|MAC_HCKSUM_GET(9F)||Kernel Functions for Drivers||MAC_HCKSUM_GET(9F)|
mac_hcksum_get(const mblk_t *mp,
uint32_t *start, uint32_t
*stuff, uint32_t *end, uint32_t
*value, uint32_t *flags);
uint32_t start, uint32_t stuff,
uint32_t end, uint32_t value,
mac_hcksum_set() functions are provided to device drivers to get and set checksum related information. When a device driver indicates that it supports the MAC_CAPAB_HCKSUM capability as part of its mc_getcapab(9E) entry point, then it is responsible for calling these functions appropriately during the transmit and receive paths.
While both functions operate on an mblk_t, this function should only be called on the first mblk_t that begins a given individual frame in a chain. In other words, it only works on entries where it is the first of many possible entries linked together by the b_cont member. The first mblk_t received from any mac(9E) API or pointed to by a b_next pointer should be used.
mac_hcksum_set() function to indicate what checksum information has occurred.
The proper values to set depend on the flags passed in. The following flags are supported when receiving data, note that they may have different meanings from when transmitting data. The driver should set the flags argument to the bitwise inclusive OR of the following values:
The HCK_PARTIALCKSUM, HCK_FULLCKSUM, and HCK_FULLCKSUM_OK flags are all mutually exclusive. A device driver should only set one of the three flags.
If one of the arguments is not required based on the specified value of flags, then the device driver should set any remaining arguments to 0.
mac_hcksum_get() function to determine what hardware checksumming options are required to be performed by the hardware. While the device driver may need the other fields, it must check the flags argument to determine what it is being requested to do. The following values may be set in flags:
The flags that the device driver will get will depend on what the device driver has advertised that it supports in response to the mc_getcapab(9E) query for the MAC_CAPAB_HCKSUM capability.
The HCK_PARTIALCKSUM and HCK_FULLCKSUM flags are mutually exclusive.
mac_hcksum_set() functions may be called from any context.
|March 15, 2018||OmniOS|