static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
struct ipoib_cm_rx_buf *rx_ring,
int id, int frags,
u64 mapping[IPOIB_CM_RX_SG])
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct sk_buff *skb;
int i;
skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
if (unlikely(!skb))
return NULL;
/*
* IPoIB adds a 4 byte header. So we need 12 more bytes to align the
* IP header to a multiple of 16.
*/
skb_reserve(skb, 12);
mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
DMA_FROM_DEVICE);
if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
dev_kfree_skb_any(skb);
return NULL;
}
for (i = 0; i < frags; i++) {
struct page *page = alloc_page(GFP_ATOMIC);
if (!page)
goto partial_error;
skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page,
0, PAGE_SIZE, DMA_FROM_DEVICE);
if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
goto partial_error;
}
rx_ring[id].skb = skb;
return skb;
partial_error:
ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
for (; i > 0; --i)
ib_dma_unmap_single(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
dev_kfree_skb_any(skb);
return NULL;
}
int iser_alloc_rx_descriptors(struct iser_conn *iser_conn,
struct iscsi_session *session)
{
int i, j;
u64 dma_addr;
struct iser_rx_desc *rx_desc;
struct ib_sge *rx_sg;
struct ib_conn *ib_conn = &iser_conn->ib_conn;
struct iser_device *device = ib_conn->device;
iser_conn->qp_max_recv_dtos = session->cmds_max;
iser_conn->qp_max_recv_dtos_mask = session->cmds_max - 1; /* cmds_max is 2^N */
iser_conn->min_posted_rx = iser_conn->qp_max_recv_dtos >> 2;
if (device->iser_alloc_rdma_reg_res(ib_conn, session->scsi_cmds_max))
goto create_rdma_reg_res_failed;
if (iser_alloc_login_buf(iser_conn))
goto alloc_login_buf_fail;
iser_conn->num_rx_descs = session->cmds_max;
iser_conn->rx_descs = kmalloc(iser_conn->num_rx_descs *
sizeof(struct iser_rx_desc), GFP_KERNEL);
if (!iser_conn->rx_descs)
goto rx_desc_alloc_fail;
rx_desc = iser_conn->rx_descs;
for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) {
dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
if (ib_dma_mapping_error(device->ib_device, dma_addr))
goto rx_desc_dma_map_failed;
rx_desc->dma_addr = dma_addr;
rx_sg = &rx_desc->rx_sg;
rx_sg->addr = rx_desc->dma_addr;
rx_sg->length = ISER_RX_PAYLOAD_SIZE;
rx_sg->lkey = device->mr->lkey;
}
iser_conn->rx_desc_head = 0;
return 0;
rx_desc_dma_map_failed:
rx_desc = iser_conn->rx_descs;
for (j = 0; j < i; j++, rx_desc++)
ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
kfree(iser_conn->rx_descs);
iser_conn->rx_descs = NULL;
rx_desc_alloc_fail:
iser_free_login_buf(iser_conn);
alloc_login_buf_fail:
device->iser_free_rdma_reg_res(ib_conn);
create_rdma_reg_res_failed:
iser_err("failed allocating rx descriptors / data buffers\n");
return -ENOMEM;
}
static int rdma_set_ctxt_sge(struct svcxprt_rdma *xprt,
struct svc_rdma_op_ctxt *ctxt,
struct svc_rdma_fastreg_mr *frmr,
struct kvec *vec,
u64 *sgl_offset,
int count)
{
int i;
ctxt->count = count;
ctxt->direction = DMA_FROM_DEVICE;
for (i = 0; i < count; i++) {
ctxt->sge[i].length = 0; /* in case map fails */
if (!frmr) {
ctxt->sge[i].addr =
ib_dma_map_single(xprt->sc_cm_id->device,
vec[i].iov_base,
vec[i].iov_len,
DMA_FROM_DEVICE);
if (ib_dma_mapping_error(xprt->sc_cm_id->device,
ctxt->sge[i].addr))
return -EINVAL;
ctxt->sge[i].lkey = xprt->sc_dma_lkey;
atomic_inc(&xprt->sc_dma_used);
} else {
ctxt->sge[i].addr = (unsigned long)vec[i].iov_base;
ctxt->sge[i].lkey = frmr->mr->lkey;
}
ctxt->sge[i].length = vec[i].iov_len;
*sgl_offset = *sgl_offset + vec[i].iov_len;
}
return 0;
}
struct sk_buff *vnic_alloc_rx_skb(struct vnic_rx_ring *ring, int buf_ind,
gfp_t gfp_flag)
{
struct ib_device *ca = ring->port->dev->ca;
struct sk_buff *skb;
u64 mapping;
int buf_size = VNIC_BUF_SIZE(ring->port);
skb = alloc_skb(buf_size, gfp_flag);
if (!skb) {
vnic_dbg_data(ring->port->name,
"alloc_skb for size %d failed\n", buf_size);
goto err_alloc;
}
mapping = ib_dma_map_single(ca, skb->data, buf_size, DMA_FROM_DEVICE);
if (unlikely(ib_dma_mapping_error(ca, mapping))) {
vnic_dbg_data(ring->port->name,
"ib_dma_map_single len %d failed\n", buf_size);
goto err_map;
}
ring->rx_info[buf_ind].skb = skb;
ring->rx_info[buf_ind].dma_addr[0] = mapping;
return skb;
err_map:
dev_kfree_skb_any(skb);
err_alloc:
return NULL;
}
static int
post_recv(struct p9_client *client, struct p9_rdma_context *c)
{
struct p9_trans_rdma *rdma = client->trans;
struct ib_recv_wr wr;
struct ib_sge sge;
c->busa = ib_dma_map_single(rdma->cm_id->device,
c->rc.sdata, client->msize,
DMA_FROM_DEVICE);
if (ib_dma_mapping_error(rdma->cm_id->device, c->busa))
goto error;
c->cqe.done = recv_done;
sge.addr = c->busa;
sge.length = client->msize;
sge.lkey = rdma->pd->local_dma_lkey;
wr.next = NULL;
wr.wr_cqe = &c->cqe;
wr.sg_list = &sge;
wr.num_sge = 1;
return ib_post_recv(rdma->qp, &wr, NULL);
error:
p9_debug(P9_DEBUG_ERROR, "EIO\n");
return -EIO;
}
static int
post_recv(struct p9_client *client, struct p9_rdma_context *c)
{
struct p9_trans_rdma *rdma = client->trans;
struct ib_recv_wr wr, *bad_wr;
struct ib_sge sge;
c->busa = ib_dma_map_single(rdma->cm_id->device,
c->rc->sdata, client->msize,
DMA_FROM_DEVICE);
if (ib_dma_mapping_error(rdma->cm_id->device, c->busa))
goto error;
sge.addr = c->busa;
sge.length = client->msize;
sge.lkey = rdma->lkey;
wr.next = NULL;
c->wc_op = IB_WC_RECV;
wr.wr_id = (unsigned long) c;
wr.sg_list = &sge;
wr.num_sge = 1;
return ib_post_recv(rdma->qp, &wr, &bad_wr);
error:
p9_debug(P9_DEBUG_ERROR, "EIO\n");
return -EIO;
}
static int iser_alloc_login_buf(struct iser_conn *iser_conn)
{
struct iser_device *device = iser_conn->ib_conn.device;
int req_err, resp_err;
BUG_ON(device == NULL);
iser_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
ISER_RX_LOGIN_SIZE, GFP_KERNEL);
if (!iser_conn->login_buf)
goto out_err;
iser_conn->login_req_buf = iser_conn->login_buf;
iser_conn->login_resp_buf = iser_conn->login_buf +
ISCSI_DEF_MAX_RECV_SEG_LEN;
iser_conn->login_req_dma = ib_dma_map_single(device->ib_device,
iser_conn->login_req_buf,
ISCSI_DEF_MAX_RECV_SEG_LEN,
DMA_TO_DEVICE);
iser_conn->login_resp_dma = ib_dma_map_single(device->ib_device,
iser_conn->login_resp_buf,
ISER_RX_LOGIN_SIZE,
DMA_FROM_DEVICE);
req_err = ib_dma_mapping_error(device->ib_device,
iser_conn->login_req_dma);
resp_err = ib_dma_mapping_error(device->ib_device,
iser_conn->login_resp_dma);
if (req_err || resp_err) {
if (req_err)
iser_conn->login_req_dma = 0;
if (resp_err)
iser_conn->login_resp_dma = 0;
goto free_login_buf;
}
return 0;
free_login_buf:
iser_free_login_buf(iser_conn);
out_err:
iser_err("unable to alloc or map login buf\n");
return -ENOMEM;
}
/* Send a backwards direction RPC call.
