It is true that on the send path for such a QP you can send any sort of packet. The user of the QP is required to build the MAC header and the NIC will wrap the post_sent data in an Ethernet type II frame which includes the tailing CRC.
On the receive path this QP assume an MAC header. The qp attach GID value gets the multicast MAC destination address to catch the correct ingress packets. Bottom line is that I think IBV_QPT_RAW_ETH is a good name. If not I would like to recommend to use IBV_QPT_RAW_PACKET which hold a resemblance to "socket(AF_PACKET, SOCK_RAW,...)" On the other hand, I never fully understood what does IBV_QPT_RAW_ETY stand for? Maybe we should change its name to better represent what the code does. _________________ Alex Rosenbaum -----Original Message----- From: Walukiewicz, Miroslaw [mailto:miroslaw.walukiew...@intel.com] Sent: Wednesday, June 23, 2010 1:21 PM To: Moni Shoua; linux-rdma Cc: Roland Dreier; Alex Rosenbaum Subject: RE: Name for a new type of QP I would prefer a name IBV_QPT_FRAME so it is a L2 layerQP. The packet is reserved for L3. Regards, Mirek -----Original Message----- From: Moni Shoua [mailto:mo...@voltaire.com] Sent: Wednesday, June 23, 2010 11:20 AM To: linux-rdma Cc: Walukiewicz, Miroslaw; Roland Dreier; al...@voltaire.com Subject: Name for a new type of QP Hi, This message follows a discussion in the EWG mailing list. We want to promote a patch that enables use of a new QP type. This QP type lets the user post_send() data to its SQ and treat it as the entire packet, including headers. An example of use with this QP is sending Ethernet packets from userspace (and enjoying kernel bypass). An open question in this matter it how should we call this QP type. The first name IBV_QPT_RAW_ETH seems to be too similar to the existing type IBV_QPT_RAW_ETY. My suggestion (that were posted in a different thread) are IBV_QPT_FRAME IBV_QPT_PACKET IBV_QPT_NOHDR Please make your comments and send your suggestions. When we decide about a name we will send a patch that enables the use of this QP type. thanks Moni -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
