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gve: Implement packet continuation for RX. 

This enables the driver to receive RX packets spread across multiple
buffers:

For a given multi-fragment packet the "packet continuation" bit is set
on all descriptors except the last one. These descriptors' payloads are
combined into a single SKB before the SKB is handed to the
networking stack.

This change adds a "packet buffer size" notion for RX queues. The
CreateRxQueue AdminQueue command sent to the device now includes the
packet_buffer_size.

We opt for a packet_buffer_size of PAGE_SIZE / 2 to give the
driver the opportunity to flip pages where we can instead of copying.

Signed-off-by: David Awogbemila <awogbemila@google.com>
Signed-off-by: Jeroen de Borst <jeroendb@google.com>
Reviewed-by: Catherine Sullivan <csully@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Awogbemila 2021-10-24 11:42:37 -07:00 committed by David S. Miller
parent 1344e751e9
commit 37149e9374
9 changed files with 291 additions and 125 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/ethernet/google/gve/gve.h
View File

@ -149,6 +149,10 @@ struct gve_rx_ctx {
/* head and tail of skb chain for the current packet or NULL if none */
struct sk_buff *skb_head;
struct sk_buff *skb_tail;
u16 total_expected_size;
u8 expected_frag_cnt;
u8 curr_frag_cnt;
u8 reuse_frags;
};
/* Contains datapath state used to represent an RX queue. */
@ -162,6 +166,7 @@ struct gve_rx_ring {
/* threshold for posting new buffs and descs */
u32 db_threshold;
u16 packet_buffer_size;
};
/* DQO fields. */
@ -209,6 +214,9 @@ struct gve_rx_ring {
u64 rx_skb_alloc_fail; /* free-running count of skb alloc fails */
u64 rx_buf_alloc_fail; /* free-running count of buffer alloc fails */
u64 rx_desc_err_dropped_pkt; /* free-running count of packets dropped by descriptor error */
u64 rx_cont_packet_cnt; /* free-running multi-fragment packets received */
u64 rx_frag_flip_cnt; /* free-running count of rx segments where page_flip was used */
u64 rx_frag_copy_cnt; /* free-running count of rx segments copied into skb linear portion */
u32 q_num; /* queue index */
u32 ntfy_id; /* notification block index */
struct gve_queue_resources *q_resources; /* head and tail pointer idx */

1
drivers/net/ethernet/google/gve/gve_adminq.c
View File

@ -530,6 +530,7 @@ static int gve_adminq_create_rx_queue(struct gve_priv *priv, u32 queue_index)
cpu_to_be64(rx->data.data_bus),
cmd.create_rx_queue.index = cpu_to_be32(queue_index);
cmd.create_rx_queue.queue_page_list_id = cpu_to_be32(qpl_id);
cmd.create_rx_queue.packet_buffer_size = cpu_to_be16(rx->packet_buffer_size);
} else {
cmd.create_rx_queue.rx_ring_size =
cpu_to_be16(priv->rx_desc_cnt);

13
drivers/net/ethernet/google/gve/gve_desc.h
View File

@ -90,12 +90,13 @@ union gve_rx_data_slot {
/* GVE Recive Packet Descriptor Flags */
#define GVE_RXFLG(x) cpu_to_be16(1 << (3 + (x)))
#define GVE_RXF_FRAG GVE_RXFLG(3) /* IP Fragment */
#define GVE_RXF_IPV4 GVE_RXFLG(4) /* IPv4 */
#define GVE_RXF_IPV6 GVE_RXFLG(5) /* IPv6 */
#define GVE_RXF_TCP GVE_RXFLG(6) /* TCP Packet */
#define GVE_RXF_UDP GVE_RXFLG(7) /* UDP Packet */
#define GVE_RXF_ERR GVE_RXFLG(8) /* Packet Error Detected */
#define GVE_RXF_FRAG GVE_RXFLG(3) /* IP Fragment */
#define GVE_RXF_IPV4 GVE_RXFLG(4) /* IPv4 */
#define GVE_RXF_IPV6 GVE_RXFLG(5) /* IPv6 */
#define GVE_RXF_TCP GVE_RXFLG(6) /* TCP Packet */
#define GVE_RXF_UDP GVE_RXFLG(7) /* UDP Packet */
#define GVE_RXF_ERR GVE_RXFLG(8) /* Packet Error Detected */
#define GVE_RXF_PKT_CONT GVE_RXFLG(10) /* Multi Fragment RX packet */
/* GVE IRQ */
#define GVE_IRQ_ACK BIT(31)

