patch 'net/gve: add DQO Tx descriptor limit' has been queued to stable release 24.11.4

[Kevin Traynor]

Hi,

FYI, your patch has been queued to stable release 24.11.4

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/05/25. 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/952398a7b241ed5a32b604a67f6972a33eb3589b

Thanks.

Kevin

---
>From 952398a7b241ed5a32b604a67f6972a33eb3589b Mon Sep 17 00:00:00 2001
From: Joshua Washington <joshwash at google.com>
Date: Mon, 7 Jul 2025 16:18:09 -0700
Subject: [PATCH] net/gve: add DQO Tx descriptor limit

[ upstream commit f4a70b449bfac5343bf498f4132d5b8da4b0a885 ]

The hardware supports at most 10 data descriptors per MTU-sized segment.
GVE_TX_MAX_DATA_DESCS was defined in the initial implmenentation, but
the descriptor limit was never actually enforced.

Fixes: 4022f9999f56 ("net/gve: support basic Tx data path for DQO")

Signed-off-by: Joshua Washington <joshwash at google.com>
Reviewed-by: Ankit Garg <nktgrg at google.com>
---
 drivers/net/gve/gve_ethdev.c | 1 +
 drivers/net/gve/gve_ethdev.h | 1 +
 drivers/net/gve/gve_tx_dqo.c | 6 ++++++
 3 files changed, 8 insertions(+)

diff --git a/drivers/net/gve/gve_ethdev.c b/drivers/net/gve/gve_ethdev.c
index e471a34e61..5be4f64fde 100644
--- a/drivers/net/gve/gve_ethdev.c
+++ b/drivers/net/gve/gve_ethdev.c
@@ -604,4 +604,5 @@ gve_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 		.nb_min = priv->min_tx_desc_cnt,
 		.nb_align = 1,
+		.nb_mtu_seg_max = GVE_TX_MAX_DATA_DESCS,
 	};
 
diff --git a/drivers/net/gve/gve_ethdev.h b/drivers/net/gve/gve_ethdev.h
index 35cb9062b1..195dadc4d4 100644
--- a/drivers/net/gve/gve_ethdev.h
+++ b/drivers/net/gve/gve_ethdev.h
@@ -103,4 +103,5 @@ struct gve_tx_stats {
 	uint64_t bytes;
 	uint64_t errors;
+	uint64_t too_many_descs;
 };
 
diff --git a/drivers/net/gve/gve_tx_dqo.c b/drivers/net/gve/gve_tx_dqo.c
index 7e03e75b20..27f98cdeb3 100644
--- a/drivers/net/gve/gve_tx_dqo.c
+++ b/drivers/net/gve/gve_tx_dqo.c
@@ -166,4 +166,10 @@ gve_tx_burst_dqo(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 		}
 
+		/* Drop packet if it doesn't adhere to hardware limits. */
+		if (!tso && nb_descs > GVE_TX_MAX_DATA_DESCS) {
+			txq->stats.too_many_descs++;
+			break;
+		}
+
 		if (tso) {
 			txd = &txr[tx_id];
-- 
2.51.0

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2025-10-31 13:53:52.686450388 +0000
+++ 0013-net-gve-add-DQO-Tx-descriptor-limit.patch	2025-10-31 13:53:52.019523315 +0000
@@ -1 +1 @@
-From f4a70b449bfac5343bf498f4132d5b8da4b0a885 Mon Sep 17 00:00:00 2001
+From 952398a7b241ed5a32b604a67f6972a33eb3589b Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit f4a70b449bfac5343bf498f4132d5b8da4b0a885 ]
+
@@ -11 +12,0 @@
-Cc: stable at dpdk.org
@@ -22 +23 @@
-index bdb7f1d075..81325ba98c 100644
+index e471a34e61..5be4f64fde 100644