diff options
Diffstat (limited to 'drivers/net/sfc/net_driver.h')
| -rw-r--r-- | drivers/net/sfc/net_driver.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/net/sfc/net_driver.h b/drivers/net/sfc/net_driver.h index 60d63711d43..270e217a53f 100644 --- a/drivers/net/sfc/net_driver.h +++ b/drivers/net/sfc/net_driver.h @@ -142,6 +142,12 @@ struct efx_tx_buffer { * @flushed: Used when handling queue flushing * @read_count: Current read pointer. * This is the number of buffers that have been removed from both rings. + * @old_write_count: The value of @write_count when last checked. + * This is here for performance reasons. The xmit path will + * only get the up-to-date value of @write_count if this + * variable indicates that the queue is empty. This is to + * avoid cache-line ping-pong between the xmit path and the + * completion path. * @stopped: Stopped count. * Set if this TX queue is currently stopping its port. * @insert_count: Current insert pointer @@ -163,6 +169,10 @@ struct efx_tx_buffer { * @tso_long_headers: Number of packets with headers too long for standard * blocks * @tso_packets: Number of packets via the TSO xmit path + * @pushes: Number of times the TX push feature has been used + * @empty_read_count: If the completion path has seen the queue as empty + * and the transmission path has not yet checked this, the value of + * @read_count bitwise-added to %EFX_EMPTY_COUNT_VALID; otherwise 0. */ struct efx_tx_queue { /* Members which don't change on the fast path */ @@ -177,6 +187,7 @@ struct efx_tx_queue { /* Members used mainly on the completion path */ unsigned int read_count ____cacheline_aligned_in_smp; + unsigned int old_write_count; int stopped; /* Members used only on the xmit path */ @@ -187,6 +198,11 @@ struct efx_tx_queue { unsigned int tso_bursts; unsigned int tso_long_headers; unsigned int tso_packets; + unsigned int pushes; + + /* Members shared between paths and sometimes updated */ + unsigned int empty_read_count ____cacheline_aligned_in_smp; +#define EFX_EMPTY_COUNT_VALID 0x80000000 }; /** |