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#include <linux/gfp.h>
#include <linux/workqueue.h>
#include <crypto/internal/skcipher.h>
#include "nitrox_dev.h"
#include "nitrox_req.h"
#include "nitrox_csr.h"
#include "nitrox_req.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 PENDING_SIG 0xFFFFFFFFFFFFFFFFUL
#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.
*/
/**
* dma_free_sglist - unmap and free the sg lists.
* @ndev: N5 device
* @sgtbl: SG table
*/
static void softreq_unmap_sgbufs(struct nitrox_softreq *sr)
{
struct nitrox_device *ndev = sr->ndev;
struct device *dev = DEV(ndev);
struct nitrox_sglist *sglist;
/* unmap in sgbuf */
sglist = sr->in.sglist;
if (!sglist)
goto out_unmap;
/* unmap iv */
dma_unmap_single(dev, sglist->dma, sglist->len, DMA_BIDIRECTIONAL);
/* unmpa src sglist */
dma_unmap_sg(dev, sr->in.buf, (sr->in.map_bufs_cnt - 1), sr->in.dir);
/* unamp gather component */
dma_unmap_single(dev, sr->in.dma, sr->in.len, DMA_TO_DEVICE);
kfree(sr->in.sglist);
kfree(sr->in.sgcomp);
sr->in.sglist = NULL;
sr->in.buf = NULL;
sr->in.map_bufs_cnt = 0;
out_unmap:
/* unmap out sgbuf */
sglist = sr->out.sglist;
if (!sglist)
return;
/* unmap orh */
dma_unmap_single(dev, sr->resp.orh_dma, ORH_HLEN, sr->out.dir);
/* unmap dst sglist */
if (!sr->inplace) {
dma_unmap_sg(dev, sr->out.buf, (sr->out.map_bufs_cnt - 3),
sr->out.dir);
}
/* unmap completion */
dma_unmap_single(dev, sr->resp.completion_dma, COMP_HLEN, sr->out.dir);
/* unmap scatter component */
dma_unmap_single(dev, sr->out.dma, sr->out.len, DMA_TO_DEVICE);
kfree(sr->out.sglist);
kfree(sr->out.sgcomp);
sr->out.sglist = NULL;
sr->out.buf = NULL;
sr->out.map_bufs_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
* @nr_comp: total number of components required
*
* 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 nitrox_sglist *sglist;
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;
sgtbl->nr_sgcomp = nr_sgcomp;
sglist = sgtbl->sglist;
/* populate device sg component */
for (i = 0; i < nr_sgcomp; i++) {
for (j = 0; j < 4; j++) {
sgcomp->len[j] = cpu_to_be16(sglist->len);
sgcomp->dma[j] = cpu_to_be64(sglist->dma);
sglist++;
}
sgcomp++;
}
/* 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->dma = dma;
sgtbl->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 = req->src;
struct nitrox_sglist *glist;
int i, nents, ret = 0;
dma_addr_t dma;
size_t sz;
nents = sg_nents(req->src);
/* creater gather list IV and src entries */
sz = roundup((1 + nents), 4) * sizeof(*glist);
glist = kzalloc(sz, sr->gfp);
if (!glist)
return -ENOMEM;
sr->in.sglist = glist;
/* map IV */
dma = dma_map_single(dev, &req->iv, req->ivsize, DMA_BIDIRECTIONAL);
if (dma_mapping_error(dev, dma)) {
ret = -EINVAL;
goto iv_map_err;
}
sr->in.dir = (req->src == req->dst) ? DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
/* map src entries */
nents = dma_map_sg(dev, req->src, nents, sr->in.dir);
if (!nents) {
ret = -EINVAL;
goto src_map_err;
}
sr->in.buf = req->src;
/* store the mappings */
glist->len = req->ivsize;
glist->dma = dma;
glist++;
sr->in.total_bytes += req->ivsize;
for_each_sg(req->src, sg, nents, i) {
glist->len = sg_dma_len(sg);
glist->dma = sg_dma_address(sg);
sr->in.total_bytes += glist->len;
glist++;
}
/* roundup map count to align with entires in sg component */
sr->in.map_bufs_cnt = (1 + nents);
/* create NITROX gather component */
ret = create_sg_component(sr, &sr->in, sr->in.map_bufs_cnt);
if (ret)
goto incomp_err;
return 0;
incomp_err:
dma_unmap_sg(dev, req->src, nents, sr->in.dir);
sr->in.map_bufs_cnt = 0;
src_map_err:
dma_unmap_single(dev, dma, req->ivsize, DMA_BIDIRECTIONAL);
iv_map_err:
kfree(sr->in.sglist);
sr->in.sglist = NULL;
return ret;
}
static int dma_map_outbufs(struct nitrox_softreq *sr,
