[dpdk-dev] [PATCH v2] net/tap: report on supported RSS hash functions
Ophir Munk
ophirmu at mellanox.com
Tue May 8 19:07:35 CEST 2018
Report on TAP supported RSS functions as part of dev_infos_get
callback: ETH_RSS_IP, ETH_RSS_UDP and ETH_RSS_TCP.
Known limitation: TAP supports all of the above hash functions together
and not in partial combinations.
Previous to this commit RSS support was reported as none. Since the
introduction of [1] it is required that all RSS configurations will be
verified.
[1] commit 8863a1fbfc66 ("ethdev: add supported hash function check")
Signed-off-by: Ophir Munk <ophirmu at mellanox.com>
---
v1:
Initial release
v2:
fix checkpach warnings
doc/guides/nics/tap.rst | 5 +++++
drivers/net/tap/rte_eth_tap.c | 8 ++++++++
drivers/net/tap/tap_bpf_program.c | 2 +-
drivers/net/tap/tap_rss.h | 3 +++
4 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/doc/guides/nics/tap.rst b/doc/guides/nics/tap.rst
index dca64c9..2714868 100644
--- a/doc/guides/nics/tap.rst
+++ b/doc/guides/nics/tap.rst
@@ -258,6 +258,11 @@ Please refer to ``iproute2`` package file ``lib/bpf.c`` function
An example utility for eBPF instruction generation in the format of C arrays will
be added in next releases
+TAP reports on supported RSS functions as part of dev_infos_get callback:
+``ETH_RSS_IP``, ``ETH_RSS_UDP`` and ``ETH_RSS_TCP``.
+**Known limitation:** TAP supports all of the above hash functions together
+and not in partial combinations.
+
Systems supporting flow API
---------------------------
diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index c535418..9ef511e 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -36,6 +36,7 @@
#include <linux/if_ether.h>
#include <fcntl.h>
+#include <tap_rss.h>
#include <rte_eth_tap.h>
#include <tap_flow.h>
#include <tap_netlink.h>
@@ -875,6 +876,13 @@ tap_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
dev_info->tx_queue_offload_capa = tap_tx_offload_get_queue_capa();
dev_info->tx_offload_capa = tap_tx_offload_get_port_capa() |
dev_info->tx_queue_offload_capa;
+ dev_info->hash_key_size = TAP_RSS_HASH_KEY_SIZE;
+ /*
+ * limitation: TAP suppors all of the following hash
+ * functions together and not in partial combinations
+ */
+ dev_info->flow_type_rss_offloads =
+ ETH_RSS_IP | ETH_RSS_UDP | ETH_RSS_TCP;
}
static int
diff --git a/drivers/net/tap/tap_bpf_program.c b/drivers/net/tap/tap_bpf_program.c
index dabbf7c..1cb7382 100644
--- a/drivers/net/tap/tap_bpf_program.c
+++ b/drivers/net/tap/tap_bpf_program.c
@@ -84,7 +84,7 @@ struct ipv6_l3_l4_tuple {
__u16 sport;
} __attribute__((packed));
-static const __u8 def_rss_key[] = {
+static const __u8 def_rss_key[TAP_RSS_HASH_KEY_SIZE] = {
0xd1, 0x81, 0xc6, 0x2c,
0xf7, 0xf4, 0xdb, 0x5b,
0x19, 0x83, 0xa2, 0xfc,
diff --git a/drivers/net/tap/tap_rss.h b/drivers/net/tap/tap_rss.h
index 4ebb653..bd6b97b 100644
--- a/drivers/net/tap/tap_rss.h
+++ b/drivers/net/tap/tap_rss.h
@@ -9,6 +9,9 @@
#define TAP_MAX_QUEUES 16
#endif
+/* Fixed RSS hash key size in bytes. */
+#define TAP_RSS_HASH_KEY_SIZE 40
+
/* hashed fields for RSS */
enum hash_field {
HASH_FIELD_IPV4_L3, /* IPv4 src/dst addr */
--
2.7.4
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