* [PATCH 1/1] net/ena: restructure the llq policy user setting
2024-06-06 13:32 [PATCH 0/1] net/ena: devargs api change shaibran
@ 2024-06-06 13:33 ` shaibran
0 siblings, 0 replies; 2+ messages in thread
From: shaibran @ 2024-06-06 13:33 UTC (permalink / raw)
To: ferruh.yigit; +Cc: dev, Shai Brandes
From: Shai Brandes <shaibran@amazon.com>
Replaced `enable_llq`, `normal_llq_hdr` and `large_llq_hdr`
devargs with a new shared devarg named `llq_policy` that
implements the same logic and accepts the following values:
0 - Disable LLQ.
Use with extreme caution as it leads to a huge performance
degradation on AWS instances from 6th generation onwards.
1 - Accept device recommended LLQ policy (Default).
Device can recommend normal or large LLQ policy.
2 - Enforce normal LLQ policy.
3 - Enforce large LLQ policy.
Required for packets with header that exceed 96 bytes on
AWS instances prior to 5th generation.
Signed-off-by: Shai Brandes <shaibran@amazon.com>
Reviewed-by: Amit Bernstein <amitbern@amazon.com>
---
doc/guides/nics/ena.rst | 25 ++----
doc/guides/rel_notes/release_24_07.rst | 8 ++
drivers/net/ena/ena_ethdev.c | 104 +++++++++----------------
drivers/net/ena/ena_ethdev.h | 3 -
4 files changed, 51 insertions(+), 89 deletions(-)
diff --git a/doc/guides/nics/ena.rst b/doc/guides/nics/ena.rst
index 2b105834a0..8f693ac3c9 100644
--- a/doc/guides/nics/ena.rst
+++ b/doc/guides/nics/ena.rst
@@ -107,15 +107,15 @@ Configuration
Runtime Configuration
^^^^^^^^^^^^^^^^^^^^^
- * **large_llq_hdr** (default 0)
+ * **llq_policy** (default 1)
- Enables or disables usage of large LLQ headers. This option will have
- effect only if the device also supports large LLQ headers. Otherwise, the
- default value will be used.
-
- * **normal_llq_hdr** (default 0)
-
- Enforce normal LLQ policy.
+ Controls whether use device recommended header policy or override it.
+ 0 - Disable LLQ.
+ **Use with extreme caution as it leads to a huge performance
+ degradation on AWS instances from 6th generation onwards.**
+ 1 - Accept device recommended LLQ policy (Default).
+ 2 - Enforce normal LLQ policy.
+ 3 - Enforce large LLQ policy.
* **miss_txc_to** (default 5)
@@ -126,15 +126,6 @@ Runtime Configuration
timer service. Setting this parameter to 0 disables this feature. Maximum
allowed value is 60 seconds.
- * **enable_llq** (default 1)
-
- Determines whenever the driver should use the LLQ (if it's available) or
- not.
-
- **NOTE: On the 6th generation AWS instances disabling LLQ may lead to a
- huge performance degradation. In general disabling LLQ is highly not
- recommended!**
-
* **control_poll_interval** (default 0)
Enable polling-based functionality of the admin queues,
diff --git a/doc/guides/rel_notes/release_24_07.rst b/doc/guides/rel_notes/release_24_07.rst
index e68a53d757..1fa678864d 100644
--- a/doc/guides/rel_notes/release_24_07.rst
+++ b/doc/guides/rel_notes/release_24_07.rst
@@ -73,6 +73,12 @@ New Features
``bpf_obj_get()`` for an xskmap pinned (by the AF_XDP DP) inside the
container.
+* **Updated Amazon ena (Elastic Network Adapter) net driver.**
+
+ * Modified the PMD API that controls the LLQ header policy.
+ Replaced ``enable_llq``, ``normal_llq_hdr`` and ``large_llq_hdr`` devargs
+ with a new shared devarg ``llq_policy`` that keeps the same logic.
+
* **Update Tap PMD driver.**
* Updated to support up to 8 queues when used by secondary process.
@@ -117,6 +123,8 @@ API Changes
This section is a comment. Do not overwrite or remove it.
Also, make sure to start the actual text at the margin.
=======================================================
+* drivers/net/ena: Removed ``enable_llq``, ``normal_llq_hdr`` and ``large_llq_hdr`` devargs
+ and replaced it with a new shared devarg ``llq_policy`` that keeps the same logic.
ABI Changes
diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index 66fc287faf..e3c2696ae1 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -81,18 +81,27 @@ struct ena_stats {
ENA_STAT_ENTRY(stat, srd)
/* Device arguments */
-#define ENA_DEVARG_LARGE_LLQ_HDR "large_llq_hdr"
-#define ENA_DEVARG_NORMAL_LLQ_HDR "normal_llq_hdr"
+
+/* Controls whether to disable LLQ, use device recommended header policy
+ * or overriding the device recommendation.
