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Target/dif: Introduce protection-passthough-only mode

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Some transports (iSCSI/iSER/SRP/FC) support hardware INSERT/STRIP
capabilities while other transports like loopback/vhost-scsi need
perform this is software.

This patch allows fabrics using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC
to signal the early LUN scan handling case where PROTECT CDB bits
are set, but no fabric buffer has been provided.

For transports which use generic new command these buffers have yet
to be allocated.

Also this way, target may support protection information
against legacy initiators (writes are inserted and reads
are stripped).

(Only set prot_pto for loopback during early special case - nab)

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Sagi Grimberg
2014-02-19 17:50:17 +02:00
committed by Nicholas Bellinger
parent 80dcd0c104
commit b5b8e2989e
4 changed files with 13 additions and 6 deletions
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include/target/target_core_base.h
+1
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@@ -570,6 +570,7 @@ struct se_cmd {
enum target_prot_ho prot_handover;
sense_reason_t pi_err;
sector_t bad_sector;
bool prot_pto;
};
struct se_ua {