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xilinx axi ethernet: allocate memory for buffers.

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The xae(9) driver expects that the "memory-region" property is always
provided in its DTS node, but this is not a case for every platform.

If the property is not provided, then no restriction on buffer location
is in place and busdma backend could be used.

Since the Xilinx AXI DMA engine driver does not support busdma(9), then
allocate some memory for buffers manually, so we don't panic.

This fixes operation on Codasip A730.
This commit is contained in:
Ruslan Bukin 2025-03-26 14:52:29 +00:00
parent c11b701915
commit 3969b51ffa
1 changed files with 18 additions and 4 deletions
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22
sys/dev/xilinx/if_xae.c
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@ -1,7 +1,7 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Ruslan Bukin <br@bsdpad.com>
* Copyright (c) 2019-2025 Ruslan Bukin <br@bsdpad.com>
*
* This software was developed by SRI International and the University of
* Cambridge Computer Laboratory (Department of Computer Science and
@ -43,6 +43,9 @@
#include <sys/socket.h>
#include <sys/sockio.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
#include <net/bpf.h>
#include <net/if.h>
#include <net/ethernet.h>
@ -94,6 +97,7 @@
#define NUM_RX_MBUF 16
#define BUFRING_SIZE 8192
#define MDIO_CLK_DIV_DEFAULT 29
#define BUF_NPAGES 512
#define PHY1_RD(sc, _r) \
xae_miibus_read_reg(sc->dev, 1, _r)
@ -834,6 +838,8 @@ setup_xdma(struct xae_softc *sc)
{
device_t dev;
vmem_t *vmem;
vm_paddr_t phys;
vm_page_t m;
int error;
dev = sc->dev;
@ -886,11 +892,19 @@ setup_xdma(struct xae_softc *sc)
/* Setup bounce buffer */
vmem = xdma_get_memory(dev);
if (vmem) {
xchan_set_memory(sc->xchan_tx, vmem);
xchan_set_memory(sc->xchan_rx, vmem);
if (!vmem) {
m = vm_page_alloc_noobj_contig(VM_ALLOC_WIRED | VM_ALLOC_ZERO,
BUF_NPAGES, 0, BUS_SPACE_MAXADDR_32BIT, PAGE_SIZE, 0,
VM_MEMATTR_DEFAULT);
phys = VM_PAGE_TO_PHYS(m);
vmem = vmem_create("xdma vmem", 0, 0, PAGE_SIZE, PAGE_SIZE,
M_BESTFIT | M_WAITOK);
vmem_add(vmem, phys, BUF_NPAGES * PAGE_SIZE, 0);
}
xchan_set_memory(sc->xchan_tx, vmem);
xchan_set_memory(sc->xchan_rx, vmem);
xdma_prep_sg(sc->xchan_tx,
TX_QUEUE_SIZE, /* xchan requests queue size */
MCLBYTES, /* maxsegsize */