Hi Bill,
On Fri, 24 Oct 2014 09:21:36 -0500 Bill Fischofer <[email protected]>
wrote:
> Headroom (and tailroom) are meta data associated with packets and are not
> hard-coded like this. See the ODP Packet Design doc for details. Based on
> Tuesday's call I'm revising the doc to be clearer as to how this works so
> look for a follow-on post here later today.
Thanks.
Currently, 'odp_pktio_set_headroom' is not implemented for linux-generic.
Thus, ETHBUF_ALIGN is an (existing) implmentation detail used by
linux-generic's internal 'setup_pkt_sock':
It assists in calculating 'pkt_sock->frame_offset' for the socket.
This is later used when arming buffers for the recv call, e.g. in
recv_pkt_sock_basic:
l2_hdr = pkt_buf + pkt_sock->frame_offset;
recv_bytes = recvfrom(sockfd, l2_hdr,
pkt_sock->max_frame_len, MSG_DONTWAIT,
(struct sockaddr *)&sll, &addrlen);
So my motivation was modifying existing internal implementation detail
of linux-generic/odp_packet_socket.c ;)
Will linux-generic/odp_packet_socket.c be revised once
'odp_pktio_set_headroom' gets implemented for linux-generic?
Regards,
Shmulik
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