[v5,08/14] bus/vmbus: add sub-channel mapping support
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Commit Message
To map the subchannels, an mmap request is directly made after
determining the subchan memory offset
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 | 48 +++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
@@ -18,6 +18,13 @@
#include "private.h"
#include "vmbus_unix.h"
+/*
+ * Macros to distinguish mmap request
+ * [7-0] - Device memory region
+ * [15-8]- Sub-channel id
+ */
+#define UH_SUBCHAN_MASK_SHIFT 8
+
const char *driver_name = "hv_uio";
/* Check map names with kernel names */
@@ -99,6 +106,47 @@ int vmbus_get_device_info_os(struct rte_vmbus_device *dev)
return sysctl_get_vmbus_device_info(dev);
}
+int vmbus_uio_map_subchan_os(const struct rte_vmbus_device *dev,
+ const struct vmbus_channel *chan,
+ void **mapaddr, size_t *size)
+{
+ char ring_path[PATH_MAX];
+ off_t offset;
+ int fd;
+
+ snprintf(ring_path, sizeof(ring_path),
+ "/dev/hv_uio%d", dev->uio_num);
+
+ fd = open(ring_path, O_RDWR);
+ if (fd < 0) {
+ VMBUS_LOG(ERR, "Cannot open %s: %s",
+ ring_path, strerror(errno));
+ return -errno;
+ }
+
+ /* subchannel rings are of the same size as primary */
+ *size = dev->resource[HV_TXRX_RING_MAP].len;
+ offset = (chan->relid << UH_SUBCHAN_MASK_SHIFT) * PAGE_SIZE;
+
+ *mapaddr = vmbus_map_resource(vmbus_map_addr, fd,
+ offset, *size, 0);
+ close(fd);
+
+ if (*mapaddr == MAP_FAILED)
+ return -EIO;
+
+ return 0;
+}
+
+/* This function should always succeed */
+bool vmbus_uio_subchannels_supported(const struct rte_vmbus_device *dev,
+ const struct vmbus_channel *chan)
+{
+ RTE_SET_USED(dev);
+ RTE_SET_USED(chan);
+ return true;
+}
+
const char *get_devname_os(void)
{
return "/dev/hv_uio";