From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
This updated -v3 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 -v3 include:
- Convert iscsi_portal_group->np_login_lock to ->np_login_sem
- Add new LOGIN_FLAGS_* definitions
- Convert iscsi_target_sk_data_ready() lock access to
write[lock,unlock]_bh()
- Only clear LOGIN_FLAGS_READ_ACTIVE when iscsi_target_do_login()
returns zero
- Add LOGIN_FLAGS_READY + LOGIN_FLAGS_CLOSED bit checks to
iscsi_target_sk_data_ready()
- Make INIT_DELAYED_WORK() + iscsi_target_set_sock_callbacks() setup
happen earlier by moving from iscsi_target_start_negotiation() into
iscsi_target_locate_portal()
- Set LOGIN_FLAGS_READY bit in iscsi_target_start_negotiation()
after iscsi_target_do_login() returns zero.
- Add sk->sk_state_change to cleanup after TCP failure
- Add explicit sk_state_check to iscsi_target_do_login()
- Use sk->sk_sndtimeo -> sk->sk_rcvtimeo settings during login
- Drop unnecessary LOGIN_FLAGS_READ_ACTIVE bit set in
isert_rx_login_req()
This is the final series ahead of the initial v3.12-rc1 merge.
Thank you,
--nab
Nicholas Bellinger (5):
iscsi-target: Prepare login code for multi-plexing support
iscsi-target: Add login negotiation multi-plexing support
iscsi-target: Add sk->sk_state_change to cleanup after TCP failure
iscsi-target: Remove left-over iscsi_target_do_login_io
iser-target: Updates for login negotiation multi-plexing support
drivers/infiniband/ulp/isert/ib_isert.c | 14 ++-
drivers/target/iscsi/iscsi_target.c | 55 +++---
drivers/target/iscsi/iscsi_target.h | 6 +-
drivers/target/iscsi/iscsi_target_core.h | 18 ++-
drivers/target/iscsi/iscsi_target_login.c | 162 ++++++++------
drivers/target/iscsi/iscsi_target_login.h | 3 +
drivers/target/iscsi/iscsi_target_nego.c | 335 +++++++++++++++++++++++++++-
drivers/target/iscsi/iscsi_target_tpg.c | 25 ++-
drivers/target/iscsi/iscsi_target_tpg.h | 4 +-
9 files changed, 500 insertions(+), 122 deletions(-)
--
1.7.2.5
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