diff options
| author | David Awogbemila <awogbemila@google.com> | 2021-10-24 11:42:37 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-10-25 14:13:12 +0100 |
| commit | 37149e9374bf7271563f7477ace9014ebc65a8af (patch) | |
| tree | 05877f2c1e56b83ed4c49a87aa2487897f11ee9c /drivers/net/ethernet/google/gve/gve.h | |
| parent | 1344e751e91092ac0cb63b194621e59d2f364197 (diff) | |
gve: Implement packet continuation for RX.
This enables the driver to receive RX packets spread across multiple
buffers:
For a given multi-fragment packet the "packet continuation" bit is set
on all descriptors except the last one. These descriptors' payloads are
combined into a single SKB before the SKB is handed to the
networking stack.
This change adds a "packet buffer size" notion for RX queues. The
CreateRxQueue AdminQueue command sent to the device now includes the
packet_buffer_size.
We opt for a packet_buffer_size of PAGE_SIZE / 2 to give the
driver the opportunity to flip pages where we can instead of copying.
Signed-off-by: David Awogbemila <awogbemila@google.com>
Signed-off-by: Jeroen de Borst <jeroendb@google.com>
Reviewed-by: Catherine Sullivan <csully@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/google/gve/gve.h')
| -rw-r--r-- | drivers/net/ethernet/google/gve/gve.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/net/ethernet/google/gve/gve.h b/drivers/net/ethernet/google/gve/gve.h index 03ef8e039065..b719f72281c4 100644 --- a/drivers/net/ethernet/google/gve/gve.h +++ b/drivers/net/ethernet/google/gve/gve.h @@ -149,6 +149,10 @@ struct gve_rx_ctx { /* head and tail of skb chain for the current packet or NULL if none */ struct sk_buff *skb_head; struct sk_buff *skb_tail; + u16 total_expected_size; + u8 expected_frag_cnt; + u8 curr_frag_cnt; + u8 reuse_frags; }; /* Contains datapath state used to represent an RX queue. */ @@ -162,6 +166,7 @@ struct gve_rx_ring { /* threshold for posting new buffs and descs */ u32 db_threshold; + u16 packet_buffer_size; }; /* DQO fields. */ @@ -209,6 +214,9 @@ struct gve_rx_ring { u64 rx_skb_alloc_fail; /* free-running count of skb alloc fails */ u64 rx_buf_alloc_fail; /* free-running count of buffer alloc fails */ u64 rx_desc_err_dropped_pkt; /* free-running count of packets dropped by descriptor error */ + u64 rx_cont_packet_cnt; /* free-running multi-fragment packets received */ + u64 rx_frag_flip_cnt; /* free-running count of rx segments where page_flip was used */ + u64 rx_frag_copy_cnt; /* free-running count of rx segments copied into skb linear portion */ u32 q_num; /* queue index */ u32 ntfy_id; /* notification block index */ struct gve_queue_resources *q_resources; /* head and tail pointer idx */ |