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Date: Wed, 6 May 2015 11:20:36 -0700 From: "K. Y. Srinivasan" <kys@...rosoft.com> To: davem@...emloft.net, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com, jasowang@...hat.com Cc: "K. Y. Srinivasan" <kys@...rosoft.com> Subject: [PATCH V3 net-next 1/1] hv_netvsc: Use the xmit_more skb flag to optimize signaling the host 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. Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com> --- v2: Fixed up indentation based on feedback from David Miller. v3: If the queue is stopped, deal with that condition: Eric Dumazet <eric.dumazet@...il.com> drivers/net/hyperv/netvsc.c | 20 ++++++++++++-------- drivers/net/hyperv/netvsc_drv.c | 2 ++ 2 files changed, 14 insertions(+), 8 deletions(-) diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index ea091bc..36fef17 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -743,6 +743,7 @@ 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; nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT; if (packet->is_data_pkt) { @@ -772,19 +773,22 @@ static inline int netvsc_send_pkt( if (packet->page_buf_cnt) { pgbuf = packet->cp_partial ? packet->page_buf + packet->rmsg_pgcnt : packet->page_buf; - ret = vmbus_sendpacket_pagebuffer(out_channel, - pgbuf, - packet->page_buf_cnt, - &nvmsg, - sizeof(struct nvsp_message), - req_id); + ret = vmbus_sendpacket_pagebuffer_ctl(out_channel, + pgbuf, + packet->page_buf_cnt, + &nvmsg, + sizeof(struct + nvsp_message), + req_id, + vmbus_flags, + !packet->xmit_more); } else { - ret = vmbus_sendpacket( + ret = vmbus_sendpacket_ctl( out_channel, &nvmsg, sizeof(struct nvsp_message), req_id, VM_PKT_DATA_INBAND, - VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); + vmbus_flags, !packet->xmit_more); } if (ret == 0) { diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c index 5993c7e..4efaa6e 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -435,6 +435,8 @@ check_size: packet->page_buf = page_buf; packet->q_idx = skb_get_queue_mapping(skb); + if (netif_tx_queue_stopped(netdev_get_tx_queue(net, packet->q_idx))) + packet->xmit_more = false; packet->is_data_pkt = true; packet->total_data_buflen = skb->len; -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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