[dpdk-dev] [PATCH v2 6/6] examples/flow_filtering: utilize shared RSS action
Andrey Vesnovaty
andreyv at mellanox.com
Wed Jul 8 23:39:45 CEST 2020
This commit gives very first shared RSS action usage example and
demonstrates shared action capability for in-place update.
First application creates shared action during initialization phase.
Later on the flow object created by application uses previously created
shared RSS action with 1 queue configured instead of queue action in
original application.
On each RX queue burst shared RSS action reconfigured via
rte_flow_shared_action_update() API to switch queue 0 to 1 & 1 to 0.
User supposed to observe consistent queue switches on each packet burst.
Signed-off-by: Andrey Vesnovaty <andreyv at mellanox.com>
---
doc/guides/sample_app_ug/flow_filtering.rst | 62 +++++++++++++++++----
examples/flow_filtering/flow_blocks.c | 30 +++++-----
examples/flow_filtering/main.c | 41 +++++++++++++-
3 files changed, 105 insertions(+), 28 deletions(-)
diff --git a/doc/guides/sample_app_ug/flow_filtering.rst b/doc/guides/sample_app_ug/flow_filtering.rst
index 5e5a6cd8a0..cfe9334717 100644
--- a/doc/guides/sample_app_ug/flow_filtering.rst
+++ b/doc/guides/sample_app_ug/flow_filtering.rst
@@ -106,7 +106,7 @@ following code:
.. code-block:: c
/* create flow for send packet with */
- flow = generate_ipv4_flow(port_id, selected_queue,
+ flow = generate_ipv4_flow(port_id, shared_action,
SRC_IP, EMPTY_MASK,
DEST_IP, FULL_MASK, &error);
if (!flow) {
@@ -242,7 +242,7 @@ The Ethernet port is configured with default settings using the
rxq_conf = dev_info.default_rxconf;
rxq_conf.offloads = port_conf.rxmode.offloads;
-For this example we are configuring number of rx and tx queues that are connected
+For this example we are configuring 2 rx and 2 tx queues that are connected
to a single port.
.. code-block:: c
@@ -270,13 +270,22 @@ to a single port.
}
}
+Before we create the flow we create shared action in order to send it as
+actions argument when creating a flow. The action is single queue RSS action
+similar to action queue with the only difference that shared RSS action
+provides update capability after action creation.
+
+.. code-block:: c
+
+ shared_action = rte_flow_shared_action_create(port_id, &action, &error);
+
In the next step we create and apply the flow rule. which is to send packets
with destination ip equals to 192.168.1.1 to queue number 1. The detail
explanation of the ``generate_ipv4_flow()`` appears later in this document:
.. code-block:: c
- flow = generate_ipv4_flow(port_id, selected_queue,
+ flow = generate_ipv4_flow(port_id, shared_action,
SRC_IP, EMPTY_MASK,
DEST_IP, FULL_MASK, &error);
@@ -339,6 +348,21 @@ looks like the following:
printf("\n");
rte_pktmbuf_free(m);
}
+ if (rss_queue[0] == 0) {
+ printf(">>> switching queue 0 -> 1\n");
+ rss_queue[0] = 1;
+ } else {
+ printf(">>> switching queue 1 -> 0\n");
+ rss_queue[0] = 0;
+ }
+ ret = rte_flow_shared_action_update
+ (port_id, shared_action, &action,
+ &error);
+ if (ret)
+ rte_exit(EXIT_FAILURE,
+ ":: error: RSS action update "
+ "failed: %s\n",
+ rte_strerror(-ret));
}
}
}
@@ -348,6 +372,8 @@ looks like the following:
rte_eth_dev_close(port_id);
}
+On each loop eteration Rx queue switched using
+``rte_flow_shared_action_update()`` API.