*
* Caller holds the connection's mutex and has already marshaled
* the RPC/RDMA request.
*
* This is similar to svc_rdma_reply, but takes an rpc_rqst
* instead, does not support chunks, and avoids blocking memory
* allocation.
*
* XXX: There is still an opportunity to block in svc_rdma_send()
* if there are no SQ entries to post the Send. This may occur if
* the adapter has a small maximum SQ depth.
*/
static int svc_rdma_bc_sendto(struct svcxprt_rdma *rdma,
struct rpc_rqst *rqst)
{
struct xdr_buf *sndbuf = &rqst->rq_snd_buf;
struct svc_rdma_op_ctxt *ctxt;
struct svc_rdma_req_map *vec;
struct ib_send_wr send_wr;
int ret;
vec = svc_rdma_get_req_map(rdma);
ret = svc_rdma_map_xdr(rdma, sndbuf, vec, false);
if (ret)
goto out_err;
ret = svc_rdma_repost_recv(rdma, GFP_NOIO);
if (ret)
goto out_err;
ctxt = svc_rdma_get_context(rdma);
ctxt->pages[0] = virt_to_page(rqst->rq_buffer);
ctxt->count = 1;
ctxt->direction = DMA_TO_DEVICE;
ctxt->sge[0].lkey = rdma->sc_pd->local_dma_lkey;
ctxt->sge[0].length = sndbuf->len;
ctxt->sge[0].addr =
ib_dma_map_page(rdma->sc_cm_id->device, ctxt->pages[0], 0,
sndbuf->len, DMA_TO_DEVICE);
if (ib_dma_mapping_error(rdma->sc_cm_id->device, ctxt->sge[0].addr)) {
ret = -EIO;
goto out_unmap;
}
svc_rdma_count_mappings(rdma, ctxt);
memset(&send_wr, 0, sizeof(send_wr));
ctxt->cqe.done = svc_rdma_wc_send;
send_wr.wr_cqe = &ctxt->cqe;
send_wr.sg_list = ctxt->sge;
send_wr.num_sge = 1;
send_wr.opcode = IB_WR_SEND;
send_wr.send_flags = IB_SEND_SIGNALED;
ret = svc_rdma_send(rdma, &send_wr);
if (ret) {
ret = -EIO;
goto out_unmap;
}
out_err:
svc_rdma_put_req_map(rdma, vec);
dprintk("svcrdma: %s returns %d\n", __func__, ret);
return ret;
out_unmap:
svc_rdma_unmap_dma(ctxt);
svc_rdma_put_context(ctxt, 1);
goto out_err;
}
/*
* allocate a single fragment on a single ring entry and map it
* to HW address.
*/
static int vnic_alloc_frag(struct vnic_rx_ring *ring,
struct vnic_frag_data *frags_data, int i)
{
struct vnic_frag_info *frag_info = &ring->frag_info[i];
struct vnic_rx_alloc *page_alloc = &ring->page_alloc[i];
struct skb_frag_struct *skb_frags = &frags_data->frags[i];
struct skb_frag_struct skbf = *skb_frags;
struct page *page;
struct ib_device *ib_device = ring->port->dev->ca;
u64 dma;
int decision;
if (vnic_rx_linear)
return 0;
if (page_alloc->offset >= frag_info->last_offset) {
decision = 0;
/* Allocate new page */
page = alloc_pages(GFP_ATOMIC | __GFP_COMP, VNIC_ALLOC_ORDER);
if (!page) {
/*frags_data->dma_addr[i] = NULL;
ring->rx_info[wr_id].info = VNIC_FRAG_ALLOC_FAIL;
ring->need_refill = 1; */
return -ENOMEM;
}
skbf.page.p = page_alloc->page;
skbf.page_offset = page_alloc->offset;
} else {
decision = 1;
page = page_alloc->page;
get_page(page);
skbf.page.p = page;
skbf.page_offset = page_alloc->offset;
}
skbf.size = frag_info->frag_size;
dma = ib_dma_map_single(ib_device, page_address(skbf.page.p) +
skbf.page_offset, frag_info->frag_size,
PCI_DMA_FROMDEVICE);
if (unlikely(ib_dma_mapping_error(ib_device, dma))) {
vnic_dbg_data(ring->port->name,
"ib_dma_map_single len %d failed\n",
frag_info->frag_size);
put_page(page);
return -ENOMEM;
}
if (!decision) {
page_alloc->page = page;
page_alloc->offset = frag_info->frag_align;
} else
page_alloc->offset += frag_info->frag_stride;
*skb_frags = skbf;
frags_data->dma_addr[i] = dma;
return 0;
}
/*
* Map for DMA and insert a single page into the on-demand paging page tables.
*
* @umem: the umem to insert the page to.
* @page_index: index in the umem to add the page to.
* @page: the page struct to map and add.
* @access_mask: access permissions needed for this page.
* @current_seq: sequence number for synchronization with invalidations.
* the sequence number is taken from
* umem->odp_data->notifiers_seq.
*
* The function returns -EFAULT if the DMA mapping operation fails. It returns
* -EAGAIN if a concurrent invalidation prevents us from updating the page.
*
* The page is released via put_page even if the operation failed. For
* on-demand pinning, the page is released whenever it isn't stored in the
* umem.
*/
static int ib_umem_odp_map_dma_single_page(
struct ib_umem *umem,
int page_index,
struct page *page,
u64 access_mask,
unsigned long current_seq,
enum ib_odp_dma_map_flags flags)
{
struct ib_device *dev = umem->context->device;
dma_addr_t dma_addr;
int stored_page = 0;
int ret = 0;
mutex_lock(&umem->odp_data->umem_mutex);
/*
* Note: we avoid writing if seq is different from the initial seq, to
* handle case of a racing notifier. This check also allows us to bail
* early if we have a notifier running in parallel with us.
