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-rw-r--r--drivers/crypto/cavium/nitrox/nitrox_reqmgr.c607
1 files changed, 607 insertions, 0 deletions
diff --git a/drivers/crypto/cavium/nitrox/nitrox_reqmgr.c b/drivers/crypto/cavium/nitrox/nitrox_reqmgr.c
new file mode 100644
index 000000000..55c18da4a
--- /dev/null
+++ b/drivers/crypto/cavium/nitrox/nitrox_reqmgr.c
@@ -0,0 +1,607 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/gfp.h>
+#include <linux/workqueue.h>
+#include <crypto/internal/skcipher.h>
+
+#include "nitrox_common.h"
+#include "nitrox_dev.h"
+#include "nitrox_req.h"
+#include "nitrox_csr.h"
+
+/* SLC_STORE_INFO */
+#define MIN_UDD_LEN 16
+/* PKT_IN_HDR + SLC_STORE_INFO */
+#define FDATA_SIZE 32
+/* Base destination port for the solicited requests */
+#define SOLICIT_BASE_DPORT 256
+
+#define REQ_NOT_POSTED 1
+#define REQ_BACKLOG 2
+#define REQ_POSTED 3
+
+/*
+ * Response codes from SE microcode
+ * 0x00 - Success
+ * Completion with no error
+ * 0x43 - ERR_GC_DATA_LEN_INVALID
+ * Invalid Data length if Encryption Data length is
+ * less than 16 bytes for AES-XTS and AES-CTS.
+ * 0x45 - ERR_GC_CTX_LEN_INVALID
+ * Invalid context length: CTXL != 23 words.
+ * 0x4F - ERR_GC_DOCSIS_CIPHER_INVALID
+ * DOCSIS support is enabled with other than
+ * AES/DES-CBC mode encryption.
+ * 0x50 - ERR_GC_DOCSIS_OFFSET_INVALID
+ * Authentication offset is other than 0 with
+ * Encryption IV source = 0.
+ * Authentication offset is other than 8 (DES)/16 (AES)
+ * with Encryption IV source = 1
+ * 0x51 - ERR_GC_CRC32_INVALID_SELECTION
+ * CRC32 is enabled for other than DOCSIS encryption.
+ * 0x52 - ERR_GC_AES_CCM_FLAG_INVALID
+ * Invalid flag options in AES-CCM IV.
+ */
+
+static inline int incr_index(int index, int count, int max)
+{
+ if ((index + count) >= max)
+ index = index + count - max;
+ else
+ index += count;
+
+ return index;
+}
+
+static void softreq_unmap_sgbufs(struct nitrox_softreq *sr)
+{
+ struct nitrox_device *ndev = sr->ndev;
+ struct device *dev = DEV(ndev);
+
+
+ dma_unmap_sg(dev, sr->in.sg, sg_nents(sr->in.sg),
+ DMA_BIDIRECTIONAL);
+ dma_unmap_single(dev, sr->in.sgcomp_dma, sr->in.sgcomp_len,
+ DMA_TO_DEVICE);
+ kfree(sr->in.sgcomp);
+ sr->in.sg = NULL;
+ sr->in.sgmap_cnt = 0;
+
+ dma_unmap_sg(dev, sr->out.sg, sg_nents(sr->out.sg),
+ DMA_BIDIRECTIONAL);
+ dma_unmap_single(dev, sr->out.sgcomp_dma, sr->out.sgcomp_len,
+ DMA_TO_DEVICE);
+ kfree(sr->out.sgcomp);
+ sr->out.sg = NULL;
+ sr->out.sgmap_cnt = 0;
+}
+
+static void softreq_destroy(struct nitrox_softreq *sr)
+{
+ softreq_unmap_sgbufs(sr);
+ kfree(sr);
+}
+
+/**
+ * create_sg_component - create SG componets for N5 device.
+ * @sr: Request structure
+ * @sgtbl: SG table
+ * @map_nents: number of dma mapped entries
+ *
+ * Component structure
+ *
+ * 63 48 47 32 31 16 15 0
+ * --------------------------------------
+ * | LEN0 | LEN1 | LEN2 | LEN3 |
+ * |-------------------------------------
+ * | PTR0 |
+ * --------------------------------------
+ * | PTR1 |
+ * --------------------------------------
+ * | PTR2 |
+ * --------------------------------------
+ * | PTR3 |
+ * --------------------------------------
+ *
+ * Returns 0 if success or a negative errno code on error.
