diff options
| author | Arthur Kiyanovski <akiyano@amazon.com> | 2020-07-21 16:38:11 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-07-22 01:59:04 +0300 |
| commit | 0e3a3f6dacf01cbad9ecc26149ffe8cda3137540 (patch) | |
| tree | bc85c254b30af9da6b6438e87ed33e2bf1f11183 /drivers/net/ethernet/amazon/ena/ena_com.c | |
| parent | c29efeae37077f4bcb2ecd710fc66ca72c43ec79 (diff) | |
| download | linux-0e3a3f6dacf01cbad9ecc26149ffe8cda3137540.tar.xz | |
net: ena: support new LLQ acceleration mode
New devices add a new hardware acceleration engine, which adds some
restrictions to the driver.
Metadata descriptor must be present for each packet and the maximum
burst size between two doorbells is now limited to a number
advertised by the device.
This patch adds:
1. A handshake protocol between the driver and the device, so the
device will enable the accelerated queues only when both sides
support it.
2. The driver support for the new acceleration engine:
2.1. Send metadata descriptor for each Tx packet.
2.2. Limit the number of packets sent between doorbells.(*)
(*) A previous driver implementation of this feature was comitted in
commit 05d62ca218f8 ("net: ena: add handling of llq max tx burst size")
however the design of the interface between the driver and device
changed since then. This change is reflected in this commit.
Signed-off-by: Netanel Belgazal <netanel@amazon.com>
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/amazon/ena/ena_com.c')
| -rw-r--r-- | drivers/net/ethernet/amazon/ena/ena_com.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c index 432f143559a1..435bf05a853c 100644 --- a/drivers/net/ethernet/amazon/ena/ena_com.c +++ b/drivers/net/ethernet/amazon/ena/ena_com.c @@ -403,6 +403,8 @@ static int ena_com_init_io_sq(struct ena_com_dev *ena_dev, 0x0, io_sq->llq_info.desc_list_entry_size); io_sq->llq_buf_ctrl.descs_left_in_line = io_sq->llq_info.descs_num_before_header; + io_sq->disable_meta_caching = + io_sq->llq_info.disable_meta_caching; if (io_sq->llq_info.max_entries_in_tx_burst > 0) io_sq->entries_in_tx_burst_left = @@ -626,6 +628,10 @@ static int ena_com_set_llq(struct ena_com_dev *ena_dev) cmd.u.llq.desc_num_before_header_enabled = llq_info->descs_num_before_header; cmd.u.llq.descriptors_stride_ctrl_enabled = llq_info->desc_stride_ctrl; + cmd.u.llq.accel_mode.u.set.enabled_flags = + BIT(ENA_ADMIN_DISABLE_META_CACHING) | + BIT(ENA_ADMIN_LIMIT_TX_BURST); + ret = ena_com_execute_admin_command(admin_queue, (struct ena_admin_aq_entry *)&cmd, sizeof(cmd), @@ -643,6 +649,7 @@ static int ena_com_config_llq_info(struct ena_com_dev *ena_dev, struct ena_llq_configurations *llq_default_cfg) { struct ena_com_llq_info *llq_info = &ena_dev->llq_info; + struct ena_admin_accel_mode_get llq_accel_mode_get; u16 supported_feat; int rc; @@ -742,9 +749,17 @@ static int ena_com_config_llq_info(struct ena_com_dev *ena_dev, llq_default_cfg->llq_num_decs_before_header, supported_feat, llq_info->descs_num_before_header); } + /* Check for accelerated queue supported */ + llq_accel_mode_get = llq_features->accel_mode.u.get; + + llq_info->disable_meta_caching = + !!(llq_accel_mode_get.supported_flags & + BIT(ENA_ADMIN_DISABLE_META_CACHING)); - llq_info->max_entries_in_tx_burst = - (u16)(llq_features->max_tx_burst_size / llq_default_cfg->llq_ring_entry_size_value); + if (llq_accel_mode_get.supported_flags & BIT(ENA_ADMIN_LIMIT_TX_BURST)) + llq_info->max_entries_in_tx_burst = + llq_accel_mode_get.max_tx_burst_size / + llq_default_cfg->llq_ring_entry_size_value; rc = ena_com_set_llq(ena_dev); if (rc) |