[dpdk-dev] [PATCH v6] net/i40e: determine number of queues per VF during run time

[Wei Dai <wei.dai@intel.com>]

Without this patch, the number of queues per i40e  VF is defined as 4
by CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_VF=4 in config/common_base.
It is fixed value determined in building time and can't be changed
during run time.
With this patch, the number of queues per i40e VF can be determinated
during run time. For example, if the PCI address of an i40e VF is
aaaa:bb.cc, with the EAL parameter -w aaaa:bb.cc,queue-num-per-vf=8,
the number of queues per VF is 8.
If there is no "queue-num-per-vf" setting in EAL parameters, it is 4
by default as before. And if the value after the "queue-num-per-vf"
is invalid, it is set as 4 forcibly. The valid values include 1, 2, 4,
8, 16 .

Signed-off-by: Wei Dai <wei.dai@intel.com>

---
v6:
    fix a small bug when detecting end character of strtoul
v5:
    fix git log message and WARNING of coding stype
v4:
    use rte_kvargs instead of pervious parsing function;
    use malloc/free instead of rte_zmalloc/rte_free.
v3:
    fix WARNING of coding style issues from checkpatch@dpdk.org
v2:
    fix WARNING of coding style issues from checkpatch@dpdk.org
---
 config/common_base             |  1 -
 drivers/net/i40e/i40e_ethdev.c | 67 ++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 65 insertions(+), 3 deletions(-)

diff --git a/config/common_base b/config/common_base
index e74febe..4e20389 100644
--- a/config/common_base
+++ b/config/common_base
@@ -208,7 +208,6 @@ CONFIG_RTE_LIBRTE_I40E_RX_ALLOW_BULK_ALLOC=y
 CONFIG_RTE_LIBRTE_I40E_INC_VECTOR=y
 CONFIG_RTE_LIBRTE_I40E_16BYTE_RX_DESC=n
 CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_PF=64
-CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_VF=4
 CONFIG_RTE_LIBRTE_I40E_QUEUE_NUM_PER_VM=4
 # interval up to 8160 us, aligned to 2 (or default value)
 CONFIG_RTE_LIBRTE_I40E_ITR_INTERVAL=-1
diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 811cc9f..6eceea1 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -3971,6 +3971,67 @@ i40e_get_cap(struct i40e_hw *hw)
 	return ret;
 }
 
+#define RTE_LIBRTE_I40E_QUEUE_NUM_PER_VF	4
+#define QUEUE_NUM_PER_VF_ARG			"queue-num-per-vf"
+static int i40e_pf_parse_vf_queue_number_handler(const char *key,
+		const char *value,
+		void *opaque)
+{
+	struct i40e_pf *pf;
+	unsigned long num;
+	char *end;
+
+	pf = (struct i40e_pf *)opaque;
+	RTE_SET_USED(key);
+
+	errno = 0;
+	num = strtoul(value, &end, 0);
+	if (errno != 0 || end == value || *end != 0) {
+		PMD_DRV_LOG(WARNING, "Wrong VF queue number = %s, Now it is "
+			    "kept the value = %hu", value, pf->vf_nb_qp_max);
+		return -(EINVAL);
+	}
+
+	if (num <= 16 && rte_is_power_of_2(num))
+		pf->vf_nb_qp_max = (uint16_t)num;
+	else
+		/* here return 0 to make next valid same argument work */
+		PMD_DRV_LOG(WARNING, "Wrong VF queue number = %lu, it must be "
+			    "power of 2 and equal or less than 16 !, Now it is "
+			    "kept the value = %hu", num, pf->vf_nb_qp_max);
+
+	return 0;
+}
+
+static int i40e_pf_config_vf_rxq_number(struct rte_eth_dev *dev)
+{
+	static const char * const valid_keys[] = {QUEUE_NUM_PER_VF_ARG, ""};
+	struct i40e_pf *pf = I40E_DEV_PRIVATE_TO_PF(dev->data->dev_private);
+	struct rte_kvargs *kvlist;
+
+	/* set default queue number per VF as 4 */
+	pf->vf_nb_qp_max = RTE_LIBRTE_I40E_QUEUE_NUM_PER_VF;
+
+	if (dev->device->devargs == NULL)
+		return 0;
+
+	kvlist = rte_kvargs_parse(dev->device->devargs->args, valid_keys);
+	if (kvlist == NULL)
+		return -(EINVAL);
+
+	if (rte_kvargs_count(kvlist, QUEUE_NUM_PER_VF_ARG) > 1)
+		PMD_DRV_LOG(WARNING, "More than one argument \"%s\" and only "
+			    "the first invalid or last valid one is used !",
+			    QUEUE_NUM_PER_VF_ARG);
+
+	rte_kvargs_process(kvlist, QUEUE_NUM_PER_VF_ARG,
+			   i40e_pf_parse_vf_queue_number_handler, pf);
+
+	rte_kvargs_free(kvlist);
+
+	return 0;
+}
+
 static int
 i40e_pf_parameter_init(struct rte_eth_dev *dev)
 {
@@ -3983,6 +4044,9 @@ i40e_pf_parameter_init(struct rte_eth_dev *dev)
 		PMD_INIT_LOG(ERR, "HW configuration doesn't support SRIOV");
 		return -EINVAL;
 	}
+
+	i40e_pf_config_vf_rxq_number(dev);
+
 	/* Add the parameter init for LFC */
 	pf->fc_conf.pause_time = I40E_DEFAULT_PAUSE_TIME;
 	pf->fc_conf.high_water[I40E_MAX_TRAFFIC_CLASS] = I40E_DEFAULT_HIGH_WATER;
@@ -3992,7 +4056,6 @@ i40e_pf_parameter_init(struct rte_eth_dev *dev)
 	pf->max_num_vsi = hw->func_caps.num_vsis;
 	pf->lan_nb_qp_max = RTE_LIBRTE_I40E_QUEUE_NUM_PER_PF;
 	pf->vmdq_nb_qp_max = RTE_LIBRTE_I40E_QUEUE_NUM_PER_VM;
-	pf->vf_nb_qp_max = RTE_LIBRTE_I40E_QUEUE_NUM_PER_VF;
 
 	/* FDir queue/VSI allocation */
 	pf->fdir_qp_offset = 0;
@@ -4022,7 +4085,7 @@ i40e_pf_parameter_init(struct rte_eth_dev *dev)
 	pf->vf_qp_offset = pf->lan_qp_offset + pf->lan_nb_qps;
 	if (hw->func_caps.sr_iov_1_1 && pci_dev->max_vfs) {
 		pf->flags |= I40E_FLAG_SRIOV;
-		pf->vf_nb_qps = RTE_LIBRTE_I40E_QUEUE_NUM_PER_VF;
+		pf->vf_nb_qps = pf->vf_nb_qp_max;
 		pf->vf_num = pci_dev->max_vfs;
 		PMD_DRV_LOG(DEBUG,
 			"%u VF VSIs, %u queues per VF VSI, in total %u queues",
-- 
2.7.5