+ */
+static int create_sg_component(struct nitrox_softreq *sr,
+ struct nitrox_sgtable *sgtbl, int map_nents)
+{
+ struct nitrox_device *ndev = sr->ndev;
+ struct nitrox_sgcomp *sgcomp;
+ struct scatterlist *sg;
+ dma_addr_t dma;
+ size_t sz_comp;
+ int i, j, nr_sgcomp;
+
+ nr_sgcomp = roundup(map_nents, 4) / 4;
+
+ /* each component holds 4 dma pointers */
+ sz_comp = nr_sgcomp * sizeof(*sgcomp);
+ sgcomp = kzalloc(sz_comp, sr->gfp);
+ if (!sgcomp)
+ return -ENOMEM;
+
+ sgtbl->sgcomp = sgcomp;
+
+ sg = sgtbl->sg;
+ /* populate device sg component */
+ for (i = 0; i < nr_sgcomp; i++) {
+ for (j = 0; j < 4 && sg; j++) {
+ sgcomp[i].len[j] = cpu_to_be16(sg_dma_len(sg));
+ sgcomp[i].dma[j] = cpu_to_be64(sg_dma_address(sg));
+ sg = sg_next(sg);
+ }
+ }
+ /* map the device sg component */
+ dma = dma_map_single(DEV(ndev), sgtbl->sgcomp, sz_comp, DMA_TO_DEVICE);
+ if (dma_mapping_error(DEV(ndev), dma)) {
+ kfree(sgtbl->sgcomp);
+ sgtbl->sgcomp = NULL;
+ return -ENOMEM;
+ }
+
+ sgtbl->sgcomp_dma = dma;
+ sgtbl->sgcomp_len = sz_comp;
+
+ return 0;
+}
+
+/**
+ * dma_map_inbufs - DMA map input sglist and creates sglist component
+ * for N5 device.
+ * @sr: Request structure
+ * @req: Crypto request structre
+ *
+ * Returns 0 if successful or a negative errno code on error.
+ */
+static int dma_map_inbufs(struct nitrox_softreq *sr,
+ struct se_crypto_request *req)
+{
+ struct device *dev = DEV(sr->ndev);
+ struct scatterlist *sg;
+ int i, nents, ret = 0;
+
+ nents = dma_map_sg(dev, req->src, sg_nents(req->src),
+ DMA_BIDIRECTIONAL);
+ if (!nents)
+ return -EINVAL;
+
+ for_each_sg(req->src, sg, nents, i)
+ sr->in.total_bytes += sg_dma_len(sg);
+
+ sr->in.sg = req->src;
+ sr->in.sgmap_cnt = nents;
+ ret = create_sg_component(sr, &sr->in, sr->in.sgmap_cnt);
+ if (ret)
+ goto incomp_err;
+
+ return 0;
+
+incomp_err:
+ dma_unmap_sg(dev, req->src, sg_nents(req->src), DMA_BIDIRECTIONAL);
+ sr->in.sgmap_cnt = 0;
+ return ret;
+}
+
+static int dma_map_outbufs(struct nitrox_softreq *sr,
+ struct se_crypto_request *req)
+{
+ struct device *dev = DEV(sr->ndev);
+ int nents, ret = 0;
+
+ nents = dma_map_sg(dev, req->dst, sg_nents(req->dst),
+ DMA_BIDIRECTIONAL);
+ if (!nents)
+ return -EINVAL;
+
+ sr->out.sg = req->dst;
+ sr->out.sgmap_cnt = nents;
+ ret = create_sg_component(sr, &sr->out, sr->out.sgmap_cnt);
+ if (ret)
+ goto outcomp_map_err;
+
+ return 0;
+
+outcomp_map_err:
+ dma_unmap_sg(dev, req->dst, sg_nents(req->dst), DMA_BIDIRECTIONAL);
+ sr->out.sgmap_cnt = 0;
+ sr->out.sg = NULL;
+ return ret;
+}
+
+static inline int softreq_map_iobuf(struct nitrox_softreq *sr,
+ struct se_crypto_request *creq)
+{
+ int ret;
+
+ ret = dma_map_inbufs(sr, creq);
+ if (ret)
+ return ret;
+
+ ret = dma_map_outbufs(sr, creq);
+ if (ret)
+ softreq_unmap_sgbufs(sr);
+
+ return ret;
+}
+
+static inline void backlog_list_add(struct nitrox_softreq *sr,
+ struct nitrox_cmdq *cmdq)
+{
+ INIT_LIST_HEAD(&sr->backlog);
+
+ spin_lock_bh(&cmdq->backlog_qlock);
+ list_add_tail(&sr->backlog, &cmdq->backlog_head);
+ atomic_inc(&cmdq->backlog_count);
+ atomic_set(&sr->status, REQ_BACKLOG);
+ spin_unlock_bh(&cmdq->backlog_qlock);
+}
+
+static inline void response_list_add(struct nitrox_softreq *sr,
+ struct nitrox_cmdq *cmdq)
+{
+ INIT_LIST_HEAD(&sr->response);
+
