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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2016 Chelsio Communications, Inc.
*/
#include "cxgbit.h"
static void
cxgbit_set_one_ppod(struct cxgbi_pagepod *ppod,
struct cxgbi_task_tag_info *ttinfo,
struct scatterlist **sg_pp, unsigned int *sg_off)
{
struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
unsigned int offset = sg_off ? *sg_off : 0;
dma_addr_t addr = 0UL;
unsigned int len = 0;
int i;
memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
if (sg) {
addr = sg_dma_address(sg);
len = sg_dma_len(sg);
}
for (i = 0; i < PPOD_PAGES_MAX; i++) {
if (sg) {
ppod->addr[i] = cpu_to_be64(addr + offset);
offset += PAGE_SIZE;
if (offset == (len + sg->offset)) {
offset = 0;
sg = sg_next(sg);
if (sg) {
addr = sg_dma_address(sg);
len = sg_dma_len(sg);
}
}
} else {
ppod->addr[i] = 0ULL;
}
}
/*
* the fifth address needs to be repeated in the next ppod, so do
* not move sg
*/
if (sg_pp) {
*sg_pp = sg;
*sg_off = offset;
}
if (offset == len) {
offset = 0;
if (sg) {
sg = sg_next(sg);
if (sg)
addr = sg_dma_address(sg);
}
}
ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
}
static struct sk_buff *
cxgbit_ppod_init_idata(struct cxgbit_device *cdev, struct cxgbi_ppm *ppm,
unsigned int idx, unsigned int npods, unsigned int tid)
{
struct ulp_mem_io *req;
struct ulptx_idata *idata;
unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ppm->llimit;
unsigned int dlen = npods << PPOD_SIZE_SHIFT;
unsigned int wr_len = roundup(sizeof(struct ulp_mem_io) +
sizeof(struct ulptx_idata) + dlen, 16);
struct sk_buff *skb;
skb = alloc_skb(wr_len, GFP_KERNEL);
if (!skb)
return NULL;
req = __skb_put(skb, wr_len);
INIT_ULPTX_WR(req, wr_len, 0, tid);
req->wr.wr_hi = htonl(FW_WR_OP_V(FW_ULPTX_WR) |
FW_WR_ATOMIC_V(0));
req->cmd = htonl(ULPTX_CMD_V(ULP_TX_MEM_WRITE) |
ULP_MEMIO_ORDER_V(0) |
T5_ULP_MEMIO_IMM_V(1));
req->dlen = htonl(ULP_MEMIO_DATA_LEN_V(dlen >> 5));
req->lock_addr = htonl(ULP_MEMIO_ADDR_V(pm_addr >> 5));
req->len16 = htonl(DIV_ROUND_UP(wr_len - sizeof(req->wr), 16));
idata = (struct ulptx_idata *)(req + 1);
idata->cmd_more = htonl(ULPTX_CMD_V(ULP_TX_SC_IMM));
idata->len = htonl(dlen);
return skb;
}
static int
cxgbit_ppod_write_idata(struct cxgbi_ppm *ppm, struct cxgbit_sock *csk,
struct cxgbi_task_tag_info *ttinfo, unsigned int idx,
unsigned int npods, struct scatterlist **sg_pp,
unsigned int *sg_off)
{
struct cxgbit_device *cdev = csk->com.cdev;
struct sk_buff *skb;
struct ulp_mem_io *req;
struct ulptx_idata *idata;
struct cxgbi_pagepod *ppod;
unsigned int i;
skb = cxgbit_ppod_init_idata(cdev, ppm, idx, npods, csk->tid);
if (!skb)
return -ENOMEM;
req = (struct ulp_mem_io *)skb->data;
idata = (struct ulptx_idata *)(req + 1);
ppod = (struct cxgbi_pagepod *)(idata + 1);
for (i = 0; i < npods; i++, ppod++)
cxgbit_set_one_ppod(ppod, ttinfo, sg_pp, sg_off);
__skb_queue_tail(&csk->ppodq, skb);
return 0;
}
static int
cxgbit_ddp_set_map(struct cxgbi_ppm *ppm, struct cxgbit_sock *csk,
struct cxgbi_task_tag_info *ttinfo)
{
unsigned int pidx = ttinfo->idx;
unsigned int npods = ttinfo->npods;
unsigned int i, cnt;
struct scatterlist *sg = ttinfo->sgl;
unsigned int offset = 0;
int ret = 0;
for (i = 0; i < npods; i += cnt, pidx += cnt) {
cnt = npods - i;
if (cnt > ULPMEM_IDATA_MAX_NPPODS)
cnt = ULPMEM_IDATA_MAX_NPPODS;
ret = cxgbit_ppod_write_idata(ppm, csk, ttinfo, pidx, cnt,
&sg, &offset);
if (ret < 0)
break;
}
return ret;
}
static int cxgbit_ddp_sgl_check(struct scatterlist *sg,
unsigned int nents)
{
unsigned int last_sgidx = nents - 1;
unsigned int i;
for (i = 0; i < nents; i++, sg = sg_next(sg)) {
unsigned int len = sg->length + sg->offset;
if ((sg->offset & 0x3) || (i && sg->offset) ||
((i != last_sgidx) && (len != PAGE_SIZE))) {
return -EINVAL;
}
}
return 0;
}
static int
cxgbit_ddp_reserve(struct cxgbit_sock *csk, struct cxgbi_task_tag_info *ttinfo,
