}
/**
- * ixgbe_transform_rsc_queue - change rsc queue into a full packet
- * @skb: pointer to the last skb in the rsc queue
+ * ixgbe_merge_active_tail - merge active tail into lro skb
+ * @tail: pointer to active tail in frag_list
*
- * This function changes a queue full of hw rsc buffers into a completed
- * packet. It uses the ->prev pointers to find the first packet and then
- * turns it into the frag list owner.
+ * This function merges the length and data of an active tail into the
+ * skb containing the frag_list. It resets the tail's pointer to the head,
+ * but it leaves the heads pointer to tail intact.
**/
-static inline struct sk_buff *ixgbe_transform_rsc_queue(struct sk_buff *skb)
+static inline struct sk_buff *ixgbe_merge_active_tail(struct sk_buff *tail)
{
- unsigned int frag_list_size = 0;
- unsigned int skb_cnt = 1;
+ struct sk_buff *head = IXGBE_CB(tail)->head;
- while (skb->prev) {
- struct sk_buff *prev = skb->prev;
- frag_list_size += skb->len;
- skb->prev = NULL;
- skb = prev;
- skb_cnt++;
+ if (!head)
+ return tail;
+
+ head->len += tail->len;
+ head->data_len += tail->len;
+ head->truesize += tail->len;
+
+ IXGBE_CB(tail)->head = NULL;
+
+ return head;
+}
+
+/**
+ * ixgbe_add_active_tail - adds an active tail into the skb frag_list
+ * @head: pointer to the start of the skb
+ * @tail: pointer to active tail to add to frag_list
+ *
+ * This function adds an active tail to the end of the frag list. This tail
+ * will still be receiving data so we cannot yet ad it's stats to the main
+ * skb. That is done via ixgbe_merge_active_tail.
+ **/
+static inline void ixgbe_add_active_tail(struct sk_buff *head,
+ struct sk_buff *tail)
+{
+ struct sk_buff *old_tail = IXGBE_CB(head)->tail;
+
+ if (old_tail) {
+ ixgbe_merge_active_tail(old_tail);
+ old_tail->next = tail;
+ } else {
+ skb_shinfo(head)->frag_list = tail;
}
- skb_shinfo(skb)->frag_list = skb->next;
- skb->next = NULL;
- skb->len += frag_list_size;
- skb->data_len += frag_list_size;
- skb->truesize += frag_list_size;
- IXGBE_RSC_CB(skb)->skb_cnt = skb_cnt;
+ IXGBE_CB(tail)->head = head;
+ IXGBE_CB(head)->tail = tail;
+}
+
+/**
+ * ixgbe_close_active_frag_list - cleanup pointers on a frag_list skb
+ * @head: pointer to head of an active frag list
+ *
+ * This function will clear the frag_tail_tracker pointer on an active
+ * frag_list and returns true if the pointer was actually set
+ **/
+static inline bool ixgbe_close_active_frag_list(struct sk_buff *head)
+{
+ struct sk_buff *tail = IXGBE_CB(head)->tail;
+
+ if (!tail)
+ return false;
- return skb;
+ ixgbe_merge_active_tail(tail);
+
+ IXGBE_CB(head)->tail = NULL;
+
+ return true;
}
-static inline bool ixgbe_get_rsc_state(union ixgbe_adv_rx_desc *rx_desc)