*/
if (ib_umem_mmu_notifier_retry(umem, current_seq)) {
ret = -EAGAIN;
goto out;
}
if (!(umem->odp_data->dma_list[page_index])) {
dma_addr = ib_dma_map_page(dev,
page,
0, PAGE_SIZE,
DMA_BIDIRECTIONAL);
if (ib_dma_mapping_error(dev, dma_addr)) {
ret = -EFAULT;
goto out;
}
umem->odp_data->dma_list[page_index] = dma_addr | access_mask;
umem->odp_data->page_list[page_index] = page;
if (flags & IB_ODP_DMA_MAP_FOR_PREFETCH)
atomic_inc(&dev->odp_statistics.num_prefetch_pages);
else
atomic_inc(&dev->odp_statistics.num_page_fault_pages);
stored_page = 1;
} else if (umem->odp_data->page_list[page_index] == page) {
umem->odp_data->dma_list[page_index] |= access_mask;
} else {
pr_err("error: got different pages in IB device and from get_user_pages. IB device page: %p, gup page: %p\n"
, umem->odp_data->page_list[page_index], page);
}
out:
mutex_unlock(&umem->odp_data->umem_mutex);
/* On Demand Paging - avoid pinning the page */
if (umem->context->invalidate_range || !stored_page)
put_page(page);
return ret;
}
static int
svc_rdma_post_recv(struct svcxprt_rdma *xprt)
{
struct ib_recv_wr recv_wr, *bad_recv_wr;
struct svc_rdma_op_ctxt *ctxt;
struct page *page;
dma_addr_t pa;
int sge_no;
int buflen;
int ret;
ctxt = svc_rdma_get_context(xprt);
buflen = 0;
ctxt->direction = DMA_FROM_DEVICE;
ctxt->cqe.done = svc_rdma_wc_receive;
for (sge_no = 0; buflen < xprt->sc_max_req_size; sge_no++) {
if (sge_no >= xprt->sc_max_sge) {
pr_err("svcrdma: Too many sges (%d)\n", sge_no);
goto err_put_ctxt;
}
page = alloc_page(GFP_KERNEL);
if (!page)
goto err_put_ctxt;
ctxt->pages[sge_no] = page;
pa = ib_dma_map_page(xprt->sc_cm_id->device,
page, 0, PAGE_SIZE,
DMA_FROM_DEVICE);
if (ib_dma_mapping_error(xprt->sc_cm_id->device, pa))
goto err_put_ctxt;
svc_rdma_count_mappings(xprt, ctxt);
ctxt->sge[sge_no].addr = pa;
ctxt->sge[sge_no].length = PAGE_SIZE;
ctxt->sge[sge_no].lkey = xprt->sc_pd->local_dma_lkey;
ctxt->count = sge_no + 1;
buflen += PAGE_SIZE;
}
recv_wr.next = NULL;
recv_wr.sg_list = &ctxt->sge[0];
recv_wr.num_sge = ctxt->count;
recv_wr.wr_cqe = &ctxt->cqe;
svc_xprt_get(&xprt->sc_xprt);
ret = ib_post_recv(xprt->sc_qp, &recv_wr, &bad_recv_wr);
if (ret) {
svc_rdma_unmap_dma(ctxt);
svc_rdma_put_context(ctxt, 1);
svc_xprt_put(&xprt->sc_xprt);
}
return ret;
err_put_ctxt:
svc_rdma_unmap_dma(ctxt);
svc_rdma_put_context(ctxt, 1);
return -ENOMEM;
}
static int iser_alloc_login_buf(struct iser_conn *iser_conn)
{
struct iser_device *device = iser_conn->ib_conn.device;
struct iser_login_desc *desc = &iser_conn->login_desc;
desc->req = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
if (!desc->req)
return -ENOMEM;
desc->req_dma = ib_dma_map_single(device->ib_device, desc->req,
ISCSI_DEF_MAX_RECV_SEG_LEN,
DMA_TO_DEVICE);
if (ib_dma_mapping_error(device->ib_device,
desc->req_dma))
goto free_req;
desc->rsp = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL);
if (!desc->rsp)
goto unmap_req;
desc->rsp_dma = ib_dma_map_single(device->ib_device, desc->rsp,
ISER_RX_LOGIN_SIZE,
DMA_FROM_DEVICE);
if (ib_dma_mapping_error(device->ib_device,
desc->rsp_dma))
goto free_rsp;
return 0;
free_rsp:
kfree(desc->rsp);
unmap_req:
ib_dma_unmap_single(device->ib_device, desc->req_dma,
ISCSI_DEF_MAX_RECV_SEG_LEN,
DMA_TO_DEVICE);
free_req:
kfree(desc->req);
return -ENOMEM;
}
u64 rdma_map_address(void* addr, int length)
{
u64 dma_addr;
LOG_KERN(LOG_INFO, ("Mapping addr\n"));
dma_addr = ib_dma_map_single(rdma_ib_device.dev, addr, length, DMA_BIDIRECTIONAL);
if (ib_dma_mapping_error(rdma_ib_device.dev, dma_addr) != 0) {
LOG_KERN(LOG_INFO, ("Error mapping myaddr"));
return 0; //error
}
return dma_addr;
}
int svc_rdma_post_recv(struct svcxprt_rdma *xprt)
{
struct ib_recv_wr recv_wr, *bad_recv_wr;
struct svc_rdma_op_ctxt *ctxt;
struct page *page;
dma_addr_t pa;
int sge_no;
int buflen;
int ret;
ctxt = svc_rdma_get_context(xprt);
buflen = 0;
ctxt->direction = DMA_FROM_DEVICE;
for (sge_no = 0; buflen < xprt->sc_max_req_size; sge_no++) {
BUG_ON(sge_no >= xprt->sc_max_sge);
page = svc_rdma_get_page();
ctxt->pages[sge_no] = page;
pa = ib_dma_map_page(xprt->sc_cm_id->device,
page, 0, PAGE_SIZE,
DMA_FROM_DEVICE);
if (ib_dma_mapping_error(xprt->sc_cm_id->device, pa))
goto err_put_ctxt;
atomic_inc(&xprt->sc_dma_used);
ctxt->sge[sge_no].addr = pa;
ctxt->sge[sge_no].length = PAGE_SIZE;
ctxt->sge[sge_no].lkey = xprt->sc_dma_lkey;
ctxt->count = sge_no + 1;
buflen += PAGE_SIZE;
}
recv_wr.next = NULL;
recv_wr.sg_list = &ctxt->sge[0];
recv_wr.num_sge = ctxt->count;
recv_wr.wr_id = (u64)(unsigned long)ctxt;
svc_xprt_get(&xprt->sc_xprt);
ret = ib_post_recv(xprt->sc_qp, &recv_wr, &bad_recv_wr);
if (ret) {
svc_rdma_unmap_dma(ctxt);
svc_rdma_put_context(ctxt, 1);
svc_xprt_put(&xprt->sc_xprt);
}
return ret;
err_put_ctxt:
svc_rdma_unmap_dma(ctxt);
svc_rdma_put_context(ctxt, 1);
return -ENOMEM;
}
/**
* iser_reg_single - fills registered buffer descriptor with
* registration information
*/
void iser_reg_single(struct iser_device *device,
struct iser_regd_buf *regd_buf,
enum dma_data_direction direction)
{
u64 dma_addr;
dma_addr = ib_dma_map_single(device->ib_device,
regd_buf->virt_addr,
regd_buf->data_size, direction);
BUG_ON(ib_dma_mapping_error(device->ib_device, dma_addr));
regd_buf->reg.lkey = device->mr->lkey;
regd_buf->reg.len = regd_buf->data_size;
regd_buf->reg.va = dma_addr;
regd_buf->reg.is_fmr = 0;
regd_buf->dma_addr = dma_addr;
regd_buf->direction = direction;
}
int iser_alloc_rx_descriptors(struct iser_conn *ib_conn)
{
int i, j;
u64 dma_addr;
struct iser_rx_desc *rx_desc;
struct ib_sge *rx_sg;
struct iser_device *device = ib_conn->device;
ib_conn->rx_descs = kmalloc(ISER_QP_MAX_RECV_DTOS *
sizeof(struct iser_rx_desc), GFP_KERNEL);
if (!ib_conn->rx_descs)
goto rx_desc_alloc_fail;
rx_desc = ib_conn->rx_descs;
for (i = 0; i < ISER_QP_MAX_RECV_DTOS; i++, rx_desc++) {
dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc,
ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
if (ib_dma_mapping_error(device->ib_device, dma_addr))
goto rx_desc_dma_map_failed;
rx_desc->dma_addr = dma_addr;
rx_sg = &rx_desc->rx_sg;
rx_sg->addr = rx_desc->dma_addr;
rx_sg->length = ISER_RX_PAYLOAD_SIZE;
rx_sg->lkey = device->mr->lkey;
}
ib_conn->rx_desc_head = 0;
return 0;
rx_desc_dma_map_failed:
rx_desc = ib_conn->rx_descs;
for (j = 0; j < i; j++, rx_desc++)
ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr,
ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
kfree(ib_conn->rx_descs);
ib_conn->rx_descs = NULL;
rx_desc_alloc_fail:
iser_err("failed allocating rx descriptors / data buffers\n");
return -ENOMEM;
}
int iser_initialize_task_headers(struct iscsi_task *task,
struct iser_tx_desc *tx_desc)
{
struct iser_conn *ib_conn = task->conn->dd_data;
struct iser_device *device = ib_conn->device;
struct iscsi_iser_task *iser_task = task->dd_data;
u64 dma_addr;
dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
ISER_HEADERS_LEN, DMA_TO_DEVICE);
if (ib_dma_mapping_error(device->ib_device, dma_addr))
return -ENOMEM;
tx_desc->dma_addr = dma_addr;
tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
tx_desc->tx_sg[0].lkey = device->mr->lkey;
iser_task->ib_conn = ib_conn;
return 0;
}
/**
* iser_initialize_task_headers() - Initialize task headers
* @task: iscsi task
* @tx_desc: iser tx descriptor
*
* Notes:
* This routine may race with iser teardown flow for scsi
* error handling TMFs. So for TMF we should acquire the
* state mutex to avoid dereferencing the IB device which
* may have already been terminated.
