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List: linux-rdma
Subject: Re: [PATCH V4 0/5] Add LE hash collision bug fix for active and passive offloaded connections
From: Vipul Pandya <vipul () chelsio ! com>
Date: 2012-12-18 16:19:09
Message-ID: 50D094AD.8040404 () chelsio ! com
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Hi Roland and David,
Any feedback on this?
Thanks,
Vipul
On 10-12-2012 15:00, Vipul Pandya wrote:
> This patch series fixes the LE hash collision issue in cxgb4 and RDMA/cxgb4
> drivers in kernel.org.
>
> If the hash functionality is enabled in T4 then tuple information of active and
> passive offloaded connections are stored in DDR3 memory. LE (Lookup Engine)
> implements the interface to search this tuple entries using hash algorithm. To
> avoid LE hash collision, firmware provides new mechanisms to setup active and
> passive open connections.
>
> In case of active open connection, firmware detects LE hash collision situation
> and notifies driver. Driver uses fw_ofld_connection work request to offload
> that connection. Its tuple information will be stored in TCAM memory array.
>
> In case of passive open connection, server filter region is created in TCAM.
> This region stores the filter which will redirect the incoming SYN packet to
> offload queues. After this driver tries to establish the connection using
> firmware work request.
>
> This patch series also adds framework for managing filters and to use T4's
> filter capabilities.
>
> Following testing has been carried out successfully on this patch series.
> 1. 1000 active open connections created and saw that tcam_full counter is
> getting incremented through debugfs file.
> 2. Multiple passive open connections were created and ran the same test
> repetatively to verify server filter is getting created and deleted properly.
>
> The patch-series is based on Roland's infiniband tree (for-next branch),
> and involves changes on cxgb4 and RDMA/cxgb4 drivers. Both linux-rdma and netdev
> are included in this post for review.
>
> We have some more bug fixes in RDMA/cxgb4 after this patch series. So, we would
> like to request this series to get mereged through Roland's infiniband for-next
> tree.
>
> V2: Changed commenting style from kernel-doc format('/**') to normal
> V3: Resending the whole patch series again with the missing patches in V2
> V4: Changed comments for networking from '/*' to '/* Comment' format.
>
> Thanks,
> Vipul Pandya
>
> Vipul Pandya (5):
> cxgb4: Add T4 filter support
> cxgb4: Add LE hash collision bug fix path in LLD driver
> RDMA/cxgb4: Fix LE hash collision bug for active open connection
> RDMA/cxgb4: Fix LE hash collision bug for passive open connection
> RDMA/cxgb4: Fix bug for active and passive LE hash collision path
>
> drivers/infiniband/hw/cxgb4/cm.c | 789 +++++++++++++++++++---
> drivers/infiniband/hw/cxgb4/device.c | 210 ++++++-
> drivers/infiniband/hw/cxgb4/iw_cxgb4.h | 33 +
> drivers/net/ethernet/chelsio/cxgb4/cxgb4.h | 146 +++++
> drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 473 +++++++++++++-
> drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h | 23 +-
> drivers/net/ethernet/chelsio/cxgb4/l2t.c | 34 +
> drivers/net/ethernet/chelsio/cxgb4/l2t.h | 3 +
> drivers/net/ethernet/chelsio/cxgb4/t4_hw.c | 23 +-
> drivers/net/ethernet/chelsio/cxgb4/t4_msg.h | 66 ++
> drivers/net/ethernet/chelsio/cxgb4/t4_regs.h | 37 ++
> drivers/net/ethernet/chelsio/cxgb4/t4fw_api.h | 388 +++++++++++
> 12 files changed, 2100 insertions(+), 125 deletions(-)
>
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