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Merge tag 'net-queue-rx-buf-len-v9' of https://github.com/isilence/linux

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Pavel Begunkov says:

====================
Add support for providers with large rx buffer

Many modern NICs support configurable receive buffer lengths, and zcrx and
memory providers can use buffers larger than 4K to improve performance.
When paired with hw-gro larger rx buffer sizes can drastically reduce
the number of buffers traversing the stack and save a lot of processing
time. It also allows to give to users larger contiguous chunks of data.

Single stream benchmarks showed up to ~30% CPU util improvement.
E.g. comparison for 4K vs 32K buffers using a 200Gbit NIC:

packets=23987040 (MB=2745098), rps=199559 (MB/s=22837)
CPU    %usr   %nice    %sys %iowait    %irq   %soft   %idle
  0    1.53    0.00   27.78    2.72    1.31   66.45    0.22
packets=24078368 (MB=2755550), rps=200319 (MB/s=22924)
CPU    %usr   %nice    %sys %iowait    %irq   %soft   %idle
  0    0.69    0.00    8.26   31.65    1.83   57.00    0.57

This series adds net infrastructure for memory providers configuring
the size and implements it for bnxt. It's an opt-in feature for drivers,
they should advertise support for the parameter in the qops and must check
if the hardware supports the given size. It's limited to memory providers
as it drastically simplifies implementation. It doesn't affect the fast
path zcrx uAPI, and the user exposed parameter is defined in zcrx terms,
which allows it to be flexible and adjusted in the future.

A liburing example can be found at [2]

full branch:
[1] https://github.com/isilence/linux.git zcrx/large-buffers-v8
Liburing example:
[2] https://github.com/isilence/liburing.git zcrx/rx-buf-len

* tag 'net-queue-rx-buf-len-v9' of https://github.com/isilence/linux:
  io_uring/zcrx: document area chunking parameter
  selftests: iou-zcrx: test large chunk sizes
  eth: bnxt: support qcfg provided rx page size
  eth: bnxt: adjust the fill level of agg queues with larger buffers
  eth: bnxt: store rx buffer size per queue
  net: pass queue rx page size from memory provider
  net: add bare bone queue configs
  net: reduce indent of struct netdev_queue_mgmt_ops members
  net: memzero mp params when closing a queue
====================

Link: https://patch.msgid.link/
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski
2026-01-20 18:10:04 -08:00
parent 8766d61a1d d1de61db15
commit 677a51790b
16 changed files with 317 additions and 79 deletions
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17
net/core/dev.c
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@@ -11282,6 +11282,21 @@ static void netdev_free_phy_link_topology(struct net_device *dev)
}
}
static void init_rx_queue_cfgs(struct net_device *dev)
{
const struct netdev_queue_mgmt_ops *qops = dev->queue_mgmt_ops;
struct netdev_rx_queue *rxq;
int i;
if (!qops || !qops->ndo_default_qcfg)
return;
for (i = 0; i < dev->num_rx_queues; i++) {
rxq = __netif_get_rx_queue(dev, i);
qops->ndo_default_qcfg(dev, &rxq->qcfg);
}
}
/**
* register_netdevice() - register a network device
* @dev: device to register
@@ -11327,6 +11342,8 @@ int register_netdevice(struct net_device *dev)
if (!dev->name_node)
goto out;
init_rx_queue_cfgs(dev);
/* Init, if this function is available */
if (dev->netdev_ops->ndo_init) {
ret = dev->netdev_ops->ndo_init(dev);