From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx> Hi MST, Paolo, Al & Co, Here is v4 patch series for vhost/scsi ANY_LAYOUT + VERSION_1 support. It updates vhost_virtqueue->handle_kick() -> vhost_scsi_handle_vq() callback code to determine the start of protection + data payloads iovecs past the starting virtio-scsi request + response headers. It also uses iovec out_size vs. req_size + iovec in_size vs. rsp_size in order to determine data_direction for use with Al's new iov_iter primitives. It assumes request/CDB and response/sense_buffer headers may span more than a single iovec using mm/iov_iter.c logic. It also allows virtio-scsi headers + T10_PI + Data SGL payloads to span the same iovec when pinning user-space memory via get_user_pages_fast() code. (Not tested yet) Based upon MST + Al's review feedback, the v3 -> v4 changes include: - Use iov_length() helper for out_size + in_size (MST) - Make out_iter init correct use out_size (MST) - Move data_direction + exp_data_len until after copy_from_iter() (MST) - Avoid specific ANY_LAYOUT wording in vhost_scsi_handle_vq() comments (MST) - Merge patch !ANY_LAYOUT removal into #5, use existing _vq() name (MST) - Further comments for vhost_scsi_handle_vq() code (Viro) - Fix iov_iter_init() to use proper WRITE/READ i->type assignment (Viro) Note the one part that has been left unchanged is vhost_scsi_map_to_sgl() into get_user_pages_fast(), for which existing iov_iter_get_pages() code will need to allow for a callback or *sgl parameter to perform the associated scatterlists setup from **pages for protection + data payloads. It's functioning against v3.19-rc1 virtio-scsi LLD in T10_PI mode using TYPE-1 DIF with ANY_LAYOUT -> VERSION_1 guest feature bits enabled, following existing layout convention with protection/data SGL payloads residing within seperate iovecs from virtio-scsi LLD guest. Please review. Thank you, --nab Nicholas Bellinger (8): vhost/scsi: Convert completion path to use copy_to_iter vhost/scsi: Fix incorrect early vhost_scsi_handle_vq failures vhost/scsi: Change vhost_scsi_map_to_sgl to accept iov ptr + len vhost/scsi: Add ANY_LAYOUT iov -> sgl mapping prerequisites vhost/scsi: Add ANY_LAYOUT support in vhost_scsi_handle_vq vhost/scsi: Set VIRTIO_F_ANY_LAYOUT + VIRTIO_F_VERSION_1 feature bits vhost/scsi: Drop left-over scsi_tcq.h include vhost/scsi: Global tcm_vhost -> vhost_scsi rename drivers/vhost/scsi.c | 1062 +++++++++++++++++++++++++------------------------- 1 file changed, 538 insertions(+), 524 deletions(-) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
