]> git.baikalelectronics.ru Git - kernel.git/commit
net: ena: add handling of llq max tx burst size
authorSameeh Jubran <sameehj@amazon.com>
Mon, 3 Jun 2019 14:43:19 +0000 (17:43 +0300)
committerDavid S. Miller <davem@davemloft.net>
Mon, 3 Jun 2019 20:30:38 +0000 (13:30 -0700)
commitffc89cf2e79588ba5fccc23c992b75e13d5c0707
treed2da27a35202005d05f44ace04638fcc585ea0b9
parentbd3ad8741fd3d160c3eac3929ea58d6ee677a728
net: ena: add handling of llq max tx burst size

There is a maximum TX burst size that the ENA device can handle.
It is exposed by the device to the driver and the driver
needs to comply with it to avoid bugs.

In this commit we:
1. Add ena_com_is_doorbell_needed(), which calculates the number of
   llq entries that will be used to hold a packet, and will return
   true if they exceed the number of allowed entries in a burst.
   If the function returns true, a doorbell needs to be invoked
   to send this packet in the next burst.

2. Follow the available entries in the current burst:
   - Every doorbell a new burst begins
   - With each write of an llq entry, the available entries in the
     current burst are decreased by 1.

Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: Sameeh Jubran <sameehj@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/amazon/ena/ena_admin_defs.h
drivers/net/ethernet/amazon/ena/ena_com.c
drivers/net/ethernet/amazon/ena/ena_com.h
drivers/net/ethernet/amazon/ena/ena_eth_com.c
drivers/net/ethernet/amazon/ena/ena_eth_com.h
drivers/net/ethernet/amazon/ena/ena_netdev.c