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path: root/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
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Diffstat (limited to 'drivers/net/ethernet/cavium/thunder/nicvf_queues.c')
-rw-r--r--drivers/net/ethernet/cavium/thunder/nicvf_queues.c184
1 files changed, 145 insertions, 39 deletions
diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
index ac0390be3b12..f13289f0d238 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c
@@ -10,6 +10,7 @@
#include <linux/netdevice.h>
#include <linux/ip.h>
#include <linux/etherdevice.h>
+#include <linux/iommu.h>
#include <net/ip.h>
#include <net/tso.h>
@@ -18,6 +19,16 @@
#include "q_struct.h"
#include "nicvf_queues.h"
+#define NICVF_PAGE_ORDER ((PAGE_SIZE <= 4096) ? PAGE_ALLOC_COSTLY_ORDER : 0)
+
+static inline u64 nicvf_iova_to_phys(struct nicvf *nic, dma_addr_t dma_addr)
+{
+ /* Translation is installed only when IOMMU is present */
+ if (nic->iommu_domain)
+ return iommu_iova_to_phys(nic->iommu_domain, dma_addr);
+ return dma_addr;
+}
+
static void nicvf_get_page(struct nicvf *nic)
{
if (!nic->rb_pageref || !nic->rb_page)
@@ -87,7 +98,7 @@ static void nicvf_free_q_desc_mem(struct nicvf *nic, struct q_desc_mem *dmem)
static inline int nicvf_alloc_rcv_buffer(struct nicvf *nic, gfp_t gfp,
u32 buf_len, u64 **rbuf)
{
- int order = (PAGE_SIZE <= 4096) ? PAGE_ALLOC_COSTLY_ORDER : 0;
+ int order = NICVF_PAGE_ORDER;
/* Check if request can be accomodated in previous allocated page */
if (nic->rb_page &&
@@ -97,22 +108,27 @@ static inline int nicvf_alloc_rcv_buffer(struct nicvf *nic, gfp_t gfp,
}
nicvf_get_page(nic);
- nic->rb_page = NULL;
/* Allocate a new page */
+ nic->rb_page = alloc_pages(gfp | __GFP_COMP | __GFP_NOWARN,
+ order);
if (!nic->rb_page) {
- nic->rb_page = alloc_pages(gfp | __GFP_COMP | __GFP_NOWARN,
- order);
- if (!nic->rb_page) {
- this_cpu_inc(nic->pnicvf->drv_stats->
- rcv_buffer_alloc_failures);
- return -ENOMEM;
- }
- nic->rb_page_offset = 0;
+ this_cpu_inc(nic->pnicvf->drv_stats->rcv_buffer_alloc_failures);
+ return -ENOMEM;
}
-
+ nic->rb_page_offset = 0;
ret:
- *rbuf = (u64 *)((u64)page_address(nic->rb_page) + nic->rb_page_offset);
+ /* HW will ensure data coherency, CPU sync not required */
+ *rbuf = (u64 *)((u64)dma_map_page_attrs(&nic->pdev->dev, nic->rb_page,
+ nic->rb_page_offset, buf_len,
+ DMA_FROM_DEVICE,
+ DMA_ATTR_SKIP_CPU_SYNC));
+ if (dma_mapping_error(&nic->pdev->dev, (dma_addr_t)*rbuf)) {
+ if (!nic->rb_page_offset)
+ __free_pages(nic->rb_page, order);
+ nic->rb_page = NULL;
+ return -ENOMEM;
+ }
nic->rb_page_offset += buf_len;
return 0;
@@ -158,16 +174,21 @@ static int nicvf_init_rbdr(struct nicvf *nic, struct rbdr *rbdr,
rbdr->dma_size = buf_size;
rbdr->enable = true;
rbdr->thresh = RBDR_THRESH;
+ rbdr->head = 0;
+ rbdr->tail = 0;
nic->rb_page = NULL;
