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| author | Ilias Tsitsimpis <iliastsi@arrikto.com> | 2015-04-23 21:30:09 +0300 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2015-05-30 22:41:47 -0700 |
| commit | e4648b014e03baee45d5f5146c1219b19e4e5f2f (patch) | |
| tree | 652bf355631417eb402589d9a479454507d8c444 /Documentation/target | |
| parent | f97ec7db1606875666366bfcba8476f8c917db96 (diff) | |
| download | linux-e4648b014e03baee45d5f5146c1219b19e4e5f2f.tar.gz linux-e4648b014e03baee45d5f5146c1219b19e4e5f2f.tar.bz2 linux-e4648b014e03baee45d5f5146c1219b19e4e5f2f.zip | |
target/user: Add support for bidirectional commands
Enable TCMU to handle bidirectional SCSI commands. In such cases,
entries in iov[] cover both the Data-In and the Data-Out buffers. The
first iov_cnt entries correspond to the Data-Out buffer, while the
remaining iov_bidi_cnt entries correspond to the Data-In buffer.
Signed-off-by: Ilias Tsitsimpis <iliastsi@arrikto.com>
Signed-off-by: Vangelis Koukis <vkoukis@arrikto.com>
Reviewed-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'Documentation/target')
| -rw-r--r-- | Documentation/target/tcmu-design.txt | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/target/tcmu-design.txt b/Documentation/target/tcmu-design.txt index 263b907517ac..bef81e42788f 100644 --- a/Documentation/target/tcmu-design.txt +++ b/Documentation/target/tcmu-design.txt @@ -152,7 +152,7 @@ overall shared memory region, not the entry. The data in/out buffers are accessible via tht req.iov[] array. iov_cnt contains the number of entries in iov[] needed to describe either the Data-In or Data-Out buffers. For bidirectional commands, iov_cnt specifies how many iovec -entries cover the Data-Out area, and iov_bidi_count specifies how many +entries cover the Data-Out area, and iov_bidi_cnt specifies how many iovec entries immediately after that in iov[] cover the Data-In area. Just like other fields, iov.iov_base is an offset from the start of the region. |