[ovs-dev] [PATCH v11 08/14] dp-packet: copy data from multi-seg. DPDK mbuf
Tiago Lam
tiago.lam at intel.com
Wed Oct 10 16:22:26 UTC 2018
From: Michael Qiu <qiudayu at chinac.com>
When doing packet clone, if packet source is from DPDK driver,
multi-segment must be considered, and copy the segment's data one by
one.
Also, lots of DPDK mbuf's info is missed during a copy, like packet
type, ol_flags, etc. That information is very important for DPDK to do
packets processing.
Co-authored-by: Mark Kavanagh <mark.b.kavanagh at intel.com>
Co-authored-by: Tiago Lam <tiago.lam at intel.com>
Signed-off-by: Michael Qiu <qiudayu at chinac.com>
Signed-off-by: Mark Kavanagh <mark.b.kavanagh at intel.com>
Signed-off-by: Tiago Lam <tiago.lam at intel.com>
Acked-by: Eelco Chaudron <echaudro at redhat.com>
---
lib/dp-packet.c | 57 ++++++++++++++++++++++++++++++++++++-------------------
lib/dp-packet.h | 33 ++++++++++++++++++++++++++++++++
lib/netdev-dpdk.c | 1 +
3 files changed, 72 insertions(+), 19 deletions(-)
diff --git a/lib/dp-packet.c b/lib/dp-packet.c
index 4c197b6..1b9503c 100644
--- a/lib/dp-packet.c
+++ b/lib/dp-packet.c
@@ -163,39 +163,58 @@ dp_packet_clone(const struct dp_packet *buffer)
return dp_packet_clone_with_headroom(buffer, 0);
}
+#ifdef DPDK_NETDEV
+struct dp_packet *
+dp_packet_clone_with_headroom(const struct dp_packet *b, size_t headroom) {
+ struct dp_packet *new_buffer;
+ uint32_t pkt_len = dp_packet_size(b);
+
+ /* copy multi-seg data */
+ if (b->source == DPBUF_DPDK && !rte_pktmbuf_is_contiguous(&b->mbuf)) {
+ void *dst = NULL;
+ struct rte_mbuf *mbuf = CONST_CAST(struct rte_mbuf *, &b->mbuf);
+
+ new_buffer = dp_packet_new_with_headroom(pkt_len, headroom);
+ dst = dp_packet_data(new_buffer);
+ dp_packet_set_size(new_buffer, pkt_len);
+
+ if (!rte_pktmbuf_read(mbuf, 0, pkt_len, dst)) {
+ dp_packet_delete(new_buffer);
+ return NULL;
+ }
+ } else {
+ new_buffer = dp_packet_clone_data_with_headroom(dp_packet_data(b),
+ dp_packet_size(b),
+ headroom);
+ }
+
+ dp_packet_copy_common_members(new_buffer, b);
+
+ return new_buffer;
+}
+#else
/* Creates and returns a new dp_packet whose data are copied from 'buffer'.
* The returned dp_packet will additionally have 'headroom' bytes of
* headroom. */
struct dp_packet *
-dp_packet_clone_with_headroom(const struct dp_packet *buffer, size_t headroom)
+dp_packet_clone_with_headroom(const struct dp_packet *b, size_t headroom)
{
struct dp_packet *new_buffer;
+ uint32_t pkt_len = dp_packet_size(b);
- new_buffer = dp_packet_clone_data_with_headroom(dp_packet_data(buffer),
- dp_packet_size(buffer),
- headroom);
- /* Copy the following fields into the returned buffer: l2_pad_size,
- * l2_5_ofs, l3_ofs, l4_ofs, cutlen, packet_type and md. */
- memcpy(&new_buffer->l2_pad_size, &buffer->l2_pad_size,
- sizeof(struct dp_packet) -
- offsetof(struct dp_packet, l2_pad_size));
+ new_buffer = dp_packet_clone_data_with_headroom(dp_packet_data(b),
+ pkt_len, headroom);
-#ifdef DPDK_NETDEV
- new_buffer->mbuf.ol_flags = buffer->mbuf.ol_flags;
-#else
- new_buffer->rss_hash_valid = buffer->rss_hash_valid;
-#endif
+ dp_packet_copy_common_members(new_buffer, b);
+ new_buffer->rss_hash_valid = b->rss_hash_valid;
if (dp_packet_rss_valid(new_buffer)) {
-#ifdef DPDK_NETDEV
- new_buffer->mbuf.hash.rss = buffer->mbuf.hash.rss;
-#else
- new_buffer->rss_hash = buffer->rss_hash;
-#endif
+ new_buffer->rss_hash = b->rss_hash;
}