for (idx = 0; idx < ring_len; idx++) {
err = nicvf_alloc_rcv_buffer(nic, GFP_KERNEL, RCV_FRAG_LEN,
&rbuf);
- if (err)
+ if (err) {
+ /* To free already allocated and mapped ones */
+ rbdr->tail = idx - 1;
return err;
+ }
desc = GET_RBDR_DESC(rbdr, idx);
- desc->buf_addr = virt_to_phys(rbuf) >> NICVF_RCV_BUF_ALIGN;
+ desc->buf_addr = (u64)rbuf >> NICVF_RCV_BUF_ALIGN;
}
nicvf_get_page(nic);
@@ -179,7 +200,7 @@ static int nicvf_init_rbdr(struct nicvf *nic, struct rbdr *rbdr,
static void nicvf_free_rbdr(struct nicvf *nic, struct rbdr *rbdr)
{
int head, tail;
- u64 buf_addr;
+ u64 buf_addr, phys_addr;
struct rbdr_entry_t *desc;
if (!rbdr)
@@ -192,18 +213,26 @@ static void nicvf_free_rbdr(struct nicvf *nic, struct rbdr *rbdr)
head = rbdr->head;
tail = rbdr->tail;
- /* Free SKBs */
+ /* Release page references */
while (head != tail) {
desc = GET_RBDR_DESC(rbdr, head);
- buf_addr = desc->buf_addr << NICVF_RCV_BUF_ALIGN;
- put_page(virt_to_page(phys_to_virt(buf_addr)));
+ buf_addr = ((u64)desc->buf_addr) << NICVF_RCV_BUF_ALIGN;
+ phys_addr = nicvf_iova_to_phys(nic, buf_addr);
+ dma_unmap_page_attrs(&nic->pdev->dev, buf_addr, RCV_FRAG_LEN,
+ DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
+ if (phys_addr)
+ put_page(virt_to_page(phys_to_virt(phys_addr)));
head++;
head &= (rbdr->dmem.q_len - 1);
}
- /* Free SKB of tail desc */
+ /* Release buffer of tail desc */
desc = GET_RBDR_DESC(rbdr, tail);
- buf_addr = desc->buf_addr << NICVF_RCV_BUF_ALIGN;
- put_page(virt_to_page(phys_to_virt(buf_addr)));
+ buf_addr = ((u64)desc->buf_addr) << NICVF_RCV_BUF_ALIGN;
+ phys_addr = nicvf_iova_to_phys(nic, buf_addr);
+ dma_unmap_page_attrs(&nic->pdev->dev, buf_addr, RCV_FRAG_LEN,
+ DMA_FROM_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
+ if (phys_addr)
+ put_page(virt_to_page(phys_to_virt(phys_addr)));
/* Free RBDR ring */
nicvf_free_q_desc_mem(nic, &rbdr->dmem);
@@ -250,7 +279,7 @@ refill:
break;
desc = GET_RBDR_DESC(rbdr, tail);
- desc->buf_addr = virt_to_phys(rbuf) >> NICVF_RCV_BUF_ALIGN;
+ desc->buf_addr = (u64)rbuf >> NICVF_RCV_BUF_ALIGN;
refill_rb_cnt--;
new_rb++;
}
@@ -361,9 +390,29 @@ static int nicvf_init_snd_queue(struct nicvf *nic,
return 0;
}
+void nicvf_unmap_sndq_buffers(struct nicvf *nic, struct snd_queue *sq,
+ int hdr_sqe, u8 subdesc_cnt)
+{
+ u8 idx;
+ struct sq_gather_subdesc *gather;
+
+ /* Unmap DMA mapped skb data buffers */
+ for (idx = 0; idx < subdesc_cnt; idx++) {
+ hdr_sqe++;
+ hdr_sqe &= (sq->dmem.q_len - 1);
+ gather = (struct sq_gather_subdesc *)GET_SQ_DESC(sq, hdr_sqe);
+ /* HW will ensure data coherency, CPU sync not required */
+ dma_unmap_page_attrs(&nic->pdev->dev, gather->addr,
+ gather->size, DMA_TO_DEVICE,
+ DMA_ATTR_SKIP_CPU_SYNC);
+ }
+}
+
static void nicvf_free_snd_queue(struct nicvf *nic, struct snd_queue *sq)
{
struct sk_buff *skb;
+ struct sq_hdr_subdesc *hdr;
