[dpdk-dev] [PATCH 05/14] net/enic: report ring limits and preferred default values

[John Daley <johndale@cisco.com>]

From: Hyong Youb Kim <hyonkim@cisco.com>

Report min/max ring sizes, alignments, and so on, and rely on the
common checks implemented in the rte_ethdev layer.

Signed-off-by: Hyong Youb Kim <hyonkim@cisco.com>
Reviewed-by: John Daley <johndale@cisco.com>
---
 drivers/net/enic/enic_ethdev.c | 24 ++++++++++++++++++++++++
 drivers/net/enic/enic_main.c   | 24 ++++++++----------------
 drivers/net/enic/enic_res.h    | 12 ++++++++++++
 3 files changed, 44 insertions(+), 16 deletions(-)

diff --git a/drivers/net/enic/enic_ethdev.c b/drivers/net/enic/enic_ethdev.c
index 6ebad8d96..697dd6508 100644
--- a/drivers/net/enic/enic_ethdev.c
+++ b/drivers/net/enic/enic_ethdev.c
@@ -482,6 +482,30 @@ static void enicpmd_dev_info_get(struct rte_eth_dev *eth_dev,
 	device_info->reta_size = enic->reta_size;
 	device_info->hash_key_size = enic->hash_key_size;
 	device_info->flow_type_rss_offloads = enic->flow_type_rss_offloads;
+	device_info->rx_desc_lim = (struct rte_eth_desc_lim) {
+		.nb_max = enic->config.rq_desc_count,
+		.nb_min = ENIC_MIN_RQ_DESCS,
+		.nb_align = ENIC_ALIGN_DESCS,
+	};
+	device_info->tx_desc_lim = (struct rte_eth_desc_lim) {
+		.nb_max = enic->config.wq_desc_count,
+		.nb_min = ENIC_MIN_WQ_DESCS,
+		.nb_align = ENIC_ALIGN_DESCS,
+		.nb_seg_max = ENIC_TX_XMIT_MAX,
+		.nb_mtu_seg_max = ENIC_NON_TSO_MAX_DESC,
+	};
+	device_info->default_rxportconf = (struct rte_eth_dev_portconf) {
+		.burst_size = ENIC_DEFAULT_RX_BURST,
+		.ring_size = RTE_MIN(device_info->rx_desc_lim.nb_max,
+			ENIC_DEFAULT_RX_RING_SIZE),
+		.nb_queues = ENIC_DEFAULT_RX_RINGS,
+	};
+	device_info->default_txportconf = (struct rte_eth_dev_portconf) {
+		.burst_size = ENIC_DEFAULT_TX_BURST,
+		.ring_size = RTE_MIN(device_info->tx_desc_lim.nb_max,
+			ENIC_DEFAULT_TX_RING_SIZE),
+		.nb_queues = ENIC_DEFAULT_TX_RINGS,
+	};
 }
 
 static const uint32_t *enicpmd_dev_supported_ptypes_get(struct rte_eth_dev *dev)
diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index 863d2463c..2cd85168d 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -743,8 +743,8 @@ int enic_alloc_rq(struct enic *enic, uint16_t queue_idx,
 	}
 
 	/* number of descriptors have to be a multiple of 32 */
-	nb_sop_desc = (nb_desc / mbufs_per_pkt) & ~0x1F;
-	nb_data_desc = (nb_desc - nb_sop_desc) & ~0x1F;
+	nb_sop_desc = (nb_desc / mbufs_per_pkt) & ENIC_ALIGN_DESCS_MASK;
+	nb_data_desc = (nb_desc - nb_sop_desc) & ENIC_ALIGN_DESCS_MASK;
 
 	rq_sop->max_mbufs_per_pkt = mbufs_per_pkt;
 	rq_data->max_mbufs_per_pkt = mbufs_per_pkt;
@@ -752,7 +752,7 @@ int enic_alloc_rq(struct enic *enic, uint16_t queue_idx,
 	if (mbufs_per_pkt > 1) {
 		min_sop = 64;
 		max_sop = ((enic->config.rq_desc_count /
-			    (mbufs_per_pkt - 1)) & ~0x1F);
+			    (mbufs_per_pkt - 1)) & ENIC_ALIGN_DESCS_MASK);
 		min_data = min_sop * (mbufs_per_pkt - 1);
 		max_data = enic->config.rq_desc_count;
 	} else {
@@ -870,19 +870,11 @@ int enic_alloc_wq(struct enic *enic, uint16_t queue_idx,
 	static int instance;
 
 	wq->socket_id = socket_id;
-	if (nb_desc > enic->config.wq_desc_count) {
-		dev_warning(enic,
-			    "WQ %d - number of tx desc in cmd line (%d) "
-			    "is greater than that in the UCSM/CIMC adapter "
-			    "policy.  Applying the value in the adapter "
-			    "policy (%d)\n",
-			    queue_idx, nb_desc, enic->config.wq_desc_count);
-		nb_desc = enic->config.wq_desc_count;
-	} else if (nb_desc != enic->config.wq_desc_count) {
-		dev_info(enic,
-			 "TX Queues - effective number of descs:%d\n",
-			 nb_desc);
-	}
+	/*
+	 * rte_eth_tx_queue_setup() checks min, max, and alignment. So just
+	 * print an info message for diagnostics.
+	 */
+	dev_info(enic, "TX Queues - effective number of descs:%d\n", nb_desc);
 
 	/* Allocate queue resources */
 	err = vnic_wq_alloc(enic->vdev, &enic->wq[queue_idx], queue_idx,
diff --git a/drivers/net/enic/enic_res.h b/drivers/net/enic/enic_res.h
index e68f1307b..6a3a0c5cc 100644
--- a/drivers/net/enic/enic_res.h
+++ b/drivers/net/enic/enic_res.h
@@ -16,6 +16,10 @@
 #define ENIC_MIN_RQ_DESCS		64
 #define ENIC_MAX_RQ_DESCS		4096
 
+/* A descriptor ring has a multiple of 32 descriptors */
+#define ENIC_ALIGN_DESCS		32
+#define ENIC_ALIGN_DESCS_MASK		~(ENIC_ALIGN_DESCS - 1)
+
 #define ENIC_MIN_MTU			68
 
 /* Does not include (possible) inserted VLAN tag and FCS */
@@ -31,6 +35,14 @@
 #define ENIC_DEFAULT_RX_FREE_THRESH	32
 #define ENIC_TX_XMIT_MAX		64
 
+/* Defaults for dev_info.default_{rx,tx}portconf */
+#define ENIC_DEFAULT_RX_BURST		32
+#define ENIC_DEFAULT_RX_RINGS		1
+#define ENIC_DEFAULT_RX_RING_SIZE	512
+#define ENIC_DEFAULT_TX_BURST		32
+#define ENIC_DEFAULT_TX_RINGS		1
+#define ENIC_DEFAULT_TX_RING_SIZE	512
+
 #define ENIC_RSS_DEFAULT_CPU    0
 #define ENIC_RSS_BASE_CPU       0
 #define ENIC_RSS_HASH_BITS      7
-- 
2.16.2