| Message ID | 20220127154009.623304-2-alexandr.lobakin@intel.com |
|---|---|
| State | Changes Requested |
| Delegated to: | Anthony Nguyen |
| 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: Thursday, January 27, 2022 9:10 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>; David S. Miller <davem@davemloft.net> >Subject: [Intel-wired-lan] [PATCH v2 net-next 1/4] 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> >--- > 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 d98aa35c0337..7f7e929e73a8 100644 --- a/drivers/net/ethernet/intel/ice/ice_switch.c +++ b/drivers/net/ethernet/intel/ice/ice_switch.c @@ -5267,12 +5267,12 @@ 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); @@ -5521,11 +5521,10 @@ 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 7b42c51a3eb0..950a66e86227 100644 --- a/drivers/net/ethernet/intel/ice/ice_switch.h +++ b/drivers/net/ethernet/intel/ice/ice_switch.h @@ -129,8 +129,16 @@ 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 {
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> --- 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(-)