netdev - Re: [PATCH net-next 2/4] qed: Add iWARP out of order support

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Date:   Wed, 20 Sep 2017 06:03:32 +0000
From:   "Kalderon, Michal" <Michal.Kalderon@...ium.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "dledford@...hat.com" <dledford@...hat.com>,
        "Elior, Ariel" <Ariel.Elior@...ium.com>
Subject: Re: [PATCH net-next 2/4] qed: Add iWARP out of order support

From: Leon Romanovsky <leon@...nel.org>
Sent: Tuesday, September 19, 2017 8:45 PM
On Tue, Sep 19, 2017 at 08:26:17PM +0300, Michal Kalderon wrote:
>> iWARP requires OOO support which is already provided by the ll2
>> interface (until now was used only for iSCSI offload).
>> The changes mostly include opening a ll2 dedicated connection for
>> OOO and notifiying the FW about the handle id.
>>
>> Signed-off-by: Michal Kalderon <Michal.Kalderon@...ium.com>
>> Signed-off-by: Ariel Elior <Ariel.Elior@...ium.com>
>> ---
>>  drivers/net/ethernet/qlogic/qed/qed_iwarp.c | 44 +++++++++++++++++++++++++++++
>>  drivers/net/ethernet/qlogic/qed/qed_iwarp.h | 11 +++++++-
>>  drivers/net/ethernet/qlogic/qed/qed_rdma.c  |  7 +++--
>>  3 files changed, 59 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/qlogic/qed/qed_iwarp.c b/drivers/net/ethernet/qlogic/qed/qed_iwarp.c
>> index 9d989c9..568e985 100644
>> --- a/drivers/net/ethernet/qlogic/qed/qed_iwarp.c
>> +++ b/drivers/net/ethernet/qlogic/qed/qed_iwarp.c
>> @@ -41,6 +41,7 @@
>>  #include "qed_rdma.h"
>>  #include "qed_reg_addr.h"
>>  #include "qed_sp.h"
>> +#include "qed_ooo.h"
>>
>>  #define QED_IWARP_ORD_DEFAULT                32
>>  #define QED_IWARP_IRD_DEFAULT                32
>> @@ -119,6 +120,13 @@ static void qed_iwarp_cid_cleaned(struct qed_hwfn *p_hwfn, u32 cid)
>>       spin_unlock_bh(&p_hwfn->p_rdma_info->lock);
>>  }
>>
>> +void qed_iwarp_init_fw_ramrod(struct qed_hwfn *p_hwfn,
>> +                           struct iwarp_init_func_params *p_ramrod)
>> +{
>> +     p_ramrod->ll2_ooo_q_index = RESC_START(p_hwfn, QED_LL2_QUEUE) +
>> +                                 p_hwfn->p_rdma_info->iwarp.ll2_ooo_handle;
>> +}
>> +
>>  static int qed_iwarp_alloc_cid(struct qed_hwfn *p_hwfn, u32 *cid)
>>  {
>>       int rc;
>> @@ -1876,6 +1884,16 @@ static int qed_iwarp_ll2_stop(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
>>               iwarp_info->ll2_syn_handle = QED_IWARP_HANDLE_INVAL;
>>       }
>>
>> +     if (iwarp_info->ll2_ooo_handle != QED_IWARP_HANDLE_INVAL) {
>> +             rc = qed_ll2_terminate_connection(p_hwfn,
>> +                                               iwarp_info->ll2_ooo_handle);
>> +             if (rc)
>> +                     DP_INFO(p_hwfn, "Failed to terminate ooo connection\n");
>
>What exactly will you do with this knowledge? Anyway you are not
>interested in return values of qed_ll2_terminate_connection function in
>this place and other places too.
>
>Why don't you handle EAGAIN returned from the qed_ll2_terminate_connection()?
>
>Thanks
Thanks for pointing this out, you're right we could have ignored the return code, as there's
not much we can do at this point if it failed. But I still feel failures are worth knowing about,
and could help in analysis if they unexpectedly lead to another issue.
As for EAGAIN, it is very unlikely that we'll get this return code. Will consider adding generic
handling for this as a separate patch, as this currently isn't handled in any of the ll2 flows.
thanks,