This commit adds vmxnet3 TSO support.
Verified with test-pmd (set fwd csum) that both tso and
non-tso pkts can be successfully transmitted and all
segmentes for a tso pkt are correct on the receiver side.
Signed-off-by: Yong Wang <yongwang at vmware.com>
---
doc/guides/rel_notes/release_2_3.rst | 3 +
drivers/net/vmxnet3/vmxnet3_rxtx.c | 108 ++++++++++++++++++++++++++---------
2 files changed, 84 insertions(+), 27 deletions(-)
diff --git a/doc/guides/rel_notes/release_2_3.rst
b/doc/guides/rel_notes/release_2_3.rst
index 58205fe..ae487bb 100644
--- a/doc/guides/rel_notes/release_2_3.rst
+++ b/doc/guides/rel_notes/release_2_3.rst
@@ -24,6 +24,9 @@ Drivers
Support TCP/UDP checksum offload.
+* **vmxnet3: add TSO support.**
+
+
Libraries
~~~~~~~~~
diff --git a/drivers/net/vmxnet3/vmxnet3_rxtx.c
b/drivers/net/vmxnet3/vmxnet3_rxtx.c
index 2c1bc3c..103294a 100644
--- a/drivers/net/vmxnet3/vmxnet3_rxtx.c
+++ b/drivers/net/vmxnet3/vmxnet3_rxtx.c
@@ -295,27 +295,45 @@ vmxnet3_dev_clear_queues(struct rte_eth_dev *dev)
}
}
+static int
+vmxnet3_unmap_pkt(uint16_t eop_idx, vmxnet3_tx_queue_t *txq)
+{
+ int completed = 0;
+ struct rte_mbuf *mbuf;
+
+ /* Release cmd_ring descriptor and free mbuf */
+ VMXNET3_ASSERT(txq->cmd_ring.base[eop_idx].txd.eop == 1);
+
+ mbuf = txq->cmd_ring.buf_info[eop_idx].m;
+ if (mbuf == NULL)
+ rte_panic("EOP desc does not point to a valid mbuf");
+ rte_pktmbuf_free(mbuf);
+
+ txq->cmd_ring.buf_info[eop_idx].m = NULL;
+
+ while (txq->cmd_ring.next2comp != eop_idx) {
+ /* no out-of-order completion */
+
VMXNET3_ASSERT(txq->cmd_ring.base[txq->cmd_ring.next2comp].txd.cq == 0);
+ vmxnet3_cmd_ring_adv_next2comp(&txq->cmd_ring);
+ completed++;
+ }
+
+ /* Mark the txd for which tcd was generated as completed */
+ vmxnet3_cmd_ring_adv_next2comp(&txq->cmd_ring);
+
+ return completed + 1;
+}
+
static void
vmxnet3_tq_tx_complete(vmxnet3_tx_queue_t *txq)
{
int completed = 0;
- struct rte_mbuf *mbuf;
vmxnet3_comp_ring_t *comp_ring = &txq->comp_ring;
struct Vmxnet3_TxCompDesc *tcd = (struct Vmxnet3_TxCompDesc *)
(comp_ring->base + comp_ring->next2proc);
while (tcd->gen == comp_ring->gen) {
- /* Release cmd_ring descriptor and free mbuf */
- VMXNET3_ASSERT(txq->cmd_ring.base[tcd->txdIdx].txd.eop == 1);
- while (txq->cmd_ring.next2comp != tcd->txdIdx) {
- mbuf =
txq->cmd_ring.buf_info[txq->cmd_ring.next2comp].m;
- txq->cmd_ring.buf_info[txq->cmd_ring.next2comp].m =
NULL;
- rte_pktmbuf_free_seg(mbuf);
-
- /* Mark the txd for which tcd was generated as
completed */
- vmxnet3_cmd_ring_adv_next2comp(&txq->cmd_ring);
- completed++;
- }
+ completed += vmxnet3_unmap_pkt(tcd->txdIdx, txq);
vmxnet3_comp_ring_adv_next2proc(comp_ring);
tcd = (struct Vmxnet3_TxCompDesc *)(comp_ring->base +
@@ -351,21 +369,43 @@ vmxnet3_xmit_pkts(void *tx_queue, struct rte_mbuf
**tx_pkts,
struct rte_mbuf *txm = tx_pkts[nb_tx];
struct rte_mbuf *m_seg = txm;
int copy_size = 0;
+ bool tso = (txm->ol_flags & PKT_TX_TCP_SEG) != 0;
+ /* # of descriptors needed for a packet. */
+ unsigned count = txm->nb_segs;
- /* Is this packet execessively fragmented, then drop */
- if (unlikely(txm->nb_segs > VMXNET3_MAX_TXD_PER_PKT)) {
- ++txq->stats.drop_too_many_segs;
- ++txq->stats.drop_total;
+ avail = vmxnet3_cmd_ring_desc_avail(&txq->cmd_ring);
+ if (count > avail) {
+ /* Is command ring full? */
+ if (unlikely(avail == 0)) {
+ PMD_TX_LOG(DEBUG, "No free ring descriptors");
+ txq->stats.tx_ring_full++;
+ txq->stats.drop_total += (nb_pkts - nb_tx);
+ break;
+ }
+
+ /* Command ring is not full but cannot handle the
+ * multi-segmented packet. Let's try the next packet
+ * in this case.
