gve: pull network headers into skb linear part

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Currently, in DQO mode with hw-gro enabled, entire received packet is
placed into skb fragments when header-split is disabled. This leaves
the skb linear part empty, forcing the networking stack to do multiple
small memory copies to access eth, IP and TCP headers.

This patch adds a single memcpy to put all headers into linear portion
before packet reaches the SW GRO stack; thus eliminating multiple
smaller memcpy calls.

Additionally, the criteria for calling napi_gro_frags() was updated.
Since skb->head is now populated, we instead check if the SKB is the
cached NAPI scratchpad to ensure we continue using the zero-allocation
path.

Signed-off-by: Ankit Garg <nktgrg@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Harshitha Ramamurthy <hramamurthy@google.com>
Signed-off-by: Joshua Washington <joshwash@google.com>
Link: https://patch.msgid.link/20260303195549.2679070-4-joshwash@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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This commit is contained in:

Ankit Garg 2026-03-03 11:55:48 -08:00 • committed by Paolo Abeni

parent ea4c117687

commit 0c7025fd24

1 changed files with 16 additions and 4 deletions

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20

drivers/net/ethernet/google/gve/gve_rx_dqo.c

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