K 10
svn:author
V 2
np
K 8
svn:date
V 27
2015-11-05T00:50:25.215449Z
K 7
svn:log
V 1258
cxgbe/tom: redo the TOM bits that support the iSCSI driver.

- There is no reason to have a special case for iSCSI in t4_rcvd.  Either there
  is data in the socket buffer (from when the connection was plain TOE, before
  being promoted to ulp_mode iSCSI) and sbused _should_ be taken into account,
  or sbused is 0 and doesn't affect the calculation of rx_credits.

- write_tx_wr doesn't need special handling for iSCSI either.  Its caller should
  specify the ulp_submode.

- Replace t4_ulp_push_frames with t4_push_pdus that can deal with PDUs in an
  mbufq hanging off the toepcb.  This eliminates the "backwards" calls from
  t4_tom's tx into the iSCSI driver.

- The iSCSI driver installs a handler for RX_ISCSI_DDP already and the iSCSI
  handler for RX_DATA_DDP is identical to the one for RX_ISCSI_DDP.  Take
  advantage of this to eliminate the last remaining "backwards" call from
  do_rx_data_ddp into the iSCSI driver.

- Eliminate the CXGBE_ISCSI_MBUF_TAG abomination.
  - For tx, it makes no sense to allocate an mbuf tag just to stash 2 bits worth
    of information.  Use a spare byte from the mbuf header instead.
  - For rx, the per-connection ulpcb is a more natural place to keep information
    about the PDU currently being assembled.

END