+ struct sq_hdr_subdesc *tso_sqe;
if (!sq)
return;
@@ -379,8 +428,22 @@ static void nicvf_free_snd_queue(struct nicvf *nic, struct snd_queue *sq)
smp_rmb();
while (sq->head != sq->tail) {
skb = (struct sk_buff *)sq->skbuff[sq->head];
- if (skb)
- dev_kfree_skb_any(skb);
+ if (!skb)
+ goto next;
+ hdr = (struct sq_hdr_subdesc *)GET_SQ_DESC(sq, sq->head);
+ /* Check for dummy descriptor used for HW TSO offload on 88xx */
+ if (hdr->dont_send) {
+ /* Get actual TSO descriptors and unmap them */
+ tso_sqe =
+ (struct sq_hdr_subdesc *)GET_SQ_DESC(sq, hdr->rsvd2);
+ nicvf_unmap_sndq_buffers(nic, sq, hdr->rsvd2,
+ tso_sqe->subdesc_cnt);
+ } else {
+ nicvf_unmap_sndq_buffers(nic, sq, sq->head,
+ hdr->subdesc_cnt);
+ }
+ dev_kfree_skb_any(skb);
+next:
sq->head++;
sq->head &= (sq->dmem.q_len - 1);
}
@@ -559,9 +622,11 @@ static void nicvf_rcv_queue_config(struct nicvf *nic, struct queue_set *qs,
nicvf_send_msg_to_pf(nic, &mbx);
if (!nic->sqs_mode && (qidx == 0)) {
- /* Enable checking L3/L4 length and TCP/UDP checksums */
+ /* Enable checking L3/L4 length and TCP/UDP checksums
+ * Also allow IPv6 pkts with zero UDP checksum.
+ */
nicvf_queue_reg_write(nic, NIC_QSET_RQ_GEN_CFG, 0,
- (BIT(24) | BIT(23) | BIT(21)));
+ (BIT(24) | BIT(23) | BIT(21) | BIT(20)));
nicvf_config_vlan_stripping(nic, nic->netdev->features);
}
@@ -882,6 +947,14 @@ static inline int nicvf_get_sq_desc(struct snd_queue *sq, int desc_cnt)
return qentry;
}
+/* Rollback to previous tail pointer when descriptors not used */
+static inline void nicvf_rollback_sq_desc(struct snd_queue *sq,
+ int qentry, int desc_cnt)
+{
+ sq->tail = qentry;
+ atomic_add(desc_cnt, &sq->free_cnt);
+}
+
/* Free descriptor back to SQ for future use */
void nicvf_put_sq_desc(struct snd_queue *sq, int desc_cnt)
{
@@ -1207,8 +1280,9 @@ int nicvf_sq_append_skb(struct nicvf *nic, struct snd_queue *sq,
struct sk_buff *skb, u8 sq_num)
{
int i, size;
- int subdesc_cnt, tso_sqe = 0;
+ int subdesc_cnt, hdr_sqe = 0;
int qentry;
+ u64 dma_addr;
subdesc_cnt = nicvf_sq_subdesc_required(nic, skb);
if (subdesc_cnt > atomic_read(&sq->free_cnt))
@@ -1223,12 +1297,21 @@ int nicvf_sq_append_skb(struct nicvf *nic, struct snd_queue *sq,
/* Add SQ header subdesc */
nicvf_sq_add_hdr_subdesc(nic, sq, qentry, subdesc_cnt - 1,
skb, skb->len);
- tso_sqe = qentry;
+ hdr_sqe = qentry;
/* Add SQ gather subdescs */
qentry = nicvf_get_nxt_sqentry(sq, qentry);
size = skb_is_nonlinear(skb) ? skb_headlen(skb) : skb->len;
- nicvf_sq_add_gather_subdesc(sq, qentry, size, virt_to_phys(skb->data));
+ /* HW will ensure data coherency, CPU sync not required */
+ dma_addr = dma_map_page_attrs(&nic->pdev->dev, virt_to_page(skb->data),
+ offset_in_page(skb->data), size,
+ DMA_TO_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
+ if (dma_mapping_error(&nic->pdev->dev, dma_addr)) {
