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target: Allow control CDBs with data > 1 page 

We need to handle >1 page control cdbs, so extend the code to do a vmap
if bigger than 1 page. It seems like kmap() is still preferable if just
a page, fewer TLB shootdowns(?), so keep using that when possible.

Rename function pair for their new scope.

Signed-off-by: Andy Grover <agrover@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Andy Grover 2012-01-16 16:57:08 -08:00 committed by Nicholas Bellinger
parent e8904dc500
commit 4949314c72
8 changed files with 80 additions and 56 deletions
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8
drivers/target/target_core_alua.c
View File

@ -78,7 +78,7 @@ int target_emulate_report_target_port_groups(struct se_task *task)
return -EINVAL;
}
buf = transport_kmap_first_data_page(cmd);
buf = transport_kmap_data_sg(cmd);
spin_lock(&su_dev->t10_alua.tg_pt_gps_lock);
list_for_each_entry(tg_pt_gp, &su_dev->t10_alua.tg_pt_gps_list,
@ -163,7 +163,7 @@ int target_emulate_report_target_port_groups(struct se_task *task)
buf[2] = ((rd_len >> 8) & 0xff);
buf[3] = (rd_len & 0xff);
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);
@ -194,7 +194,7 @@ int target_emulate_set_target_port_groups(struct se_task *task)
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
buf = transport_kmap_first_data_page(cmd);
buf = transport_kmap_data_sg(cmd);
/*
* Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed
@ -351,7 +351,7 @@ int target_emulate_set_target_port_groups(struct se_task *task)
}
out:
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);
return 0;

28
drivers/target/target_core_cdb.c
View File

@ -83,7 +83,7 @@ target_emulate_inquiry_std(struct se_cmd *cmd)
return -EINVAL;
}
buf = transport_kmap_first_data_page(cmd);
buf = transport_kmap_data_sg(cmd);
if (dev == tpg->tpg_virt_lun0.lun_se_dev) {
buf[0] = 0x3f; /* Not connected */
@ -134,7 +134,7 @@ target_emulate_inquiry_std(struct se_cmd *cmd)
buf[4] = 31; /* Set additional length to 31 */
out:
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
return 0;
}
@ -716,7 +716,7 @@ int target_emulate_inquiry(struct se_task *task)
return -EINVAL;
}
buf = transport_kmap_first_data_page(cmd);
buf = transport_kmap_data_sg(cmd);
buf[0] = dev->transport->get_device_type(dev);
@ -733,7 +733,7 @@ int target_emulate_inquiry(struct se_task *task)
ret = -EINVAL;
out_unmap:
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
out:
if (!ret) {
task->task_scsi_status = GOOD;
@ -755,7 +755,7 @@ int target_emulate_readcapacity(struct se_task *task)
else
blocks = (u32)blocks_long;
buf = transport_kmap_first_data_page(cmd);
buf = transport_kmap_data_sg(cmd);
buf[0] = (blocks >> 24) & 0xff;
buf[1] = (blocks >> 16) & 0xff;
@ -771,7 +771,7 @@ int target_emulate_readcapacity(struct se_task *task)
if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
put_unaligned_be32(0xFFFFFFFF, &buf[0]);
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);
@ -785,7 +785,7 @@ int target_emulate_readcapacity_16(struct se_task *task)
unsigned char *buf;
unsigned long long blocks = dev->transport->get_blocks(dev);
buf = transport_kmap_first_data_page(cmd);
buf = transport_kmap_data_sg(cmd);
buf[0] = (blocks >> 56) & 0xff;
buf[1] = (blocks >> 48) & 0xff;
@ -806,7 +806,7 @@ int target_emulate_readcapacity_16(struct se_task *task)
if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
buf[14] = 0x80;
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);
@ -1019,9 +1019,9 @@ int target_emulate_modesense(struct se_task *task)
offset = cmd->data_length;
}
rbuf = transport_kmap_first_data_page(cmd);
rbuf = transport_kmap_data_sg(cmd);
memcpy(rbuf, buf, offset);
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);
@ -1043,7 +1043,7 @@ int target_emulate_request_sense(struct se_task *task)
return -ENOSYS;
}
buf = transport_kmap_first_data_page(cmd);
buf = transport_kmap_data_sg(cmd);
if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) {
/*
@ -1089,7 +1089,7 @@ int target_emulate_request_sense(struct se_task *task)
}
end:
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);
return 0;
@ -1123,7 +1123,7 @@ int target_emulate_unmap(struct se_task *task)
dl = get_unaligned_be16(&cdb[0]);
bd_dl = get_unaligned_be16(&cdb[2]);
buf = transport_kmap_first_data_page(cmd);
buf = transport_kmap_data_sg(cmd);
ptr = &buf[offset];
pr_debug("UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"
@ -1147,7 +1147,7 @@ int target_emulate_unmap(struct se_task *task)
}
err:
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
if (!ret) {
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);

