On Thu, Jul 9, 2020 at 3:09 AM Andrey Vesnovaty <andr...@mellanox.com> wrote:
>
> 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.
What if PMD does not support a shared context, Then this application
fails to run?
if so, have a mode or probe the capability(if capability present then
switches to new mode else fall back to old mode) before changing the
application behavior.
> 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 <andr...@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
>
