[openib-general] [PATCH][RFC/v2][14/21] Add Mellanox HCA low-level driver (MAD)
Roland Dreier
roland at topspin.com
Tue Nov 23 08:15:46 PST 2004
Add MAD (management datagram) code for Mellanox HCA driver.
Signed-off-by: Roland Dreier <roland at topspin.com>
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-bk/drivers/infiniband/hw/mthca/mthca_mad.c 2004-11-23 08:10:21.738357057 -0800
@@ -0,0 +1,321 @@
+/*
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available at
+ * <http://www.fsf.org/copyleft/gpl.html>, or the OpenIB.org BSD
+ * license, available in the LICENSE.TXT file accompanying this
+ * software. These details are also available at
+ * <http://openib.org/license.html>.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Copyright (c) 2004 Topspin Communications. All rights reserved.
+ *
+ * $Id: mthca_mad.c 1190 2004-11-10 17:12:44Z roland $
+ */
+
+#include <ib_verbs.h>
+#include <ib_mad.h>
+
+#include "mthca_dev.h"
+#include "mthca_cmd.h"
+
+enum {
+ IB_SM_PORT_INFO = 0x0015,
+ IB_SM_PKEY_TABLE = 0x0016,
+ IB_SM_SM_INFO = 0x0020,
+ IB_SM_VENDOR_START = 0xff00
+};
+
+enum {
+ MTHCA_VENDOR_CLASS1 = 0x9,
+ MTHCA_VENDOR_CLASS2 = 0xa
+};
+
+struct mthca_trap_mad {
+ struct ib_mad *mad;
+ DECLARE_PCI_UNMAP_ADDR(mapping)
+};
+
+static void update_sm_ah(struct mthca_dev *dev,
+ u8 port_num, u16 lid, u8 sl)
+{
+ struct ib_ah *new_ah;
+ struct ib_ah_attr ah_attr;
+ unsigned long flags;
+
+ if (!dev->send_agent[port_num - 1][0])
+ return;
+
+ memset(&ah_attr, 0, sizeof ah_attr);
+ ah_attr.dlid = lid;
+ ah_attr.sl = sl;
+ ah_attr.port_num = port_num;
+
+ new_ah = ib_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
+ &ah_attr);
+ if (IS_ERR(new_ah))
+ return;
+
+ spin_lock_irqsave(&dev->sm_lock, flags);
+ if (dev->sm_ah[port_num - 1])
+ ib_destroy_ah(dev->sm_ah[port_num - 1]);
+ dev->sm_ah[port_num - 1] = new_ah;
+ spin_unlock_irqrestore(&dev->sm_lock, flags);
+}
+
+/*
+ * Snoop SM MADs for port info and P_Key table sets, so we can
+ * synthesize LID change and P_Key change events.
+ */
+static void smp_snoop(struct ib_device *ibdev,
+ u8 port_num,
+ struct ib_mad *mad)
+{
+ struct ib_event event;
+
+ if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
+ mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
+ mad->mad_hdr.method == IB_MGMT_METHOD_SET) {
+ if (mad->mad_hdr.attr_id == cpu_to_be16(IB_SM_PORT_INFO)) {
+ update_sm_ah(to_mdev(ibdev), port_num,
+ be16_to_cpup((__be16 *) (mad->data + 58)),
+ (*(u8 *) (mad->data + 76)) & 0xf);
+
+ event.device = ibdev;
+ event.event = IB_EVENT_LID_CHANGE;
+ event.element.port_num = port_num;
+ ib_dispatch_event(&event);
+ }
+
+ if (mad->mad_hdr.attr_id == cpu_to_be16(IB_SM_PKEY_TABLE)) {
+ event.device = ibdev;
+ event.event = IB_EVENT_PKEY_CHANGE;
+ event.element.port_num = port_num;
+ ib_dispatch_event(&event);
+ }
+ }
+}
+
+static void forward_trap(struct mthca_dev *dev,
+ u8 port_num,
+ struct ib_mad *mad)
+{
+ int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
+ struct mthca_trap_mad *tmad;
+ struct ib_sge gather_list;
+ struct ib_send_wr *bad_wr, wr = {
+ .opcode = IB_WR_SEND,
+ .sg_list = &gather_list,
+ .num_sge = 1,
+ .send_flags = IB_SEND_SIGNALED,
+ .wr = {
+ .ud = {
+ .remote_qpn = qpn,
+ .remote_qkey = qpn ? IB_QP1_QKEY : 0,
+ .timeout_ms = 0
+ }
+ }
+ };
+ struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
+ int ret;
+ unsigned long flags;
+
+ if (agent) {
+ tmad = kmalloc(sizeof *tmad, GFP_KERNEL);
+ if (!tmad)
+ return;
+
+ tmad->mad = kmalloc(sizeof *tmad->mad, GFP_KERNEL);
+ if (!tmad->mad) {
+ kfree(tmad);
+ return;
+ }
+
+ memcpy(tmad->mad, mad, sizeof *mad);
+
+ wr.wr.ud.mad_hdr = &tmad->mad->mad_hdr;
+ wr.wr_id = (unsigned long) tmad;
+
+ gather_list.addr = dma_map_single(agent->device->dma_device,
+ tmad->mad,
+ sizeof *tmad->mad,
+ DMA_TO_DEVICE);
+ gather_list.length = sizeof *tmad->mad;
+ gather_list.lkey = to_mpd(agent->qp->pd)->ntmr.ibmr.lkey;
+ pci_unmap_addr_set(tmad, mapping, gather_list.addr);
+
+ /*
+ * We rely here on the fact that MLX QPs don't use the
+ * address handle after the send is posted (this is
+ * wrong following the IB spec strictly, but we know
+ * it's OK for our devices).
