Hi, > -----Original Message----- > From: Rongwei Liu <rongw...@nvidia.com> > Sent: Monday, June 12, 2023 11:04 AM > To: dev@dpdk.org; Matan Azrad <ma...@nvidia.com>; Slava Ovsiienko > <viachesl...@nvidia.com>; Ori Kam <or...@nvidia.com>; Suanming Mou > <suanmi...@nvidia.com>; NBU-Contact-Thomas Monjalon (EXTERNAL) > <tho...@monjalon.net> > Subject: [PATCH v1] net/mlx5: adapt parse graph header length limitation > > Firmware exports the parse graph header length capability via hca_attr and the > current value is 6. > The user must specify the header length field via field_size. > Field size implies the mask implicitly as 2^field_size-1 > > 1. If field_size is bigger than 6, PMD needs to add an extra offset > internally, let > HW only parses the 6 LSBs as length. > length > |--------|--------|--------|--------| > The actual header length offset 8 doesn't work well with new firmware, only > the bits 8-13 are read and parsed as a length field. > Need to change the offset to 10 (8 + 2) internally. Field mask can't be bigger > than 0x3F (2^6-1). > > 2. If filed_size is smaller that 6, PMD needs to subtract an offset to fit 6 > bits > exactly. > length > |--------|----|------------|--------| > The actual header length offset 8 doesn't work well with new firmware > because firmware will read two more bits from the next field. > Need to change the offset to 6 (8 -2) internally. > > Signed-off-by: Rongwei Liu <rongw...@nvidia.com> > Acked-by: Viacheslav Ovsiienko <viachesl...@nvidia.com>
Patch applied to next-net-mlx, Kindest regards, Raslan Darawsheh
