From:   Hariprasad Kelam <hkelam@marvell.com>
To:     <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>
CC:     <kuba@kernel.org>, <davem@davemloft.net>, <pabeni@redhat.com>,
        <edumazet@google.com>, <sgoutham@marvell.com>,
        <lcherian@marvell.com>, <gakula@marvell.com>, <jerinj@marvell.com>,
        <sbhatta@marvell.com>, <jhs@mojatatu.com>,
        <xiyou.wangcong@gmail.com>, <jiri@resnulli.us>,
        <saeedm@nvidia.com>, <richardcochran@gmail.com>,
        <tariqt@nvidia.com>, <linux-rdma@vger.kernel.org>,
        <maxtram95@gmail.com>, <naveenm@marvell.com>,
        <hariprasad.netdev@gmail.com>
Subject: [net-next PATCH V3 3/4] octeontx2-pf: Refactor schedular queue alloc/free calls
Date:   Mon, 6 Feb 2023 11:16:39 +0530
Message-ID: <20230206054640.5854-4-hkelam@marvell.com>
In-Reply-To: <20230206054640.5854-1-hkelam@marvell.com>
References: <20230206054640.5854-1-hkelam@marvell.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

Multiple transmit scheduler queues can be configured at different
levels to support traffic shaping and scheduling. But on txschq free
requests, the transmit schedular config in hardware is not getting
reset. This patch adds support to reset the stale config.

The txschq alloc response handler updates the default txschq
array which is used to configure the transmit packet path from
SMQ to TL2 levels. However, for new features such as QoS offload
that requires it's own txschq queues, this handler is still
invoked and results in undefined behavior. The code now handles
txschq response in the mbox caller function.

Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
Signed-off-by: Naveen Mamindlapalli <naveenm@marvell.com>
Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
---
 .../ethernet/marvell/octeontx2/af/rvu_nix.c   | 45 +++++++++++++++++++
 .../marvell/octeontx2/nic/otx2_common.c       | 36 ++++++++-------
 .../ethernet/marvell/octeontx2/nic/otx2_pf.c  |  4 --
 .../ethernet/marvell/octeontx2/nic/otx2_vf.c  |  4 --
 4 files changed, 64 insertions(+), 25 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
index 89e94569e74c..c11859999074 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
@@ -1677,6 +1677,42 @@ handle_txschq_shaper_update(struct rvu *rvu, int blkaddr, int nixlf,
 	return true;
 }
 
+static void nix_reset_tx_schedule(struct rvu *rvu, int blkaddr,
+				  int lvl, int schq)
+{
+	u64 tlx_parent = 0, tlx_schedule = 0;
+
+	switch (lvl) {
+	case NIX_TXSCH_LVL_TL2:
+		tlx_parent   = NIX_AF_TL2X_PARENT(schq);
+		tlx_schedule = NIX_AF_TL2X_SCHEDULE(schq);
+		break;
+	case NIX_TXSCH_LVL_TL3:
+		tlx_parent   = NIX_AF_TL3X_PARENT(schq);
+		tlx_schedule = NIX_AF_TL3X_SCHEDULE(schq);
+		break;
+	case NIX_TXSCH_LVL_TL4:
+		tlx_parent   = NIX_AF_TL4X_PARENT(schq);
+		tlx_schedule = NIX_AF_TL4X_SCHEDULE(schq);
+		break;
+	case NIX_TXSCH_LVL_MDQ:
+		/* no need to reset SMQ_CFG as HW clears this CSR
+		 * on SMQ flush
+		 */
+		tlx_parent   = NIX_AF_MDQX_PARENT(schq);
+		tlx_schedule = NIX_AF_MDQX_SCHEDULE(schq);
+		break;
+	default:
+		return;
+	}
+
+	if (tlx_parent)
+		rvu_write64(rvu, blkaddr, tlx_parent, 0x0);
+
+	if (tlx_schedule)
+		rvu_write64(rvu, blkaddr, tlx_schedule, 0x0);
+}
+
 /* Disable shaping of pkts by a scheduler queue
  * at a given scheduler level.
  */
@@ -2025,6 +2061,7 @@ int rvu_mbox_handler_nix_txsch_alloc(struct rvu *rvu,
 				pfvf_map[schq] = TXSCH_MAP(pcifunc, 0);
 			nix_reset_tx_linkcfg(rvu, blkaddr, lvl, schq);
 			nix_reset_tx_shaping(rvu, blkaddr, nixlf, lvl, schq);
+			nix_reset_tx_schedule(rvu, blkaddr, lvl, schq);
 		}
 