4
drivers/net/ethernet/google/gve/gve_ethtool.c
View File

@ -43,6 +43,7 @@ static const char gve_gstrings_main_stats[][ETH_GSTRING_LEN] = {
static const char gve_gstrings_rx_stats[][ETH_GSTRING_LEN] = {
"rx_posted_desc[%u]", "rx_completed_desc[%u]", "rx_bytes[%u]",
"rx_cont_packet_cnt[%u]", "rx_frag_flip_cnt[%u]", "rx_frag_copy_cnt[%u]",
"rx_dropped_pkt[%u]", "rx_copybreak_pkt[%u]", "rx_copied_pkt[%u]",
"rx_queue_drop_cnt[%u]", "rx_no_buffers_posted[%u]",
"rx_drops_packet_over_mru[%u]", "rx_drops_invalid_checksum[%u]",
@ -265,6 +266,9 @@ gve_get_ethtool_stats(struct net_device *netdev,
} while (u64_stats_fetch_retry(&priv->rx[ring].statss,
start));
data[i++] = tmp_rx_bytes;
data[i++] = rx->rx_cont_packet_cnt;
data[i++] = rx->rx_frag_flip_cnt;
data[i++] = rx->rx_frag_copy_cnt;
/* rx dropped packets */
data[i++] = tmp_rx_skb_alloc_fail +
tmp_rx_buf_alloc_fail +

8
drivers/net/ethernet/google/gve/gve_main.c
View File

@ -1371,14 +1371,6 @@ static int gve_init_priv(struct gve_priv *priv, bool skip_describe_device)
"Could not get device information: err=%d\n", err);
goto err;
}
if (gve_is_gqi(priv) && priv->dev->max_mtu > PAGE_SIZE) {
priv->dev->max_mtu = PAGE_SIZE;
err = gve_adminq_set_mtu(priv, priv->dev->mtu);
if (err) {
dev_err(&priv->pdev->dev, "Could not set mtu");
goto err;
}
}
priv->dev->mtu = priv->dev->max_mtu;
num_ntfy = pci_msix_vec_count(priv->pdev);
if (num_ntfy <= 0) {

