linux-kernel - [RFC PATCH v2 6/7] Revert "virtio_net: big mode skip the unmap check"

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Message-ID: <3db7fcc631c2f1dd6a62e5d90fecf3e5c32ca4e2.1725616135.git.mst@redhat.com>
Date: Fri, 6 Sep 2024 05:52:40 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Jason Wang <jasowang@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	virtualization@...ts.linux.dev, Si-Wei Liu <si-wei.liu@...cle.com>,
	Darren Kenny <darren.kenny@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Eugenio Pérez <eperezma@...hat.com>
Subject: [RFC PATCH v2 6/7] Revert "virtio_net: big mode skip the unmap check"

This reverts commit a377ae542d8d0a20a3173da3bbba72e045bea7a9.

leads to crashes with no ACCESS_PLATFORM when
sysctl net.core.high_order_alloc_disable=1

Cc: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Reported-by: Si-Wei Liu <si-wei.liu@...cle.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 drivers/net/virtio_net.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 0a2ec9570521..6f3c39dc6f76 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -983,7 +983,7 @@ static void virtnet_rq_unmap_free_buf(struct virtqueue *vq, void *buf)
 
 	rq = &vi->rq[i];
 
-	if (!vi->big_packets || vi->mergeable_rx_bufs)
+	if (rq->do_dma)
 		virtnet_rq_unmap(rq, buf, 0);
 
 	virtnet_rq_free_buf(vi, rq, buf);
@@ -2367,7 +2367,7 @@ static int virtnet_receive(struct receive_queue *rq, int budget,
 		}
 	} else {
 		while (packets < budget &&
-		       (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
+		       (buf = virtnet_rq_get_buf(rq, &len, NULL)) != NULL) {
 			receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats);
 			packets++;
 		}
-- 
MST