enic: get max rq & wq entries supported by hw, 16K queues

JIRA: https://issues.redhat.com/browse/RHEL-84863

commit df9fd2a
Author: Satish Kharat <satishkh@cisco.com>
Date:   Tue Mar 4 19:56:44 2025 -0500

    enic: get max rq & wq entries supported by hw, 16K queues

    Enables reading the max rq and wq entries supported from the hw.
    Enables 16k rq and wq entries on hw that supports.

    Co-developed-by: Nelson Escobar <neescoba@cisco.com>
    Signed-off-by: Nelson Escobar <neescoba@cisco.com>
    Co-developed-by: John Daley <johndale@cisco.com>
    Signed-off-by: John Daley <johndale@cisco.com>
    Signed-off-by: Satish Kharat <satishkh@cisco.com>
    Link: https://patch.msgid.link/20250304-enic_cleanup_and_ext_cq-v2-8-85804263dad8@cisco.com
    Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Signed-off-by: Nelson Escobar <nescobar@redhat.com>

Author: Nelson Escobar

drivers/net/ethernet/cisco/enic/enic_ethtool.c

@@ -222,9 +222,9 @@ static void enic_get_ringparam(struct net_device *netdev,
 	struct enic *enic = netdev_priv(netdev);
 	struct vnic_enet_config *c = &enic->config;
 
-	ring->rx_max_pending = ENIC_MAX_RQ_DESCS;
+	ring->rx_max_pending = c->max_rq_ring;
 	ring->rx_pending = c->rq_desc_count;
-	ring->tx_max_pending = ENIC_MAX_WQ_DESCS;
+	ring->tx_max_pending = c->max_wq_ring;
 	ring->tx_pending = c->wq_desc_count;
 }
 
@@ -252,18 +252,18 @@ static int enic_set_ringparam(struct net_device *netdev,
 	}
 	rx_pending = c->rq_desc_count;
 	tx_pending = c->wq_desc_count;
-	if (ring->rx_pending > ENIC_MAX_RQ_DESCS ||
+	if (ring->rx_pending > c->max_rq_ring ||
 	    ring->rx_pending < ENIC_MIN_RQ_DESCS) {
 		netdev_info(netdev, "rx pending (%u) not in range [%u,%u]",
 			    ring->rx_pending, ENIC_MIN_RQ_DESCS,
-			    ENIC_MAX_RQ_DESCS);
+	      c->max_rq_ring);
 		return -EINVAL;
 	}
-	if (ring->tx_pending > ENIC_MAX_WQ_DESCS ||
+	if (ring->tx_pending > c->max_wq_ring ||
 	    ring->tx_pending < ENIC_MIN_WQ_DESCS) {
 		netdev_info(netdev, "tx pending (%u) not in range [%u,%u]",
 			    ring->tx_pending, ENIC_MIN_WQ_DESCS,
-			    ENIC_MAX_WQ_DESCS);
+			c->max_wq_ring);
 		return -EINVAL;
 	}
 	if (running)

drivers/net/ethernet/cisco/enic/enic_res.c

@@ -59,31 +59,38 @@ int enic_get_vnic_config(struct enic *enic)
 	GET_CONFIG(intr_timer_usec);
 	GET_CONFIG(loop_tag);
 	GET_CONFIG(num_arfs);
+	GET_CONFIG(max_rq_ring);
+	GET_CONFIG(max_wq_ring);
+	GET_CONFIG(max_cq_ring);
+
+	if (!c->max_wq_ring)
+		c->max_wq_ring = ENIC_MAX_WQ_DESCS_DEFAULT;
+	if (!c->max_rq_ring)
+		c->max_rq_ring = ENIC_MAX_RQ_DESCS_DEFAULT;
+	if (!c->max_cq_ring)
+		c->max_cq_ring = ENIC_MAX_CQ_DESCS_DEFAULT;
 
 	c->wq_desc_count =
-		min_t(u32, ENIC_MAX_WQ_DESCS,
-		max_t(u32, ENIC_MIN_WQ_DESCS,
-		c->wq_desc_count));
+		min_t(u32, c->max_wq_ring,
+		      max_t(u32, ENIC_MIN_WQ_DESCS, c->wq_desc_count));
 	c->wq_desc_count &= 0xffffffe0; /* must be aligned to groups of 32 */
 
 	c->rq_desc_count =
-		min_t(u32, ENIC_MAX_RQ_DESCS,
-		max_t(u32, ENIC_MIN_RQ_DESCS,
-		c->rq_desc_count));
+		min_t(u32, c->max_rq_ring,
+		      max_t(u32, ENIC_MIN_RQ_DESCS, c->rq_desc_count));
 	c->rq_desc_count &= 0xffffffe0; /* must be aligned to groups of 32 */
 
