cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c

/*
 * Copyright (c) 2015, Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "en.h"


struct mlx5_cqe64 *mlx5e_get_cqe(struct mlx5e_cq *cq) { struct mlx5_cqwq *wq = &cq->wq; u32 ci = mlx5_cqwq_get_ci(wq); struct mlx5_cqe64 *cqe = mlx5_cqwq_get_wqe(wq, ci); int cqe_ownership_bit = cqe->op_own & MLX5_CQE_OWNER_MASK; int sw_ownership_val = mlx5_cqwq_get_wrap_cnt(wq) & 1; if (cqe_ownership_bit != sw_ownership_val) return NULL; /* ensure cqe content is read after cqe ownership bit */ rmb(); return cqe; }

Contributors

PersonTokensPropCommitsCommitProp
Amir Vadai77100.00%1100.00%
Total77100.00%1100.00%


static void mlx5e_poll_ico_cq(struct mlx5e_cq *cq) { struct mlx5e_sq *sq = container_of(cq, struct mlx5e_sq, cq); struct mlx5_wq_cyc *wq; struct mlx5_cqe64 *cqe; u16 sqcc; if (unlikely(!test_bit(MLX5E_SQ_STATE_ENABLED, &sq->state))) return; cqe = mlx5e_get_cqe(cq); if (likely(!cqe)) return; wq = &sq->wq; /* sq->cc must be updated only after mlx5_cqwq_update_db_record(), * otherwise a cq overrun may occur */ sqcc = sq->cc; do { u16 ci = be16_to_cpu(cqe->wqe_counter) & wq->sz_m1; struct mlx5e_sq_wqe_info *icowi = &sq->db.ico_wqe[ci]; mlx5_cqwq_pop(&cq->wq); sqcc += icowi->num_wqebbs; if (unlikely((cqe->op_own >> 4) != MLX5_CQE_REQ)) { WARN_ONCE(true, "mlx5e: Bad OP in ICOSQ CQE: 0x%x\n", cqe->op_own); break; } switch (icowi->opcode) { case MLX5_OPCODE_NOP: break; case MLX5_OPCODE_UMR: mlx5e_post_rx_mpwqe(&sq->channel->rq); break; default: WARN_ONCE(true, "mlx5e: Bad OPCODE in ICOSQ WQE info: 0x%x\n", icowi->opcode); } } while ((cqe = mlx5e_get_cqe(cq))); mlx5_cqwq_update_db_record(&cq->wq); /* ensure cq space is freed before enabling more cqes */ wmb(); sq->cc = sqcc; }

Contributors

PersonTokensPropCommitsCommitProp
Tariq Toukan19384.28%342.86%
Saeed Mahameed3414.85%342.86%
Mohamad Haj Yahia20.87%114.29%
Total229100.00%7100.00%


static inline bool mlx5e_poll_xdp_tx_cq(struct mlx5e_cq *cq) { struct mlx5e_sq *sq; u16 sqcc; int i; sq = container_of(cq, struct mlx5e_sq, cq); if (unlikely(!test_bit(MLX5E_SQ_STATE_ENABLED, &sq->state))) return false; /* sq->cc must be updated only after mlx5_cqwq_update_db_record(), * otherwise a cq overrun may occur */ sqcc = sq->cc; for (i = 0; i < MLX5E_TX_CQ_POLL_BUDGET; i++) { struct mlx5_cqe64 *cqe; u16 wqe_counter; bool last_wqe; cqe = mlx5e_get_cqe(cq); if (!cqe) break; mlx5_cqwq_pop(&cq->wq); wqe_counter = be16_to_cpu(cqe->wqe_counter); do { struct mlx5e_sq_wqe_info *wi; struct mlx5e_dma_info *di; u16 ci; last_wqe = (sqcc == wqe_counter); ci = sqcc & sq->wq.sz_m1; di = &sq->db.xdp.di[ci]; wi = &sq->db.xdp.wqe_info[ci]; if (unlikely(wi->opcode == MLX5_OPCODE_NOP)) { sqcc++; continue; } sqcc += wi->num_wqebbs; /* Recycle RX page */ mlx5e_page_release(&sq->channel->rq, di, true); } while (!last_wqe); } mlx5_cqwq_update_db_record(&cq->wq); /* ensure cq space is freed before enabling more cqes */ wmb(); sq->cc = sqcc; return (i == MLX5E_TX_CQ_POLL_BUDGET); }

