[PATCH v2] ethdev: add calculate hash function

[Ferruh Yigit]

On 10/10/2023 3:24 PM, Ori Kam wrote:
> rte_flow supports insert by index table[1].
> 
> Using the above table, the application can create rules
> that are based on hash.
> For example application can create the following logic in order
> to create load balancing:
> 1. Create insert by index table with 2 rules, that hashes based on dmac
> 2. Insert to index 0 a rule that sends the traffic to port A.
> 3. Insert to index 1 a rule that sends the traffic to port B.
> 
> Let's also assume that before this table, there is a 5 tuple
> match table that jumps to the above table.
> 
> So each packet that matches one of the 5 tuple rules is RSSed
> to port A or B, based on dmac hash.
> 
> The issue arises when there is a miss on the 5 tuple table,
> which resulted due to the packet being the first packet of this flow, or
> fragmented packet or any other reason.
> In this case, the application must calculate what would be the
> hash calculated by the HW so it can send the packet to the correct
> port.
> 
> This new API allows applications to calculate the hash value of a given
> packet for a given table.
> 
> [1] - http://patches.dpdk.org/project/dpdk/patch/20230208030624.78465-2-akozyrev@nvidia.com/
> 
> Signed-off-by: Ori Kam <orika at nvidia.com>
> 

Applied to dpdk-next-net/main, thanks.