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| author | Nicholas Bellinger <nab@daterainc.com> | 2013-08-21 14:54:54 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2013-09-10 16:48:35 -0700 |
| commit | b3faa2e87ce04e48f16f3823977329b7c367b3f9 (patch) | |
| tree | 796a8722df5ffa66e29936f5cfdf4624e536208a /include/target | |
| parent | cf6d1f0964fa9db57fc660caf51939d7a03359a1 (diff) | |
| download | linux-b3faa2e87ce04e48f16f3823977329b7c367b3f9.tar.gz | |
target/tcm_qla2xxx: Add/use target_reverse_dma_direction() in target_core_fabric.h
Reversing the dma_data_direction for pci_map_sg() friends is useful for other drivers, so move it from tcm_qla2xxx into inline code within target_core_fabric.h. Also drop internal usage of equivlient in tcm_qla2xxx fabric code. Reported-by: Christoph Hellwig <hch@lst.de> Cc: Roland Dreier <roland@purestorage.com> Cc: Giridhar Malavali <giridhar.malavali@qlogic.com> Cc: Chad Dupuis <chad.dupuis@qlogic.com> Cc: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Nicholas Bellinger <nab@daterainc.com>
Diffstat (limited to 'include/target')
| -rw-r--r-- | include/target/target_core_fabric.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/target/target_core_fabric.h b/include/target/target_core_fabric.h index 192eb52684e9..882b650e32be 100644 --- a/include/target/target_core_fabric.h +++ b/include/target/target_core_fabric.h @@ -179,4 +179,30 @@ u32 iscsi_get_pr_transport_id_len(struct se_portal_group *, struct se_node_acl * char *iscsi_parse_pr_out_transport_id(struct se_portal_group *, const char *, u32 *, char **); +/* + * The LIO target core uses DMA_TO_DEVICE to mean that data is going + * to the target (eg handling a WRITE) and DMA_FROM_DEVICE to mean + * that data is coming from the target (eg handling a READ). However, + * this is just the opposite of what we have to tell the DMA mapping + * layer -- eg when handling a READ, the HBA will have to DMA the data + * out of memory so it can send it to the initiator, which means we + * need to use DMA_TO_DEVICE when we map the data. + */ +static inline enum dma_data_direction +target_reverse_dma_direction(struct se_cmd *se_cmd) +{ + if (se_cmd->se_cmd_flags & SCF_BIDI) + return DMA_BIDIRECTIONAL; + + switch (se_cmd->data_direction) { + case DMA_TO_DEVICE: + return DMA_FROM_DEVICE; + case DMA_FROM_DEVICE: + return DMA_TO_DEVICE; + case DMA_NONE: + default: + return DMA_NONE; + } +} + #endif /* TARGET_CORE_FABRICH */ |