+ */
+ spin_lock_irqsave(&dev->sm_lock, flags);
+ wr.wr.ud.ah = dev->sm_ah[port_num - 1];
+ if (wr.wr.ud.ah)
+ ret = ib_post_send_mad(agent, &wr, &bad_wr);
+ else
+ ret = -EINVAL;
+ spin_unlock_irqrestore(&dev->sm_lock, flags);
+
+ if (ret) {
+ dma_unmap_single(agent->device->dma_device,
+ pci_unmap_addr(tmad, mapping),
+ sizeof *tmad->mad,
+ DMA_TO_DEVICE);
+ kfree(tmad->mad);
+ kfree(tmad);
+ }
+ }
+}
+
+int mthca_process_mad(struct ib_device *ibdev,
+ int mad_flags,
+ u8 port_num,
+ u16 slid,
+ struct ib_mad *in_mad,
+ struct ib_mad *out_mad)
+{
+ int err;
+ u8 status;
+
+ /* Forward locally generated traps to the SM */
+ if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP &&
+ slid == 0) {
+ forward_trap(to_mdev(ibdev), port_num, in_mad);
+ return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
+ }
+
+ /*
+ * Only handle SM gets, sets and trap represses for SM class
+ *
+ * Only handle PMA and Mellanox vendor-specific class gets and
+ * sets for other classes.
+ */
+ if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
+ in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
+ if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
+ in_mad->mad_hdr.method != IB_MGMT_METHOD_SET &&
+ in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS)
+ return IB_MAD_RESULT_SUCCESS;
+
+ /*
+ * Don't process SMInfo queries or vendor-specific
+ * MADs -- the SMA can't handle them.
+ */
+ if (be16_to_cpu(in_mad->mad_hdr.attr_id) == IB_SM_SM_INFO ||
+ be16_to_cpu(in_mad->mad_hdr.attr_id) >= IB_SM_VENDOR_START)
+ return IB_MAD_RESULT_SUCCESS;
+ } else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
+ in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS1 ||
+ in_mad->mad_hdr.mgmt_class == MTHCA_VENDOR_CLASS2) {
+ if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
+ in_mad->mad_hdr.method != IB_MGMT_METHOD_SET)
+ return IB_MAD_RESULT_SUCCESS;
+ } else
+ return IB_MAD_RESULT_SUCCESS;
+
+ err = mthca_MAD_IFC(to_mdev(ibdev),
+ !!(mad_flags & IB_MAD_IGNORE_MKEY),
+ port_num, in_mad, out_mad,
+ &status);
+ if (err) {
+ mthca_err(to_mdev(ibdev), "MAD_IFC failed\n");
+ return IB_MAD_RESULT_FAILURE;
+ }
+ if (status == MTHCA_CMD_STAT_BAD_PKT)
+ return IB_MAD_RESULT_SUCCESS;
+ if (status) {
+ mthca_err(to_mdev(ibdev), "MAD_IFC returned status %02x\n",
+ status);
+ return IB_MAD_RESULT_FAILURE;
+ }
+
+ if (!out_mad->mad_hdr.status)
+ smp_snoop(ibdev, port_num, in_mad);
+
+ /* set return bit in status of directed route responses */
+ if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
+ out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
+
+ if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
+ /* no response for trap repress */
+ return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
+
+ return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
+}
+
+static void send_handler(struct ib_mad_agent *agent,
+ struct ib_mad_send_wc *mad_send_wc)
+{
+ struct mthca_trap_mad *tmad =
+ (void *) (unsigned long) mad_send_wc->wr_id;
+
+ dma_unmap_single(agent->device->dma_device,
+ pci_unmap_addr(tmad, mapping),
+ sizeof *tmad->mad,
+ DMA_TO_DEVICE);
+ kfree(tmad->mad);
+ kfree(tmad);
+}
+
+int mthca_create_agents(struct mthca_dev *dev)
+{
+ struct ib_mad_agent *agent;
+ int p, q;
+
+ spin_lock_init(&dev->sm_lock);
+
+ for (p = 0; p < dev->limits.num_ports; ++p)
+ for (q = 0; q <= 1; ++q) {
+ agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
+ q ? IB_QPT_GSI : IB_QPT_SMI,
+ NULL, 0, send_handler,
+ NULL, NULL);
+ if (IS_ERR(agent))
+ goto err;
+ dev->send_agent[p][q] = agent;
+ }
+
+ return 0;
+
+err:
+ for (p = 0; p < dev->limits.num_ports; ++p)
+ for (q = 0; q <= 1; ++q)
+ if (dev->send_agent[p][q])
+ ib_unregister_mad_agent(dev->send_agent[p][q]);
+
+ return PTR_ERR(agent);
+}
+
+void mthca_free_agents(struct mthca_dev *dev)
+{
+ struct ib_mad_agent *agent;
+ int p, q;
+
+ for (p = 0; p < dev->limits.num_ports; ++p) {
+ for (q = 0; q <= 1; ++q) {
+ agent = dev->send_agent[p][q];
+ dev->send_agent[p][q] = NULL;
+ ib_unregister_mad_agent(agent);
+ }
+
+ if (dev->sm_ah[p])
+ ib_destroy_ah(dev->sm_ah[p]);
+ }
+}
+
+/*
+ * Local Variables:
+ * c-file-style: "linux"
+ * indent-tabs-mode: t
+ * End:
+ */
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