Can be reproduced with "make EXTRA_CFLAGS='-O1'" command using
gcc 7.3.0
Build error
In file included from .../drivers/event/octeontx2/ot
x2_evdev.c:15:0:
.../drivers/event/octeontx2/otx2_evdev_stats.h:
In function ‘otx2_sso_xstats_get’:
.../drivers/event/octeontx2/otx2_evdev_stats.h:124:9:
error: ‘xstats’ may be used uninitialized in this function
[-Werror=maybe-uninitialized]
xstat = &xstats[ids[i] - start_offset];
~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This is false positive, 'xstats_mode_count' should be preventing taking
the loop and accessing 'xstats'.
Returning in that case to silence the compiler warning.
Reported-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Tested-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>
OcteonTx2 AP core SSO cache contains two entries each entry caches
state of an single GWS aka event port.
AP core requests events from SSO by using following sequence :
1. Write to SSOW_LF_GWS_OP_GET_WORK
2. Wait for SSO to complete scheduling by polling on SSOW_LF_GWS_TAG[63]
3. SSO notifies core by clearing SSOW_LF_GWS_TAG[63] and if work is
valid SSOW_LF_GWS_WQP is non-zero.
The above sequence uses only one in-core cache entry.
In dual workslot mode we try to use both the in-core cache entries by
triggering GET_WORK on a second workslot as soon as the above sequence
completes. This effectively hides the schedule latency of SSO if there
are enough events with unique flow_tags in-flight.
This mode reserves two SSO GWS lf's for each event port effectively
doubling single core performance.
Dual workslot mode is the default mode of operation in octeontx2.
Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
Signed-off-by: Jerin Jacob <jerinj@marvell.com>
Add support for retrieving statistics from SSO GWS and GGRP.
Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
Signed-off-by: Jerin Jacob <jerinj@marvell.com>
Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
