[dpdk-dev,v6,1/2] net/vhost: add a new defined stats struct

  The patch moves all stats counters to a new defined struct vhost_stats
as follows, in order to manage all stats counters in a unified way and
simplify the subsequent function implementation(vhost_dev_xstats_reset).

Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>
---

Changes in v4:
A queue can be only used as TX or RX, So, we can use pkts instead of
rx_pkts and tx_pkts, the same to rx_bytes and tx_bytes.
before modification:
struct vhost_stats {
	uint64_t rx_pkts;
	uint64_t tx_pkts;
	uint64_t missed_pkts;
	uint64_t rx_bytes;
	uint64_t tx_bytes;
};
New struct vhost_stats definition as follows:
struct vhost_stats {
	uint64_t pkts;
	uint64_t bytes;
	uint64_t missed_pkts;
};

 drivers/net/vhost/rte_eth_vhost.c | 36 +++++++++++++++++++++---------------
 1 file changed, 21 insertions(+), 15 deletions(-)
  

Patch 1 moves all stats counters to a new defined struct vhost_stats,
in order to manage all stats counters in a consistent way.

Patch 2 adds the pmd xstats support from per port perspective.

Changes in V7:

Patch 2
Removed the "_portX" prepend to the xstat names. Keep vhost xstats name
consistent with physical NIC i40e, ixgbe, etc.

Changes in V6:

Patch 2:
1. Change xstats from per queue to per port. Keep vhost consistent with
physical NIC i40e, ixgbe, etc.
2. Added the release note.

Changes in V5:

Patch 2:
for vhost_count_multicast_broadcast, passing struct rte_mbuf *buf instead
of struct rte_mbuf **buf and remove the 3th parameter uint16_t count;.

Changes in v4:

Patch 1:
A queue can be only used as TX or RX, So, we can use pkts instead of
rx_pkts and tx_pkts, the same to rx_bytes and tx_bytes.
Before modification:
struct vhost_stats {
	uint64_t rx_pkts;
	uint64_t tx_pkts;
	uint64_t missed_pkts;
	uint64_t rx_bytes;
	uint64_t tx_bytes;
};
New struct vhost_stats definition as follows:
struct vhost_stats {
	uint64_t pkts;
	uint64_t bytes;
	uint64_t missed_pkts;
};

Patch 2:
1. add a member VHOST_XSTATS_MAX in enum vhost_xstats_pkts, So, we can
define uint64_t xstats[VHOST_XSTATS_MAX]; instead of xstats[16].
2. restore unicast_packets and update it in the function
vhost_dev_xstats_get
3. move the loop out of function vhost_count_multicast_broadcast in order
to reduce the computation.

Changes in v3:
1. rework the vhost_update_packet_xstats and separate it into two parts.
   One function deals with the generic packets update, another one deals
   with increasing the broadcast and multicast with failure packets sent
   according to RFC2863 page42 ifHCOutMulticastPkts ifHCOutBroadcastPkts.
2. define enum vhost_stat_pkts to replace the magic numbers and enhance
   the code readability.
3. remove some unnecessary type casts and fix one format issue.

Changes in v2:
1. remove the compiling switch.
2. fix two code bugs.

---
Zhiyong Yang (2):
  net/vhost: add a new defined stats struct
  net/vhost: add pmd xstats

 doc/guides/rel_notes/release_16_11.rst |   4 +
 drivers/net/vhost/rte_eth_vhost.c      | 312 ++++++++++++++++++++++++++++++---
 2 files changed, 296 insertions(+), 20 deletions(-)