 		for (idx = 0; idx < req->schq[lvl]; idx++) {
@@ -2034,6 +2071,7 @@ int rvu_mbox_handler_nix_txsch_alloc(struct rvu *rvu,
 				pfvf_map[schq] = TXSCH_MAP(pcifunc, 0);
 			nix_reset_tx_linkcfg(rvu, blkaddr, lvl, schq);
 			nix_reset_tx_shaping(rvu, blkaddr, nixlf, lvl, schq);
+			nix_reset_tx_schedule(rvu, blkaddr, lvl, schq);
 		}
 	}
 
@@ -2122,6 +2160,7 @@ static int nix_txschq_free(struct rvu *rvu, u16 pcifunc)
 				continue;
 			nix_reset_tx_linkcfg(rvu, blkaddr, lvl, schq);
 			nix_clear_tx_xoff(rvu, blkaddr, lvl, schq);
+			nix_reset_tx_shaping(rvu, blkaddr, nixlf, lvl, schq);
 		}
 	}
 	nix_clear_tx_xoff(rvu, blkaddr, NIX_TXSCH_LVL_TL1,
@@ -2160,6 +2199,7 @@ static int nix_txschq_free(struct rvu *rvu, u16 pcifunc)
 		for (schq = 0; schq < txsch->schq.max; schq++) {
 			if (TXSCH_MAP_FUNC(txsch->pfvf_map[schq]) != pcifunc)
 				continue;
+			nix_reset_tx_schedule(rvu, blkaddr, lvl, schq);
 			rvu_free_rsrc(&txsch->schq, schq);
 			txsch->pfvf_map[schq] = TXSCH_MAP(0, NIX_TXSCHQ_FREE);
 		}
@@ -2219,6 +2259,9 @@ static int nix_txschq_free_one(struct rvu *rvu,
 	 */
 	nix_clear_tx_xoff(rvu, blkaddr, lvl, schq);
 
+	nix_reset_tx_linkcfg(rvu, blkaddr, lvl, schq);
+	nix_reset_tx_shaping(rvu, blkaddr, nixlf, lvl, schq);
+
 	/* Flush if it is a SMQ. Onus of disabling
 	 * TL2/3 queue links before SMQ flush is on user
 	 */
@@ -2228,6 +2271,8 @@ static int nix_txschq_free_one(struct rvu *rvu,
 		goto err;
 	}
 
+	nix_reset_tx_schedule(rvu, blkaddr, lvl, schq);
+
 	/* Free the resource */
 	rvu_free_rsrc(&txsch->schq, schq);
 	txsch->pfvf_map[schq] = TXSCH_MAP(0, NIX_TXSCHQ_FREE);
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
index f3ad4491ffb8..5d5bc62c0958 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
@@ -716,7 +716,8 @@ EXPORT_SYMBOL(otx2_smq_flush);
 int otx2_txsch_alloc(struct otx2_nic *pfvf)
 {
 	struct nix_txsch_alloc_req *req;
-	int lvl;
+	struct nix_txsch_alloc_rsp *rsp;
+	int lvl, schq, rc;
 
