Rx descriptors stored in non-cacheable memory area for DMA.
Non-cacheable memory causes long access time from CPU.
Copy rx descriptor to the skb->cb, and use this copy.
It provides faster memory access, and will be usefull to keep
Rx information for later processing (BACK reorder)
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@xxxxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/wil6210/txrx.c | 20 ++++++++++++++------
drivers/net/wireless/ath/wil6210/txrx.h | 13 +++++++++----
2 files changed, 23 insertions(+), 10 deletions(-)
diff --git a/drivers/net/wireless/ath/wil6210/txrx.c b/drivers/net/wireless/ath/wil6210/txrx.c
index 1bfa736..d861944 100644
--- a/drivers/net/wireless/ath/wil6210/txrx.c
+++ b/drivers/net/wireless/ath/wil6210/txrx.c
@@ -193,8 +193,7 @@ static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring,
* - Phy info
*/
static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
- struct sk_buff *skb,
- volatile struct vring_rx_desc *d)
+ struct sk_buff *skb)
{
struct wireless_dev *wdev = wil->wdev;
struct wil6210_rtap {
@@ -218,6 +217,7 @@ static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
__le16 vendor_skip;
u8 vendor_data[0];
} __packed;
+ struct vring_rx_desc *d = wil_skb_rxdesc(skb);
struct wil6210_rtap_vendor *rtap_vendor;
int rtap_len = sizeof(struct wil6210_rtap);
int phy_length = 0; /* phy info header size, bytes */
@@ -314,6 +314,8 @@ static void wil_swap_ethaddr(void *data)
/**
* reap 1 frame from @swhead
*
+ * Rx descriptor copied to skb->cb
+ *
* Safe to call from IRQ
*/
static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
@@ -322,12 +324,15 @@ static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
struct device *dev = wil_to_dev(wil);
struct net_device *ndev = wil_to_ndev(wil);
volatile struct vring_rx_desc *d;
+ struct vring_rx_desc *d1;
struct sk_buff *skb;
dma_addr_t pa;
unsigned int sz = RX_BUF_LEN;
u8 ftype;
u8 ds_bits;
+ BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb));
+
if (wil_vring_is_empty(vring))
return NULL;
@@ -342,11 +347,14 @@ static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
skb_trim(skb, d->dma.length);
- wil->stats.last_mcs_rx = wil_rxdesc_mcs(d);
+ d1 = wil_skb_rxdesc(skb);
+ *d1 = *d;
+
+ wil->stats.last_mcs_rx = wil_rxdesc_mcs(d1);
/* use radiotap header only if required */
if (ndev->type == ARPHRD_IEEE80211_RADIOTAP)
- wil_rx_add_radiotap_header(wil, skb, d);
+ wil_rx_add_radiotap_header(wil, skb);
wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", vring->swhead, d->dma.length);
wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4,
@@ -362,7 +370,7 @@ static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
* Driver should recognize it by frame type, that is found
* in Rx descriptor. If type is not data, it is 802.11 frame as is
*/
- ftype = wil_rxdesc_ftype(d) << 2;
+ ftype = wil_rxdesc_ftype(d1) << 2;
if (ftype != IEEE80211_FTYPE_DATA) {
wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype);
/* TODO: process it */
@@ -377,7 +385,7 @@ static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
return NULL;
}
- ds_bits = wil_rxdesc_ds_bits(d);
+ ds_bits = wil_rxdesc_ds_bits(d1);
if (ds_bits == 1) {
/*
* HW bug - in ToDS mode, i.e. Rx on AP side,
diff --git a/drivers/net/wireless/ath/wil6210/txrx.h b/drivers/net/wireless/ath/wil6210/txrx.h
index 45a61f5..f0cc48a 100644
--- a/drivers/net/wireless/ath/wil6210/txrx.h
+++ b/drivers/net/wireless/ath/wil6210/txrx.h
@@ -339,24 +339,29 @@ union vring_desc {
struct vring_rx_desc rx;
} __packed;
-static inline int wil_rxdesc_phy_length(volatile struct vring_rx_desc *d)
+static inline int wil_rxdesc_phy_length(struct vring_rx_desc *d)
{
return WIL_GET_BITS(d->dma.d0, 16, 29);
}
-static inline int wil_rxdesc_mcs(volatile struct vring_rx_desc *d)
+static inline int wil_rxdesc_mcs(struct vring_rx_desc *d)
{
return WIL_GET_BITS(d->mac.d1, 21, 24);
}
-static inline int wil_rxdesc_ds_bits(volatile struct vring_rx_desc *d)
+static inline int wil_rxdesc_ds_bits(struct vring_rx_desc *d)
{
return WIL_GET_BITS(d->mac.d1, 8, 9);
}
-static inline int wil_rxdesc_ftype(volatile struct vring_rx_desc *d)
+static inline int wil_rxdesc_ftype(struct vring_rx_desc *d)
{
return WIL_GET_BITS(d->mac.d0, 10, 11);
}
+static inline struct vring_rx_desc *wil_skb_rxdesc(struct sk_buff *skb)
+{
+ return (void *)skb->cb;
+}
+
#endif /* WIL6210_TXRX_H */
--
1.7.10.4
--
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