+ nicvf_rollback_sq_desc(sq, qentry, subdesc_cnt);
+ return 0;
+ }
+
+ nicvf_sq_add_gather_subdesc(sq, qentry, size, dma_addr);
/* Check for scattered buffer */
if (!skb_is_nonlinear(skb))
@@ -1241,15 +1324,26 @@ int nicvf_sq_append_skb(struct nicvf *nic, struct snd_queue *sq,
qentry = nicvf_get_nxt_sqentry(sq, qentry);
size = skb_frag_size(frag);
- nicvf_sq_add_gather_subdesc(sq, qentry, size,
- virt_to_phys(
- skb_frag_address(frag)));
+ dma_addr = dma_map_page_attrs(&nic->pdev->dev,
+ skb_frag_page(frag),
+ frag->page_offset, size,
+ DMA_TO_DEVICE,
+ DMA_ATTR_SKIP_CPU_SYNC);
+ if (dma_mapping_error(&nic->pdev->dev, dma_addr)) {
+ /* Free entire chain of mapped buffers
+ * here 'i' = frags mapped + above mapped skb->data
+ */
+ nicvf_unmap_sndq_buffers(nic, sq, hdr_sqe, i);
+ nicvf_rollback_sq_desc(sq, qentry, subdesc_cnt);
+ return 0;
+ }
+ nicvf_sq_add_gather_subdesc(sq, qentry, size, dma_addr);
}
doorbell:
if (nic->t88 && skb_shinfo(skb)->gso_size) {
qentry = nicvf_get_nxt_sqentry(sq, qentry);
- nicvf_sq_add_cqe_subdesc(sq, qentry, tso_sqe, skb);
+ nicvf_sq_add_cqe_subdesc(sq, qentry, hdr_sqe, skb);
}
nicvf_sq_doorbell(nic, skb, sq_num, subdesc_cnt);
@@ -1282,6 +1376,7 @@ struct sk_buff *nicvf_get_rcv_skb(struct nicvf *nic, struct cqe_rx_t *cqe_rx)
int offset;
u16 *rb_lens = NULL;
u64 *rb_ptrs = NULL;
+ u64 phys_addr;
rb_lens = (void *)cqe_rx + (3 * sizeof(u64));
/* Except 88xx pass1 on all other chips CQE_RX2_S is added to
@@ -1296,15 +1391,23 @@ struct sk_buff *nicvf_get_rcv_skb(struct nicvf *nic, struct cqe_rx_t *cqe_rx)
else
rb_ptrs = (void *)cqe_rx + (7 * sizeof(u64));
- netdev_dbg(nic->netdev, "%s rb_cnt %d rb0_ptr %llx rb0_sz %d\n",
- __func__, cqe_rx->rb_cnt, cqe_rx->rb0_ptr, cqe_rx->rb0_sz);
-
for (frag = 0; frag < cqe_rx->rb_cnt; frag++) {
payload_len = rb_lens[frag_num(frag)];
+ phys_addr = nicvf_iova_to_phys(nic, *rb_ptrs);
+ if (!phys_addr) {
+ if (skb)
+ dev_kfree_skb_any(skb);
+ return NULL;
+ }
+
if (!frag) {
/* First fragment */
+ dma_unmap_page_attrs(&nic->pdev->dev,
+ *rb_ptrs - cqe_rx->align_pad,
+ RCV_FRAG_LEN, DMA_FROM_DEVICE,
+ DMA_ATTR_SKIP_CPU_SYNC);
skb = nicvf_rb_ptr_to_skb(nic,
- *rb_ptrs - cqe_rx->align_pad,
+ phys_addr - cqe_rx->align_pad,
payload_len);
if (!skb)
return NULL;
@@ -1312,8 +1415,11 @@ struct sk_buff *nicvf_get_rcv_skb(struct nicvf *nic, struct cqe_rx_t *cqe_rx)
skb_put(skb, payload_len);
} else {
/* Add fragments */
- page = virt_to_page(phys_to_virt(*rb_ptrs));
- offset = phys_to_virt(*rb_ptrs) - page_address(page);
+ dma_unmap_page_attrs(&nic->pdev->dev, *rb_ptrs,
+ RCV_FRAG_LEN, DMA_FROM_DEVICE,
+ DMA_ATTR_SKIP_CPU_SYNC);
+ page = virt_to_page(phys_to_virt(phys_addr));
+ offset = phys_to_virt(phys_addr) - page_address(page);
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
offset, payload_len, RCV_FRAG_LEN);
}
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