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| author | Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com> | 2015-03-15 16:00:19 +0200 |
|---|---|---|
| committer | Kalle Valo <kvalo@codeaurora.org> | 2015-03-20 08:33:19 +0200 |
| commit | c406ea7c7406f00aa1fb6c697d47d070fd222037 (patch) | |
| tree | 6d47a0202ed18a8219011422c81de335be8ff25b /drivers/net/wireless/ath/wil6210/wmi.c | |
| parent | cec94d8cf5c2e5347ed9264cc94210e6376c7a46 (diff) | |
| download | linux-c406ea7c7406f00aa1fb6c697d47d070fd222037.tar.gz linux-c406ea7c7406f00aa1fb6c697d47d070fd222037.tar.bz2 linux-c406ea7c7406f00aa1fb6c697d47d070fd222037.zip | |
wil6210: Align Rx frames on 4*n+2 by having SNAP
For the networking code and for hardware network accelerators,
it is better to have IP header 4*n aligned. On the other side,
DMA on Rx path require buffer to be aligned on 4*n as well.
Having 14 bytes of Ethernet header, these 2 alignment
requests are in contradiction.
To solve this, order hardware offload block to not remove
SNAP header. This adds extra 6 bytes between addresses and
ethertype, making it 20 bytes total. This way, both buffer and
IP header are 4*n aligned. Remaining is only to remove SNAP
by shifting addresses 6 bytes. This involves data copying, so
this feature should be disabled unless required by the platform.
Module parameter "rx_align_2" (bool, default - false)
introduced to control this feature. Feature is completely disabled
when parameter is false.
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Diffstat (limited to 'drivers/net/wireless/ath/wil6210/wmi.c')
| -rw-r--r-- | drivers/net/wireless/ath/wil6210/wmi.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/wil6210/wmi.c b/drivers/net/wireless/ath/wil6210/wmi.c index 021313524913..8c18a46582db 100644 --- a/drivers/net/wireless/ath/wil6210/wmi.c +++ b/drivers/net/wireless/ath/wil6210/wmi.c @@ -1109,6 +1109,11 @@ int wmi_rx_chain_add(struct wil6210_priv *wil, struct vring *vring) */ cmd.l3_l4_ctrl |= (1 << L3_L4_CTRL_TCPIP_CHECKSUM_EN_POS); } + + if (rx_align_2) + cmd.l2_802_3_offload_ctrl |= + L2_802_3_OFFLOAD_CTRL_SNAP_KEEP_MSK; + /* typical time for secure PCP is 840ms */ rc = wmi_call(wil, WMI_CFG_RX_CHAIN_CMDID, &cmd, sizeof(cmd), WMI_CFG_RX_CHAIN_DONE_EVENTID, &evt, sizeof(evt), 2000); |