AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-18 22:06:49 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

IB/iser: Introduce pi_enable, pi_guard module parameters

Browse Source 
Use modparams to activate protection information support.

pi_enable bool: Based on this parameter iSER will know if it should
support T10-PI.  We don't want to do this by default as it requires to
allocate and initialize extra resources.  In case pi_enable=N, iSER
won't publish to SCSI midlayer any DIF capabilities.

pi_guard int: Based on this parameter iSER will publish DIX guard type
support to SCSI midlayer.  0 means CRC is allowed to be passed in DIX
buffers, 1 (or non-zero) means IP-CSUM is allowed to be passed in DIX
buffers.  Note that over the wire, only CRC is allowed.

In the next phase, it is worth considering passing these parameters
from iscsid via nlmsg.  This will allow these parameters to be
connection based rather than global.

Signed-off-by: Alex Tabachnik <alext@mellanox.com>
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Alex Tabachnik 2014-03-05 19:43:46 +02:00 committed by Roland Dreier
parent 5f588e3d0c
commit 7f73384752
3 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/infiniband/ulp/iser/iscsi_iser.c
View File

@ -82,6 +82,8 @@ static unsigned int iscsi_max_lun = 512;
module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
int iser_debug_level = 0;
bool iser_pi_enable = false;
int iser_pi_guard = 0;
MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover");
MODULE_LICENSE("Dual BSD/GPL");
@ -91,6 +93,12 @@ MODULE_VERSION(DRV_VER);
module_param_named(debug_level, iser_debug_level, int, 0644);
MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
module_param_named(pi_enable, iser_pi_enable, bool, 0644);
MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)");
module_param_named(pi_guard, iser_pi_guard, int, 0644);
MODULE_PARM_DESC(pi_guard, "T10-PI guard_type, 0:CRC|1:IP_CSUM (default:CRC)");
struct iser_global ig;
void

3
drivers/infiniband/ulp/iser/iscsi_iser.h
View File

@ -317,6 +317,7 @@ struct iser_conn {
unsigned int rx_desc_head;
struct iser_rx_desc *rx_descs;
struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX];
bool pi_support;
/* Connection memory registration pool */
union {
@ -371,6 +372,8 @@ struct iser_global {
extern struct iser_global ig;
extern int iser_debug_level;
extern bool iser_pi_enable;
extern int iser_pi_guard;
/* allocate connection resources needed for rdma functionality */
int iser_conn_set_full_featured_mode(struct iscsi_conn *conn);

13
drivers/infiniband/ulp/iser/iser_verbs.c
View File

@ -607,6 +607,19 @@ static int iser_addr_handler(struct rdma_cm_id *cma_id)
ib_conn = (struct iser_conn *)cma_id->context;
ib_conn->device = device;
/* connection T10-PI support */
if (iser_pi_enable) {
if (!(device->dev_attr.device_cap_flags &
IB_DEVICE_SIGNATURE_HANDOVER)) {
iser_warn("T10-PI requested but not supported on %s, "
"continue without T10-PI\n",
ib_conn->device->ib_device->name);
ib_conn->pi_support = false;
} else {
ib_conn->pi_support = true;
}
}
ret = rdma_resolve_route(cma_id, 1000);
if (ret) {
iser_err("resolve route failed: %d\n", ret);