diff options
| author |   Vladimir Oltean <vladimir.oltean@nxp.com> | 2021-01-15 04:11:11 +0200 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2021-01-15 20:02:33 -0800 |
| commit | f6fe01d6fa24dd3c89996ad82780872441e86bfa (patch) | |
| tree | a7c777abe0cf64de277e2358cb006476387f0054 /include/soc | |
| parent | Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next (diff) | |
| download | linux-dev-f6fe01d6fa24dd3c89996ad82780872441e86bfa.tar.xz linux-dev-f6fe01d6fa24dd3c89996ad82780872441e86bfa.zip | |
net: mscc: ocelot: auto-detect packet buffer size and number of frame references
Instead of reading these values from the reference manual and writing
them down into the driver, it appears that the hardware gives us the
option of detecting them dynamically.
The number of frame references corresponds to what the reference manual
notes, however it seems that the frame buffers are reported as slightly
less than the books would indicate. On VSC9959 (Felix), the books say it
should have 128KB of packet buffer, but the registers indicate only
129840 bytes (126.79 KB). Also, the unit of measurement for FREECNT from
the documentation of all these devices is incorrect (taken from an older
generation). This was confirmed by Younes Leroul from Microchip support.
Not having anything better to do with these values at the moment* (this
will change soon), let's just print them.
*The frame buffer size is, in fact, used to calculate the tail dropping
watermarks.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/soc')
| -rw-r--r-- | include/soc/mscc/ocelot.h | 3 | ||||
| -rw-r--r-- | include/soc/mscc/ocelot_qsys.h | 3 |
2 files changed, 5 insertions, 1 deletions
diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h index f3db75c0172b..c17a372335cd 100644 --- a/include/soc/mscc/ocelot.h +++ b/include/soc/mscc/ocelot.h @@ -607,7 +607,8 @@ struct ocelot { const struct ocelot_stat_layout *stats_layout; unsigned int num_stats; - int shared_queue_sz; + int packet_buffer_size; + int num_frame_refs; int num_mact_rows; struct net_device *hw_bridge_dev; diff --git a/include/soc/mscc/ocelot_qsys.h b/include/soc/mscc/ocelot_qsys.h index a814bc2017d8..b7b263a19068 100644 --- a/include/soc/mscc/ocelot_qsys.h +++ b/include/soc/mscc/ocelot_qsys.h @@ -77,6 +77,9 @@ #define QSYS_RES_STAT_MAXUSE(x) ((x) & GENMASK(11, 0)) #define QSYS_RES_STAT_MAXUSE_M GENMASK(11, 0) +#define QSYS_MMGT_EQ_CTRL_FP_FREE_CNT(x) ((x) & GENMASK(15, 0)) +#define QSYS_MMGT_EQ_CTRL_FP_FREE_CNT_M GENMASK(15, 0) + #define QSYS_EVENTS_CORE_EV_FDC(x) (((x) << 2) & GENMASK(4, 2)) #define QSYS_EVENTS_CORE_EV_FDC_M GENMASK(4, 2) #define QSYS_EVENTS_CORE_EV_FDC_X(x) (((x) & GENMASK(4, 2)) >> 2) |