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Date: Thu, 22 Aug 2013 05:04:44 +0000
From: "Nicholas A. Bellinger" <nab@...erainc.com>
To: target-devel <target-devel@...r.kernel.org>
Cc: lkml <linux-kernel@...r.kernel.org>,
linux-scsi <linux-scsi@...r.kernel.org>,
Nicholas Bellinger <nab@...erainc.com>,
Roland Dreier <roland@...estorage.com>,
Giridhar Malavali <giridhar.malavali@...gic.com>,
Chad Dupuis <chad.dupuis@...gic.com>,
Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH] target/tcm_qla2xxx: Add/use target_reverse_dma_direction() in target_core_fabric.h
From: Nicholas Bellinger <nab@...erainc.com>
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@....de>
Cc: Roland Dreier <roland@...estorage.com>
Cc: Giridhar Malavali <giridhar.malavali@...gic.com>
Cc: Chad Dupuis <chad.dupuis@...gic.com>
Cc: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Nicholas Bellinger <nab@...erainc.com>
---
drivers/scsi/qla2xxx/tcm_qla2xxx.c | 31 +++----------------------------
include/target/target_core_fabric.h | 26 ++++++++++++++++++++++++++
2 files changed, 29 insertions(+), 28 deletions(-)
diff --git a/drivers/scsi/qla2xxx/tcm_qla2xxx.c b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
index 6a93a91..f790fca 100644
--- a/drivers/scsi/qla2xxx/tcm_qla2xxx.c
+++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
@@ -497,38 +497,13 @@ static u32 tcm_qla2xxx_sess_get_index(struct se_session *se_sess)
return 0;
}
-/*
- * 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 enum dma_data_direction tcm_qla2xxx_mapping_dir(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;
- }
-}
-
static int tcm_qla2xxx_write_pending(struct se_cmd *se_cmd)
{
struct qla_tgt_cmd *cmd = container_of(se_cmd,
struct qla_tgt_cmd, se_cmd);
cmd->bufflen = se_cmd->data_length;
- cmd->dma_data_direction = tcm_qla2xxx_mapping_dir(se_cmd);
+ cmd->dma_data_direction = target_reverse_dma_direction(se_cmd);
cmd->sg_cnt = se_cmd->t_data_nents;
cmd->sg = se_cmd->t_data_sg;
@@ -664,7 +639,7 @@ static int tcm_qla2xxx_queue_data_in(struct se_cmd *se_cmd)
struct qla_tgt_cmd, se_cmd);
cmd->bufflen = se_cmd->data_length;
- cmd->dma_data_direction = tcm_qla2xxx_mapping_dir(se_cmd);
+ cmd->dma_data_direction = target_reverse_dma_direction(se_cmd);
cmd->aborted = (se_cmd->transport_state & CMD_T_ABORTED);
cmd->sg_cnt = se_cmd->t_data_nents;
@@ -688,7 +663,7 @@ static int tcm_qla2xxx_queue_status(struct se_cmd *se_cmd)
cmd->sg = NULL;
cmd->sg_cnt = 0;
cmd->offset = 0;
- cmd->dma_data_direction = tcm_qla2xxx_mapping_dir(se_cmd);
+ cmd->dma_data_direction = target_reverse_dma_direction(se_cmd);
cmd->aborted = (se_cmd->transport_state & CMD_T_ABORTED);
if (se_cmd->data_direction == DMA_FROM_DEVICE) {
diff --git a/include/target/target_core_fabric.h b/include/target/target_core_fabric.h
index 192eb52..882b650e 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 */
--
1.7.10.4
--
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