The main work of the application is reading the packets from all
queues and printing for each packet the destination queue:
@@ -365,6 +391,21 @@ queues and printing for each packet the destination queue:
printf(" - queue=0x%x", (unsigned int)i);
printf("\n");
rte_pktmbuf_free(m);
+ if (rss_queue[0] == 0) {
+ printf(">>> switching queue 0 -> 1\n");
+ rss_queue[0] = 1;
+ } else {
+ printf(">>> switching queue 1 -> 0\n");
+ rss_queue[0] = 0;
+ }
+ ret = rte_flow_shared_action_update
+ (port_id, shared_action, &action,
+ &error);
+ if (ret)
+ rte_exit(EXIT_FAILURE,
+ ":: error: RSS action update "
+ "failed: %s\n",
+ rte_strerror(-ret));
}
}
}
@@ -378,13 +419,15 @@ The forwarding loop can be interrupted and the application closed using
The generate_ipv4_flow function
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
The generate_ipv4_flow function is responsible for creating the flow rule.
This function is located in the ``flow_blocks.c`` file.
.. code-block:: c
static struct rte_flow *
- generate_ipv4_flow(uint8_t port_id, uint16_t rx_q,
+ generate_ipv4_flow(uint8_t port_id,
+ cstructrte_flow_shared_action *shared_action,
uint32_t src_ip, uint32_t src_mask,
uint32_t dest_ip, uint32_t dest_mask,
struct rte_flow_error *error)
@@ -393,7 +436,6 @@ This function is located in the ``flow_blocks.c`` file.
struct rte_flow_item pattern[MAX_PATTERN_NUM];
struct rte_flow_action action[MAX_ACTION_NUM];
struct rte_flow *flow = NULL;
- struct rte_flow_action_queue queue = { .index = rx_q };
struct rte_flow_item_ipv4 ip_spec;
struct rte_flow_item_ipv4 ip_mask;
@@ -411,8 +453,8 @@ This function is located in the ``flow_blocks.c`` file.
* create the action sequence.
* one action only, move packet to queue
*/
- action[0].type = RTE_FLOW_ACTION_TYPE_QUEUE;
- action[0].conf = &queue;
+ action[0].type = RTE_FLOW_ACTION_TYPE_SHARED;
+ action[0].conf = shared_action;
action[1].type = RTE_FLOW_ACTION_TYPE_END;
/*
@@ -468,12 +510,12 @@ The following part create the flow attributes, in our case ingress.
attr.ingress = 1;
The third part defines the action to be taken when a packet matches
-the rule. In this case send the packet to queue.
+the rule. In this case send the packet to single RSS queue.
.. code-block:: c
- action[0].type = RTE_FLOW_ACTION_TYPE_QUEUE;
- action[0].conf = &queue;
+ action[0].type = RTE_FLOW_ACTION_TYPE_SHARED;
+ action[0].conf = shared_action;
action[1].type = RTE_FLOW_ACTION_TYPE_END;
The fourth part is responsible for creating the pattern and is built from
diff --git a/examples/flow_filtering/flow_blocks.c b/examples/flow_filtering/flow_blocks.c
index 575d792810..99bfed3172 100644
--- a/examples/flow_filtering/flow_blocks.c
+++ b/examples/flow_filtering/flow_blocks.c
@@ -6,11 +6,11 @@
#define MAX_ACTION_NUM 2
struct rte_flow *
-generate_ipv4_flow(uint16_t port_id, uint16_t rx_q,
- uint32_t src_ip, uint32_t src_mask,
- uint32_t dest_ip, uint32_t dest_mask,
- struct rte_flow_error *error);
-
+generate_ipv4_flow(uint16_t port_id,
+ struct rte_flow_shared_action *shared_action,
+ uint32_t src_ip, uint32_t src_mask,
+ uint32_t dest_ip, uint32_t dest_mask,
+ struct rte_flow_error *error);
/**
* create a flow rule that sends packets with matching src and dest ip
@@ -18,8 +18,8 @@ generate_ipv4_flow(uint16_t port_id, uint16_t rx_q,
*
* @param port_id
* The selected port.
- * @param rx_q
- * The selected target queue.
+ * @param shared_action
+ * The shared RSS action with single queue
* @param src_ip
* The src ip value to match the input packet.
* @param src_mask
@@ -35,16 +35,16 @@ generate_ipv4_flow(uint16_t port_id, uint16_t rx_q,
* A flow if the rule could be created else return NULL.
