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Subject[PATCH 2/3] Netvsc: Use the vmbus functiton to calculate ring buffer percentage
Date
From: Long Li <longli@microsoft.com>

In Vmbus, we have defined a function to calculate available ring buffer
percentage to write.

Use that function and remove duplicate netvsc code.

Signed-off-by: Long Li <longli@microsoft.com>
---
drivers/net/hyperv/netvsc.c | 17 +++--------------
drivers/net/hyperv/netvsc_drv.c | 3 ---
2 files changed, 3 insertions(+), 17 deletions(-)

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 0265d703eb03..8af0069e4d8c 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -31,7 +31,6 @@
#include <linux/vmalloc.h>
#include <linux/rtnetlink.h>
#include <linux/prefetch.h>
-#include <linux/reciprocal_div.h>

#include <asm/sync_bitops.h>

@@ -590,17 +589,6 @@ void netvsc_device_remove(struct hv_device *device)
#define RING_AVAIL_PERCENT_HIWATER 20
#define RING_AVAIL_PERCENT_LOWATER 10

-/*
- * Get the percentage of available bytes to write in the ring.
- * The return value is in range from 0 to 100.
- */
-static u32 hv_ringbuf_avail_percent(const struct hv_ring_buffer_info *ring_info)
-{
- u32 avail_write = hv_get_bytes_to_write(ring_info);
-
- return reciprocal_divide(avail_write * 100, netvsc_ring_reciprocal);
-}
-
static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
u32 index)
{
@@ -649,7 +637,8 @@ static void netvsc_send_tx_complete(struct netvsc_device *net_device,
wake_up(&net_device->wait_drain);

if (netif_tx_queue_stopped(netdev_get_tx_queue(ndev, q_idx)) &&
- (hv_ringbuf_avail_percent(&channel->outbound) > RING_AVAIL_PERCENT_HIWATER ||
+ (hv_get_avail_to_write_percent(&channel->outbound) >
+ RING_AVAIL_PERCENT_HIWATER ||
queue_sends < 1)) {
netif_tx_wake_queue(netdev_get_tx_queue(ndev, q_idx));
ndev_ctx->eth_stats.wake_queue++;
@@ -757,7 +746,7 @@ static inline int netvsc_send_pkt(
struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx);
u64 req_id;
int ret;
- u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound);
+ u32 ring_avail = hv_get_avail_to_write_percent(&out_channel->outbound);

nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
if (skb)
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index faea0be18924..b0b1c2fd2b7b 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -35,7 +35,6 @@
#include <linux/slab.h>
#include <linux/rtnetlink.h>
#include <linux/netpoll.h>
-#include <linux/reciprocal_div.h>

#include <net/arp.h>
#include <net/route.h>
@@ -55,7 +54,6 @@ static unsigned int ring_size __ro_after_init = 128;
module_param(ring_size, uint, S_IRUGO);
MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
unsigned int netvsc_ring_bytes __ro_after_init;
-struct reciprocal_value netvsc_ring_reciprocal __ro_after_init;

static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
NETIF_MSG_LINK | NETIF_MSG_IFUP |
@@ -2186,7 +2184,6 @@ static int __init netvsc_drv_init(void)
ring_size);
}
netvsc_ring_bytes = ring_size * PAGE_SIZE;
- netvsc_ring_reciprocal = reciprocal_value(netvsc_ring_bytes);

ret = vmbus_driver_register(&netvsc_drv);
if (ret)
--
2.14.1
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