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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Xiaoyu Min <jackmin@mellanox.com>,
	Jingjing Wu <jingjing.wu@intel.com>,
	Beilei Xing <beilei.xing@intel.com>
Cc: dev@dpdk.org, Xiaoyu Min <jackmin@nvidia.com>,
	Thomas Monjalon <thomas@monjalon.net>,
	Andrew Rybchenko <arybchenko@solarflare.com>,
	Ori Kam <orika@nvidia.com>, Dekel Peled <dekelp@nvidia.com>
Subject: Re: [dpdk-dev] [PATCH 4/5] net/iavf: fix protocol size for virtchnl copy
Date: Mon, 16 Nov 2020 16:23:18 +0000
Message-ID: <8990f612-b3b1-bdbc-8da3-9a0e45d5c3bc@intel.com> (raw)
In-Reply-To: <bb7e08aab2a777b6ceef6e39ccec415b26f12267.1605493464.git.jackmin@nvidia.com>

On 11/16/2020 7:55 AM, Xiaoyu Min wrote:
> From: Xiaoyu Min <jackmin@nvidia.com>
> 
> The rte_flow_item_vlan items are refined.
> The structs do not exactly represent the packet bits captured on the
> wire anymore so should only copy real header instead of the whole struct.
> 
> Replace the rte_flow_item_* with the existing corresponding rte_*_hdr.
> 
> Fixes: 09315fc83861 ("ethdev: add VLAN attributes to ethernet and VLAN items")
> 
> Signed-off-by: Xiaoyu Min <jackmin@nvidia.com>
> ---
>   drivers/net/iavf/iavf_fdir.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/iavf/iavf_fdir.c b/drivers/net/iavf/iavf_fdir.c
> index d683a468c1..7054bde0b9 100644
> --- a/drivers/net/iavf/iavf_fdir.c
> +++ b/drivers/net/iavf/iavf_fdir.c
> @@ -541,7 +541,7 @@ iavf_fdir_parse_pattern(__rte_unused struct iavf_adapter *ad,
>   				VIRTCHNL_ADD_PROTO_HDR_FIELD_BIT(hdr, ETH, ETHERTYPE);
>   
>   				rte_memcpy(hdr->buffer,
> -					eth_spec, sizeof(*eth_spec));
> +					eth_spec, sizeof(struct rte_ether_hdr));

This requires 'struct rte_flow_item_eth' should have 'struct rte_ether_hdr' as 
first element, and I suspect this usage exists in a few more locations, but I 
wonder if this assumption is real and documented in somewhere?
I am not just talking about 'struct rte_flow_item_eth', but for all 
'rte_flow_item_*'...



btw, while checking for the 'struct rte_flow_item_eth', pahole shows it is using 
20 bytes, and I suspect this is not the intention with the reserved field:

struct rte_flow_item_eth {
	struct rte_ether_addr      dst;                  /*     0     6 */
	struct rte_ether_addr      src;                  /*     6     6 */
	uint16_t                   type;                 /*    12     2 */

	/* Bitfield combined with previous fields */

	uint32_t                   has_vlan:1;           /*    12:15  4 */

	/* XXX 31 bits hole, try to pack */

	uint32_t                   reserved:31;          /*    16: 1  4 */

	/* size: 20, cachelines: 1, members: 5 */
	/* bit holes: 1, sum bit holes: 31 bits */
	/* bit_padding: 1 bits */
	/* last cacheline: 20 bytes */
};

'has_vlan' seems combined with previous field to make together 32 bits. So the 
'reserved' field is occupying a new 32 bits all by itself.

What about changing the struct as following, while we can change the ABI:
struct rte_flow_item_eth {
	struct rte_ether_addr      dst;                  /*     0     6 */
	struct rte_ether_addr      src;                  /*     6     6 */
	uint16_t                   type;                 /*    12     2 */
	uint16_t                   has_vlan:1;           /*    14:15  2 */
	uint16_t                   reserved:15;          /*    14: 0  2 */

	/* size: 16, cachelines: 1, members: 5 */
	/* last cacheline: 16 bytes */
};





  reply	other threads:[~2020-11-16 16:23 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-16  7:55 [dpdk-dev] [PATCH 0/5] fix protocol size calculation Xiaoyu Min
2020-11-16  7:55 ` [dpdk-dev] [PATCH 1/5] net/mlx5: fix protocol size for raw encap judgement Xiaoyu Min
2020-11-17 13:25   ` Matan Azrad
2020-11-22 14:21     ` Thomas Monjalon
2020-11-22 15:32   ` Thomas Monjalon
2020-11-22 16:04     ` Matan Azrad
2020-11-23  7:54       ` Ori Kam
2020-11-23  8:12         ` Thomas Monjalon
2020-11-16  7:55 ` [dpdk-dev] [PATCH 2/5] app/flow-perf: fix protocol size for raw encap Xiaoyu Min
2020-11-16  7:55 ` [dpdk-dev] [PATCH 3/5] net/bnxt: fix protocol size for VXLAN encap copy Xiaoyu Min
2020-11-16 16:12   ` Ferruh Yigit
2020-11-18  0:34     ` Ajit Khaparde
2020-11-18  6:37       ` Andrew Rybchenko
2020-11-18 17:44         ` Ajit Khaparde
2020-11-16  7:55 ` [dpdk-dev] [PATCH 4/5] net/iavf: fix protocol size for virtchnl copy Xiaoyu Min
2020-11-16 16:23   ` Ferruh Yigit [this message]
2020-11-22 13:28     ` Jack Min
2020-11-22 14:15       ` Thomas Monjalon
2020-11-23 10:02         ` Ferruh Yigit
2020-11-23 10:49   ` Ferruh Yigit
2020-11-24 21:58     ` Thomas Monjalon
2020-11-27  1:17   ` Xing, Beilei
2020-11-16  7:55 ` [dpdk-dev] [PATCH 5/5] net/softnic: update headers size calculation Xiaoyu Min
2020-11-16 16:27   ` Ferruh Yigit
2020-11-16 19:09     ` Dekel Peled
2020-11-17 10:30       ` Ferruh Yigit
2020-11-17 12:41         ` Dekel Peled
2020-11-17 15:43           ` Singh, Jasvinder
2020-11-18  2:23   ` Zhou, JunX W
2020-11-22 16:11 ` [dpdk-dev] [PATCH 0/5] fix protocol " Thomas Monjalon

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