[dpdk-dev] [PATCH v2] net/octeontx2: update red algo for shaper dynamic update

[Nithin Dabilpuram <nithind1988@gmail.com>]

From: Nithin Dabilpuram <ndabilpuram@marvell.com>

Due to an errata red algo needs to be set to discard instead of stall
for 96XX C0 silicon for two rate shaping. This workaround is being
already handled for newly created hierarchy but not for dynamic
shaper update cases. This patch hence applies the workaround
even when for shaper dynamic update.

Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
---
v2:
- Rebased patch to fix dependency issue

 drivers/net/octeontx2/otx2_tm.c | 39 +++++++++++++++++++++++++++------------
 drivers/net/octeontx2/otx2_tm.h |  1 +
 2 files changed, 28 insertions(+), 12 deletions(-)

diff --git a/drivers/net/octeontx2/otx2_tm.c b/drivers/net/octeontx2/otx2_tm.c
index f94618d..b57e10f 100644
--- a/drivers/net/octeontx2/otx2_tm.c
+++ b/drivers/net/octeontx2/otx2_tm.c
@@ -237,6 +237,30 @@ shaper_config_to_nix(struct otx2_nix_tm_shaper_profile *profile,
 						 &pir->burst_mantissa);
 }
 
+static void
+shaper_default_red_algo(struct otx2_eth_dev *dev,
+			struct otx2_nix_tm_node *tm_node,
+			struct otx2_nix_tm_shaper_profile *profile)
+{
+	struct shaper_params cir, pir;
+
+	/* C0 doesn't support STALL when both PIR & CIR are enabled */
+	if (profile && otx2_dev_is_96xx_Cx(dev)) {
+		memset(&cir, 0, sizeof(cir));
+		memset(&pir, 0, sizeof(pir));
+		shaper_config_to_nix(profile, &cir, &pir);
+
+		if (pir.rate && cir.rate) {
+			tm_node->red_algo = NIX_REDALG_DISCARD;
+			tm_node->flags |= NIX_TM_NODE_RED_DISCARD;
+			return;
+		}
+	}
+
+	tm_node->red_algo = NIX_REDALG_STD;
+	tm_node->flags &= ~NIX_TM_NODE_RED_DISCARD;
+}
+
 static int
 populate_tm_tl1_default(struct otx2_eth_dev *dev, uint32_t schq)
 {
@@ -744,7 +768,6 @@ nix_tm_node_add_to_list(struct otx2_eth_dev *dev, uint32_t node_id,
 {
 	struct otx2_nix_tm_shaper_profile *profile;
 	struct otx2_nix_tm_node *tm_node, *parent_node;
-	struct shaper_params cir, pir;
 	uint32_t profile_id;
 
 	profile_id = params->shaper_profile_id;
@@ -778,19 +801,9 @@ nix_tm_node_add_to_list(struct otx2_eth_dev *dev, uint32_t node_id,
 	if (profile)
 		profile->reference_count++;
 
-	memset(&cir, 0, sizeof(cir));
-	memset(&pir, 0, sizeof(pir));
-	shaper_config_to_nix(profile, &cir, &pir);
-
 	tm_node->parent = parent_node;
 	tm_node->parent_hw_id = UINT32_MAX;
-	/* C0 doesn't support STALL when both PIR & CIR are enabled */
-	if (lvl < OTX2_TM_LVL_QUEUE &&
-	    otx2_dev_is_96xx_Cx(dev) &&
-	    pir.rate && cir.rate)
-		tm_node->red_algo = NIX_REDALG_DISCARD;
-	else
-		tm_node->red_algo = NIX_REDALG_STD;
+	shaper_default_red_algo(dev, tm_node, profile);
 
 	TAILQ_INSERT_TAIL(&dev->node_list, tm_node, node);
 
@@ -2500,6 +2513,8 @@ otx2_nix_tm_node_shaper_update(struct rte_eth_dev *eth_dev,
 	if (rc)
 		return rc;
 
+	shaper_default_red_algo(dev, tm_node, profile);
+
 	/* Update the PIR/CIR and clear SW XOFF */
 	req = otx2_mbox_alloc_msg_nix_txschq_cfg(mbox);
 	req->lvl = tm_node->hw_lvl;
diff --git a/drivers/net/octeontx2/otx2_tm.h b/drivers/net/octeontx2/otx2_tm.h
index 9675182..4a80c23 100644
--- a/drivers/net/octeontx2/otx2_tm.h
+++ b/drivers/net/octeontx2/otx2_tm.h
@@ -46,6 +46,7 @@ struct otx2_nix_tm_node {
 #define NIX_TM_NODE_HWRES	BIT_ULL(0)
 #define NIX_TM_NODE_ENABLED	BIT_ULL(1)
 #define NIX_TM_NODE_USER	BIT_ULL(2)
+#define NIX_TM_NODE_RED_DISCARD BIT_ULL(3)
 	/* Shaper algorithm for RED state @NIX_REDALG_E */
 	uint32_t red_algo:2;
 
-- 
2.8.4