From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Hi folks,
This -v2 series for v3.12-rc1 adds support for login multi-plexing,
that allows subsequent login request/request PDUs beyond the initial
exchange to be pushed off to workqueue process context, so that other
incoming login requests can be serviced in parallel.
This addresses a long-standing issue with login latency with many (100's)
of parallel login requests to the same network portal being shared
across many (100's) of TargetName+TargetPortalGroup endpoints.
Note that login negotiation to the same TargetName+TargetPortalGroup
endpoint is still sychronized in order to enforce session reinstatement
state machines.
The changes for v2 include:
- Fix iscsit_transport reference leak during NP thread reset
- Remove duplicate call to iscsi_post_login_handler() in
__iscsi_target_login_thread()
- Drop unused iscsi_np->np_login_tpg
- Add login_timer in iscsi_target_do_login_rx() to avoid
possible endless sleep with MSG_WAITALL for traditional
iscsi-target in certain network configurations.
- Convert lprintk() -> pr_debug()
- Remove forward declarations of iscsi_target_set_sock_callbacks(),
iscsi_target_restore_sock_callbacks() and iscsi_target_sk_data_ready()
- Make iscsi_target_set_sock_callbacks + iscsi_target_restore_sock_callbacks()
static (Fengguang)
- Make iscsi_target_do_login_rx() safe for iser-target w/o conn->sock
- Updates to iser-target for login negotiation multi-plexing support
The main remaining FIXME is to keep track of connections that are pushed
out to workqueue process context for explicit network portal shutdown
purposes.
Thanks!
--nab
Nicholas Bellinger (4):
iscsi-target: Fix iscsit_transport reference leak during NP thread
reset
iscsi-target: Prepare login code for multi-plexing support
iscsi-target: Add login negotiation multi-plexing support
iser-target: Updates for login negotiation multi-plexing support
drivers/infiniband/ulp/isert/ib_isert.c | 17 +++-
drivers/target/iscsi/iscsi_target.c | 53 ++++----
drivers/target/iscsi/iscsi_target.h | 6 +-
drivers/target/iscsi/iscsi_target_core.h | 12 ++-
drivers/target/iscsi/iscsi_target_login.c | 171 +++++++++++++----------
drivers/target/iscsi/iscsi_target_login.h | 3 +
drivers/target/iscsi/iscsi_target_nego.c | 209 +++++++++++++++++++++++++++-
drivers/target/iscsi/iscsi_target_tpg.c | 23 +++-
drivers/target/iscsi/iscsi_target_tpg.h | 4 +-
9 files changed, 378 insertions(+), 120 deletions(-)
--
1.7.2.5
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