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target: Add internal WRITE_STRIP support

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This patch adds WRITE_STRIP support in target_write_prot_action() that
invokes sbc_dif_verify_write() for checking T10-PI metadata before
submitting the I/O to a backend driver.

Upon verify failure, the specific sense code is propigated up the
failure path up to transport_generic_request_failure().

Also, update sbc_dif_verify_write() to only perform the subsequent
protection metadata copy when a valid *sg is passed.

(Use ilog2 instead of division and unlikely for pi_err - Sagi)

Reviewed-by: Martin Petersen <martin.petersen@oracle.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2015-02-08 03:06:17 -08:00
parent aa58b53168
commit 5132d1e655
2 changed files with 19 additions and 0 deletions
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3
drivers/target/target_core_sbc.c
View file

@ -1342,6 +1342,9 @@ sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors,
kunmap_atomic(paddr);
kunmap_atomic(daddr);
}
if (!sg)
return 0;
sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off);
return 0;

16
drivers/target/target_core_transport.c
View file

@ -1740,6 +1740,7 @@ void __target_execute_cmd(struct se_cmd *cmd)
static int target_write_prot_action(struct se_cmd *cmd)
{
u32 sectors;
/*
* Perform WRITE_INSERT of PI using software emulation when backend
* device has PI enabled, if the transport has not already generated
@ -1750,6 +1751,21 @@ static int target_write_prot_action(struct se_cmd *cmd)
if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
sbc_dif_generate(cmd);
break;
case TARGET_PROT_DOUT_STRIP:
if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
break;
sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
cmd->pi_err = sbc_dif_verify_write(cmd, cmd->t_task_lba,
sectors, 0, NULL, 0);
if (unlikely(cmd->pi_err)) {
spin_lock_irq(&cmd->t_state_lock);
cmd->transport_state &= ~CMD_T_BUSY|CMD_T_SENT;
spin_unlock_irq(&cmd->t_state_lock);
transport_generic_request_failure(cmd, cmd->pi_err);
return -1;
}
break;
default:
break;
}