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| author | Mark A. Greer <mgreer@animalcreek.com> | 2014-09-24 01:38:12 +0200 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2014-11-28 12:39:47 +0100 |
| commit | 49dbb14e30c3249f98fe243c3e21b91d10c5c59b (patch) | |
| tree | 1d98889745d1c4d6ebf9150ef68a47dc762a693b /include/net/nfc | |
| parent | NFC: digital: Add NFC-DEP Initiator-side NACK Support (diff) | |
| download | linux-49dbb14e30c3249f98fe243c3e21b91d10c5c59b.tar.xz linux-49dbb14e30c3249f98fe243c3e21b91d10c5c59b.zip | |
NFC: digital: Add NFC-DEP Target-side NACK Support
When an NFC-DEP Target receives a NACK PDU with
a PNI equal to 1 less than the current PNI, it
is supposed to re-send the last PDU. This is
implied in section 14.12.5.4 of the NFC Digital
Protocol Spec.
The digital layer's NFC-DEP code doesn't implement
Target-side NACK handing so add it. The last PDU
that was sent is saved in the 'nfc_digital_dev'
structure's 'saved_skb' member. The skb will have
an additional reference taken to ensure that the skb
isn't freed when the driver performs a kfree_skb()
on the skb. The length of the skb/PDU is also saved
so the length can be restored when re-sending the PDU
in the skb (the driver will perform an skb_pull() so
an skb_push() needs to be done to restore the skb's
data pointer/length).
Reviewed-by: Thierry Escande <thierry.escande@linux.intel.com>
Tested-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'include/net/nfc')
| -rw-r--r-- | include/net/nfc/digital.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/net/nfc/digital.h b/include/net/nfc/digital.h index 2fd498cdb818..7400a8126cd1 100644 --- a/include/net/nfc/digital.h +++ b/include/net/nfc/digital.h @@ -235,6 +235,9 @@ struct nfc_digital_dev { int nack_count; + struct sk_buff *saved_skb; + unsigned int saved_skb_len; + u16 target_fsc; int (*skb_check_crc)(struct sk_buff *skb); |