patch 'net/gve: delay adding mbuf head to software ring' has been queued to stable release 24.11.7

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 24.11.7

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 07/15/26. 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/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/1982330ded5a226210fd07a14365377fef537f54

Thanks.

Luca Boccassi

---
>From 1982330ded5a226210fd07a14365377fef537f54 Mon Sep 17 00:00:00 2001
From: Joshua Washington <joshwash at google.com>
Date: Wed, 8 Jul 2026 21:07:30 -0700
Subject: [PATCH] net/gve: delay adding mbuf head to software ring

[ upstream commit 1299806ade3afa865cf6a89276f0cde8df61f5e7 ]

The GQ TX datapath was set up to write the mbuf head into the sw_ring
before writing the descriptors. This poses a problem because it's
possible for the packet to be dropped due to lacking the FIFO space to
do a proper TX. In such a case, the packet won't be sent, and will lead
to leaked mbufs in the subsequent segments.

There is also no real reason that the head mbuf must be set in the
sw_ring separately from the others; the mbuf chain is not actually
walked as part of GQ TX.

Fixes: a46583cf43c8 ("net/gve: support Rx/Tx")

Signed-off-by: Joshua Washington <joshwash at google.com>
Reviewed-by: Jasper Tran O'Leary <jtranoleary at google.com>
---
 drivers/net/gve/gve_tx.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/gve/gve_tx.c b/drivers/net/gve/gve_tx.c
index 015ea9646b..2d6a4272cc 100644
--- a/drivers/net/gve/gve_tx.c
+++ b/drivers/net/gve/gve_tx.c
@@ -301,7 +301,6 @@ gve_tx_burst_qpl(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 			(uint32_t)(tx_offload.l2_len + tx_offload.l3_len + tx_offload.l4_len) :
 			tx_pkt->pkt_len;
 
-		sw_ring[sw_id] = tx_pkt;
 		if (!is_fifo_avail(txq, hlen)) {
 			gve_tx_clean(txq);
 			if (!is_fifo_avail(txq, hlen))
@@ -344,13 +343,14 @@ gve_tx_burst_qpl(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 		}
 
 		/* record mbuf in sw_ring for free */
-		for (i = 1; i < first->nb_segs; i++) {
-			sw_id = (sw_id + 1) & mask;
-			tx_pkt = tx_pkt->next;
+		for (i = 0; i < first->nb_segs; i++) {
+			if (!tx_pkt)
+				break;
 			sw_ring[sw_id] = tx_pkt;
+			sw_id = (sw_id + 1) & mask;
+			tx_pkt = tx_pkt->next;
 		}
 
-		sw_id = (sw_id + 1) & mask;
 		tx_id = (tx_id + 1) & mask;
 
 		txq->nb_free -= nb_used;
-- 
2.47.3

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2026-07-13 18:17:05.859771094 +0100
+++ 0007-net-gve-delay-adding-mbuf-head-to-software-ring.patch	2026-07-13 18:17:05.574282834 +0100
@@ -1 +1 @@
-From 1299806ade3afa865cf6a89276f0cde8df61f5e7 Mon Sep 17 00:00:00 2001
+From 1982330ded5a226210fd07a14365377fef537f54 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 1299806ade3afa865cf6a89276f0cde8df61f5e7 ]
+
@@ -17 +18,0 @@
-Cc: stable at dpdk.org
@@ -26 +27 @@
-index 5c73c21b8d..59c82b04ed 100644
+index 015ea9646b..2d6a4272cc 100644