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Message-Id: <20211024184238.409589-2-jeroendb@google.com>
Date: Sun, 24 Oct 2021 11:42:36 -0700
From: Jeroen de Borst <jeroendb@...gle.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org,
David Awogbemila <awogbemila@...gle.com>,
Jeroen de Borst <jeroendb@...gle.com>,
Catherine Sullivan <csully@...gle.com>
Subject: [PATCH net-next 1/3] gve: Add RX context.
From: David Awogbemila <awogbemila@...gle.com>
This refactor moves the skb_head and skb_tail fields into a new
gve_rx_ctx struct. This new struct will contain information about the
current packet being processed. This is in preparation for
multi-descriptor RX packets.
Signed-off-by: David Awogbemila <awogbemila@...gle.com>
Signed-off-by: Jeroen de Borst <jeroendb@...gle.com>
Reviewed-by: Catherine Sullivan <csully@...gle.com>
---
drivers/net/ethernet/google/gve/gve.h | 13 +++-
drivers/net/ethernet/google/gve/gve_rx_dqo.c | 68 ++++++++++----------
2 files changed, 44 insertions(+), 37 deletions(-)
diff --git a/drivers/net/ethernet/google/gve/gve.h b/drivers/net/ethernet/google/gve/gve.h
index 51ed8fe71d2d..03ef8e039065 100644
--- a/drivers/net/ethernet/google/gve/gve.h
+++ b/drivers/net/ethernet/google/gve/gve.h
@@ -142,6 +142,15 @@ struct gve_index_list {
s16 tail;
};
+/* A single received packet split across multiple buffers may be
+ * reconstructed using the information in this structure.
+ */
+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;
+};
+
/* Contains datapath state used to represent an RX queue. */
struct gve_rx_ring {
struct gve_priv *gve;
@@ -206,9 +215,7 @@ struct gve_rx_ring {
dma_addr_t q_resources_bus; /* dma address for the queue resources */
struct u64_stats_sync statss; /* sync stats for 32bit archs */
- /* head and tail of skb chain for the current packet or NULL if none */
- struct sk_buff *skb_head;
- struct sk_buff *skb_tail;
+ struct gve_rx_ctx ctx; /* Info for packet currently being processed in this ring. */
};
/* A TX desc ring entry */
diff --git a/drivers/net/ethernet/google/gve/gve_rx_dqo.c b/drivers/net/ethernet/google/gve/gve_rx_dqo.c
index 8500621b2cd4..9765c92a5c29 100644
--- a/drivers/net/ethernet/google/gve/gve_rx_dqo.c
+++ b/drivers/net/ethernet/google/gve/gve_rx_dqo.c
@@ -240,8 +240,8 @@ static int gve_rx_alloc_ring_dqo(struct gve_priv *priv, int idx)
rx->dqo.bufq.mask = buffer_queue_slots - 1;
rx->dqo.complq.num_free_slots = completion_queue_slots;
rx->dqo.complq.mask = completion_queue_slots - 1;
- rx->skb_head = NULL;
- rx->skb_tail = NULL;
+ rx->ctx.skb_head = NULL;
+ rx->ctx.skb_tail = NULL;
rx->dqo.num_buf_states = min_t(s16, S16_MAX, buffer_queue_slots * 4);
rx->dqo.buf_states = kvcalloc(rx->dqo.num_buf_states,
@@ -467,12 +467,12 @@ static void gve_rx_skb_hash(struct sk_buff *skb,
static void gve_rx_free_skb(struct gve_rx_ring *rx)
{
- if (!rx->skb_head)
+ if (!rx->ctx.skb_head)
return;
- dev_kfree_skb_any(rx->skb_head);
- rx->skb_head = NULL;
- rx->skb_tail = NULL;
+ dev_kfree_skb_any(rx->ctx.skb_head);
+ rx->ctx.skb_head = NULL;
+ rx->ctx.skb_tail = NULL;
}
/* Chains multi skbs for single rx packet.
