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authorMaya Erez <merez@codeaurora.org>2019-02-28 10:35:08 +0100
committerKalle Valo <kvalo@codeaurora.org>2019-04-03 14:45:17 +0200
commitb4a967b7d0f5cee75cfa343b7498eb92a8735594 (patch)
tree08facfcd93d77f0d3cdb47f97eb79cc63d1f224f
parentwil6210: add support for ucode tracing (diff)
downloadlinux-b4a967b7d0f5cee75cfa343b7498eb92a8735594.tar.xz
linux-b4a967b7d0f5cee75cfa343b7498eb92a8735594.zip
wil6210: reset buff id in status message after completion
Since DR bit and buffer id are written in different dwords of the status message, the DR bit can already be set to 1 while the buffer id is not updated yet. Resetting the buffer id in the status message will allow the driver to identify such cases and re-read the status message until the buffer id is written by HW. In case DR bit is set but buffer id is zero, need to read the status message again, until a valid id is identified. In addition to that, move the completed buffer id to the tail of the free list to prevent its immediate reuse in the upcoming refill. Signed-off-by: Maya Erez <merez@codeaurora.org> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
-rw-r--r--drivers/net/wireless/ath/wil6210/debugfs.c2
-rw-r--r--drivers/net/wireless/ath/wil6210/txrx_edma.c50
-rw-r--r--drivers/net/wireless/ath/wil6210/txrx_edma.h6
-rw-r--r--drivers/net/wireless/ath/wil6210/wil6210.h1
4 files changed, 48 insertions, 11 deletions
diff --git a/drivers/net/wireless/ath/wil6210/debugfs.c b/drivers/net/wireless/ath/wil6210/debugfs.c
index 78320ec125c4..df2adff6c33a 100644
--- a/drivers/net/wireless/ath/wil6210/debugfs.c
+++ b/drivers/net/wireless/ath/wil6210/debugfs.c
@@ -207,6 +207,8 @@ static void wil_print_sring(struct seq_file *s, struct wil6210_priv *wil,
seq_puts(s, "???\n");
}
seq_printf(s, " desc_rdy_pol = %d\n", sring->desc_rdy_pol);
+ seq_printf(s, " invalid_buff_id_cnt = %d\n",
+ sring->invalid_buff_id_cnt);
if (sring->va && (sring->size <= (1 << WIL_RING_SIZE_ORDER_MAX))) {
uint i;
diff --git a/drivers/net/wireless/ath/wil6210/txrx_edma.c b/drivers/net/wireless/ath/wil6210/txrx_edma.c
index 492f7bdf39d9..f6fce6ff73d9 100644
--- a/drivers/net/wireless/ath/wil6210/txrx_edma.c
+++ b/drivers/net/wireless/ath/wil6210/txrx_edma.c
@@ -29,6 +29,7 @@
#define WIL_EDMA_MAX_DATA_OFFSET (2)
/* RX buffer size must be aligned to 4 bytes */
#define WIL_EDMA_RX_BUF_LEN_DEFAULT (2048)
+#define MAX_INVALID_BUFF_ID_RETRY (3)
static void wil_tx_desc_unmap_edma(struct device *dev,
union wil_tx_desc *desc,
@@ -312,7 +313,8 @@ static int wil_init_rx_buff_arr(struct wil6210_priv *wil,
struct list_head *free = &wil->rx_buff_mgmt.free;
int i;
- wil->rx_buff_mgmt.buff_arr = kcalloc(size, sizeof(struct wil_rx_buff),
+ wil->rx_buff_mgmt.buff_arr = kcalloc(size + 1,
+ sizeof(struct wil_rx_buff),
GFP_KERNEL);
if (!wil->rx_buff_mgmt.buff_arr)
return -ENOMEM;
@@ -321,14 +323,16 @@ static int wil_init_rx_buff_arr(struct wil6210_priv *wil,
INIT_LIST_HEAD(active);
INIT_LIST_HEAD(free);
- /* Linkify the list */
+ /* Linkify the list.
+ * buffer id 0 should not be used (marks invalid id).
