net/mlx5e: Poll event queue upon TX timeout before performing full channels recovery

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Up until this patch, on every TX timeout we would try to do channels
recovery.  However, in case of a lost interrupt for an EQ, the channel
associated to it cannot be recovered if reopened as it would never get
another interrupt on sent/received traffic, and eventually ends up with
another TX timeout (Restarting the EQ is not part of channel recovery).

This patch adds a mechanism for explicitly polling EQ in case of a TX
timeout in order to recover from a lost interrupt. If this is not the
case (no pending EQEs), perform a channels full recovery as usual.

Once a lost EQE is recovered, it triggers the NAPI to run and handle all
pending completions. This will free some budget in the bql (via calling
netdev_tx_completed_queue) or by clearing pending TXWQEs and waking up
the queue.  One of the above actions will move the queue to be ready for
transmit again.

Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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Eran Ben Elisha 2017-12-19 14:52:29 +02:00 • committed by Saeed Mahameed

parent 3a32b26a4e

commit 7ca560b5af

3 changed files with 55 additions and 15 deletions

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51

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

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18

drivers/net/ethernet/mellanox/mlx5/core/eq.c

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1

drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h

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