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Subject[PATCH v4 net-next 0/5] ice: switch: debloat packet templates code
Date
This hunts down several places around packet templates/dummies for
switch rules which are either repetitive, fragile or just not
really readable code.
It's a common need to add new packet templates and to review such
changes as well, try to simplify both with the help of a pair
macros and aliases.
ice_find_dummy_packet() became very complex at this point with tons
of nested if-elses. It clearly showed this approach does not scale,
so convert its logics to the simple mask-match + static const array.

bloat-o-meter is happy about that (built w/ LLVM 13):

add/remove: 0/1 grow/shrink: 1/1 up/down: 2/-1058 (-1056)
Function old new delta
ice_fill_adv_dummy_packet 289 291 +2
ice_adv_add_update_vsi_list 201 - -201
ice_add_adv_rule 2950 2093 -857
Total: Before=414512, After=413456, chg -0.25%
add/remove: 53/52 grow/shrink: 0/0 up/down: 4660/-3988 (672)
RO Data old new delta
ice_dummy_pkt_profiles - 672 +672
Total: Before=37895, After=38567, chg +1.77%

Diffstat also looks nice, and adding new packet templates now takes
less lines.

We'll probably come out with dynamic template crafting in a while,
but for now let's improve what we have currently.

From v3[0]:
- change u64:48 + u64:16 -> u32 + u16 to fix issues on 32-bit
platforms (and make object code a bit simpler);
- mention ice_find_dummy_packet() conversion in the cover letter.

From v2[1]:
- rebase on top of the GTP changes;
- new: convert template search code to a rodata array (-1000 bytes
from .text, -400 bytes from ice.ko);
- collect Reviewed-by and Tested-by (Marcin, Michal).

From v1[2]:
- rebase on top of the latest next-queue (to fix #3 not applying);
- adjust the kdoc accordingly to the function proto changes in #3;
- no functional changes.

[0] https://lore.kernel.org/netdev/20220318161713.680436-1-alexandr.lobakin@intel.com
[1] https://lore.kernel.org/netdev/20220127154009.623304-1-alexandr.lobakin@intel.com
[2] https://lore.kernel.org/netdev/20220124173116.739083-1-alexandr.lobakin@intel.com

Alexander Lobakin (5):
ice: switch: add and use u16[] aliases to ice_adv_lkup_elem::{h,m}_u
ice: switch: unobscurify bitops loop in ice_fill_adv_dummy_packet()
ice: switch: use a struct to pass packet template params
ice: switch: use convenience macros to declare dummy pkt templates
ice: switch: convert packet template match code to rodata

drivers/net/ethernet/intel/ice/ice_switch.c | 489 ++++++++------------
drivers/net/ethernet/intel/ice/ice_switch.h | 12 +-
2 files changed, 211 insertions(+), 290 deletions(-)

--
2.35.1

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