I am trying to create an RTE flow rule to match head and non-head fragments to
compute NIC RSS based on 5tuple/3tuple respectively on connectX-6 DX NIC and
mlx5 driver.
As part of it when trying to install RTE flow rule using testpmd on dpdk
21.11/23.07 version, the following errors are thrown.
Flow rule to match head fragment
=================================
testpmd> flow create 0 ingress pattern eth / ipv4 fragment_offset spec 0x2000
fragment_offset mask 0x3fff / end actions drop / count / end
port_flow_complain(): Caught PMD error type 13 (specific pattern item): cause:
0x7ffd1954c548, match on first fragment not supported: Operation not supported
Flow rule to match non-head fragments
======================================
testpmd> flow validate 0 ingress pattern eth / ipv4 fragment_offset is 0x2001
fragment_offset last 0x1fff / end actions drop / end
port_flow_complain(): Caught PMD error type 11 (item specification range):
cause: 0x7ffc6f629534, specified range not supported: Operation not supported
When I browsed mlx5_flow_dv.c driver file, there are set of conditions
implemented to block this configurations.
Could you kindly help is there a way to compute different RSS hash for
fragments and non-fragments using RTE flow rules on mellanox?
Thanks! in advance.
/*
* Match on fragment_offset 0x2000 means MF is 1 and frag-offset is 0,
* indicating this is 1st fragment of fragmented packet.
* This is not yet supported in MLX5, return appropriate error message.
*/
if (fragment_offset_spec == RTE_BE16(RTE_IPV4_HDR_MF_FLAG))
return rte_flow_error_set(error, ENOTSUP,
RTE_FLOW_ERROR_TYPE_ITEM, item,
"match on first fragment not "
"supported");
if (fragment_offset_spec && !last)
return rte_flow_error_set(error, ENOTSUP,
RTE_FLOW_ERROR_TYPE_ITEM, item,
"specified value not supported");
/*
* Match on fragment_offset spec 0x2001 and last 0x3fff
* means MF is 1 and frag-offset is > 0.
* This packet is fragment 2nd and onward, excluding last.
* This is not yet supported in MLX5, return appropriate
* error message.
*/
if (fragment_offset_spec == RTE_BE16(RTE_IPV4_HDR_MF_FLAG + 1) &&
fragment_offset_last == RTE_BE16(MLX5_IPV4_FRAG_OFFSET_MASK))
return rte_flow_error_set(error, ENOTSUP,
RTE_FLOW_ERROR_TYPE_ITEM_LAST,
last, "match on following "
"fragments not supported");
/*
* Match on fragment_offset spec 0x0001 and last 0x1fff
* means MF is 0 and frag-offset is > 0.
* This packet is last fragment of fragmented packet.
* This is not yet supported in MLX5, return appropriate
* error message.
*/
if (fragment_offset_spec == RTE_BE16(1) &&
fragment_offset_last == RTE_BE16(RTE_IPV4_HDR_OFFSET_MASK))
return rte_flow_error_set(error, ENOTSUP,
RTE_FLOW_ERROR_TYPE_ITEM_LAST,
last, "match on last "
"fragment not supported");