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SubjectRE: [PATCH 2/3] Netvsc: Use the vmbus functiton to calculate ring buffer percentage
Date


> -----Original Message-----
> From: Long Li <longli@linuxonhyperv.com>
> Sent: Thursday, March 22, 2018 8:16 PM
> To: KY Srinivasan <kys@microsoft.com>; Haiyang Zhang
> <haiyangz@microsoft.com>; Stephen Hemminger <sthemmin@microsoft.com>;
> James E . J . Bottomley <JBottomley@odin.com>; Martin K . Petersen
> <martin.petersen@oracle.com>; devel@linuxdriverproject.org; linux-
> scsi@vger.kernel.org; linux-kernel@vger.kernel.org
> Cc: Long Li <longli@microsoft.com>
> Subject: [PATCH 2/3] Netvsc: Use the vmbus functiton to calculate ring buffer
> percentage
>
> 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)
> --


Please also remove netvsc_ring_reciprocal from hyperv_net.h
Thanks.

Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>

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