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authorJulian Wiedmann <jwi@linux.ibm.com>2020-03-25 10:34:57 +0100
committerDavid S. Miller <davem@davemloft.net>2020-03-25 12:07:15 -0700
commited13615dd32690ca2a9d1f730a596f950eafd905 (patch)
treebd42e8da429767c02521eefd0abb61fdcc175787
parent29f3490ba9d2399d3d1b20c4aa74592d92bd4e11 (diff)
s390/qeth: simplify RX buffer tracking
Since RX buffers may contain multiple packets, qeth's NAPI poll code can exhaust its budget in the middle of an RX buffer. Thus we keep track of our current position within the active RX buffer, so we can resume processing here in the next NAPI poll period. Clean up that code by tracking the index of the active buffer element, instead of a pointer to it. Also simplify the code that advances to the next RX buffer when the current buffer has been fully processed. v2: - remove QDIO_ELEMENT_NO() macro (davem) Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/s390/net/qeth_core.h2
-rw-r--r--drivers/s390/net/qeth_core_main.c30
2 files changed, 13 insertions, 19 deletions
diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 6eb431c194bd..9840d4fab010 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -752,7 +752,7 @@ enum qeth_addr_disposition {
struct qeth_rx {
int b_count;
int b_index;
- struct qdio_buffer_element *b_element;
+ u8 buf_element;
int e_offset;
int qdio_err;
};
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index bd3adbb6ad50..4f33e4ee49d7 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -5332,14 +5332,13 @@ static inline int qeth_is_last_sbale(struct qdio_buffer_element *sbale)
}
static int qeth_extract_skb(struct qeth_card *card,
- struct qeth_qdio_buffer *qethbuffer,
- struct qdio_buffer_element **__element,
+ struct qeth_qdio_buffer *qethbuffer, u8 *element_no,
int *__offset)
{
- struct qdio_buffer_element *element = *__element;
struct qeth_priv *priv = netdev_priv(card->dev);
struct qdio_buffer *buffer = qethbuffer->buffer;
struct napi_struct *napi = &card->napi;
+ struct qdio_buffer_element *element;
unsigned int linear_len = 0;
bool uses_frags = false;
int offset = *__offset;
@@ -5349,6 +5348,8 @@ static int qeth_extract_skb(struct qeth_card *card,
struct sk_buff *skb;
int skb_len = 0;
+ element = &buffer->element[*element_no];
+
next_packet:
/* qeth_hdr must not cross element boundaries */
while (element->length < offset + sizeof(struct qeth_hdr)) {
@@ -5504,7 +5505,7 @@ walk_packet:
if (!skb)
goto next_packet;
- *__element = element;
+ *element_no = element - &buffer->element[0];
*__offset = offset;
qeth_receive_skb(card, skb, hdr, uses_frags);
@@ -5519,7 +5520,7 @@ static int qeth_extract_skbs(struct qeth_card *card, int budget,
*done = false;
while (budget) {
- if (qeth_extract_skb(card, buf, &card->rx.b_element,
+ if (qeth_extract_skb(card, buf, &card->rx.buf_element,
&card->rx.e_offset)) {
*done = true;
break;
@@ -5550,10 +5551,6 @@ int qeth_poll(struct napi_struct *napi, int budget)
card->rx.b_count = 0;
break;
}
- card->rx.b_element =
- &card->qdio.in_q->bufs[card->rx.b_index]
- .buffer->element[0];
- card->rx.e_offset = 0;
}
while (card->rx.b_count) {
@@ -5572,15 +5569,12 @@ int qeth_poll(struct napi_struct *napi, int budget)
buffer->pool_entry);
qeth_queue_input_buffer(card, card->rx.b_index);
card->rx.b_count--;
- if (card->rx.b_count) {
- card->rx.b_index =
- QDIO_BUFNR(card->rx.b_index + 1);
- card->rx.b_element =
- &card->qdio.in_q
- ->bufs[card->rx.b_index]
- .buffer->element[0];
- card->rx.e_offset = 0;
- }
+
+ /* Step forward to next buffer: */
+ card->rx.b_index =
+ QDIO_BUFNR(card->rx.b_index + 1);
+ card->rx.buf_element = 0;
+ card->rx.e_offset = 0;
}
if (work_done >= budget)