*/
int
iser_initialize_task_headers(struct iscsi_task *task,
struct iser_tx_desc *tx_desc)
{
struct iser_conn *iser_conn = task->conn->dd_data;
struct iser_device *device = iser_conn->ib_conn.device;
struct iscsi_iser_task *iser_task = task->dd_data;
u64 dma_addr;
const bool mgmt_task = !task->sc && !in_interrupt();
int ret = 0;
if (unlikely(mgmt_task))
mutex_lock(&iser_conn->state_mutex);
if (unlikely(iser_conn->state != ISER_CONN_UP)) {
ret = -ENODEV;
goto out;
}
dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
ISER_HEADERS_LEN, DMA_TO_DEVICE);
if (ib_dma_mapping_error(device->ib_device, dma_addr)) {
ret = -ENOMEM;
goto out;
}
tx_desc->wr_idx = 0;
tx_desc->mapped = true;
tx_desc->dma_addr = dma_addr;
tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
iser_task->iser_conn = iser_conn;
out:
if (unlikely(mgmt_task))
mutex_unlock(&iser_conn->state_mutex);
return ret;
}
static struct svc_rdma_recv_ctxt *
svc_rdma_recv_ctxt_alloc(struct svcxprt_rdma *rdma)
{
struct svc_rdma_recv_ctxt *ctxt;
dma_addr_t addr;
void *buffer;
ctxt = kmalloc(sizeof(*ctxt), GFP_KERNEL);
if (!ctxt)
goto fail0;
buffer = kmalloc(rdma->sc_max_req_size, GFP_KERNEL);
if (!buffer)
goto fail1;
addr = ib_dma_map_single(rdma->sc_pd->device, buffer,
rdma->sc_max_req_size, DMA_FROM_DEVICE);
if (ib_dma_mapping_error(rdma->sc_pd->device, addr))
goto fail2;
ctxt->rc_recv_wr.next = NULL;
ctxt->rc_recv_wr.wr_cqe = &ctxt->rc_cqe;
ctxt->rc_recv_wr.sg_list = &ctxt->rc_recv_sge;
ctxt->rc_recv_wr.num_sge = 1;
ctxt->rc_cqe.done = svc_rdma_wc_receive;
ctxt->rc_recv_sge.addr = addr;
ctxt->rc_recv_sge.length = rdma->sc_max_req_size;
ctxt->rc_recv_sge.lkey = rdma->sc_pd->local_dma_lkey;
ctxt->rc_recv_buf = buffer;
ctxt->rc_temp = false;
return ctxt;
fail2:
kfree(buffer);
fail1:
kfree(ctxt);
fail0:
return NULL;
}
static int rdma_setup(rdma_ctx_t ctx)
{
// create receive buffer
ctx->rdma_recv_buffer = kmalloc(RDMA_BUFFER_SIZE, GFP_KERNEL);
CHECK_MSG_RET(ctx->rdma_recv_buffer != 0, "Error kmalloc", -1);
// create memory region
ctx->mr = ib_get_dma_mr(ctx->pd, IB_ACCESS_REMOTE_READ |
IB_ACCESS_REMOTE_WRITE |
IB_ACCESS_LOCAL_WRITE);
CHECK_MSG_RET(ctx->mr != 0, "Error creating MR", -1);
ctx->rkey = ctx->mr->rkey;
// get dma_addr
ctx->dma_addr = ib_dma_map_single(rdma_ib_device.dev, ctx->rdma_recv_buffer,
RDMA_BUFFER_SIZE, DMA_BIDIRECTIONAL);
CHECK_MSG_RET(ib_dma_mapping_error(rdma_ib_device.dev, ctx->dma_addr) == 0,
"Error ib_dma_map_single", -1);
// modify QP until RTS
modify_qp(ctx);
return 0;
}
static int rdma_request(struct p9_client *client, struct p9_req_t *req)
{
struct p9_trans_rdma *rdma = client->trans;
struct ib_send_wr wr, *bad_wr;
struct ib_sge sge;
int err = 0;
unsigned long flags;
struct p9_rdma_context *c = NULL;
struct p9_rdma_context *rpl_context = NULL;
/* Allocate an fcall for the reply */
rpl_context = kmalloc(sizeof *rpl_context, GFP_KERNEL);
if (!rpl_context)
goto err_close;
/*
* If the request has a buffer, steal it, otherwise
* allocate a new one. Typically, requests should already
* have receive buffers allocated and just swap them around
*/
if (!req->rc) {
req->rc = kmalloc(sizeof(struct p9_fcall)+client->msize,
GFP_KERNEL);
if (req->rc) {
req->rc->sdata = (char *) req->rc +
sizeof(struct p9_fcall);
req->rc->capacity = client->msize;
}
}
rpl_context->rc = req->rc;
if (!rpl_context->rc) {
kfree(rpl_context);
goto err_close;
}
/*
* Post a receive buffer for this request. We need to ensure
* there is a reply buffer available for every outstanding
* request. A flushed request can result in no reply for an
* outstanding request, so we must keep a count to avoid
* overflowing the RQ.
*/
if (atomic_inc_return(&rdma->rq_count) <= rdma->rq_depth) {
err = post_recv(client, rpl_context);
if (err) {
kfree(rpl_context->rc);
kfree(rpl_context);
goto err_close;
}
} else
atomic_dec(&rdma->rq_count);
/* remove posted receive buffer from request structure */
req->rc = NULL;
/* Post the request */
c = kmalloc(sizeof *c, GFP_KERNEL);
if (!c)
goto err_close;
c->req = req;
c->busa = ib_dma_map_single(rdma->cm_id->device,
c->req->tc->sdata, c->req->tc->size,
DMA_TO_DEVICE);
if (ib_dma_mapping_error(rdma->cm_id->device, c->busa))
goto error;
sge.addr = c->busa;
sge.length = c->req->tc->size;
sge.lkey = rdma->lkey;
wr.next = NULL;
c->wc_op = IB_WC_SEND;
wr.wr_id = (unsigned long) c;
wr.opcode = IB_WR_SEND;
wr.send_flags = IB_SEND_SIGNALED;
wr.sg_list = &sge;
wr.num_sge = 1;
if (down_interruptible(&rdma->sq_sem))
goto error;
return ib_post_send(rdma->qp, &wr, &bad_wr);
error:
P9_DPRINTK(P9_DEBUG_ERROR, "EIO\n");
return -EIO;
err_close:
spin_lock_irqsave(&rdma->req_lock, flags);
if (rdma->state < P9_RDMA_CLOSING) {
rdma->state = P9_RDMA_CLOSING;
spin_unlock_irqrestore(&rdma->req_lock, flags);
rdma_disconnect(rdma->cm_id);
} else
spin_unlock_irqrestore(&rdma->req_lock, flags);
return err;
}
static int send_reply(struct svcxprt_rdma *rdma,
struct svc_rqst *rqstp,
struct page *page,
struct rpcrdma_msg *rdma_resp,
struct svc_rdma_op_ctxt *ctxt,
struct svc_rdma_req_map *vec,
int byte_count)
{
struct ib_send_wr send_wr;
struct ib_send_wr inv_wr;
int sge_no;
int sge_bytes;
int page_no;
int ret;
/* Post a recv buffer to handle another request. */
ret = svc_rdma_post_recv(rdma);
if (ret) {
printk(KERN_INFO
"svcrdma: could not post a receive buffer, err=%d."