+ */
+ PMD_TX_LOG(DEBUG, "Running out of ring descriptors "
+ "(avail %d needed %d)", avail, count);
+ txq->stats.drop_total++;
+ if (tso)
+ txq->stats.drop_tso++;
rte_pktmbuf_free(txm);
- ++nb_tx;
+ nb_tx++;
continue;
}
- /* Is command ring full? */
- avail = vmxnet3_cmd_ring_desc_avail(&txq->cmd_ring);
- if (txm->nb_segs > avail) {
- ++txq->stats.tx_ring_full;
- break;
+ /* Drop non-TSO packet that is excessively fragmented */
+ if (unlikely(!tso && count > VMXNET3_MAX_TXD_PER_PKT)) {
+ PMD_TX_LOG(ERROR, "Non-TSO packet cannot occupy more
than %d tx "
+ "descriptors. Packet dropped.",
VMXNET3_MAX_TXD_PER_PKT);
+ txq->stats.drop_too_many_segs++;
+ txq->stats.drop_total++;
+ rte_pktmbuf_free(txm);
+ nb_tx++;
+ continue;
}
if (txm->nb_segs == 1 && rte_pktmbuf_pkt_len(txm) <=
VMXNET3_HDR_COPY_SIZE) {
@@ -382,11 +422,11 @@ vmxnet3_xmit_pkts(void *tx_queue, struct rte_mbuf
**tx_pkts,
do {
/* Remember the transmit buffer for cleanup */
tbi = txq->cmd_ring.buf_info + txq->cmd_ring.next2fill;
- tbi->m = m_seg;
/* NB: the following assumes that VMXNET3 maximum
- transmit buffer size (16K) is greater than
- maximum sizeof mbuf segment size. */
+ * transmit buffer size (16K) is greater than
+ * maximum size of mbuf segment size.
+ */
gdesc = txq->cmd_ring.base + txq->cmd_ring.next2fill;
if (copy_size)
gdesc->txd.addr =
rte_cpu_to_le_64(txq->data_ring.basePA +
@@ -405,6 +445,8 @@ vmxnet3_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
dw2 = txq->cmd_ring.gen << VMXNET3_TXD_GEN_SHIFT;
} while ((m_seg = m_seg->next) != NULL);
+ /* set the last buf_info for the pkt */
+ tbi->m = txm;
/* Update the EOP descriptor */
gdesc->dword[3] |= VMXNET3_TXD_EOP | VMXNET3_TXD_CQ;
@@ -415,7 +457,17 @@ vmxnet3_xmit_pkts(void *tx_queue, struct rte_mbuf
**tx_pkts,
gdesc->txd.tci = txm->vlan_tci;
}
- if (txm->ol_flags & PKT_TX_L4_MASK) {
+ if (tso) {
+ uint16_t mss = txm->tso_segsz;
+
+ VMXNET3_ASSERT(mss > 0);
+
+ gdesc->txd.hlen = txm->l2_len + txm->l3_len +
txm->l4_len;
+ gdesc->txd.om = VMXNET3_OM_TSO;
+ gdesc->txd.msscof = mss;
+
+ deferred += (rte_pktmbuf_pkt_len(txm) - gdesc->txd.hlen
+ mss - 1) / mss;
+ } else if (txm->ol_flags & PKT_TX_L4_MASK) {
gdesc->txd.om = VMXNET3_OM_CSUM;
gdesc->txd.hlen = txm->l2_len + txm->l3_len;
@@ -431,17 +483,19 @@ vmxnet3_xmit_pkts(void *tx_queue, struct rte_mbuf
**tx_pkts,
txm->ol_flags & PKT_TX_L4_MASK);
abort();
}
+ deferred++;
} else {
gdesc->txd.hlen = 0;
gdesc->txd.om = VMXNET3_OM_NONE;
gdesc->txd.msscof = 0;
+ deferred++;
}
/* flip the GEN bit on the SOP */
rte_compiler_barrier();
gdesc->dword[2] ^= VMXNET3_TXD_GEN;
- txq_ctrl->txNumDeferred = rte_cpu_to_le_32(++deferred);
+ txq_ctrl->txNumDeferred = rte_cpu_to_le_32(deferred);
nb_tx++;
}
--
1.9.1
