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Fix missing padding in tx. Makes max-sized packets not get dropped

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This commit is contained in:
Dario Nieuwenhuis 2023-05-08 21:45:54 +02:00
parent a7dee5b65c
commit 881e9d07d2
1 changed files with 15 additions and 4 deletions
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19
src/runner.rs
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@ -249,7 +249,16 @@ where
let mut buf = [0; 512];
let buf8 = slice8_mut(&mut buf);
let total_len = SdpcmHeader::SIZE + BcdHeader::SIZE + packet.len();
// There MUST be 2 bytes of padding between the SDPCM and BCD headers.
// And ONLY for data packets!
// No idea why, but the firmware will append two zero bytes to the tx'd packets
// otherwise. If the packet is exactly 1514 bytes (the max MTU), this makes it
// be oversized and get dropped.
// WHD adds it here https://github.com/Infineon/wifi-host-driver/blob/c04fcbb6b0d049304f376cf483fd7b1b570c8cd5/WiFi_Host_Driver/src/include/whd_sdpcm.h#L90
// and adds it to the header size her https://github.com/Infineon/wifi-host-driver/blob/c04fcbb6b0d049304f376cf483fd7b1b570c8cd5/WiFi_Host_Driver/src/whd_sdpcm.c#L597
// ¯\_(ツ)_/¯
const PADDING_SIZE: usize = 2;
let total_len = SdpcmHeader::SIZE + PADDING_SIZE + BcdHeader::SIZE + packet.len();
let seq = self.sdpcm_seq;
self.sdpcm_seq = self.sdpcm_seq.wrapping_add(1);
@ -260,7 +269,7 @@ where
sequence: seq,
channel_and_flags: CHANNEL_TYPE_DATA,
next_length: 0,
header_length: SdpcmHeader::SIZE as _,
header_length: (SdpcmHeader::SIZE + PADDING_SIZE) as _,
wireless_flow_control: 0,
bus_data_credit: 0,
reserved: [0, 0],
@ -276,8 +285,10 @@ where
trace!(" {:?}", bcd_header);
buf8[0..SdpcmHeader::SIZE].copy_from_slice(&sdpcm_header.to_bytes());
buf8[SdpcmHeader::SIZE..][..BcdHeader::SIZE].copy_from_slice(&bcd_header.to_bytes());
buf8[SdpcmHeader::SIZE + BcdHeader::SIZE..][..packet.len()].copy_from_slice(packet);
buf8[SdpcmHeader::SIZE + PADDING_SIZE..][..BcdHeader::SIZE]
.copy_from_slice(&bcd_header.to_bytes());
buf8[SdpcmHeader::SIZE + PADDING_SIZE + BcdHeader::SIZE..][..packet.len()]
.copy_from_slice(packet);
let total_len = (total_len + 3) & !3; // round up to 4byte