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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Thomas Monjalon <thomas@monjalon.net>, Ophir Munk <ophirmu@mellanox.com>
Cc: dev@dpdk.org, Pascal Mazon <pascal.mazon@6wind.com>,
	Olga Shern <olgas@mellanox.com>,
	stable@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v1] net/tap: return empty port offload capabilities
Date: Wed, 25 Apr 2018 18:13:52 +0100	[thread overview]
Message-ID: <50c08c3d-d4e0-1169-3627-ed958af27497@intel.com> (raw)
In-Reply-To: <1822119.1fBLbGrzlv@xps>

On 4/25/2018 5:47 PM, Thomas Monjalon wrote:
> 25/04/2018 18:15, Ophir Munk:
>> Fix report on port offload capabilities to be 0 (no capabilities).
>> Before this commit port capabilities were a clone of queue
>> capabilities, however the current TAP offload capabilities (e.g.
>> checksum calculation) are per queue and are not specific per port.
> 
> I did not follow what is the problem exactly.
> But this change looks wrong to me.
> Please look at the thread
> 	"Survey for final decision about per-port offload API"
> 	http://dpdk.org/ml/archives/dev/2018-March/094459.html
> It says:
> 	"every queue capabilities must be reported as port capabilities"

That logic is correct in capability reporting [1].

The problem here is the offload verify function assumes the
tap_rx_offload_get_port_capa() is the only port level offloads. Returning queue
level offloads in this function breaks the verify logic.

I think the reason of this issue is undocumented smart verify function
implementation (copied from mlx5 driver) [2], since it is not easy to understand
it is easy to confuse.


[1]
dev_info->rx_queue_offload_capa = tap_rx_offload_get_queue_capa();
dev_info->rx_offload_capa = tap_rx_offload_get_port_capa() |
                            dev_info->rx_queue_offload_capa;

[2]
static bool
tap_rxq_are_offloads_valid(struct rte_eth_dev *dev, uint64_t offloads)
{
        uint64_t port_offloads = dev->data->dev_conf.rxmode.offloads;
        uint64_t queue_supp_offloads = tap_rx_offload_get_queue_capa();
        uint64_t port_supp_offloads = tap_rx_offload_get_port_capa();

        if ((offloads & (queue_supp_offloads | port_supp_offloads)) !=
            offloads)
                return false;
        if ((port_offloads ^ offloads) & port_supp_offloads)
                return false;
        return true;
}

  reply	other threads:[~2018-04-25 17:13 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-25 16:15 Ophir Munk
2018-04-25 16:31 ` Ferruh Yigit
2018-04-26 11:09   ` Ophir Munk
2018-04-25 16:47 ` Thomas Monjalon
2018-04-25 17:13   ` Ferruh Yigit [this message]
2018-04-26 11:13 ` [dpdk-dev] [PATCH v2] " Ophir Munk
2018-04-26 16:56   ` Ferruh Yigit
2018-04-26 16:57     ` [dpdk-dev] [dpdk-stable] " Ferruh Yigit

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