[dpdk-dev] [PATCH v2 5/8] net/sfc: process RSS settings on Rx configure step

[Andrew Rybchenko <arybchenko@solarflare.com>]

From: Ivan Malov <ivan.malov@oktetlabs.ru>

One may submit advanced RSS settings as part of
rte_eth_conf to customise RSS configuration from
the very beginning. Currently the driver does not
check that piece of settings and proceeds with
default choices for RSS hash functions and RSS key.

This patch implements the required processing.

Fixes: 4ec1fc3ba881 ("net/sfc: add basic stubs for RSS support on driver attach")
Cc: stable@dpdk.org

Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
---
 drivers/net/sfc/sfc_rx.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/drivers/net/sfc/sfc_rx.c b/drivers/net/sfc/sfc_rx.c
index 734ce24..fca3931 100644
--- a/drivers/net/sfc/sfc_rx.c
+++ b/drivers/net/sfc/sfc_rx.c
@@ -1189,6 +1189,41 @@ sfc_efx_to_rte_hash_type(efx_rx_hash_type_t efx_hash_types)
 
 #if EFSYS_OPT_RX_SCALE
 static int
+sfc_rx_process_adv_conf_rss(struct sfc_adapter *sa,
+			    struct rte_eth_rss_conf *conf)
+{
+	efx_rx_hash_type_t efx_hash_types = sa->rss_hash_types;
+
+	if (sa->rss_support != EFX_RX_SCALE_EXCLUSIVE) {
+		if ((conf->rss_hf != 0 && conf->rss_hf != SFC_RSS_OFFLOADS) ||
+		    conf->rss_key != NULL)
+			return EINVAL;
+	}
+
+	if (conf->rss_hf != 0) {
+		if ((conf->rss_hf & ~SFC_RSS_OFFLOADS) != 0) {
+			sfc_err(sa, "unsupported hash functions requested");
+			return EINVAL;
+		}
+
+		efx_hash_types = sfc_rte_to_efx_hash_type(conf->rss_hf);
+	}
+
+	if (conf->rss_key != NULL) {
+		if (conf->rss_key_len != sizeof(sa->rss_key)) {
+			sfc_err(sa, "RSS key size is wrong (should be %lu)",
+				sizeof(sa->rss_key));
+			return EINVAL;
+		}
+		rte_memcpy(sa->rss_key, conf->rss_key, sizeof(sa->rss_key));
+	}
+
+	sa->rss_hash_types = efx_hash_types;
+
+	return 0;
+}
+
+static int
 sfc_rx_rss_config(struct sfc_adapter *sa)
 {
 	int rc = 0;
@@ -1416,16 +1451,23 @@ sfc_rx_configure(struct sfc_adapter *sa)
 			   MIN(sa->rxq_count, EFX_MAXRSS) : 0;
 
 	if (sa->rss_channels > 0) {
+		struct rte_eth_rss_conf *adv_conf_rss;
 		unsigned int sw_index;
 
 		for (sw_index = 0; sw_index < EFX_RSS_TBL_SIZE; ++sw_index)
 			sa->rss_tbl[sw_index] = sw_index % sa->rss_channels;
+
+		adv_conf_rss = &dev_conf->rx_adv_conf.rss_conf;
+		rc = sfc_rx_process_adv_conf_rss(sa, adv_conf_rss);
+		if (rc != 0)
+			goto fail_rx_process_adv_conf_rss;
 	}
 #endif
 
 done:
 	return 0;
 
+fail_rx_process_adv_conf_rss:
 fail_rx_qinit_info:
 fail_rxqs_realloc:
 fail_rxqs_alloc:
-- 
2.7.4