MC_START(9E) Driver Entry Points MC_START(9E)

NAME

mc_start, mc_stop - start and stop device entry points

SYNOPSIS

#include <sys/mac_provider.h>

int
prefix_m_start(void *driver);

void
prefix_m_stop(void *driver);

INTERFACE LEVEL

illumos DDI specific

PARAMETERS

driver A pointer to the driver's private data that was passed in via
the m_pdata member of the mac_register(9S) structure to the
mac_register(9F) function.

DESCRIPTION

The mc_start() entry point for a driver indicates that it should
initialize the chip to be ready to send or receive data. This entry
point is guaranteed to be called before any entry points that are
expected to be able to send and receive data. During this entry point,
most devices will allocate DMA resources, enable the link, and finish
performing any necessary device programming.

The mc_stop() entry point for a driver indicates that it should tear
down any allocated resources for the driver and, after the function
returns, it is not expected to perform any additional I/O.

The driver has access to its private data in the driver argument to
either function, which it should cast to the appropriate structure.
The system guarantees that only one of the mc_start() and mc_stop()
functions will be called at any given time for a given instance.
Similarly, these should not be called at the same time as a device's
attach(9E) or detach(9E) routine. However, the driver may have other
ongoing routines that it needs to protect against. The device driver
should always apply the appropriate locking techniques needed to ensure
that access to the data in its soft state is protected.

RETURN VALUES

Upon successful completion, device drivers should return 0 for the
mc_start() entry point. Otherwise, they should return a non-zero
positive error number to indicate the error that occurred.

SEE ALSO

mac(9E), mac_register(9F), mac_register(9S)

illumos May 31, 2016 illumos