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