349
drivers/net/ethernet/google/gve/gve_rx.c
View File

@ -143,6 +143,16 @@ alloc_err:
return err;
}
static void gve_rx_ctx_clear(struct gve_rx_ctx *ctx)
{
ctx->curr_frag_cnt = 0;
ctx->total_expected_size = 0;
ctx->expected_frag_cnt = 0;
ctx->skb_head = NULL;
ctx->skb_tail = NULL;
ctx->reuse_frags = false;
}
static int gve_rx_alloc_ring(struct gve_priv *priv, int idx)
{
struct gve_rx_ring *rx = &priv->rx[idx];
@ -209,6 +219,12 @@ static int gve_rx_alloc_ring(struct gve_priv *priv, int idx)
rx->cnt = 0;
rx->db_threshold = priv->rx_desc_cnt / 2;
rx->desc.seqno = 1;
/* Allocating half-page buffers allows page-flipping which is faster
* than copying or allocating new pages.
*/
rx->packet_buffer_size = PAGE_SIZE / 2;
gve_rx_ctx_clear(&rx->ctx);
gve_rx_add_to_block(priv, idx);
return 0;
@ -275,18 +291,28 @@ static enum pkt_hash_types gve_rss_type(__be16 pkt_flags)
return PKT_HASH_TYPE_L2;
}
static u16 gve_rx_ctx_padding(struct gve_rx_ctx *ctx)
{
return (ctx->curr_frag_cnt == 0) ? GVE_RX_PAD : 0;
}
static struct sk_buff *gve_rx_add_frags(struct napi_struct *napi,
struct gve_rx_slot_page_info *page_info,
u16 len)
u16 packet_buffer_size, u16 len,
struct gve_rx_ctx *ctx)
{
struct sk_buff *skb = napi_get_frags(napi);
u32 offset = page_info->page_offset + gve_rx_ctx_padding(ctx);
struct sk_buff *skb;
if (unlikely(!skb))
if (!ctx->skb_head)
ctx->skb_head = napi_get_frags(napi);
if (unlikely(!ctx->skb_head))
return NULL;
skb_add_rx_frag(skb, 0, page_info->page,
page_info->page_offset +
GVE_RX_PAD, len, PAGE_SIZE / 2);
skb = ctx->skb_head;
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page_info->page,
offset, len, packet_buffer_size);
return skb;
}
@ -300,12 +326,6 @@ static void gve_rx_flip_buff(struct gve_rx_slot_page_info *page_info, __be64 *sl
*(slot_addr) ^= offset;
}
static bool gve_rx_can_flip_buffers(struct net_device *netdev)
{
return PAGE_SIZE >= 4096
? netdev->mtu + GVE_RX_PAD + ETH_HLEN <= PAGE_SIZE / 2 : false;
}
static int gve_rx_can_recycle_buffer(struct gve_rx_slot_page_info *page_info)
{
int pagecount = page_count(page_info->page);
@ -325,11 +345,11 @@ static struct sk_buff *
gve_rx_raw_addressing(struct device *dev, struct net_device *netdev,
struct gve_rx_slot_page_info *page_info, u16 len,
struct napi_struct *napi,
union gve_rx_data_slot *data_slot)
union gve_rx_data_slot *data_slot,
u16 packet_buffer_size, struct gve_rx_ctx *ctx)
{
struct sk_buff *skb;
struct sk_buff *skb = gve_rx_add_frags(napi, page_info, packet_buffer_size, len, ctx);
skb = gve_rx_add_frags(napi, page_info, len);
if (!skb)
return NULL;
@ -348,6 +368,7 @@ gve_rx_qpl(struct device *dev, struct net_device *netdev,
u16 len, struct napi_struct *napi,
union gve_rx_data_slot *data_slot)
{
struct gve_rx_ctx *ctx = &rx->ctx;
struct sk_buff *skb;
/* if raw_addressing mode is not enabled gvnic can only receive into
@ -355,8 +376,8 @@ gve_rx_qpl(struct device *dev, struct net_device *netdev,
* choice is to copy the data out of it so that we can return it to the
* device.
*/
if (page_info->can_flip) {
skb = gve_rx_add_frags(napi, page_info, len);
if (ctx->reuse_frags) {
skb = gve_rx_add_frags(napi, page_info, rx->packet_buffer_size, len, ctx);
/* No point in recycling if we didn't get the skb */
if (skb) {
/* Make sure that the page isn't freed. */
@ -364,114 +385,247 @@ gve_rx_qpl(struct device *dev, struct net_device *netdev,
gve_rx_flip_buff(page_info, &data_slot->qpl_offset);
}
} else {
skb = gve_rx_copy(netdev, napi, page_info, len, GVE_RX_PAD);
const u16 padding = gve_rx_ctx_padding(ctx);
skb = gve_rx_copy(netdev, napi, page_info, len, padding, ctx);
if (skb) {
u64_stats_update_begin(&rx->statss);
rx->rx_copied_pkt++;
rx->rx_frag_copy_cnt++;
u64_stats_update_end(&rx->statss);