"Closing transport %p.\n", ret, rdma);
set_bit(XPT_CLOSE, &rdma->sc_xprt.xpt_flags);
svc_rdma_put_frmr(rdma, vec->frmr);
svc_rdma_put_context(ctxt, 0);
return -ENOTCONN;
}
/* Prepare the context */
ctxt->pages[0] = page;
ctxt->count = 1;
ctxt->frmr = vec->frmr;
if (vec->frmr)
set_bit(RDMACTXT_F_FAST_UNREG, &ctxt->flags);
else
clear_bit(RDMACTXT_F_FAST_UNREG, &ctxt->flags);
/* Prepare the SGE for the RPCRDMA Header */
ctxt->sge[0].lkey = rdma->sc_dma_lkey;
ctxt->sge[0].length = svc_rdma_xdr_get_reply_hdr_len(rdma_resp);
ctxt->sge[0].addr =
ib_dma_map_single(rdma->sc_cm_id->device, page_address(page),
ctxt->sge[0].length, DMA_TO_DEVICE);
if (ib_dma_mapping_error(rdma->sc_cm_id->device, ctxt->sge[0].addr))
goto err;
atomic_inc(&rdma->sc_dma_used);
ctxt->direction = DMA_TO_DEVICE;
/* Determine how many of our SGE are to be transmitted */
for (sge_no = 1; byte_count && sge_no < vec->count; sge_no++) {
sge_bytes = min_t(size_t, vec->sge[sge_no].iov_len, byte_count);
byte_count -= sge_bytes;
if (!vec->frmr) {
ctxt->sge[sge_no].addr =
ib_dma_map_single(rdma->sc_cm_id->device,
vec->sge[sge_no].iov_base,
sge_bytes, DMA_TO_DEVICE);
if (ib_dma_mapping_error(rdma->sc_cm_id->device,
ctxt->sge[sge_no].addr))
goto err;
atomic_inc(&rdma->sc_dma_used);
ctxt->sge[sge_no].lkey = rdma->sc_dma_lkey;
} else {
ctxt->sge[sge_no].addr = (unsigned long)
vec->sge[sge_no].iov_base;
ctxt->sge[sge_no].lkey = vec->frmr->mr->lkey;
}
ctxt->sge[sge_no].length = sge_bytes;
}
BUG_ON(byte_count != 0);
/* Save all respages in the ctxt and remove them from the
* respages array. They are our pages until the I/O
* completes.
*/
for (page_no = 0; page_no < rqstp->rq_resused; page_no++) {
ctxt->pages[page_no+1] = rqstp->rq_respages[page_no];
ctxt->count++;
rqstp->rq_respages[page_no] = NULL;
/*
* If there are more pages than SGE, terminate SGE
* list so that svc_rdma_unmap_dma doesn't attempt to
* unmap garbage.
*/
if (page_no+1 >= sge_no)
ctxt->sge[page_no+1].length = 0;
}
BUG_ON(sge_no > rdma->sc_max_sge);
memset(&send_wr, 0, sizeof send_wr);
ctxt->wr_op = IB_WR_SEND;
send_wr.wr_id = (unsigned long)ctxt;
send_wr.sg_list = ctxt->sge;
send_wr.num_sge = sge_no;
send_wr.opcode = IB_WR_SEND;
send_wr.send_flags = IB_SEND_SIGNALED;
if (vec->frmr) {
/* Prepare INVALIDATE WR */
memset(&inv_wr, 0, sizeof inv_wr);
inv_wr.opcode = IB_WR_LOCAL_INV;
inv_wr.send_flags = IB_SEND_SIGNALED;
inv_wr.ex.invalidate_rkey =
vec->frmr->mr->lkey;
send_wr.next = &inv_wr;
}
ret = svc_rdma_send(rdma, &send_wr);
if (ret)
goto err;
return 0;
err:
svc_rdma_unmap_dma(ctxt);
svc_rdma_put_frmr(rdma, vec->frmr);
svc_rdma_put_context(ctxt, 1);
return -EIO;
}
static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
u32 rmr, u64 to,
u32 xdr_off, int write_len,
struct svc_rdma_req_map *vec)
{
struct ib_send_wr write_wr;
struct ib_sge *sge;
int xdr_sge_no;
int sge_no;
int sge_bytes;
int sge_off;
int bc;
struct svc_rdma_op_ctxt *ctxt;
BUG_ON(vec->count > RPCSVC_MAXPAGES);
dprintk("svcrdma: RDMA_WRITE rmr=%x, to=%llx, xdr_off=%d, "
"write_len=%d, vec->sge=%p, vec->count=%lu\n",
rmr, (unsigned long long)to, xdr_off,
write_len, vec->sge, vec->count);
ctxt = svc_rdma_get_context(xprt);
ctxt->direction = DMA_TO_DEVICE;
sge = ctxt->sge;
/* Find the SGE associated with xdr_off */
for (bc = xdr_off, xdr_sge_no = 1; bc && xdr_sge_no < vec->count;
xdr_sge_no++) {
if (vec->sge[xdr_sge_no].iov_len > bc)
break;
bc -= vec->sge[xdr_sge_no].iov_len;
}
sge_off = bc;
bc = write_len;
sge_no = 0;
/* Copy the remaining SGE */
while (bc != 0) {
sge_bytes = min_t(size_t,
bc, vec->sge[xdr_sge_no].iov_len-sge_off);
sge[sge_no].length = sge_bytes;
if (!vec->frmr) {
sge[sge_no].addr =
ib_dma_map_single(xprt->sc_cm_id->device,
(void *)
vec->sge[xdr_sge_no].iov_base + sge_off,
sge_bytes, DMA_TO_DEVICE);
if (ib_dma_mapping_error(xprt->sc_cm_id->device,
sge[sge_no].addr))
goto err;
atomic_inc(&xprt->sc_dma_used);
sge[sge_no].lkey = xprt->sc_dma_lkey;
} else {
sge[sge_no].addr = (unsigned long)
vec->sge[xdr_sge_no].iov_base + sge_off;
sge[sge_no].lkey = vec->frmr->mr->lkey;
}
ctxt->count++;
ctxt->frmr = vec->frmr;
sge_off = 0;
sge_no++;
xdr_sge_no++;
BUG_ON(xdr_sge_no > vec->count);
bc -= sge_bytes;
}
/* Prepare WRITE WR */
memset(&write_wr, 0, sizeof write_wr);
ctxt->wr_op = IB_WR_RDMA_WRITE;
write_wr.wr_id = (unsigned long)ctxt;
write_wr.sg_list = &sge[0];
write_wr.num_sge = sge_no;
write_wr.opcode = IB_WR_RDMA_WRITE;
write_wr.send_flags = IB_SEND_SIGNALED;
write_wr.wr.rdma.rkey = rmr;
write_wr.wr.rdma.remote_addr = to;
/* Post It */
atomic_inc(&rdma_stat_write);
if (svc_rdma_send(xprt, &write_wr))
goto err;
return 0;
err:
svc_rdma_put_context(ctxt, 0);
/* Fatal error, close transport */
return -EIO;
}
static int fast_reg_xdr(struct svcxprt_rdma *xprt,
struct xdr_buf *xdr,
struct svc_rdma_req_map *vec)
{
int sge_no;
u32 sge_bytes;
u32 page_bytes;
u32 page_off;
int page_no = 0;
u8 *frva;
struct svc_rdma_fastreg_mr *frmr;
frmr = svc_rdma_get_frmr(xprt);
if (IS_ERR(frmr))
return -ENOMEM;
vec->frmr = frmr;
/* Skip the RPCRDMA header */
sge_no = 1;
/* Map the head. */
frva = (void *)((unsigned long)(xdr->head[0].iov_base) & PAGE_MASK);
vec->sge[sge_no].iov_base = xdr->head[0].iov_base;
vec->sge[sge_no].iov_len = xdr->head[0].iov_len;
vec->count = 2;
sge_no++;
/* Build the FRMR */
frmr->kva = frva;
frmr->direction = DMA_TO_DEVICE;
frmr->access_flags = 0;
frmr->map_len = PAGE_SIZE;
frmr->page_list_len = 1;
frmr->page_list->page_list[page_no] =
ib_dma_map_single(xprt->sc_cm_id->device,
(void *)xdr->head[0].iov_base,
PAGE_SIZE, DMA_TO_DEVICE);
if (ib_dma_mapping_error(xprt->sc_cm_id->device,
frmr->page_list->page_list[page_no]))
goto fatal_err;
atomic_inc(&xprt->sc_dma_used);
page_off = xdr->page_base;
page_bytes = xdr->page_len + page_off;
if (!page_bytes)
goto encode_tail;
/* Map the pages */
vec->sge[sge_no].iov_base = frva + frmr->map_len + page_off;
vec->sge[sge_no].iov_len = page_bytes;
sge_no++;
while (page_bytes) {
struct page *page;
page = xdr->pages[page_no++];
sge_bytes = min_t(u32, page_bytes, (PAGE_SIZE - page_off));
page_bytes -= sge_bytes;
frmr->page_list->page_list[page_no] =
ib_dma_map_single(xprt->sc_cm_id->device,
page_address(page),
PAGE_SIZE, DMA_TO_DEVICE);
if (ib_dma_mapping_error(xprt->sc_cm_id->device,
frmr->page_list->page_list[page_no]))
goto fatal_err;
atomic_inc(&xprt->sc_dma_used);
page_off = 0; /* reset for next time through loop */
frmr->map_len += PAGE_SIZE;
frmr->page_list_len++;
}
vec->count++;
encode_tail:
/* Map tail */
if (0 == xdr->tail[0].iov_len)
goto done;
vec->count++;
vec->sge[sge_no].iov_len = xdr->tail[0].iov_len;
if (((unsigned long)xdr->tail[0].iov_base & PAGE_MASK) ==
((unsigned long)xdr->head[0].iov_base & PAGE_MASK)) {
/*
* If head and tail use the same page, we don't need
* to map it again.
