FAILED: patch "[PATCH] virtio_net: Do not send RSS key if it is not supported" failed to apply to 6.6-stable tree

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 059a49aa2e25c58f90b50151f109dd3c4cdb3a47
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2024041412-subduing-brewing-cd04@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

059a49aa2e25 ("virtio_net: Do not send RSS key if it is not supported") fb6e30a72539 ("net: ethtool: pass a pointer to parameters to get/set_rxfh ethtool ops") 02cbfba1add5 ("idpf: add ethtool callbacks")
a5ab9ee0df0b ("idpf: add singleq start_xmit and napi poll")
3a8845af66ed ("idpf: add RX splitq napi poll support")
c2d548cad150 ("idpf: add TX splitq napi poll support")
6818c4d5b3c2 ("idpf: add splitq start_xmit")
d4d558718266 ("idpf: initialize interrupts and enable vport") 95af467d9a4e ("idpf: configure resources for RX queues")
1c325aac10a8 ("idpf: configure resources for TX queues")
ce1b75d0635c ("idpf: add ptypes and MAC filter support")
0fe45467a104 ("idpf: add create vport and netdev configuration") 4930fbf419a7 ("idpf: add core init and interrupt request")
8077c727561a ("idpf: add controlq init and reset checks")
e850efed5e15 ("idpf: add module register and probe functionality")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 059a49aa2e25c58f90b50151f109dd3c4cdb3a47 Mon Sep 17 00:00:00 2001
From: Breno Leitao <[email protected]>
Date: Wed, 3 Apr 2024 08:43:12 -0700
Subject: [PATCH] virtio_net: Do not send RSS key if it is not supported

There is a bug when setting the RSS options in virtio_net that can break the whole machine, getting the kernel into an infinite loop.

Running the following command in any QEMU virtual machine with virtionet will reproduce this problem:

    # ethtool -X eth0  hfunc toeplitz

This is how the problem happens:

1) ethtool_set_rxfh() calls virtnet_set_rxfh()

2) virtnet_set_rxfh() calls virtnet_commit_rss_command()

3) virtnet_commit_rss_command() populates 4 entries for the rss scatter-gather

4) Since the command above does not have a key, then the last scatter-gatter entry will be zeroed, since rss_key_size == 0. sg_buf_size = vi->rss_key_size;

5) This buffer is passed to qemu, but qemu is not happy with a buffer with zero length, and do the following in virtqueue_map_desc() (QEMU function):

  if (!sz) {
      virtio_error(vdev, "virtio: zero sized buffers are not allowed");

6) virtio_error() (also QEMU function) set the device as broken

    vdev->broken = true;

7) Qemu bails out, and do not repond this crazy kernel.

8) The kernel is waiting for the response to come back (function virtnet_send_command())

9) The kernel is waiting doing the following :

      while (!virtqueue_get_buf(vi->cvq, &tmp) &&
	     !virtqueue_is_broken(vi->cvq))
	      cpu_relax();

10) None of the following functions above is true, thus, the kernel loops here forever. Keeping in mind that virtqueue_is_broken() does not look at the qemu vdev->broken, so, it never realizes that the vitio is broken at QEMU side.

Fix it by not sending RSS commands if the feature is not available in the device.

index c22d1118a133..115c3c5414f2 100644
@@ -3807,6 +3807,7 @@ static int virtnet_set_rxfh(struct net_device *dev,
 			    struct netlink_ext_ack *extack)
 {
 	struct virtnet_info *vi = netdev_priv(dev);
+	bool update = false;
 	int i;
 
 	if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE &&

@@ -3814,13 +3815,28 @@ static int virtnet_set_rxfh(struct net_device *dev,
 		return -EOPNOTSUPP;
 
 	if (rxfh->indir) {
+		if (!vi->has_rss)
+			return -EOPNOTSUPP;
+
 		for (i = 0; i < vi->rss_indir_table_size; ++i)
 			vi->ctrl->rss.indirection_table[i] = rxfh->indir[i];
+		update = true;
 	}
-	if (rxfh->key)
-		memcpy(vi->ctrl->rss.key, rxfh->key, vi->rss_key_size);
 
-	virtnet_commit_rss_command(vi);
+	if (rxfh->key) {
+		/* If either _F_HASH_REPORT or _F_RSS are negotiated, the
+		 * device provides hash calculation capabilities, that is,
+		 * hash_key is configured.
+		 */
+		if (!vi->has_rss && !vi->has_rss_hash_report)
+			return -EOPNOTSUPP;
+
+		memcpy(vi->ctrl->rss.key, rxfh->key, vi->rss_key_size);
+		update = true;
+	}
+
+	if (update)
+		virtnet_commit_rss_command(vi);
 
 	return 0;
 }

@@ -4729,13 +4745,15 @@ static int virtnet_probe(struct virtio_device *vdev)
 	if (virtio_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT))
 		vi->has_rss_hash_report = true;
 
