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| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2014-04-02 14:20:37 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2014-04-07 01:48:57 -0700 |
| commit | a84bf9eedb550e38376008f32fcf0610867d3067 (patch) | |
| tree | 9aae6c0e39224c33afda078241cab6ab167ed940 /drivers/target | |
| parent | 66a3d5bc47d2973820816226e957db9e85285455 (diff) | |
| download | lwn-a84bf9eedb550e38376008f32fcf0610867d3067.tar.gz lwn-a84bf9eedb550e38376008f32fcf0610867d3067.zip | |
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')
| -rw-r--r-- | drivers/target/target_core_transport.c | 9 |
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); |