> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Jay Rolette
> Sent: Thursday, June 4, 2015 3:08 AM
> To: dev at dpdk.org
> Subject: [dpdk-dev] [PATCH 2/3] kni: minor opto
>
> No reason to check out many entries are in kni->rx_q prior to actually pulling
> them from the fifo. You can't dequeue more than are there anyway. Max entries
> to dequeue is either the max batch size or however much space is available on
> kni->free_q (lesser of the two)
>
> Signed-off-by: Jay Rolette <rolette at infiniteio.com>
Acked-by: Helin Zhang <helin.zhang at intel.com>
> ---
> lib/librte_eal/linuxapp/kni/kni_net.c | 21 ++++++++-------------
> 1 file changed, 8 insertions(+), 13 deletions(-)
>
> diff --git a/lib/librte_eal/linuxapp/kni/kni_net.c
> b/lib/librte_eal/linuxapp/kni/kni_net.c
> index dd95db5..13ccbb8 100644
> --- a/lib/librte_eal/linuxapp/kni/kni_net.c
> +++ b/lib/librte_eal/linuxapp/kni/kni_net.c
> @@ -131,7 +131,7 @@ kni_net_rx_normal(struct kni_dev *kni) {
> unsigned ret;
> uint32_t len;
> - unsigned i, num, num_rq, num_fq;
> + unsigned i, num, num_fq;
> struct rte_kni_mbuf *kva;
> struct rte_kni_mbuf *va[MBUF_BURST_SZ];
> void * data_kva;
> @@ -139,24 +139,19 @@ kni_net_rx_normal(struct kni_dev *kni)
> struct sk_buff *skb;
> struct net_device *dev = kni->net_dev;
>
> - /* Get the number of entries in rx_q */
> - num_rq = kni_fifo_count(kni->rx_q);
> -
> /* Get the number of free entries in free_q */
> - num_fq = kni_fifo_free_count(kni->free_q);
> -
> - /* Calculate the number of entries to dequeue in rx_q */
> - num = min(num_rq, num_fq);
> - num = min(num, (unsigned)MBUF_BURST_SZ);
> -
> - /* Return if no entry in rx_q and no free entry in free_q */
> - if (num == 0)
> + if ((num_fq = kni_fifo_free_count(kni->free_q)) == 0) {
> + /* No room on the free_q, bail out */
> return;
> + }
> +
> + /* Calculate the number of entries to dequeue from rx_q */
> + num = min(num_fq, (unsigned)MBUF_BURST_SZ);
>
> /* Burst dequeue from rx_q */
> ret = kni_fifo_get(kni->rx_q, (void **)va, num);
> if (ret == 0)
> - return; /* Failing should not happen */
> + return;
>
> /* Transfer received packets to netif */
> for (i = 0; i < num; i++) {
> --
> 2.3.2 (Apple Git-55)