+ spin_lock_bh(&cmdq->resp_qlock);
+ list_add_tail(&sr->response, &cmdq->response_head);
+ spin_unlock_bh(&cmdq->resp_qlock);
+}
+
+static inline void response_list_del(struct nitrox_softreq *sr,
+ struct nitrox_cmdq *cmdq)
+{
+ spin_lock_bh(&cmdq->resp_qlock);
+ list_del(&sr->response);
+ spin_unlock_bh(&cmdq->resp_qlock);
+}
+
+static struct nitrox_softreq *
+get_first_response_entry(struct nitrox_cmdq *cmdq)
+{
+ return list_first_entry_or_null(&cmdq->response_head,
+ struct nitrox_softreq, response);
+}
+
+static inline bool cmdq_full(struct nitrox_cmdq *cmdq, int qlen)
+{
+ if (atomic_inc_return(&cmdq->pending_count) > qlen) {
+ atomic_dec(&cmdq->pending_count);
+ /* sync with other cpus */
+ smp_mb__after_atomic();
+ return true;
+ }
+ /* sync with other cpus */
+ smp_mb__after_atomic();
+ return false;
+}
+
+/**
+ * post_se_instr - Post SE instruction to Packet Input ring
+ * @sr: Request structure
+ * @cmdq: Command queue structure
+ *
+ * Returns 0 if successful or a negative error code,
+ * if no space in ring.
+ */
+static void post_se_instr(struct nitrox_softreq *sr,
+ struct nitrox_cmdq *cmdq)
+{
+ struct nitrox_device *ndev = sr->ndev;
+ int idx;
+ u8 *ent;
+
+ spin_lock_bh(&cmdq->cmd_qlock);
+
+ idx = cmdq->write_idx;
+ /* copy the instruction */
+ ent = cmdq->base + (idx * cmdq->instr_size);
+ memcpy(ent, &sr->instr, cmdq->instr_size);
+
+ atomic_set(&sr->status, REQ_POSTED);
+ response_list_add(sr, cmdq);
+ sr->tstamp = jiffies;
+ /* flush the command queue updates */
+ dma_wmb();
+
+ /* Ring doorbell with count 1 */
+ writeq(1, cmdq->dbell_csr_addr);
+
+ cmdq->write_idx = incr_index(idx, 1, ndev->qlen);
+
+ spin_unlock_bh(&cmdq->cmd_qlock);
+
+ /* increment the posted command count */
+ atomic64_inc(&ndev->stats.posted);
+}
+
+static int post_backlog_cmds(struct nitrox_cmdq *cmdq)
+{
+ struct nitrox_device *ndev = cmdq->ndev;
+ struct nitrox_softreq *sr, *tmp;
+ int ret = 0;
+
+ if (!atomic_read(&cmdq->backlog_count))
+ return 0;
+
+ spin_lock_bh(&cmdq->backlog_qlock);
+
+ list_for_each_entry_safe(sr, tmp, &cmdq->backlog_head, backlog) {
+ /* submit until space available */
+ if (unlikely(cmdq_full(cmdq, ndev->qlen))) {
+ ret = -ENOSPC;
+ break;
+ }
+ /* delete from backlog list */
+ list_del(&sr->backlog);
+ atomic_dec(&cmdq->backlog_count);
+ /* sync with other cpus */
+ smp_mb__after_atomic();
+
+ /* post the command */
+ post_se_instr(sr, cmdq);
+ }
+ spin_unlock_bh(&cmdq->backlog_qlock);
+
+ return ret;
+}
+
+static int nitrox_enqueue_request(struct nitrox_softreq *sr)
+{
+ struct nitrox_cmdq *cmdq = sr->cmdq;
+ struct nitrox_device *ndev = sr->ndev;
+
+ /* try to post backlog requests */
+ post_backlog_cmds(cmdq);
+
+ if (unlikely(cmdq_full(cmdq, ndev->qlen))) {
+ if (!(sr->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
+ /* increment drop count */
+ atomic64_inc(&ndev->stats.dropped);
+ return -ENOSPC;
+ }
+ /* add to backlog list */
+ backlog_list_add(sr, cmdq);
+ return -EINPROGRESS;
+ }
+ post_se_instr(sr, cmdq);
+
+ return -EINPROGRESS;
+}
+
+/**
+ * nitrox_process_se_request - Send request to SE core
+ * @ndev: NITROX device
+ * @req: Crypto request
+ * @callback: Completion callback
+ * @cb_arg: Completion callback arguments
+ *
+ * Returns 0 on success, or a negative error code.