struct se_crypto_request *req)
{
struct device *dev = DEV(sr->ndev);
struct nitrox_sglist *glist = sr->in.sglist;
struct nitrox_sglist *slist;
struct scatterlist *sg;
int i, nents, map_bufs_cnt, ret = 0;
size_t sz;
nents = sg_nents(req->dst);
/* create scatter list ORH, IV, dst entries and Completion header */
sz = roundup((3 + nents), 4) * sizeof(*slist);
slist = kzalloc(sz, sr->gfp);
if (!slist)
return -ENOMEM;
sr->out.sglist = slist;
sr->out.dir = DMA_BIDIRECTIONAL;
/* map ORH */
sr->resp.orh_dma = dma_map_single(dev, &sr->resp.orh, ORH_HLEN,
sr->out.dir);
if (dma_mapping_error(dev, sr->resp.orh_dma)) {
ret = -EINVAL;
goto orh_map_err;
}
/* map completion */
sr->resp.completion_dma = dma_map_single(dev, &sr->resp.completion,
COMP_HLEN, sr->out.dir);
if (dma_mapping_error(dev, sr->resp.completion_dma)) {
ret = -EINVAL;
goto compl_map_err;
}
sr->inplace = (req->src == req->dst) ? true : false;
/* out place */
if (!sr->inplace) {
nents = dma_map_sg(dev, req->dst, nents, sr->out.dir);
if (!nents) {
ret = -EINVAL;
goto dst_map_err;
}
}
sr->out.buf = req->dst;
/* store the mappings */
/* orh */
slist->len = ORH_HLEN;
slist->dma = sr->resp.orh_dma;
slist++;
/* copy the glist mappings */
if (sr->inplace) {
nents = sr->in.map_bufs_cnt - 1;
map_bufs_cnt = sr->in.map_bufs_cnt;
while (map_bufs_cnt--) {
slist->len = glist->len;
slist->dma = glist->dma;
slist++;
glist++;
}
} else {
/* copy iv mapping */
slist->len = glist->len;
slist->dma = glist->dma;
slist++;
/* copy remaining maps */
for_each_sg(req->dst, sg, nents, i) {
slist->len = sg_dma_len(sg);
slist->dma = sg_dma_address(sg);
slist++;
}
}
/* completion */
slist->len = COMP_HLEN;
slist->dma = sr->resp.completion_dma;
sr->out.map_bufs_cnt = (3 + nents);
ret = create_sg_component(sr, &sr->out, sr->out.map_bufs_cnt);
if (ret)
goto outcomp_map_err;
return 0;
outcomp_map_err:
if (!sr->inplace)
dma_unmap_sg(dev, req->dst, nents, sr->out.dir);
sr->out.map_bufs_cnt = 0;
sr->out.buf = NULL;
dst_map_err:
dma_unmap_single(dev, sr->resp.completion_dma, COMP_HLEN, sr->out.dir);
sr->resp.completion_dma = 0;
compl_map_err:
dma_unmap_single(dev, sr->resp.orh_dma, ORH_HLEN, sr->out.dir);
sr->resp.orh_dma = 0;
orh_map_err:
kfree(sr->out.sglist);
sr->out.sglist = 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_lock);
list_add_tail(&sr->backlog, &cmdq->backlog_head);
atomic_inc(&cmdq->backlog_count);
atomic_set(&sr->status, REQ_BACKLOG);
spin_unlock_bh(&cmdq->backlog_lock);
}
static inline void response_list_add(struct nitrox_softreq *sr,
struct nitrox_cmdq *cmdq)
{
INIT_LIST_HEAD(&sr->response);
spin_lock_bh(&cmdq->response_lock);
list_add_tail(&sr->response, &cmdq->response_head);
spin_unlock_bh(&cmdq->response_lock);
}
static inline void response_list_del(struct nitrox_softreq *sr,
struct nitrox_cmdq *cmdq)
{
spin_lock_bh(&cmdq->response_lock);
list_del(&sr->response);
spin_unlock_bh(&cmdq->response_lock);
}
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;
}
return false;
}
/**
* post_se_instr - Post SE instruction to Packet Input ring
* @sr: Request 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;
union nps_pkt_in_instr_baoff_dbell pkt_in_baoff_dbell;
u64 offset;
u8 *ent;
spin_lock_bh(&cmdq->cmdq_lock);
/* get the next write offset */
offset = NPS_PKT_IN_INSTR_BAOFF_DBELLX(cmdq->qno);
pkt_in_baoff_dbell.value = nitrox_read_csr(ndev, offset);
/* copy the instruction */
ent = cmdq->head + pkt_in_baoff_dbell.s.aoff;
memcpy(ent, &sr->instr, cmdq->instr_size);
/* flush the command queue updates */
dma_wmb();
sr->tstamp = jiffies;
atomic_set(&sr->status, REQ_POSTED);
response_list_add(sr, cmdq);
/* Ring doorbell with count 1 */
writeq(1, cmdq->dbell_csr_addr);
/* orders the doorbell rings */
mmiowb();
spin_unlock_bh(&cmdq->cmdq_lock);
}
