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From:   Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
To:     grygorii.strashko@ti.com, davem@davemloft.net
Cc:     corbet@lwn.net, akpm@linux-foundation.org, netdev@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-omap@vger.kernel.org, vinicius.gomes@intel.com,
        henrik@austad.us, jesus.sanchez-palencia@intel.com,
        Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Subject: [RFC PATCH 5/6] net: ethernet: ti: cpsw: restore shaper configuration while down/up
Date:   Sat, 19 May 2018 00:15:09 +0300
Message-Id: <20180518211510.13341-6-ivan.khoronzhuk@linaro.org>
In-Reply-To: <20180518211510.13341-1-ivan.khoronzhuk@linaro.org>
References: <20180518211510.13341-1-ivan.khoronzhuk@linaro.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Need to restore shapers configuration after interface was down/up.
This is needed as appropriate configuration is still replicated in
kernel settings. This only shapers context restore, so vlan
configuration should be restored by user if needed, especially for
devices with one port where vlan frames are sent via ALE.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
---
 drivers/net/ethernet/ti/cpsw.c | 47 ++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index c7710b0e1c17..c3e88be36c1b 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -1807,6 +1807,51 @@ static int cpsw_set_cbs(struct net_device *ndev,
 	return ret;
 }
 
+static void cpsw_cbs_resume(struct cpsw_slave *slave, struct cpsw_priv *priv)
+{
+	int fifo, bw;
+
+	for (fifo = CPSW_FIFO_SHAPERS_NUM; fifo > 0; fifo--) {
+		bw = priv->fifo_bw[fifo];
+		if (!bw)
+			continue;
+
+		cpsw_set_fifo_rlimit(priv, fifo, bw);
+	}
+}
+
+static void cpsw_mqprio_resume(struct cpsw_slave *slave, struct cpsw_priv *priv)
+{
+	struct cpsw_common *cpsw = priv->cpsw;
+	u32 tx_prio_map = 0;
+	int i, tc, fifo;
+	u32 tx_prio_rg;
+
+	if (!priv->mqprio_hw)
+		return;
+
+	for (i = 0; i < 8; i++) {
+		tc = netdev_get_prio_tc_map(priv->ndev, i);
+		fifo = CPSW_FIFO_SHAPERS_NUM - tc;
+		tx_prio_map |= fifo << (4 * i);
+	}
+
+	tx_prio_rg = cpsw->version == CPSW_VERSION_1 ?
+		     CPSW1_TX_PRI_MAP : CPSW2_TX_PRI_MAP;
+
+	slave_write(slave, tx_prio_map, tx_prio_rg);
+}
+
+/* restore resources after port reset */
+static void cpsw_restore(struct cpsw_priv *priv)
+{
+	/* restore MQPRIO offload */
+	for_each_slave(priv, cpsw_mqprio_resume, priv);
+
+	/* restore CBS offload */
+	for_each_slave(priv, cpsw_cbs_resume, priv);
+}
+
 static int cpsw_ndo_open(struct net_device *ndev)
 {
 	struct cpsw_priv *priv = netdev_priv(ndev);
@@ -1886,6 +1931,8 @@ static int cpsw_ndo_open(struct net_device *ndev)
 
 	}
 
+	cpsw_restore(priv);
+
 	/* Enable Interrupt pacing if configured */
 	if (cpsw->coal_intvl != 0) {
 		struct ethtool_coalesce coal;
-- 
2.17.0