*/
struct rte_flow *
-generate_ipv4_flow(uint16_t port_id, uint16_t rx_q,
- uint32_t src_ip, uint32_t src_mask,
- uint32_t dest_ip, uint32_t dest_mask,
- struct rte_flow_error *error)
+generate_ipv4_flow(uint16_t port_id,
+ struct rte_flow_shared_action *shared_action,
+ uint32_t src_ip, uint32_t src_mask,
+ uint32_t dest_ip, uint32_t dest_mask,
+ struct rte_flow_error *error)
{
struct rte_flow_attr attr;
struct rte_flow_item pattern[MAX_PATTERN_NUM];
struct rte_flow_action action[MAX_ACTION_NUM];
struct rte_flow *flow = NULL;
- struct rte_flow_action_queue queue = { .index = rx_q };
struct rte_flow_item_ipv4 ip_spec;
struct rte_flow_item_ipv4 ip_mask;
int res;
@@ -61,10 +61,10 @@ generate_ipv4_flow(uint16_t port_id, uint16_t rx_q,
/*
* create the action sequence.
- * one action only, move packet to queue
+ * one action only, move packet to shared RSS queue
*/
- action[0].type = RTE_FLOW_ACTION_TYPE_QUEUE;
- action[0].conf = &queue;
+ action[0].type = RTE_FLOW_ACTION_TYPE_SHARED;
+ action[0].conf = shared_action;
action[1].type = RTE_FLOW_ACTION_TYPE_END;
/*
diff --git a/examples/flow_filtering/main.c b/examples/flow_filtering/main.c
index cc9e7e7808..d6b18d95fc 100644
--- a/examples/flow_filtering/main.c
+++ b/examples/flow_filtering/main.c
@@ -32,8 +32,7 @@
static volatile bool force_quit;
static uint16_t port_id;
-static uint16_t nr_queues = 5;
-static uint8_t selected_queue = 1;
+static uint16_t nr_queues = 2;
struct rte_mempool *mbuf_pool;
struct rte_flow *flow;
@@ -42,6 +41,24 @@ struct rte_flow *flow;
#define FULL_MASK 0xffffffff /* full mask */
#define EMPTY_MASK 0x0 /* empty mask */
+struct rte_flow_shared_action *shared_action;
+uint16_t rss_queue[1] = {0};
+
+struct rte_flow_action_rss action_rss = {
+ .func = RTE_ETH_HASH_FUNCTION_DEFAULT,
+ .level = 0,
+ .types = 0,
+ .key_len = 0,
+ .key = NULL,
+ .queue = rss_queue,
+ .queue_num = 1,
+};
+
+struct rte_flow_action action = {
+ .type = RTE_FLOW_ACTION_TYPE_RSS,
+ .conf = &action_rss,
+};
+
#include "flow_blocks.c"
static inline void
@@ -61,6 +78,7 @@ main_loop(void)
uint16_t nb_rx;
uint16_t i;
uint16_t j;
+ int ret;
while (!force_quit) {
for (i = 0; i < nr_queues; i++) {
@@ -82,6 +100,21 @@ main_loop(void)
rte_pktmbuf_free(m);
}
+ if (rss_queue[0] == 0) {
+ printf(">>> switching queue 0 -> 1\n");
+ rss_queue[0] = 1;
+ } else {
+ printf(">>> switching queue 1 -> 0\n");
+ rss_queue[0] = 0;
+ }
+ ret = rte_flow_shared_action_update
+ (port_id, shared_action, &action,
+ &error);
+ if (ret)
+ rte_exit(EXIT_FAILURE,
+ ":: error: RSS action update "
+ "failed: %s\n",
+ rte_strerror(-ret));
}
}
}
@@ -243,8 +276,10 @@ main(int argc, char **argv)
init_port();
+ shared_action = rte_flow_shared_action_create(port_id, &action, &error);
+
/* create flow for send packet with */
- flow = generate_ipv4_flow(port_id, selected_queue,
+ flow = generate_ipv4_flow(port_id, shared_action,
SRC_IP, EMPTY_MASK,
DEST_IP, FULL_MASK, &error);
if (!flow) {
--
2.26.2
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