1 files changed, 582 insertions, 0 deletions

diff --git a/drivers/net/ehea/ehea_qmr.c b/drivers/net/ehea/ehea_qmr.c
new file mode 100644
index 000000000000..3e1862326c88
--- /dev/null
+++ b/drivers/net/ehea/ehea_qmr.c
@@ -0,0 +1,582 @@
+/*
+ *  linux/drivers/net/ehea/ehea_qmr.c
+ *
+ *  eHEA ethernet device driver for IBM eServer System p
+ *
+ *  (C) Copyright IBM Corp. 2006
+ *
+ *  Authors:
+ *       Christoph Raisch <raisch@de.ibm.com>
+ *       Jan-Bernd Themann <themann@de.ibm.com>
+ *       Thomas Klein <tklein@de.ibm.com>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "ehea.h"
+#include "ehea_phyp.h"
+#include "ehea_qmr.h"
+
+static void *hw_qpageit_get_inc(struct hw_queue *queue)
+{
+        void *retvalue = hw_qeit_get(queue);
+
+        queue->current_q_offset += queue->pagesize;
+        if (queue->current_q_offset > queue->queue_length) {
+                queue->current_q_offset -= queue->pagesize;
+                retvalue = NULL;
+        } else if (((u64) retvalue) & (EHEA_PAGESIZE-1)) {
+                ehea_error("not on pageboundary");
+                retvalue = NULL;
+        }
+        return retvalue;
+}
+
+static int hw_queue_ctor(struct hw_queue *queue, const u32 nr_of_pages,
+                          const u32 pagesize, const u32 qe_size)
+{
+        int pages_per_kpage = PAGE_SIZE / pagesize;
+        int i, k;
+
+        if ((pagesize > PAGE_SIZE) || (!pages_per_kpage)) {
+                ehea_error("pagesize conflict! kernel pagesize=%d, "
+                           "ehea pagesize=%d", (int)PAGE_SIZE, (int)pagesize);
+                return -EINVAL;
+        }
+
+        queue->queue_length = nr_of_pages * pagesize;
+        queue->queue_pages = kmalloc(nr_of_pages * sizeof(void*), GFP_KERNEL);
+        if (!queue->queue_pages) {
+                ehea_error("no mem for queue_pages");
+                return -ENOMEM;
+        }
+
+        /*
+         * allocate pages for queue:
+         * outer loop allocates whole kernel pages (page aligned) and
+         * inner loop divides a kernel page into smaller hea queue pages
+         */
+        i = 0;
+        while (i < nr_of_pages) {
+                u8 *kpage = (u8*)get_zeroed_page(GFP_KERNEL);
+                if (!kpage)
+                        goto out_nomem;
+                for (k = 0; k < pages_per_kpage && i < nr_of_pages; k++) {
+                        (queue->queue_pages)[i] = (struct ehea_page*)kpage;
+                        kpage += pagesize;
+                        i++;
+                }
+        }
+
+        queue->current_q_offset = 0;
+        queue->qe_size = qe_size;
+        queue->pagesize = pagesize;
+        queue->toggle_state = 1;
+
+        return 0;
+out_nomem:
+        for (i = 0; i < nr_of_pages; i += pages_per_kpage) {
+                if (!(queue->queue_pages)[i])
+                        break;
+                free_page((unsigned long)(queue->queue_pages)[i]);
+        }
+        return -ENOMEM;
+}
+
+static void hw_queue_dtor(struct hw_queue *queue)
+{
+        int pages_per_kpage = PAGE_SIZE / queue->pagesize;
+        int i, nr_pages;
+
+        if (!queue || !queue->queue_pages)
+                return;
+
+        nr_pages = queue->queue_length / queue->pagesize;
+
+        for (i = 0; i < nr_pages; i += pages_per_kpage)
+                free_page((unsigned long)(queue->queue_pages)[i]);
+
+        kfree(queue->queue_pages);
+}
+
+struct ehea_cq *ehea_create_cq(struct ehea_adapter *adapter,
+                               int nr_of_cqe, u64 eq_handle, u32 cq_token)
+{
+        struct ehea_cq *cq;
+        struct h_epa epa;
+        u64 *cq_handle_ref, hret, rpage;
+        u32 act_nr_of_entries, act_pages, counter;
+        int ret;
+        void *vpage;
+
+        cq = kzalloc(sizeof(*cq), GFP_KERNEL);
+        if (!cq) {
