Re: [PATCH V2 net 08/20] net/ena: add hardware hints capability to the driver
From: Netanel Belgazal
Date: Mon Dec 05 2016 - 13:31:57 EST
On 12/05/2016 06:31 AM, Matt Wilson wrote:
On Sun, Dec 04, 2016 at 03:19:26PM +0200, Netanel Belgazal wrote:
The ENA device can update the ena driver about the desire timeouts.
The hardware hints are transmitted as Asynchronous event to the driver.
This is really a new feature, not a bugfix - correct? If it is a new
feature, submit it separately. If the built-in defaults need to be
changed, submit that as a bugfix.
I'll submit this patch as a new feature.
There is a patch that sets the new defaults.
--msw
In case the device does not support this capability, the driver
will use its own defines.
Signed-off-by: Netanel Belgazal <netanel@xxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/amazon/ena/ena_admin_defs.h | 31 +++++++++
drivers/net/ethernet/amazon/ena/ena_com.c | 41 ++++++++---
drivers/net/ethernet/amazon/ena/ena_com.h | 5 ++
drivers/net/ethernet/amazon/ena/ena_ethtool.c | 1 -
drivers/net/ethernet/amazon/ena/ena_netdev.c | 86 +++++++++++++++++++-----
drivers/net/ethernet/amazon/ena/ena_netdev.h | 19 +++++-
drivers/net/ethernet/amazon/ena/ena_regs_defs.h | 2 +
7 files changed, 157 insertions(+), 28 deletions(-)
diff --git a/drivers/net/ethernet/amazon/ena/ena_admin_defs.h b/drivers/net/ethernet/amazon/ena/ena_admin_defs.h
index 6d70bf5..35ae511 100644
--- a/drivers/net/ethernet/amazon/ena/ena_admin_defs.h
+++ b/drivers/net/ethernet/amazon/ena/ena_admin_defs.h
@@ -70,6 +70,8 @@ enum ena_admin_aq_feature_id {
ENA_ADMIN_MAX_QUEUES_NUM = 2,
+ ENA_ADMIN_HW_HINTS = 3,
+
ENA_ADMIN_RSS_HASH_FUNCTION = 10,
ENA_ADMIN_STATELESS_OFFLOAD_CONFIG = 11,
@@ -749,6 +751,31 @@ struct ena_admin_feature_rss_ind_table {
struct ena_admin_rss_ind_table_entry inline_entry;
};
+/* When hint value is 0, driver should use it's own predefined value */
+struct ena_admin_ena_hw_hints {
+ /* value in ms */
+ u16 mmio_read_timeout;
+
+ /* value in ms */
+ u16 driver_watchdog_timeout;
+
+ /* Per packet tx completion timeout. value in ms */
+ u16 missing_tx_completion_timeout;
+
+ u16 missed_tx_completion_count_threshold_to_reset;
+
+ /* value in ms */
+ u16 admin_completion_tx_timeout;
+
+ u16 netdev_wd_timeout;
+
+ u16 max_tx_sgl_size;
+
+ u16 max_rx_sgl_size;
+
+ u16 reserved[8];
+};
+
struct ena_admin_get_feat_cmd {
struct ena_admin_aq_common_desc aq_common_descriptor;
@@ -782,6 +809,8 @@ struct ena_admin_get_feat_resp {
struct ena_admin_feature_rss_ind_table ind_table;
struct ena_admin_feature_intr_moder_desc intr_moderation;
+
+ struct ena_admin_ena_hw_hints hw_hints;
} u;
};
@@ -857,6 +886,8 @@ enum ena_admin_aenq_notification_syndrom {
ENA_ADMIN_SUSPEND = 0,
ENA_ADMIN_RESUME = 1,
+
+ ENA_ADMIN_UPDATE_HINTS = 2,
};
struct ena_admin_aenq_entry {
diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c
index 46aad3a..f1e4f04 100644
--- a/drivers/net/ethernet/amazon/ena/ena_com.c
+++ b/drivers/net/ethernet/amazon/ena/ena_com.c
@@ -508,15 +508,13 @@ static int ena_com_comp_status_to_errno(u8 comp_status)
static int ena_com_wait_and_process_admin_cq_polling(struct ena_comp_ctx *comp_ctx,
struct ena_com_admin_queue *admin_queue)
{
- unsigned long flags;
- u32 start_time;
+ unsigned long flags, timeout;
int ret;
- start_time = ((u32)jiffies_to_usecs(jiffies));
+ timeout = jiffies + usecs_to_jiffies(admin_queue->completion_timeout);
while (comp_ctx->status == ENA_CMD_SUBMITTED) {
- if ((((u32)jiffies_to_usecs(jiffies)) - start_time) >
- ADMIN_CMD_TIMEOUT_US) {
+ if (time_is_before_jiffies(timeout)) {
pr_err("Wait for completion (polling) timeout\n");
/* ENA didn't have any completion */
spin_lock_irqsave(&admin_queue->q_lock, flags);
@@ -560,7 +558,8 @@ static int ena_com_wait_and_process_admin_cq_interrupts(struct ena_comp_ctx *com
int ret;
wait_for_completion_timeout(&comp_ctx->wait_event,
- usecs_to_jiffies(ADMIN_CMD_TIMEOUT_US));
+ usecs_to_jiffies(
+ admin_queue->completion_timeout));
/* In case the command wasn't completed find out the root cause.
* There might be 2 kinds of errors
@@ -600,12 +599,14 @@ static u32 ena_com_reg_bar_read32(struct ena_com_dev *ena_dev, u16 offset)
struct ena_com_mmio_read *mmio_read = &ena_dev->mmio_read;
volatile struct ena_admin_ena_mmio_req_read_less_resp *read_resp =
mmio_read->read_resp;
- u32 mmio_read_reg, ret;
+ u32 mmio_read_reg, timeout, ret;
unsigned long flags;
int i;
might_sleep();
+ timeout = mmio_read->reg_read_to ? : ENA_REG_READ_TIMEOUT;
+
/* If readless is disabled, perform regular read */
if (!mmio_read->readless_supported)
return readl(ena_dev->reg_bar + offset);
@@ -626,14 +627,14 @@ static u32 ena_com_reg_bar_read32(struct ena_com_dev *ena_dev, u16 offset)
writel(mmio_read_reg, ena_dev->reg_bar + ENA_REGS_MMIO_REG_READ_OFF);
- for (i = 0; i < ENA_REG_READ_TIMEOUT; i++) {
+ for (i = 0; i < timeout; i++) {
if (read_resp->req_id == mmio_read->seq_num)
break;
udelay(1);
}
- if (unlikely(i == ENA_REG_READ_TIMEOUT)) {
+ if (unlikely(i == timeout)) {
pr_err("reading reg failed for timeout. expected: req id[%hu] offset[%hu] actual: req id[%hu] offset[%hu]\n",
mmio_read->seq_num, offset, read_resp->req_id,
read_resp->reg_off);
@@ -1717,6 +1718,20 @@ int ena_com_get_dev_attr_feat(struct ena_com_dev *ena_dev,
memcpy(&get_feat_ctx->offload, &get_resp.u.offload,
sizeof(get_resp.u.offload));
+ /* Driver hints isn't mandatory admin command. So in case the
+ * command isn't supported set driver hints to 0
+ */
+ rc = ena_com_get_feature(ena_dev, &get_resp, ENA_ADMIN_HW_HINTS);
+
+ if (!rc)
+ memcpy(&get_feat_ctx->hw_hints, &get_resp.u.hw_hints,
+ sizeof(get_resp.u.hw_hints));
+ else if (rc == -EPERM)
+ memset(&get_feat_ctx->hw_hints, 0x0,
+ sizeof(get_feat_ctx->hw_hints));
+ else
+ return rc;
+
return 0;
}
@@ -1842,6 +1857,14 @@ int ena_com_dev_reset(struct ena_com_dev *ena_dev)
return rc;
}
+ timeout = (cap & ENA_REGS_CAPS_ADMIN_CMD_TO_MASK) >>
+ ENA_REGS_CAPS_ADMIN_CMD_TO_SHIFT;
+ if (timeout)
+ /* the resolution of timeout reg is 100ms */
+ ena_dev->admin_queue.completion_timeout = timeout * 100000;
+ else
+ ena_dev->admin_queue.completion_timeout = ADMIN_CMD_TIMEOUT_US;
+
return 0;
}
diff --git a/drivers/net/ethernet/amazon/ena/ena_com.h b/drivers/net/ethernet/amazon/ena/ena_com.h
index 509d7b8..6883ee5 100644
--- a/drivers/net/ethernet/amazon/ena/ena_com.h
+++ b/drivers/net/ethernet/amazon/ena/ena_com.h
@@ -96,6 +96,8 @@
#define ENA_INTR_MODER_LEVEL_STRIDE 2
#define ENA_INTR_BYTE_COUNT_NOT_SUPPORTED 0xFFFFFF
+#define ENA_HW_HINTS_NO_TIMEOUT 0xFFFF
+
enum ena_intr_moder_level {
ENA_INTR_MODER_LOWEST = 0,
ENA_INTR_MODER_LOW,
@@ -232,6 +234,7 @@ struct ena_com_admin_queue {
void *q_dmadev;
spinlock_t q_lock; /* spinlock for the admin queue */
struct ena_comp_ctx *comp_ctx;
+ u32 completion_timeout;
u16 q_depth;
struct ena_com_admin_cq cq;
struct ena_com_admin_sq sq;
@@ -266,6 +269,7 @@ struct ena_com_aenq {
struct ena_com_mmio_read {
struct ena_admin_ena_mmio_req_read_less_resp *read_resp;
dma_addr_t read_resp_dma_addr;
+ u32 reg_read_to; /* in us */
u16 seq_num;
bool readless_supported;
/* spin lock to ensure a single outstanding read */
@@ -335,6 +339,7 @@ struct ena_com_dev_get_features_ctx {
struct ena_admin_device_attr_feature_desc dev_attr;
struct ena_admin_feature_aenq_desc aenq;
struct ena_admin_feature_offload_desc offload;
+ struct ena_admin_ena_hw_hints hw_hints;
};
struct ena_com_create_io_ctx {
diff --git a/drivers/net/ethernet/amazon/ena/ena_ethtool.c b/drivers/net/ethernet/amazon/ena/ena_ethtool.c
index 67b2338f..a1fbfc2 100644
--- a/drivers/net/ethernet/amazon/ena/ena_ethtool.c
+++ b/drivers/net/ethernet/amazon/ena/ena_ethtool.c
@@ -80,7 +80,6 @@ static const struct ena_stats ena_stats_tx_strings[] = {
ENA_STAT_TX_ENTRY(tx_poll),
ENA_STAT_TX_ENTRY(doorbells),
ENA_STAT_TX_ENTRY(prepare_ctx_err),
- ENA_STAT_TX_ENTRY(missing_tx_comp),
ENA_STAT_TX_ENTRY(bad_req_id),
};
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index 962ffb5..0b718ee 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -1981,6 +1981,7 @@ static netdev_tx_t ena_start_xmit(struct sk_buff *skb, struct net_device *dev)
tx_info->tx_descs = nb_hw_desc;
tx_info->last_jiffies = jiffies;
+ tx_info->print_once = 0;
tx_ring->next_to_use = ENA_TX_RING_IDX_NEXT(next_to_use,
tx_ring->ring_size);
@@ -2554,33 +2555,34 @@ static void check_for_missing_tx_completions(struct ena_adapter *adapter)
if (!test_bit(ENA_FLAG_DEV_UP, &adapter->flags))
return;
+ if (adapter->missing_tx_completion_to == ENA_HW_HINTS_NO_TIMEOUT)
+ return;
+
budget = ENA_MONITORED_TX_QUEUES;
for (i = adapter->last_monitored_tx_qid; i < adapter->num_queues; i++) {
tx_ring = &adapter->tx_ring[i];
+ missed_tx = 0;
+
for (j = 0; j < tx_ring->ring_size; j++) {
tx_buf = &tx_ring->tx_buffer_info[j];
last_jiffies = tx_buf->last_jiffies;
- if (unlikely(last_jiffies && time_is_before_jiffies(last_jiffies + TX_TIMEOUT))) {
- netif_notice(adapter, tx_err, adapter->netdev,
- "Found a Tx that wasn't completed on time, qid %d, index %d.\n",
- tx_ring->qid, j);
+ if (unlikely(last_jiffies && time_is_before_jiffies(last_jiffies + adapter->missing_tx_completion_to))) {
+ if (!tx_buf->print_once)
+ netif_notice(adapter, tx_err, adapter->netdev,
+ "Found a Tx that wasn't completed on time, qid %d, index %d.\n",
+ tx_ring->qid, j);
- u64_stats_update_begin(&tx_ring->syncp);
- missed_tx = tx_ring->tx_stats.missing_tx_comp++;
- u64_stats_update_end(&tx_ring->syncp);
+ tx_buf->print_once = 1;
+ missed_tx++;
- /* Clear last jiffies so the lost buffer won't
- * be counted twice.
- */
- tx_buf->last_jiffies = 0;
-
- if (unlikely(missed_tx > MAX_NUM_OF_TIMEOUTED_PACKETS)) {
+ if (unlikely(missed_tx > adapter->missing_tx_completion_threshold)) {
netif_err(adapter, tx_err, adapter->netdev,
"The number of lost tx completion is above the threshold (%d > %d). Reset the device\n",
- missed_tx, MAX_NUM_OF_TIMEOUTED_PACKETS);
+ missed_tx, adapter->missing_tx_completion_threshold);
set_bit(ENA_FLAG_TRIGGER_RESET, &adapter->flags);
+ return;
}
}
}
@@ -2601,8 +2603,11 @@ static void check_for_missing_keep_alive(struct ena_adapter *adapter)
if (!adapter->wd_state)
return;
- keep_alive_expired = round_jiffies(adapter->last_keep_alive_jiffies
- + ENA_DEVICE_KALIVE_TIMEOUT);
+ if (adapter->keep_alive_timeout == ENA_HW_HINTS_NO_TIMEOUT)
+ return;
+
+ keep_alive_expired = round_jiffies(adapter->last_keep_alive_jiffies +
+ adapter->keep_alive_timeout);
if (unlikely(time_is_before_jiffies(keep_alive_expired))) {
netif_err(adapter, drv, adapter->netdev,
"Keep alive watchdog timeout.\n");
@@ -2625,6 +2630,44 @@ static void check_for_admin_com_state(struct ena_adapter *adapter)
}
}
+static void ena_update_hints(struct ena_adapter *adapter,
+ struct ena_admin_ena_hw_hints *hints)
+{
+ struct net_device *netdev = adapter->netdev;
+
+ if (hints->admin_completion_tx_timeout)
+ adapter->ena_dev->admin_queue.completion_timeout =
+ hints->admin_completion_tx_timeout * 1000;
+
+ if (hints->mmio_read_timeout)
+ /* convert to usec */
+ adapter->ena_dev->mmio_read.reg_read_to =
+ hints->mmio_read_timeout * 1000;
+
+ if (hints->missed_tx_completion_count_threshold_to_reset)
+ adapter->missing_tx_completion_threshold =
+ hints->missed_tx_completion_count_threshold_to_reset;
+
+ if (hints->missing_tx_completion_timeout) {
+ if (hints->missing_tx_completion_timeout == ENA_HW_HINTS_NO_TIMEOUT)
+ adapter->missing_tx_completion_to = ENA_HW_HINTS_NO_TIMEOUT;
+ else
+ adapter->missing_tx_completion_to =
+ msecs_to_jiffies(hints->missing_tx_completion_timeout);
+ }
+
+ if (hints->netdev_wd_timeout)
+ netdev->watchdog_timeo = msecs_to_jiffies(hints->netdev_wd_timeout);
+
+ if (hints->driver_watchdog_timeout) {
+ if (hints->driver_watchdog_timeout == ENA_HW_HINTS_NO_TIMEOUT)
+ adapter->keep_alive_timeout = ENA_HW_HINTS_NO_TIMEOUT;
+ else
+ adapter->keep_alive_timeout =
+ msecs_to_jiffies(hints->driver_watchdog_timeout);
+ }
+}
+
static void ena_update_host_info(struct ena_admin_host_info *host_info,
struct net_device *netdev)
{
@@ -3036,6 +3079,11 @@ static int ena_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
INIT_WORK(&adapter->reset_task, ena_fw_reset_device);
adapter->last_keep_alive_jiffies = jiffies;
+ adapter->keep_alive_timeout = ENA_DEVICE_KALIVE_TIMEOUT;
+ adapter->missing_tx_completion_to = TX_TIMEOUT;
+ adapter->missing_tx_completion_threshold = MAX_NUM_OF_TIMEOUTED_PACKETS;
+
+ ena_update_hints(adapter, &get_feat_ctx.hw_hints);
init_timer(&adapter->timer_service);
adapter->timer_service.expires = round_jiffies(jiffies + HZ);
@@ -3256,6 +3304,7 @@ static void ena_notification(void *adapter_data,
struct ena_admin_aenq_entry *aenq_e)
{
struct ena_adapter *adapter = (struct ena_adapter *)adapter_data;
+ struct ena_admin_ena_hw_hints *hints;
WARN(aenq_e->aenq_common_desc.group != ENA_ADMIN_NOTIFICATION,
"Invalid group(%x) expected %x\n",
@@ -3273,6 +3322,11 @@ static void ena_notification(void *adapter_data,
case ENA_ADMIN_RESUME:
queue_work(ena_wq, &adapter->resume_io_task);
break;
+ case ENA_ADMIN_UPDATE_HINTS:
+ hints = (struct ena_admin_ena_hw_hints *)
+ (&aenq_e->inline_data_w4);
+ ena_update_hints(adapter, hints);
+ break;
default:
netif_err(adapter, drv, adapter->netdev,
"Invalid aenq notification link state %d\n",
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.h b/drivers/net/ethernet/amazon/ena/ena_netdev.h
index f0ddc11..2897fab 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.h
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.h
@@ -146,7 +146,18 @@ struct ena_tx_buffer {
u32 tx_descs;
/* num of buffers used by this skb */
u32 num_of_bufs;
- /* Save the last jiffies to detect missing tx packets */
+
+ /* Used for detect missing tx packets to limit the number of prints */
+ u32 print_once;
+ /* Save the last jiffies to detect missing tx packets
+ *
+ * sets to non zero value on ena_start_xmit and set to zero on
+ * napi and timer_Service_routine.
+ *
+ * while this value is not protected by lock,
+ * a given packet is not expected to be handled by ena_start_xmit
+ * and by napi/timer_service at the same time.
+ */
unsigned long last_jiffies;
struct ena_com_buf bufs[ENA_PKT_MAX_BUFS];
} ____cacheline_aligned;
@@ -170,7 +181,6 @@ struct ena_stats_tx {
u64 napi_comp;
u64 tx_poll;
u64 doorbells;
- u64 missing_tx_comp;
u64 bad_req_id;
};
@@ -270,6 +280,8 @@ struct ena_adapter {
struct msix_entry *msix_entries;
int msix_vecs;
+ u32 missing_tx_completion_threshold;
+
u32 tx_usecs, rx_usecs; /* interrupt moderation */
u32 tx_frames, rx_frames; /* interrupt moderation */
@@ -283,6 +295,9 @@ struct ena_adapter {
u8 mac_addr[ETH_ALEN];
+ unsigned long keep_alive_timeout;
+ unsigned long missing_tx_completion_to;
+
char name[ENA_NAME_MAX_LEN];
unsigned long flags;
diff --git a/drivers/net/ethernet/amazon/ena/ena_regs_defs.h b/drivers/net/ethernet/amazon/ena/ena_regs_defs.h
index 26097a2..c3891c5 100644
--- a/drivers/net/ethernet/amazon/ena/ena_regs_defs.h
+++ b/drivers/net/ethernet/amazon/ena/ena_regs_defs.h
@@ -78,6 +78,8 @@
#define ENA_REGS_CAPS_RESET_TIMEOUT_MASK 0x3e
#define ENA_REGS_CAPS_DMA_ADDR_WIDTH_SHIFT 8
#define ENA_REGS_CAPS_DMA_ADDR_WIDTH_MASK 0xff00
+#define ENA_REGS_CAPS_ADMIN_CMD_TO_SHIFT 16
+#define ENA_REGS_CAPS_ADMIN_CMD_TO_MASK 0xf0000
/* aq_caps register */
#define ENA_REGS_AQ_CAPS_AQ_DEPTH_MASK 0xffff