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net/mlx5e: Timeout if SQ doesn't flush during close 

Avoid an infinite loop by timing out waiting for the SQ to flush. Also
clean up the TX descriptors if that happens.

Fixes: f62b8bb8f2 ('net/mlx5: Extend mlx5_core to support ConnectX-4 Ethernet functionality')
Signed-off-by: Daniel Jurgens <danielj@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Jurgens 2016-06-30 17:34:44 +03:00 committed by David S. Miller
parent 65ee670845
commit 29429f3300
3 changed files with 56 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/mellanox/mlx5/core/en.h
View File

@ -305,6 +305,7 @@ struct mlx5e_sq_dma {
enum {
MLX5E_SQ_STATE_WAKE_TXQ_ENABLE,
MLX5E_SQ_STATE_BF_ENABLE,
MLX5E_SQ_STATE_TX_TIMEOUT,
};
struct mlx5e_ico_wqe_info {
@ -589,6 +590,7 @@ void mlx5e_cq_error_event(struct mlx5_core_cq *mcq, enum mlx5_event event);
int mlx5e_napi_poll(struct napi_struct *napi, int budget);
bool mlx5e_poll_tx_cq(struct mlx5e_cq *cq, int napi_budget);
int mlx5e_poll_rx_cq(struct mlx5e_cq *cq, int budget);
void mlx5e_free_tx_descs(struct mlx5e_sq *sq);
void mlx5e_handle_rx_cqe(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe);
void mlx5e_handle_rx_cqe_mpwrq(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe);

25
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
View File

@ -39,6 +39,13 @@
#include "eswitch.h"
#include "vxlan.h"
enum {
MLX5_EN_QP_FLUSH_TIMEOUT_MS = 5000,
MLX5_EN_QP_FLUSH_MSLEEP_QUANT = 20,
MLX5_EN_QP_FLUSH_MAX_ITER = MLX5_EN_QP_FLUSH_TIMEOUT_MS /
MLX5_EN_QP_FLUSH_MSLEEP_QUANT,
};
struct mlx5e_rq_param {
u32 rqc[MLX5_ST_SZ_DW(rqc)];
struct mlx5_wq_param wq;
@ -782,6 +789,9 @@ static inline void netif_tx_disable_queue(struct netdev_queue *txq)
static void mlx5e_close_sq(struct mlx5e_sq *sq)
{
int tout = 0;
int err;
if (sq->txq) {
clear_bit(MLX5E_SQ_STATE_WAKE_TXQ_ENABLE, &sq->state);
/* prevent netif_tx_wake_queue */
@ -792,15 +802,24 @@ static void mlx5e_close_sq(struct mlx5e_sq *sq)
if (mlx5e_sq_has_room_for(sq, 1))
mlx5e_send_nop(sq, true);
mlx5e_modify_sq(sq, MLX5_SQC_STATE_RDY, MLX5_SQC_STATE_ERR);
err = mlx5e_modify_sq(sq, MLX5_SQC_STATE_RDY,
MLX5_SQC_STATE_ERR);
if (err)
set_bit(MLX5E_SQ_STATE_TX_TIMEOUT, &sq->state);
}
while (sq->cc != sq->pc) /* wait till sq is empty */
msleep(20);
/* wait till sq is empty, unless a TX timeout occurred on this SQ */
while (sq->cc != sq->pc &&
!test_bit(MLX5E_SQ_STATE_TX_TIMEOUT, &sq->state)) {
msleep(MLX5_EN_QP_FLUSH_MSLEEP_QUANT);
if (tout++ > MLX5_EN_QP_FLUSH_MAX_ITER)
set_bit(MLX5E_SQ_STATE_TX_TIMEOUT, &sq->state);
}
/* avoid destroying sq before mlx5e_poll_tx_cq() is done with it */
napi_synchronize(&sq->channel->napi);
mlx5e_free_tx_descs(sq);
mlx5e_disable_sq(sq);
mlx5e_destroy_sq(sq);
}

32
drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
View File

@ -341,6 +341,35 @@ netdev_tx_t mlx5e_xmit(struct sk_buff *skb, struct net_device *dev)
return mlx5e_sq_xmit(sq, skb);
}
void mlx5e_free_tx_descs(struct mlx5e_sq *sq)
{
struct mlx5e_tx_wqe_info *wi;
struct sk_buff *skb;
u16 ci;
int i;
while (sq->cc != sq->pc) {
ci = sq->cc & sq->wq.sz_m1;
skb = sq->skb[ci];
wi = &sq->wqe_info[ci];
if (!skb) { /* nop */
sq->cc++;
continue;
}
for (i = 0; i < wi->num_dma; i++) {
struct mlx5e_sq_dma *dma =
mlx5e_dma_get(sq, sq->dma_fifo_cc++);
mlx5e_tx_dma_unmap(sq->pdev, dma);
}
dev_kfree_skb_any(skb);
sq->cc += wi->num_wqebbs;
}
}
bool mlx5e_poll_tx_cq(struct mlx5e_cq *cq, int napi_budget)
{
struct mlx5e_sq *sq;
@ -352,6 +381,9 @@ bool mlx5e_poll_tx_cq(struct mlx5e_cq *cq, int napi_budget)
sq = container_of(cq, struct mlx5e_sq, cq);
if (unlikely(test_bit(MLX5E_SQ_STATE_TX_TIMEOUT, &sq->state)))
return false;
npkts = 0;
nbytes = 0;