When processing packets within the rx-flow
ena_netmap_rx_load_desc doesn't know the number of descriptors, so it
sets NS_MOREFRAG to all the slots to indicate that there are more
fragments for this packet.
The code calls ena_netmap_rx_load_desc() for every descriptor in
this packet to map the relevant buffer into the netmap shared memory.
After ena_netmap_rx_load_desc() calls, we need to unset the NS_MOREFRAG
for the last fragment to indicate that this is the last fragment,
so we explicitly turn off NS_MOREFRAG flag.
Current code overrides all other flags and sets NS_BUF_CHANGED.
This patch unsets the relevant flag only.

Approved by: cperciva (mentor)
Sponsored by: Amazon, Inc.

(cherry picked from commit 2f17afd19a3534dc1755c52edb0c2f70ea0eb1e4)

Netmap index wraps around based on the number of netmap kernel ring
slots.
Currently the driver prefetches the next slot using nm_i + 1 which may
be wrong since it does not handle wrap around.
This patch fixes that by using the kernel API for fetching the next
netmap index.

Approved by: cperciva (mentor)
Sponsored by: Amazon, Inc.

(cherry picked from commit ce20b51cb71bfb548fcaafc4bacb8290460f03d5)

In case ena_com_prepare_tx() fails within the netmap tx flow,
the driver will unmap the last socket chain.
Currently, the driver unmaps the wrong socket within
ena_netmap_unmap_last_socket_chain().

Illustration of the flow:

1- ena_netmap_tx_frames()
2- ena_netmap_tx_frame()
3- ena_netmap_tx_map_slots()
3.1- Map slot
3.2- Advance to the next socket
4- ena_com_prepare_tx()
4.1- ena_com_prepare_tx() fails
5- ena_netmap_unmap_last_socket_chain()

In step 5, where the driver unmaps the socket, the netmap
index already points at the next entry, meaning we're unmapping the
wrong socket in case ena_com_prepare_tx() fails.
In order to fix that, the driver should first update the netmap index to
point at the previous entry and only then update the socket parameters.

Approved by: cperciva (mentor)
Sponsored by: Amazon, Inc.

(cherry picked from commit f236e544a2ff685ae151f3232e3785a6a9aab035)

RX completion descriptors may sometimes contain errors due
to corruption. Upon identifying such a case, the driver will
trigger a reset with an explicit reset reason
ENA_REGS_RESET_RX_DESCRIPTOR_MALFORMED.

Approved by: cperciva (mentor)
Sponsored by: Amazon, Inc.

(cherry picked from commit 4af71159db3cd4a37055b2b3d982ec53703c5c3d)

TX completion descriptors may sometimes contain errors due
to corruption. Upon identifying such a case, the driver will
trigger a reset with an explicit reset reason
ENA_REGS_RESET_TX_DESCRIPTOR_MALFORMED.

Approved by: cperciva (mentor)
Sponsored by: Amazon, Inc.

(cherry picked from commit 38727218460008a500fbc18f08c90082ed678895)

This commit updates all the license signatures to 2024.

Approved by: cperciva (mentor)
Sponsored by: Amazon, Inc.

(cherry picked from commit 8d6806cd08c093fc001db1f94cf122368b8d1549)

Some of the files are using outdated linceses.
Update the license to be 2023.

Approved by: cperciva (mentor)
MFC after: 2 weeks
Sponsored by: Amazon, Inc.

(cherry picked from commit 246aa273244e91a30d70997a3be790a29f9eb29c)

This commit removes the usage of this API from the freebsd driver since
the relevant functionality is not supported by the device.

Approved by: cperciva (mentor)
MFC after: 2 weeks
Sponsored by: Amazon, Inc.

(cherry picked from commit 2835752e075f2fa3edcb596df8306c570ec4cae6)

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

Reviewed by: mw
Differential Revision: https://reviews.freebsd.org/D37837