Add new helper routines for allocating MADs for sending and formatting
a send WR.
Signed-off-by: Sean Hefty <[email protected]>
Signed-off-by: Hal Rosenstock <[email protected]>
This patch depends on patch 2/27.
--
core/mad.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
include/ib_mad.h | 60 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 136 insertions(+)
diff -uprN linux-2.6.13-rc2-mm1/drivers/infiniband2/core/mad.c linux-2.6.13-rc2-mm1/drivers/infiniband3/core/mad.c
-- linux-2.6.13-rc2-mm1/drivers/infiniband2/core/mad.c 2005-07-09 12:58:23.000000000 -0400
+++ linux-2.6.13-rc2-mm1/drivers/infiniband3/core/mad.c 2005-07-09 14:31:49.000000000 -0400
@@ -763,6 +763,82 @@ out:
return ret;
}
+static int get_buf_length(int hdr_len, int data_len)
+{
+ int seg_size, pad;
+
+ seg_size = sizeof(struct ib_mad) - hdr_len;
+ if (data_len && seg_size) {
+ pad = seg_size - data_len % seg_size;
+ if (pad == seg_size)
+ pad = 0;
+ } else
+ pad = seg_size;
+ return hdr_len + data_len + pad;
+}
+
+struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
+ u32 remote_qpn, u16 pkey_index,
+ struct ib_ah *ah,
+ int hdr_len, int data_len,
+ int gfp_mask)
+{
+ struct ib_mad_agent_private *mad_agent_priv;
+ struct ib_mad_send_buf *send_buf;
+ int buf_size;
+ void *buf;
+
+ mad_agent_priv = container_of(mad_agent,
+ struct ib_mad_agent_private, agent);
+ buf_size = get_buf_length(hdr_len, data_len);
+
+ buf = kmalloc(sizeof *send_buf + buf_size, gfp_mask);
+ if (!buf)
+ return ERR_PTR(-ENOMEM);
+
+ send_buf = buf + buf_size;
+ memset(send_buf, 0, sizeof *send_buf);
+ send_buf->mad = buf;
+
+ send_buf->sge.addr = dma_map_single(mad_agent->device->dma_device,
+ buf, buf_size, DMA_TO_DEVICE);
+ pci_unmap_addr_set(send_buf, mapping, send_buf->sge.addr);
+ send_buf->sge.length = buf_size;
+ send_buf->sge.lkey = mad_agent->mr->lkey;
+
+ send_buf->send_wr.wr_id = (unsigned long) send_buf;
+ send_buf->send_wr.sg_list = &send_buf->sge;
+ send_buf->send_wr.num_sge = 1;
+ send_buf->send_wr.opcode = IB_WR_SEND;
+ send_buf->send_wr.send_flags = IB_SEND_SIGNALED;
+ send_buf->send_wr.wr.ud.ah = ah;
+ send_buf->send_wr.wr.ud.mad_hdr = &send_buf->mad->mad_hdr;
+ send_buf->send_wr.wr.ud.remote_qpn = remote_qpn;
+ send_buf->send_wr.wr.ud.remote_qkey = IB_QP_SET_QKEY;
+ send_buf->send_wr.wr.ud.pkey_index = pkey_index;
+ send_buf->mad_agent = mad_agent;
+ atomic_inc(&mad_agent_priv->refcount);
+ return send_buf;
+}
+EXPORT_SYMBOL(ib_create_send_mad);
+
+void ib_free_send_mad(struct ib_mad_send_buf *send_buf)
+{
+ struct ib_mad_agent_private *mad_agent_priv;
+
+ mad_agent_priv = container_of(send_buf->mad_agent,
+ struct ib_mad_agent_private, agent);
+
+ dma_unmap_single(send_buf->mad_agent->device->dma_device,
+ pci_unmap_addr(send_buf, mapping),
+ send_buf->sge.length, DMA_TO_DEVICE);
+ kfree(send_buf->mad);
+
+ if (atomic_dec_and_test(&mad_agent_priv->refcount))
+ wake_up(&mad_agent_priv->wait);
+}
+EXPORT_SYMBOL(ib_free_send_mad);
+
static int ib_send_mad(struct ib_mad_agent_private *mad_agent_priv,
struct ib_mad_send_wr_private *mad_send_wr)
{
diff -uprN linux-2.6.13-rc2-mm1/drivers/infiniband2/include/ib_mad.h linux-2.6.13-rc2-mm1/drivers/infiniband3/include/ib_mad.h
-- linux-2.6.13-rc2-mm1/drivers/infiniband2/include/ib_mad.h 2005-07-09 12:06:49.000000000 -0400