return new_buffer;
}
+#endif
/* Creates and returns a new dp_packet that initially contains a copy of the
* 'size' bytes of data starting at 'data' with no headroom or tailroom. */
diff --git a/lib/dp-packet.h b/lib/dp-packet.h
index 38f11c4..bae1882 100644
--- a/lib/dp-packet.h
+++ b/lib/dp-packet.h
@@ -91,6 +91,9 @@ static inline void dp_packet_set_size(struct dp_packet *, uint32_t);
static inline uint16_t dp_packet_get_allocated(const struct dp_packet *);
static inline void dp_packet_set_allocated(struct dp_packet *, uint16_t);
+static inline void
+dp_packet_copy_mbuf_flags(struct dp_packet *dst, const struct dp_packet *src);
+
void *dp_packet_resize_l2(struct dp_packet *, int increment);
void *dp_packet_resize_l2_5(struct dp_packet *, int increment);
static inline void *dp_packet_eth(const struct dp_packet *);
@@ -119,6 +122,9 @@ void dp_packet_init_dpdk(struct dp_packet *);
void dp_packet_init(struct dp_packet *, size_t);
void dp_packet_uninit(struct dp_packet *);
+void dp_packet_copy_mbuf_flags(struct dp_packet *dst,
+ const struct dp_packet *src);
+
struct dp_packet *dp_packet_new(size_t);
struct dp_packet *dp_packet_new_with_headroom(size_t, size_t headroom);
struct dp_packet *dp_packet_clone(const struct dp_packet *);
@@ -129,6 +135,10 @@ struct dp_packet *dp_packet_clone_data_with_headroom(const void *, size_t,
size_t headroom);
static inline void dp_packet_delete(struct dp_packet *);
+static inline void
+dp_packet_copy_common_members(struct dp_packet *new_b,
+ const struct dp_packet *b);
+
static inline void *dp_packet_at(const struct dp_packet *, size_t offset,
size_t size);
static inline void *dp_packet_at_assert(const struct dp_packet *,
@@ -187,6 +197,17 @@ dp_packet_delete(struct dp_packet *b)
}
}
+/* Copies the following fields into the 'new_b', which represent the common
+ * fields between DPDK and non-DPDK packets: l2_pad_size, l2_5_ofs, l3_ofs,
+ * l4_ofs, cutlen, packet_type and md. */
+static inline void
+dp_packet_copy_common_members(struct dp_packet *new_b,
+ const struct dp_packet *b) {
+ memcpy(&new_b->l2_pad_size, &b->l2_pad_size,
+ sizeof(struct dp_packet) -
+ offsetof(struct dp_packet, l2_pad_size));
+}
+
/* If 'b' contains at least 'offset + size' bytes of data, returns a pointer to
* byte 'offset'. Otherwise, returns a null pointer. */
static inline void *
@@ -680,6 +701,18 @@ dp_packet_set_allocated(struct dp_packet *b, uint16_t s)
{
b->mbuf.buf_len = s;
}
+
+static inline void
+dp_packet_copy_mbuf_flags(struct dp_packet *dst, const struct dp_packet *src)
+{
+ ovs_assert(dst != NULL && src != NULL);
+ struct rte_mbuf *buf_dst = &(dst->mbuf);
+ struct rte_mbuf buf_src = src->mbuf;
+
+ buf_dst->ol_flags = buf_src->ol_flags;
+ buf_dst->packet_type = buf_src->packet_type;
+ buf_dst->tx_offload = buf_src->tx_offload;
+}
#else
static inline bool
dp_packet_equal(const struct dp_packet *a, const struct dp_packet *b)
diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
index f5044ca..d5e70d3 100644
--- a/lib/netdev-dpdk.c
+++ b/lib/netdev-dpdk.c
@@ -2364,6 +2364,7 @@ dpdk_do_tx_copy(struct netdev *netdev, int qid, struct dp_packet_batch *batch)
memcpy(rte_pktmbuf_mtod(pkts[txcnt], void *),
dp_packet_data(packet), size);
dp_packet_set_size((struct dp_packet *)pkts[txcnt], size);
+ dp_packet_copy_mbuf_flags((struct dp_packet *)pkts[txcnt], packet);
txcnt++;
}
--
2.7.4
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