From: Nicholas Bellinger <[email protected]> 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. Cc: Martin K. Petersen <[email protected]> Cc: Sagi Grimberg <[email protected]> Cc: Or Gerlitz <[email protected]> Cc: Quinn Tran <[email protected]> Cc: Giridhar Malavali <[email protected]> Signed-off-by: Nicholas Bellinger <[email protected]> --- drivers/target/target_core_transport.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 9c820ba..530a9e8 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_write_insert(cmd); + } if (target_handle_task_attr(cmd)) { spin_lock_irq(&cmd->t_state_lock); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
