netdev - [PATCH 22/33] virtio_net: xsk: introduce xsk disable

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Date:   Thu,  2 Feb 2023 19:00:47 +0800
From:   Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Menglong Dong <imagedong@...cent.com>,
        Kuniyuki Iwashima <kuniyu@...zon.com>,
        Petr Machata <petrm@...dia.com>,
        virtualization@...ts.linux-foundation.org, bpf@...r.kernel.org
Subject: [PATCH 22/33] virtio_net: xsk: introduce xsk disable

Introduce virtnet_xsk_pool_disable() for xsk unbind.

Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 drivers/net/virtio/xsk.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/net/virtio/xsk.c b/drivers/net/virtio/xsk.c
index a7e8005233d2..18c0c6e4d501 100644
--- a/drivers/net/virtio/xsk.c
+++ b/drivers/net/virtio/xsk.c
@@ -113,3 +113,32 @@ static int virtnet_xsk_pool_enable(struct net_device *dev,
 			 DMA_TO_DEVICE);
 	return err;
 }
+
+static int virtnet_xsk_pool_disable(struct net_device *dev, u16 qid)
+{
+	struct virtnet_info *vi = netdev_priv(dev);
+	struct receive_queue *rq;
+	struct send_queue *sq;
+	int err1, err2;
+
+	if (qid >= vi->curr_queue_pairs)
+		return -EINVAL;
+
+	sq = &vi->sq[qid];
+	rq = &vi->rq[qid];
+
+	virtio_dma_unmap(&vi->vdev->dev, sq->xsk.hdr_dma_address, vi->hdr_len,
+			 DMA_TO_DEVICE);
+
+	xsk_pool_dma_unmap(sq->xsk.pool, 0);
+
+	rcu_assign_pointer(sq->xsk.pool, NULL);
+
+	/* Sync with the XSK wakeup and with NAPI. */
+	synchronize_net();
+
+	err1 = virtnet_tx_reset(vi, sq);
+	err2 = virtnet_rq_bind_xsk_pool(vi, rq, NULL, NULL);
+
+	return err1 | err2;
+}
-- 
2.32.0.3.g01195cf9f