bnxt_en: Reserve RDMA resources by default.

If the device supports RDMA, we'll setup network default rings so that
there are enough minimum resources for RDMA, if possible.  However, the
user can still increase network rings to the max if he wants.  The actual
RDMA resources won't be reserved until the RDMA driver registers.

v2: Fix compile warning when BNXT_CONFIG_SRIOV is not set.

Signed-off-by: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 57 insertions, 1 deletions

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 52b8ad4973e3..57285bd76944 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -4166,6 +4166,11 @@ static int bnxt_hwrm_func_qcaps(struct bnxt *bp)
 	if (rc)
 		goto hwrm_func_qcaps_exit;
 
+	if (resp->flags & cpu_to_le32(FUNC_QCAPS_RESP_FLAGS_ROCE_V1_SUPPORTED))
+		bp->flags |= BNXT_FLAG_ROCEV1_CAP;
+	if (resp->flags & cpu_to_le32(FUNC_QCAPS_RESP_FLAGS_ROCE_V2_SUPPORTED))
+		bp->flags |= BNXT_FLAG_ROCEV2_CAP;
+
 	bp->tx_push_thresh = 0;
 	if (resp->flags &
 	    cpu_to_le32(FUNC_QCAPS_RESP_FLAGS_PUSH_MODE_SUPPORTED))
@@ -4808,6 +4813,24 @@ static int bnxt_setup_int_mode(struct bnxt *bp)
 	return rc;
 }
 
+unsigned int bnxt_get_max_func_stat_ctxs(struct bnxt *bp)
+{
+#if defined(CONFIG_BNXT_SRIOV)
+	if (BNXT_VF(bp))
+		return bp->vf.max_stat_ctxs;
+#endif
+	return bp->pf.max_stat_ctxs;
+}
+
+unsigned int bnxt_get_max_func_cp_rings(struct bnxt *bp)
+{
+#if defined(CONFIG_BNXT_SRIOV)
+	if (BNXT_VF(bp))
+		return bp->vf.max_cp_rings;
+#endif
+	return bp->pf.max_cp_rings;
+}
+
 static unsigned int bnxt_get_max_func_irqs(struct bnxt *bp)
 {
 #if defined(CONFIG_BNXT_SRIOV)
@@ -6832,6 +6855,39 @@ int bnxt_get_max_rings(struct bnxt *bp, int *max_rx, int *max_tx, bool shared)
 	return bnxt_trim_rings(bp, max_rx, max_tx, cp, shared);
 }
 
+static int bnxt_get_dflt_rings(struct bnxt *bp, int *max_rx, int *max_tx,
+			       bool shared)
+{
+	int rc;
+
+	rc = bnxt_get_max_rings(bp, max_rx, max_tx, shared);
+	if (rc)
+		return rc;
+
+	if (bp->flags & BNXT_FLAG_ROCE_CAP) {
+		int max_cp, max_stat, max_irq;
+
+		/* Reserve minimum resources for RoCE */
+		max_cp = bnxt_get_max_func_cp_rings(bp);
+		max_stat = bnxt_get_max_func_stat_ctxs(bp);
+		max_irq = bnxt_get_max_func_irqs(bp);
+		if (max_cp <= BNXT_MIN_ROCE_CP_RINGS ||
+		    max_irq <= BNXT_MIN_ROCE_CP_RINGS ||
+		    max_stat <= BNXT_MIN_ROCE_STAT_CTXS)
+			return 0;
+
+		max_cp -= BNXT_MIN_ROCE_CP_RINGS;
+		max_irq -= BNXT_MIN_ROCE_CP_RINGS;
+		max_stat -= BNXT_MIN_ROCE_STAT_CTXS;
+		max_cp = min_t(int, max_cp, max_irq);
+		max_cp = min_t(int, max_cp, max_stat);
+		rc = bnxt_trim_rings(bp, max_rx, max_tx, max_cp, shared);
+		if (rc)
+			rc = 0;
+	}
+	return rc;
+}
+
 static int bnxt_set_dflt_rings(struct bnxt *bp)
 {
 	int dflt_rings, max_rx_rings, max_tx_rings, rc;
@@ -6840,7 +6896,7 @@ static int bnxt_set_dflt_rings(struct bnxt *bp)
 	if (sh)
 		bp->flags |= BNXT_FLAG_SHARED_RINGS;
 	dflt_rings = netif_get_num_default_rss_queues();
-	rc = bnxt_get_max_rings(bp, &max_rx_rings, &max_tx_rings, sh);
+	rc = bnxt_get_dflt_rings(bp, &max_rx_rings, &max_tx_rings, sh);
 	if (rc)
 		return rc;
 	bp->rx_nr_rings = min_t(int, dflt_rings, max_rx_rings);