[RFC PATCH 2/3] nvmet: rdma: utilize ib_device capability for setting max_queue_size

[Guixin Liu]

在 2023/12/18 19:57, Sagi Grimberg 写道:
>
>> Respond with the smaller value between 1024 and the ib_device's
>> max_qp_wr as the RDMA max queue size.
>>
>> Signed-off-by: Guixin Liu <kanie at linux.alibaba.com>
>> ---
>>   drivers/nvme/target/rdma.c | 7 ++++++-
>>   include/linux/nvme-rdma.h  | 2 ++
>>   2 files changed, 8 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c
>> index 8a728c5..c3884dd 100644
>> --- a/drivers/nvme/target/rdma.c
>> +++ b/drivers/nvme/target/rdma.c
>> @@ -2002,7 +2002,12 @@ static u8 nvmet_rdma_get_mdts(const struct 
>> nvmet_ctrl *ctrl)
>>     static u16 nvmet_rdma_get_max_queue_size(const struct nvmet_sq 
>> *nvmet_sq)
>>   {
>> -    return NVME_RDMA_MAX_QUEUE_SIZE;
>> +    struct nvmet_rdma_queue *queue =
>> +        container_of(nvmet_sq, struct nvmet_rdma_queue, nvme_sq);
>> +    int max_qp_wr = queue->dev->device->attrs.max_qp_wr;
>> +
>> +    return (u16)min_t(int, NVMET_QUEUE_SIZE,
>> +              max_qp_wr / (NVME_RDMA_SEND_WR_FACTOR + 1));
>>   }
>
> Should be folded to prev patch
OK, I will do it.
>
>>     static const struct nvmet_fabrics_ops nvmet_rdma_ops = {
>> diff --git a/include/linux/nvme-rdma.h b/include/linux/nvme-rdma.h
>> index 4dd7e6f..c19858b 100644
>> --- a/include/linux/nvme-rdma.h
>> +++ b/include/linux/nvme-rdma.h
>> @@ -8,6 +8,8 @@
>>     #define NVME_RDMA_MAX_QUEUE_SIZE    128
>>   +#define NVME_RDMA_SEND_WR_FACTOR 3  /* MR, SEND, INV */
>> +
>>   enum nvme_rdma_cm_fmt {
>>       NVME_RDMA_CM_FMT_1_0 = 0x0,
>>   };