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// SPDX-License-Identifier: GPL-2.0
/* Marvell OcteonTx2 RVU Virtual Function ethernet driver
*
* Copyright (C) 2019 Marvell International Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/etherdevice.h>
#include <linux/pci.h>
#include "otx2_common.h"
#include "otx2_reg.h"
#include "otx2_struct.h"
#include "rvu_fixes.h"
/* serialize device removal and xmit */
DEFINE_MUTEX(remove_lock);
static char pkt_data[64] = { 0x00, 0x0f, 0xb7, 0x11, 0xa6, 0x87, 0x02, 0xe0,
0x28, 0xa5, 0xf6, 0x00, 0x08, 0x00, 0x45, 0x00,
0x00, 0x32, 0x00, 0x00, 0x00, 0x00, 0x04, 0x11,
0xee, 0x53, 0x50, 0x50, 0x50, 0x02, 0x14, 0x14,
0x14, 0x02, 0x10, 0x00, 0x10, 0x01, 0x00, 0x1e,
0x00, 0x00, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e,
0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76 };
static struct sk_buff *the_skb;
static struct otx2_nic *the_smqvf;
static u16 drop_entry = 0xFFFF;
static bool is_otx2_smqvf(struct otx2_nic *vf)
{
if (vf->pcifunc == RVU_SMQVF_PCIFUNC &&
(is_96xx_A0(vf->pdev) || is_95xx_A0(vf->pdev)))
return true;
return false;
}
static void otx2_sqe_flush(struct otx2_snd_queue *sq, int size)
{
u64 status;
/* Packet data stores should finish before SQE is flushed to HW */
dma_wmb();
do {
memcpy(sq->lmt_addr, sq->sqe_base, size);
status = otx2_lmt_flush(sq->io_addr);
} while (status == 0);
sq->head++;
sq->head &= (sq->sqe_cnt - 1);
}
static int otx2_ctx_update(struct otx2_nic *vf, u16 qidx)
{
struct nix_aq_enq_req *sq_aq, *rq_aq, *cq_aq;
/* Do not link CQ for SQ and disable RQ, CQ */
sq_aq = otx2_mbox_alloc_msg_nix_aq_enq(&vf->mbox);
if (!sq_aq)
return -ENOMEM;
sq_aq->sq.cq_ena = 0;
sq_aq->sq_mask.cq_ena = 1;
sq_aq->qidx = qidx;
sq_aq->ctype = NIX_AQ_CTYPE_SQ;
sq_aq->op = NIX_AQ_INSTOP_WRITE;
rq_aq = otx2_mbox_alloc_msg_nix_aq_enq(&vf->mbox);
if (!rq_aq)
return -ENOMEM;
rq_aq->rq.ena = 0;
rq_aq->rq_mask.ena = 1;
rq_aq->qidx = qidx;
rq_aq->ctype = NIX_AQ_CTYPE_RQ;
rq_aq->op = NIX_AQ_INSTOP_WRITE;
cq_aq = otx2_mbox_alloc_msg_nix_aq_enq(&vf->mbox);
if (!cq_aq)
return -ENOMEM;
cq_aq->cq.ena = 0;
cq_aq->cq_mask.ena = 1;
cq_aq->qidx = qidx;
cq_aq->ctype = NIX_AQ_CTYPE_CQ;
cq_aq->op = NIX_AQ_INSTOP_WRITE;
return otx2_sync_mbox_msg(&vf->mbox);
}
void otx2smqvf_xmit(void)
{
struct otx2_snd_queue *sq;
int i, size;
mutex_lock(&remove_lock);
if (!the_smqvf) {
mutex_unlock(&remove_lock);
return;
}
sq = &the_smqvf->qset.sq[0];
/* Min. set of send descriptors required to send packets */
size = sizeof(struct nix_sqe_hdr_s) + sizeof(struct nix_sqe_sg_s) +
sizeof(struct nix_sqe_ext_s) + sizeof(u64);
for (i = 0; i < 256; i++)
otx2_sqe_flush(sq, size);
mutex_unlock(&remove_lock);
}
EXPORT_SYMBOL(otx2smqvf_xmit);
static int otx2smqvf_install_flow(struct otx2_nic *vf)
{
struct npc_mcam_alloc_entry_req *alloc_req;
struct npc_mcam_free_entry_req *free_req;
struct npc_install_flow_req *install_req;
struct npc_mcam_alloc_entry_rsp *rsp;
struct msg_req *msg;
int err, qid;
size_t size;
void *data;
size = SKB_DATA_ALIGN(64 + OTX2_ALIGN) + NET_SKB_PAD +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
err = -ENOMEM;
data = kzalloc(size, GFP_KERNEL);
