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And to eliminate an artificial constraint on # of user descriptors. The main idea here was to move from a single ring that covered all user descriptors to a pre-allocated ring per pre-allocated batch. In addition, the other major change here is in how we poll for completions. We used to poll the batch rings then the main ring. Now when commands are prepared their completion address is added to a per channel list and the poller simply runs through that list not caring which ring the completion address belongs too. This simplifies the completion logic considerably and will avoid polling locations that can't potentially have a completion. Some minor rework was included as well, mainly getting rid of the ring_ctrl struct as it didn't serve much of a purpose anyway and with how things are setup now its easier to read with all the elements in the channel struct. Also, a change that came in while this was WIP needed a few fixes to function correctly. Addressed those and moved them to a helper function so we have one point of control for xlations. Added support for NOP in cases where a batch is submitted with only 1 descriptor. Signed-off-by: paul luse <paul.e.luse@intel.com> Change-Id: Ie201b28118823100e908e0d1b08e7c10bb8fa9e7 Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/3654 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Community-CI: Mellanox Build Bot Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Ben Walker <benjamin.walker@intel.com> |
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