netdev - Re: [PATCH v4 iproute2 2/7] rdma: Add dev object

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Date:   Tue, 15 Aug 2017 19:43:50 +0300
From:   Leon Romanovsky <leonro@...lanox.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Ariel Almog <ariela@...lanox.com>,
        Linux Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v4 iproute2 2/7] rdma: Add dev object

On Tue, Aug 15, 2017 at 09:12:05AM -0700, Stephen Hemminger wrote:
> On Tue, 15 Aug 2017 16:00:15 +0300
> Leon Romanovsky <leonro@...lanox.com> wrote:
>
> > +
> > +static const char *dev_caps_to_str(uint32_t idx)
> > +{
> > +	uint64_t cap = 1 << idx;
> > +
> > +	switch (cap) {
> > +	case RDMA_DEV_RESIZE_MAX_WR: return "RESIZE_MAX_WR";
> > +	case RDMA_DEV_BAD_PKEY_CNTR: return "BAD_PKEY_CNTR";
> > +	case RDMA_DEV_BAD_QKEY_CNTR: return "BAD_QKEY_CNTR";
> > +	case RDMA_DEV_RAW_MULTI: return "RAW_MULTI";
> > +	case RDMA_DEV_AUTO_PATH_MIG: return "AUTO_PATH_MIG";
> > +	case RDMA_DEV_CHANGE_PHY_PORT: return "CHANGE_PHY_POR";
> > +	case RDMA_DEV_UD_AV_PORT_ENFORCE: return "UD_AV_PORT_ENFORCE";
> > +	case RDMA_DEV_CURR_QP_STATE_MOD: return "CURR_QP_STATE_MOD";
> > +	case RDMA_DEV_SHUTDOWN_PORT: return "SHUTDOWN_PORT";
> > +	case RDMA_DEV_INIT_TYPE: return "INIT_TYPE";
> > +	case RDMA_DEV_PORT_ACTIVE_EVENT: return "PORT_ACTIVE_EVENT";
> > +	case RDMA_DEV_SYS_IMAGE_GUID: return "SYS_IMAGE_GUID";
> > +	case RDMA_DEV_RC_RNR_NAK_GEN: return "RC_RNR_NAK_GEN";
> > +	case RDMA_DEV_SRQ_RESIZE: return "SRQ_RESIZE";
> > +	case RDMA_DEV_N_NOTIFY_CQ: return "N_NOTIFY_CQ";
> > +	case RDMA_DEV_LOCAL_DMA_LKEY: return "LOCAL_DMA_LKEY";
> > +	case RDMA_DEV_MEM_WINDOW: return "MEM_WINDOW";
> > +	case RDMA_DEV_UD_IP_CSUM: return "UD_IP_CSUM";
> > +	case RDMA_DEV_UD_TSO: return "UD_TSO";
> > +	case RDMA_DEV_XRC: return "XRC";
> > +	case RDMA_DEV_MEM_MGT_EXTENSIONS: return "MEM_MGT_EXTENSIONS";
> > +	case RDMA_DEV_BLOCK_MULTICAST_LOOPBACK:
> > +					return "BLOCK_MULTICAST_LOOPBACK";
> > +	case RDMA_DEV_MEM_WINDOW_TYPE_2A: return "MEM_WINDOW_TYPE_2A";
> > +	case RDMA_DEV_MEM_WINDOW_TYPE_2B: return "MEM_WINDOW_TYPE_2B";
> > +	case RDMA_DEV_RC_IP_CSUM: return "RC_IP_CSUM";
> > +	case RDMA_DEV_RAW_IP_CSUM: return "RAW_IP_CSUM";
> > +	case RDMA_DEV_CROSS_CHANNEL: return "CROSS_CHANNEL";
> > +	case RDMA_DEV_MANAGED_FLOW_STEERING: return "MANAGED_FLOW_STEERING";
> > +	case RDMA_DEV_SIGNATURE_HANDOVER: return "SIGNATURE_HANDOVER";
> > +	case RDMA_DEV_ON_DEMAND_PAGING: return "ON_DEMAND_PAGING";
> > +	case RDMA_DEV_SG_GAPS_REG: return "SG_GAPS_REG";
> > +	case RDMA_DEV_VIRTUAL_FUNCTION: return "VIRTUAL_FUNCTION";
> > +	case RDMA_DEV_RAW_SCATTER_FCS: return "RAW_SCATTER_FCS";
> > +	case RDMA_DEV_RDMA_NETDEV_OPA_VNIC: return "RDMA_NETDEV_OPA_VNIC";
> > +	default: return "UNKNOWN";
> > +	}
>
> Could this be a table in future versions?

The device capability is 64 bit field -> the table will have 64 entry,
while most of them should be marked as "UNKNOWN". Because we have holes
[1] in the fields (for example bit 9), I can't use simple
"if (idx > max_value) return "uknown"" logic.

So the answer is yes, I can do it as a table, but it won't look better than
it is now :)

By writing "future versions", are you asking me to resubmit? or followup patch
will be possible solution too?

Thanks

[1] http://marc.info/?l=linux-rdma&m=150278850520856&w=2

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