netdev - [net PATCH] octeontx2-pf: Dont enable backpressure on LBK links

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Date:   Sun, 25 Jul 2021 13:29:37 +0530
From:   Geetha sowjanya <gakula@...vell.com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <lcherian@...vell.com>, <tduszynski@...vell.com>,
        <kuba@...nel.org>, <davem@...emloft.net>, <hkelam@...vell.com>,
        <sbhatta@...vell.com>, <gakula@...vell.com>, <sgoutham@...vell.com>
Subject: [net PATCH] octeontx2-pf: Dont enable backpressure on LBK links

From: Hariprasad Kelam <hkelam@...vell.com>

Avoid configure backpressure for LBK links as they
don't support it and enable lmacs before configuration
pause frames.

Fixes: 75f36270990c ("octeontx2-pf: Support to enable/disable pause frames via ethtool")
Signed-off-by: Geetha sowjanya <gakula@...vell.com>
Signed-off-by: Hariprasad Kelam <hkelam@...vell.com>
---
 drivers/net/ethernet/marvell/octeontx2/af/cgx.c    |  2 +-
 .../ethernet/marvell/octeontx2/nic/otx2_common.c   | 14 ++++++++------
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/cgx.c b/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
index 9169849881bf..544c96c8fe1d 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
@@ -1504,8 +1504,8 @@ static int cgx_lmac_init(struct cgx *cgx)
 
 		/* Add reference */
 		cgx->lmac_idmap[lmac->lmac_id] = lmac;
-		cgx->mac_ops->mac_pause_frm_config(cgx, lmac->lmac_id, true);
 		set_bit(lmac->lmac_id, &cgx->lmac_bmap);
+		cgx->mac_ops->mac_pause_frm_config(cgx, lmac->lmac_id, true);
 	}
 
 	return cgx_lmac_verify_fwi_version(cgx);
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
index 7cccd802c4ed..70fcc1fd962f 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
@@ -924,12 +924,14 @@ static int otx2_cq_init(struct otx2_nic *pfvf, u16 qidx)
 		aq->cq.drop = RQ_DROP_LVL_CQ(pfvf->hw.rq_skid, cq->cqe_cnt);
 		aq->cq.drop_ena = 1;
 
-		/* Enable receive CQ backpressure */
-		aq->cq.bp_ena = 1;
-		aq->cq.bpid = pfvf->bpid[0];
+		if (!is_otx2_lbkvf(pfvf->pdev)) {
+			/* Enable receive CQ backpressure */
+			aq->cq.bp_ena = 1;
+			aq->cq.bpid = pfvf->bpid[0];
 
-		/* Set backpressure level is same as cq pass level */
-		aq->cq.bp = RQ_PASS_LVL_CQ(pfvf->hw.rq_skid, qset->rqe_cnt);
+			/* Set backpressure level is same as cq pass level */
+			aq->cq.bp = RQ_PASS_LVL_CQ(pfvf->hw.rq_skid, qset->rqe_cnt);
+		}
 	}
 
 	/* Fill AQ info */
@@ -1186,7 +1188,7 @@ static int otx2_aura_init(struct otx2_nic *pfvf, int aura_id,
 	aq->aura.fc_hyst_bits = 0; /* Store count on all updates */
 
 	/* Enable backpressure for RQ aura */
-	if (aura_id < pfvf->hw.rqpool_cnt) {
+	if (aura_id < pfvf->hw.rqpool_cnt && !is_otx2_lbkvf(pfvf->pdev)) {
 		aq->aura.bp_ena = 0;
 		aq->aura.nix0_bpid = pfvf->bpid[0];
 		/* Set backpressure level for RQ's Aura */
-- 
2.17.1