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Date: Fri, 20 Mar 2015 14:01:26 +0000
From: KY Srinivasan <kys@...rosoft.com>
To: Jason Wang <jasowang@...hat.com>
CC: "davem@...emloft.net" <davem@...emloft.net>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
"olaf@...fle.de" <olaf@...fle.de>,
"apw@...onical.com" <apw@...onical.com>
Subject: RE: [PATCH V3 2/2 net-next] hyperv: Support batched notification
> -----Original Message-----
> From: Jason Wang [mailto:jasowang@...hat.com]
> Sent: Thursday, March 19, 2015 10:58 PM
> To: KY Srinivasan
> Cc: davem@...emloft.net; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; devel@...uxdriverproject.org; olaf@...fle.de;
> apw@...onical.com
> Subject: RE: [PATCH V3 2/2 net-next] hyperv: Support batched notification
>
>
>
> On Fri, Mar 20, 2015 at 12:53 AM, KY Srinivasan <kys@...rosoft.com>
> wrote:
> >
> >
> >> -----Original Message-----
> >> From: Jason Wang [mailto:jasowang@...hat.com]
> >> Sent: Tuesday, March 17, 2015 8:09 PM
> >> To: KY Srinivasan
> >> Cc: davem@...emloft.net; netdev@...r.kernel.org; linux-
> >> kernel@...r.kernel.org; devel@...uxdriverproject.org;
> >> olaf@...fle.de;
> >> apw@...onical.com; KY Srinivasan
> >> Subject: Re: [PATCH V3 2/2 net-next] hyperv: Support batched
> >> notification
> >>
> >>
> >>
> >> On Wed, Mar 18, 2015 at 12:02 AM, K. Y. Srinivasan
> >> <kys@...rosoft.com>
> >> wrote:
> >> > Optimize notifying the host by deferring notification until there
> >> > are no more packets to be sent. This will help in batching the
> >> > requests
> >> > on the host.
> >> >
> >> > Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> >> > ---
> >> > drivers/net/hyperv/hyperv_net.h | 2 +-
> >> > drivers/net/hyperv/netvsc.c | 14 +++++++++-----
> >> > drivers/net/hyperv/netvsc_drv.c | 2 +-
> >> > drivers/net/hyperv/rndis_filter.c | 2 +-
> >> > 4 files changed, 12 insertions(+), 8 deletions(-)
> >> >
> >> > diff --git a/drivers/net/hyperv/hyperv_net.h
> >> > b/drivers/net/hyperv/hyperv_net.h
> >> > index 4815843..3fd9896 100644
> >> > --- a/drivers/net/hyperv/hyperv_net.h
> >> > +++ b/drivers/net/hyperv/hyperv_net.h
> >> > @@ -184,7 +184,7 @@ struct rndis_device {
> >> > int netvsc_device_add(struct hv_device *device, void
> >> > *additional_info);
> >> > int netvsc_device_remove(struct hv_device *device);
> >> > int netvsc_send(struct hv_device *device,
> >> > - struct hv_netvsc_packet *packet);
> >> > + struct hv_netvsc_packet *packet, bool kick_q);
> >> > void netvsc_linkstatus_callback(struct hv_device *device_obj,
> >> > struct rndis_message *resp);
> >> > int netvsc_recv_callback(struct hv_device *device_obj,
> >> > diff --git a/drivers/net/hyperv/netvsc.c
> >> b/drivers/net/hyperv/netvsc.c
> >> > index 208eb05..9003b94 100644
> >> > --- a/drivers/net/hyperv/netvsc.c
> >> > +++ b/drivers/net/hyperv/netvsc.c
> >> > @@ -707,7 +707,7 @@ static u32 netvsc_copy_to_send_buf(struct
> >> > netvsc_device *net_device,
> >> > }
> >> >
> >> > int netvsc_send(struct hv_device *device,
> >> > - struct hv_netvsc_packet *packet)
> >> > + struct hv_netvsc_packet *packet, bool kick_q)
> >> > {
> >> > struct netvsc_device *net_device;
> >> > int ret = 0;
> >> > @@ -719,6 +719,7 @@ int netvsc_send(struct hv_device *device,
> >> > u32 msg_size = 0;
> >> > struct sk_buff *skb = NULL;
> >> > u16 q_idx = packet->q_idx;
> >> > + u32 vmbus_flags =
> >> VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
> >> >
> >> >
> >> > net_device = get_outbound_net_device(device);
> >> > @@ -768,18 +769,21 @@ int netvsc_send(struct hv_device *device,
> >> > return -ENODEV;
> >> >
> >> > if (packet->page_buf_cnt) {
> >> > - ret = vmbus_sendpacket_pagebuffer(out_channel,
> >> > + ret = vmbus_sendpacket_pagebuffer_ctl(out_channel,
> >> > packet->page_buf,
> >> > packet->page_buf_cnt,
> >> > &sendMessage,
> >> > sizeof(struct
> >> nvsp_message),
> >> > - req_id);
> >> > + req_id,
> >> > + vmbus_flags,
> >> > + kick_q);
> >> > } else {
> >> > - ret = vmbus_sendpacket(out_channel, &sendMessage,
> >> > + ret = vmbus_sendpacket_ctl(out_channel, &sendMessage,
> >> > sizeof(struct nvsp_message),
> >> > req_id,
> >> > VM_PKT_DATA_INBAND,
> >> > -
> >> VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
> >> > + vmbus_flags,
> >> > + kick_q);
> >> > }
> >> >
> >> > if (ret == 0) {
> >> > diff --git a/drivers/net/hyperv/netvsc_drv.c
> >> > b/drivers/net/hyperv/netvsc_drv.c
> >> > index a06bd66..eae58db 100644
> >> > --- a/drivers/net/hyperv/netvsc_drv.c
> >> > +++ b/drivers/net/hyperv/netvsc_drv.c
> >> > @@ -556,7 +556,7 @@ do_send:
> >> > packet->page_buf_cnt = init_page_array(rndis_msg,
> >> rndis_msg_size,
> >> > skb, &packet->page_buf[0]);
> >> >
> >> > - ret = netvsc_send(net_device_ctx->device_ctx, packet);
> >> > + ret = netvsc_send(net_device_ctx->device_ctx, packet,
> >> > !skb->xmit_more);
> >> >
> >>
> >> Looks like the issue of V2 still there (E.g we need to kick when
> >> hv_ringbuffer_write() returns -EAGAIN?
> >
> > Jason, this issue will be handled in the lower layer. I have already
> > submitted a patch to the vmbus
> > Driver that correctly signals the host when EAGAIN is encountered.
> >
> > Regards,
> >
> > K. Y
>
> Okay, find the mail but looks like I was not cced.
>
> Please keep me in the cc list for hyperv patches.
Sorry about that; will do.
K. Y
>
> Thanks
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