 	if (c->mtu == 0)
 		c->mtu = 1500;
-	c->mtu = min_t(u16, ENIC_MAX_MTU,
-		max_t(u16, ENIC_MIN_MTU,
-		c->mtu));
+	c->mtu = min_t(u16, ENIC_MAX_MTU, max_t(u16, ENIC_MIN_MTU, c->mtu));
 
 	c->intr_timer_usec = min_t(u32, c->intr_timer_usec,
 		vnic_dev_get_intr_coal_timer_max(enic->vdev));
 
 	dev_info(enic_get_dev(enic),
-		"vNIC MAC addr %pM wq/rq %d/%d mtu %d\n",
-		enic->mac_addr, c->wq_desc_count, c->rq_desc_count, c->mtu);
+		 "vNIC MAC addr %pM wq/rq %d/%d max wq/rq/cq %d/%d/%d mtu %d\n",
+		 enic->mac_addr, c->wq_desc_count, c->rq_desc_count,
+		 c->max_wq_ring, c->max_rq_ring, c->max_cq_ring, c->mtu);
 
 	dev_info(enic_get_dev(enic), "vNIC csum tx/rx %s/%s "
 		"tso/lro %s/%s rss %s intr mode %s type %s timer %d usec "

drivers/net/ethernet/cisco/enic/enic_res.h

@@ -12,10 +12,13 @@
 #include "vnic_wq.h"
 #include "vnic_rq.h"
 
-#define ENIC_MIN_WQ_DESCS		64
-#define ENIC_MAX_WQ_DESCS		4096
-#define ENIC_MIN_RQ_DESCS		64
-#define ENIC_MAX_RQ_DESCS		4096
+#define ENIC_MIN_WQ_DESCS 64
+#define ENIC_MAX_WQ_DESCS_DEFAULT 4096
+#define ENIC_MAX_WQ_DESCS 16384
+#define ENIC_MIN_RQ_DESCS 64
+#define ENIC_MAX_RQ_DESCS 16384
+#define ENIC_MAX_RQ_DESCS_DEFAULT 4096
+#define ENIC_MAX_CQ_DESCS_DEFAULT (64 * 1024)
 
 #define ENIC_MIN_MTU			ETH_MIN_MTU
 #define ENIC_MAX_MTU			9000

drivers/net/ethernet/cisco/enic/enic_wq.c

@@ -93,7 +93,7 @@ unsigned int enic_wq_cq_service(struct enic *enic, unsigned int cq_index,
 	u8 type, color;
 	bool ext_wq;
 
-	ext_wq = cq->ring.size > ENIC_MAX_WQ_DESCS;
+	ext_wq = cq->ring.size > ENIC_MAX_WQ_DESCS_DEFAULT;
 
 	cq_desc = (struct cq_desc *)vnic_cq_to_clean(cq);
 	enic_wq_cq_desc_dec(cq_desc, ext_wq, &type, &color,

drivers/net/ethernet/cisco/enic/vnic_enet.h

@@ -21,6 +21,11 @@ struct vnic_enet_config {
 	u16 loop_tag;
 	u16 vf_rq_count;
 	u16 num_arfs;
+	u8 reserved[66];
+	u32 max_rq_ring;	// MAX RQ ring size
+	u32 max_wq_ring;	// MAX WQ ring size
+	u32 max_cq_ring;	// MAX CQ ring size
+	u32 rdma_rsvd_lkey;	// Reserved (privileged) LKey
 };
 
 #define VENETF_TSO		0x1	/* TSO enabled */

drivers/net/ethernet/cisco/enic/vnic_rq.h

@@ -50,7 +50,7 @@ struct vnic_rq_ctrl {
 	(VNIC_RQ_BUF_BLK_ENTRIES(entries) * sizeof(struct vnic_rq_buf))
 #define VNIC_RQ_BUF_BLKS_NEEDED(entries) \
 	DIV_ROUND_UP(entries, VNIC_RQ_BUF_BLK_ENTRIES(entries))
-#define VNIC_RQ_BUF_BLKS_MAX VNIC_RQ_BUF_BLKS_NEEDED(4096)
+#define VNIC_RQ_BUF_BLKS_MAX VNIC_RQ_BUF_BLKS_NEEDED(16384)
 
 struct vnic_rq_buf {
 	struct vnic_rq_buf *next;

drivers/net/ethernet/cisco/enic/vnic_wq.h

@@ -62,7 +62,7 @@ struct vnic_wq_buf {
 	(VNIC_WQ_BUF_BLK_ENTRIES(entries) * sizeof(struct vnic_wq_buf))
 #define VNIC_WQ_BUF_BLKS_NEEDED(entries) \
 	DIV_ROUND_UP(entries, VNIC_WQ_BUF_BLK_ENTRIES(entries))
-#define VNIC_WQ_BUF_BLKS_MAX VNIC_WQ_BUF_BLKS_NEEDED(4096)
+#define VNIC_WQ_BUF_BLKS_MAX VNIC_WQ_BUF_BLKS_NEEDED(16384)
 
 struct vnic_wq {
 	unsigned int index;