diff mbox series

[v8,net-next,7/7] net: ena: Advertise TX push support

Message ID 20230323195923.1731790-8-shayagr@amazon.com (mailing list archive)
State Changes Requested
Delegated to: Netdev Maintainers
Headers show
Series Add tx push buf len param to ethtool | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 18 this patch: 18
netdev/cc_maintainers success CCed 11 of 11 maintainers
netdev/build_clang success Errors and warnings before: 18 this patch: 18
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 18 this patch: 18
netdev/checkpatch warning CHECK: Unnecessary parentheses around 'adapter->ena_dev->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV' WARNING: line length of 81 exceeds 80 columns WARNING: line length of 86 exceeds 80 columns
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Shay Agroskin March 23, 2023, 7:59 p.m. UTC 
LLQ is auto enabled by the device and disabling it isn't supported on
new ENA generations while on old ones causes sub-optimal performance.

This patch adds advertisement of push-mode when LLQ mode is used, but
rejects an attempt to modify it.

Reviewed-by: Michal Kubiak <michal.kubiak@intel.com>
Signed-off-by: Shay Agroskin <shayagr@amazon.com>
---
 drivers/net/ethernet/amazon/ena/ena_ethtool.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/amazon/ena/ena_ethtool.c b/drivers/net/ethernet/amazon/ena/ena_ethtool.c
index de7ec02d8c09..d671df4b76bc 100644
--- a/drivers/net/ethernet/amazon/ena/ena_ethtool.c
+++ b/drivers/net/ethernet/amazon/ena/ena_ethtool.c
@@ -479,12 +479,14 @@  static void ena_get_ringparam(struct net_device *netdev,
 	if (adapter->ena_dev->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) {
 		bool large_llq_supported = adapter->large_llq_header_supported;
 
+		kernel_ring->tx_push = true;
 		kernel_ring->tx_push_buf_len = adapter->ena_dev->tx_max_header_size;
 		if (large_llq_supported)
 			kernel_ring->tx_push_buf_max_len = ENA_LLQ_LARGE_HEADER;
 		else
 			kernel_ring->tx_push_buf_max_len = ENA_LLQ_HEADER;
 	} else {
+		kernel_ring->tx_push = false;
 		kernel_ring->tx_push_buf_max_len = 0;
 		kernel_ring->tx_push_buf_len = 0;
 	}
@@ -516,6 +518,12 @@  static int ena_set_ringparam(struct net_device *netdev,
 	/* This value is ignored if LLQ is not supported */
 	new_tx_push_buf_len = adapter->ena_dev->tx_max_header_size;
 
+	if ((adapter->ena_dev->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) !=
+	    kernel_ring->tx_push) {
+		NL_SET_ERR_MSG_MOD(extack, "Push mode state cannot be modified");
+		return -EINVAL;
+	}
+
 	/* Validate that the push buffer is supported on the underlying device */
 	if (kernel_ring->tx_push_buf_len) {
 		enum ena_admin_placement_policy_type placement;
@@ -957,7 +965,8 @@  static int ena_set_tunable(struct net_device *netdev,
 static const struct ethtool_ops ena_ethtool_ops = {
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
 				     ETHTOOL_COALESCE_USE_ADAPTIVE_RX,
-	.supported_ring_params	= ETHTOOL_RING_USE_TX_PUSH_BUF_LEN,
+	.supported_ring_params	= ETHTOOL_RING_USE_TX_PUSH_BUF_LEN |
+				  ETHTOOL_RING_USE_TX_PUSH,
 	.get_link_ksettings	= ena_get_link_ksettings,
 	.get_drvinfo		= ena_get_drvinfo,
 	.get_msglevel		= ena_get_msglevel,