[PATCH 5/8] ethdev: check DCB availability

[David Marchand <david.marchand@redhat.com>]

Add DCB capability check in rte_eth_dev_configure() using
dev->dev_ops->get_dcb_info.

When NULL, reject Rx modes with RTE_ETH_MQ_RX_DCB_FLAG and
Tx modes RTE_ETH_MQ_TX_DCB and RTE_ETH_MQ_TX_VMDQ_DCB.
Remove redundant DCB checks from drivers.

Check that documentation is aligned with driver code.

Signed-off-by: David Marchand <david.marchand@redhat.com>
---
 devtools/check-doc-vs-code.sh          | 14 +++++++++++++-
 doc/guides/rel_notes/release_26_11.rst | 11 ++++++++---
 drivers/net/intel/e1000/igb_ethdev.c   |  6 ------
 drivers/net/intel/fm10k/fm10k_ethdev.c |  5 -----
 lib/ethdev/rte_ethdev.c                | 16 ++++++++++++++++
 5 files changed, 37 insertions(+), 15 deletions(-)

diff --git a/devtools/check-doc-vs-code.sh b/devtools/check-doc-vs-code.sh
index 7936f8b69f..81c9713f5a 100755
--- a/devtools/check-doc-vs-code.sh
+++ b/devtools/check-doc-vs-code.sh
@@ -77,6 +77,18 @@ check_mq_caps() # <driver>
 	[ -d $code ] || return 0
 	[ -f $doc ] || return 0
 
+	if all_docs_agree $1 "DCB"; then
+		if has_doc_feature "$doc" "DCB"; then
+			git grep -q '\.get_dcb_info[[:space:]]*=' -- "$code" ||
+				error "DCB documented but no get_dcb_info callback for $1"
+		else
+			! git grep -q '\.get_dcb_info[[:space:]]*=' -- "$code" ||
+				error "get_dcb_info callback but DCB not documented for $1"
+			! git grep -qE 'RTE_ETH_MQ_(RX|TX).*DCB' -- "$code" ||
+				error "DCB mq_mode referenced but DCB not documented for $1"
+		fi
+	fi
+
 	if all_docs_agree $1 "VMDq"; then
 		if has_doc_feature "$doc" "VMDq"; then
 			git grep -qE 'max_vmdq_pools[[:space:]]*=' -- "$code" ||
@@ -119,7 +131,7 @@ if has_code_change 'RTE_FLOW_.*_TYPE_' ||
 		check_rte_flow $driver
 	done
 fi
-if has_code_change 'max_vmdq_pools\|RTE_ETH_MQ_.*VMDQ' ||
+if has_code_change 'get_dcb_info\|max_vmdq_pools\|RTE_ETH_MQ_.*DCB\|RTE_ETH_MQ_.*VMDQ' ||
 		has_file_change 'doc/guides/nics/features'; then
 	for driver in $(changed_net_drivers); do
 		check_mq_caps $driver
diff --git a/doc/guides/rel_notes/release_26_11.rst b/doc/guides/rel_notes/release_26_11.rst
index be758a0c02..9341769c32 100644
--- a/doc/guides/rel_notes/release_26_11.rst
+++ b/doc/guides/rel_notes/release_26_11.rst
@@ -424,11 +424,16 @@ API Changes
   * Removed the ``unused`` field.
   * Changed the ``objs`` array from fixed size to variable size.
 
+* ethdev: Updated multi-queue mode validation at port configuration time:
+
+  * DCB modes (Rx ``RTE_ETH_MQ_RX_DCB_FLAG``, Tx ``RTE_ETH_MQ_TX_DCB``/``RTE_ETH_MQ_TX_VMDQ_DCB``)
+    are rejected if the driver has no ``get_dcb_info`` callback.
+  * VMDq modes (Rx ``RTE_ETH_MQ_RX_VMDQ_FLAG``,
+    Tx ``RTE_ETH_MQ_TX_VMDQ_DCB``/``RTE_ETH_MQ_TX_VMDQ_ONLY``) are rejected
+    if the driver reports no VMDq pool.
+
 * ethdev: Updated VMDq related API.
 
