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mlx5: adapt indirection table size depending on Rx queues number

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Use the maximum size of the indirection table when the number of requested
RX queues is not a power of two, this help to improve RSS balancing.

A message informs users that balancing is not optimal in such cases.

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
This commit is contained in:
Nelio Laranjeiro 2015-10-30 19:55:08 +01:00 committed by Thomas Monjalon
parent a76133214d
commit 95e16ef325
4 changed files with 27 additions and 8 deletions
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10
drivers/net/mlx5/mlx5.c
View File

@ -299,7 +299,9 @@ mlx5_pci_devinit(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
struct ether_addr mac;
#ifdef HAVE_EXP_QUERY_DEVICE
exp_device_attr.comp_mask = IBV_EXP_DEVICE_ATTR_EXP_CAP_FLAGS;
exp_device_attr.comp_mask =
IBV_EXP_DEVICE_ATTR_EXP_CAP_FLAGS |
IBV_EXP_DEVICE_ATTR_RX_HASH;
#endif /* HAVE_EXP_QUERY_DEVICE */
DEBUG("using port %u (%08" PRIx32 ")", port, test);
@ -363,6 +365,12 @@ mlx5_pci_devinit(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
DEBUG("L2 tunnel checksum offloads are %ssupported",
(priv->hw_csum_l2tun ? "" : "not "));
priv->ind_table_max_size = exp_device_attr.rx_hash_caps.max_rwq_indirection_table_size;
DEBUG("maximum RX indirection table size is %u",
priv->ind_table_max_size);
#else /* HAVE_EXP_QUERY_DEVICE */
priv->ind_table_max_size = RSS_INDIRECTION_TABLE_SIZE;
#endif /* HAVE_EXP_QUERY_DEVICE */
priv->vf = vf;

1
drivers/net/mlx5/mlx5.h
View File

@ -109,6 +109,7 @@ struct priv {
/* Indirection tables referencing all RX WQs. */
struct ibv_exp_rwq_ind_table *(*ind_tables)[];
unsigned int ind_tables_n; /* Number of indirection tables. */
unsigned int ind_table_max_size; /* Maximum indirection table size. */
/* Hash RX QPs feeding the indirection table. */
struct hash_rxq (*hash_rxqs)[];
unsigned int hash_rxqs_n; /* Hash RX QPs array size. */

3
drivers/net/mlx5/mlx5_defs.h
View File

@ -46,6 +46,9 @@
/* Request send completion once in every 64 sends, might be less. */
#define MLX5_PMD_TX_PER_COMP_REQ 64
/* RSS Indirection table size. */
#define RSS_INDIRECTION_TABLE_SIZE 128
/* Maximum number of Scatter/Gather Elements per Work Request. */
#ifndef MLX5_PMD_SGE_WR_N
#define MLX5_PMD_SGE_WR_N 4

21
drivers/net/mlx5/mlx5_rxq.c
View File

@ -224,7 +224,13 @@ priv_make_ind_table_init(struct priv *priv,
int
priv_create_hash_rxqs(struct priv *priv)
{
unsigned int wqs_n = (1 << log2above(priv->rxqs_n));
/* If the requested number of WQs is not a power of two, use the
* maximum indirection table size for better balancing.
* The result is always rounded to the next power of two. */
unsigned int wqs_n =
(1 << log2above((priv->rxqs_n & (priv->rxqs_n - 1)) ?
priv->ind_table_max_size :
priv->rxqs_n));
struct ibv_exp_wq *wqs[wqs_n];
struct ind_table_init ind_table_init[IND_TABLE_INIT_N];
unsigned int ind_tables_n =
@ -251,16 +257,17 @@ priv_create_hash_rxqs(struct priv *priv)
" indirection table cannot be created");
return EINVAL;
}
if (wqs_n < priv->rxqs_n) {
if ((wqs_n < priv->rxqs_n) || (wqs_n > priv->ind_table_max_size)) {
ERROR("cannot handle this many RX queues (%u)", priv->rxqs_n);
err = ERANGE;
goto error;
}
if (wqs_n != priv->rxqs_n)
WARN("%u RX queues are configured, consider rounding this"
" number to the next power of two (%u) for optimal"
" performance",
priv->rxqs_n, wqs_n);
if (wqs_n != priv->rxqs_n) {
INFO("%u RX queues are configured, consider rounding this"
" number to the next power of two for better balancing",
priv->rxqs_n);
DEBUG("indirection table extended to assume %u WQs", wqs_n);
}
/* When the number of RX queues is not a power of two, the remaining
* table entries are padded with reused WQs and hashes are not spread
* uniformly. */