diff options
| author | Ben Hutchings <bhutchings@solarflare.com> | 2010-09-10 06:42:33 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-09-10 12:27:34 -0700 |
| commit | 4642610c77b345130d6b5a08c75d23ad98601fd5 (patch) | |
| tree | bf6345d84e6dbd3a3d44ff4e050dc862f01a01fc /drivers/net/sfc/efx.h | |
| parent | ecc910f520ba8f22848982ee816ad75c449b805d (diff) | |
sfc: Allow changing the DMA ring sizes dynamically via ethtool
This requires some reorganisation of channel setup and teardown to
ensure that we can always roll-back a failed change.
Based on work by Steve Hodgson <shodgson@solarflare.com>
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/sfc/efx.h')
| -rw-r--r-- | drivers/net/sfc/efx.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/net/sfc/efx.h b/drivers/net/sfc/efx.h index c15a2d3c2c2..e783c0fedfd 100644 --- a/drivers/net/sfc/efx.h +++ b/drivers/net/sfc/efx.h @@ -59,8 +59,15 @@ extern void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue); #define EFX_MAX_EVQ_SIZE 16384UL #define EFX_MIN_EVQ_SIZE 512UL +/* The smallest [rt]xq_entries that the driver supports. Callers of + * efx_wake_queue() assume that they can subsequently send at least one + * skb. Falcon/A1 may require up to three descriptors per skb_frag. */ +#define EFX_MIN_RING_SIZE (roundup_pow_of_two(2 * 3 * MAX_SKB_FRAGS)) + /* Channels */ extern void efx_process_channel_now(struct efx_channel *channel); +extern int +efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries); /* Ports */ extern int efx_reconfigure_port(struct efx_nic *efx); |