app/testpmd: fix number of mbufs in pool

app/testpmd: fix number of mbufs in pool

The number of mbufs in pools is not consistent depending on the
options passed by the user and the number of ports, especially
in numa mode, when the number of mbuf is specified by the user.

When the user specifies the number of mbuf (per pool), it should
overrides the default value.

- before the patch

./build/app/testpmd -- -i
  <mbuf_pool_socket_0>: n=331456, size=2176, socket=0
  <mbuf_pool_socket_1>: n=331456, size=2176, socket=1

./build/app/testpmd -- --total-num-mbufs=8000 -i
  <mbuf_pool_socket_0>: n=256000, size=2176, socket=0
  <mbuf_pool_socket_1>: n=256000, size=2176, socket=1
  # BAD, should be n=8000 for each socket

./build/app/testpmd -- --no-numa -i
  <mbuf_pool_socket_0>: n=331456, size=2176, socket=0

./build/app/testpmd -- --no-numa --total-num-mbufs=8000 -i
  <mbuf_pool_socket_0>: n=8000, size=2176, socket=0

./build/app/testpmd --vdev=eth_null0 --vdev=eth_null1 -- -i
  <mbuf_pool_socket_0>: n=331456, size=2176, socket=0
  <mbuf_pool_socket_1>: n=331456, size=2176, socket=1

./build/app/testpmd --vdev=eth_null0 --vdev=eth_null1 -- \
     --total-num-mbufs=8000 -i
  <mbuf_pool_socket_0>: n=128000, size=2176, socket=0
  <mbuf_pool_socket_1>: n=128000, size=2176, socket=1
  # BAD, should be n=8000 for each socket

./build/app/testpmd --vdev=eth_null0 --vdev=eth_null1 -- --no-numa -i
  <mbuf_pool_socket_0>: n=331456, size=2176, socket=0

./build/app/testpmd --vdev=eth_null0 --vdev=eth_null1 -- --no-numa \
     --total-num-mbufs=8000 -i
  <mbuf_pool_socket_0>: n=8000, size=2176, socket=0

- after the patch

./build/app/testpmd -- -i
  <mbuf_pool_socket_0>: n=331456, size=2176, socket=0
  <mbuf_pool_socket_1>: n=331456, size=2176, socket=1

./build/app/testpmd -- --total-num-mbufs=8000 -i
  <mbuf_pool_socket_0>: n=8000, size=2176, socket=0
  <mbuf_pool_socket_1>: n=8000, size=2176, socket=1

./build/app/testpmd -- --no-numa -i
  <mbuf_pool_socket_0>: n=331456, size=2176, socket=0

./build/app/testpmd -- --no-numa --total-num-mbufs=8000 -i
  <mbuf_pool_socket_0>: n=8000, size=2176, socket=0

./build/app/testpmd --vdev=eth_null0 --vdev=eth_null1 -- -i
  <mbuf_pool_socket_0>: n=331456, size=2176, socket=0
  <mbuf_pool_socket_1>: n=331456, size=2176, socket=1

./build/app/testpmd --vdev=eth_null0 --vdev=eth_null1 -- \
     --total-num-mbufs=8000 -i
  <mbuf_pool_socket_0>: n=8000, size=2176, socket=0
  <mbuf_pool_socket_1>: n=8000, size=2176, socket=1

./build/app/testpmd --vdev=eth_null0 --vdev=eth_null1 -- --no-numa -i
  <mbuf_pool_socket_0>: n=331456, size=2176, socket=0

./build/app/testpmd --vdev=eth_null0 --vdev=eth_null1 -- --no-numa \
     --total-num-mbufs=8000 -i
  <mbuf_pool_socket_0>: n=8000, size=2176, socket=0

Fixes: b6ea6408fbc7 ("ethdev: store numa_node per device")
Cc: stable@dpdk.org
Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
Acked-by: Jingjing Wu <jingjing.wu@intel.com>