[dpdk-dev] [PATCH v6 3/8] i40e: support of setting hash lookup table size

[Helin Zhang <helin.zhang@intel.com>]

Add support of setting hash lookup table size according
to the hardawre capability.

Signed-off-by: Helin Zhang <helin.zhang@intel.com>
---
 lib/librte_ether/rte_ethdev.h     |  9 ++++++++-
 lib/librte_pmd_i40e/i40e_ethdev.c | 14 +++++++++++++-
 lib/librte_pmd_i40e/i40e_ethdev.h |  1 +
 3 files changed, 22 insertions(+), 2 deletions(-)

v5 changes:
* Reworked the annotations of macros of RETA sizes.

diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index c29525b..2c8f129 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -443,9 +443,16 @@ struct rte_eth_rss_conf {
 		ETH_RSS_FRAG_IPV6 | \
 		ETH_RSS_L2_PAYLOAD)
 
-/* Definitions used for redirection table entry size */
+/*
+ * Definitions used for redirection table entry size.
+ * Some RSS RETA sizes may not be supported by some drivers, check the
+ * documentation or the description of relevant functions for more details.
+ */
 #define ETH_RSS_RETA_NUM_ENTRIES 128
 #define ETH_RSS_RETA_MAX_QUEUE   16
+#define ETH_RSS_RETA_SIZE_64  64
+#define ETH_RSS_RETA_SIZE_128 128
+#define ETH_RSS_RETA_SIZE_512 512
 
 /* Definitions used for VMDQ and DCB functionality */
 #define ETH_VMDQ_MAX_VLAN_FILTERS   64 /**< Maximum nb. of VMDQ vlan filters. */
diff --git a/lib/librte_pmd_i40e/i40e_ethdev.c b/lib/librte_pmd_i40e/i40e_ethdev.c
index 5074262..d90718e 100644
--- a/lib/librte_pmd_i40e/i40e_ethdev.c
+++ b/lib/librte_pmd_i40e/i40e_ethdev.c
@@ -3195,7 +3195,19 @@ i40e_pf_setup(struct i40e_pf *pf)
 
 	/* Configure filter control */
 	memset(&settings, 0, sizeof(settings));
-	settings.hash_lut_size = I40E_HASH_LUT_SIZE_128;
+	if (hw->func_caps.rss_table_size == ETH_RSS_RETA_SIZE_128)
+		settings.hash_lut_size = I40E_HASH_LUT_SIZE_128;
+	else if (hw->func_caps.rss_table_size == ETH_RSS_RETA_SIZE_512)
+		settings.hash_lut_size = I40E_HASH_LUT_SIZE_512;
+	else {
+		PMD_DRV_LOG(ERR, "Hash lookup table size (%u) not supported\n",
+						hw->func_caps.rss_table_size);
+		return I40E_ERR_PARAM;
+	}
+	PMD_DRV_LOG(INFO, "Hardware capability of hash lookup table "
+			"size: %u\n", hw->func_caps.rss_table_size);
+	pf->hash_lut_size = hw->func_caps.rss_table_size;
+
 	/* Enable ethtype and macvlan filters */
 	settings.enable_ethtype = TRUE;
 	settings.enable_macvlan = TRUE;
diff --git a/lib/librte_pmd_i40e/i40e_ethdev.h b/lib/librte_pmd_i40e/i40e_ethdev.h
index 96361c2..c7ad384 100644
--- a/lib/librte_pmd_i40e/i40e_ethdev.h
+++ b/lib/librte_pmd_i40e/i40e_ethdev.h
@@ -270,6 +270,7 @@ struct i40e_pf {
 	uint16_t vmdq_nb_qps; /* The number of queue pairs of VMDq */
 	uint16_t vf_nb_qps; /* The number of queue pairs of VF */
 	uint16_t fdir_nb_qps; /* The number of queue pairs of Flow Director */
+	uint16_t hash_lut_size; /* The size of hash lookup table */
 
 	/* store VXLAN UDP ports */
 	uint16_t vxlan_ports[I40E_MAX_PF_UDP_OFFLOAD_PORTS];
-- 
1.8.1.4