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netvsc: optimize receive completions

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Optimize how receive completion ring are managed.
   * Allocate only as many slots as needed for all buffers from host
   * Allocate before setting up sub channel for better error detection
   * Don't need to keep copy of initial receive section message
   * Precompute the watermark for when receive flushing is needed
   * Replace division with conditional test
   * Replace atomic per-device variable with per-channel check.
   * Handle corner case where receive completion send
     fails if ring buffer to host is full.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger
2017-07-28 08:59:45 -07:00
committed by David S. Miller
parent 02b6de01af
commit 7426b1a518
3 changed files with 127 additions and 176 deletions
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14
drivers/net/hyperv/hyperv_net.h
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@@ -186,6 +186,7 @@ struct net_device_context;
struct netvsc_device *netvsc_device_add(struct hv_device *device,
const struct netvsc_device_info *info);
int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx);
void netvsc_device_remove(struct hv_device *device);
int netvsc_send(struct net_device_context *ndc,
struct hv_netvsc_packet *packet,
@@ -657,13 +658,10 @@ struct recv_comp_data {
u32 status;
};
/* Netvsc Receive Slots Max */
#define NETVSC_RECVSLOT_MAX (NETVSC_RECEIVE_BUFFER_SIZE / ETH_DATA_LEN + 1)
struct multi_recv_comp {
void *buf; /* queued receive completions */
u32 first; /* first data entry */
u32 next; /* next entry for writing */
struct recv_comp_data *slots;
u32 first; /* first data entry */
u32 next; /* next entry for writing */
};
struct netvsc_stats {
@@ -750,7 +748,7 @@ struct netvsc_device {
u32 recv_buf_size;
u32 recv_buf_gpadl_handle;
u32 recv_section_cnt;
struct nvsp_1_receive_buffer_section *recv_section;
u32 recv_completion_cnt;
/* Send buffer allocated by us */
void *send_buf;
@@ -778,8 +776,6 @@ struct netvsc_device {
u32 max_pkt; /* max number of pkt in one send, e.g. 8 */
u32 pkt_align; /* alignment bytes, e.g. 8 */
atomic_t num_outstanding_recvs;
atomic_t open_cnt;
struct netvsc_channel chan_table[VRSS_CHANNEL_MAX];