korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-12-18 08:35:08 +08:00
Code Issues Packages Projects Releases Wiki Activity

sfc: Disable flow control during flushes

Browse Source 
The TX DMA engine issues upstream read requests when there is room in
the TX FIFO for the completion. However, the fetches for the rest of
the packet might be delayed by any back pressure.  Since a flush must
wait for an EOP, the entire flush may be delayed by back pressure.

Mitigate this by disabling flow control before the flushes are
started.  Since PF and VF flushes run in parallel introduce
fc_disable, a reference count of the number of flushes outstanding.

The same principle could be applied to Falcon, but that
would bring with it its own testing.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Steve Hodgson 2011-05-23 12:18:45 +01:00 committed by Ben Hutchings
parent 90893000e2
commit a606f4325d
3 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/sfc/mcdi_mac.c
View File

@ -44,6 +44,8 @@ static int efx_mcdi_set_mac(struct efx_nic *efx)
}
if (efx->wanted_fc & EFX_FC_AUTO)
fcntl = MC_CMD_FCNTL_AUTO;
if (efx->fc_disable)
fcntl = MC_CMD_FCNTL_OFF;
MCDI_SET_DWORD(cmdbytes, SET_MAC_IN_FCNTL, fcntl);

4
drivers/net/ethernet/sfc/net_driver.h
View File

@ -670,6 +670,9 @@ struct efx_filter_state;
* @promiscuous: Promiscuous flag. Protected by netif_tx_lock.
* @multicast_hash: Multicast hash table
* @wanted_fc: Wanted flow control flags
* @fc_disable: When non-zero flow control is disabled. Typically used to
* ensure that network back pressure doesn't delay dma queue flushes.
* Serialised by the rtnl lock.
* @mac_work: Work item for changing MAC promiscuity and multicast hash
* @loopback_mode: Loopback status
* @loopback_modes: Supported loopback mode bitmask
@ -769,6 +772,7 @@ struct efx_nic {
bool promiscuous;
union efx_multicast_hash multicast_hash;
u8 wanted_fc;
unsigned fc_disable;
atomic_t rx_reset;
enum efx_loopback_mode loopback_mode;

3
drivers/net/ethernet/sfc/nic.c
View File

@ -677,6 +677,7 @@ int efx_nic_flush_queues(struct efx_nic *efx)
struct efx_tx_queue *tx_queue;
int rc = 0;
efx->fc_disable++;
efx->type->prepare_flush(efx);
efx_for_each_channel(channel, efx) {
@ -727,6 +728,8 @@ int efx_nic_flush_queues(struct efx_nic *efx)
atomic_set(&efx->rxq_flush_outstanding, 0);
}
efx->fc_disable--;
return rc;
}