-  * At port configuration time, the number of VMDq pools advertised by a driver
-    is now used to validate VMDq related Rx and Tx modes
-    (``RTE_ETH_MQ_RX_VMDQ_FLAG``, ``RTE_ETH_MQ_TX_VMDQ_DCB``, ``RTE_ETH_MQ_TX_VMDQ_ONLY``).
   * A check was added in ``rte_eth_dev_mac_addr_add`` to validate that
     the ``pool`` parameter is 0 when VMDq is not configured.
   * The ``RTE_ETH_NUM_RECEIVE_MAC_ADDR`` and ``RTE_ETH_VMDQ_NUM_UC_HASH_ARRAY`` macros
diff --git a/drivers/net/intel/e1000/igb_ethdev.c b/drivers/net/intel/e1000/igb_ethdev.c
index 524c030be6..181af58169 100644
--- a/drivers/net/intel/e1000/igb_ethdev.c
+++ b/drivers/net/intel/e1000/igb_ethdev.c
@@ -1144,12 +1144,6 @@ igb_check_mq_mode(struct rte_eth_dev *dev)
 	uint16_t nb_rx_q = dev->data->nb_rx_queues;
 	uint16_t nb_tx_q = dev->data->nb_tx_queues;
 
-	if ((rx_mq_mode & RTE_ETH_MQ_RX_DCB_FLAG) ||
-	    tx_mq_mode == RTE_ETH_MQ_TX_DCB ||
-	    tx_mq_mode == RTE_ETH_MQ_TX_VMDQ_DCB) {
-		PMD_INIT_LOG(ERR, "DCB mode is not supported.");
-		return -EINVAL;
-	}
 	if (RTE_ETH_DEV_SRIOV(dev).active != 0) {
 		/* Check multi-queue mode.
 		 * To no break software we accept RTE_ETH_MQ_RX_NONE as this might
diff --git a/drivers/net/intel/fm10k/fm10k_ethdev.c b/drivers/net/intel/fm10k/fm10k_ethdev.c
index 9b123c0b2c..5aa15a8dba 100644
--- a/drivers/net/intel/fm10k/fm10k_ethdev.c
+++ b/drivers/net/intel/fm10k/fm10k_ethdev.c
@@ -416,11 +416,6 @@ fm10k_check_mq_mode(struct rte_eth_dev *dev)
 
 	vmdq_conf = &dev->data->dev_conf.rx_adv_conf.vmdq_rx_conf;
 
-	if (rx_mq_mode & RTE_ETH_MQ_RX_DCB_FLAG) {
-		PMD_INIT_LOG(ERR, "DCB mode is not supported.");
-		return -EINVAL;
-	}
-
 	if (!(rx_mq_mode & RTE_ETH_MQ_RX_VMDQ_FLAG))
 		return 0;
 
diff --git a/lib/ethdev/rte_ethdev.c b/lib/ethdev/rte_ethdev.c
index f843e8808a..39a895c9e4 100644
--- a/lib/ethdev/rte_ethdev.c
+++ b/lib/ethdev/rte_ethdev.c
@@ -1573,6 +1573,22 @@ rte_eth_dev_configure(uint16_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,
 		goto rollback;
 	}
 
+	if (dev->dev_ops->get_dcb_info == NULL) {
+		if ((dev_conf->rxmode.mq_mode & RTE_ETH_MQ_RX_DCB_FLAG) != 0) {
+			RTE_ETHDEV_LOG_LINE(ERR, "Ethdev port_id=%u does not support DCB rx mode",
+				port_id);
+			ret = -EINVAL;
+			goto rollback;
+		}
+		if (dev_conf->txmode.mq_mode == RTE_ETH_MQ_TX_DCB ||
+				dev_conf->txmode.mq_mode == RTE_ETH_MQ_TX_VMDQ_DCB) {
+			RTE_ETHDEV_LOG_LINE(ERR, "Ethdev port_id=%u does not support DCB tx mode",
+				port_id);
+			ret = -EINVAL;
+			goto rollback;
+		}
+	}
+
 	if (dev_info.max_vmdq_pools == 0) {
 		if ((dev_conf->rxmode.mq_mode & RTE_ETH_MQ_RX_VMDQ_FLAG) != 0) {
 			RTE_ETHDEV_LOG_LINE(ERR, "Ethdev port_id=%u does not support VMDq rx mode",
-- 
2.54.0