Commit 824c8ae7 authored by Hal Rosenstock's avatar Hal Rosenstock Committed by Linus Torvalds
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[PATCH] IB: Add MAD helper functions

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

Signed-off-by: default avatarSean Hefty <>
Signed-off-by: default avatarHal Rosenstock <>
Cc: Roland Dreier <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent b82cab6b
......@@ -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;
return send_buf;
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);
pci_unmap_addr(send_buf, mapping),
send_buf->sge.length, DMA_TO_DEVICE);
if (atomic_dec_and_test(&mad_agent_priv->refcount))
static int ib_send_mad(struct ib_mad_agent_private *mad_agent_priv,
struct ib_mad_send_wr_private *mad_send_wr)
......@@ -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;
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 */
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