*/
vec->sge[sge_no].iov_base = xdr->tail[0].iov_base;
} else {
void *va;
/* Map another page for the tail */
page_off = (unsigned long)xdr->tail[0].iov_base & ~PAGE_MASK;
va = (void *)((unsigned long)xdr->tail[0].iov_base & PAGE_MASK);
vec->sge[sge_no].iov_base = frva + frmr->map_len + page_off;
frmr->page_list->page_list[page_no] =
ib_dma_map_single(xprt->sc_cm_id->device, va, PAGE_SIZE,
DMA_TO_DEVICE);
if (ib_dma_mapping_error(xprt->sc_cm_id->device,
frmr->page_list->page_list[page_no]))
goto fatal_err;
atomic_inc(&xprt->sc_dma_used);
frmr->map_len += PAGE_SIZE;
frmr->page_list_len++;
}
done:
if (svc_rdma_fastreg(xprt, frmr))
goto fatal_err;
return 0;
fatal_err:
printk("svcrdma: Error fast registering memory for xprt %p\n", xprt);
vec->frmr = NULL;
svc_rdma_put_frmr(xprt, frmr);
return -EIO;
}
/* Map a read-chunk-list to an XDR and fast register the page-list.
*
* Assumptions:
* - chunk[0] position points to pages[0] at an offset of 0
* - pages[] will be made physically contiguous by creating a one-off memory
* region using the fastreg verb.
* - byte_count is # of bytes in read-chunk-list
* - ch_count is # of chunks in read-chunk-list
*
* Output:
* - sge array pointing into pages[] array.
* - chunk_sge array specifying sge index and count for each
* chunk in the read list
*/
static int fast_reg_read_chunks(struct svcxprt_rdma *xprt,
struct svc_rqst *rqstp,
struct svc_rdma_op_ctxt *head,
struct rpcrdma_msg *rmsgp,
struct svc_rdma_req_map *rpl_map,
struct svc_rdma_req_map *chl_map,
int ch_count,
int byte_count)
{
int page_no;
int ch_no;
u32 offset;
struct rpcrdma_read_chunk *ch;
struct svc_rdma_fastreg_mr *frmr;
int ret = 0;
frmr = svc_rdma_get_frmr(xprt);
if (IS_ERR(frmr))
return -ENOMEM;
head->frmr = frmr;
head->arg.head[0] = rqstp->rq_arg.head[0];
head->arg.tail[0] = rqstp->rq_arg.tail[0];
head->arg.pages = &head->pages[head->count];
head->hdr_count = head->count; /* save count of hdr pages */
head->arg.page_base = 0;
head->arg.page_len = byte_count;
head->arg.len = rqstp->rq_arg.len + byte_count;
head->arg.buflen = rqstp->rq_arg.buflen + byte_count;
/* Fast register the page list */
frmr->kva = page_address(rqstp->rq_arg.pages[0]);
frmr->direction = DMA_FROM_DEVICE;
frmr->access_flags = (IB_ACCESS_LOCAL_WRITE|IB_ACCESS_REMOTE_WRITE);
frmr->map_len = byte_count;
frmr->page_list_len = PAGE_ALIGN(byte_count) >> PAGE_SHIFT;
for (page_no = 0; page_no < frmr->page_list_len; page_no++) {
frmr->page_list->page_list[page_no] =
ib_dma_map_page(xprt->sc_cm_id->device,
rqstp->rq_arg.pages[page_no], 0,
PAGE_SIZE, DMA_FROM_DEVICE);
if (ib_dma_mapping_error(xprt->sc_cm_id->device,
frmr->page_list->page_list[page_no]))
goto fatal_err;
atomic_inc(&xprt->sc_dma_used);
head->arg.pages[page_no] = rqstp->rq_arg.pages[page_no];
}
head->count += page_no;
/* rq_respages points one past arg pages */
rqstp->rq_respages = &rqstp->rq_arg.pages[page_no];
/* Create the reply and chunk maps */
offset = 0;
ch = (struct rpcrdma_read_chunk *)&rmsgp->rm_body.rm_chunks[0];
for (ch_no = 0; ch_no < ch_count; ch_no++) {
rpl_map->sge[ch_no].iov_base = frmr->kva + offset;
rpl_map->sge[ch_no].iov_len = ch->rc_target.rs_length;
chl_map->ch[ch_no].count = 1;
chl_map->ch[ch_no].start = ch_no;
offset += ch->rc_target.rs_length;
ch++;
}
ret = svc_rdma_fastreg(xprt, frmr);
if (ret)
goto fatal_err;
return ch_no;
fatal_err:
printk("svcrdma: error fast registering xdr for xprt %p", xprt);
svc_rdma_put_frmr(xprt, frmr);
return -EIO;
}
static int rdma_request(struct p9_client *client, struct p9_req_t *req)
{
struct p9_trans_rdma *rdma = client->trans;
struct ib_send_wr wr, *bad_wr;
struct ib_sge sge;
int err = 0;
unsigned long flags;
struct p9_rdma_context *c = NULL;
struct p9_rdma_context *rpl_context = NULL;
/* When an error occurs between posting the recv and the send,
* there will be a receive context posted without a pending request.
* Since there is no way to "un-post" it, we remember it and skip
* post_recv() for the next request.
* So here,
* see if we are this `next request' and need to absorb an excess rc.
* If yes, then drop and free our own, and do not recv_post().
**/
if (unlikely(atomic_read(&rdma->excess_rc) > 0)) {
if ((atomic_sub_return(1, &rdma->excess_rc) >= 0)) {
/* Got one ! */
kfree(req->rc);
req->rc = NULL;
goto dont_need_post_recv;
} else {
/* We raced and lost. */
atomic_inc(&rdma->excess_rc);
}
}
/* Allocate an fcall for the reply */
rpl_context = kmalloc(sizeof *rpl_context, GFP_NOFS);
if (!rpl_context) {
err = -ENOMEM;
goto recv_error;
}
rpl_context->rc = req->rc;
/*
* Post a receive buffer for this request. We need to ensure
* there is a reply buffer available for every outstanding
* request. A flushed request can result in no reply for an
* outstanding request, so we must keep a count to avoid
* overflowing the RQ.
*/
if (down_interruptible(&rdma->rq_sem)) {
err = -EINTR;
goto recv_error;
}
err = post_recv(client, rpl_context);
if (err) {
p9_debug(P9_DEBUG_FCALL, "POST RECV failed\n");
goto recv_error;
}
/* remove posted receive buffer from request structure */
req->rc = NULL;
dont_need_post_recv:
/* Post the request */
c = kmalloc(sizeof *c, GFP_NOFS);
if (!c) {
err = -ENOMEM;
goto send_error;
}
c->req = req;
c->busa = ib_dma_map_single(rdma->cm_id->device,
c->req->tc->sdata, c->req->tc->size,
DMA_TO_DEVICE);
if (ib_dma_mapping_error(rdma->cm_id->device, c->busa)) {
err = -EIO;
goto send_error;
}
sge.addr = c->busa;
sge.length = c->req->tc->size;
sge.lkey = rdma->lkey;
wr.next = NULL;
c->wc_op = IB_WC_SEND;
wr.wr_id = (unsigned long) c;
wr.opcode = IB_WR_SEND;
wr.send_flags = IB_SEND_SIGNALED;
wr.sg_list = &sge;
wr.num_sge = 1;
if (down_interruptible(&rdma->sq_sem)) {
err = -EINTR;
goto send_error;
}
/* Mark request as `sent' *before* we actually send it,
* because doing if after could erase the REQ_STATUS_RCVD
* status in case of a very fast reply.