+ * 0 - Disable LLQ.
+ * Use with extreme caution as it leads to a huge performance
+ * degradation on AWS instances from 6th generation onwards.
+ * 1 - Accept device recommended LLQ policy (Default).
+ * Device can recommend normal or large LLQ policy.
+ * 2 - Enforce normal LLQ policy.
+ * 3 - Enforce large LLQ policy.
+ * Required for packets with header that exceed 96 bytes on
+ * AWS instances prior to 5th generation.
+ */
+ #define ENA_DEVARG_LLQ_POLICY "llq_policy"
+
+
/* Timeout in seconds after which a single uncompleted Tx packet should be
* considered as a missing.
*/
#define ENA_DEVARG_MISS_TXC_TO "miss_txc_to"
-/*
- * Controls whether LLQ should be used (if available). Enabled by default.
- * NOTE: It's highly not recommended to disable the LLQ, as it may lead to a
- * huge performance degradation on 6th generation AWS instances.
- */
-#define ENA_DEVARG_ENABLE_LLQ "enable_llq"
+
/*
* Controls the period of time (in milliseconds) between two consecutive inspections of
* the control queues when the driver is in poll mode and not using interrupts.
@@ -296,9 +305,9 @@ static int ena_xstats_get_by_id(struct rte_eth_dev *dev,
const uint64_t *ids,
uint64_t *values,
unsigned int n);
-static int ena_process_bool_devarg(const char *key,
- const char *value,
- void *opaque);
+static int ena_process_llq_policy_devarg(const char *key,
+ const char *value,
+ void *opaque);
static int ena_parse_devargs(struct ena_adapter *adapter,
struct rte_devargs *devargs);
static void ena_copy_customer_metrics(struct ena_adapter *adapter,
@@ -314,7 +323,6 @@ static int ena_rx_queue_intr_disable(struct rte_eth_dev *dev,
static int ena_configure_aenq(struct ena_adapter *adapter);
static int ena_mp_primary_handle(const struct rte_mp_msg *mp_msg,
const void *peer);
-static ena_llq_policy ena_define_llq_hdr_policy(struct ena_adapter *adapter);
static bool ena_use_large_llq_hdr(struct ena_adapter *adapter, uint8_t recommended_entry_size);
static const struct eth_dev_ops ena_dev_ops = {
@@ -2292,9 +2300,6 @@ static int eth_ena_dev_init(struct rte_eth_dev *eth_dev)
/* Assign default devargs values */
adapter->missing_tx_completion_to = ENA_TX_TIMEOUT;
- adapter->enable_llq = true;
- adapter->use_large_llq_hdr = false;
- adapter->use_normal_llq_hdr = false;
/* Get user bypass */
rc = ena_parse_devargs(adapter, pci_dev->device.devargs);
@@ -2302,7 +2307,6 @@ static int eth_ena_dev_init(struct rte_eth_dev *eth_dev)
PMD_INIT_LOG(CRIT, "Failed to parse devargs\n");
goto err;
}
- adapter->llq_header_policy = ena_define_llq_hdr_policy(adapter);
rc = ena_com_allocate_customer_metrics_buffer(ena_dev);
if (rc != 0) {
@@ -3736,44 +3740,29 @@ static int ena_process_uint_devarg(const char *key,
return 0;
}
-static int ena_process_bool_devarg(const char *key,
- const char *value,
- void *opaque)
+static int ena_process_llq_policy_devarg(const char *key, const char *value, void *opaque)
{
struct ena_adapter *adapter = opaque;
- bool bool_value;
+ uint32_t policy;
- /* Parse the value. */
- if (strcmp(value, "1") == 0) {
- bool_value = true;
- } else if (strcmp(value, "0") == 0) {
- bool_value = false;
+ policy = strtoul(value, NULL, DECIMAL_BASE);
+ if (policy < ENA_LLQ_POLICY_LAST) {
+ adapter->llq_header_policy = policy;
} else {
- PMD_INIT_LOG(ERR,
- "Invalid value: '%s' for key '%s'. Accepted: '0' or '1'\n",
- value, key);
+ PMD_INIT_LOG(ERR, "Invalid value: '%s' for key '%s'. valid [0-3]\n", value, key);
return -EINVAL;
}
-