@@ -483,7 +483,7 @@ static int gve_rx_append_frags(struct napi_struct *napi,
u16 buf_len, struct gve_rx_ring *rx,
struct gve_priv *priv)
{
- int num_frags = skb_shinfo(rx->skb_tail)->nr_frags;
+ int num_frags = skb_shinfo(rx->ctx.skb_tail)->nr_frags;
if (unlikely(num_frags == MAX_SKB_FRAGS)) {
struct sk_buff *skb;
@@ -492,17 +492,17 @@ static int gve_rx_append_frags(struct napi_struct *napi,
if (!skb)
return -1;
- skb_shinfo(rx->skb_tail)->frag_list = skb;
- rx->skb_tail = skb;
+ skb_shinfo(rx->ctx.skb_tail)->frag_list = skb;
+ rx->ctx.skb_tail = skb;
num_frags = 0;
}
- if (rx->skb_tail != rx->skb_head) {
- rx->skb_head->len += buf_len;
- rx->skb_head->data_len += buf_len;
- rx->skb_head->truesize += priv->data_buffer_size_dqo;
+ if (rx->ctx.skb_tail != rx->ctx.skb_head) {
+ rx->ctx.skb_head->len += buf_len;
+ rx->ctx.skb_head->data_len += buf_len;
+ rx->ctx.skb_head->truesize += priv->data_buffer_size_dqo;
}
- skb_add_rx_frag(rx->skb_tail, num_frags,
+ skb_add_rx_frag(rx->ctx.skb_tail, num_frags,
buf_state->page_info.page,
buf_state->page_info.page_offset,
buf_len, priv->data_buffer_size_dqo);
@@ -556,7 +556,7 @@ static int gve_rx_dqo(struct napi_struct *napi, struct gve_rx_ring *rx,
buf_len, DMA_FROM_DEVICE);
/* Append to current skb if one exists. */
- if (rx->skb_head) {
+ if (rx->ctx.skb_head) {
if (unlikely(gve_rx_append_frags(napi, buf_state, buf_len, rx,
priv)) != 0) {
goto error;
@@ -567,11 +567,11 @@ static int gve_rx_dqo(struct napi_struct *napi, struct gve_rx_ring *rx,
}
if (eop && buf_len <= priv->rx_copybreak) {
- rx->skb_head = gve_rx_copy(priv->dev, napi,
- &buf_state->page_info, buf_len, 0);
- if (unlikely(!rx->skb_head))
+ rx->ctx.skb_head = gve_rx_copy(priv->dev, napi,
+ &buf_state->page_info, buf_len, 0);
+ if (unlikely(!rx->ctx.skb_head))
goto error;
- rx->skb_tail = rx->skb_head;
+ rx->ctx.skb_tail = rx->ctx.skb_head;
u64_stats_update_begin(&rx->statss);
rx->rx_copied_pkt++;
@@ -583,12 +583,12 @@ static int gve_rx_dqo(struct napi_struct *napi, struct gve_rx_ring *rx,
return 0;
}
- rx->skb_head = napi_get_frags(napi);
- if (unlikely(!rx->skb_head))
+ rx->ctx.skb_head = napi_get_frags(napi);
+ if (unlikely(!rx->ctx.skb_head))
goto error;
- rx->skb_tail = rx->skb_head;
+ rx->ctx.skb_tail = rx->ctx.skb_head;
- skb_add_rx_frag(rx->skb_head, 0, buf_state->page_info.page,
+ skb_add_rx_frag(rx->ctx.skb_head, 0, buf_state->page_info.page,
buf_state->page_info.page_offset, buf_len,
priv->data_buffer_size_dqo);
gve_dec_pagecnt_bias(&buf_state->page_info);
@@ -635,27 +635,27 @@ static int gve_rx_complete_skb(struct gve_rx_ring *rx, struct napi_struct *napi,
rx->gve->ptype_lut_dqo->ptypes[desc->packet_type];
int err;
- skb_record_rx_queue(rx->skb_head, rx->q_num);
+ skb_record_rx_queue(rx->ctx.skb_head, rx->q_num);
if (feat & NETIF_F_RXHASH)
- gve_rx_skb_hash(rx->skb_head, desc, ptype);
+ gve_rx_skb_hash(rx->ctx.skb_head, desc, ptype);
if (feat & NETIF_F_RXCSUM)
- gve_rx_skb_csum(rx->skb_head, desc, ptype);
+ gve_rx_skb_csum(rx->ctx.skb_head, desc, ptype);
/* RSC packets must set gso_size otherwise the TCP stack will complain
* that packets are larger than MTU.
*/
if (desc->rsc) {
- err = gve_rx_complete_rsc(rx->skb_head, desc, ptype);
+ err = gve_rx_complete_rsc(rx->ctx.skb_head, desc, ptype);
if (err < 0)
return err;
}
- if (skb_headlen(rx->skb_head) == 0)
+ if (skb_headlen(rx->ctx.skb_head) == 0)
napi_gro_frags(napi);
else
- napi_gro_receive(napi, rx->skb_head);
+ napi_gro_receive(napi, rx->ctx.skb_head);
return 0;
}
@@ -717,18 +717,18 @@ int gve_rx_poll_dqo(struct gve_notify_block *block, int budget)
/* Free running counter of completed descriptors */
rx->cnt++;
- if (!rx->skb_head)
+ if (!rx->ctx.skb_head)
continue;
if (!compl_desc->end_of_packet)
continue;
work_done++;
- pkt_bytes = rx->skb_head->len;
+ pkt_bytes = rx->ctx.skb_head->len;
/* The ethernet header (first ETH_HLEN bytes) is snipped off
* by eth_type_trans.
*/
- if (skb_headlen(rx->skb_head))
+ if (skb_headlen(rx->ctx.skb_head))
pkt_bytes += ETH_HLEN;
/* gve_rx_complete_skb() will consume skb if successful */
@@ -741,8 +741,8 @@ int gve_rx_poll_dqo(struct gve_notify_block *block, int budget)
}
bytes += pkt_bytes;
- rx->skb_head = NULL;
- rx->skb_tail = NULL;
+ rx->ctx.skb_head = NULL;
+ rx->ctx.skb_tail = NULL;
}
gve_rx_post_buffers_dqo(rx);
--
2.33.0.1079.g6e70778dc9-goog
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