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authorNicholas Bellinger <nab@linux-iscsi.org>2014-04-02 14:20:37 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2014-04-07 01:48:57 -0700
commita84bf9eedb550e38376008f32fcf0610867d3067 (patch)
tree9aae6c0e39224c33afda078241cab6ab167ed940 /drivers/target/target_core_transport.c
parent66a3d5bc47d2973820816226e957db9e85285455 (diff)
downloadlinux-stericsson-a84bf9eedb550e38376008f32fcf0610867d3067.tar.gz
target: Enable WRITE_INSERT emulation in target_execute_cmd
This patch enables WRITE_INSERT emulation in target_execute_cmd() in order to locally generate DIF PI before submitting the WRITE to the underlying backend device. This is required for fabric drivers that currently don't support DIF over-the-wire, in order to inact with backend devices that have hardware (IBLOCK) or software (FILEIO + RAMDISK) support for handling T10 PI. v2 changes: - Convert to sbc_dif_generate() usage (Sagi) Reviewed-by: Sagi Grimberg <sagig@mellanox.com> Cc: Martin K. Petersen <martin.petersen@oracle.com> Cc: Or Gerlitz <ogerlitz@mellanox.com> Cc: Quinn Tran <quinn.tran@qlogic.com> Cc: Giridhar Malavali <giridhar.malavali@qlogic.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/target_core_transport.c')
-rw-r--r--drivers/target/target_core_transport.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 9c820ba5ae82..a7a4ef2d589e 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1767,6 +1767,15 @@ void target_execute_cmd(struct se_cmd *cmd)
cmd->t_state = TRANSPORT_PROCESSING;
cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
spin_unlock_irq(&cmd->t_state_lock);
+ /*
+ * Perform WRITE_INSERT of PI using software emulation when backend
+ * device has PI enabled, if the transport has not already generated
+ * PI using hardware WRITE_INSERT offload.
+ */
+ if (cmd->prot_op == TARGET_PROT_DOUT_INSERT) {
+ if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
+ sbc_dif_generate(cmd);
+ }
if (target_handle_task_attr(cmd)) {
spin_lock_irq(&cmd->t_state_lock);