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>

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);