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Subject[PATCH v2 36/50] wilc1000: introduce transmit path chip queue
Date
This introduces a chip queue that will hold packets ready to be
transferred to the chip. A later patch will start using it.

Signed-off-by: David Mosberger-Tang <davidm@egauge.net>
---
.../net/wireless/microchip/wilc1000/cfg80211.c | 3 +++
.../net/wireless/microchip/wilc1000/netdev.h | 18 ++++++++++++++++++
drivers/net/wireless/microchip/wilc1000/wlan.c | 5 +++++
3 files changed, 26 insertions(+)

diff --git a/drivers/net/wireless/microchip/wilc1000/cfg80211.c b/drivers/net/wireless/microchip/wilc1000/cfg80211.c
index 6f19dee813f2a..6d3635864569f 100644
--- a/drivers/net/wireless/microchip/wilc1000/cfg80211.c
+++ b/drivers/net/wireless/microchip/wilc1000/cfg80211.c
@@ -1716,6 +1716,9 @@ int wilc_cfg80211_init(struct wilc **wilc, struct device *dev, int io_type,
for (i = 0; i < NQUEUES; i++)
skb_queue_head_init(&wl->txq[i]);

+ skb_queue_head_init(&wl->chipq);
+ wl->chipq_bytes = 0;
+
INIT_LIST_HEAD(&wl->rxq_head.list);
INIT_LIST_HEAD(&wl->vif_list);

diff --git a/drivers/net/wireless/microchip/wilc1000/netdev.h b/drivers/net/wireless/microchip/wilc1000/netdev.h
index 82f38a0e20214..e168f8644c678 100644
--- a/drivers/net/wireless/microchip/wilc1000/netdev.h
+++ b/drivers/net/wireless/microchip/wilc1000/netdev.h
@@ -261,6 +261,24 @@ struct wilc {
struct wilc_tx_queue_status tx_q_limit;
struct rxq_entry_t rxq_head;

+ /* The chip queue contains sk_buffs that are ready to be
+ * transferred to the wilc1000 chip. In particular, they
+ * already have the VMM and Ethernet headers (for net packets)
+ * and they are padded to a size that is an integer-multiple
+ * of 4 bytes.
+ *
+ * This queue is usually empty on return from
+ * wilc_wlan_handle_txq(). However, when the chip does fill
+ * up, the packets that didn't fit will be held until there is
+ * space again.
+ *
+ * This queue is only accessed by the txq handler thread, so
+ * no locking is required.
+ */
+ struct sk_buff_head chipq;
+ /* Total number of bytes queued on the chipq: */
+ int chipq_bytes;
+
const struct firmware *firmware;

struct device *dev;
diff --git a/drivers/net/wireless/microchip/wilc1000/wlan.c b/drivers/net/wireless/microchip/wilc1000/wlan.c
index 18b1e7fad4d71..c3802a34defed 100644
--- a/drivers/net/wireless/microchip/wilc1000/wlan.c
+++ b/drivers/net/wireless/microchip/wilc1000/wlan.c
@@ -1263,6 +1263,11 @@ void wilc_wlan_cleanup(struct net_device *dev)
struct wilc *wilc = vif->wilc;

wilc->quit = 1;
+
+ while ((tqe = __skb_dequeue(&wilc->chipq)))
+ wilc_wlan_tx_packet_done(tqe, 0);
+ wilc->chipq_bytes = 0;
+
for (ac = 0; ac < NQUEUES; ac++) {
while ((tqe = skb_dequeue(&wilc->txq[ac])))
wilc_wlan_tx_packet_done(tqe, 0);
--
2.25.1
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