Hi Jose,
On 5/28/2018 4:26 PM, Jose Abreu wrote:
Hi Bhadram,
On 28-05-2018 10:15, Bhadram Varka wrote:
Hi Jose,
On 5/25/2018 8:02 PM, Jose Abreu wrote:
On 25-05-2018 15:25, Bhadram Varka wrote:
Hi Jose,
On 5/25/2018 7:35 PM, Jose Abreu wrote:
Hi Bhadram,
On 25-05-2018 05:41, Bhadram Varka wrote:
Hi Jose,
On 5/24/2018 3:01 PM, Jose Abreu wrote:
Hi Bhadram,
On 24-05-2018 06:58, Bhadram Varka wrote:
After some time if check Tx descriptor status - then I see
only
below
[..]
[85788.286730] 027 [0x827951b0]: 0xf854f000 0x0 0x16d8
0x90000000
index 025 and 026 descriptors processed but not index 027.
At this stage Tx DMA is always in below state -
■ 3'b011: Running (Reading Data from system memory
buffer and queuing it to the Tx buffer (Tx FIFO))
Thats strange, I think the descriptors look okay though. I
will
need the registers values (before the lock) and, if
possible, the
git bisect output.
Attaching the register dump file after the issue observed.
Please check once.
----->8-----
0x112c = 0x0000003F
0x11ac = 0x0000003F
0x122c = 0x0000003F
0x12ac = 0x0000003F
0x1130 = 0x0000003F
0x11b0 = 0x0000003F
0x1230 = 0x0000003F
0x12b0 = 0x0000003F
----->8-----
This can't be right, it should be DMA_{RX/TX}_SIZE - 1 =
511. Did
you change these values in the code?
Yes. I have changed the descriptor length to 64 - so that
searching for the current descriptor status would be easy.
Ok, it shouldn't impact anything. The only thing I'm remembering
now is that you can have TSO not enabled in all DMA channels (HW
configuration allows this). Please check if TSO in single-queue
works.
TSO works fine if only single queue enabled. I don't see any
limitation from HW side because TSO works fine with other
driver which we received from Synopsys with IP drop.
You need to check with HW team if TSO is enabled for all channels
because you can have TSO channels < DMA channels and there is no
way to confirm this in the registers. Also check if received
driver is routing packets to queue != 0.
Root caused the issue to TxPBL settings. In current configuration driver
using the TxPBL = 32 which will be fine for single channel but its not
recommended settings for multi-queue scenario. Recommended setting for
TxPBL is half of the queue size.
o Total MTL Tx queue size - 16KB
o For multi-queue - total size divided by number of queues -
(16KB/4) = 4KB for each queue.
o So we need to set the TxPBL value so that we can place memory request
for 2KB from system memory. For this to achieve we need to set TxPBL=16.
Thanks for the help in debugging.
--
Thanks,
Bhadram.