4
drivers/target/target_core_device.c
View File

@ -657,7 +657,7 @@ int target_report_luns(struct se_task *se_task)
unsigned char *buf;
u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
buf = transport_kmap_first_data_page(se_cmd);
buf = (unsigned char *) transport_kmap_data_sg(se_cmd);
/*
* If no struct se_session pointer is present, this struct se_cmd is
@ -695,7 +695,7 @@ int target_report_luns(struct se_task *se_task)
* See SPC3 r07, page 159.
*/
done:
transport_kunmap_first_data_page(se_cmd);
transport_kunmap_data_sg(se_cmd);
lun_count *= 8;
buf[0] = ((lun_count >> 24) & 0xff);
buf[1] = ((lun_count >> 16) & 0xff);

38
drivers/target/target_core_pr.c
View File

@ -1535,7 +1535,7 @@ static int core_scsi3_decode_spec_i_port(
tidh_new->dest_local_nexus = 1;
list_add_tail(&tidh_new->dest_list, &tid_dest_list);
buf = transport_kmap_first_data_page(cmd);
buf = transport_kmap_data_sg(cmd);
/*
* For a PERSISTENT RESERVE OUT specify initiator ports payload,
* first extract TransportID Parameter Data Length, and make sure
@ -1786,7 +1786,7 @@ static int core_scsi3_decode_spec_i_port(
}
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
/*
* Go ahead and create a registrations from tid_dest_list for the
@ -1834,7 +1834,7 @@ static int core_scsi3_decode_spec_i_port(
return 0;
out:
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
/*
* For the failure case, release everything from tid_dest_list
* including *dest_pr_reg and the configfs dependances..
@ -3411,14 +3411,14 @@ static int core_scsi3_emulate_pro_register_and_move(
* will be moved to for the TransportID containing SCSI initiator WWN
* information.
*/
buf = transport_kmap_first_data_page(cmd);
buf = transport_kmap_data_sg(cmd);
rtpi = (buf[18] & 0xff) << 8;
rtpi |= buf[19] & 0xff;
tid_len = (buf[20] & 0xff) << 24;
tid_len |= (buf[21] & 0xff) << 16;
tid_len |= (buf[22] & 0xff) << 8;
tid_len |= buf[23] & 0xff;
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
buf = NULL;
if ((tid_len + 24) != cmd->data_length) {
@ -3470,7 +3470,7 @@ static int core_scsi3_emulate_pro_register_and_move(
return -EINVAL;
}
buf = transport_kmap_first_data_page(cmd);
buf = transport_kmap_data_sg(cmd);
proto_ident = (buf[24] & 0x0f);
#if 0
pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
@ -3504,7 +3504,7 @@ static int core_scsi3_emulate_pro_register_and_move(
goto out;
}
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
buf = NULL;
pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
@ -3769,13 +3769,13 @@ after_iport_check:
" REGISTER_AND_MOVE\n");
}
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
core_scsi3_put_pr_reg(dest_pr_reg);
return 0;
out:
if (buf)
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
if (dest_se_deve)
core_scsi3_lunacl_undepend_item(dest_se_deve);
if (dest_node_acl)
@ -3849,7 +3849,7 @@ int target_scsi3_emulate_pr_out(struct se_task *task)
scope = (cdb[2] & 0xf0);
type = (cdb[2] & 0x0f);
buf = transport_kmap_first_data_page(cmd);
buf = transport_kmap_data_sg(cmd);
/*
* From PERSISTENT_RESERVE_OUT parameter list (payload)
*/
@ -3867,7 +3867,7 @@ int target_scsi3_emulate_pr_out(struct se_task *task)
aptpl = (buf[17] & 0x01);
unreg = (buf[17] & 0x02);
}
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
buf = NULL;
/*
@ -3967,7 +3967,7 @@ static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
return -EINVAL;
}
buf = transport_kmap_first_data_page(cmd);
buf = transport_kmap_data_sg(cmd);
buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
@ -4001,7 +4001,7 @@ static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
buf[6] = ((add_len >> 8) & 0xff);
buf[7] = (add_len & 0xff);
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
return 0;
}
@ -4027,7 +4027,7 @@ static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
return -EINVAL;
}
buf = transport_kmap_first_data_page(cmd);
buf = transport_kmap_data_sg(cmd);
buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
@ -4086,7 +4086,7 @@ static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
err:
spin_unlock(&se_dev->dev_reservation_lock);
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
return 0;
}
@ -4110,7 +4110,7 @@ static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
return -EINVAL;
}
buf = transport_kmap_first_data_page(cmd);
buf = transport_kmap_data_sg(cmd);
buf[0] = ((add_len << 8) & 0xff);
buf[1] = (add_len & 0xff);
@ -4142,7 +4142,7 @@ static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
return 0;
}
@ -4172,7 +4172,7 @@ static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
return -EINVAL;
}
buf = transport_kmap_first_data_page(cmd);
buf = transport_kmap_data_sg(cmd);
buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
@ -4293,7 +4293,7 @@ static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
buf[6] = ((add_len >> 8) & 0xff);
buf[7] = (add_len & 0xff);
transport_kunmap_first_data_page(cmd);
transport_kunmap_data_sg(cmd);
return 0;
}