-	if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS))
+	if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) {
 		vi->has_rss = true;
 
-	if (vi->has_rss || vi->has_rss_hash_report) {
 		vi->rss_indir_table_size =
 			virtio_cread16(vdev, offsetof(struct virtio_net_config,
 				rss_max_indirection_table_length));
+	}
+
+	if (vi->has_rss || vi->has_rss_hash_report) {
 		vi->rss_key_size =
 			virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size));
 

From: Breno Leitao <[email protected]>

commit 059a49aa2e25c58f90b50151f109dd3c4cdb3a47 upstream.

There is a bug when setting the RSS options in virtio_net that can break the whole machine, getting the kernel into an infinite loop.

Running the following command in any QEMU virtual machine with virtionet will reproduce this problem:

    # ethtool -X eth0  hfunc toeplitz

This is how the problem happens:

1) ethtool_set_rxfh() calls virtnet_set_rxfh()

2) virtnet_set_rxfh() calls virtnet_commit_rss_command()

3) virtnet_commit_rss_command() populates 4 entries for the rss scatter-gather

4) Since the command above does not have a key, then the last scatter-gatter entry will be zeroed, since rss_key_size == 0. sg_buf_size = vi->rss_key_size;

5) This buffer is passed to qemu, but qemu is not happy with a buffer with zero length, and do the following in virtqueue_map_desc() (QEMU function):

  if (!sz) {
      virtio_error(vdev, "virtio: zero sized buffers are not allowed");

6) virtio_error() (also QEMU function) set the device as broken

    vdev->broken = true;

7) Qemu bails out, and do not repond this crazy kernel.

8) The kernel is waiting for the response to come back (function virtnet_send_command())

9) The kernel is waiting doing the following :

      while (!virtqueue_get_buf(vi->cvq, &tmp) &&
	     !virtqueue_is_broken(vi->cvq))
	      cpu_relax();

10) None of the following functions above is true, thus, the kernel loops here forever. Keeping in mind that virtqueue_is_broken() does not look at the qemu vdev->broken, so, it never realizes that the vitio is broken at QEMU side.

Fix it by not sending RSS commands if the feature is not available in the device.

---
 drivers/net/virtio_net.c | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

index 7cb0548d17a3..56cbe00126bb 100644
@@ -3570,19 +3570,34 @@ static int virtnet_get_rxfh(struct net_device *dev, u32 *indir, u8 *key, u8 *hfu
 static int virtnet_set_rxfh(struct net_device *dev, const u32 *indir, const u8 *key, const u8 hfunc)
 {
 	struct virtnet_info *vi = netdev_priv(dev);
+	bool update = false;
 	int i;
 
 	if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
 		return -EOPNOTSUPP;
 
 	if (indir) {
+		if (!vi->has_rss)
+			return -EOPNOTSUPP;
+
 		for (i = 0; i < vi->rss_indir_table_size; ++i)
 			vi->ctrl->rss.indirection_table[i] = indir[i];
+		update = true;
 	}
-	if (key)
+	if (key) {
+		/* If either _F_HASH_REPORT or _F_RSS are negotiated, the
+		 * device provides hash calculation capabilities, that is,
+		 * hash_key is configured.
+		 */
+		if (!vi->has_rss && !vi->has_rss_hash_report)
+			return -EOPNOTSUPP;
+
 		memcpy(vi->ctrl->rss.key, key, vi->rss_key_size);
+		update = true;
+	}
 
-	virtnet_commit_rss_command(vi);
+	if (update)
+		virtnet_commit_rss_command(vi);
 
 	return 0;
 }

@@ -4491,13 +4506,15 @@ static int virtnet_probe(struct virtio_device *vdev)
 	if (virtio_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT))
 		vi->has_rss_hash_report = true;
 
-	if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS))
+	if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) {
 		vi->has_rss = true;
 
-	if (vi->has_rss || vi->has_rss_hash_report) {
 		vi->rss_indir_table_size =
 			virtio_cread16(vdev, offsetof(struct virtio_net_config,
 				rss_max_indirection_table_length));
+	}
+
+	if (vi->has_rss || vi->has_rss_hash_report) {
 		vi->rss_key_size =
 			virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size));
 

2.43.0

Now queued up, thanks.

greg k-h