[PATCH 7/7] wil6210: fall back to pseudo-DMS mcast for secure link and PBSS

Vladimir Kondratiev
2015-03-15T14:01:00Z

Multicast is not yet properly supported for all connection types;
actually, only non-secure AP is supported. For all other cases,
fall back to old "pseudo-DMS" approach. Namely, for:
- PBSS
- secure connection

When re-routing MCAST Rx->Tx on the AP, do not Tx back to the origin
of the frame

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
---
drivers/net/wireless/ath/wil6210/txrx.c | 103 +++++++++++++++++++++++++++++++-
1 file changed, 101 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/wil6210/txrx.c b/drivers/net/wireless/ath/wil6210/txrx.c
index 1fe390f..e8bd512 100644
--- a/drivers/net/wireless/ath/wil6210/txrx.c
+++ b/drivers/net/wireless/ath/wil6210/txrx.c
@@ -908,8 +908,20 @@ static struct vring *wil_find_tx_vring_sta(struct wil6210_priv *wil,
return NULL;
}

-static struct vring *wil_find_tx_bcast(struct wil6210_priv *wil,
- struct sk_buff *skb)
+/* Use one of 2 strategies:
+ *
+ * 1. New (real broadcast):
+ * use dedicated broadcast vring
+ * 2. Old (pseudo-DMS):
+ * Find 1-st vring and return it;
+ * duplicate skb and send it to other active vrings;
+ * in all cases override dest address to unicast peer's address
+ * Use old strategy when new is not supported yet:
+ * - for PBSS
+ * - for secure link
+ */
+static struct vring *wil_find_tx_bcast_1(struct wil6210_priv *wil,
+ struct sk_buff *skb)
{
struct vring *v;
int i = wil->bcast_vring;
@@ -923,6 +935,93 @@ static struct vring *wil_find_tx_bcast(struct wil6210_priv *wil,
return v;
}

+static void wil_set_da_for_vring(struct wil6210_priv *wil,
+ struct sk_buff *skb, int vring_index)
+{
+ struct ethhdr *eth = (void *)skb->data;
+ int cid = wil->vring2cid_tid[vring_index][0];
+
+ ether_addr_copy(eth->h_dest, wil->sta[cid].addr);
+}
+
+static struct vring *wil_find_tx_bcast_2(struct wil6210_priv *wil,
+ struct sk_buff *skb)
+{
+ struct vring *v, *v2;
+ struct sk_buff *skb2;
+ int i;
+ u8 cid;
+ struct ethhdr *eth = (void *)skb->data;
+ char *src = eth->h_source;
+
+ /* find 1-st vring eligible for data */
+ for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
+ v = &wil->vring_tx[i];
+ if (!v->va)
+ continue;
+
+ cid = wil->vring2cid_tid[i][0];
+ if (cid >= WIL6210_MAX_CID) /* skip BCAST */
+ continue;
+ if (!wil->sta[cid].data_port_open)
+ continue;
+
+ /* don't Tx back to source when re-routing Rx->Tx at the AP */
+ if (0 == memcmp(wil->sta[cid].addr, src, ETH_ALEN))
+ continue;
+
+ goto found;
+ }
+
+ wil_dbg_txrx(wil, "Tx while no vrings active?\n");
+
+ return NULL;
+
+found:
+ wil_dbg_txrx(wil, "BCAST -> ring %d\n", i);
+ wil_set_da_for_vring(wil, skb, i);
+
+ /* find other active vrings and duplicate skb for each */
+ for (i++; i < WIL6210_MAX_TX_RINGS; i++) {
+ v2 = &wil->vring_tx[i];
+ if (!v2->va)
+ continue;
+ cid = wil->vring2cid_tid[i][0];
+ if (cid >= WIL6210_MAX_CID) /* skip BCAST */
+ continue;
+ if (!wil->sta[cid].data_port_open)
+ continue;
+
+ if (0 == memcmp(wil->sta[cid].addr, src, ETH_ALEN))
+ continue;
+
+ skb2 = skb_copy(skb, GFP_ATOMIC);
+ if (skb2) {
+ wil_dbg_txrx(wil, "BCAST DUP -> ring %d\n", i);
+ wil_set_da_for_vring(wil, skb2, i);
+ wil_tx_vring(wil, v2, skb2);
+ } else {
+ wil_err(wil, "skb_copy failed\n");
+ }
+ }
+
+ return v;
+}
+
+static struct vring *wil_find_tx_bcast(struct wil6210_priv *wil,
+ struct sk_buff *skb)
+{
+ struct wireless_dev *wdev = wil->wdev;
+
+ if (wdev->iftype != NL80211_IFTYPE_AP)
+ return wil_find_tx_bcast_2(wil, skb);
+
+ if (wil->privacy)
+ return wil_find_tx_bcast_2(wil, skb);
+
+ return wil_find_tx_bcast_1(wil, skb);
+}
+
static int wil_tx_desc_map(struct vring_tx_desc *d, dma_addr_t pa, u32 len,
int vring_index)
{
--
2.1.0