+ */
buff_arr = wil->rx_buff_mgmt.buff_arr;
- for (i = 0; i < size; i++) {
+ for (i = 1; i <= size; i++) {
list_add(&buff_arr[i].list, free);
buff_arr[i].id = i;
}
- wil->rx_buff_mgmt.size = size;
+ wil->rx_buff_mgmt.size = size + 1;
return 0;
}
@@ -876,26 +880,50 @@ again:
/* Extract the buffer ID from the status message */
buff_id = le16_to_cpu(wil_rx_status_get_buff_id(msg));
- if (unlikely(!wil_val_in_range(buff_id, 0, wil->rx_buff_mgmt.size))) {
+
+ while (!buff_id) {
+ struct wil_rx_status_extended *s;
+ int invalid_buff_id_retry = 0;
+
+ wil_dbg_txrx(wil,
+ "buff_id is not updated yet by HW, (swhead 0x%x)\n",
+ sring->swhead);
+ if (++invalid_buff_id_retry > MAX_INVALID_BUFF_ID_RETRY)
+ break;
+
+ /* Read the status message again */
+ s = (struct wil_rx_status_extended *)
+ (sring->va + (sring->elem_size * sring->swhead));
+ *(struct wil_rx_status_extended *)msg = *s;
+ buff_id = le16_to_cpu(wil_rx_status_get_buff_id(msg));
+ }
+
+ if (unlikely(!wil_val_in_range(buff_id, 1, wil->rx_buff_mgmt.size))) {
wil_err(wil, "Corrupt buff_id=%d, sring->swhead=%d\n",
buff_id, sring->swhead);
+ wil_rx_status_reset_buff_id(sring);
wil_sring_advance_swhead(sring);
+ sring->invalid_buff_id_cnt++;
goto again;
}
- wil_sring_advance_swhead(sring);
-
/* Extract the SKB from the rx_buff management array */
skb = wil->rx_buff_mgmt.buff_arr[buff_id].skb;
wil->rx_buff_mgmt.buff_arr[buff_id].skb = NULL;
if (!skb) {
wil_err(wil, "No Rx skb at buff_id %d\n", buff_id);
+ wil_rx_status_reset_buff_id(sring);
/* Move the buffer from the active list to the free list */
- list_move(&wil->rx_buff_mgmt.buff_arr[buff_id].list,
- &wil->rx_buff_mgmt.free);
+ list_move_tail(&wil->rx_buff_mgmt.buff_arr[buff_id].list,
+ &wil->rx_buff_mgmt.free);
+ wil_sring_advance_swhead(sring);
+ sring->invalid_buff_id_cnt++;
goto again;
}
+ wil_rx_status_reset_buff_id(sring);
+ wil_sring_advance_swhead(sring);
+
memcpy(&pa, skb->cb, sizeof(pa));
dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
dmalen = le16_to_cpu(wil_rx_status_get_length(msg));
@@ -910,8 +938,8 @@ again:
sizeof(struct wil_rx_status_extended), false);
/* Move the buffer from the active list to the free list */
- list_move(&wil->rx_buff_mgmt.buff_arr[buff_id].list,
- &wil->rx_buff_mgmt.free);
+ list_move_tail(&wil->rx_buff_mgmt.buff_arr[buff_id].list,
+ &wil->rx_buff_mgmt.free);
eop = wil_rx_status_get_eop(msg);
diff --git a/drivers/net/wireless/ath/wil6210/txrx_edma.h b/drivers/net/wireless/ath/wil6210/txrx_edma.h
index 9cf9ecf6e8cf..bb4ff28b73e5 100644
--- a/drivers/net/wireless/ath/wil6210/txrx_edma.h
+++ b/drivers/net/wireless/ath/wil6210/txrx_edma.h
@@ -427,6 +427,12 @@ static inline int wil_rx_status_get_eop(void *msg) /* EoP = End of Packet */
30, 30);
}
+static inline void wil_rx_status_reset_buff_id(struct wil_status_ring *s)
+{
+ ((struct wil_rx_status_compressed *)
+ (s->va + (s->elem_size * s->swhead)))->buff_id = 0;
+}
+
static inline __le16 wil_rx_status_get_buff_id(void *msg)
{
return ((struct wil_rx_status_compressed *)msg)->buff_id;
diff --git a/drivers/net/wireless/ath/wil6210/wil6210.h b/drivers/net/wireless/ath/wil6210/wil6210.h
index f508d52c867a..8724d9975606 100644
--- a/drivers/net/wireless/ath/wil6210/wil6210.h
+++ b/drivers/net/wireless/ath/wil6210/wil6210.h
@@ -568,6 +568,7 @@ struct wil_status_ring {
bool is_rx;
u8 desc_rdy_pol; /* Expected descriptor ready bit polarity */
struct wil_ring_rx_data rx_data;
+ u32 invalid_buff_id_cnt; /* relevant only for RX */
};
#define WIL_STA_TID_NUM (16)