diff options
| author | Emmanuel Grumbach <emmanuel.grumbach@intel.com> | 2015-10-18 09:31:24 +0300 |
|---|---|---|
| committer | Emmanuel Grumbach <emmanuel.grumbach@intel.com> | 2015-12-20 23:27:37 +0200 |
| commit | 6eb5e529d7e3bf85b50ab0b5178df905dfc53b06 (patch) | |
| tree | 23891c1b8c886b4f2c5302166ec3d34f5173111f /drivers/net/wireless/intel/iwlwifi/iwl-trans.h | |
| parent | 3f73b8cad1d2923bf27caeaba705c4a64b287f1e (diff) | |
iwlwifi: pcie: build an A-MSDU using TSO core
When the op_mode sends an skb whose payload is bigger than
MSS, PCIe will create an A-MSDU out of it. PCIe assumes
that the skb that is coming from the op_mode can fit in one
A-MSDU. It is the op_mode's responsibility to make sure
that this guarantee holds.
Additional headers need to be built for the subframes.
The TSO core code takes care of the IP / TCP headers and
the driver takes care of the 802.11 subframe headers.
These headers are stored on a per-cpu page that is re-used
for all the packets handled on that same CPU. Each skb
holds a reference to that page and releases the page when
it is reclaimed. When the page gets full, it is released
and a new one is allocated.
Since any SKB that doesn't go through the fast-xmit path
of mac80211 will be segmented, we can assume here that the
packet is not WEP / TKIP and has a proper SNAP header.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Diffstat (limited to 'drivers/net/wireless/intel/iwlwifi/iwl-trans.h')
| -rw-r--r-- | drivers/net/wireless/intel/iwlwifi/iwl-trans.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-trans.h b/drivers/net/wireless/intel/iwlwifi/iwl-trans.h index a2683ef2068c..43a48746d731 100644 --- a/drivers/net/wireless/intel/iwlwifi/iwl-trans.h +++ b/drivers/net/wireless/intel/iwlwifi/iwl-trans.h @@ -381,6 +381,11 @@ static inline void iwl_free_rxb(struct iwl_rx_cmd_buffer *r) #define MAX_NO_RECLAIM_CMDS 6 +/* + * The first entry in driver_data array in ieee80211_tx_info + * that can be used by the transport. + */ +#define IWL_TRANS_FIRST_DRIVER_DATA 2 #define IWL_MASK(lo, hi) ((1 << (hi)) | ((1 << (hi)) - (1 << (lo)))) /* @@ -553,7 +558,10 @@ struct iwl_trans_txq_scd_cfg { * return -ERFKILL straight away. * May sleep only if CMD_ASYNC is not set * @tx: send an skb. The transport relies on the op_mode to zero the - * the ieee80211_tx_info->driver_data. + * the ieee80211_tx_info->driver_data. If the MPDU is an A-MSDU, all + * the CSUM will be taken care of (TCP CSUM and IP header in case of + * IPv4). If the MPDU is a single MSDU, the op_mode must compute the IP + * header if it is IPv4. * Must be atomic * @reclaim: free packet until ssn. Returns a list of freed packets. * Must be atomic |