diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/infiniband/core/mad.c | 76 | ||||
| -rw-r--r-- | drivers/infiniband/include/ib_mad.h | 60 |
2 files changed, 136 insertions, 0 deletions
diff --git a/drivers/infiniband/core/mad.c b/drivers/infiniband/core/mad.c index 52748b0f768..d66ecf8243e 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 60378c1a9cc..a6f06b8c4ac 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 */ |