*/
req->status = REQ_STATUS_SENT;
err = ib_post_send(rdma->qp, &wr, &bad_wr);
if (err)
goto send_error;
/* Success */
return 0;
/* Handle errors that happened during or while preparing the send: */
send_error:
req->status = REQ_STATUS_ERROR;
kfree(c);
p9_debug(P9_DEBUG_ERROR, "Error %d in rdma_request()\n", err);
/* Ach.
* We did recv_post(), but not send. We have one recv_post in excess.
*/
atomic_inc(&rdma->excess_rc);
return err;
/* Handle errors that happened during or while preparing post_recv(): */
recv_error:
kfree(rpl_context);
spin_lock_irqsave(&rdma->req_lock, flags);
if (rdma->state < P9_RDMA_CLOSING) {
rdma->state = P9_RDMA_CLOSING;
spin_unlock_irqrestore(&rdma->req_lock, flags);
rdma_disconnect(rdma->cm_id);
} else
spin_unlock_irqrestore(&rdma->req_lock, flags);
return err;
}
static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
{
struct iser_device *device;
struct ib_qp_init_attr init_attr;
int req_err, resp_err, ret = -ENOMEM;
struct ib_fmr_pool_param params;
BUG_ON(ib_conn->device == NULL);
device = ib_conn->device;
ib_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
ISER_RX_LOGIN_SIZE, GFP_KERNEL);
if (!ib_conn->login_buf)
goto out_err;
ib_conn->login_req_buf = ib_conn->login_buf;
ib_conn->login_resp_buf = ib_conn->login_buf + ISCSI_DEF_MAX_RECV_SEG_LEN;
ib_conn->login_req_dma = ib_dma_map_single(ib_conn->device->ib_device,
(void *)ib_conn->login_req_buf,
ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
ib_conn->login_resp_dma = ib_dma_map_single(ib_conn->device->ib_device,
(void *)ib_conn->login_resp_buf,
ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
req_err = ib_dma_mapping_error(device->ib_device, ib_conn->login_req_dma);
resp_err = ib_dma_mapping_error(device->ib_device, ib_conn->login_resp_dma);
if (req_err || resp_err) {
if (req_err)
ib_conn->login_req_dma = 0;
if (resp_err)
ib_conn->login_resp_dma = 0;
goto out_err;
}
ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) +
(sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)),
GFP_KERNEL);
if (!ib_conn->page_vec)
goto out_err;
ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1);
params.page_shift = SHIFT_4K;
params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1;
params.pool_size = ISCSI_DEF_XMIT_CMDS_MAX * 2;
params.dirty_watermark = ISCSI_DEF_XMIT_CMDS_MAX;
params.cache = 0;
params.flush_function = NULL;
params.access = (IB_ACCESS_LOCAL_WRITE |
IB_ACCESS_REMOTE_WRITE |
IB_ACCESS_REMOTE_READ);
ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, ¶ms);
if (IS_ERR(ib_conn->fmr_pool)) {
ret = PTR_ERR(ib_conn->fmr_pool);
ib_conn->fmr_pool = NULL;
goto out_err;
}
memset(&init_attr, 0, sizeof init_attr);
init_attr.event_handler = iser_qp_event_callback;
init_attr.qp_context = (void *)ib_conn;
init_attr.send_cq = device->tx_cq;
init_attr.recv_cq = device->rx_cq;
init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS;
init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS;
init_attr.cap.max_send_sge = 2;
init_attr.cap.max_recv_sge = 1;
init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
init_attr.qp_type = IB_QPT_RC;
ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);
if (ret)
goto out_err;
ib_conn->qp = ib_conn->cma_id->qp;
iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n",
ib_conn, ib_conn->cma_id,
ib_conn->fmr_pool, ib_conn->cma_id->qp);
return ret;
out_err:
iser_err("unable to alloc mem or create resource, err %d\n", ret);
return ret;
}
/* Issue an RDMA_READ using the local lkey to map the data sink */
static int rdma_read_chunk_lcl(struct svcxprt_rdma *xprt,
struct svc_rqst *rqstp,
struct svc_rdma_op_ctxt *head,
int *page_no,
u32 *page_offset,
u32 rs_handle,
u32 rs_length,
u64 rs_offset,
int last)
{
struct ib_send_wr read_wr;
int pages_needed = PAGE_ALIGN(*page_offset + rs_length) >> PAGE_SHIFT;
struct svc_rdma_op_ctxt *ctxt = svc_rdma_get_context(xprt);
int ret, read, pno;
u32 pg_off = *page_offset;
u32 pg_no = *page_no;
ctxt->direction = DMA_FROM_DEVICE;
ctxt->read_hdr = head;
pages_needed =
min_t(int, pages_needed, rdma_read_max_sge(xprt, pages_needed));
read = min_t(int, pages_needed << PAGE_SHIFT, rs_length);
for (pno = 0; pno < pages_needed; pno++) {
int len = min_t(int, rs_length, PAGE_SIZE - pg_off);
head->arg.pages[pg_no] = rqstp->rq_arg.pages[pg_no];
head->arg.page_len += len;
head->arg.len += len;
if (!pg_off)
head->count++;
rqstp->rq_respages = &rqstp->rq_arg.pages[pg_no+1];
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
rqstp->rq_next_page = rqstp->rq_respages + 1;
#endif
ctxt->sge[pno].addr =
ib_dma_map_page(xprt->sc_cm_id->device,
head->arg.pages[pg_no], pg_off,
PAGE_SIZE - pg_off,
DMA_FROM_DEVICE);
ret = ib_dma_mapping_error(xprt->sc_cm_id->device,
ctxt->sge[pno].addr);
if (ret)
goto err;
atomic_inc(&xprt->sc_dma_used);
/* The lkey here is either a local dma lkey or a dma_mr lkey */
ctxt->sge[pno].lkey = xprt->sc_dma_lkey;
ctxt->sge[pno].length = len;
ctxt->count++;
/* adjust offset and wrap to next page if needed */
pg_off += len;
if (pg_off == PAGE_SIZE) {
pg_off = 0;
pg_no++;
}
rs_length -= len;
}
if (last && rs_length == 0)
set_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
else
clear_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
memset(&read_wr, 0, sizeof(read_wr));
read_wr.wr_id = (unsigned long)ctxt;
read_wr.opcode = IB_WR_RDMA_READ;
ctxt->wr_op = read_wr.opcode;
read_wr.send_flags = IB_SEND_SIGNALED;
read_wr.wr.rdma.rkey = rs_handle;
read_wr.wr.rdma.remote_addr = rs_offset;
read_wr.sg_list = ctxt->sge;
read_wr.num_sge = pages_needed;
ret = svc_rdma_send(xprt, &read_wr);
if (ret) {
pr_err("svcrdma: Error %d posting RDMA_READ\n", ret);
set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
goto err;
}
/* return current location in page array */
*page_no = pg_no;
*page_offset = pg_off;
ret = read;
atomic_inc(&rdma_stat_read);
return ret;
err:
svc_rdma_unmap_dma(ctxt);
svc_rdma_put_context(ctxt, 0);
return ret;
}
void
sdp_post_send(struct sdp_sock *ssk, struct mbuf *mb)
{
struct sdp_buf *tx_req;
struct sdp_bsdh *h;
unsigned long mseq;
struct ib_device *dev;
struct ib_send_wr *bad_wr;
struct ib_sge ibsge[SDP_MAX_SEND_SGES];
struct ib_sge *sge;
