[PATCH v3 03/15] bus/vmbus: get device resource values using sysctl

[Srikanth Kaka <srikanth.k@oneconvergence.com>]

The UIO device's relid, monitor id, etc values are retrieved using
following sysctl variables:
$ sysctl dev.hv_uio.0
dev.hv_uio.0.send_buf.gpadl: 925241
dev.hv_uio.0.send_buf.size: 16777216
dev.hv_uio.0.recv_buf.gpadl: 925240
dev.hv_uio.0.recv_buf.size: 32505856
dev.hv_uio.0.monitor_page.size: 4096
dev.hv_uio.0.int_page.size: 4096

Signed-off-by: Srikanth Kaka <srikanth.k@oneconvergence.com>
Signed-off-by: Vag Singh <vag.singh@oneconvergence.com>
Signed-off-by: Anand Thulasiram <avelu@juniper.net>
---
 drivers/bus/vmbus/freebsd/vmbus_uio.c | 142 ++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 drivers/bus/vmbus/freebsd/vmbus_uio.c

diff --git a/drivers/bus/vmbus/freebsd/vmbus_uio.c b/drivers/bus/vmbus/freebsd/vmbus_uio.c
new file mode 100644
index 0000000000..2059ab192b
--- /dev/null
+++ b/drivers/bus/vmbus/freebsd/vmbus_uio.c
@@ -0,0 +1,142 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright (c) 2018, Microsoft Corporation.
+ * All Rights Reserved.
+ */
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <sys/ioctl.h>
+
+#include <rte_log.h>
+#include <rte_bus.h>
+#include <rte_malloc.h>
+#include <rte_bus_vmbus.h>
+
+#include "private.h"
+
+const char *driver_name = "hv_uio";
+
+/* Check map names with kernel names */
+static const char *map_names[VMBUS_MAX_RESOURCE] = {
+	[HV_TXRX_RING_MAP] = "txrx_rings",
+	[HV_INT_PAGE_MAP]  = "int_page",
+	[HV_MON_PAGE_MAP]  = "monitor_page",
+	[HV_RECV_BUF_MAP]  = "recv_buf",
+	[HV_SEND_BUF_MAP]  = "send_buf",
+};
+
+void
+vmbus_uio_free_resource(struct rte_vmbus_device *dev,
+		struct mapped_vmbus_resource *uio_res)
+{
+	rte_free(uio_res);
+
+	if (dev->intr_handle.uio_cfg_fd >= 0) {
+		close(dev->intr_handle.uio_cfg_fd);
+		dev->intr_handle.uio_cfg_fd = -1;
+	}
+
+	if (dev->intr_handle.fd >= 0) {
+		close(dev->intr_handle.fd);
+		dev->intr_handle.fd = -1;
+		dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
+	}
+}
+
+static int
+sysctl_get_vmbus_device_info(struct rte_vmbus_device *dev)
+{
+	char sysctlBuffer[PATH_MAX];
+	char sysctlVar[PATH_MAX];
+	size_t len = PATH_MAX, sysctl_len;
+	unsigned long tmp;
+	int i;
+
+	snprintf(sysctlBuffer, len, "dev.%s.%d", driver_name, dev->uio_num);
+
+	sysctl_len = sizeof(unsigned long);
+	/* get relid */
+	snprintf(sysctlVar, len, "%s.channel.ch_id", sysctlBuffer);
+	if (sysctlbyname(sysctlVar, &tmp, &sysctl_len, NULL, 0) < 0) {
+		VMBUS_LOG(ERR, "could not read %s", sysctlVar);
+		goto error;
+	}
+	dev->relid = tmp;
+
+	/* get monitor id */
+	snprintf(sysctlVar, len, "%s.channel.%u.monitor_id", sysctlBuffer,
+		 dev->relid);
+	if (sysctlbyname(sysctlVar, &tmp, &sysctl_len, NULL, 0) < 0) {
+		VMBUS_LOG(ERR, "could not read %s", sysctlVar);
+		goto error;
+	}
+	dev->monitor_id = tmp;
+
+	/* Extract resource value */
+	for (i = 0; i < VMBUS_MAX_RESOURCE; i++) {
+		struct rte_mem_resource *res = &dev->resource[i];
+		unsigned long size, gpad = 0;
+		size_t sizelen = sizeof(len);
+
+		snprintf(sysctlVar, sizeof(sysctlVar), "%s.%s.size",
+			 sysctlBuffer, map_names[i]);
+		if (sysctlbyname(sysctlVar, &size, &sizelen, NULL, 0) < 0) {
+			VMBUS_LOG(ERR,
+				"could not read %s", sysctlVar);
+			goto error;
+		}
+		res->len = size;
+
+		if (i == HV_RECV_BUF_MAP || i == HV_SEND_BUF_MAP) {
+			snprintf(sysctlVar, sizeof(sysctlVar), "%s.%s.gpadl",
+				 sysctlBuffer, map_names[i]);
+			if (sysctlbyname(sysctlVar, &gpad, &sizelen, NULL, 0) < 0) {
+				VMBUS_LOG(ERR,
+					"could not read %s", sysctlVar);
+				goto error;
+			}
+			/* put the GPAD value in physical address */
+			res->phys_addr = gpad;
+		}
+	}
+	return 0;
+error:
+	return -1;
+}
+
+int
+vmbus_uio_alloc_resource(struct rte_vmbus_device *dev,
+			 struct mapped_vmbus_resource **uio_res)
+{
+	char devname[PATH_MAX]; /* contains the /dev/hv_uioX */
+
+	/* save fd if in primary process */
+	snprintf(devname, sizeof(devname), "/dev/hv_uio%u", dev->uio_num);
+	dev->intr_handle.fd = open(devname, O_RDWR);
+	if (dev->intr_handle.fd < 0) {
+		VMBUS_LOG(ERR, "Cannot open %s: %s",
+			devname, strerror(errno));
+		goto error;
+	}
+	dev->intr_handle.type = RTE_INTR_HANDLE_UIO_INTX;
+
+	/* allocate the mapping details for secondary processes*/
+	*uio_res = rte_zmalloc("UIO_RES", sizeof(**uio_res), 0);
+	if (*uio_res == NULL) {
+		VMBUS_LOG(ERR, "cannot store uio mmap details");
+		goto error;
+	}
+
+	strlcpy((*uio_res)->path, devname, PATH_MAX);
+	rte_uuid_copy((*uio_res)->id, dev->device_id);
+
+	if (sysctl_get_vmbus_device_info(dev) < 0)
+		goto error;
+
+	return 0;
+error:
+	vmbus_uio_free_resource(dev, *uio_res);
+	return -1;
+}
-- 
2.30.2