if (!data)
return err;
memcpy(data, &pkt_data, 64);
the_skb = build_skb(data, 0);
the_skb->len = 64;
for (qid = 0; qid < vf->hw.tx_queues; qid++) {
err = otx2_ctx_update(vf, qid);
/* If something wrong with Q0 then treat as error */
if (err && !qid)
goto err_free_mem;
}
otx2_mbox_lock(&vf->mbox);
alloc_req = otx2_mbox_alloc_msg_npc_mcam_alloc_entry(&vf->mbox);
if (!alloc_req) {
otx2_mbox_unlock(&vf->mbox);
goto err_free_mem;
}
alloc_req->count = 1;
alloc_req->contig = true;
/* Send message to AF */
if (otx2_sync_mbox_msg(&vf->mbox)) {
err = -EINVAL;
otx2_mbox_unlock(&vf->mbox);
goto err_free_mem;
}
otx2_mbox_unlock(&vf->mbox);
rsp = (struct npc_mcam_alloc_entry_rsp *)otx2_mbox_get_rsp
(&vf->mbox.mbox, 0, &alloc_req->hdr);
drop_entry = rsp->entry;
otx2_mbox_lock(&vf->mbox);
/* Send messages to drop Tx packets at NPC and stop Rx traffic */
install_req = otx2_mbox_alloc_msg_npc_install_flow(&vf->mbox);
if (!install_req) {
err = -ENOMEM;
otx2_mbox_unlock(&vf->mbox);
goto err_free_entry;
}
u64_to_ether_addr(0x0ull, install_req->mask.dmac);
install_req->entry = drop_entry;
install_req->features = BIT_ULL(NPC_DMAC);
install_req->intf = NIX_INTF_TX;
install_req->op = NIX_TX_ACTIONOP_DROP;
install_req->set_cntr = 1;
msg = otx2_mbox_alloc_msg_nix_lf_stop_rx(&vf->mbox);
if (!msg) {
otx2_mbox_unlock(&vf->mbox);
goto err_free_entry;
}
/* Send message to AF */
if (otx2_sync_mbox_msg(&vf->mbox)) {
err = -EINVAL;
otx2_mbox_unlock(&vf->mbox);
goto err_free_entry;
}
otx2_mbox_unlock(&vf->mbox);
otx2_sq_append_skb(vf->netdev, &vf->qset.sq[0], the_skb, 0);
return 0;
err_free_entry:
otx2_mbox_lock(&vf->mbox);
free_req = otx2_mbox_alloc_msg_npc_mcam_free_entry(&vf->mbox);
if (!free_req) {
dev_err(vf->dev, "Could not allocate msg for freeing entry\n");
} else {
free_req->entry = drop_entry;
WARN_ON(otx2_sync_mbox_msg(&vf->mbox));
}
otx2_mbox_unlock(&vf->mbox);
err_free_mem:
kfree_skb(the_skb);
drop_entry = 0xFFFF;
return err;
}
int otx2smqvf_probe(struct otx2_nic *vf)
{
int err;
if (!is_otx2_smqvf(vf))
return -EPERM;
err = otx2_open(vf->netdev);
if (err)
return -EINVAL;
/* Disable QINT interrupts because we do not use a CQ for SQ and
* drop TX packets intentionally
*/
otx2_write64(vf, NIX_LF_QINTX_ENA_W1C(0), BIT_ULL(0));
err = otx2smqvf_install_flow(vf);
if (err) {
otx2_stop(vf->netdev);
return -EINVAL;
}
the_smqvf = vf;
return 0;
}
int otx2smqvf_remove(struct otx2_nic *vf)
{
struct npc_mcam_free_entry_req *free_req;
struct npc_delete_flow_req *del_req;
if (!is_otx2_smqvf(vf))
return -EPERM;
mutex_lock(&remove_lock);
kfree_skb(the_skb);
the_smqvf = NULL;
the_skb = NULL;
mutex_unlock(&remove_lock);
otx2_mbox_lock(&vf->mbox);
del_req = otx2_mbox_alloc_msg_npc_delete_flow(&vf->mbox);
free_req = otx2_mbox_alloc_msg_npc_mcam_free_entry(&vf->mbox);
if (!del_req || !free_req) {
dev_err(vf->dev, "Could not allocate msg for freeing entry\n");
} else {
del_req->entry = drop_entry;
free_req->entry = drop_entry;
WARN_ON(otx2_sync_mbox_msg(&vf->mbox));
}
otx2_mbox_unlock(&vf->mbox);
otx2_stop(vf->netdev);
drop_entry = 0xFFFF;
return 0;
}
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