+ */
+int nitrox_process_se_request(struct nitrox_device *ndev,
+ struct se_crypto_request *req,
+ completion_t callback,
+ void *cb_arg)
+{
+ struct nitrox_softreq *sr;
+ dma_addr_t ctx_handle = 0;
+ int qno, ret = 0;
+
+ if (!nitrox_ready(ndev))
+ return -ENODEV;
+
+ sr = kzalloc(sizeof(*sr), req->gfp);
+ if (!sr)
+ return -ENOMEM;
+
+ sr->ndev = ndev;
+ sr->flags = req->flags;
+ sr->gfp = req->gfp;
+ sr->callback = callback;
+ sr->cb_arg = cb_arg;
+
+ atomic_set(&sr->status, REQ_NOT_POSTED);
+
+ sr->resp.orh = req->orh;
+ sr->resp.completion = req->comp;
+
+ ret = softreq_map_iobuf(sr, req);
+ if (ret) {
+ kfree(sr);
+ return ret;
+ }
+
+ /* get the context handle */
+ if (req->ctx_handle) {
+ struct ctx_hdr *hdr;
+ u8 *ctx_ptr;
+
+ ctx_ptr = (u8 *)(uintptr_t)req->ctx_handle;
+ hdr = (struct ctx_hdr *)(ctx_ptr - sizeof(struct ctx_hdr));
+ ctx_handle = hdr->ctx_dma;
+ }
+
+ /* select the queue */
+ qno = smp_processor_id() % ndev->nr_queues;
+
+ sr->cmdq = &ndev->pkt_inq[qno];
+
+ /*
+ * 64-Byte Instruction Format
+ *
+ * ----------------------
+ * | DPTR0 | 8 bytes
+ * ----------------------
+ * | PKT_IN_INSTR_HDR | 8 bytes
+ * ----------------------
+ * | PKT_IN_HDR | 16 bytes
+ * ----------------------
+ * | SLC_INFO | 16 bytes
+ * ----------------------
+ * | Front data | 16 bytes
+ * ----------------------
+ */
+
+ /* fill the packet instruction */
+ /* word 0 */
+ sr->instr.dptr0 = cpu_to_be64(sr->in.sgcomp_dma);
+
+ /* word 1 */
+ sr->instr.ih.value = 0;
+ sr->instr.ih.s.g = 1;
+ sr->instr.ih.s.gsz = sr->in.sgmap_cnt;
+ sr->instr.ih.s.ssz = sr->out.sgmap_cnt;
+ sr->instr.ih.s.fsz = FDATA_SIZE + sizeof(struct gphdr);
+ sr->instr.ih.s.tlen = sr->instr.ih.s.fsz + sr->in.total_bytes;
+ sr->instr.ih.bev = cpu_to_be64(sr->instr.ih.value);
+
+ /* word 2 */
+ sr->instr.irh.value[0] = 0;
+ sr->instr.irh.s.uddl = MIN_UDD_LEN;
+ /* context length in 64-bit words */
+ sr->instr.irh.s.ctxl = (req->ctrl.s.ctxl / 8);
+ /* offset from solicit base port 256 */
+ sr->instr.irh.s.destport = SOLICIT_BASE_DPORT + qno;
+ sr->instr.irh.s.ctxc = req->ctrl.s.ctxc;
+ sr->instr.irh.s.arg = req->ctrl.s.arg;
+ sr->instr.irh.s.opcode = req->opcode;
+ sr->instr.irh.bev[0] = cpu_to_be64(sr->instr.irh.value[0]);
+
+ /* word 3 */
+ sr->instr.irh.s.ctxp = cpu_to_be64(ctx_handle);
+
+ /* word 4 */
+ sr->instr.slc.value[0] = 0;
+ sr->instr.slc.s.ssz = sr->out.sgmap_cnt;
+ sr->instr.slc.bev[0] = cpu_to_be64(sr->instr.slc.value[0]);
+
+ /* word 5 */
+ sr->instr.slc.s.rptr = cpu_to_be64(sr->out.sgcomp_dma);
+
+ /*
+ * No conversion for front data,
+ * It goes into payload
+ * put GP Header in front data
+ */
+ sr->instr.fdata[0] = *((u64 *)&req->gph);
+ sr->instr.fdata[1] = 0;
+
+ ret = nitrox_enqueue_request(sr);
+ if (ret == -ENOSPC)
+ goto send_fail;
+
+ return ret;
+
+send_fail:
+ softreq_destroy(sr);
+ return ret;
+}
+
+static inline int cmd_timeout(unsigned long tstamp, unsigned long timeout)
+{
+ return time_after_eq(jiffies, (tstamp + timeout));
+}
+
+void backlog_qflush_work(struct work_struct *work)
+{
+ struct nitrox_cmdq *cmdq;
+
+ cmdq = container_of(work, struct nitrox_cmdq, backlog_qflush);
+ post_backlog_cmds(cmdq);
+}
+
+static bool sr_completed(struct nitrox_softreq *sr)
+{
+ u64 orh = READ_ONCE(*sr->resp.orh);
+ unsigned long timeout = jiffies + msecs_to_jiffies(1);
+
+ if ((orh != PENDING_SIG) && (orh & 0xff))
+ return true;
+
+ while (READ_ONCE(*sr->resp.completion) == PENDING_SIG) {
+ if (time_after(jiffies, timeout)) {
+ pr_err("comp not done\n");
+ return false;
+ }
+ }
+
+ return true;
+}
+
+/**
+ * process_response_list - process completed requests
+ * @cmdq: Command queue structure
+ *
+ * Returns the number of responses processed.
+ */
+static void process_response_list(struct nitrox_cmdq *cmdq)
+{
+ struct nitrox_device *ndev = cmdq->ndev;
+ struct nitrox_softreq *sr;
+ int req_completed = 0, err = 0, budget;
+ completion_t callback;
+ void *cb_arg;
+
+ /* check all pending requests */
+ budget = atomic_read(&cmdq->pending_count);
+
+ while (req_completed < budget) {
+ sr = get_first_response_entry(cmdq);
+ if (!sr)
+ break;
+
+ if (atomic_read(&sr->status) != REQ_POSTED)
+ break;
+
+ /* check orh and completion bytes updates */
+ if (!sr_completed(sr)) {
+ /* request not completed, check for timeout */
+ if (!cmd_timeout(sr->tstamp, ndev->timeout))
+ break;
+ dev_err_ratelimited(DEV(ndev),
+ "Request timeout, orh 0x%016llx\n",
+ READ_ONCE(*sr->resp.orh));
+ }
+ atomic_dec(&cmdq->pending_count);
+ atomic64_inc(&ndev->stats.completed);
+ /* sync with other cpus */
+ smp_mb__after_atomic();
+ /* remove from response list */
+ response_list_del(sr, cmdq);
+ /* ORH error code */
+ err = READ_ONCE(*sr->resp.orh) & 0xff;
+ callback = sr->callback;
+ cb_arg = sr->cb_arg;
+ softreq_destroy(sr);
+ if (callback)
+ callback(cb_arg, err);
+
+ req_completed++;
+ }
+}
+
+/*
+ * pkt_slc_resp_tasklet - post processing of SE responses
+ */
+void pkt_slc_resp_tasklet(unsigned long data)
+{
+ struct nitrox_q_vector *qvec = (void *)(uintptr_t)(data);
+ struct nitrox_cmdq *cmdq = qvec->cmdq;
+ union nps_pkt_slc_cnts slc_cnts;
+
+ /* read completion count */
+ slc_cnts.value = readq(cmdq->compl_cnt_csr_addr);
+ /* resend the interrupt if more work to do */
+ slc_cnts.s.resend = 1;
+
+ process_response_list(cmdq);
+
+ /*
+ * clear the interrupt with resend bit enabled,
+ * MSI-X interrupt generates if Completion count > Threshold
+ */
+ writeq(slc_cnts.value, cmdq->compl_cnt_csr_addr);
+
+ if (atomic_read(&cmdq->backlog_count))
+ schedule_work(&cmdq->backlog_qflush);
+}
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