struct ib_send_wr tx_wr = { NULL };
int i, rc;
u64 addr;
SDPSTATS_COUNTER_MID_INC(post_send, h->mid);
SDPSTATS_HIST(send_size, mb->len);
if (!ssk->qp_active) {
m_freem(mb);
return;
}
mseq = ring_head(ssk->tx_ring);
h = mtod(mb, struct sdp_bsdh *);
ssk->tx_packets++;
ssk->tx_bytes += mb->m_pkthdr.len;
#ifdef SDP_ZCOPY
if (unlikely(h->mid == SDP_MID_SRCAVAIL)) {
struct tx_srcavail_state *tx_sa = TX_SRCAVAIL_STATE(mb);
if (ssk->tx_sa != tx_sa) {
sdp_dbg_data(ssk->socket, "SrcAvail cancelled "
"before being sent!\n");
WARN_ON(1);
m_freem(mb);
return;
}
TX_SRCAVAIL_STATE(mb)->mseq = mseq;
}
#endif
if (unlikely(mb->m_flags & M_URG))
h->flags = SDP_OOB_PRES | SDP_OOB_PEND;
else
h->flags = 0;
mb->m_flags |= M_RDONLY; /* Don't allow compression once sent. */
h->bufs = htons(rx_ring_posted(ssk));
h->len = htonl(mb->m_pkthdr.len);
h->mseq = htonl(mseq);
h->mseq_ack = htonl(mseq_ack(ssk));
sdp_prf1(ssk->socket, mb, "TX: %s bufs: %d mseq:%ld ack:%d",
mid2str(h->mid), rx_ring_posted(ssk), mseq,
ntohl(h->mseq_ack));
SDP_DUMP_PACKET(ssk->socket, "TX", mb, h);
tx_req = &ssk->tx_ring.buffer[mseq & (SDP_TX_SIZE - 1)];
tx_req->mb = mb;
dev = ssk->ib_device;
sge = &ibsge[0];
for (i = 0; mb != NULL; i++, mb = mb->m_next, sge++) {
addr = ib_dma_map_single(dev, mb->m_data, mb->m_len,
DMA_TO_DEVICE);
/* TODO: proper error handling */
BUG_ON(ib_dma_mapping_error(dev, addr));
BUG_ON(i >= SDP_MAX_SEND_SGES);
tx_req->mapping[i] = addr;
sge->addr = addr;
sge->length = mb->m_len;
sge->lkey = ssk->sdp_dev->mr->lkey;
}
tx_wr.next = NULL;
tx_wr.wr_id = mseq | SDP_OP_SEND;
tx_wr.sg_list = ibsge;
tx_wr.num_sge = i;
tx_wr.opcode = IB_WR_SEND;
tx_wr.send_flags = IB_SEND_SIGNALED;
if (unlikely(tx_req->mb->m_flags & M_URG))
tx_wr.send_flags |= IB_SEND_SOLICITED;
rc = ib_post_send(ssk->qp, &tx_wr, &bad_wr);
if (unlikely(rc)) {
sdp_dbg(ssk->socket,
"ib_post_send failed with status %d.\n", rc);
sdp_cleanup_sdp_buf(ssk, tx_req, DMA_TO_DEVICE);
sdp_notify(ssk, ECONNRESET);
m_freem(tx_req->mb);
return;
}
atomic_inc(&ssk->tx_ring.head);
atomic_dec(&ssk->tx_ring.credits);
atomic_set(&ssk->remote_credits, rx_ring_posted(ssk));
return;
}
/* Issue an RDMA_READ using an FRMR to map the data sink */
static int rdma_read_chunk_frmr(struct svcxprt_rdma *xprt,
struct svc_rqst *rqstp,
struct svc_rdma_op_ctxt *head,
int *page_no,
u32 *page_offset,
u32 rs_handle,
u32 rs_length,
u64 rs_offset,
int last)
{
struct ib_send_wr read_wr;
struct ib_send_wr inv_wr;
struct ib_send_wr fastreg_wr;
u8 key;
int pages_needed = PAGE_ALIGN(*page_offset + rs_length) >> PAGE_SHIFT;
struct svc_rdma_op_ctxt *ctxt = svc_rdma_get_context(xprt);
struct svc_rdma_fastreg_mr *frmr = svc_rdma_get_frmr(xprt);
int ret, read, pno;
u32 pg_off = *page_offset;
u32 pg_no = *page_no;
if (IS_ERR(frmr))
return -ENOMEM;
ctxt->direction = DMA_FROM_DEVICE;
ctxt->frmr = frmr;
pages_needed = min_t(int, pages_needed, xprt->sc_frmr_pg_list_len);
read = min_t(int, pages_needed << PAGE_SHIFT, rs_length);
frmr->kva = page_address(rqstp->rq_arg.pages[pg_no]);
frmr->direction = DMA_FROM_DEVICE;
frmr->access_flags = (IB_ACCESS_LOCAL_WRITE|IB_ACCESS_REMOTE_WRITE);
frmr->map_len = pages_needed << PAGE_SHIFT;
frmr->page_list_len = pages_needed;
for (pno = 0; pno < pages_needed; pno++) {
int len = min_t(int, rs_length, PAGE_SIZE - pg_off);
head->arg.pages[pg_no] = rqstp->rq_arg.pages[pg_no];
head->arg.page_len += len;
head->arg.len += len;
if (!pg_off)
head->count++;
rqstp->rq_respages = &rqstp->rq_arg.pages[pg_no+1];
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0))
rqstp->rq_next_page = rqstp->rq_respages + 1;
#endif
frmr->page_list->page_list[pno] =
ib_dma_map_page(xprt->sc_cm_id->device,
head->arg.pages[pg_no], 0,
PAGE_SIZE, DMA_FROM_DEVICE);
ret = ib_dma_mapping_error(xprt->sc_cm_id->device,
frmr->page_list->page_list[pno]);
if (ret)
goto err;
atomic_inc(&xprt->sc_dma_used);
/* adjust offset and wrap to next page if needed */
pg_off += len;
if (pg_off == PAGE_SIZE) {
pg_off = 0;
pg_no++;
}
rs_length -= len;
}
if (last && rs_length == 0)
set_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
else
clear_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
/* Bump the key */
key = (u8)(frmr->mr->lkey & 0x000000FF);
ib_update_fast_reg_key(frmr->mr, ++key);
ctxt->sge[0].addr = (unsigned long)frmr->kva + *page_offset;
ctxt->sge[0].lkey = frmr->mr->lkey;
ctxt->sge[0].length = read;
ctxt->count = 1;
ctxt->read_hdr = head;
/* Prepare FASTREG WR */
memset(&fastreg_wr, 0, sizeof(fastreg_wr));
fastreg_wr.opcode = IB_WR_FAST_REG_MR;
fastreg_wr.send_flags = IB_SEND_SIGNALED;
fastreg_wr.wr.fast_reg.iova_start = (unsigned long)frmr->kva;
fastreg_wr.wr.fast_reg.page_list = frmr->page_list;
fastreg_wr.wr.fast_reg.page_list_len = frmr->page_list_len;
fastreg_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
fastreg_wr.wr.fast_reg.length = frmr->map_len;
fastreg_wr.wr.fast_reg.access_flags = frmr->access_flags;
fastreg_wr.wr.fast_reg.rkey = frmr->mr->lkey;
fastreg_wr.next = &read_wr;
/* Prepare RDMA_READ */
memset(&read_wr, 0, sizeof(read_wr));
read_wr.send_flags = IB_SEND_SIGNALED;
read_wr.wr.rdma.rkey = rs_handle;
read_wr.wr.rdma.remote_addr = rs_offset;
read_wr.sg_list = ctxt->sge;
read_wr.num_sge = 1;
if (xprt->sc_dev_caps & SVCRDMA_DEVCAP_READ_W_INV) {
read_wr.opcode = IB_WR_RDMA_READ_WITH_INV;
read_wr.wr_id = (unsigned long)ctxt;
read_wr.ex.invalidate_rkey = ctxt->frmr->mr->lkey;
} else {
read_wr.opcode = IB_WR_RDMA_READ;
read_wr.next = &inv_wr;
/* Prepare invalidate */
memset(&inv_wr, 0, sizeof(inv_wr));
inv_wr.wr_id = (unsigned long)ctxt;
inv_wr.opcode = IB_WR_LOCAL_INV;
inv_wr.send_flags = IB_SEND_SIGNALED | IB_SEND_FENCE;
inv_wr.ex.invalidate_rkey = frmr->mr->lkey;
}
ctxt->wr_op = read_wr.opcode;
/* Post the chain */
ret = svc_rdma_send(xprt, &fastreg_wr);
if (ret) {
pr_err("svcrdma: Error %d posting RDMA_READ\n", ret);
set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
goto err;
}
/* return current location in page array */
*page_no = pg_no;
*page_offset = pg_off;
ret = read;
atomic_inc(&rdma_stat_read);
return ret;
err:
svc_rdma_unmap_dma(ctxt);
svc_rdma_put_context(ctxt, 0);
svc_rdma_put_frmr(xprt, frmr);
return ret;
}