Contributors

PersonTokensPropCommitsCommitProp
Saeed Mahameed24699.19%150.00%
Mohamad Haj Yahia20.81%150.00%
Total248100.00%2100.00%


int mlx5e_napi_poll(struct napi_struct *napi, int budget) { struct mlx5e_channel *c = container_of(napi, struct mlx5e_channel, napi); bool busy = false; int work_done; int i; clear_bit(MLX5E_CHANNEL_NAPI_SCHED, &c->flags); for (i = 0; i < c->num_tc; i++) busy |= mlx5e_poll_tx_cq(&c->sq[i].cq, budget); work_done = mlx5e_poll_rx_cq(&c->rq.cq, budget); busy |= work_done == budget; if (c->xdp) busy |= mlx5e_poll_xdp_tx_cq(&c->xdp_sq.cq); mlx5e_poll_ico_cq(&c->icosq.cq); busy |= mlx5e_post_rx_wqes(&c->rq); if (busy) return budget; napi_complete_done(napi, work_done); /* avoid losing completion event during/after polling cqs */ if (test_bit(MLX5E_CHANNEL_NAPI_SCHED, &c->flags)) { napi_schedule(napi); return work_done; } for (i = 0; i < c->num_tc; i++) mlx5e_cq_arm(&c->sq[i].cq); if (test_bit(MLX5E_RQ_STATE_AM, &c->rq.state)) mlx5e_rx_am(&c->rq); mlx5e_cq_arm(&c->rq.cq); mlx5e_cq_arm(&c->icosq.cq); return work_done; }

Contributors

PersonTokensPropCommitsCommitProp
Amir Vadai17068.27%114.29%
Gil Rockah228.84%114.29%
Tariq Toukan208.03%114.29%
Saeed Mahameed187.23%114.29%
Eric Dumazet166.43%114.29%
Jesper Dangaard Brouer20.80%114.29%
Achiad Shochat10.40%114.29%
Total249100.00%7100.00%


void mlx5e_completion_event(struct mlx5_core_cq *mcq) { struct mlx5e_cq *cq = container_of(mcq, struct mlx5e_cq, mcq); cq->event_ctr++; set_bit(MLX5E_CHANNEL_NAPI_SCHED, &cq->channel->flags); napi_schedule(cq->napi); }

Contributors

PersonTokensPropCommitsCommitProp
Amir Vadai4489.80%150.00%
Gil Rockah510.20%150.00%
Total49100.00%2100.00%


void mlx5e_cq_error_event(struct mlx5_core_cq *mcq, enum mlx5_event event) { struct mlx5e_cq *cq = container_of(mcq, struct mlx5e_cq, mcq); struct mlx5e_channel *c = cq->channel; struct mlx5e_priv *priv = c->priv; struct net_device *netdev = priv->netdev; netdev_err(netdev, "%s: cqn=0x%.6x event=0x%.2x\n", __func__, mcq->cqn, event); }

Contributors

PersonTokensPropCommitsCommitProp
Amir Vadai71100.00%1100.00%
Total71100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Amir Vadai36639.48%18.33%
Saeed Mahameed29832.15%325.00%
Tariq Toukan21322.98%325.00%
Gil Rockah272.91%18.33%
Eric Dumazet161.73%18.33%
Mohamad Haj Yahia40.43%18.33%
Jesper Dangaard Brouer20.22%18.33%
Achiad Shochat10.11%18.33%
Total927100.00%12100.00%
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