[dpdk-dev] [PATCH v3 07/46] net/liquidio: add API to disable IO queues

[Shijith Thotton <shijith.thotton@caviumnetworks.com>]

Signed-off-by: Shijith Thotton <shijith.thotton@caviumnetworks.com>
Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Signed-off-by: Derek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: Venkat Koppula <venkat.koppula@caviumnetworks.com>
Signed-off-by: Srisivasubramanian S <ssrinivasan@caviumnetworks.com>
Signed-off-by: Mallesham Jatharakonda <mjatharakonda@oneconvergence.com>
---
 drivers/net/liquidio/base/lio_23xx_vf.c | 49 +++++++++++++++++++++++++++++++++
 drivers/net/liquidio/base/lio_23xx_vf.h |  7 +++++
 drivers/net/liquidio/lio_ethdev.c       |  5 ++++
 3 files changed, 61 insertions(+)

diff --git a/drivers/net/liquidio/base/lio_23xx_vf.c b/drivers/net/liquidio/base/lio_23xx_vf.c
index dd5e3a6..d9b9e2a 100644
--- a/drivers/net/liquidio/base/lio_23xx_vf.c
+++ b/drivers/net/liquidio/base/lio_23xx_vf.c
@@ -65,3 +65,52 @@
 
 	return 0;
 }
+
+int
+cn23xx_vf_set_io_queues_off(struct lio_device *lio_dev)
+{
+	uint32_t loop = CN23XX_VF_BUSY_READING_REG_LOOP_COUNT;
+	uint64_t q_no;
+
+	/* Disable the i/p and o/p queues for this Octeon.
+	 * IOQs will already be in reset.
+	 * If RST bit is set, wait for Quiet bit to be set
+	 * Once Quiet bit is set, clear the RST bit
+	 */
+	PMD_INIT_FUNC_TRACE();
+
+	for (q_no = 0; q_no < lio_dev->sriov_info.rings_per_vf; q_no++) {
+		volatile uint64_t reg_val;
+
+		reg_val = lio_read_csr64(lio_dev,
+					 CN23XX_SLI_IQ_PKT_CONTROL64(q_no));
+		while ((reg_val & CN23XX_PKT_INPUT_CTL_RST) && !(reg_val &
+					 CN23XX_PKT_INPUT_CTL_QUIET) && loop) {
+			reg_val = lio_read_csr64(
+					lio_dev,
+					CN23XX_SLI_IQ_PKT_CONTROL64(q_no));
+			loop = loop - 1;
+		}
+
+		if (loop == 0) {
+			lio_dev_err(lio_dev,
+				    "clearing the reset reg failed or setting the quiet reg failed for qno %lu\n",
+				    (unsigned long)q_no);
+			return -1;
+		}
+
+		reg_val = reg_val & ~CN23XX_PKT_INPUT_CTL_RST;
+		lio_write_csr64(lio_dev, CN23XX_SLI_IQ_PKT_CONTROL64(q_no),
+				reg_val);
+
+		reg_val = lio_read_csr64(lio_dev,
+					 CN23XX_SLI_IQ_PKT_CONTROL64(q_no));
+		if (reg_val & CN23XX_PKT_INPUT_CTL_RST) {
+			lio_dev_err(lio_dev, "unable to reset qno %lu\n",
+				    (unsigned long)q_no);
+			return -1;
+		}
+	}
+
+	return 0;
+}
diff --git a/drivers/net/liquidio/base/lio_23xx_vf.h b/drivers/net/liquidio/base/lio_23xx_vf.h
index 1c234bf..1af09d0 100644
--- a/drivers/net/liquidio/base/lio_23xx_vf.h
+++ b/drivers/net/liquidio/base/lio_23xx_vf.h
@@ -80,5 +80,12 @@
 	return default_lio_conf;
 }
 
+/** Turns off the input and output queues for the device
+ *  @param lio_dev which device io queues to disable
+ */
+int cn23xx_vf_set_io_queues_off(struct lio_device *lio_dev);
+
+#define CN23XX_VF_BUSY_READING_REG_LOOP_COUNT	100000
+
 int cn23xx_vf_setup_device(struct lio_device  *lio_dev);
 #endif /* _LIO_23XX_VF_H_  */
diff --git a/drivers/net/liquidio/lio_ethdev.c b/drivers/net/liquidio/lio_ethdev.c
index 734f6c4..0487f3d 100644
--- a/drivers/net/liquidio/lio_ethdev.c
+++ b/drivers/net/liquidio/lio_ethdev.c
@@ -86,6 +86,11 @@
 		return -1;
 	}
 
+	if (cn23xx_vf_set_io_queues_off(lio_dev)) {
+		lio_dev_err(lio_dev, "Setting io queues off failed\n");
+		return -1;
+	}
+
 	dpdk_queues = (int)lio_dev->sriov_info.rings_per_vf;
 
 	lio_dev->max_tx_queues = dpdk_queues;
-- 
1.8.3.1