}
}
return skb;
}
static bool gve_rx(struct gve_rx_ring *rx, struct gve_rx_desc *rx_desc,
netdev_features_t feat, u32 idx)
#define GVE_PKTCONT_BIT_IS_SET(x) (GVE_RXF_PKT_CONT & (x))
static u16 gve_rx_get_fragment_size(struct gve_rx_ctx *ctx, struct gve_rx_desc *desc)
{
return be16_to_cpu(desc->len) - gve_rx_ctx_padding(ctx);
}
static bool gve_rx_ctx_init(struct gve_rx_ctx *ctx, struct gve_rx_ring *rx)
{
bool qpl_mode = !rx->data.raw_addressing, packet_size_error = false;
bool buffer_error = false, desc_error = false, seqno_error = false;
struct gve_rx_slot_page_info *page_info;
struct gve_priv *priv = rx->gve;
struct napi_struct *napi = &priv->ntfy_blocks[rx->ntfy_id].napi;
struct net_device *dev = priv->dev;
union gve_rx_data_slot *data_slot;
struct sk_buff *skb = NULL;
dma_addr_t page_bus;
void *va;
u16 len;
u32 idx = rx->cnt & rx->mask;
bool reuse_frags, can_flip;
struct gve_rx_desc *desc;
u16 packet_size = 0;
u16 n_frags = 0;
int recycle;
/* Prefetch two packet pages ahead, we will need it soon. */
page_info = &rx->data.page_info[(idx + 2) & rx->mask];
va = page_info->page_address + GVE_RX_PAD +
page_info->page_offset;
/** In QPL mode, we only flip buffers when all buffers containing the packet
* can be flipped. RDA can_flip decisions will be made later, per frag.
*/
can_flip = qpl_mode;
reuse_frags = can_flip;
do {
u16 frag_size;
prefetch(page_info->page); /* Kernel page struct. */
prefetch(va); /* Packet header. */
prefetch(va + 64); /* Next cacheline too. */
n_frags++;
desc = &rx->desc.desc_ring[idx];
desc_error = unlikely(desc->flags_seq & GVE_RXF_ERR) || desc_error;
if (GVE_SEQNO(desc->flags_seq) != rx->desc.seqno) {
seqno_error = true;
netdev_warn(priv->dev,
"RX seqno error: want=%d, got=%d, dropping packet and scheduling reset.",
rx->desc.seqno, GVE_SEQNO(desc->flags_seq));
}
frag_size = be16_to_cpu(desc->len);
packet_size += frag_size;
if (frag_size > rx->packet_buffer_size) {
packet_size_error = true;
netdev_warn(priv->dev,
"RX fragment error: packet_buffer_size=%d, frag_size=%d, droping packet.",
rx->packet_buffer_size, be16_to_cpu(desc->len));
}
page_info = &rx->data.page_info[idx];
if (can_flip) {
recycle = gve_rx_can_recycle_buffer(page_info);
reuse_frags = reuse_frags && recycle > 0;
buffer_error = buffer_error || unlikely(recycle < 0);
}
idx = (idx + 1) & rx->mask;
rx->desc.seqno = gve_next_seqno(rx->desc.seqno);
} while (GVE_PKTCONT_BIT_IS_SET(desc->flags_seq));
/* drop this packet */
if (unlikely(rx_desc->flags_seq & GVE_RXF_ERR)) {
prefetch(rx->desc.desc_ring + idx);
ctx->curr_frag_cnt = 0;
ctx->total_expected_size = packet_size - GVE_RX_PAD;
ctx->expected_frag_cnt = n_frags;
ctx->skb_head = NULL;
ctx->reuse_frags = reuse_frags;
if (ctx->expected_frag_cnt > 1) {
u64_stats_update_begin(&rx->statss);
rx->rx_cont_packet_cnt++;
u64_stats_update_end(&rx->statss);
}
if (ctx->total_expected_size > priv->rx_copybreak && !ctx->reuse_frags && qpl_mode) {
u64_stats_update_begin(&rx->statss);
rx->rx_copied_pkt++;
u64_stats_update_end(&rx->statss);
}
if (unlikely(buffer_error || seqno_error || packet_size_error)) {
gve_schedule_reset(priv);
return false;
}
if (unlikely(desc_error)) {
u64_stats_update_begin(&rx->statss);
rx->rx_desc_err_dropped_pkt++;
u64_stats_update_end(&rx->statss);
return false;
}
return true;
}
len = be16_to_cpu(rx_desc->len) - GVE_RX_PAD;
page_info = &rx->data.page_info[idx];
static struct sk_buff *gve_rx_skb(struct gve_priv *priv, struct gve_rx_ring *rx,
struct gve_rx_slot_page_info *page_info, struct napi_struct *napi,
u16 len, union gve_rx_data_slot *data_slot)
{
struct net_device *netdev = priv->dev;
struct gve_rx_ctx *ctx = &rx->ctx;
struct sk_buff *skb = NULL;
data_slot = &rx->data.data_ring[idx];
