| Message ID | 20220321105954.843154-2-alexandr.lobakin@intel.com (mailing list archive) |
|---|---|
| State | Awaiting Upstream |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | ice: switch: debloat packet templates code | expand |
>-----Original Message----- >From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of >Alexander Lobakin >Sent: Monday, March 21, 2022 4:30 PM >To: intel-wired-lan@lists.osuosl.org >Cc: Szapar-Mudlaw, Martyna <martyna.szapar-mudlaw@intel.com>; >netdev@vger.kernel.org; linux-kernel@vger.kernel.org; Jakub Kicinski ><kuba@kernel.org>; Paolo Abeni <pabeni@redhat.com>; David S. Miller ><davem@davemloft.net> >Subject: [Intel-wired-lan] [PATCH v4 net-next 1/5] ice: switch: add and use >u16[] aliases to ice_adv_lkup_elem::{h, m}_u > >ice_adv_lkup_elem fields h_u and m_u are being accessed as raw u16 arrays >in several places. >To reduce cast and braces burden, add permanent array-of-u16 aliases with >the same size as the `union ice_prot_hdr` itself via anonymous unions to the >actual struct declaration, and just access them directly. > >This: > - removes the need to cast the union to u16[] and then dereference > it each time -> reduces the horizon for potential bugs; > - improves -Warray-bounds coverage -- the array size is now known > at compilation time; > - addresses cppcheck complaints. > >Signed-off-by: Alexander Lobakin <alexandr.lobakin@intel.com> >Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com> >Tested-by: Marcin Szycik <marcin.szycik@linux.intel.com> >--- > drivers/net/ethernet/intel/ice/ice_switch.c | 15 +++++++-------- >drivers/net/ethernet/intel/ice/ice_switch.h | 12 ++++++++++-- > 2 files changed, 17 insertions(+), 10 deletions(-) > Tested-by: Sandeep Penigalapati <sandeep.penigalapati@intel.com>
diff --git a/drivers/net/ethernet/intel/ice/ice_switch.c b/drivers/net/ethernet/intel/ice/ice_switch.c index 25b8f6f726eb..075df2474688 100644 --- a/drivers/net/ethernet/intel/ice/ice_switch.c +++ b/drivers/net/ethernet/intel/ice/ice_switch.c @@ -5811,12 +5811,12 @@ ice_fill_adv_dummy_packet(struct ice_adv_lkup_elem *lkups, u16 lkups_cnt, * over any significant packet data. */ for (j = 0; j < len / sizeof(u16); j++) - if (((u16 *)&lkups[i].m_u)[j]) + if (lkups[i].m_raw[j]) ((u16 *)(pkt + offset))[j] = (((u16 *)(pkt + offset))[j] & - ~((u16 *)&lkups[i].m_u)[j]) | - (((u16 *)&lkups[i].h_u)[j] & - ((u16 *)&lkups[i].m_u)[j]); + ~lkups[i].m_raw[j]) | + (lkups[i].h_raw[j] & + lkups[i].m_raw[j]); } s_rule->pdata.lkup_tx_rx.hdr_len = cpu_to_le16(pkt_len); @@ -6065,11 +6065,10 @@ ice_add_adv_rule(struct ice_hw *hw, struct ice_adv_lkup_elem *lkups, /* get # of words we need to match */ word_cnt = 0; for (i = 0; i < lkups_cnt; i++) { - u16 j, *ptr; + u16 j; - ptr = (u16 *)&lkups[i].m_u; - for (j = 0; j < sizeof(lkups->m_u) / sizeof(u16); j++) - if (ptr[j] != 0) + for (j = 0; j < ARRAY_SIZE(lkups->m_raw); j++) + if (lkups[i].m_raw[j]) word_cnt++; } diff --git a/drivers/net/ethernet/intel/ice/ice_switch.h b/drivers/net/ethernet/intel/ice/ice_switch.h index ed3d1d03befa..ecac75e71395 100644 --- a/drivers/net/ethernet/intel/ice/ice_switch.h +++ b/drivers/net/ethernet/intel/ice/ice_switch.h @@ -138,8 +138,16 @@ struct ice_update_recipe_lkup_idx_params { struct ice_adv_lkup_elem { enum ice_protocol_type type; - union ice_prot_hdr h_u; /* Header values */ - union ice_prot_hdr m_u; /* Mask of header values to match */ + union { + union ice_prot_hdr h_u; /* Header values */ + /* Used to iterate over the headers */ + u16 h_raw[sizeof(union ice_prot_hdr) / sizeof(u16)]; + }; + union { + union ice_prot_hdr m_u; /* Mask of header values to match */ + /* Used to iterate over header mask */ + u16 m_raw[sizeof(union ice_prot_hdr) / sizeof(u16)]; + }; }; struct ice_sw_act_ctrl {