unsigned int xferlen)
{
struct cxgbit_device *cdev = csk->com.cdev;
struct cxgbi_ppm *ppm = cdev2ppm(cdev);
struct scatterlist *sgl = ttinfo->sgl;
unsigned int sgcnt = ttinfo->nents;
unsigned int sg_offset = sgl->offset;
int ret;
if ((xferlen < DDP_THRESHOLD) || (!sgcnt)) {
pr_debug("ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
ppm, ppm->tformat.pgsz_idx_dflt,
xferlen, ttinfo->nents);
return -EINVAL;
}
if (cxgbit_ddp_sgl_check(sgl, sgcnt) < 0)
return -EINVAL;
ttinfo->nr_pages = (xferlen + sgl->offset +
(1 << PAGE_SHIFT) - 1) >> PAGE_SHIFT;
/*
* the ddp tag will be used for the ttt in the outgoing r2t pdu
*/
ret = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
&ttinfo->tag, 0);
if (ret < 0)
return ret;
ttinfo->npods = ret;
sgl->offset = 0;
ret = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
sgl->offset = sg_offset;
if (!ret) {
pr_debug("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
__func__, 0, xferlen, sgcnt);
goto rel_ppods;
}
cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
xferlen, &ttinfo->hdr);
ret = cxgbit_ddp_set_map(ppm, csk, ttinfo);
if (ret < 0) {
__skb_queue_purge(&csk->ppodq);
dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
goto rel_ppods;
}
return 0;
rel_ppods:
cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
return -EINVAL;
}
void
cxgbit_get_r2t_ttt(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
struct iscsi_r2t *r2t)
{
struct cxgbit_sock *csk = conn->context;
struct cxgbit_device *cdev = csk->com.cdev;
struct cxgbit_cmd *ccmd = iscsit_priv_cmd(cmd);
struct cxgbi_task_tag_info *ttinfo = &ccmd->ttinfo;
int ret = -EINVAL;
if ((!ccmd->setup_ddp) ||
(!test_bit(CSK_DDP_ENABLE, &csk->com.flags)))
goto out;
ccmd->setup_ddp = false;
ttinfo->sgl = cmd->se_cmd.t_data_sg;
ttinfo->nents = cmd->se_cmd.t_data_nents;
ret = cxgbit_ddp_reserve(csk, ttinfo, cmd->se_cmd.data_length);
if (ret < 0) {
pr_debug("csk 0x%p, cmd 0x%p, xfer len %u, sgcnt %u no ddp.\n",
csk, cmd, cmd->se_cmd.data_length, ttinfo->nents);
ttinfo->sgl = NULL;
ttinfo->nents = 0;
} else {
ccmd->release = true;
}
out:
pr_debug("cdev 0x%p, cmd 0x%p, tag 0x%x\n", cdev, cmd, ttinfo->tag);
r2t->targ_xfer_tag = ttinfo->tag;
}
void cxgbit_unmap_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
{
struct cxgbit_cmd *ccmd = iscsit_priv_cmd(cmd);
if (ccmd->release) {
struct cxgbi_task_tag_info *ttinfo = &ccmd->ttinfo;
if (ttinfo->sgl) {
struct cxgbit_sock *csk = conn->context;
struct cxgbit_device *cdev = csk->com.cdev;
struct cxgbi_ppm *ppm = cdev2ppm(cdev);
/* Abort the TCP conn if DDP is not complete to
* avoid any possibility of DDP after freeing
* the cmd.
*/
if (unlikely(cmd->write_data_done !=
cmd->se_cmd.data_length))
cxgbit_abort_conn(csk);
cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl,
ttinfo->nents, DMA_FROM_DEVICE);
} else {
put_page(sg_page(&ccmd->sg));
}
ccmd->release = false;
}
}
int cxgbit_ddp_init(struct cxgbit_device *cdev)
{
struct cxgb4_lld_info *lldi = &cdev->lldi;
struct net_device *ndev = cdev->lldi.ports[0];
struct cxgbi_tag_format tformat;
unsigned int ppmax;
int ret, i;
if (!lldi->vr->iscsi.size) {
pr_warn("%s, iscsi NOT enabled, check config!\n", ndev->name);
return -EACCES;
}
ppmax = lldi->vr->iscsi.size >> PPOD_SIZE_SHIFT;
memset(&tformat, 0, sizeof(struct cxgbi_tag_format));
for (i = 0; i < 4; i++)
tformat.pgsz_order[i] = (lldi->iscsi_pgsz_order >> (i << 3))
& 0xF;
cxgbi_tagmask_check(lldi->iscsi_tagmask, &tformat);
ret = cxgbi_ppm_init(lldi->iscsi_ppm, cdev->lldi.ports[0],
cdev->lldi.pdev, &cdev->lldi, &tformat,
ppmax, lldi->iscsi_llimit,
lldi->vr->iscsi.start, 2);
if (ret >= 0) {
struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*lldi->iscsi_ppm);
if ((ppm->tformat.pgsz_idx_dflt < DDP_PGIDX_MAX) &&
(ppm->ppmax >= 1024))
set_bit(CDEV_DDP_ENABLE, &cdev->flags);
ret = 0;
}
return ret;
}
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