page_bus = (rx->data.raw_addressing) ?
be64_to_cpu(data_slot->addr) & GVE_DATA_SLOT_ADDR_PAGE_MASK :
rx->data.qpl->page_buses[idx];
dma_sync_single_for_cpu(&priv->pdev->dev, page_bus,
PAGE_SIZE, DMA_FROM_DEVICE);
if (len <= priv->rx_copybreak) {
if (len <= priv->rx_copybreak && ctx->expected_frag_cnt == 1) {
/* Just copy small packets */
skb = gve_rx_copy(dev, napi, page_info, len, GVE_RX_PAD);
u64_stats_update_begin(&rx->statss);
rx->rx_copied_pkt++;
rx->rx_copybreak_pkt++;
u64_stats_update_end(&rx->statss);
skb = gve_rx_copy(netdev, napi, page_info, len, GVE_RX_PAD, ctx);
if (skb) {
u64_stats_update_begin(&rx->statss);
rx->rx_copied_pkt++;
rx->rx_frag_copy_cnt++;
rx->rx_copybreak_pkt++;
} u64_stats_update_end(&rx->statss);
} else {
u8 can_flip = gve_rx_can_flip_buffers(dev);
int recycle = 0;
if (can_flip) {
recycle = gve_rx_can_recycle_buffer(page_info);
if (recycle < 0) {
if (!rx->data.raw_addressing)
gve_schedule_reset(priv);
return false;
}
}
page_info->can_flip = can_flip && recycle;
if (rx->data.raw_addressing) {
skb = gve_rx_raw_addressing(&priv->pdev->dev, dev,
int recycle = gve_rx_can_recycle_buffer(page_info);
if (unlikely(recycle < 0)) {
gve_schedule_reset(priv);
return NULL;
}
page_info->can_flip = recycle;
if (page_info->can_flip) {
u64_stats_update_begin(&rx->statss);
rx->rx_frag_flip_cnt++;
u64_stats_update_end(&rx->statss);
}
skb = gve_rx_raw_addressing(&priv->pdev->dev, netdev,
page_info, len, napi,
data_slot);
data_slot,
rx->packet_buffer_size, ctx);
} else {
skb = gve_rx_qpl(&priv->pdev->dev, dev, rx,
if (ctx->reuse_frags) {
u64_stats_update_begin(&rx->statss);
rx->rx_frag_flip_cnt++;
u64_stats_update_end(&rx->statss);
}
skb = gve_rx_qpl(&priv->pdev->dev, netdev, rx,
page_info, len, napi, data_slot);
}
}
return skb;
}
if (!skb) {
u64_stats_update_begin(&rx->statss);
rx->rx_skb_alloc_fail++;
u64_stats_update_end(&rx->statss);
return false;
static bool gve_rx(struct gve_rx_ring *rx, netdev_features_t feat,
u64 *packet_size_bytes, u32 *work_done)
{
struct gve_rx_slot_page_info *page_info;
struct gve_rx_ctx *ctx = &rx->ctx;
union gve_rx_data_slot *data_slot;
struct gve_priv *priv = rx->gve;
struct gve_rx_desc *first_desc;
struct sk_buff *skb = NULL;
struct gve_rx_desc *desc;
struct napi_struct *napi;
dma_addr_t page_bus;
u32 work_cnt = 0;
void *va;
u32 idx;
u16 len;
idx = rx->cnt & rx->mask;
first_desc = &rx->desc.desc_ring[idx];
desc = first_desc;
napi = &priv->ntfy_blocks[rx->ntfy_id].napi;
if (unlikely(!gve_rx_ctx_init(ctx, rx)))
goto skb_alloc_fail;
while (ctx->curr_frag_cnt < ctx->expected_frag_cnt) {
/* Prefetch two packet buffers ahead, we will need it soon. */
page_info = &rx->data.page_info[(idx + 2) & rx->mask];
va = page_info->page_address + page_info->page_offset;
prefetch(page_info->page); /* Kernel page struct. */
prefetch(va); /* Packet header. */
prefetch(va + 64); /* Next cacheline too. */
len = gve_rx_get_fragment_size(ctx, desc);
page_info = &rx->data.page_info[idx];
data_slot = &rx->data.data_ring[idx];
page_bus = rx->data.raw_addressing ?
be64_to_cpu(data_slot->addr) - page_info->page_offset :
rx->data.qpl->page_buses[idx];
dma_sync_single_for_cpu(&priv->pdev->dev, page_bus, PAGE_SIZE, DMA_FROM_DEVICE);
skb = gve_rx_skb(priv, rx, page_info, napi, len, data_slot);
if (!skb) {
u64_stats_update_begin(&rx->statss);
rx->rx_skb_alloc_fail++;
u64_stats_update_end(&rx->statss);
goto skb_alloc_fail;
}
ctx->curr_frag_cnt++;
rx->cnt++;
idx = rx->cnt & rx->mask;
work_cnt++;
desc = &rx->desc.desc_ring[idx];
}
if (likely(feat & NETIF_F_RXCSUM)) {
/* NIC passes up the partial sum */
if (rx_desc->csum)
if (first_desc->csum)
skb->ip_summed = CHECKSUM_COMPLETE;
else
skb->ip_summed = CHECKSUM_NONE;
skb->csum = csum_unfold(rx_desc->csum);
