[PATCH] IB: Add MAD helper functions

Add new helper routines for allocating MADs for sending and formatting a send
WR.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Hal Rosenstock <halr@voltaire.com>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 136 insertions, 0 deletions

diff --git a/drivers/infiniband/core/mad.c b/drivers/infiniband/core/mad.c
index 52748b0f7685..d66ecf8243ec 100644
--- a/drivers/infiniband/core/mad.c
+++ b/drivers/infiniband/core/mad.c
@@ -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,
+                                            unsigned int __nocast 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 --git a/drivers/infiniband/include/ib_mad.h b/drivers/infiniband/include/ib_mad.h
index 60378c1a9ccf..a6f06b8c4acf 100644
--- a/drivers/infiniband/include/ib_mad.h
+++ b/drivers/infiniband/include/ib_mad.h
@@ -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(struct ib_qp *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,
+                                            unsigned int __nocast 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 */