diff mbox series

[3/9] common/cnxk: support flow control on LBK

Message ID 20211102155421.486-3-ndabilpuram@marvell.com (mailing list archive)
State Accepted, archived
Delegated to: Jerin Jacob
Headers
Series [1/9] common/cnxk: add code to write CPT CTX through microcode op |

Checks

Context Check Description
ci/checkpatch success coding style OK

Commit Message

Nithin Dabilpuram Nov. 2, 2021, 3:54 p.m. UTC 
  Support flow control enable/disable on LBK VF's as HW
supports backpressure on LBK links.

Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
---
 drivers/common/cnxk/roc_nix.c    |  6 ++++++
 drivers/common/cnxk/roc_nix_fc.c | 27 ++++++++++++++++++++-------
 2 files changed, 26 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/drivers/common/cnxk/roc_nix.c b/drivers/common/cnxk/roc_nix.c
index 949be80..fbfc550 100644
--- a/drivers/common/cnxk/roc_nix.c
+++ b/drivers/common/cnxk/roc_nix.c
@@ -414,6 +414,12 @@  roc_nix_dev_init(struct roc_nix *roc_nix)
 	nix->reta_sz = reta_sz;
 	nix->mtu = ROC_NIX_DEFAULT_HW_FRS;
 
+	/* Always start with full FC for LBK */
+	if (nix->lbk_link) {
+		nix->rx_pause = 1;
+		nix->tx_pause = 1;
+	}
+
 	/* Register error and ras interrupts */
 	rc = nix_register_irqs(nix);
 	if (rc)
diff --git a/drivers/common/cnxk/roc_nix_fc.c b/drivers/common/cnxk/roc_nix_fc.c
index 7eac7d0..ef46842 100644
--- a/drivers/common/cnxk/roc_nix_fc.c
+++ b/drivers/common/cnxk/roc_nix_fc.c
@@ -157,7 +157,7 @@  nix_fc_cq_config_set(struct roc_nix *roc_nix, struct roc_nix_fc_cfg *fc_cfg)
 int
 roc_nix_fc_config_get(struct roc_nix *roc_nix, struct roc_nix_fc_cfg *fc_cfg)
 {
-	if (roc_nix_is_vf_or_sdp(roc_nix))
+	if (roc_nix_is_vf_or_sdp(roc_nix) && !roc_nix_is_lbk(roc_nix))
 		return 0;
 
 	if (fc_cfg->cq_cfg_valid)
@@ -169,7 +169,7 @@  roc_nix_fc_config_get(struct roc_nix *roc_nix, struct roc_nix_fc_cfg *fc_cfg)
 int
 roc_nix_fc_config_set(struct roc_nix *roc_nix, struct roc_nix_fc_cfg *fc_cfg)
 {
-	if (roc_nix_is_vf_or_sdp(roc_nix))
+	if (roc_nix_is_vf_or_sdp(roc_nix) && !roc_nix_is_lbk(roc_nix))
 		return 0;
 
 	if (fc_cfg->cq_cfg_valid)
@@ -188,8 +188,17 @@  roc_nix_fc_mode_get(struct roc_nix *roc_nix)
 	enum roc_nix_fc_mode mode;
 	int rc = -ENOSPC;
 
-	if (roc_nix_is_lbk(roc_nix))
-		return ROC_NIX_FC_NONE;
+	/* Flow control on LBK link is always available */
+	if (roc_nix_is_lbk(roc_nix)) {
+		if (nix->tx_pause && nix->rx_pause)
+			return ROC_NIX_FC_FULL;
+		else if (nix->rx_pause)
+			return ROC_NIX_FC_RX;
+		else if (nix->tx_pause)
+			return ROC_NIX_FC_TX;
+		else
+			return ROC_NIX_FC_NONE;
+	}
 
 	req = mbox_alloc_msg_cgx_cfg_pause_frm(mbox);
 	if (req == NULL)
@@ -226,12 +235,16 @@  roc_nix_fc_mode_set(struct roc_nix *roc_nix, enum roc_nix_fc_mode mode)
 	uint8_t tx_pause, rx_pause;
 	int rc = -ENOSPC;
 
-	if (roc_nix_is_lbk(roc_nix))
-		return NIX_ERR_OP_NOTSUP;
-
 	rx_pause = (mode == ROC_NIX_FC_FULL) || (mode == ROC_NIX_FC_RX);
 	tx_pause = (mode == ROC_NIX_FC_FULL) || (mode == ROC_NIX_FC_TX);
 
+	/* Nothing much to do for LBK links */
+	if (roc_nix_is_lbk(roc_nix)) {
+		nix->rx_pause = rx_pause;
+		nix->tx_pause = tx_pause;
+		return 0;
+	}
+
 	req = mbox_alloc_msg_cgx_cfg_pause_frm(mbox);
 	if (req == NULL)
 		return rc;