+                ehea_error("no mem for cq");
+                goto out_nomem;
+        }
+
+        cq->attr.max_nr_of_cqes = nr_of_cqe;
+        cq->attr.cq_token = cq_token;
+        cq->attr.eq_handle = eq_handle;
+
+        cq->adapter = adapter;
+
+        cq_handle_ref = &cq->fw_handle;
+        act_nr_of_entries = 0;
+        act_pages = 0;
+
+        hret = ehea_h_alloc_resource_cq(adapter->handle, &cq->attr,
+                                        &cq->fw_handle, &cq->epas);
+        if (hret != H_SUCCESS) {
+                ehea_error("alloc_resource_cq failed");
+                goto out_freemem;
+        }
+
+        ret = hw_queue_ctor(&cq->hw_queue, cq->attr.nr_pages,
+                            EHEA_PAGESIZE, sizeof(struct ehea_cqe));
+        if (ret)
+                goto out_freeres;
+
+        for (counter = 0; counter < cq->attr.nr_pages; counter++) {
+                vpage = hw_qpageit_get_inc(&cq->hw_queue);
+                if (!vpage) {
+                        ehea_error("hw_qpageit_get_inc failed");
+                        goto out_kill_hwq;
+                }
+
+                rpage = virt_to_abs(vpage);
+                hret = ehea_h_register_rpage(adapter->handle,
+                                             0, EHEA_CQ_REGISTER_ORIG,
+                                             cq->fw_handle, rpage, 1);
+                if (hret < H_SUCCESS) {
+                        ehea_error("register_rpage_cq failed ehea_cq=%p "
+                                   "hret=%lx counter=%i act_pages=%i",
+                                   cq, hret, counter, cq->attr.nr_pages);
+                        goto out_kill_hwq;
+                }
+
+                if (counter == (cq->attr.nr_pages - 1)) {
+                        vpage = hw_qpageit_get_inc(&cq->hw_queue);
+
+                        if ((hret != H_SUCCESS) || (vpage)) {
+                                ehea_error("registration of pages not "
+                                           "complete hret=%lx\n", hret);
+                                goto out_kill_hwq;
+                        }
+                } else {
+                        if ((hret != H_PAGE_REGISTERED) || (!vpage)) {
+                                ehea_error("CQ: registration of page failed "
+                                           "hret=%lx\n", hret);
+                                goto out_kill_hwq;
+                        }
+                }
+        }
+
+        hw_qeit_reset(&cq->hw_queue);
+        epa = cq->epas.kernel;
+        ehea_reset_cq_ep(cq);
+        ehea_reset_cq_n1(cq);
+
+        return cq;
+
+out_kill_hwq:
+        hw_queue_dtor(&cq->hw_queue);
+
+out_freeres:
+        ehea_h_free_resource(adapter->handle, cq->fw_handle);
+
+out_freemem:
+        kfree(cq);
+
+out_nomem:
+        return NULL;
+}
+
+int ehea_destroy_cq(struct ehea_cq *cq)
+{
+        u64 adapter_handle, hret;
+
+        adapter_handle = cq->adapter->handle;
+
+        if (!cq)
+                return 0;
+
+        /* deregister all previous registered pages */
+        hret = ehea_h_free_resource(adapter_handle, cq->fw_handle);
+        if (hret != H_SUCCESS) {
+                ehea_error("destroy CQ failed");
+                return -EIO;
+        }
+
+        hw_queue_dtor(&cq->hw_queue);
+        kfree(cq);
+
+        return 0;
+}
+
+struct ehea_eq *ehea_create_eq(struct ehea_adapter *adapter,
+                               const enum ehea_eq_type type,
+                               const u32 max_nr_of_eqes, const u8 eqe_gen)
+{
+        int ret, i;
+        u64 hret, rpage;
+        void *vpage;
+        struct ehea_eq *eq;
+
+        eq = kzalloc(sizeof(*eq), GFP_KERNEL);
+        if (!eq) {
+                ehea_error("no mem for eq");
+                return NULL;
+        }
+
+        eq->adapter = adapter;
+        eq->attr.type = type;
