User Manual

Rev 2.1-1.0.6
Mellanox Technologies
81
The additional operands are carried in the Extended Transport Header. Atomic response genera-
tion and packet format for MskCmpSwap is as for standard IB Atomic operations.
4.7.1.2 Masked Fetch and Add (MFetchAdd)
The MFetchAdd Atomic operation extends the functionality of the standard IB FetchAdd by
allowing the user to split the target into multiple fields of selectable length. The atomic add is
done independently on each one of this fields. A bit set in the field_boundary parameter specifies
the field boundaries. The pseudocode below describes the operation:
4.8 Ethernet Tunneling Over IPoIB Driver (eIPoIB)
The eth_ipoib driver provides a standard Ethernet interface to be used as a Physical Interface
(PIF) into the Hypervisor virtual network, and serves one or more Virtual Interfaces (VIF). This
driver supports L2 Switching (Direct Bridging) as well as other L3 Switching modes (e.g. NAT).
This document explains the configuration and driver behavior when configured in Bridging
mode.
| *va = (*va & ~(swap_mask)) | (swap & swap_mask)
|
| return atomic_response
| bit_adder(ci, b1, b2, *co)
| {
| value = ci + b1 + b2
| *co = !!(value & 2)
|
| return value & 1
| }
|
| #define MASK_IS_SET(mask, attr) (!!((mask)&(attr)))
| bit_position = 1
| carry = 0
| atomic_response = 0
|
| for i = 0 to 63
| {
| if ( i != 0 )
| bit_position = bit_position << 1
|
| bit_add_res = bit_adder(carry, MASK_IS_SET(*va, bit_position),
| MASK_IS_SET(compare_add, bit_position), &new_carry)
| if (bit_add_res)
| atomic_response |= bit_position
|
| carry = ((new_carry) && (!MASK_IS_SET(compare_add_mask, bit_position)))
| }
|
| return atomic_response