From 3b282bc6095f77908cb83427d93f0764e8419fdb Mon Sep 17 00:00:00 2001 From: Vladimir Kondratiev Date: Sun, 4 Oct 2015 10:23:19 +0300 Subject: wil6210: Add proper handling for invalid frames on Rx On Rx, when invalid frame is received and dropped, reaping of next frames from Rx ring is stopped. This stops NAPI polling and re-enables the Rx interrupt. However, in cases where no more frames received, interrupt will not be triggered and rest of Rx frames will not be processed. Skip bad frames and continue to reap Rx packets when such frames are encountered, and add statistics for such frames for debug. Signed-off-by: Hamad Kadmany Signed-off-by: Vladimir Kondratiev Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/wil6210/txrx.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) (limited to 'drivers/net/wireless/ath/wil6210/txrx.c') diff --git a/drivers/net/wireless/ath/wil6210/txrx.c b/drivers/net/wireless/ath/wil6210/txrx.c index 6229110d558a..8ba271f685f4 100644 --- a/drivers/net/wireless/ath/wil6210/txrx.c +++ b/drivers/net/wireless/ath/wil6210/txrx.c @@ -379,14 +379,16 @@ static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil, u16 dmalen; u8 ftype; int cid; - int i = (int)vring->swhead; + int i; struct wil_net_stats *stats; BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb)); +again: if (unlikely(wil_vring_is_empty(vring))) return NULL; + i = (int)vring->swhead; _d = &vring->va[i].rx; if (unlikely(!(_d->dma.status & RX_DMA_STATUS_DU))) { /* it is not error, we just reached end of Rx done area */ @@ -398,7 +400,7 @@ static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil, wil_vring_advance_head(vring, 1); if (!skb) { wil_err(wil, "No Rx skb at [%d]\n", i); - return NULL; + goto again; } d = wil_skb_rxdesc(skb); *d = *_d; @@ -412,10 +414,14 @@ static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil, wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4, (const void *)d, sizeof(*d), false); + cid = wil_rxdesc_cid(d); + stats = &wil->sta[cid].stats; + if (unlikely(dmalen > sz)) { wil_err(wil, "Rx size too large: %d bytes!\n", dmalen); + stats->rx_large_frame++; kfree_skb(skb); - return NULL; + goto again; } skb_trim(skb, dmalen); @@ -424,8 +430,6 @@ static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil, wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1, skb->data, skb_headlen(skb), false); - cid = wil_rxdesc_cid(d); - stats = &wil->sta[cid].stats; stats->last_mcs_rx = wil_rxdesc_mcs(d); if (stats->last_mcs_rx < ARRAY_SIZE(stats->rx_per_mcs)) stats->rx_per_mcs[stats->last_mcs_rx]++; @@ -446,15 +450,17 @@ static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil, if (unlikely(ftype != IEEE80211_FTYPE_DATA)) { wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype); /* TODO: process it */ + stats->rx_non_data_frame++; kfree_skb(skb); - return NULL; + goto again; } if (unlikely(skb->len < ETH_HLEN + snaplen)) { wil_err(wil, "Short frame, len = %d\n", skb->len); /* TODO: process it (i.e. BAR) */ + stats->rx_short_frame++; kfree_skb(skb); - return NULL; + goto again; } /* L4 IDENT is on when HW calculated checksum, check status -- cgit v1.2.3