[openib-general] [PATCH] [RMPP] receive RMPP support

[Sean Hefty]

On a separate note, I'd like to solicit comments about exposing the
following (with slight modifications), in ib_verbs.h, ib_mad.h, and/or
ib_mad_helper.h.

- Sean

>+struct rmpp_msg {
>+	struct ib_mad_agent *mad_agent;
>+	struct ib_send_wr send_wr;
>+	struct ib_sge sge;
>+	DECLARE_PCI_UNMAP_ADDR(mapping)
>+	struct ib_rmpp_mad mad;
>+};
>+
>+static struct ib_ah * create_ah_from_wc(struct ib_pd *pd, struct ib_wc
>*wc,
>+					u8 port_num)
>+{
>+	struct ib_ah_attr *ah_attr;
>+	struct ib_ah *ah;
>+
>+	ah_attr = kmalloc(sizeof *ah_attr, GFP_KERNEL);
>+	if (!ah_attr)
>+		return ERR_PTR(-ENOMEM);
>+
>+	memset(ah_attr, 0, sizeof *ah_attr);
>+	ah_attr->dlid = wc->slid;
>+	ah_attr->sl = wc->sl;
>+	ah_attr->src_path_bits = wc->dlid_path_bits;
>+	ah_attr->port_num = port_num;
>+
>+	ah = ib_create_ah(pd, ah_attr);
>+	kfree(ah_attr);
>+	return ah;
>+}
>+
>+static struct rmpp_msg * alloc_rmpp_msg(struct ib_mad_agent *mad_agent,
>+					u32 remote_qpn, u16 pkey_index,
>+					struct ib_ah *ah)
>+{
>+	struct rmpp_msg *msg;
>+
>+	msg = kmalloc(sizeof *msg, GFP_KERNEL);
>+	if (!msg)
>+		return NULL;
>+	memset(msg, 0, sizeof *msg);
>+
>+	msg->sge.addr = dma_map_single(mad_agent->device->dma_device,
>+				       &msg->mad, sizeof msg->mad,
>+				       DMA_TO_DEVICE);
>+	pci_unmap_addr_set(msg, mapping, msg->sge.addr);
>+	msg->sge.length = sizeof msg->mad;
>+	msg->sge.lkey = mad_agent->mr->lkey;
>+
>+	msg->send_wr.wr_id = (unsigned long) msg;
>+	msg->send_wr.sg_list = &msg->sge;
>+	msg->send_wr.num_sge = 1;
>+	msg->send_wr.opcode = IB_WR_SEND;
>+	msg->send_wr.send_flags = IB_SEND_SIGNALED;
>+	msg->send_wr.wr.ud.ah = ah;
>+	msg->send_wr.wr.ud.mad_hdr = &msg->mad.mad_hdr;
>+	msg->send_wr.wr.ud.remote_qpn = remote_qpn;
>+	msg->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
>+	msg->send_wr.wr.ud.pkey_index = pkey_index;
>+
>+	msg->mad_agent = mad_agent;
>+	return msg;
>+}
>+
>+static void free_rmpp_msg(struct rmpp_msg *msg)
>+{
>+	dma_unmap_single(msg->mad_agent->device->dma_device,
>+			 pci_unmap_addr(msg, mapping),
>+			 sizeof msg->mad, DMA_TO_DEVICE);
>+	kfree(msg);