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wifi: wilc1000: add back-off algorithm to balance tx queue packets

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Add an algorithm to backoff the Tx Task when low memory scenario is
triggered at firmware. During high data transfer from host, the firmware
runs out of VMM memory, which is used to hold the frames from the host.
So, adding the flow control delays the transmit from host side when
there is not enough space to accommodate frames in firmware side.

Signed-off-by: Prasurjya Rohan Saikia <prasurjya.rohansaikia@microchip.com>
Acked-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230915175946.4361-1-prasurjya.rohansaikia@microchip.com
This commit is contained in:
Prasurjya Rohan Saikia 2023-09-15 18:00:40 +00:00 committed by Kalle Valo
parent 260323c3a3
commit a08bb28f6e
2 changed files with 18 additions and 4 deletions
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20
drivers/net/wireless/microchip/wilc1000/netdev.c
View File

@ -148,8 +148,8 @@ static int wilc_txq_task(void *vp)
complete(&wl->txq_thread_started);
while (1) {
wait_for_completion(&wl->txq_event);
if (wait_for_completion_interruptible(&wl->txq_event))
continue;
if (wl->close) {
complete(&wl->txq_thread_started);
@ -166,12 +166,24 @@ static int wilc_txq_task(void *vp)
srcu_idx = srcu_read_lock(&wl->srcu);
list_for_each_entry_rcu(ifc, &wl->vif_list,
list) {
if (ifc->mac_opened && ifc->ndev)
if (ifc->mac_opened &&
netif_queue_stopped(ifc->ndev))
netif_wake_queue(ifc->ndev);
}
srcu_read_unlock(&wl->srcu, srcu_idx);
}
} while (ret == WILC_VMM_ENTRY_FULL_RETRY && !wl->close);
if (ret != WILC_VMM_ENTRY_FULL_RETRY)
break;
/* Back off TX task from sending packets for some time.
* msleep_interruptible will allow RX task to run and
* free buffers. TX task will be in TASK_INTERRUPTIBLE
* state which will put the thread back to CPU running
* queue when it's signaled even if the timeout isn't
* elapsed. This gives faster chance for reserved SK
* buffers to be free.
*/
msleep_interruptible(TX_BACKOFF_WEIGHT_MS);
} while (!wl->close);
}
return 0;
}

2
drivers/net/wireless/microchip/wilc1000/netdev.h
View File

@ -27,6 +27,8 @@
#define TCP_ACK_FILTER_LINK_SPEED_THRESH 54
#define DEFAULT_LINK_SPEED 72
#define TX_BACKOFF_WEIGHT_MS 1
struct wilc_wfi_stats {
unsigned long rx_packets;
unsigned long tx_packets;