skb->csum = csum_unfold(first_desc->csum);
}
/* parse flags & pass relevant info up */
if (likely(feat & NETIF_F_RXHASH) &&
gve_needs_rss(rx_desc->flags_seq))
skb_set_hash(skb, be32_to_cpu(rx_desc->rss_hash),
gve_rss_type(rx_desc->flags_seq));
gve_needs_rss(first_desc->flags_seq))
skb_set_hash(skb, be32_to_cpu(first_desc->rss_hash),
gve_rss_type(first_desc->flags_seq));
*packet_size_bytes = skb->len + (skb->protocol ? ETH_HLEN : 0);
*work_done = work_cnt;
if (skb_is_nonlinear(skb))
napi_gro_frags(napi);
else
napi_gro_receive(napi, skb);
gve_rx_ctx_clear(ctx);
return true;
skb_alloc_fail:
if (napi->skb)
napi_free_frags(napi);
*packet_size_bytes = 0;
*work_done = ctx->expected_frag_cnt;
while (ctx->curr_frag_cnt < ctx->expected_frag_cnt) {
rx->cnt++;
ctx->curr_frag_cnt++;
}
gve_rx_ctx_clear(ctx);
return false;
}
bool gve_rx_work_pending(struct gve_rx_ring *rx)
@ -529,7 +683,6 @@ static bool gve_rx_refill_buffers(struct gve_priv *priv, struct gve_rx_ring *rx)
union gve_rx_data_slot *data_slot =
&rx->data.data_ring[idx];
struct device *dev = &priv->pdev->dev;
gve_rx_free_buffer(dev, page_info, data_slot);
page_info->page = NULL;
if (gve_rx_alloc_buffer(priv, dev, page_info,
@ -550,16 +703,17 @@ static bool gve_rx_refill_buffers(struct gve_priv *priv, struct gve_rx_ring *rx)
static int gve_clean_rx_done(struct gve_rx_ring *rx, int budget,
netdev_features_t feat)
{
u32 work_done = 0, total_packet_cnt = 0, ok_packet_cnt = 0;
struct gve_priv *priv = rx->gve;
u32 work_done = 0, packets = 0;
u32 idx = rx->cnt & rx->mask;
struct gve_rx_desc *desc;
u32 cnt = rx->cnt;
u32 idx = cnt & rx->mask;
u64 bytes = 0;
desc = rx->desc.desc_ring + idx;
desc = &rx->desc.desc_ring[idx];
while ((GVE_SEQNO(desc->flags_seq) == rx->desc.seqno) &&
work_done < budget) {
u64 packet_size_bytes = 0;
u32 work_cnt = 0;
bool dropped;
netif_info(priv, rx_status, priv->dev,
@ -570,37 +724,32 @@ static int gve_clean_rx_done(struct gve_rx_ring *rx, int budget,
rx->q_num, GVE_SEQNO(desc->flags_seq),
rx->desc.seqno);
/* prefetch two descriptors ahead */
prefetch(rx->desc.desc_ring + ((cnt + 2) & rx->mask));
dropped = !gve_rx(rx, desc, feat, idx);
dropped = !gve_rx(rx, feat, &packet_size_bytes, &work_cnt);
if (!dropped) {
bytes += be16_to_cpu(desc->len) - GVE_RX_PAD;
packets++;
bytes += packet_size_bytes;
ok_packet_cnt++;
}
cnt++;
idx = cnt & rx->mask;
desc = rx->desc.desc_ring + idx;
rx->desc.seqno = gve_next_seqno(rx->desc.seqno);
work_done++;
total_packet_cnt++;
idx = rx->cnt & rx->mask;
desc = &rx->desc.desc_ring[idx];
work_done += work_cnt;
}
if (!work_done && rx->fill_cnt - cnt > rx->db_threshold)
if (!work_done && rx->fill_cnt - rx->cnt > rx->db_threshold)
return 0;
if (work_done) {
u64_stats_update_begin(&rx->statss);
rx->rpackets += packets;
rx->rpackets += ok_packet_cnt;
rx->rbytes += bytes;
u64_stats_update_end(&rx->statss);
rx->cnt = cnt;
}
/* restock ring slots */
if (!rx->data.raw_addressing) {
/* In QPL mode buffs are refilled as the desc are processed */
rx->fill_cnt += work_done;
} else if (rx->fill_cnt - cnt <= rx->db_threshold) {
} else if (rx->fill_cnt - rx->cnt <= rx->db_threshold) {
/* In raw addressing mode buffs are only refilled if the avail
* falls below a threshold.
*/
@ -610,14 +759,14 @@ static int gve_clean_rx_done(struct gve_rx_ring *rx, int budget,
/* If we were not able to completely refill buffers, we'll want
* to schedule this queue for work again to refill buffers.
*/
if (rx->fill_cnt - cnt <= rx->db_threshold) {
if (rx->fill_cnt - rx->cnt <= rx->db_threshold) {
gve_rx_write_doorbell(priv, rx);
return budget;
}
}
gve_rx_write_doorbell(priv, rx);
return work_done;
return total_packet_cnt;
}
int gve_rx_poll(struct gve_notify_block *block, int budget)

