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From: David Wei <[email protected]>
To: [email protected], [email protected]
Cc: Jens Axboe <[email protected]>,
	Pavel Begunkov <[email protected]>,
	Jakub Kicinski <[email protected]>, Paolo Abeni <[email protected]>,
	"David S. Miller" <[email protected]>,
	Eric Dumazet <[email protected]>,
	Jesper Dangaard Brouer <[email protected]>,
	David Ahern <[email protected]>,
	Mina Almasry <[email protected]>
Subject: [RFC PATCH v4 08/16] io_uring: setup ZC for an Rx queue when registering an ifq
Date: Tue, 12 Mar 2024 14:44:22 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

From: David Wei <[email protected]>

RFC only, not for upstream

Just as with the previous patch, it will be migrated from ndo_bpf

This patch sets up ZC for an Rx queue in a net device when an ifq is
registered with io_uring. The Rx queue is specified in the registration
struct.

For now since there is only one ifq, its destruction is implicit during
io_uring cleanup.

Signed-off-by: David Wei <[email protected]>
---
 io_uring/zc_rx.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/io_uring/zc_rx.c b/io_uring/zc_rx.c
index 6987bb991418..521eeea04f9d 100644
--- a/io_uring/zc_rx.c
+++ b/io_uring/zc_rx.c
@@ -4,6 +4,7 @@
 #include <linux/errno.h>
 #include <linux/mm.h>
 #include <linux/io_uring.h>
+#include <linux/netdevice.h>
 
 #include <uapi/linux/io_uring.h>
 
@@ -11,6 +12,34 @@
 #include "kbuf.h"
 #include "zc_rx.h"
 
+typedef int (*bpf_op_t)(struct net_device *dev, struct netdev_bpf *bpf);
+
+static int __io_queue_mgmt(struct net_device *dev, struct io_zc_rx_ifq *ifq,
+			   u16 queue_id)
+{
+	struct netdev_bpf cmd;
+	bpf_op_t ndo_bpf;
+
+	ndo_bpf = dev->netdev_ops->ndo_bpf;
+	if (!ndo_bpf)
+		return -EINVAL;
+
+	cmd.command = XDP_SETUP_ZC_RX;
+	cmd.zc_rx.ifq = ifq;
+	cmd.zc_rx.queue_id = queue_id;
+	return ndo_bpf(dev, &cmd);
+}
+
+static int io_open_zc_rxq(struct io_zc_rx_ifq *ifq)
+{
+	return __io_queue_mgmt(ifq->dev, ifq, ifq->if_rxq_id);
+}
+
+static int io_close_zc_rxq(struct io_zc_rx_ifq *ifq)
+{
+	return __io_queue_mgmt(ifq->dev, NULL, ifq->if_rxq_id);
+}
+
 static int io_allocate_rbuf_ring(struct io_zc_rx_ifq *ifq,
 				 struct io_uring_zc_rx_ifq_reg *reg)
 {
@@ -49,6 +78,10 @@ static struct io_zc_rx_ifq *io_zc_rx_ifq_alloc(struct io_ring_ctx *ctx)
 
 static void io_zc_rx_ifq_free(struct io_zc_rx_ifq *ifq)
 {
+	if (ifq->if_rxq_id != -1)
+		io_close_zc_rxq(ifq);
+	if (ifq->dev)
+		dev_put(ifq->dev);
 	io_free_rbuf_ring(ifq);
 	kfree(ifq);
 }
@@ -79,9 +112,18 @@ int io_register_zc_rx_ifq(struct io_ring_ctx *ctx,
 	if (ret)
 		goto err;
 
+	ret = -ENODEV;
+	ifq->dev = dev_get_by_index(current->nsproxy->net_ns, reg.if_idx);
+	if (!ifq->dev)
+		goto err;
+
 	ifq->rq_entries = reg.rq_entries;
 	ifq->if_rxq_id = reg.if_rxq_id;
 
+	ret = io_open_zc_rxq(ifq);
+	if (ret)
+		goto err;
+
 	ring_sz = sizeof(struct io_uring);
 	rqes_sz = sizeof(struct io_uring_rbuf_rqe) * ifq->rq_entries;
 	reg.mmap_sz = ring_sz + rqes_sz;
@@ -90,6 +132,7 @@ int io_register_zc_rx_ifq(struct io_ring_ctx *ctx,
 	reg.rq_off.tail = offsetof(struct io_uring, tail);
 
 	if (copy_to_user(arg, &reg, sizeof(reg))) {
+		io_close_zc_rxq(ifq);
 		ret = -EFAULT;
 		goto err;
 	}
-- 
2.43.0


  parent reply	other threads:[~2024-03-12 21:44 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-12 21:44 [RFC PATCH v4 00/16] Zero copy Rx using io_uring David Wei
2024-03-12 21:44 ` [RFC PATCH v4 01/16] net: generalise pp provider params passing David Wei
2024-03-12 21:44 ` [RFC PATCH v4 02/16] io_uring: delayed cqe commit David Wei
2024-03-12 21:44 ` [RFC PATCH v4 03/16] net: page_pool: add ->scrub mem provider callback David Wei
2024-03-12 21:44 ` [RFC PATCH v4 04/16] io_uring: separate header for exported net bits David Wei
2024-03-12 21:44 ` [RFC PATCH v4 05/16] io_uring: introduce interface queue David Wei
2024-03-12 21:44 ` [RFC PATCH v4 06/16] io_uring: add mmap support for shared ifq ringbuffers David Wei
2024-03-12 21:44 ` [RFC PATCH v4 07/16] netdev: add XDP_SETUP_ZC_RX command David Wei
2024-03-12 21:44 ` David Wei [this message]
2024-03-12 21:44 ` [RFC PATCH v4 09/16] io_uring/zcrx: implement socket registration David Wei
2024-03-12 21:44 ` [RFC PATCH v4 10/16] io_uring: add zero copy buf representation and pool David Wei
2024-03-12 21:44 ` [RFC PATCH v4 11/16] io_uring: implement pp memory provider for zc rx David Wei
2024-03-12 21:44 ` [RFC PATCH v4 12/16] io_uring/zcrx: implement PP_FLAG_DMA_* handling David Wei
2024-03-12 21:44 ` [RFC PATCH v4 13/16] io_uring: add io_recvzc request David Wei
2024-03-13 20:25   ` Jens Axboe
2024-03-13 20:26     ` Pavel Begunkov
2024-03-13 21:03       ` Jens Axboe
2024-03-14 16:14       ` Jens Axboe
2024-03-15 17:34         ` Pavel Begunkov
2024-03-15 18:38           ` Jens Axboe
2024-03-15 23:52             ` Pavel Begunkov
2024-03-16 16:59               ` Jens Axboe
2024-03-17 21:22                 ` Pavel Begunkov
2024-03-17 21:30                   ` Jens Axboe
2024-03-12 21:44 ` [RFC PATCH v4 14/16] net: execute custom callback from napi David Wei
2024-03-12 21:44 ` [RFC PATCH v4 15/16] io_uring/zcrx: add copy fallback David Wei
2024-03-12 21:44 ` [RFC PATCH v4 16/16] veth: add support for io_uring zc rx David Wei

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