+        eq->attr.max_nr_of_eqes = max_nr_of_eqes;
+        eq->attr.eqe_gen = eqe_gen;
+        spin_lock_init(&eq->spinlock);
+
+        hret = ehea_h_alloc_resource_eq(adapter->handle,
+                                        &eq->attr, &eq->fw_handle);
+        if (hret != H_SUCCESS) {
+                ehea_error("alloc_resource_eq failed");
+                goto out_freemem;
+        }
+
+        ret = hw_queue_ctor(&eq->hw_queue, eq->attr.nr_pages,
+                            EHEA_PAGESIZE, sizeof(struct ehea_eqe));
+        if (ret) {
+                ehea_error("can't allocate eq pages");
+                goto out_freeres;
+        }
+
+        for (i = 0; i < eq->attr.nr_pages; i++) {
+                vpage = hw_qpageit_get_inc(&eq->hw_queue);
+                if (!vpage) {
+                        ehea_error("hw_qpageit_get_inc failed");
+                        hret = H_RESOURCE;
+                        goto out_kill_hwq;
+                }
+
+                rpage = virt_to_abs(vpage);
+
+                hret = ehea_h_register_rpage(adapter->handle, 0,
+                                             EHEA_EQ_REGISTER_ORIG,
+                                             eq->fw_handle, rpage, 1);
+
+                if (i == (eq->attr.nr_pages - 1)) {
+                        /* last page */
+                        vpage = hw_qpageit_get_inc(&eq->hw_queue);
+                        if ((hret != H_SUCCESS) || (vpage)) {
+                                goto out_kill_hwq;
+                        }
+                } else {
+                        if ((hret != H_PAGE_REGISTERED) || (!vpage)) {
+                                goto out_kill_hwq;
+                        }
+                }
+        }
+
+        hw_qeit_reset(&eq->hw_queue);
+        return eq;
+
+out_kill_hwq:
+        hw_queue_dtor(&eq->hw_queue);
+
+out_freeres:
+        ehea_h_free_resource(adapter->handle, eq->fw_handle);
+
+out_freemem:
+        kfree(eq);
+        return NULL;
+}
+
+struct ehea_eqe *ehea_poll_eq(struct ehea_eq *eq)
+{
+        struct ehea_eqe *eqe;
+        unsigned long flags;
+
+        spin_lock_irqsave(&eq->spinlock, flags);
+        eqe = (struct ehea_eqe*)hw_eqit_eq_get_inc_valid(&eq->hw_queue);
+        spin_unlock_irqrestore(&eq->spinlock, flags);
+
+        return eqe;
+}
+
+int ehea_destroy_eq(struct ehea_eq *eq)
+{
+        u64 hret;
+        unsigned long flags;
+
+        if (!eq)
+                return 0;
+
+        spin_lock_irqsave(&eq->spinlock, flags);
+
+        hret = ehea_h_free_resource(eq->adapter->handle, eq->fw_handle);
+        spin_unlock_irqrestore(&eq->spinlock, flags);
+
+        if (hret != H_SUCCESS) {
+                ehea_error("destroy_eq failed");
+                return -EIO;
+        }
+
+        hw_queue_dtor(&eq->hw_queue);
+        kfree(eq);
+
+        return 0;
+}
+
+/**
+ * allocates memory for a queue and registers pages in phyp
+ */
+int ehea_qp_alloc_register(struct ehea_qp *qp, struct hw_queue *hw_queue,
+                           int nr_pages, int wqe_size, int act_nr_sges,
+                           struct ehea_adapter *adapter, int h_call_q_selector)
+{
+        u64 hret, rpage;
+        int ret, cnt;
+        void *vpage;
+
+        ret = hw_queue_ctor(hw_queue, nr_pages, EHEA_PAGESIZE, wqe_size);
+        if (ret)
+                return ret;
+
+        for (cnt = 0; cnt < nr_pages; cnt++) {
+                vpage = hw_qpageit_get_inc(hw_queue);
+                if (!vpage) {
+                        ehea_error("hw_qpageit_get_inc failed");
+                        goto out_kill_hwq;
+                }
+                rpage = virt_to_abs(vpage);
+                hret = ehea_h_register_rpage(adapter->handle,
+                                             0, h_call_q_selector,