+++ linux-2.6.13-rc2-mm1/drivers/infiniband3/include/ib_mad.h 2005-07-09 14:26:49.000000000 -0400
@@ -39,6 +39,8 @@
#if !defined( IB_MAD_H )
#define IB_MAD_H
+#include <linux/pci.h>
+
#include <ib_verbs.h>
/* Management base version */
@@ -73,6 +75,7 @@
#define IB_QP0 0
#define IB_QP1 __constant_htonl(1)
#define IB_QP1_QKEY 0x80010000
+#define IB_QP_SET_QKEY 0x80000000
struct ib_grh {
u32 version_tclass_flow;
@@ -124,6 +127,30 @@ struct ib_vendor_mad {
u8 data[216];
} __attribute__ ((packed));
+/**
+ * ib_mad_send_buf - MAD data buffer and work request for sends.
+ * @mad: References an allocated MAD data buffer. The size of the data
+ * buffer is specified in the @send_wr.length field.
+ * @mapping: DMA mapping information.
+ * @mad_agent: MAD agent that allocated the buffer.
+ * @context: User-controlled context fields.
+ * @send_wr: An initialized work request structure used when sending the MAD.
+ * The wr_id field of the work request is initialized to reference this
+ * data structure.
+ * @sge: A scatter-gather list referenced by the work request.
+ *
+ * Users are responsible for initializing the MAD buffer itself, with the
+ * exception of specifying the payload length field in any RMPP MAD.
+ */
+struct ib_mad_send_buf {
+ struct ib_mad *mad;
+ DECLARE_PCI_UNMAP_ADDR(mapping)
+ struct ib_mad_agent *mad_agent;
+ void *context[2];
+ struct ib_send_wr send_wr;
+ struct ib_sge sge;
+};
+
struct ib_mad_agent;
struct ib_mad_send_wc;
struct ib_mad_recv_wc;
@@ -402,4 +429,37 @@ struct ib_mad_agent *ib_redirect_mad_qp(
int ib_process_mad_wc(struct ib_mad_agent *mad_agent,
struct ib_wc *wc);
+/**
+ * ib_create_send_mad - Allocate and initialize a data buffer and work request
+ * for sending a MAD.
+ * @mad_agent: Specifies the registered MAD service to associate with the MAD.
+ * @remote_qpn: Specifies the QPN of the receiving node.
+ * @pkey_index: Specifies which PKey the MAD will be sent using. This field
+ * is valid only if the remote_qpn is QP 1.
+ * @ah: References the address handle used to transfer to the remote node.
+ * @hdr_len: Indicates the size of the data header of the MAD. This length
+ * should include the common MAD header, RMPP header, plus any class
+ * specific header.
+ * @data_len: Indicates the size of any user-transfered data. The call will
+ * automatically adjust the allocated buffer size to account for any
+ * additional padding that may be necessary.
+ * @gfp_mask: GFP mask used for the memory allocation.
+ *
+ * This is a helper routine that may be used to allocate a MAD. Users are
+ * not required to allocate outbound MADs using this call. The returned
+ * MAD send buffer will reference a data buffer usable for sending a MAD, along
+ * with an intialized work request structure.
+ */
+struct ib_mad_send_buf * ib_create_send_mad(struct ib_mad_agent *mad_agent,
+ u32 remote_qpn, u16 pkey_index,
+ struct ib_ah *ah,
+ int hdr_len, int data_len,
+ int gfp_mask);
+
+/**
+ * ib_free_send_mad - Returns data buffers used to send a MAD.
+ * @send_buf: Previously allocated send data buffer.
+ */
+void ib_free_send_mad(struct ib_mad_send_buf *send_buf);
+
#endif /* IB_MAD_H */
-
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