> > But protocols are associated with QPs. I'm not sure *why* an AH is > > linked to a PD. Conceptually the association seems unnecessary. > > The AH has to be linked to the PD because the PD specifies the > hardware target and the AH is a hardware object. All objects must be > traced back to a PD. It is linked to a PD not a QP because the AH can > be shared across all QPs, which is useful for UD applications.. > > The AH is really similar to the ethernet layer in an IP stack, and the > QP > is akin the TCP layer. I always viewed the AH as specifying the route to the destination port. Locally, I still don't see why it couldn't work across the device, like the CQ does. Associating it with a PD just seems to limit which QPs, and by association the memory buffers, it can be used with. So, I'm still not seeing the reason for the linkage... -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