+                                             qp->fw_handle, rpage, 1);
+                if (hret < H_SUCCESS) {
+                        ehea_error("register_rpage_qp failed");
+                        goto out_kill_hwq;
+                }
+        }
+        hw_qeit_reset(hw_queue);
+        return 0;
+
+out_kill_hwq:
+        hw_queue_dtor(hw_queue);
+        return -EIO;
+}
+
+static inline u32 map_wqe_size(u8 wqe_enc_size)
+{
+        return 128 << wqe_enc_size;
+}
+
+struct ehea_qp *ehea_create_qp(struct ehea_adapter *adapter,
+                               u32 pd, struct ehea_qp_init_attr *init_attr)
+{
+        int ret;
+        u64 hret;
+        struct ehea_qp *qp;
+        u32 wqe_size_in_bytes_sq, wqe_size_in_bytes_rq1;
+        u32 wqe_size_in_bytes_rq2, wqe_size_in_bytes_rq3;
+
+
+        qp = kzalloc(sizeof(*qp), GFP_KERNEL);
+        if (!qp) {
+                ehea_error("no mem for qp");
+                return NULL;
+        }
+
+        qp->adapter = adapter;
+
+        hret = ehea_h_alloc_resource_qp(adapter->handle, init_attr, pd,
+                                        &qp->fw_handle, &qp->epas);
+        if (hret != H_SUCCESS) {
+                ehea_error("ehea_h_alloc_resource_qp failed");
+                goto out_freemem;
+        }
+
+        wqe_size_in_bytes_sq = map_wqe_size(init_attr->act_wqe_size_enc_sq);
+        wqe_size_in_bytes_rq1 = map_wqe_size(init_attr->act_wqe_size_enc_rq1);
+        wqe_size_in_bytes_rq2 = map_wqe_size(init_attr->act_wqe_size_enc_rq2);
+        wqe_size_in_bytes_rq3 = map_wqe_size(init_attr->act_wqe_size_enc_rq3);
+
+        ret = ehea_qp_alloc_register(qp, &qp->hw_squeue, init_attr->nr_sq_pages,
+                                     wqe_size_in_bytes_sq,
+                                     init_attr->act_wqe_size_enc_sq, adapter,
+                                     0);
+        if (ret) {
+                ehea_error("can't register for sq ret=%x", ret);
+                goto out_freeres;
+        }
+
+        ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue1,
+                                     init_attr->nr_rq1_pages,
+                                     wqe_size_in_bytes_rq1,
+                                     init_attr->act_wqe_size_enc_rq1,
+                                     adapter, 1);
+        if (ret) {
+                ehea_error("can't register for rq1 ret=%x", ret);
+                goto out_kill_hwsq;
+        }
+
+        if (init_attr->rq_count > 1) {
+                ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue2,
+                                             init_attr->nr_rq2_pages,
+                                             wqe_size_in_bytes_rq2,
+                                             init_attr->act_wqe_size_enc_rq2,
+                                             adapter, 2);
+                if (ret) {
+                        ehea_error("can't register for rq2 ret=%x", ret);
+                        goto out_kill_hwr1q;
+                }
+        }
+
+        if (init_attr->rq_count > 2) {
+                ret = ehea_qp_alloc_register(qp, &qp->hw_rqueue3,
+                                             init_attr->nr_rq3_pages,
+                                             wqe_size_in_bytes_rq3,
+                                             init_attr->act_wqe_size_enc_rq3,
+                                             adapter, 3);
+                if (ret) {
+                        ehea_error("can't register for rq3 ret=%x", ret);
+                        goto out_kill_hwr2q;
+                }
+        }
+
+        qp->init_attr = *init_attr;
+
+        return qp;
+
+out_kill_hwr2q:
+        hw_queue_dtor(&qp->hw_rqueue2);
+
+out_kill_hwr1q:
+        hw_queue_dtor(&qp->hw_rqueue1);
+
+out_kill_hwsq:
+        hw_queue_dtor(&qp->hw_squeue);
+
+out_freeres:
