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlin= k/specs/netdev.yaml index cbb544bd6c84..4c3eda5ba754 100644 --- a/Documentation/netlink/specs/netdev.yaml +++ b/Documentation/netlink/specs/netdev.yaml @@ -268,6 +268,9 @@ attribute-sets: doc: The timeout, in nanoseconds, of how long to suspend irq processing, if event polling finds events type: uint + - + name: xsk-info + attributes: [] - name: queue attributes: @@ -286,6 +289,9 @@ attribute-sets: - name: type doc: Queue type as rx, tx. Each queue type defines a separate ID s= pace. + XDP TX queues allocated in the kernel are not linked to NAPIs= and + thus not listed. AF_XDP queues will have more information set= in + the xsk attribute. type: u32 enum: queue-type - @@ -296,7 +302,11 @@ attribute-sets: name: dmabuf doc: ID of the dmabuf attached to this queue, if any. type: u32 - + - + name: xsk + doc: XSK information for this queue, if any. + type: nest + nested-attributes: xsk-info - name: qstats doc: | @@ -637,6 +647,7 @@ operations: - napi-id - ifindex - dmabuf + - xsk dump: request: attributes: diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h index e4be227d3ad6..46bdb0b67a39 100644 --- a/include/uapi/linux/netdev.h +++ b/include/uapi/linux/netdev.h @@ -130,12 +130,18 @@ enum { NETDEV_A_NAPI_MAX =3D (__NETDEV_A_NAPI_MAX - 1) }; =20 +enum { + __NETDEV_A_XSK_INFO_MAX, + NETDEV_A_XSK_INFO_MAX =3D (__NETDEV_A_XSK_INFO_MAX - 1) +}; + enum { NETDEV_A_QUEUE_ID =3D 1, NETDEV_A_QUEUE_IFINDEX, NETDEV_A_QUEUE_TYPE, NETDEV_A_QUEUE_NAPI_ID, NETDEV_A_QUEUE_DMABUF, + NETDEV_A_QUEUE_XSK, =20 __NETDEV_A_QUEUE_MAX, NETDEV_A_QUEUE_MAX =3D (__NETDEV_A_QUEUE_MAX - 1) diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c index 715f85c6b62e..efaccfb6438e 100644 --- a/net/core/netdev-genl.c +++ b/net/core/netdev-genl.c @@ -371,6 +371,7 @@ netdev_nl_queue_fill_one(struct sk_buff *rsp, struct ne= t_device *netdev, struct net_devmem_dmabuf_binding *binding; struct netdev_rx_queue *rxq; struct netdev_queue *txq; + struct nlattr *nest; void *hdr; =20 hdr =3D genlmsg_iput(rsp, info); @@ -394,12 +395,22 @@ netdev_nl_queue_fill_one(struct sk_buff *rsp, struct = net_device *netdev, nla_put_u32(rsp, NETDEV_A_QUEUE_DMABUF, binding->id)) goto nla_put_failure; =20 + if (rxq->pool) { + nest =3D nla_nest_start(rsp, NETDEV_A_QUEUE_XSK); + nla_nest_end(rsp, nest); + } + break; case NETDEV_QUEUE_TYPE_TX: txq =3D netdev_get_tx_queue(netdev, q_idx); if (txq->napi && nla_put_u32(rsp, NETDEV_A_QUEUE_NAPI_ID, txq->napi->napi_id)) goto nla_put_failure; + + if (txq->pool) { + nest =3D nla_nest_start(rsp, NETDEV_A_QUEUE_XSK); + nla_nest_end(rsp, nest); + } } =20 genlmsg_end(rsp, hdr); diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/n= etdev.h index e4be227d3ad6..46bdb0b67a39 100644 --- a/tools/include/uapi/linux/netdev.h +++ b/tools/include/uapi/linux/netdev.h @@ -130,12 +130,18 @@ enum { NETDEV_A_NAPI_MAX =3D (__NETDEV_A_NAPI_MAX - 1) }; =20 +enum { + __NETDEV_A_XSK_INFO_MAX, + NETDEV_A_XSK_INFO_MAX =3D (__NETDEV_A_XSK_INFO_MAX - 1) +}; + enum { NETDEV_A_QUEUE_ID =3D 1, NETDEV_A_QUEUE_IFINDEX, NETDEV_A_QUEUE_TYPE, NETDEV_A_QUEUE_NAPI_ID, NETDEV_A_QUEUE_DMABUF, + NETDEV_A_QUEUE_XSK, =20 __NETDEV_A_QUEUE_MAX, NETDEV_A_QUEUE_MAX =3D (__NETDEV_A_QUEUE_MAX - 1) --=20 2.43.0