+static void ixgbe_get_rsc_cnt(struct ixgbe_ring *rx_ring,
+ union ixgbe_adv_rx_desc *rx_desc,
+ struct sk_buff *skb)
{
- return !!(le32_to_cpu(rx_desc->wb.lower.lo_dword.data) &
- IXGBE_RXDADV_RSCCNT_MASK);
+ __le32 rsc_enabled;
+ u32 rsc_cnt;
+
+ if (!ring_is_rsc_enabled(rx_ring))
+ return;
+
+ rsc_enabled = rx_desc->wb.lower.lo_dword.data &
+ cpu_to_le32(IXGBE_RXDADV_RSCCNT_MASK);
+
+ /* If this is an RSC frame rsc_cnt should be non-zero */
+ if (!rsc_enabled)
+ return;
+
+ rsc_cnt = le32_to_cpu(rsc_enabled);
+ rsc_cnt >>= IXGBE_RXDADV_RSCCNT_SHIFT;
+
+ IXGBE_CB(skb)->append_cnt += rsc_cnt - 1;
}
static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
{
struct ixgbe_adapter *adapter = q_vector->adapter;
union ixgbe_adv_rx_desc *rx_desc, *next_rxd;
- struct ixgbe_rx_buffer *rx_buffer_info, *next_buffer;
+ struct ixgbe_rx_buffer *rx_buffer_info;
struct sk_buff *skb;
unsigned int total_rx_bytes = 0, total_rx_packets = 0;
const int current_node = numa_node_id();
u32 staterr;
u16 i;
u16 cleaned_count = 0;
- bool pkt_is_rsc = false;
i = rx_ring->next_to_clean;
rx_desc = IXGBE_RX_DESC_ADV(rx_ring, i);
rx_buffer_info->skb = NULL;
prefetch(skb->data);
- if (ring_is_rsc_enabled(rx_ring))
- pkt_is_rsc = ixgbe_get_rsc_state(rx_desc);
-
/* linear means we are building an skb from multiple pages */
if (!skb_is_nonlinear(skb)) {
u16 hlen;
- if (pkt_is_rsc &&
- !(staterr & IXGBE_RXD_STAT_EOP) &&
- !skb->prev) {
- /*
- * When HWRSC is enabled, delay unmapping
- * of the first packet. It carries the
- * header information, HW may still
- * access the header after the writeback.
- * Only unmap it when EOP is reached
- */
- IXGBE_RSC_CB(skb)->delay_unmap = true;
- IXGBE_RSC_CB(skb)->dma = rx_buffer_info->dma;
- } else {
- dma_unmap_single(rx_ring->dev,
- rx_buffer_info->dma,
- rx_ring->rx_buf_len,
- DMA_FROM_DEVICE);
- }
- rx_buffer_info->dma = 0;
-
if (ring_is_ps_enabled(rx_ring)) {
hlen = ixgbe_get_hlen(rx_desc);
upper_len = le16_to_cpu(rx_desc->wb.upper.length);
}
skb_put(skb, hlen);
+
+ /*
+ * Delay unmapping of the first packet. It carries the
+ * header information, HW may still access the header
+ * after writeback. Only unmap it when EOP is reached
+ */
+ if (!IXGBE_CB(skb)->head) {
+ IXGBE_CB(skb)->delay_unmap = true;
+ IXGBE_CB(skb)->dma = rx_buffer_info->dma;
+ } else {
+ skb = ixgbe_merge_active_tail(skb);
+ dma_unmap_single(rx_ring->dev,
+ rx_buffer_info->dma,
+ rx_ring->rx_buf_len,
+ DMA_FROM_DEVICE);
+ }
+ rx_buffer_info->dma = 0;
} else {
/* assume packet split since header is unmapped */
upper_len = le16_to_cpu(rx_desc->wb.upper.length);
skb->truesize += PAGE_SIZE / 2;
}
+ ixgbe_get_rsc_cnt(rx_ring, rx_desc, skb);
+
i++;
if (i == rx_ring->count)
i = 0;
prefetch(next_rxd);
cleaned_count++;
- if (pkt_is_rsc) {
