[PATCH v2 2/2] net/null: revise info_get

[Stephen Hemminger <stephen@networkplumber.org>]

The dev_info_get callback does not need to check for invalid arguments
since that is already done at ethdev layer.

Make the min/max MTU values reflect the most an Ethernet type
PMD would allow.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 app/test/test_pmd_null.c        | 13 +++++++++++--
 drivers/net/null/rte_eth_null.c | 11 ++++-------
 2 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/app/test/test_pmd_null.c b/app/test/test_pmd_null.c
index c6a8bba701..ee62d7ecb5 100644
--- a/app/test/test_pmd_null.c
+++ b/app/test/test_pmd_null.c
@@ -430,6 +430,10 @@ static int
 test_null_dev_info(void)
 {
 	struct rte_eth_dev_info dev_info;
+	const uint16_t jumbo_mtu = RTE_ETHER_MAX_JUMBO_FRAME_LEN
+		- RTE_ETHER_HDR_LEN - RTE_ETHER_CRC_LEN;
+	const uint16_t min_mtu = RTE_ETHER_MIN_LEN - RTE_ETHER_HDR_LEN -
+		RTE_ETHER_CRC_LEN;
 	int ret;
 
 	ret = rte_eth_dev_info_get(port_id, &dev_info);
@@ -438,8 +442,13 @@ test_null_dev_info(void)
 	/* Verify expected device info values */
 	TEST_ASSERT(dev_info.max_mac_addrs == 1,
 		    "Expected max_mac_addrs=1, got %u", dev_info.max_mac_addrs);
-	TEST_ASSERT(dev_info.max_rx_pktlen == UINT32_MAX,
-		    "Unexpected max_rx_pktlen");
+
+	TEST_ASSERT(dev_info.max_mtu == jumbo_mtu,
+		    "Unexpected max_mtu: %u", dev_info.max_mtu);
+	TEST_ASSERT(dev_info.min_mtu == min_mtu,
+		    "Unexpected min_mtu: %u", dev_info.max_mtu);
+	TEST_ASSERT(dev_info.max_rx_pktlen == RTE_ETHER_MAX_JUMBO_FRAME_LEN,
+		    "Unexpected max_rx_pktlen: %u", dev_info.max_rx_pktlen);
 	TEST_ASSERT(dev_info.min_rx_bufsize == 0,
 		    "Expected min_rx_bufsize=0, got %u", dev_info.min_rx_bufsize);
 
diff --git a/drivers/net/null/rte_eth_null.c b/drivers/net/null/rte_eth_null.c
index 46e7e7bd8c..2928f0d2d5 100644
--- a/drivers/net/null/rte_eth_null.c
+++ b/drivers/net/null/rte_eth_null.c
@@ -298,19 +298,16 @@ static int
 eth_dev_info(struct rte_eth_dev *dev,
 		struct rte_eth_dev_info *dev_info)
 {
-	struct pmd_internals *internals;
-
-	if ((dev == NULL) || (dev_info == NULL))
-		return -EINVAL;
+	struct pmd_internals *internals = dev->data->dev_private;
 
-	internals = dev->data->dev_private;
 	dev_info->max_mac_addrs = 1;
-	dev_info->max_rx_pktlen = (uint32_t)-1;
 	dev_info->max_rx_queues = RTE_DIM(internals->rx_null_queues);
 	dev_info->max_tx_queues = RTE_DIM(internals->tx_null_queues);
-	dev_info->min_rx_bufsize = 0;
 	dev_info->tx_offload_capa = RTE_ETH_TX_OFFLOAD_MULTI_SEGS | RTE_ETH_TX_OFFLOAD_MT_LOCKFREE;
 
+	dev_info->max_rx_pktlen = RTE_ETHER_MAX_JUMBO_FRAME_LEN;
+	dev_info->max_mtu = RTE_ETHER_MAX_JUMBO_FRAME_LEN
+		- RTE_ETHER_HDR_LEN - RTE_ETHER_CRC_LEN;
 	dev_info->reta_size = internals->reta_size;
 	dev_info->flow_type_rss_offloads = internals->flow_type_rss_offloads;
 	dev_info->hash_key_size = sizeof(internals->rss_key);
-- 
2.51.0