static int post_backlog_cmds(struct nitrox_cmdq *cmdq)
{
struct nitrox_device *ndev = cmdq->ndev;
struct nitrox_softreq *sr, *tmp;
int ret = 0;
spin_lock_bh(&cmdq->backlog_lock);
list_for_each_entry_safe(sr, tmp, &cmdq->backlog_head, backlog) {
struct skcipher_request *skreq;
/* submit until space available */
if (unlikely(cmdq_full(cmdq, ndev->qlen))) {
ret = -EBUSY;
break;
}
/* delete from backlog list */
list_del(&sr->backlog);
atomic_dec(&cmdq->backlog_count);
/* sync with other cpus */
smp_mb__after_atomic();
skreq = sr->skreq;
/* post the command */
post_se_instr(sr, cmdq);
/* backlog requests are posted, wakeup with -EINPROGRESS */
skcipher_request_complete(skreq, -EINPROGRESS);
}
spin_unlock_bh(&cmdq->backlog_lock);
return ret;
}
static int nitrox_enqueue_request(struct nitrox_softreq *sr)
{
struct nitrox_cmdq *cmdq = sr->cmdq;
struct nitrox_device *ndev = sr->ndev;
int ret = -EBUSY;
if (unlikely(cmdq_full(cmdq, ndev->qlen))) {
if (!(sr->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
return -EAGAIN;
backlog_list_add(sr, cmdq);
} else {
ret = post_backlog_cmds(cmdq);
if (ret) {
backlog_list_add(sr, cmdq);
return ret;
}
post_se_instr(sr, cmdq);
ret = -EINPROGRESS;
}
return ret;
}
/**
* nitrox_se_request - Send request to SE core
* @ndev: NITROX device
* @req: Crypto request
*
* 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,
struct skcipher_request *skreq)
{
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->skreq = skreq;
atomic_set(&sr->status, REQ_NOT_POSTED);
WRITE_ONCE(sr->resp.orh, PENDING_SIG);
WRITE_ONCE(sr->resp.completion, PENDING_SIG);
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_cmdqs[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.dma);
/* word 1 */
sr->instr.ih.value = 0;
sr->instr.ih.s.g = 1;
sr->instr.ih.s.gsz = sr->in.map_bufs_cnt;
sr->instr.ih.s.ssz = sr->out.map_bufs_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.value = 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.value[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.map_bufs_cnt;
sr->instr.slc.value[0] = cpu_to_be64(sr->instr.slc.value[0]);
/* word 5 */
sr->instr.slc.s.rptr = cpu_to_be64(sr->out.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;
/* flush the soft_req changes before posting the cmd */
wmb();
ret = nitrox_enqueue_request(sr);
if (ret == -EAGAIN)
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);
}
/**
* process_request_list - process completed requests
* @ndev: N5 device
* @qno: queue to operate
*
* 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;
struct skcipher_request *skreq;
completion_t callback;
int req_completed = 0, err = 0, budget;
/* 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 (READ_ONCE(sr->resp.orh) == READ_ONCE(sr->resp.completion)) {
/* 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);
/* sync with other cpus */
smp_mb__after_atomic();
/* remove from response list */
response_list_del(sr, cmdq);
callback = sr->callback;
skreq = sr->skreq;
/* ORH error code */
err = READ_ONCE(sr->resp.orh) & 0xff;
softreq_destroy(sr);
if (callback)
callback(skreq, err);
req_completed++;
}
}
/**
* pkt_slc_resp_handler - post processing of SE responses
*/
void pkt_slc_resp_handler(unsigned long data)
{
struct bh_data *bh = (void *)(uintptr_t)(data);
struct nitrox_cmdq *cmdq = bh->cmdq;
union nps_pkt_slc_cnts pkt_slc_cnts;
/* read completion count */
pkt_slc_cnts.value = readq(bh->completion_cnt_csr_addr);
/* resend the interrupt if more work to do */
pkt_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(pkt_slc_cnts.value, bh->completion_cnt_csr_addr);
/* order the writes */
mmiowb();
if (atomic_read(&cmdq->backlog_count))
schedule_work(&cmdq->backlog_qflush);
}
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