Messages in this thread | | | From | KY Srinivasan <> | Subject | RE: [PATCH V5 1/1] hv_netvsc: Use the xmit_more skb flag to optimize signaling the host | Date | Mon, 11 May 2015 08:59:53 +0000 |
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> -----Original Message----- > From: Joe Perches [mailto:joe@perches.com] > Sent: Sunday, May 10, 2015 10:58 PM > To: KY Srinivasan > Cc: davem@davemloft.net; netdev@vger.kernel.org; linux- > kernel@vger.kernel.org; devel@linuxdriverproject.org; olaf@aepfle.de; > apw@canonical.com; jasowang@redhat.com > Subject: Re: [PATCH V5 1/1] hv_netvsc: Use the xmit_more skb flag to > optimize signaling the host > > On Sun, 2015-05-10 at 21:08 -0700, K. Y. Srinivasan wrote: > > Based on the information given to this driver (via the xmit_more skb flag), > > we can defer signaling the host if more packets are on the way. This will > help > > make the host more efficient since it can potentially process a larger batch > of > > packets. Implement this optimization. > > trivia: > > I think that indirecting > VMBUS_DATA_PACKET_FLAG_COMPLETTION_REQUESTED > into a non-const temporary isn't very useful. > > Whenever overly long identifiers like VMBUS_<FOO> is used, > I think that it'd be better to use it directly and ignore > 80 column warnings.
Thanks Joe; if Dave agrees, I can send v6 of this patch out.
Regards,
K. Y > > Same with the "sizeof(struct nvsp_message)" on two lines. > > > diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c > [] > > @@ -743,6 +743,8 @@ static inline int netvsc_send_pkt( > > u64 req_id; > > int ret; > > struct hv_page_buffer *pgbuf; > > + u32 vmbus_flags = > VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; > > + u32 ring_avail = hv_ringbuf_avail_percent(&out_channel- > >outbound); > [] > > @@ -769,30 +771,41 @@ static inline int netvsc_send_pkt( > [] > > + ret = vmbus_sendpacket_pagebuffer_ctl(out_channel, > > + pgbuf, > > + packet->page_buf_cnt, > > + &nvmsg, > > + sizeof(struct > > + nvsp_message), > > + req_id, > > + vmbus_flags, > > + !packet->xmit_more); > > [] > > > netif_tx_stop_queue(netdev_get_tx_queue( > > ndev, q_idx)); > > This could be on one line too. >
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