drivers/infiniband/hw/hns/hns_roce_ah.c

Source file repositories/reference/linux-study-clean/drivers/infiniband/hw/hns/hns_roce_ah.c

File Facts

System
Linux kernel
Corpus path
drivers/infiniband/hw/hns/hns_roce_ah.c
Extension
.c
Size
4241 bytes
Lines
141
Domain
Driver Families
Bucket
drivers/infiniband
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <rdma/ib_addr.h>
#include <rdma/ib_cache.h>
#include <rdma/uverbs_ioctl.h>
#include "hns_roce_device.h"
#include "hns_roce_hw_v2.h"

static inline u16 get_ah_udp_sport(const struct rdma_ah_attr *ah_attr)
{
	u32 fl = ah_attr->grh.flow_label;
	u16 sport;

	if (!fl)
		sport = get_random_u32_inclusive(IB_ROCE_UDP_ENCAP_VALID_PORT_MIN,
						 IB_ROCE_UDP_ENCAP_VALID_PORT_MAX);
	else
		sport = rdma_flow_label_to_udp_sport(fl);

	return sport;
}

int hns_roce_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr,
		       struct ib_udata *udata)
{
	struct rdma_ah_attr *ah_attr = init_attr->ah_attr;
	const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
	struct hns_roce_dev *hr_dev = to_hr_dev(ibah->device);
	struct hns_roce_ib_create_ah_resp resp = {};
	struct hns_roce_ah *ah = to_hr_ah(ibah);
	u8 tclass = get_tclass(grh);
	u8 priority = 0;
	u8 tc_mode = 0;
	int ret = 0;

	if (hr_dev->pci_dev->revision == PCI_REVISION_ID_HIP08 && udata) {
		ret = -EOPNOTSUPP;
		goto err_out;
	}

	ah->av.port = rdma_ah_get_port_num(ah_attr);
	ah->av.gid_index = grh->sgid_index;

	if (rdma_ah_get_static_rate(ah_attr))
		ah->av.stat_rate = IB_RATE_10_GBPS;

	ah->av.hop_limit = grh->hop_limit;
	ah->av.flowlabel = grh->flow_label;
	ah->av.udp_sport = get_ah_udp_sport(ah_attr);
	ah->av.tclass = tclass;
	ah->av.sl = rdma_ah_get_sl(ah_attr);

	if (grh->sgid_attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
		ret = hr_dev->hw->get_dscp(hr_dev, tclass, &tc_mode, &priority);
		if (ret == -EOPNOTSUPP)
			ret = 0;
		else if (ret)
			goto err_out;

		if (tc_mode == HNAE3_TC_MAP_MODE_DSCP)
			ah->av.sl = priority;
	}

	if (!check_sl_valid(hr_dev, ah->av.sl)) {
		ret = -EINVAL;
		goto err_out;
	}

	memcpy(ah->av.dgid, grh->dgid.raw, HNS_ROCE_GID_SIZE);
	memcpy(ah->av.mac, ah_attr->roce.dmac, ETH_ALEN);

	/* HIP08 needs to record vlan info in Address Vector */
	if (hr_dev->pci_dev->revision == PCI_REVISION_ID_HIP08) {
		ret = rdma_read_gid_l2_fields(ah_attr->grh.sgid_attr,
					      &ah->av.vlan_id, NULL);
		if (ret)
			goto err_out;

		ah->av.vlan_en = ah->av.vlan_id < VLAN_N_VID;
	}

	if (udata) {
		resp.priority = ah->av.sl;
		resp.tc_mode = tc_mode;
		memcpy(resp.dmac, ah_attr->roce.dmac, ETH_ALEN);
		ret = ib_respond_udata(udata, resp);
	}

err_out:
	if (ret)
		atomic64_inc(&hr_dev->dfx_cnt[HNS_ROCE_DFX_AH_CREATE_ERR_CNT]);

Annotation

Implementation Notes