+        ehea_h_disable_and_get_hea(adapter->handle, qp->fw_handle);
+        ehea_h_free_resource(adapter->handle, qp->fw_handle);
+
+out_freemem:
+        kfree(qp);
+        return NULL;
+}
+
+int ehea_destroy_qp(struct ehea_qp *qp)
+{
+        u64 hret;
+        struct ehea_qp_init_attr *qp_attr = &qp->init_attr;
+
+        if (!qp)
+                return 0;
+
+        hret = ehea_h_free_resource(qp->adapter->handle, qp->fw_handle);
+        if (hret != H_SUCCESS) {
+                ehea_error("destroy_qp failed");
+                return -EIO;
+        }
+
+        hw_queue_dtor(&qp->hw_squeue);
+        hw_queue_dtor(&qp->hw_rqueue1);
+
+        if (qp_attr->rq_count > 1)
+                hw_queue_dtor(&qp->hw_rqueue2);
+        if (qp_attr->rq_count > 2)
+                hw_queue_dtor(&qp->hw_rqueue3);
+        kfree(qp);
+
+        return 0;
+}
+
+int ehea_reg_mr_adapter(struct ehea_adapter *adapter)
+{
+        int i, k, ret;
+        u64 hret, pt_abs, start, end, nr_pages;
+        u32 acc_ctrl = EHEA_MR_ACC_CTRL;
+        u64 *pt;
+
+        start = KERNELBASE;
+        end = (u64)high_memory;
+        nr_pages = (end - start) / PAGE_SIZE;
+
+        pt =  kzalloc(PAGE_SIZE, GFP_KERNEL);
+        if (!pt) {
+                ehea_error("no mem");
+                ret = -ENOMEM;
+                goto out;
+        }
+        pt_abs = virt_to_abs(pt);
+
+        hret = ehea_h_alloc_resource_mr(adapter->handle, start, end - start,
+                                        acc_ctrl, adapter->pd,
+                                        &adapter->mr.handle, &adapter->mr.lkey);
+        if (hret != H_SUCCESS) {
+                ehea_error("alloc_resource_mr failed");
+                ret = -EIO;
+                goto out;
+        }
+
+        adapter->mr.vaddr = KERNELBASE;
+        k = 0;
+
+        while (nr_pages > 0) {
+                if (nr_pages > 1) {
+                        u64 num_pages = min(nr_pages, (u64)512);
+                        for (i = 0; i < num_pages; i++)
+                                pt[i] = virt_to_abs((void*)(((u64)start)
+                                                             + ((k++) *
+                                                                PAGE_SIZE)));
+
+                        hret = ehea_h_register_rpage_mr(adapter->handle,
+                                                        adapter->mr.handle, 0,
+                                                        0, (u64)pt_abs,
+                                                        num_pages);
+                        nr_pages -= num_pages;
+                } else {
+                        u64 abs_adr = virt_to_abs((void*)(((u64)start)
+                                                           + (k * PAGE_SIZE)));
+                        hret = ehea_h_register_rpage_mr(adapter->handle,
+                                                        adapter->mr.handle, 0,
+                                                        0, abs_adr,1);
+                        nr_pages--;
+                }
+
+                if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED)) {
+                        ehea_h_free_resource(adapter->handle,
+                                                adapter->mr.handle);
+                        ehea_error("register_rpage_mr failed: hret = %lX",
+                                   hret);
+                        ret = -EIO;
+                        goto out;
+                }
+        }
+
+        if (hret != H_SUCCESS) {
+                ehea_h_free_resource(adapter->handle, adapter->mr.handle);
+                ehea_error("register_rpage failed for last page: hret = %lX",
+                           hret);
+                ret = -EIO;
+                goto out;
+        }
+        ret = 0;
+out:
+        kfree(pt);
+        return ret;
+}
+
+