2
drivers/net/ethernet/google/gve/gve_rx_dqo.c
View File

@ -568,7 +568,7 @@ static int gve_rx_dqo(struct napi_struct *napi, struct gve_rx_ring *rx,
if (eop && buf_len <= priv->rx_copybreak) {
rx->ctx.skb_head = gve_rx_copy(priv->dev, napi,
&buf_state->page_info, buf_len, 0);
&buf_state->page_info, buf_len, 0, NULL);
if (unlikely(!rx->ctx.skb_head))
goto error;
rx->ctx.skb_tail = rx->ctx.skb_head;

29
drivers/net/ethernet/google/gve/gve_utils.c
View File

@ -50,20 +50,31 @@ void gve_rx_add_to_block(struct gve_priv *priv, int queue_idx)
struct sk_buff *gve_rx_copy(struct net_device *dev, struct napi_struct *napi,
struct gve_rx_slot_page_info *page_info, u16 len,
u16 pad)
u16 padding, struct gve_rx_ctx *ctx)
{
struct sk_buff *skb = napi_alloc_skb(napi, len);
void *va = page_info->page_address + pad +
page_info->page_offset;
void *va = page_info->page_address + padding + page_info->page_offset;
int skb_linear_offset = 0;
bool set_protocol = false;
struct sk_buff *skb;
if (unlikely(!skb))
return NULL;
if (ctx) {
if (!ctx->skb_head)
ctx->skb_head = napi_alloc_skb(napi, ctx->total_expected_size);
if (unlikely(!ctx->skb_head))
return NULL;
skb = ctx->skb_head;
skb_linear_offset = skb->len;
set_protocol = ctx->curr_frag_cnt == ctx->expected_frag_cnt - 1;
} else {
skb = napi_alloc_skb(napi, len);
set_protocol = true;
}
__skb_put(skb, len);
skb_copy_to_linear_data_offset(skb, skb_linear_offset, va, len);
skb_copy_to_linear_data(skb, va, len);
skb->protocol = eth_type_trans(skb, dev);
if (set_protocol)
skb->protocol = eth_type_trans(skb, dev);
return skb;
}

2
drivers/net/ethernet/google/gve/gve_utils.h
View File

@ -19,7 +19,7 @@ void gve_rx_add_to_block(struct gve_priv *priv, int queue_idx);
struct sk_buff *gve_rx_copy(struct net_device *dev, struct napi_struct *napi,
struct gve_rx_slot_page_info *page_info, u16 len,
u16 pad);
u16 pad, struct gve_rx_ctx *ctx);
/* Decrement pagecnt_bias. Set it back to INT_MAX if it reached zero. */
void gve_dec_pagecnt_bias(struct gve_rx_slot_page_info *page_info);