 	/* Get memory to put this msg */
 	req = otx2_mbox_alloc_msg_nix_txsch_alloc(&pfvf->mbox);
@@ -726,8 +727,24 @@ int otx2_txsch_alloc(struct otx2_nic *pfvf)
 	/* Request one schq per level */
 	for (lvl = 0; lvl < NIX_TXSCH_LVL_CNT; lvl++)
 		req->schq[lvl] = 1;
+	rc = otx2_sync_mbox_msg(&pfvf->mbox);
+	if (rc)
+		return rc;
 
-	return otx2_sync_mbox_msg(&pfvf->mbox);
+	rsp = (struct nix_txsch_alloc_rsp *)
+	      otx2_mbox_get_rsp(&pfvf->mbox.mbox, 0, &req->hdr);
+	if (IS_ERR(rsp))
+		return PTR_ERR(rsp);
+
+	/* Setup transmit scheduler list */
+	for (lvl = 0; lvl < NIX_TXSCH_LVL_CNT; lvl++)
+		for (schq = 0; schq < rsp->schq[lvl]; schq++)
+			pfvf->hw.txschq_list[lvl][schq] =
+				rsp->schq_list[lvl][schq];
+
+	pfvf->hw.txschq_link_cfg_lvl     = rsp->link_cfg_lvl;
+
+	return 0;
 }
 
 int otx2_txschq_stop(struct otx2_nic *pfvf)
@@ -1642,21 +1659,6 @@ void mbox_handler_cgx_fec_stats(struct otx2_nic *pfvf,
 	pfvf->hw.cgx_fec_uncorr_blks += rsp->fec_uncorr_blks;
 }
 
-void mbox_handler_nix_txsch_alloc(struct otx2_nic *pf,
-				  struct nix_txsch_alloc_rsp *rsp)
-{
-	int lvl, schq;
-
-	/* Setup transmit scheduler list */
-	for (lvl = 0; lvl < NIX_TXSCH_LVL_CNT; lvl++)
-		for (schq = 0; schq < rsp->schq[lvl]; schq++)
-			pf->hw.txschq_list[lvl][schq] =
-				rsp->schq_list[lvl][schq];
-
-	pf->hw.txschq_link_cfg_lvl = rsp->link_cfg_lvl;
-}
-EXPORT_SYMBOL(mbox_handler_nix_txsch_alloc);
-
 void mbox_handler_npa_lf_alloc(struct otx2_nic *pfvf,
 			       struct npa_lf_alloc_rsp *rsp)
 {
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
index 3f88975e13c1..9ed24bff6b2a 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
@@ -792,10 +792,6 @@ static void otx2_process_pfaf_mbox_msg(struct otx2_nic *pf,
 	case MBOX_MSG_NIX_LF_ALLOC:
 		mbox_handler_nix_lf_alloc(pf, (struct nix_lf_alloc_rsp *)msg);
 		break;
-	case MBOX_MSG_NIX_TXSCH_ALLOC:
-		mbox_handler_nix_txsch_alloc(pf,
-					     (struct nix_txsch_alloc_rsp *)msg);
-		break;
 	case MBOX_MSG_NIX_BP_ENABLE:
 		mbox_handler_nix_bp_enable(pf, (struct nix_bp_cfg_rsp *)msg);
 		break;
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
index c84804d16b8a..b7af02b12e05 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
@@ -70,10 +70,6 @@ static void otx2vf_process_vfaf_mbox_msg(struct otx2_nic *vf,
 	case MBOX_MSG_NIX_LF_ALLOC:
 		mbox_handler_nix_lf_alloc(vf, (struct nix_lf_alloc_rsp *)msg);
 		break;
-	case MBOX_MSG_NIX_TXSCH_ALLOC:
-		mbox_handler_nix_txsch_alloc(vf,
-					     (struct nix_txsch_alloc_rsp *)msg);
-		break;
 	case MBOX_MSG_NIX_BP_ENABLE:
 		mbox_handler_nix_bp_enable(vf, (struct nix_bp_cfg_rsp *)msg);
 		break;
-- 
2.17.1