octeontx2-pf: cn10k: Config DWRR weight based on MTU

Program SQ, MDQ, TL4 to TL2 transmit scheduler queues' DWRR
weight based on DWRR MTU programmed at NIX_AF_DWRR_RPM_MTU.
The DWRR MTU from admin function is retrieved via mbox.

On OcteaonTx2 silicon, admin function driver responds with DWRR
MTU as '1'. This helps to avoid silicon specific transmit
scheduler DWRR quantum/weight configuration logic.

Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 6 deletions

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
index 70fcc1fd962f..ce799b7a8449 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
@@ -596,6 +596,9 @@ int otx2_txschq_config(struct otx2_nic *pfvf, int lvl)
 	struct otx2_hw *hw = &pfvf->hw;
 	struct nix_txschq_config *req;
 	u64 schq, parent;
+	u64 dwrr_val;
+
+	dwrr_val = mtu_to_dwrr_weight(pfvf, pfvf->max_frs);
 
 	req = otx2_mbox_alloc_msg_nix_txschq_cfg(&pfvf->mbox);
 	if (!req)
@@ -621,21 +624,21 @@ int otx2_txschq_config(struct otx2_nic *pfvf, int lvl)
 		req->num_regs++;
 		/* Set DWRR quantum */
 		req->reg[2] = NIX_AF_MDQX_SCHEDULE(schq);
-		req->regval[2] =  DFLT_RR_QTM;
+		req->regval[2] =  dwrr_val;
 	} else if (lvl == NIX_TXSCH_LVL_TL4) {
 		parent =  hw->txschq_list[NIX_TXSCH_LVL_TL3][0];
 		req->reg[0] = NIX_AF_TL4X_PARENT(schq);
 		req->regval[0] = parent << 16;
 		req->num_regs++;
 		req->reg[1] = NIX_AF_TL4X_SCHEDULE(schq);
-		req->regval[1] = DFLT_RR_QTM;
+		req->regval[1] = dwrr_val;
 	} else if (lvl == NIX_TXSCH_LVL_TL3) {
 		parent = hw->txschq_list[NIX_TXSCH_LVL_TL2][0];
 		req->reg[0] = NIX_AF_TL3X_PARENT(schq);
 		req->regval[0] = parent << 16;
 		req->num_regs++;
 		req->reg[1] = NIX_AF_TL3X_SCHEDULE(schq);
-		req->regval[1] = DFLT_RR_QTM;
+		req->regval[1] = dwrr_val;
 	} else if (lvl == NIX_TXSCH_LVL_TL2) {
 		parent =  hw->txschq_list[NIX_TXSCH_LVL_TL1][0];
 		req->reg[0] = NIX_AF_TL2X_PARENT(schq);
@@ -643,7 +646,7 @@ int otx2_txschq_config(struct otx2_nic *pfvf, int lvl)
 
 		req->num_regs++;
 		req->reg[1] = NIX_AF_TL2X_SCHEDULE(schq);
-		req->regval[1] = TXSCH_TL1_DFLT_RR_PRIO << 24 | DFLT_RR_QTM;
+		req->regval[1] = TXSCH_TL1_DFLT_RR_PRIO << 24 | dwrr_val;
 
 		req->num_regs++;
 		req->reg[2] = NIX_AF_TL3_TL2X_LINKX_CFG(schq,
@@ -656,7 +659,10 @@ int otx2_txschq_config(struct otx2_nic *pfvf, int lvl)
 		 * For VF this is always ignored.
 		 */
 
-		/* Set DWRR quantum */
+		/* On CN10K, if RR_WEIGHT is greater than 16384, HW will
+		 * clip it to 16384, so configuring a 24bit max value
+		 * will work on both OTx2 and CN10K.
+		 */
 		req->reg[0] = NIX_AF_TL1X_SCHEDULE(schq);
 		req->regval[0] = TXSCH_TL1_DFLT_RR_QTM;
 
@@ -803,7 +809,7 @@ int otx2_sq_aq_init(void *dev, u16 qidx, u16 sqb_aura)
 	aq->sq.ena = 1;
 	/* Only one SMQ is allocated, map all SQ's to that SMQ  */
 	aq->sq.smq = pfvf->hw.txschq_list[NIX_TXSCH_LVL_SMQ][0];
-	aq->sq.smq_rr_quantum = DFLT_RR_QTM;
+	aq->sq.smq_rr_quantum = mtu_to_dwrr_weight(pfvf, pfvf->max_frs);
 	aq->sq.default_chan = pfvf->hw.tx_chan_base;
 	aq->sq.sqe_stype = NIX_STYPE_STF; /* Cache SQB */
 	aq->sq.sqb_aura = sqb_aura;
@@ -1668,6 +1674,11 @@ u16 otx2_get_max_mtu(struct otx2_nic *pfvf)
 		 * SMQ errors
 		 */
 		max_mtu = rsp->max_mtu - 8 - OTX2_ETH_HLEN;
+
+		/* Also save DWRR MTU, needed for DWRR weight calculation */
+		pfvf->hw.dwrr_mtu = rsp->rpm_dwrr_mtu;
+		if (!pfvf->hw.dwrr_mtu)
+			pfvf->hw.dwrr_mtu = 1;
 	}
 
 out: