312 lines
7.3 KiB
C
312 lines
7.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2019 Mellanox Technologies. */
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#include <net/devlink.h>
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#include "reporter.h"
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#include "lib/eq.h"
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#define MLX5E_TX_REPORTER_PER_SQ_MAX_LEN 256
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struct mlx5e_tx_err_ctx {
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int (*recover)(struct mlx5e_txqsq *sq);
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struct mlx5e_txqsq *sq;
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};
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static int mlx5e_wait_for_sq_flush(struct mlx5e_txqsq *sq)
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{
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unsigned long exp_time = jiffies + msecs_to_jiffies(2000);
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while (time_before(jiffies, exp_time)) {
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if (sq->cc == sq->pc)
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return 0;
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msleep(20);
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}
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netdev_err(sq->channel->netdev,
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"Wait for SQ 0x%x flush timeout (sq cc = 0x%x, sq pc = 0x%x)\n",
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sq->sqn, sq->cc, sq->pc);
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return -ETIMEDOUT;
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}
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static void mlx5e_reset_txqsq_cc_pc(struct mlx5e_txqsq *sq)
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{
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WARN_ONCE(sq->cc != sq->pc,
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"SQ 0x%x: cc (0x%x) != pc (0x%x)\n",
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sq->sqn, sq->cc, sq->pc);
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sq->cc = 0;
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sq->dma_fifo_cc = 0;
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sq->pc = 0;
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}
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static int mlx5e_sq_to_ready(struct mlx5e_txqsq *sq, int curr_state)
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{
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struct mlx5_core_dev *mdev = sq->channel->mdev;
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struct net_device *dev = sq->channel->netdev;
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struct mlx5e_modify_sq_param msp = {0};
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int err;
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msp.curr_state = curr_state;
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msp.next_state = MLX5_SQC_STATE_RST;
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err = mlx5e_modify_sq(mdev, sq->sqn, &msp);
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if (err) {
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netdev_err(dev, "Failed to move sq 0x%x to reset\n", sq->sqn);
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return err;
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}
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memset(&msp, 0, sizeof(msp));
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msp.curr_state = MLX5_SQC_STATE_RST;
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msp.next_state = MLX5_SQC_STATE_RDY;
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err = mlx5e_modify_sq(mdev, sq->sqn, &msp);
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if (err) {
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netdev_err(dev, "Failed to move sq 0x%x to ready\n", sq->sqn);
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return err;
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}
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return 0;
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}
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static int mlx5e_tx_reporter_err_cqe_recover(struct mlx5e_txqsq *sq)
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{
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struct mlx5_core_dev *mdev = sq->channel->mdev;
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struct net_device *dev = sq->channel->netdev;
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u8 state;
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int err;
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err = mlx5_core_query_sq_state(mdev, sq->sqn, &state);
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if (err) {
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netdev_err(dev, "Failed to query SQ 0x%x state. err = %d\n",
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sq->sqn, err);
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goto out;
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}
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if (state != MLX5_SQC_STATE_ERR)
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goto out;
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mlx5e_tx_disable_queue(sq->txq);
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err = mlx5e_wait_for_sq_flush(sq);
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if (err)
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goto out;
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/* At this point, no new packets will arrive from the stack as TXQ is
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* marked with QUEUE_STATE_DRV_XOFF. In addition, NAPI cleared all
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* pending WQEs. SQ can safely reset the SQ.
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*/
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err = mlx5e_sq_to_ready(sq, state);
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if (err)
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goto out;
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mlx5e_reset_txqsq_cc_pc(sq);
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sq->stats->recover++;
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clear_bit(MLX5E_SQ_STATE_RECOVERING, &sq->state);
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mlx5e_activate_txqsq(sq);
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return 0;
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out:
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clear_bit(MLX5E_SQ_STATE_RECOVERING, &sq->state);
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return err;
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}
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static int mlx5_tx_health_report(struct devlink_health_reporter *tx_reporter,
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char *err_str,
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struct mlx5e_tx_err_ctx *err_ctx)
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{
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if (IS_ERR_OR_NULL(tx_reporter)) {
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netdev_err(err_ctx->sq->channel->netdev, err_str);
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return err_ctx->recover(err_ctx->sq);
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}
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return devlink_health_report(tx_reporter, err_str, err_ctx);
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}
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void mlx5e_tx_reporter_err_cqe(struct mlx5e_txqsq *sq)
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{
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char err_str[MLX5E_TX_REPORTER_PER_SQ_MAX_LEN];
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struct mlx5e_tx_err_ctx err_ctx = {0};
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err_ctx.sq = sq;
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err_ctx.recover = mlx5e_tx_reporter_err_cqe_recover;
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sprintf(err_str, "ERR CQE on SQ: 0x%x", sq->sqn);
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mlx5_tx_health_report(sq->channel->priv->tx_reporter, err_str,
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&err_ctx);
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}
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static int mlx5e_tx_reporter_timeout_recover(struct mlx5e_txqsq *sq)
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{
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struct mlx5_eq_comp *eq = sq->cq.mcq.eq;
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u32 eqe_count;
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netdev_err(sq->channel->netdev, "EQ 0x%x: Cons = 0x%x, irqn = 0x%x\n",
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eq->core.eqn, eq->core.cons_index, eq->core.irqn);
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eqe_count = mlx5_eq_poll_irq_disabled(eq);
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if (!eqe_count) {
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clear_bit(MLX5E_SQ_STATE_ENABLED, &sq->state);
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return -EIO;
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}
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netdev_err(sq->channel->netdev, "Recover %d eqes on EQ 0x%x\n",
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eqe_count, eq->core.eqn);
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sq->channel->stats->eq_rearm++;
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return 0;
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}
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int mlx5e_tx_reporter_timeout(struct mlx5e_txqsq *sq)
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{
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char err_str[MLX5E_TX_REPORTER_PER_SQ_MAX_LEN];
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struct mlx5e_tx_err_ctx err_ctx;
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err_ctx.sq = sq;
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err_ctx.recover = mlx5e_tx_reporter_timeout_recover;
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sprintf(err_str,
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"TX timeout on queue: %d, SQ: 0x%x, CQ: 0x%x, SQ Cons: 0x%x SQ Prod: 0x%x, usecs since last trans: %u\n",
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sq->channel->ix, sq->sqn, sq->cq.mcq.cqn, sq->cc, sq->pc,
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jiffies_to_usecs(jiffies - sq->txq->trans_start));
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return mlx5_tx_health_report(sq->channel->priv->tx_reporter, err_str,
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&err_ctx);
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}
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/* state lock cannot be grabbed within this function.
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* It can cause a dead lock or a read-after-free.
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*/
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static int mlx5e_tx_reporter_recover_from_ctx(struct mlx5e_tx_err_ctx *err_ctx)
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{
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return err_ctx->recover(err_ctx->sq);
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}
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static int mlx5e_tx_reporter_recover_all(struct mlx5e_priv *priv)
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{
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int err = 0;
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rtnl_lock();
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mutex_lock(&priv->state_lock);
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if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
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goto out;
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err = mlx5e_safe_reopen_channels(priv);
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out:
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mutex_unlock(&priv->state_lock);
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rtnl_unlock();
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return err;
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}
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static int mlx5e_tx_reporter_recover(struct devlink_health_reporter *reporter,
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void *context)
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{
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struct mlx5e_priv *priv = devlink_health_reporter_priv(reporter);
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struct mlx5e_tx_err_ctx *err_ctx = context;
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return err_ctx ? mlx5e_tx_reporter_recover_from_ctx(err_ctx) :
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mlx5e_tx_reporter_recover_all(priv);
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}
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static int
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mlx5e_tx_reporter_build_diagnose_output(struct devlink_fmsg *fmsg,
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u32 sqn, u8 state, bool stopped)
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{
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int err;
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err = devlink_fmsg_obj_nest_start(fmsg);
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if (err)
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return err;
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err = devlink_fmsg_u32_pair_put(fmsg, "sqn", sqn);
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if (err)
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return err;
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err = devlink_fmsg_u8_pair_put(fmsg, "HW state", state);
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if (err)
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return err;
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err = devlink_fmsg_bool_pair_put(fmsg, "stopped", stopped);
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if (err)
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return err;
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err = devlink_fmsg_obj_nest_end(fmsg);
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if (err)
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return err;
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return 0;
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}
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static int mlx5e_tx_reporter_diagnose(struct devlink_health_reporter *reporter,
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struct devlink_fmsg *fmsg)
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{
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struct mlx5e_priv *priv = devlink_health_reporter_priv(reporter);
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int i, err = 0;
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mutex_lock(&priv->state_lock);
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if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
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goto unlock;
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err = devlink_fmsg_arr_pair_nest_start(fmsg, "SQs");
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if (err)
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goto unlock;
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for (i = 0; i < priv->channels.num * priv->channels.params.num_tc;
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i++) {
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struct mlx5e_txqsq *sq = priv->txq2sq[i];
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u8 state;
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err = mlx5_core_query_sq_state(priv->mdev, sq->sqn, &state);
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if (err)
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goto unlock;
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err = mlx5e_tx_reporter_build_diagnose_output(fmsg, sq->sqn,
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state,
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netif_xmit_stopped(sq->txq));
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if (err)
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goto unlock;
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}
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err = devlink_fmsg_arr_pair_nest_end(fmsg);
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if (err)
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goto unlock;
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unlock:
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mutex_unlock(&priv->state_lock);
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return err;
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}
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static const struct devlink_health_reporter_ops mlx5_tx_reporter_ops = {
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.name = "tx",
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.recover = mlx5e_tx_reporter_recover,
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.diagnose = mlx5e_tx_reporter_diagnose,
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};
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#define MLX5_REPORTER_TX_GRACEFUL_PERIOD 500
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int mlx5e_tx_reporter_create(struct mlx5e_priv *priv)
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{
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struct mlx5_core_dev *mdev = priv->mdev;
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struct devlink *devlink = priv_to_devlink(mdev);
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priv->tx_reporter =
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devlink_health_reporter_create(devlink, &mlx5_tx_reporter_ops,
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MLX5_REPORTER_TX_GRACEFUL_PERIOD,
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true, priv);
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if (IS_ERR(priv->tx_reporter))
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netdev_warn(priv->netdev,
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"Failed to create tx reporter, err = %ld\n",
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PTR_ERR(priv->tx_reporter));
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return IS_ERR_OR_NULL(priv->tx_reporter);
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}
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void mlx5e_tx_reporter_destroy(struct mlx5e_priv *priv)
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{
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if (IS_ERR_OR_NULL(priv->tx_reporter))
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return;
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devlink_health_reporter_destroy(priv->tx_reporter);
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}
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