- /* Now, assign it to the proper adapter field. */
- if (strcmp(key, ENA_DEVARG_LARGE_LLQ_HDR) == 0)
- adapter->use_large_llq_hdr = bool_value;
- else if (strcmp(key, ENA_DEVARG_NORMAL_LLQ_HDR) == 0)
- adapter->use_normal_llq_hdr = bool_value;
- else if (strcmp(key, ENA_DEVARG_ENABLE_LLQ) == 0)
- adapter->enable_llq = bool_value;
-
+ PMD_DRV_LOG(INFO,
+ "LLQ policy is %u [0 - disabled, 1 - device recommended, 2 - normal, 3 - large]\n",
+ adapter->llq_header_policy);
return 0;
}
-static int ena_parse_devargs(struct ena_adapter *adapter,
- struct rte_devargs *devargs)
+static int ena_parse_devargs(struct ena_adapter *adapter, struct rte_devargs *devargs)
{
static const char * const allowed_args[] = {
- ENA_DEVARG_LARGE_LLQ_HDR,
- ENA_DEVARG_NORMAL_LLQ_HDR,
+ ENA_DEVARG_LLQ_POLICY,
ENA_DEVARG_MISS_TXC_TO,
- ENA_DEVARG_ENABLE_LLQ,
ENA_DEVARG_CONTROL_PATH_POLL_INTERVAL,
NULL,
};
@@ -3785,27 +3774,17 @@ static int ena_parse_devargs(struct ena_adapter *adapter,
kvlist = rte_kvargs_parse(devargs->args, allowed_args);
if (kvlist == NULL) {
- PMD_INIT_LOG(ERR, "Invalid device arguments: %s\n",
- devargs->args);
+ PMD_INIT_LOG(ERR, "Invalid device arguments: %s\n", devargs->args);
return -EINVAL;
}
-
- rc = rte_kvargs_process(kvlist, ENA_DEVARG_LARGE_LLQ_HDR,
- ena_process_bool_devarg, adapter);
- if (rc != 0)
- goto exit;
- rc = rte_kvargs_process(kvlist, ENA_DEVARG_NORMAL_LLQ_HDR,
- ena_process_bool_devarg, adapter);
+ rc = rte_kvargs_process(kvlist, ENA_DEVARG_LLQ_POLICY,
+ ena_process_llq_policy_devarg, adapter);
if (rc != 0)
goto exit;
rc = rte_kvargs_process(kvlist, ENA_DEVARG_MISS_TXC_TO,
ena_process_uint_devarg, adapter);
if (rc != 0)
goto exit;
- rc = rte_kvargs_process(kvlist, ENA_DEVARG_ENABLE_LLQ,
- ena_process_bool_devarg, adapter);
- if (rc != 0)
- goto exit;
rc = rte_kvargs_process(kvlist, ENA_DEVARG_CONTROL_PATH_POLL_INTERVAL,
ena_process_uint_devarg, adapter);
if (rc != 0)
@@ -4029,9 +4008,7 @@ RTE_PMD_REGISTER_PCI(net_ena, rte_ena_pmd);
RTE_PMD_REGISTER_PCI_TABLE(net_ena, pci_id_ena_map);
RTE_PMD_REGISTER_KMOD_DEP(net_ena, "* igb_uio | uio_pci_generic | vfio-pci");
RTE_PMD_REGISTER_PARAM_STRING(net_ena,
- ENA_DEVARG_LARGE_LLQ_HDR "=<0|1> "
- ENA_DEVARG_NORMAL_LLQ_HDR "=<0|1> "
- ENA_DEVARG_ENABLE_LLQ "=<0|1> "
+ ENA_DEVARG_LLQ_POLICY "=<0|1|2|3> "
ENA_DEVARG_MISS_TXC_TO "=<uint>"
ENA_DEVARG_CONTROL_PATH_POLL_INTERVAL "=<0-1000>");
RTE_LOG_REGISTER_SUFFIX(ena_logtype_init, init, NOTICE);
@@ -4219,17 +4196,6 @@ ena_mp_primary_handle(const struct rte_mp_msg *mp_msg, const void *peer)
return rte_mp_reply(&mp_rsp, peer);
}
-static ena_llq_policy ena_define_llq_hdr_policy(struct ena_adapter *adapter)
-{
- if (!adapter->enable_llq)
- return ENA_LLQ_POLICY_DISABLED;
- if (adapter->use_large_llq_hdr)
- return ENA_LLQ_POLICY_LARGE;
- if (adapter->use_normal_llq_hdr)
- return ENA_LLQ_POLICY_NORMAL;
- return ENA_LLQ_POLICY_RECOMMENDED;
-}
-
static bool ena_use_large_llq_hdr(struct ena_adapter *adapter, uint8_t recommended_entry_size)
{
if (adapter->llq_header_policy == ENA_LLQ_POLICY_LARGE) {
diff --git a/drivers/net/ena/ena_ethdev.h b/drivers/net/ena/ena_ethdev.h
index 7d82d222ce..fe7d4a2d65 100644
--- a/drivers/net/ena/ena_ethdev.h
+++ b/drivers/net/ena/ena_ethdev.h
@@ -337,9 +337,6 @@ struct ena_adapter {
uint32_t active_aenq_groups;
bool trigger_reset;
- bool enable_llq;
- bool use_large_llq_hdr;
- bool use_normal_llq_hdr;
ena_llq_policy llq_header_policy;
uint32_t last_tx_comp_qid;
--
2.17.1
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