4
drivers/target/target_core_pscsi.c
View File

@ -693,7 +693,7 @@ static int pscsi_transport_complete(struct se_task *task)
if (task->task_se_cmd->se_deve->lun_flags &
TRANSPORT_LUNFLAGS_READ_ONLY) {
unsigned char *buf = transport_kmap_first_data_page(task->task_se_cmd);
unsigned char *buf = transport_kmap_data_sg(task->task_se_cmd);
if (cdb[0] == MODE_SENSE_10) {
if (!(buf[3] & 0x80))
@ -703,7 +703,7 @@ static int pscsi_transport_complete(struct se_task *task)
buf[2] |= 0x80;
}
transport_kunmap_first_data_page(task->task_se_cmd);
transport_kunmap_data_sg(task->task_se_cmd);
}
}
after_mode_sense:

49
drivers/target/target_core_transport.c
View File

@ -3084,11 +3084,6 @@ static int transport_generic_cmd_sequencer(
(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
goto out_unsupported_cdb;
/* Let's limit control cdbs to a page, for simplicity's sake. */
if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
size > PAGE_SIZE)
goto out_invalid_cdb_field;
transport_set_supported_SAM_opcode(cmd);
return ret;
@ -3492,9 +3487,11 @@ int transport_generic_map_mem_to_cmd(
}
EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
void *transport_kmap_first_data_page(struct se_cmd *cmd)
void *transport_kmap_data_sg(struct se_cmd *cmd)
{
struct scatterlist *sg = cmd->t_data_sg;
struct page **pages;
int i;
BUG_ON(!sg);
/*
@ -3502,15 +3499,41 @@ void *transport_kmap_first_data_page(struct se_cmd *cmd)
* tcm_loop who may be using a contig buffer from the SCSI midlayer for
* control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
*/
return kmap(sg_page(sg)) + sg->offset;
}
EXPORT_SYMBOL(transport_kmap_first_data_page);
if (!cmd->t_data_nents)
return NULL;
else if (cmd->t_data_nents == 1)
return kmap(sg_page(sg)) + sg->offset;
void transport_kunmap_first_data_page(struct se_cmd *cmd)
{
kunmap(sg_page(cmd->t_data_sg));
/* >1 page. use vmap */
pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
if (!pages)
return NULL;
/* convert sg[] to pages[] */
for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
pages[i] = sg_page(sg);
}
cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
kfree(pages);
if (!cmd->t_data_vmap)
return NULL;
return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
}
EXPORT_SYMBOL(transport_kunmap_first_data_page);
EXPORT_SYMBOL(transport_kmap_data_sg);
void transport_kunmap_data_sg(struct se_cmd *cmd)
{
if (!cmd->t_data_nents)
return;
else if (cmd->t_data_nents == 1)
kunmap(sg_page(cmd->t_data_sg));
vunmap(cmd->t_data_vmap);
cmd->t_data_vmap = NULL;
}
EXPORT_SYMBOL(transport_kunmap_data_sg);
static int
transport_generic_get_mem(struct se_cmd *cmd)

4
include/target/target_core_backend.h
View File

@ -59,7 +59,7 @@ int transport_set_vpd_ident_type(struct t10_vpd *, unsigned char *);
int transport_set_vpd_ident(struct t10_vpd *, unsigned char *);
/* core helpers also used by command snooping in pscsi */
void *transport_kmap_first_data_page(struct se_cmd *);
void transport_kunmap_first_data_page(struct se_cmd *);
void *transport_kmap_data_sg(struct se_cmd *);
void transport_kunmap_data_sg(struct se_cmd *);
#endif /* TARGET_CORE_BACKEND_H */

1
include/target/target_core_base.h
View File

@ -582,6 +582,7 @@ struct se_cmd {
struct scatterlist *t_data_sg;
unsigned int t_data_nents;
void *t_data_vmap;
struct scatterlist *t_bidi_data_sg;
unsigned int t_bidi_data_nents;