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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>
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This refactor moves the skb_head and skb_tail fields into a new
gve_rx_ctx struct. This new struct will contain information about the
current packet being processed. This is in preparation for
multi-descriptor RX packets.
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>
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The prefetch is incorrectly using the dma address instead of the virtual
address.
It's supposed to be:
prefetch((char *)buf_state->page_info.page_address +
buf_state->page_info.page_offset)
However, after correcting this mistake, there is no evidence of
performance improvement.
Fixes: 9b8dd5e5ea48 ("gve: DQO: Add RX path")
Signed-off-by: Bailey Forrest <bcf@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The rx->dqo.buf_states[] array is allocated in gve_rx_alloc_ring_dqo()
and it has rx->dqo.num_buf_states so this > needs to >= to prevent an
out of bounds access.
Fixes: 9b8dd5e5ea48 ("gve: DQO: Add RX path")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The RX queue has an array of `gve_rx_buf_state_dqo` objects. All
allocated pages have an associated buf_state object. When a buffer is
posted on the RX buffer queue, the buffer ID will be the buf_state's
index into the RX queue's array.
On packet reception, the RX queue will have one descriptor for each
buffer associated with a received packet. Each RX descriptor will have
a buffer_id that was posted on the buffer queue.
Notable mentions:
- We use a default buffer size of 2048 bytes. Based on page size, we
may post separate sections of a single page as separate buffers.
- The driver holds an extra reference on pages passed up the receive
path with an skb and keeps these pages on a list. When posting new
buffers to the NIC, we check if any of these pages has only our
reference, or another buffer sized segment of the page has no
references. If so, it is free to reuse. This page recycling approach
is a common netdev optimization that reduces page alloc/free calls.
- Pages in the free list have a page_count bias in order to avoid an
atomic increment of pagecount every time we attempt to reuse a page.
# references = page_count() - bias
- In order to track when a page is safe to reuse, we keep track of the
last offset which had a single SKB reference. When this occurs, it
implies that every single other offset is reusable. Otherwise, we
don't know if offsets can be safely reused.
- We maintain two free lists of pages. List #1 (recycled_buf_states)
contains pages we know can be reused right away. List #2
(used_buf_states) contains pages which cannot be used right away. We
only attempt to get pages from list #2 when list #1 is empty. We only
attempt to use a small fixed number pages from list #2 before giving
up and allocating a new page. Both lists are FIFOs in hope that by the
time we attempt to reuse a page, the references were dropped.
Signed-off-by: Bailey Forrest <bcf@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Catherine Sullivan <csully@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Allocate the buffer and completion ring structures. Do not populate the
rings yet. That will happen in the respective rx and tx datapath
follow-on patches
Signed-off-by: Bailey Forrest <bcf@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Catherine Sullivan <csully@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Add napi netdev device registration, interrupt handling and initial tx
and rx polling stubs. The stubs will be filled in follow-on patches.
Also:
- LRO feature advertisement and handling
- Also update ethtool logic
Signed-off-by: Bailey Forrest <bcf@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Catherine Sullivan <csully@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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