patch 'vhost: fix build with GCC 12' has been queued to stable release 21.11.3

[Kevin Traynor]

Hi,

FYI, your patch has been queued to stable release 21.11.3

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/01/22. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/kevintraynor/dpdk-stable

This queued commit can be viewed at:
https://github.com/kevintraynor/dpdk-stable/commit/54a98eecdb81d95d958998c3ecb85b20cde03837

Thanks.

Kevin

---
>From 54a98eecdb81d95d958998c3ecb85b20cde03837 Mon Sep 17 00:00:00 2001
From: Maxime Coquelin <maxime.coquelin at redhat.com>
Date: Wed, 5 Oct 2022 22:35:24 +0200
Subject: [PATCH] vhost: fix build with GCC 12
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

[ upstream commit 4226aa9caca9511bf95a093b6ad9c1f8727a4d43 ]

This patch fixes a compilation issue met with GCC 12 on
LoongArch64:

In function ‘mbuf_to_desc’,
    inlined from ‘vhost_enqueue_async_packed’
    inlined from ‘virtio_dev_rx_async_packed’
    inlined from ‘virtio_dev_rx_async_submit_packed’
lib/vhost/virtio_net.c:1159:18: error:
        ‘buf_vec[0].buf_addr’ may be used uninitialized
 1159 |         buf_addr = buf_vec[vec_idx].buf_addr;
      |         ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/vhost/virtio_net.c: In function ‘virtio_dev_rx_async_submit_packed’:
lib/vhost/virtio_net.c:1834:27: note: ‘buf_vec’ declared here
 1834 |         struct buf_vector buf_vec[BUF_VECTOR_MAX];
      |                           ^~~~~~~

It happens because the compiler assumes that 'size'
variable in vhost_enqueue_async_packed could wrap to 0 since
'size' is uint32_t and pkt->pkt_len too.

In practice, it would never happen since 'pkt->pkt_len' is
unlikely to be close to UINT32_MAX, but let's just change
'size' to uint64_t to make the compiler happy without
having to add runtime checks.

This patch also fixes similar patterns in three other
places, including one that also produces similar build
issue on ARM64 in vhost_enqueue_single_packed().

Fixes: 873e8dad6f49 ("vhost: support packed ring in async datapath")

Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
Reviewed-by: David Marchand <david.marchand at redhat.com>
Tested-by: Amit Prakash Shukla <amitprakashs at marvell.com>
---
 lib/vhost/virtio_net.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c
index bf4d75b4bd..64460e3e8c 100644
--- a/lib/vhost/virtio_net.c
+++ b/lib/vhost/virtio_net.c
@@ -600,5 +600,5 @@ fill_vec_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
 static inline int
 reserve_avail_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
-				uint32_t size, struct buf_vector *buf_vec,
+				uint64_t size, struct buf_vector *buf_vec,
 				uint16_t *num_buffers, uint16_t avail_head,
 				uint16_t *nr_vec)
@@ -1070,5 +1070,5 @@ vhost_enqueue_single_packed(struct virtio_net *dev,
 	uint32_t len = 0;
 	uint16_t desc_count;
-	uint32_t size = pkt->pkt_len + sizeof(struct virtio_net_hdr_mrg_rxbuf);
+	uint64_t size = pkt->pkt_len + sizeof(struct virtio_net_hdr_mrg_rxbuf);
 	uint16_t num_buffers = 0;
 	uint32_t buffer_len[vq->size];
@@ -1138,5 +1138,5 @@ virtio_dev_rx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
 
 	for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
-		uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
+		uint64_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
 		uint16_t nr_vec = 0;
 
@@ -1486,5 +1486,5 @@ virtio_dev_rx_async_submit_split(struct virtio_net *dev,
 
 	for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
-		uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
+		uint64_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
 		uint16_t nr_vec = 0;
 
@@ -1576,5 +1576,5 @@ vhost_enqueue_async_packed(struct virtio_net *dev,
 	uint32_t len = 0;
 	uint16_t desc_count = 0;
-	uint32_t size = pkt->pkt_len + sizeof(struct virtio_net_hdr_mrg_rxbuf);
+	uint64_t size = pkt->pkt_len + sizeof(struct virtio_net_hdr_mrg_rxbuf);
 	uint32_t buffer_len[vq->size];
 	uint16_t buffer_buf_id[vq->size];
-- 
2.37.3

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2022-10-25 14:19:00.554242334 +0100
+++ 0089-vhost-fix-build-with-GCC-12.patch	2022-10-25 14:18:58.531798521 +0100
@@ -1 +1 @@
-From 4226aa9caca9511bf95a093b6ad9c1f8727a4d43 Mon Sep 17 00:00:00 2001
+From 54a98eecdb81d95d958998c3ecb85b20cde03837 Mon Sep 17 00:00:00 2001
@@ -8,0 +9,2 @@
+[ upstream commit 4226aa9caca9511bf95a093b6ad9c1f8727a4d43 ]
+
@@ -39 +40,0 @@
-Cc: stable at dpdk.org
@@ -49 +50 @@
-index 8f4d0f0502..6b4a062df3 100644
+index bf4d75b4bd..64460e3e8c 100644
@@ -52 +53 @@
-@@ -788,5 +788,5 @@ fill_vec_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
+@@ -600,5 +600,5 @@ fill_vec_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
@@ -59 +60 @@
-@@ -1278,5 +1278,5 @@ vhost_enqueue_single_packed(struct virtio_net *dev,
+@@ -1070,5 +1070,5 @@ vhost_enqueue_single_packed(struct virtio_net *dev,
@@ -66 +67 @@
-@@ -1346,5 +1346,5 @@ virtio_dev_rx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
+@@ -1138,5 +1138,5 @@ virtio_dev_rx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
@@ -73 +74 @@
-@@ -1690,5 +1690,5 @@ virtio_dev_rx_async_submit_split(struct virtio_net *dev, struct vhost_virtqueue
+@@ -1486,5 +1486,5 @@ virtio_dev_rx_async_submit_split(struct virtio_net *dev,
@@ -80 +81 @@
-@@ -1781,5 +1781,5 @@ vhost_enqueue_async_packed(struct virtio_net *dev,
+@@ -1576,5 +1576,5 @@ vhost_enqueue_async_packed(struct virtio_net *dev,