- u32 nextp = (staterr & IXGBE_RXDADV_NEXTP_MASK) >>
- IXGBE_RXDADV_NEXTP_SHIFT;
+ if (!(staterr & IXGBE_RXD_STAT_EOP)) {
+ struct ixgbe_rx_buffer *next_buffer;
+ u32 nextp;
+
+ if (IXGBE_CB(skb)->append_cnt) {
+ nextp = staterr & IXGBE_RXDADV_NEXTP_MASK;
+ nextp >>= IXGBE_RXDADV_NEXTP_SHIFT;
+ } else {
+ nextp = i;
+ }
+
next_buffer = &rx_ring->rx_buffer_info[nextp];
- } else {
- next_buffer = &rx_ring->rx_buffer_info[i];
- }
- if (!(staterr & IXGBE_RXD_STAT_EOP)) {
if (ring_is_ps_enabled(rx_ring)) {
rx_buffer_info->skb = next_buffer->skb;
rx_buffer_info->dma = next_buffer->dma;
next_buffer->skb = skb;
next_buffer->dma = 0;
} else {
- skb->next = next_buffer->skb;
- skb->next->prev = skb;
+ struct sk_buff *next_skb = next_buffer->skb;
+ ixgbe_add_active_tail(skb, next_skb);
+ IXGBE_CB(next_skb)->head = skb;
}
rx_ring->rx_stats.non_eop_descs++;
goto next_desc;
}
- if (skb->prev) {
- skb = ixgbe_transform_rsc_queue(skb);
+ dma_unmap_single(rx_ring->dev,
+ IXGBE_CB(skb)->dma,
+ rx_ring->rx_buf_len,
+ DMA_FROM_DEVICE);
+ IXGBE_CB(skb)->dma = 0;
+ IXGBE_CB(skb)->delay_unmap = false;
+
+ if (ixgbe_close_active_frag_list(skb) &&
+ !IXGBE_CB(skb)->append_cnt) {
/* if we got here without RSC the packet is invalid */
- if (!pkt_is_rsc) {
- __pskb_trim(skb, 0);
- rx_buffer_info->skb = skb;
- goto next_desc;
- }
+ dev_kfree_skb_any(skb);
+ goto next_desc;
}
- if (ring_is_rsc_enabled(rx_ring)) {
- if (IXGBE_RSC_CB(skb)->delay_unmap) {
- dma_unmap_single(rx_ring->dev,
- IXGBE_RSC_CB(skb)->dma,
- rx_ring->rx_buf_len,
- DMA_FROM_DEVICE);
- IXGBE_RSC_CB(skb)->dma = 0;
- IXGBE_RSC_CB(skb)->delay_unmap = false;
- }
- }
- if (pkt_is_rsc) {
- if (ring_is_ps_enabled(rx_ring))
- rx_ring->rx_stats.rsc_count +=
- skb_shinfo(skb)->nr_frags;
- else
- rx_ring->rx_stats.rsc_count +=
- IXGBE_RSC_CB(skb)->skb_cnt;
+ if (IXGBE_CB(skb)->append_cnt) {
+ rx_ring->rx_stats.rsc_count +=
+ IXGBE_CB(skb)->append_cnt;
rx_ring->rx_stats.rsc_flush++;
}
if (rx_buffer_info->skb) {
struct sk_buff *skb = rx_buffer_info->skb;
rx_buffer_info->skb = NULL;
- do {
- struct sk_buff *this = skb;
- if (IXGBE_RSC_CB(this)->delay_unmap) {
- dma_unmap_single(dev,
- IXGBE_RSC_CB(this)->dma,
- rx_ring->rx_buf_len,
- DMA_FROM_DEVICE);
- IXGBE_RSC_CB(this)->dma = 0;
- IXGBE_RSC_CB(skb)->delay_unmap = false;
- }
- skb = skb->prev;
- dev_kfree_skb(this);
- } while (skb);
+ /* We need to clean up RSC frag lists */
+ skb = ixgbe_merge_active_tail(skb);
+ ixgbe_close_active_frag_list(skb);
+ if (IXGBE_CB(skb)->delay_unmap) {
+ dma_unmap_single(dev,
+ IXGBE_CB(skb)->dma,
+ rx_ring->rx_buf_len,
+ DMA_FROM_DEVICE);
+ IXGBE_CB(skb)->dma = 0;
+ IXGBE_CB(skb)->delay_unmap = false;
+ }
+ dev_kfree_skb(skb);
}
if (!rx_buffer_info->page)
continue;
projects / platform / kernel / linux-rpi.git / commitdiff